From f3eb2131523ba9fccd5ecb69bc2f55a549d30e1a Mon Sep 17 00:00:00 2001 From: qhuang8 Date: Thu, 20 Aug 2009 06:44:42 +0000 Subject: [PATCH] Make end of line consistent for DuetPkg. There is no other update. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9149 6f19259b-4bc3-4df7-8a09-765794883524 --- DuetPkg/BootSector/Mbr.S | 518 ++++---- DuetPkg/BootSector/efi32.S | 8 +- DuetPkg/BootSector/efi64.S | 1510 +++++++++++------------ DuetPkg/BootSector/st16_64.S | 2208 ++++++++++++++++----------------- DuetPkg/BootSector/st32_64.S | 2208 ++++++++++++++++----------------- DuetPkg/BootSector/start.S | 6 +- DuetPkg/BootSector/start16.S | 6 +- DuetPkg/BootSector/start32.S | 8 +- DuetPkg/BootSector/start64.S | 2228 +++++++++++++++++----------------- 9 files changed, 4350 insertions(+), 4350 deletions(-) diff --git a/DuetPkg/BootSector/Mbr.S b/DuetPkg/BootSector/Mbr.S index 74852681f8..a2431e1931 100644 --- a/DuetPkg/BootSector/Mbr.S +++ b/DuetPkg/BootSector/Mbr.S @@ -1,260 +1,260 @@ -#------------------------------------------------------------------------------ -#* -#* Copyright 2006 - 2007, Intel Corporation -#* All rights reserved. This program and the accompanying materials -#* are licensed and made available under the terms and conditions of the BSD License -#* which accompanies this distribution. The full text of the license may be found at -#* http://opensource.org/licenses/bsd-license.php -#* -#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, -#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. -#* -#* Mbr.asm -#* -#* Abstract: -#* -#------------------------------------------------------------------------------ - -.equ BLOCK_SIZE, 0x0200 -.equ BLOCK_MASK, 0x01ff -.equ BLOCK_SHIFT, 9 - -# **************************************************************************** -# Code loaded by BIOS at 0x0000:0x7C00 -# **************************************************************************** - -.org 0x0 - +#------------------------------------------------------------------------------ +#* +#* Copyright 2006 - 2007, Intel Corporation +#* All rights reserved. This program and the accompanying materials +#* are licensed and made available under the terms and conditions of the BSD License +#* which accompanies this distribution. The full text of the license may be found at +#* http://opensource.org/licenses/bsd-license.php +#* +#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +#* +#* Mbr.asm +#* +#* Abstract: +#* +#------------------------------------------------------------------------------ + +.equ BLOCK_SIZE, 0x0200 +.equ BLOCK_MASK, 0x01ff +.equ BLOCK_SHIFT, 9 + +# **************************************************************************** +# Code loaded by BIOS at 0x0000:0x7C00 +# **************************************************************************** + +.org 0x0 + .global _start -_start: - -# **************************************************************************** -# Start Print -# **************************************************************************** - - movw $0xb800, %ax - movw %ax, %es - movw $0x7c0, %ax - movw %ax, %ds - leaw %cs:StartString, %si - movw $10, %cx - movw $160, %di - rep - movsw - -# **************************************************************************** -# Print over -# **************************************************************************** - -# **************************************************************************** -# Initialize segment registers and copy code at 0x0000:0x7c00 to 0x0000:0x0600 -# **************************************************************************** - xorw %ax, %ax # AX = 0x0000 - movw $0x7c00, %bx # BX = 0x7C00 - movw $0x600, %bp # BP = 0x0600 - movw RelocatedStart, %si # SI = Offset(RelocatedStart) - movw $0x200, %cx # CX = 0x0200 - subw %si, %cx # CS = 0x0200 - Offset(RelocatedStart) - leaw (%bp,%si,), %di # DI = 0x0600 + Offset(RelocatedStart) - leaw (%bx,%si,), %si # BX = 0x7C00 + Offset(RelocatedStart) - movw %ax, %ss # SS = 0x0000 - movw %bx, %sp # SP = 0x7C00 - movw %ax, %es # ES = 0x0000 - movw %ax, %ds # DS = 0x0000 - pushw %ax # PUSH 0x0000 - pushw %di # PUSH 0x0600 + Offset(RelocatedStart) - cld # Clear the direction flag - rep - movsb # Copy 0x0200 bytes from 0x7C00 to 0x0600 - retl # JMP 0x0000:0x0600 + Offset(RelocatedStart) - -# **************************************************************************** -# Code relocated to 0x0000:0x0600 -# **************************************************************************** - -RelocatedStart: -# **************************************************************************** -# Get Driver Parameters to 0x0000:0x7BFC -# **************************************************************************** - - xorw %ax, %ax # AX = 0 - movw %ax, %ss # SS = 0 - addw $0x1000, %ax - movw %ax, %ds - - movw $0x7c00, %sp # SP = 0x7c00 - movw %sp, %bp # BP = 0x7c00 - - movb $8, %ah # AH = 8 - Get Drive Parameters Function - movb %dl, PhysicalDrive(%bp) # BBS defines that BIOS would pass the booting driver number to the loader through DL - int $0x13 # Get Drive Parameters - xorw %ax, %ax # AX = 0 - movb %dh, %al # AL = DH - incb %al # MaxHead = AL + 1 - pushw %ax # 0000:7bfe = MaxHead - movb %cl, %al # AL = CL - andb $0x3f, %al # MaxSector = AL & 0x3f - pushw %ax # 0000:7bfc = MaxSector - -# **************************************************************************** -# Read Target DBR from hard disk to 0x0000:0x7C00 -# **************************************************************************** - - xorw %ax, %ax - movb MbrPartitionIndicator(%bp), %al # AX = MbrPartitionIndex - cmpb $0xff, %al # 0xFF means do legacy MBR boot - jnz EfiDbr -LegacyMbr: - movl $0x0000600, %eax # Assume LegacyMBR is backuped in Sector 6 - jmp StartReadTo7C00 # EAX = Header/Sector/Tracker/Zero - -EfiDbr: - cmpb $4, %al # MbrPartitionIndex should < 4 - jae BadDbr - shlw $4, %ax # AX = MBREntrySize * Index - addw $0x1be, %ax # AX = MBREntryOffset - movw %ax, %di # DI = MBREntryOffset - - # Here we don't use the C/H/S information provided by Partition table - # but calculate C/H/S from LBA ourselves - # Ci: Cylinder number - # Hi: Header number - # Si: Sector number - movl %es:8(%bp,%di,), %eax # Start LBA - movl %eax, %edx - shrl $16, %edx # DX:AX = Start LBA - # = Ci * (H * S) + Hi * S + (Si - 1) - - # Calculate C/H/S according to LBA - movw $0x7bfa, %bp - divw 2(%bp) # AX = Hi + H*Ci - # DX = Si - 1 - incw %dx # DX = Si - pushw %dx # 0000:7bfa = Si <---- - xorw %dx, %dx # DX:AX = Hi + H*Ci - divw 4(%bp) # AX = Ci <---- - # DX = Hi <---- - -StartReadTo7C00: - - movb (%bp), %cl # Si - movb %al, %ch # Ci[0-7] - orb %ah, %cl # Ci[8,9] - movw $0x7c00, %bx # ES:BX = 0000:7C00h - movb $0x2, %ah # Function 02h - movb $1, %al # 1 Sector - movb %dl, %dh # Hi - movw $0x600, %bp - movb PhysicalDrive(%bp), %dl # Drive number - int $0x13 - jc BadDbr - - - -# **************************************************************************** -# Transfer control to BootSector - Jump to 0x0000:0x7C00 -# **************************************************************************** - xorw %ax, %ax - pushw %ax # PUSH 0x0000 - Segment - movw $0x7c00, %di - pushw %di # PUSH 0x7C00 - Offset - retl # JMP 0x0000:0x7C00 - -# **************************************************************************** -# ERROR Condition: -# **************************************************************************** - -BadDbr: - pushw %ax - movw $0xb800, %ax - movw %ax, %es - movw $0x60, %ax - movw %ax, %ds - leaw %cs:ErrorString, %si - movw $320, %di - popw %ax - call A2C - movb %ah, 16(%si) - movb %al, 18(%si) - movw $10, %cx - rep - movsw -Halt: - jmp Halt - -StartString: -.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c -ErrorString: -.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, ':', 0x0c, '?', 0x0c, '?', 0x0c - -# **************************************************************************** -# A2C - convert Ascii code stored in AH to character stored in AX -# **************************************************************************** -A2C: - movb %ah, %al - shrb $4, %ah - andb $0xF, %al - addb '0', %ah - addb '0', %al - - cmpb '9', %ah - jle A2C_L1 - addb $7, %ah -A2C_L1: - - cmpb '9', %al - jle A2C_L2 - addb $7, %al -A2C_L2: - ret - - -# **************************************************************************** -# PhysicalDrive - Used to indicate which disk to be boot -# Can be patched by tool -# **************************************************************************** -.org 0x01B6 -PhysicalDrive: .byte 0x80 - -# **************************************************************************** -# MbrPartitionIndicator - Used to indicate which MBR partition to be boot -# Can be patched by tool -# OxFF means boot to legacy MBR. (LBA OFFSET 6) -# **************************************************************************** -.org 0x01B7 -MbrPartitionIndicator: .byte 0 - -# **************************************************************************** -# Unique MBR signature -# **************************************************************************** -.org 0x01B8 - .ascii "DUET" - -# **************************************************************************** -# Unknown -# **************************************************************************** -.org 0x01BC - .word 0 - -# **************************************************************************** -# MBR Entry - To be patched -# **************************************************************************** -.org 0x01BE - .long 0,0,0,0 -.org 0x01CE - .long 0,0,0,0 -.org 0x01DE - .long 0,0,0,0 -.org 0x01EE - .long 0,0,0,0 - -# **************************************************************************** -# Sector Signature -# **************************************************************************** - -.org 0x01FE -SectorSignature: - .word 0xaa55 # Boot Sector Signature - - - +_start: + +# **************************************************************************** +# Start Print +# **************************************************************************** + + movw $0xb800, %ax + movw %ax, %es + movw $0x7c0, %ax + movw %ax, %ds + leaw %cs:StartString, %si + movw $10, %cx + movw $160, %di + rep + movsw + +# **************************************************************************** +# Print over +# **************************************************************************** + +# **************************************************************************** +# Initialize segment registers and copy code at 0x0000:0x7c00 to 0x0000:0x0600 +# **************************************************************************** + xorw %ax, %ax # AX = 0x0000 + movw $0x7c00, %bx # BX = 0x7C00 + movw $0x600, %bp # BP = 0x0600 + movw RelocatedStart, %si # SI = Offset(RelocatedStart) + movw $0x200, %cx # CX = 0x0200 + subw %si, %cx # CS = 0x0200 - Offset(RelocatedStart) + leaw (%bp,%si,), %di # DI = 0x0600 + Offset(RelocatedStart) + leaw (%bx,%si,), %si # BX = 0x7C00 + Offset(RelocatedStart) + movw %ax, %ss # SS = 0x0000 + movw %bx, %sp # SP = 0x7C00 + movw %ax, %es # ES = 0x0000 + movw %ax, %ds # DS = 0x0000 + pushw %ax # PUSH 0x0000 + pushw %di # PUSH 0x0600 + Offset(RelocatedStart) + cld # Clear the direction flag + rep + movsb # Copy 0x0200 bytes from 0x7C00 to 0x0600 + retl # JMP 0x0000:0x0600 + Offset(RelocatedStart) + +# **************************************************************************** +# Code relocated to 0x0000:0x0600 +# **************************************************************************** + +RelocatedStart: +# **************************************************************************** +# Get Driver Parameters to 0x0000:0x7BFC +# **************************************************************************** + + xorw %ax, %ax # AX = 0 + movw %ax, %ss # SS = 0 + addw $0x1000, %ax + movw %ax, %ds + + movw $0x7c00, %sp # SP = 0x7c00 + movw %sp, %bp # BP = 0x7c00 + + movb $8, %ah # AH = 8 - Get Drive Parameters Function + movb %dl, PhysicalDrive(%bp) # BBS defines that BIOS would pass the booting driver number to the loader through DL + int $0x13 # Get Drive Parameters + xorw %ax, %ax # AX = 0 + movb %dh, %al # AL = DH + incb %al # MaxHead = AL + 1 + pushw %ax # 0000:7bfe = MaxHead + movb %cl, %al # AL = CL + andb $0x3f, %al # MaxSector = AL & 0x3f + pushw %ax # 0000:7bfc = MaxSector + +# **************************************************************************** +# Read Target DBR from hard disk to 0x0000:0x7C00 +# **************************************************************************** + + xorw %ax, %ax + movb MbrPartitionIndicator(%bp), %al # AX = MbrPartitionIndex + cmpb $0xff, %al # 0xFF means do legacy MBR boot + jnz EfiDbr +LegacyMbr: + movl $0x0000600, %eax # Assume LegacyMBR is backuped in Sector 6 + jmp StartReadTo7C00 # EAX = Header/Sector/Tracker/Zero + +EfiDbr: + cmpb $4, %al # MbrPartitionIndex should < 4 + jae BadDbr + shlw $4, %ax # AX = MBREntrySize * Index + addw $0x1be, %ax # AX = MBREntryOffset + movw %ax, %di # DI = MBREntryOffset + + # Here we don't use the C/H/S information provided by Partition table + # but calculate C/H/S from LBA ourselves + # Ci: Cylinder number + # Hi: Header number + # Si: Sector number + movl %es:8(%bp,%di,), %eax # Start LBA + movl %eax, %edx + shrl $16, %edx # DX:AX = Start LBA + # = Ci * (H * S) + Hi * S + (Si - 1) + + # Calculate C/H/S according to LBA + movw $0x7bfa, %bp + divw 2(%bp) # AX = Hi + H*Ci + # DX = Si - 1 + incw %dx # DX = Si + pushw %dx # 0000:7bfa = Si <---- + xorw %dx, %dx # DX:AX = Hi + H*Ci + divw 4(%bp) # AX = Ci <---- + # DX = Hi <---- + +StartReadTo7C00: + + movb (%bp), %cl # Si + movb %al, %ch # Ci[0-7] + orb %ah, %cl # Ci[8,9] + movw $0x7c00, %bx # ES:BX = 0000:7C00h + movb $0x2, %ah # Function 02h + movb $1, %al # 1 Sector + movb %dl, %dh # Hi + movw $0x600, %bp + movb PhysicalDrive(%bp), %dl # Drive number + int $0x13 + jc BadDbr + + + +# **************************************************************************** +# Transfer control to BootSector - Jump to 0x0000:0x7C00 +# **************************************************************************** + xorw %ax, %ax + pushw %ax # PUSH 0x0000 - Segment + movw $0x7c00, %di + pushw %di # PUSH 0x7C00 - Offset + retl # JMP 0x0000:0x7C00 + +# **************************************************************************** +# ERROR Condition: +# **************************************************************************** + +BadDbr: + pushw %ax + movw $0xb800, %ax + movw %ax, %es + movw $0x60, %ax + movw %ax, %ds + leaw %cs:ErrorString, %si + movw $320, %di + popw %ax + call A2C + movb %ah, 16(%si) + movb %al, 18(%si) + movw $10, %cx + rep + movsw +Halt: + jmp Halt + +StartString: +.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c +ErrorString: +.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, ':', 0x0c, '?', 0x0c, '?', 0x0c + +# **************************************************************************** +# A2C - convert Ascii code stored in AH to character stored in AX +# **************************************************************************** +A2C: + movb %ah, %al + shrb $4, %ah + andb $0xF, %al + addb '0', %ah + addb '0', %al + + cmpb '9', %ah + jle A2C_L1 + addb $7, %ah +A2C_L1: + + cmpb '9', %al + jle A2C_L2 + addb $7, %al +A2C_L2: + ret + + +# **************************************************************************** +# PhysicalDrive - Used to indicate which disk to be boot +# Can be patched by tool +# **************************************************************************** +.org 0x01B6 +PhysicalDrive: .byte 0x80 + +# **************************************************************************** +# MbrPartitionIndicator - Used to indicate which MBR partition to be boot +# Can be patched by tool +# OxFF means boot to legacy MBR. (LBA OFFSET 6) +# **************************************************************************** +.org 0x01B7 +MbrPartitionIndicator: .byte 0 + +# **************************************************************************** +# Unique MBR signature +# **************************************************************************** +.org 0x01B8 + .ascii "DUET" + +# **************************************************************************** +# Unknown +# **************************************************************************** +.org 0x01BC + .word 0 + +# **************************************************************************** +# MBR Entry - To be patched +# **************************************************************************** +.org 0x01BE + .long 0,0,0,0 +.org 0x01CE + .long 0,0,0,0 +.org 0x01DE + .long 0,0,0,0 +.org 0x01EE + .long 0,0,0,0 + +# **************************************************************************** +# Sector Signature +# **************************************************************************** + +.org 0x01FE +SectorSignature: + .word 0xaa55 # Boot Sector Signature + + + diff --git a/DuetPkg/BootSector/efi32.S b/DuetPkg/BootSector/efi32.S index a017cb1cf6..5ec466c43e 100644 --- a/DuetPkg/BootSector/efi32.S +++ b/DuetPkg/BootSector/efi32.S @@ -19,10 +19,10 @@ # Now in 32-bit protected mode. ############################################################################## - .org 0x21000 - -.global _start -_start: + .org 0x21000 + +.global _start +_start: .equ DEFAULT_HANDLER_SIZE, INT1 - INT0 diff --git a/DuetPkg/BootSector/efi64.S b/DuetPkg/BootSector/efi64.S index b7b3384291..fcf785029f 100644 --- a/DuetPkg/BootSector/efi64.S +++ b/DuetPkg/BootSector/efi64.S @@ -1,732 +1,732 @@ -#------------------------------------------------------------------------------ -#* -#* Copyright 2006, Intel Corporation -#* All rights reserved. This program and the accompanying materials -#* are licensed and made available under the terms and conditions of the BSD License -#* which accompanies this distribution. The full text of the license may be found at -#* http://opensource.org/licenses/bsd-license.php -#* -#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, -#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. -#* -#* efi64.asm -#* -#* Abstract: -#* -#------------------------------------------------------------------------------ - -############################################################################## -# Now in 64-bit long mode. -############################################################################## - - .486: - .stack: - .code: - .org 0x21000 - -.equ DEFAULT_HANDLER_SIZE, INT1 - INT0 - -.macro jmpCommonIdtEntry - # jmp commonIdtEntry - this must be hand coded to keep the assembler from - # using a 8 bit reletive jump when the entries are - # within 255 bytes of the common entry. This must - # be done to maintain the consistency of the size - # of entry points... - .byte 0xe9 # jmp 16 bit relative - .long commonIdtEntry - . - 4 # offset to jump to -.endm - - -Start: - - movl $0x001fffe8,%esp # make final stack aligned - - # set OSFXSR and OSXMMEXCPT because some code will use XMM register - .byte 0xf - .byte 0x20 - .byte 0xe0 -# mov rax, cr4 - btsl $9,%eax - btsl $0xa,%eax - .byte 0xf - .byte 0x22 - .byte 0xe0 -# mov cr4, rax - - call ClearScreen - - # Populate IDT with meaningful offsets for exception handlers... - sidt Idtr - - - movl Halt, %eax - movl %eax,%ebx # use bx to copy 15..0 to descriptors - shrl $16,%eax # use ax to copy 31..16 to descriptors - # 63..32 of descriptors is 0 - movl $0x78,%ecx # 78h IDT entries to initialize with unique entry points (exceptions) - movl (Idtr + 2), %esi - movl (%esi),%edi - -LOOP_1: # loop through all IDT entries exception handlers and initialize to default handler +#------------------------------------------------------------------------------ +#* +#* Copyright 2006, Intel Corporation +#* All rights reserved. This program and the accompanying materials +#* are licensed and made available under the terms and conditions of the BSD License +#* which accompanies this distribution. The full text of the license may be found at +#* http://opensource.org/licenses/bsd-license.php +#* +#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +#* +#* efi64.asm +#* +#* Abstract: +#* +#------------------------------------------------------------------------------ + +############################################################################## +# Now in 64-bit long mode. +############################################################################## + + .486: + .stack: + .code: + .org 0x21000 + +.equ DEFAULT_HANDLER_SIZE, INT1 - INT0 + +.macro jmpCommonIdtEntry + # jmp commonIdtEntry - this must be hand coded to keep the assembler from + # using a 8 bit reletive jump when the entries are + # within 255 bytes of the common entry. This must + # be done to maintain the consistency of the size + # of entry points... + .byte 0xe9 # jmp 16 bit relative + .long commonIdtEntry - . - 4 # offset to jump to +.endm + + +Start: + + movl $0x001fffe8,%esp # make final stack aligned + + # set OSFXSR and OSXMMEXCPT because some code will use XMM register + .byte 0xf + .byte 0x20 + .byte 0xe0 +# mov rax, cr4 + btsl $9,%eax + btsl $0xa,%eax + .byte 0xf + .byte 0x22 + .byte 0xe0 +# mov cr4, rax + + call ClearScreen + + # Populate IDT with meaningful offsets for exception handlers... + sidt Idtr + + + movl Halt, %eax + movl %eax,%ebx # use bx to copy 15..0 to descriptors + shrl $16,%eax # use ax to copy 31..16 to descriptors + # 63..32 of descriptors is 0 + movl $0x78,%ecx # 78h IDT entries to initialize with unique entry points (exceptions) + movl (Idtr + 2), %esi + movl (%esi),%edi + +LOOP_1: # loop through all IDT entries exception handlers and initialize to default handler movw %bx, (%edi) # write bits 15..0 of offset movw $0x38, 2(%edi) # SYS_CODE_SEL64 from GDT movw $(0x0e00 | 0x8000), 4(%edi) # type = 386 interrupt gate, present - movw %ax, 6(%edi) # write bits 31..16 of offset + movw %ax, 6(%edi) # write bits 31..16 of offset movl $0, 8(%edi) # write bits 31..16 of offset addl $16, %edi # move up to next descriptor addw DEFAULT_HANDLER_SIZE, %bx # move to next entry point - loopl LOOP_1 # loop back through again until all descriptors are initialized - - ## at this point edi contains the offset of the descriptor for INT 20 - ## and bx contains the low 16 bits of the offset of the default handler - ## so initialize all the rest of the descriptors with these two values... -# mov ecx, 101 ; there are 100 descriptors left (INT 20 (14h) - INT 119 (77h) -#@@: ; loop through all IDT entries exception handlers and initialize to default handler -# mov word ptr [edi], bx ; write bits 15..0 of offset -# mov word ptr [edi+2], 38h ; SYS_CODE64_SEL from GDT -# mov word ptr [edi+4], 0e00h OR 8000h ; type = 386 interrupt gate, present -# mov word ptr [edi+6], ax ; write bits 31..16 of offset -# mov dword ptr [edi+8], 0 ; write bits 63..32 of offset -# add edi, 16 ; move up to next descriptor -# loop @b ; loop back through again until all descriptors are initialized - - -## DUMP location of IDT and several of the descriptors -# mov ecx, 8 -# mov eax, [offset Idtr + 2] -# mov eax, [eax] -# mov edi, 0b8000h -# call PrintQword -# mov esi, eax -# mov edi, 0b80a0h -# jmp OuterLoop - -## -## just for fun, let's do a software interrupt to see if we correctly land in the exception handler... -# mov eax, 011111111h -# mov ebx, 022222222h -# mov ecx, 033333333h -# mov edx, 044444444h -# mov ebp, 055555555h -# mov esi, 066666666h -# mov edi, 077777777h -# push 011111111h -# push 022222222h -# push 033333333h -# int 119 - - movl $0x22000,%esi # esi = 22000 - movl 0x14(%esi),%eax # eax = [22014] - addl %eax,%esi # esi = 22000 + [22014] = Base of EFILDR.C - movl 0x3c(%esi),%ebp # ebp = [22000 + [22014] + 3c] = NT Image Header for EFILDR.C - addl %esi,%ebp - movl 0x30(%ebp),%edi # edi = [[22000 + [22014] + 3c] + 2c] = ImageBase (63..32 is zero, ignore) - movl 0x28(%ebp),%eax # eax = [[22000 + [22014] + 3c] + 24] = EntryPoint - addl %edi,%eax # eax = ImageBase + EntryPoint - movl %ebx, EfiLdrOffset - movl %eax, (%ebx) # Modify far jump instruction for correct entry point - - movw 6(%ebp), %bx # bx = Number of sections - xorl %eax,%eax - movw 0x14(%ebp), %ax # ax = Optional Header Size - addl %eax,%ebp - addl $0x18,%ebp # ebp = Start of 1st Section - -SectionLoop: - pushl %esi # Save Base of EFILDR.C - pushl %edi # Save ImageBase - addl 0x14(%ebp),%esi # esi = Base of EFILDR.C + PointerToRawData - addl 0x0c(%ebp),%edi # edi = ImageBase + VirtualAddress - movl 0x10(%ebp),%ecx # ecs = SizeOfRawData - - cld - shrl $2,%ecx - rep - movsl - - popl %edi # Restore ImageBase - popl %esi # Restore Base of EFILDR.C - - addw $0x28,%bp # ebp = ebp + 028h = Pointer to next section record - .byte 0x66 - .byte 0xff - .byte 0xcb -# dec bx - cmpw $0,%bx - jne SectionLoop - - movl (Idtr), %eax # get size of IDT - movzx (%edx), %eax - .byte 0xff - .byte 0xc0 -# inc eax - addl 2(%edx), %eax # add to base of IDT to get location of memory map... - xorl %ecx,%ecx - movl %eax,%ecx # put argument to RCX - - .byte 0x48 - .byte 0xc7 - .byte 0xc0 -EfiLdrOffset: - .long 0x00401000 # Offset of EFILDR -# mov rax, 401000h - .byte 0x50 -# push rax - -# ret - .byte 0xc3 - -# db "**** DEFAULT IDT ENTRY ***",0 - .align 0x2 -Halt: -INT0: - pushl $0x0 # push error code place holder on the stack - pushl $0x0 - jmpCommonIdtEntry -# db 0e9h ; jmp 16 bit reletive -# dd commonIdtEntry - $ - 4 ; offset to jump to - -INT1: - pushl $0x0 # push error code place holder on the stack - pushl $0x1 - jmpCommonIdtEntry - -INT2: - pushl $0x0 # push error code place holder on the stack - pushl $0x2 - jmpCommonIdtEntry - -INT3: - pushl $0x0 # push error code place holder on the stack - pushl $0x3 - jmpCommonIdtEntry - -INT4: - pushl $0x0 # push error code place holder on the stack - pushl $0x4 - jmpCommonIdtEntry - -INT5: - pushl $0x0 # push error code place holder on the stack - pushl $0x5 - jmpCommonIdtEntry - -INT6: - pushl $0x0 # push error code place holder on the stack - pushl $0x6 - jmpCommonIdtEntry - -INT7: - pushl $0x0 # push error code place holder on the stack - pushl $0x7 - jmpCommonIdtEntry - -INT8: -# Double fault causes an error code to be pushed so no phony push necessary - nop - nop - pushl $0x8 - jmpCommonIdtEntry - -INT9: - pushl $0x0 # push error code place holder on the stack - pushl $0x9 - jmpCommonIdtEntry - -INT10: -# Invalid TSS causes an error code to be pushed so no phony push necessary - nop - nop - pushl $10 - jmpCommonIdtEntry - -INT11: -# Segment Not Present causes an error code to be pushed so no phony push necessary - nop - nop - pushl $11 - jmpCommonIdtEntry - -INT12: -# Stack fault causes an error code to be pushed so no phony push necessary - nop - nop - pushl $12 - jmpCommonIdtEntry - -INT13: -# GP fault causes an error code to be pushed so no phony push necessary - nop - nop - pushl $13 - jmpCommonIdtEntry - -INT14: -# Page fault causes an error code to be pushed so no phony push necessary - nop - nop - pushl $14 - jmpCommonIdtEntry - -INT15: - pushl $0x0 # push error code place holder on the stack - pushl $15 - jmpCommonIdtEntry - -INT16: - pushl $0x0 # push error code place holder on the stack - pushl $16 - jmpCommonIdtEntry - -INT17: -# Alignment check causes an error code to be pushed so no phony push necessary - nop - nop - pushl $17 - jmpCommonIdtEntry - -INT18: - pushl $0x0 # push error code place holder on the stack - pushl $18 - jmpCommonIdtEntry - -INT19: - pushl $0x0 # push error code place holder on the stack - pushl $19 - jmpCommonIdtEntry - -INTUnknown: -.rept (0x78 - 20) - pushl $0x0 # push error code place holder on the stack -# push xxh ; push vector number - .byte 0x6a - .byte ( . - INTUnknown - 3 ) / 9 + 20 # vector number - jmpCommonIdtEntry -.endr - -commonIdtEntry: - pushl %eax - pushl %ecx - pushl %edx - pushl %ebx - pushl %esp - pushl %ebp - pushl %esi - pushl %edi - .byte 0x41 - .byte 0x50 -# push r8 - .byte 0x41 - .byte 0x51 -# push r9 - .byte 0x41 - .byte 0x52 -# push r10 - .byte 0x41 - .byte 0x53 -# push r11 - .byte 0x41 - .byte 0x54 -# push r12 - .byte 0x41 - .byte 0x55 -# push r13 - .byte 0x41 - .byte 0x56 -# push r14 - .byte 0x41 - .byte 0x57 -# push r15 - .byte 0x48 - movl %esp,%ebp -# mov rbp, rsp - -## -## At this point the stack looks like this: -## -## Calling SS -## Calling RSP -## rflags -## Calling CS -## Calling RIP -## Error code or 0 -## Int num or 0ffh for unknown int num -## rax -## rcx -## rdx -## rbx -## rsp -## rbp -## rsi -## rdi -## r8 -## r9 -## r10 -## r11 -## r12 -## r13 -## r14 -## r15 <------- RSP, RBP -## - - call ClearScreen - mov String1, %esi - call PrintString - .byte 0x48 - movl 16*8(%ebp),%eax ## move Int number into RAX - .byte 0x48 - cmpl $18,%eax - ja PrintDefaultString -PrintExceptionString: - shll $3,%eax ## multiply by 8 to get offset from StringTable to actual string address - addl StringTable, %eax - movl (%eax),%esi - jmp PrintTheString -PrintDefaultString: - movl IntUnknownString, %esi - # patch Int number - movl %eax,%edx - call A2C - movb %al,1(%esi) - movl %edx,%eax - shrl $4,%eax - call A2C - movb %al,(%esi) -PrintTheString: - call PrintString - movl String2, %esi - call PrintString - .byte 0x48 - movl 19*8(%ebp),%eax # CS - call PrintQword - movb $':', %al - movb %al, (%edi) - addl $2,%edi - .byte 0x48 - movl 18*8(%ebp),%eax # RIP - call PrintQword - movl String3, %esi - call PrintString - - movl $0xb8140,%edi - - movl StringRax, %esi - call PrintString - .byte 0x48 - movl 15*8(%ebp),%eax - call PrintQword - - movl StringRcx, %esi - call PrintString - .byte 0x48 - movl 14*8(%ebp),%eax - call PrintQword - - movl StringRdx, %esi - call PrintString - .byte 0x48 - movl 13*8(%ebp),%eax - call PrintQword - - movl $0xb81e0,%edi - - movl StringRbx, %esi - call PrintString - .byte 0x48 - movl 12*8(%ebp),%eax - call PrintQword - - movl StringRsp, %esi - call PrintString - .byte 0x48 - movl 21*8(%ebp),%eax - call PrintQword - - movl StringRbp, %esi - call PrintString - .byte 0x48 - movl 10*8(%ebp),%eax - call PrintQword - - movl $0xb8280,%edi - - movl StringRsi, %esi - call PrintString - .byte 0x48 - movl 9*8(%ebp),%eax - call PrintQword - - movl StringRdi, %esi - call PrintString - .byte 0x48 - movl 8*8(%ebp),%eax - call PrintQword - - movl StringEcode, %esi - call PrintString - .byte 0x48 - movl 17*8(%ebp),%eax - call PrintQword - - movl $0xb8320,%edi - - movl StringR8, %esi - call PrintString - .byte 0x48 - movl 7*8(%ebp),%eax - call PrintQword - - movl StringR9, %esi - call PrintString - .byte 0x48 - movl 6*8(%ebp),%eax - call PrintQword - - movl StringR10, %esi - call PrintString - .byte 0x48 - movl 5*8(%ebp),%eax - call PrintQword - - movl $0xb83c0,%edi - - movl StringR11, %esi - call PrintString - .byte 0x48 - movl 4*8(%ebp),%eax - call PrintQword - - movl StringR12, %esi - call PrintString - .byte 0x48 - movl 3*8(%ebp),%eax - call PrintQword - - movl StringR13, %esi - call PrintString - .byte 0x48 - movl 2*8(%ebp),%eax - call PrintQword - - movl $0xb8460,%edi - - movl StringR14, %esi - call PrintString - .byte 0x48 - movl 1*8(%ebp),%eax - call PrintQword - - movl StringR15, %esi - call PrintString - .byte 0x48 - movl 0*8(%ebp),%eax - call PrintQword - - movl StringSs, %esi - call PrintString - .byte 0x48 - movl 22*8(%ebp),%eax - call PrintQword - - movl $0xb8500,%edi - - movl StringRflags, %esi - call PrintString - .byte 0x48 - movl 20*8(%ebp),%eax - call PrintQword - - movl $0xb8640,%edi - - movl %ebp,%esi - addl $23*8,%esi - movl $4,%ecx - - -OuterLoop: - pushl %ecx - movl $4,%ecx - .byte 0x48 - movl %edi,%edx - -InnerLoop: - .byte 0x48 - movl (%esi),%eax - call PrintQword - addl $8,%esi - mov $0x00, %al - movb %al,(%edi) - addl $2,%edi - loop InnerLoop - - popl %ecx - addl $0xa0,%edx - movl %edx,%edi - loop OuterLoop - - - movl $0xb8960,%edi - - .byte 0x48 - movl 18*8(%ebp),%eax # RIP - subl $8*8,%eax - .byte 0x48 - movl %eax,%esi # esi = rip - 8 QWORD linear (total 16 QWORD) - - movl $4,%ecx - -OuterLoop1: - pushl %ecx - movl $4,%ecx - movl %edi,%edx - -InnerLoop1: - .byte 0x48 - movl (%esi),%eax - call PrintQword - addl $8,%esi - movb $0x00, %al - movb %al,(%edi) - addl $2,%edi - loop InnerLoop1 - - popl %ecx - addl $0xa0,%edx - movl %edx,%edi - loop OuterLoop1 - - - - #wbinvd + loopl LOOP_1 # loop back through again until all descriptors are initialized + + ## at this point edi contains the offset of the descriptor for INT 20 + ## and bx contains the low 16 bits of the offset of the default handler + ## so initialize all the rest of the descriptors with these two values... +# mov ecx, 101 ; there are 100 descriptors left (INT 20 (14h) - INT 119 (77h) +#@@: ; loop through all IDT entries exception handlers and initialize to default handler +# mov word ptr [edi], bx ; write bits 15..0 of offset +# mov word ptr [edi+2], 38h ; SYS_CODE64_SEL from GDT +# mov word ptr [edi+4], 0e00h OR 8000h ; type = 386 interrupt gate, present +# mov word ptr [edi+6], ax ; write bits 31..16 of offset +# mov dword ptr [edi+8], 0 ; write bits 63..32 of offset +# add edi, 16 ; move up to next descriptor +# loop @b ; loop back through again until all descriptors are initialized + + +## DUMP location of IDT and several of the descriptors +# mov ecx, 8 +# mov eax, [offset Idtr + 2] +# mov eax, [eax] +# mov edi, 0b8000h +# call PrintQword +# mov esi, eax +# mov edi, 0b80a0h +# jmp OuterLoop + +## +## just for fun, let's do a software interrupt to see if we correctly land in the exception handler... +# mov eax, 011111111h +# mov ebx, 022222222h +# mov ecx, 033333333h +# mov edx, 044444444h +# mov ebp, 055555555h +# mov esi, 066666666h +# mov edi, 077777777h +# push 011111111h +# push 022222222h +# push 033333333h +# int 119 + + movl $0x22000,%esi # esi = 22000 + movl 0x14(%esi),%eax # eax = [22014] + addl %eax,%esi # esi = 22000 + [22014] = Base of EFILDR.C + movl 0x3c(%esi),%ebp # ebp = [22000 + [22014] + 3c] = NT Image Header for EFILDR.C + addl %esi,%ebp + movl 0x30(%ebp),%edi # edi = [[22000 + [22014] + 3c] + 2c] = ImageBase (63..32 is zero, ignore) + movl 0x28(%ebp),%eax # eax = [[22000 + [22014] + 3c] + 24] = EntryPoint + addl %edi,%eax # eax = ImageBase + EntryPoint + movl %ebx, EfiLdrOffset + movl %eax, (%ebx) # Modify far jump instruction for correct entry point + + movw 6(%ebp), %bx # bx = Number of sections + xorl %eax,%eax + movw 0x14(%ebp), %ax # ax = Optional Header Size + addl %eax,%ebp + addl $0x18,%ebp # ebp = Start of 1st Section + +SectionLoop: + pushl %esi # Save Base of EFILDR.C + pushl %edi # Save ImageBase + addl 0x14(%ebp),%esi # esi = Base of EFILDR.C + PointerToRawData + addl 0x0c(%ebp),%edi # edi = ImageBase + VirtualAddress + movl 0x10(%ebp),%ecx # ecs = SizeOfRawData + + cld + shrl $2,%ecx + rep + movsl + + popl %edi # Restore ImageBase + popl %esi # Restore Base of EFILDR.C + + addw $0x28,%bp # ebp = ebp + 028h = Pointer to next section record + .byte 0x66 + .byte 0xff + .byte 0xcb +# dec bx + cmpw $0,%bx + jne SectionLoop + + movl (Idtr), %eax # get size of IDT + movzx (%edx), %eax + .byte 0xff + .byte 0xc0 +# inc eax + addl 2(%edx), %eax # add to base of IDT to get location of memory map... + xorl %ecx,%ecx + movl %eax,%ecx # put argument to RCX + + .byte 0x48 + .byte 0xc7 + .byte 0xc0 +EfiLdrOffset: + .long 0x00401000 # Offset of EFILDR +# mov rax, 401000h + .byte 0x50 +# push rax + +# ret + .byte 0xc3 + +# db "**** DEFAULT IDT ENTRY ***",0 + .align 0x2 +Halt: +INT0: + pushl $0x0 # push error code place holder on the stack + pushl $0x0 + jmpCommonIdtEntry +# db 0e9h ; jmp 16 bit reletive +# dd commonIdtEntry - $ - 4 ; offset to jump to + +INT1: + pushl $0x0 # push error code place holder on the stack + pushl $0x1 + jmpCommonIdtEntry + +INT2: + pushl $0x0 # push error code place holder on the stack + pushl $0x2 + jmpCommonIdtEntry + +INT3: + pushl $0x0 # push error code place holder on the stack + pushl $0x3 + jmpCommonIdtEntry + +INT4: + pushl $0x0 # push error code place holder on the stack + pushl $0x4 + jmpCommonIdtEntry + +INT5: + pushl $0x0 # push error code place holder on the stack + pushl $0x5 + jmpCommonIdtEntry + +INT6: + pushl $0x0 # push error code place holder on the stack + pushl $0x6 + jmpCommonIdtEntry + +INT7: + pushl $0x0 # push error code place holder on the stack + pushl $0x7 + jmpCommonIdtEntry + +INT8: +# Double fault causes an error code to be pushed so no phony push necessary + nop + nop + pushl $0x8 + jmpCommonIdtEntry + +INT9: + pushl $0x0 # push error code place holder on the stack + pushl $0x9 + jmpCommonIdtEntry + +INT10: +# Invalid TSS causes an error code to be pushed so no phony push necessary + nop + nop + pushl $10 + jmpCommonIdtEntry + +INT11: +# Segment Not Present causes an error code to be pushed so no phony push necessary + nop + nop + pushl $11 + jmpCommonIdtEntry + +INT12: +# Stack fault causes an error code to be pushed so no phony push necessary + nop + nop + pushl $12 + jmpCommonIdtEntry + +INT13: +# GP fault causes an error code to be pushed so no phony push necessary + nop + nop + pushl $13 + jmpCommonIdtEntry + +INT14: +# Page fault causes an error code to be pushed so no phony push necessary + nop + nop + pushl $14 + jmpCommonIdtEntry + +INT15: + pushl $0x0 # push error code place holder on the stack + pushl $15 + jmpCommonIdtEntry + +INT16: + pushl $0x0 # push error code place holder on the stack + pushl $16 + jmpCommonIdtEntry + +INT17: +# Alignment check causes an error code to be pushed so no phony push necessary + nop + nop + pushl $17 + jmpCommonIdtEntry + +INT18: + pushl $0x0 # push error code place holder on the stack + pushl $18 + jmpCommonIdtEntry + +INT19: + pushl $0x0 # push error code place holder on the stack + pushl $19 + jmpCommonIdtEntry + +INTUnknown: +.rept (0x78 - 20) + pushl $0x0 # push error code place holder on the stack +# push xxh ; push vector number + .byte 0x6a + .byte ( . - INTUnknown - 3 ) / 9 + 20 # vector number + jmpCommonIdtEntry +.endr + +commonIdtEntry: + pushl %eax + pushl %ecx + pushl %edx + pushl %ebx + pushl %esp + pushl %ebp + pushl %esi + pushl %edi + .byte 0x41 + .byte 0x50 +# push r8 + .byte 0x41 + .byte 0x51 +# push r9 + .byte 0x41 + .byte 0x52 +# push r10 + .byte 0x41 + .byte 0x53 +# push r11 + .byte 0x41 + .byte 0x54 +# push r12 + .byte 0x41 + .byte 0x55 +# push r13 + .byte 0x41 + .byte 0x56 +# push r14 + .byte 0x41 + .byte 0x57 +# push r15 + .byte 0x48 + movl %esp,%ebp +# mov rbp, rsp + +## +## At this point the stack looks like this: +## +## Calling SS +## Calling RSP +## rflags +## Calling CS +## Calling RIP +## Error code or 0 +## Int num or 0ffh for unknown int num +## rax +## rcx +## rdx +## rbx +## rsp +## rbp +## rsi +## rdi +## r8 +## r9 +## r10 +## r11 +## r12 +## r13 +## r14 +## r15 <------- RSP, RBP +## + + call ClearScreen + mov String1, %esi + call PrintString + .byte 0x48 + movl 16*8(%ebp),%eax ## move Int number into RAX + .byte 0x48 + cmpl $18,%eax + ja PrintDefaultString +PrintExceptionString: + shll $3,%eax ## multiply by 8 to get offset from StringTable to actual string address + addl StringTable, %eax + movl (%eax),%esi + jmp PrintTheString +PrintDefaultString: + movl IntUnknownString, %esi + # patch Int number + movl %eax,%edx + call A2C + movb %al,1(%esi) + movl %edx,%eax + shrl $4,%eax + call A2C + movb %al,(%esi) +PrintTheString: + call PrintString + movl String2, %esi + call PrintString + .byte 0x48 + movl 19*8(%ebp),%eax # CS + call PrintQword + movb $':', %al + movb %al, (%edi) + addl $2,%edi + .byte 0x48 + movl 18*8(%ebp),%eax # RIP + call PrintQword + movl String3, %esi + call PrintString + + movl $0xb8140,%edi + + movl StringRax, %esi + call PrintString + .byte 0x48 + movl 15*8(%ebp),%eax + call PrintQword + + movl StringRcx, %esi + call PrintString + .byte 0x48 + movl 14*8(%ebp),%eax + call PrintQword + + movl StringRdx, %esi + call PrintString + .byte 0x48 + movl 13*8(%ebp),%eax + call PrintQword + + movl $0xb81e0,%edi + + movl StringRbx, %esi + call PrintString + .byte 0x48 + movl 12*8(%ebp),%eax + call PrintQword + + movl StringRsp, %esi + call PrintString + .byte 0x48 + movl 21*8(%ebp),%eax + call PrintQword + + movl StringRbp, %esi + call PrintString + .byte 0x48 + movl 10*8(%ebp),%eax + call PrintQword + + movl $0xb8280,%edi + + movl StringRsi, %esi + call PrintString + .byte 0x48 + movl 9*8(%ebp),%eax + call PrintQword + + movl StringRdi, %esi + call PrintString + .byte 0x48 + movl 8*8(%ebp),%eax + call PrintQword + + movl StringEcode, %esi + call PrintString + .byte 0x48 + movl 17*8(%ebp),%eax + call PrintQword + + movl $0xb8320,%edi + + movl StringR8, %esi + call PrintString + .byte 0x48 + movl 7*8(%ebp),%eax + call PrintQword + + movl StringR9, %esi + call PrintString + .byte 0x48 + movl 6*8(%ebp),%eax + call PrintQword + + movl StringR10, %esi + call PrintString + .byte 0x48 + movl 5*8(%ebp),%eax + call PrintQword + + movl $0xb83c0,%edi + + movl StringR11, %esi + call PrintString + .byte 0x48 + movl 4*8(%ebp),%eax + call PrintQword + + movl StringR12, %esi + call PrintString + .byte 0x48 + movl 3*8(%ebp),%eax + call PrintQword + + movl StringR13, %esi + call PrintString + .byte 0x48 + movl 2*8(%ebp),%eax + call PrintQword + + movl $0xb8460,%edi + + movl StringR14, %esi + call PrintString + .byte 0x48 + movl 1*8(%ebp),%eax + call PrintQword + + movl StringR15, %esi + call PrintString + .byte 0x48 + movl 0*8(%ebp),%eax + call PrintQword + + movl StringSs, %esi + call PrintString + .byte 0x48 + movl 22*8(%ebp),%eax + call PrintQword + + movl $0xb8500,%edi + + movl StringRflags, %esi + call PrintString + .byte 0x48 + movl 20*8(%ebp),%eax + call PrintQword + + movl $0xb8640,%edi + + movl %ebp,%esi + addl $23*8,%esi + movl $4,%ecx + + +OuterLoop: + pushl %ecx + movl $4,%ecx + .byte 0x48 + movl %edi,%edx + +InnerLoop: + .byte 0x48 + movl (%esi),%eax + call PrintQword + addl $8,%esi + mov $0x00, %al + movb %al,(%edi) + addl $2,%edi + loop InnerLoop + + popl %ecx + addl $0xa0,%edx + movl %edx,%edi + loop OuterLoop + + + movl $0xb8960,%edi + + .byte 0x48 + movl 18*8(%ebp),%eax # RIP + subl $8*8,%eax + .byte 0x48 + movl %eax,%esi # esi = rip - 8 QWORD linear (total 16 QWORD) + + movl $4,%ecx + +OuterLoop1: + pushl %ecx + movl $4,%ecx + movl %edi,%edx + +InnerLoop1: + .byte 0x48 + movl (%esi),%eax + call PrintQword + addl $8,%esi + movb $0x00, %al + movb %al,(%edi) + addl $2,%edi + loop InnerLoop1 + + popl %ecx + addl $0xa0,%edx + movl %edx,%edi + loop OuterLoop1 + + + + #wbinvd LN_C1: - jmp LN_C1 - -# -# return -# - movl %ebp,%esp -# mov rsp, rbp - .byte 0x41 - .byte 0x5f -# pop r15 - .byte 0x41 - .byte 0x5e -# pop r14 - .byte 0x41 - .byte 0x5d -# pop r13 - .byte 0x41 - .byte 0x5c -# pop r12 - .byte 0x41 - .byte 0x5b -# pop r11 - .byte 0x41 - .byte 0x5a -# pop r10 - .byte 0x41 - .byte 0x59 -# pop r9 - .byte 0x41 - .byte 0x58 -# pop r8 - popl %edi - popl %esi - popl %ebp - popl %eax # esp - popl %ebx - popl %edx - popl %ecx - popl %eax - - .byte 0x48 - .byte 0x83 - .byte 0xc4 - .byte 0x10 -# add esp, 16 ; error code and INT number - - .byte 0x48 - .byte 0xcf -# iretq - -PrintString: - pushl %eax -LN_C2: - movb (%esi), %al - cmpb $0,%al - je LN_C3 - movb %al, (%edi) - .byte 0xff - .byte 0xc6 -# inc esi - addl $2,%edi - jmp LN_C2 -LN_C3: - popl %eax - ret - -## RAX contains qword to print -## RDI contains memory location (screen location) to print it to -PrintQword: - pushl %ecx - pushl %ebx - pushl %eax - - .byte 0x48 - .byte 0xc7 - .byte 0xc1 - .long 16 -# mov rcx, 16 -looptop: - .byte 0x48 - roll $4,%eax - movb %al,%bl - andb $0xf,%bl - addb $'0', %bl - cmpb $'9', %bl - jle @f - addb $7,%bl -@@: - movb %bl, (%edi) - addl $2,%edi - loop looptop - #wbinvd - - popl %eax - popl %ebx - popl %ecx - ret - -ClearScreen: - pushl %eax - pushl %ecx - - movb $0x00, %al - movb $0xc,%ah - movl $0xb8000,%edi - movl $80*24,%ecx -LN_C4: - movw %ax, (%edi) - addl $2,%edi - loop LN_C4 - movl $0xb8000,%edi - - popl %ecx - popl %eax - - ret - -A2C: - andb $0xf,%al - addb $'0', %al - cmpb $'9', %al - jle @f - addb $7,%al -LN_C5: - ret - -String1: .asciz "*** INT " - + jmp LN_C1 + +# +# return +# + movl %ebp,%esp +# mov rsp, rbp + .byte 0x41 + .byte 0x5f +# pop r15 + .byte 0x41 + .byte 0x5e +# pop r14 + .byte 0x41 + .byte 0x5d +# pop r13 + .byte 0x41 + .byte 0x5c +# pop r12 + .byte 0x41 + .byte 0x5b +# pop r11 + .byte 0x41 + .byte 0x5a +# pop r10 + .byte 0x41 + .byte 0x59 +# pop r9 + .byte 0x41 + .byte 0x58 +# pop r8 + popl %edi + popl %esi + popl %ebp + popl %eax # esp + popl %ebx + popl %edx + popl %ecx + popl %eax + + .byte 0x48 + .byte 0x83 + .byte 0xc4 + .byte 0x10 +# add esp, 16 ; error code and INT number + + .byte 0x48 + .byte 0xcf +# iretq + +PrintString: + pushl %eax +LN_C2: + movb (%esi), %al + cmpb $0,%al + je LN_C3 + movb %al, (%edi) + .byte 0xff + .byte 0xc6 +# inc esi + addl $2,%edi + jmp LN_C2 +LN_C3: + popl %eax + ret + +## RAX contains qword to print +## RDI contains memory location (screen location) to print it to +PrintQword: + pushl %ecx + pushl %ebx + pushl %eax + + .byte 0x48 + .byte 0xc7 + .byte 0xc1 + .long 16 +# mov rcx, 16 +looptop: + .byte 0x48 + roll $4,%eax + movb %al,%bl + andb $0xf,%bl + addb $'0', %bl + cmpb $'9', %bl + jle @f + addb $7,%bl +@@: + movb %bl, (%edi) + addl $2,%edi + loop looptop + #wbinvd + + popl %eax + popl %ebx + popl %ecx + ret + +ClearScreen: + pushl %eax + pushl %ecx + + movb $0x00, %al + movb $0xc,%ah + movl $0xb8000,%edi + movl $80*24,%ecx +LN_C4: + movw %ax, (%edi) + addl $2,%edi + loop LN_C4 + movl $0xb8000,%edi + + popl %ecx + popl %eax + + ret + +A2C: + andb $0xf,%al + addb $'0', %al + cmpb $'9', %al + jle @f + addb $7,%al +LN_C5: + ret + +String1: .asciz "*** INT " + Int0String: .asciz "00h Divide by 0 -" Int1String: .asciz "01h Debug exception -" Int2String: .asciz "02h NMI -" @@ -747,40 +747,40 @@ Int16String: .asciz "10h Floating point error -" Int17String: .asciz "11h Alignment check -" Int18String: .asciz "12h Machine check -" Int19String: .asciz "13h SIMD Floating-Point Exception -" -IntUnknownString: .asciz "??h Unknown interrupt -" - +IntUnknownString: .asciz "??h Unknown interrupt -" + StringTable: .long Int0String, Int1String, Int2String, Int3String, \ Int4String, Int5String, Int6String, Int7String, \ Int8String, Int9String, Int10String, Int11String, \ Int12String, Int13String, Int14String, Int15String,\ - Int16String, Int17String, Int18String, Int19String - -String2: .asciz " HALT!! *** (" -String3: .asciz ")" -StringRax: .asciz "RAX=" -StringRcx: .asciz " RCX=" -StringRdx: .asciz " RDX=" -StringRbx: .asciz "RBX=" -StringRsp: .asciz " RSP=" -StringRbp: .asciz " RBP=" -StringRsi: .asciz "RSI=" -StringRdi: .asciz " RDI=" -StringEcode: .asciz " ECODE=" -StringR8: .asciz "R8 =" -StringR9: .asciz " R9 =" -StringR10: .asciz " R10=" -StringR11: .asciz "R11=" -StringR12: .asciz " R12=" -StringR13: .asciz " R13=" -StringR14: .asciz "R14=" -StringR15: .asciz " R15=" -StringSs: .asciz " SS =" -StringRflags: .asciz "RFLAGS=" - -Idtr: .float 0 - .float 0 - - .org 0x21ffe -BlockSignature: - .word 0xaa55 - + Int16String, Int17String, Int18String, Int19String + +String2: .asciz " HALT!! *** (" +String3: .asciz ")" +StringRax: .asciz "RAX=" +StringRcx: .asciz " RCX=" +StringRdx: .asciz " RDX=" +StringRbx: .asciz "RBX=" +StringRsp: .asciz " RSP=" +StringRbp: .asciz " RBP=" +StringRsi: .asciz "RSI=" +StringRdi: .asciz " RDI=" +StringEcode: .asciz " ECODE=" +StringR8: .asciz "R8 =" +StringR9: .asciz " R9 =" +StringR10: .asciz " R10=" +StringR11: .asciz "R11=" +StringR12: .asciz " R12=" +StringR13: .asciz " R13=" +StringR14: .asciz "R14=" +StringR15: .asciz " R15=" +StringSs: .asciz " SS =" +StringRflags: .asciz "RFLAGS=" + +Idtr: .float 0 + .float 0 + + .org 0x21ffe +BlockSignature: + .word 0xaa55 + diff --git a/DuetPkg/BootSector/st16_64.S b/DuetPkg/BootSector/st16_64.S index ce6864a56d..d9d5d69600 100644 --- a/DuetPkg/BootSector/st16_64.S +++ b/DuetPkg/BootSector/st16_64.S @@ -1,36 +1,36 @@ -#------------------------------------------------------------------------------ -#* -#* Copyright 2006 - 2007, Intel Corporation -#* All rights reserved. This program and the accompanying materials -#* are licensed and made available under the terms and conditions of the BSD License -#* which accompanies this distribution. The full text of the license may be found at -#* http://opensource.org/licenses/bsd-license.php -#* -#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, -#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. -#* -#* st16_64.asm -#* -#* Abstract: -#* -#------------------------------------------------------------------------------ - - - .stack: - .486p: - .code16 - +#------------------------------------------------------------------------------ +#* +#* Copyright 2006 - 2007, Intel Corporation +#* All rights reserved. This program and the accompanying materials +#* are licensed and made available under the terms and conditions of the BSD License +#* which accompanies this distribution. The full text of the license may be found at +#* http://opensource.org/licenses/bsd-license.php +#* +#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +#* +#* st16_64.asm +#* +#* Abstract: +#* +#------------------------------------------------------------------------------ + + + .stack: + .486p: + .code16 + .equ FAT_DIRECTORY_ENTRY_SIZE, 0x020 .equ FAT_DIRECTORY_ENTRY_SHIFT, 5 .equ BLOCK_SIZE, 0x0200 .equ BLOCK_MASK, 0x01ff -.equ BLOCK_SHIFT, 9 - - .org 0x0 -Ia32Jump: - jmp BootSectorEntryPoint # JMP inst - 3 bytes - nop - +.equ BLOCK_SHIFT, 9 + + .org 0x0 +Ia32Jump: + jmp BootSectorEntryPoint # JMP inst - 3 bytes + nop + OemId: .ascii "INTEL " # OemId - 8 bytes SectorSize: .word 0 # Sector Size - 16 bits @@ -51,1089 +51,1089 @@ Signature: .byte 0 # Signature - 8 bits - VolId: .ascii " " # Volume Serial Number- 4 bytes FatLabel: .ascii " " # Label - 11 bytes SystemId: .ascii "FAT16 " # SystemId - 8 bytes - -BootSectorEntryPoint: - # ASSUME ds:@code - # ASSUME ss:@code - # ds = 1000, es = 2000 + x (size of first cluster >> 4) - # cx = Start Cluster of EfiLdr - # dx = Start Cluster of Efivar.bin - -# Re use the BPB data stored in Boot Sector - movw $0x7c00,%bp - - pushw %cx -# Read Efivar.bin -# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already - movw $0x1900,%ax - movw %ax,%es - testw %dx,%dx - jnz CheckVarStoreSize - - movb $1,%al -NoVarStore: - pushw %es -# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl - movb %al, %es:(4) - jmp SaveVolumeId - -CheckVarStoreSize: - movw %dx,%di - cmpl $0x4000, %ds:2(%di) - movb $2,%al - jne NoVarStore - -LoadVarStore: - movb $0,%al + +BootSectorEntryPoint: + # ASSUME ds:@code + # ASSUME ss:@code + # ds = 1000, es = 2000 + x (size of first cluster >> 4) + # cx = Start Cluster of EfiLdr + # dx = Start Cluster of Efivar.bin + +# Re use the BPB data stored in Boot Sector + movw $0x7c00,%bp + + pushw %cx +# Read Efivar.bin +# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already + movw $0x1900,%ax + movw %ax,%es + testw %dx,%dx + jnz CheckVarStoreSize + + movb $1,%al +NoVarStore: + pushw %es +# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl + movb %al, %es:(4) + jmp SaveVolumeId + +CheckVarStoreSize: + movw %dx,%di + cmpl $0x4000, %ds:2(%di) + movb $2,%al + jne NoVarStore + +LoadVarStore: + movb $0,%al movb %al, %es:(4) - movw (%di), %cx -# ES:DI = 1500:0 - xorw %di,%di - pushw %es - movw $0x1500,%ax - movw %ax,%es - call ReadFile -SaveVolumeId: - popw %es + movw (%di), %cx +# ES:DI = 1500:0 + xorw %di,%di + pushw %es + movw $0x1500,%ax + movw %ax,%es + call ReadFile +SaveVolumeId: + popw %es movw VolId(%bp), %ax movw %ax, %es:(0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId movw VolId+2(%bp), %ax - movw %ax, %es:(2) - -# Read Efildr - popw %cx -# cx = Start Cluster of Efildr -> BS.com has filled already -# ES:DI = 2000:0, first cluster will be read again - xorw %di,%di # di = 0 - movw $0x2000,%ax - movw %ax,%es - call ReadFile - movw %cs,%ax - movw %ax, %cs:JumpSegment - -CheckEm64T: - movl $0x80000001,%eax -# cpuid - .word 0xA20F - btl $29,%edx - jc CheckEm64TPass - pushw %cs - popw %ds - leaw Em64String,%si - movw $18,%cx - jmp PrintStringAndHalt -CheckEm64TPass: -jumpFarInstruction: - .byte 0xea -jumpOffset: - .word 0x200 -jumpSegment: - .word 0x2000 - - - -# **************************************************************************** -# ReadFile -# -# Arguments: -# CX = Start Cluster of File -# ES:DI = Buffer to store file content read from disk -# -# Return: -# (ES << 4 + DI) = end of file content Buffer -# -# **************************************************************************** -ReadFile: -# si = NumberOfClusters -# cx = ClusterNumber -# dx = CachedFatSectorNumber -# ds:0000 = CacheFatSectorBuffer -# es:di = Buffer to load file -# bx = NextClusterNumber - pusha - movw $1,%si # NumberOfClusters = 1 - pushw %cx # Push Start Cluster onto stack - movw $0xfff,%dx # CachedFatSectorNumber = 0xfff -FatChainLoop: - movw %cx,%ax # ax = ClusterNumber - andw $0xfff8,%ax # ax = ax & 0xfff8 - cmpw $0xfff8,%ax # See if this is the last cluster - je FoundLastCluster # Jump if last cluster found - movw %cx,%ax # ax = ClusterNumber - shlw %ax # FatOffset = ClusterNumber * 2 - pushw %si # Save si - movw %ax,%si # si = FatOffset - shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT - addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) - andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK - cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber - je SkipFatRead - movw $2,%bx - pushw %es - pushw %ds - popw %es - call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI - popw %es - movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber -SkipFatRead: - movw (%si), %bx # bx = NextClusterNumber - movw %cx,%ax # ax = ClusterNumber - popw %si # Restore si - decw %bx # bx = NextClusterNumber - 1 - cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber - jne ReadClusters - incw %bx # bx = NextClusterNumber - incw %si # NumberOfClusters++ - movw %bx,%cx # ClusterNumber = NextClusterNumber - jmp FatChainLoop -ReadClusters: - incw %bx - popw %ax # ax = StartCluster - pushw %bx # StartCluster = NextClusterNumber - movw %bx,%cx # ClusterNumber = NextClusterNumber - subw $2,%ax # ax = StartCluster - 2 - xorb %bh,%bh - movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster - mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster - addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster - pushw %ax # save start sector - movw %si,%ax # ax = NumberOfClusters - mulw %bx # ax = NumberOfClusters * SectorsPerCluster - movw %ax,%bx # bx = Number of Sectors - popw %ax # ax = Start Sector - call ReadBlocks - movw $1,%si # NumberOfClusters = 1 - jmp FatChainLoop -FoundLastCluster: - popw %cx - popa - ret - - -# **************************************************************************** -# ReadBlocks - Reads a set of blocks from a block device -# -# AX = Start LBA -# BX = Number of Blocks to Read -# ES:DI = Buffer to store sectors read from disk -# **************************************************************************** - -# cx = Blocks -# bx = NumberOfBlocks -# si = StartLBA - -ReadBlocks: - pusha + movw %ax, %es:(2) + +# Read Efildr + popw %cx +# cx = Start Cluster of Efildr -> BS.com has filled already +# ES:DI = 2000:0, first cluster will be read again + xorw %di,%di # di = 0 + movw $0x2000,%ax + movw %ax,%es + call ReadFile + movw %cs,%ax + movw %ax, %cs:JumpSegment + +CheckEm64T: + movl $0x80000001,%eax +# cpuid + .word 0xA20F + btl $29,%edx + jc CheckEm64TPass + pushw %cs + popw %ds + leaw Em64String,%si + movw $18,%cx + jmp PrintStringAndHalt +CheckEm64TPass: +jumpFarInstruction: + .byte 0xea +jumpOffset: + .word 0x200 +jumpSegment: + .word 0x2000 + + + +# **************************************************************************** +# ReadFile +# +# Arguments: +# CX = Start Cluster of File +# ES:DI = Buffer to store file content read from disk +# +# Return: +# (ES << 4 + DI) = end of file content Buffer +# +# **************************************************************************** +ReadFile: +# si = NumberOfClusters +# cx = ClusterNumber +# dx = CachedFatSectorNumber +# ds:0000 = CacheFatSectorBuffer +# es:di = Buffer to load file +# bx = NextClusterNumber + pusha + movw $1,%si # NumberOfClusters = 1 + pushw %cx # Push Start Cluster onto stack + movw $0xfff,%dx # CachedFatSectorNumber = 0xfff +FatChainLoop: + movw %cx,%ax # ax = ClusterNumber + andw $0xfff8,%ax # ax = ax & 0xfff8 + cmpw $0xfff8,%ax # See if this is the last cluster + je FoundLastCluster # Jump if last cluster found + movw %cx,%ax # ax = ClusterNumber + shlw %ax # FatOffset = ClusterNumber * 2 + pushw %si # Save si + movw %ax,%si # si = FatOffset + shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT + addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) + andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK + cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber + je SkipFatRead + movw $2,%bx + pushw %es + pushw %ds + popw %es + call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI + popw %es + movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber +SkipFatRead: + movw (%si), %bx # bx = NextClusterNumber + movw %cx,%ax # ax = ClusterNumber + popw %si # Restore si + decw %bx # bx = NextClusterNumber - 1 + cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber + jne ReadClusters + incw %bx # bx = NextClusterNumber + incw %si # NumberOfClusters++ + movw %bx,%cx # ClusterNumber = NextClusterNumber + jmp FatChainLoop +ReadClusters: + incw %bx + popw %ax # ax = StartCluster + pushw %bx # StartCluster = NextClusterNumber + movw %bx,%cx # ClusterNumber = NextClusterNumber + subw $2,%ax # ax = StartCluster - 2 + xorb %bh,%bh + movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster + mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster + addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster + pushw %ax # save start sector + movw %si,%ax # ax = NumberOfClusters + mulw %bx # ax = NumberOfClusters * SectorsPerCluster + movw %ax,%bx # bx = Number of Sectors + popw %ax # ax = Start Sector + call ReadBlocks + movw $1,%si # NumberOfClusters = 1 + jmp FatChainLoop +FoundLastCluster: + popw %cx + popa + ret + + +# **************************************************************************** +# ReadBlocks - Reads a set of blocks from a block device +# +# AX = Start LBA +# BX = Number of Blocks to Read +# ES:DI = Buffer to store sectors read from disk +# **************************************************************************** + +# cx = Blocks +# bx = NumberOfBlocks +# si = StartLBA + +ReadBlocks: + pusha addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA - addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA - movl %eax,%esi # esi = Start LBA - movw %bx,%cx # cx = Number of blocks to read -ReadCylinderLoop: - movw $0x7bfc,%bp # bp = 0x7bfc - movl %esi,%eax # eax = Start LBA - xorl %edx,%edx # edx = 0 - movzwl (%bp), %ebx # bx = MaxSector - divl %ebx # ax = StartLBA / MaxSector - incw %dx # dx = (StartLBA % MaxSector) + 1 - - movw (%bp), %bx # bx = MaxSector - subw %dx,%bx # bx = MaxSector - Sector - incw %bx # bx = MaxSector - Sector + 1 - cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1) - jg LimitTransfer - movw %cx,%bx # bx = Blocks -LimitTransfer: - pushw %ax # save ax - movw %es,%ax # ax = es - shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system - andw $0x7f,%ax # ax = Number of blocks into current seg - addw %bx,%ax # ax = End Block number of transfer - cmpw $0x80,%ax # See if it crosses a 64K boundry - jle NotCrossing64KBoundry # Branch if not crossing 64K boundry - subw $0x80,%ax # ax = Number of blocks past 64K boundry - subw %ax,%bx # Decrease transfer size by block overage -NotCrossing64KBoundry: - popw %ax # restore ax - - pushw %cx - movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector - xorw %dx,%dx # dx = 0 + addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA + movl %eax,%esi # esi = Start LBA + movw %bx,%cx # cx = Number of blocks to read +ReadCylinderLoop: + movw $0x7bfc,%bp # bp = 0x7bfc + movl %esi,%eax # eax = Start LBA + xorl %edx,%edx # edx = 0 + movzwl (%bp), %ebx # bx = MaxSector + divl %ebx # ax = StartLBA / MaxSector + incw %dx # dx = (StartLBA % MaxSector) + 1 + + movw (%bp), %bx # bx = MaxSector + subw %dx,%bx # bx = MaxSector - Sector + incw %bx # bx = MaxSector - Sector + 1 + cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1) + jg LimitTransfer + movw %cx,%bx # bx = Blocks +LimitTransfer: + pushw %ax # save ax + movw %es,%ax # ax = es + shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system + andw $0x7f,%ax # ax = Number of blocks into current seg + addw %bx,%ax # ax = End Block number of transfer + cmpw $0x80,%ax # See if it crosses a 64K boundry + jle NotCrossing64KBoundry # Branch if not crossing 64K boundry + subw $0x80,%ax # ax = Number of blocks past 64K boundry + subw %ax,%bx # Decrease transfer size by block overage +NotCrossing64KBoundry: + popw %ax # restore ax + + pushw %cx + movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector + xorw %dx,%dx # dx = 0 divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder - # dx = ax % (MaxHead + 1) = Head - - pushw %bx # Save number of blocks to transfer - movb %dl,%dh # dh = Head - movw $0x7c00,%bp # bp = 0x7c00 - movb PhysicalDrive(%bp), %dl # dl = Drive Number - movb %al,%ch # ch = Cylinder - movb %bl,%al # al = Blocks - movb $2,%ah # ah = Function 2 - movw %di,%bx # es:bx = Buffer address - int $0x13 - jc DiskError - popw %bx - popw %cx - movzwl %bx,%ebx - addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks - subw %bx,%cx # Blocks = Blocks - NumberOfBlocks - movw %es,%ax - shlw $(BLOCK_SHIFT-4), %bx - addw %bx,%ax - movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE - cmpw $0,%cx - jne ReadCylinderLoop - popa - ret - -DiskError: - pushw %cs - popw %ds - leaw ErrorString,%si - movw $7,%cx - jmp PrintStringAndHalt - -PrintStringAndHalt: - movw $0xb800,%ax - movw %ax,%es - movw $160,%di - rep - movsw -Halt: - jmp Halt - + # dx = ax % (MaxHead + 1) = Head + + pushw %bx # Save number of blocks to transfer + movb %dl,%dh # dh = Head + movw $0x7c00,%bp # bp = 0x7c00 + movb PhysicalDrive(%bp), %dl # dl = Drive Number + movb %al,%ch # ch = Cylinder + movb %bl,%al # al = Blocks + movb $2,%ah # ah = Function 2 + movw %di,%bx # es:bx = Buffer address + int $0x13 + jc DiskError + popw %bx + popw %cx + movzwl %bx,%ebx + addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks + subw %bx,%cx # Blocks = Blocks - NumberOfBlocks + movw %es,%ax + shlw $(BLOCK_SHIFT-4), %bx + addw %bx,%ax + movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE + cmpw $0,%cx + jne ReadCylinderLoop + popa + ret + +DiskError: + pushw %cs + popw %ds + leaw ErrorString,%si + movw $7,%cx + jmp PrintStringAndHalt + +PrintStringAndHalt: + movw $0xb800,%ax + movw %ax,%es + movw $160,%di + rep + movsw +Halt: + jmp Halt + ErrorString: - .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c - - .org 0x01fa -LBAOffsetForBootSector: - .long 0x0 - - .org 0x01fe - .word 0xaa55 - -#****************************************************************************** -#****************************************************************************** -#****************************************************************************** - -.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay -.equ KBD_CONTROL_PORT, 0x060 # 8042 control port -.equ KBD_STATUS_PORT, 0x064 # 8042 status port -.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port -.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20 - - .org 0x200 - jmp start -Em64String: -.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c - -start: - movw %cs,%ax - movw %ax,%ds - movw %ax,%es - movw %ax,%ss - movw $MyStack, %sp - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[160],'a' -# mov ax,cs -# mov es,ax - - movl $0,%ebx - leal MemoryMap, %edi -MemMapLoop: - movl $0xe820,%eax - movl $20,%ecx - movl $0x534d4150, %edx # SMAP - int $0x15 - jc MemMapDone - addl $20,%edi - cmpl $0,%ebx - je MemMapDone - jmp MemMapLoop -MemMapDone: - leal MemoryMap, %eax - subl %eax,%edi # Get the address of the memory map - movl %edi, MemoryMapSize # Save the size of the memory map - - xorl %ebx,%ebx - movw %cs,%bx # BX=segment - shll $4,%ebx # BX="linear" address of segment base + .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c + + .org 0x01fa +LBAOffsetForBootSector: + .long 0x0 + + .org 0x01fe + .word 0xaa55 + +#****************************************************************************** +#****************************************************************************** +#****************************************************************************** + +.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay +.equ KBD_CONTROL_PORT, 0x060 # 8042 control port +.equ KBD_STATUS_PORT, 0x064 # 8042 status port +.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port +.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20 + + .org 0x200 + jmp start +Em64String: +.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c + +start: + movw %cs,%ax + movw %ax,%ds + movw %ax,%es + movw %ax,%ss + movw $MyStack, %sp + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[160],'a' +# mov ax,cs +# mov es,ax + + movl $0,%ebx + leal MemoryMap, %edi +MemMapLoop: + movl $0xe820,%eax + movl $20,%ecx + movl $0x534d4150, %edx # SMAP + int $0x15 + jc MemMapDone + addl $20,%edi + cmpl $0,%ebx + je MemMapDone + jmp MemMapLoop +MemMapDone: + leal MemoryMap, %eax + subl %eax,%edi # Get the address of the memory map + movl %edi, MemoryMapSize # Save the size of the memory map + + xorl %ebx,%ebx + movw %cs,%bx # BX=segment + shll $4,%ebx # BX="linear" address of segment base leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt movl %eax, (gdtr + 2) # Put address of gdt into the gdtr leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt movl %eax, (idtr + 2) # Put address of idt into the idtr - leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[162],'b' -# mov ax,cs -# mov es,ax - -# -# Enable A20 Gate -# - - movw $0x2401,%ax # Enable A20 Gate - int $0x15 - jnc A20GateEnabled # Jump if it suceeded - -# -# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually. -# - - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - jnz Timeout8042 # Jump if the 8042 timed out - outw %ax, $DELAY_PORT # Delay 1 uS - movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port - outb %al, $KBD_STATUS_PORT # Send command to the 8042 - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - jnz Timeout8042 # Jump if the 8042 timed out - movb $ENABLE_A20_CMD, %al # gate address bit 20 on - outb %al, $KBD_CONTROL_PORT # Send command to thre 8042 - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - movw $25,%cx # Delay 25 uS for the command to complete on the 8042 -Delay25uS: - outw %ax, $DELAY_PORT # Delay 1 uS - loop Delay25uS -Timeout8042: - - -A20GateEnabled: - -# -# DISABLE INTERRUPTS - Entering Protected Mode -# - - cli - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[164],'c' -# mov ax,cs -# mov es,ax - - leal OffsetIn32BitProtectedMode, %eax - addl $0x20000+0x6,%eax - movl %eax, OffsetIn32BitProtectedMode - - leal OffsetInLongMode, %eax - addl $0x20000+0x6,%eax - movl %eax, OffsetInLongMode - - # - # load GDT - # - .byte 0x66 - lgdt gdtr - - # - # Enable Protect Mode (set CR0.PE=1) - # - movl $cr0, %eax # Read CR0. - orl $0x1,%eax # Set PE=1 - movl %eax, %cr0 # Write CR0. - .byte 0x66 - .byte 0xea # jmp far 16:32 -OffsetIn32BitProtectedMode: - .long 0x0000000 # offset $+8 (In32BitProtectedMode) - .word 0x10 # selector (flat CS) -In32BitProtectedMode: - -# -# Entering Long Mode -# - .byte 0x66 - movw $8,%ax - movw %ax,%ds - movw %ax,%es - movw %ax,%ss - - # - # Enable the 64-bit page-translation-table entries by - # setting CR4.PAE=1 (this is _required_ before activating - # long mode). Paging is not enabled until after long mode - # is enabled. - # - .byte 0xf - .byte 0x20 - .byte 0xe0 -# mov eax, cr4 - btsl $5,%eax - .byte 0xf - .byte 0x22 - .byte 0xe0 -# mov cr4, eax - - # - # This is the Trapolean Page Tables that are guarenteed - # under 4GB. - # - # Address Map: - # 10000 ~ 12000 - efildr (loaded) - # 20000 ~ 21000 - start64.com - # 21000 ~ 22000 - efi64.com - # 22000 ~ 90000 - efildr - # 90000 ~ 96000 - 4G pagetable (will be reload later) - # - .byte 0xb8 - .long 0x90000 -# mov eax, 90000h - movl %eax, %cr3 - - # - # Enable long mode (set EFER.LME=1). - # - .byte 0xb9 - .long 0xc0000080 -# mov ecx, 0c0000080h ; EFER MSR number. - .byte 0xf - .byte 0x32 -# rdmsr ; Read EFER. - .byte 0xf - .byte 0xba - .byte 0xe8 - .byte 0x8 -# bts eax, 8 ; Set LME=1. - .byte 0xf - .byte 0x30 -# wrmsr ; Write EFER. - - # - # Enable paging to activate long mode (set CR0.PG=1) - # - movl $cr0, %eax # Read CR0. - .byte 0xf - .byte 0xba - .byte 0xe8 - .byte 0x1f -# bts eax, 31 ; Set PG=1. - movl %eax, %cr0 # Write CR0. - jmp GoToLongMode -GoToLongMode: - - .byte 0x67 - .byte 0xea # Far Jump $+9:Selector to reload CS -OffsetInLongMode: - .long 00000000 # $+9 Offset is ensuing instruction boundary - .word 0x38 # Selector is our code selector, 38h - -InLongMode: - .byte 0x66 - movw $0x30,%ax - movw %ax,%ds - - .byte 0x66 - movw $0x18,%ax - movw %ax,%es - movw %ax,%ss - movw %ax,%ds - - .byte 0xbd - .long 0x400000 -# mov ebp,000400000h ; Destination of EFILDR32 - .byte 0xbb - .long 0x70000 -# mov ebx,000070000h ; Length of copy - - # - # load idt later - # - .byte 0x48 - .byte 0x33 - .byte 0xc0 -# xor rax, rax - .byte 0x66 - movw $idtr, %ax - .byte 0x48 - .byte 0x5 - .long 0x20000 -# add rax, 20000h - - .byte 0xf - .byte 0x1 - .byte 0x18 -# lidt fword ptr [rax] - - .byte 0x48 - .byte 0xc7 - .byte 0xc0 - .long 0x21000 -# mov rax, 21000h - .byte 0x50 -# push rax - -# ret - .byte 0xc3 - -Empty8042InputBuffer: - movw $0,%cx -Empty8042Loop: - outw %ax, $DELAY_PORT # Delay 1us - inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port - andb $0x2,%al # Check the Input Buffer Full Flag - loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS - ret - -############################################################################## -# data -############################################################################## - - .align 0x2 - - gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit - .long 0 # (GDT base gets set above) -############################################################################## -# global descriptor table (GDT) -############################################################################## - - .align 0x2 - -GDT_BASE: -# null descriptor -.equ NULL_SEL, .-GDT_BASE # Selector [0x0] - .word 0 # limit 15:0 - .word 0 # base 15:0 - .byte 0 # base 23:16 - .byte 0 # type - .byte 0 # limit 19:16, flags - .byte 0 # base 31:24 - -# linear data segment descriptor -.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# linear code segment descriptor -.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# system data segment descriptor -.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# system code segment descriptor -.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# spare segment descriptor -.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28] - .word 0 # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0 # present, ring 0, data, expand-up, writable - .byte 0 # page-granular, 32-bit - .byte 0 - -# -# system data segment descriptor -# -.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A - .byte 0xCF # G | D | L | AVL | Segment [19..16] - .byte 0 - -# -# system code segment descriptor -# -.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A - .byte 0xAF # G | D | L | AVL | Segment [19..16] - .byte 0 - -# spare segment descriptor -.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40] - .word 0 # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0 # present, ring 0, data, expand-up, writable - .byte 0 # page-granular, 32-bit - .byte 0 - -GDT_END: - - .align 0x2 - - - -idtr: .long IDT_END - IDT_BASE - 1 # IDT limit - .quad 0 # (IDT base gets set above) - -############################################################################## -# interrupt descriptor table (IDT) -# -# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ -# mappings. This implementation only uses the system timer and all other -# IRQs will remain masked. The descriptors for vectors 33+ are provided -# for convenience. -############################################################################## - -#idt_tag db "IDT",0 - .align 0x2 - - -IDT_BASE: -# divide by zero (INT 0) -.equ DIV_ZERO_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# debug exception (INT 1) -.equ DEBUG_EXCEPT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# NMI (INT 2) -.equ NMI_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# soft breakpoint (INT 3) -.equ BREAKPOINT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# overflow (INT 4) -.equ OVERFLOW_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# bounds check (INT 5) -.equ BOUNDS_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# invalid opcode (INT 6) -.equ INVALID_OPCODE_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# device not available (INT 7) -.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# double fault (INT 8) -.equ DOUBLE_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Coprocessor segment overrun - reserved (INT 9) -.equ RSVD_INTR_SEL1, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# invalid TSS (INT 0ah) -.equ INVALID_TSS_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# segment not present (INT 0bh) -.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# stack fault (INT 0ch) -.equ STACK_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# general protection (INT 0dh) -.equ GP_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# page fault (INT 0eh) -.equ PAGE_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Intel reserved - do not use (INT 0fh) -.equ RSVD_INTR_SEL2, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# floating point error (INT 10h) -.equ FLT_POINT_ERR_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# alignment check (INT 11h) -.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# machine check (INT 12h) -.equ MACHINE_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# SIMD floating-point exception (INT 13h) -.equ SIMD_EXCEPTION_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail - .fill 85 * 16, 1, 0 # db (85 * 16) dup(0) - -# IRQ 0 (System timer) - (INT 68h) -.equ IRQ0_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 1 (8042 Keyboard controller) - (INT 69h) -.equ IRQ1_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) -.equ IRQ2_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 3 (COM 2) - (INT 6bh) -.equ IRQ3_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 4 (COM 1) - (INT 6ch) -.equ IRQ4_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 5 (LPT 2) - (INT 6dh) -.equ IRQ5_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 6 (Floppy controller) - (INT 6eh) -.equ IRQ6_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 7 (LPT 1) - (INT 6fh) -.equ IRQ7_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 8 (RTC Alarm) - (INT 70h) -.equ IRQ8_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 9 - (INT 71h) -.equ IRQ9_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 10 - (INT 72h) -.equ IRQ10_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 11 - (INT 73h) -.equ IRQ11_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 12 (PS/2 mouse) - (INT 74h) -.equ IRQ12_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 13 (Floating point error) - (INT 75h) -.equ IRQ13_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 14 (Secondary IDE) - (INT 76h) -.equ IRQ14_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 15 (Primary IDE) - (INT 77h) -.equ IRQ15_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -IDT_END: - - .align 0x2 - -MemoryMapSize: .long 0 -MemoryMap: .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - - .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 - - #.org 0x0fe0 #Just for pass build -MyStack: - # below is the pieces of the IVT that is used to redirect INT 68h - 6fh - # back to INT 08h - 0fh when in real mode... It is 'org'ed to a - # known low address (20f00) so it can be set up by PlMapIrqToVect in - # 8259.c - - int $8 - iret - - int $9 - iret - - int $10 - iret - - int $11 - iret - - int $12 - iret - - int $13 - iret - - int $14 - iret - - int $15 - iret - - - #.org 0x0ffe #Just for pass build -BlockSignature: - .word 0xaa55 - + leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[162],'b' +# mov ax,cs +# mov es,ax + +# +# Enable A20 Gate +# + + movw $0x2401,%ax # Enable A20 Gate + int $0x15 + jnc A20GateEnabled # Jump if it suceeded + +# +# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually. +# + + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + jnz Timeout8042 # Jump if the 8042 timed out + outw %ax, $DELAY_PORT # Delay 1 uS + movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port + outb %al, $KBD_STATUS_PORT # Send command to the 8042 + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + jnz Timeout8042 # Jump if the 8042 timed out + movb $ENABLE_A20_CMD, %al # gate address bit 20 on + outb %al, $KBD_CONTROL_PORT # Send command to thre 8042 + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + movw $25,%cx # Delay 25 uS for the command to complete on the 8042 +Delay25uS: + outw %ax, $DELAY_PORT # Delay 1 uS + loop Delay25uS +Timeout8042: + + +A20GateEnabled: + +# +# DISABLE INTERRUPTS - Entering Protected Mode +# + + cli + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[164],'c' +# mov ax,cs +# mov es,ax + + leal OffsetIn32BitProtectedMode, %eax + addl $0x20000+0x6,%eax + movl %eax, OffsetIn32BitProtectedMode + + leal OffsetInLongMode, %eax + addl $0x20000+0x6,%eax + movl %eax, OffsetInLongMode + + # + # load GDT + # + .byte 0x66 + lgdt gdtr + + # + # Enable Protect Mode (set CR0.PE=1) + # + movl $cr0, %eax # Read CR0. + orl $0x1,%eax # Set PE=1 + movl %eax, %cr0 # Write CR0. + .byte 0x66 + .byte 0xea # jmp far 16:32 +OffsetIn32BitProtectedMode: + .long 0x0000000 # offset $+8 (In32BitProtectedMode) + .word 0x10 # selector (flat CS) +In32BitProtectedMode: + +# +# Entering Long Mode +# + .byte 0x66 + movw $8,%ax + movw %ax,%ds + movw %ax,%es + movw %ax,%ss + + # + # Enable the 64-bit page-translation-table entries by + # setting CR4.PAE=1 (this is _required_ before activating + # long mode). Paging is not enabled until after long mode + # is enabled. + # + .byte 0xf + .byte 0x20 + .byte 0xe0 +# mov eax, cr4 + btsl $5,%eax + .byte 0xf + .byte 0x22 + .byte 0xe0 +# mov cr4, eax + + # + # This is the Trapolean Page Tables that are guarenteed + # under 4GB. + # + # Address Map: + # 10000 ~ 12000 - efildr (loaded) + # 20000 ~ 21000 - start64.com + # 21000 ~ 22000 - efi64.com + # 22000 ~ 90000 - efildr + # 90000 ~ 96000 - 4G pagetable (will be reload later) + # + .byte 0xb8 + .long 0x90000 +# mov eax, 90000h + movl %eax, %cr3 + + # + # Enable long mode (set EFER.LME=1). + # + .byte 0xb9 + .long 0xc0000080 +# mov ecx, 0c0000080h ; EFER MSR number. + .byte 0xf + .byte 0x32 +# rdmsr ; Read EFER. + .byte 0xf + .byte 0xba + .byte 0xe8 + .byte 0x8 +# bts eax, 8 ; Set LME=1. + .byte 0xf + .byte 0x30 +# wrmsr ; Write EFER. + + # + # Enable paging to activate long mode (set CR0.PG=1) + # + movl $cr0, %eax # Read CR0. + .byte 0xf + .byte 0xba + .byte 0xe8 + .byte 0x1f +# bts eax, 31 ; Set PG=1. + movl %eax, %cr0 # Write CR0. + jmp GoToLongMode +GoToLongMode: + + .byte 0x67 + .byte 0xea # Far Jump $+9:Selector to reload CS +OffsetInLongMode: + .long 00000000 # $+9 Offset is ensuing instruction boundary + .word 0x38 # Selector is our code selector, 38h + +InLongMode: + .byte 0x66 + movw $0x30,%ax + movw %ax,%ds + + .byte 0x66 + movw $0x18,%ax + movw %ax,%es + movw %ax,%ss + movw %ax,%ds + + .byte 0xbd + .long 0x400000 +# mov ebp,000400000h ; Destination of EFILDR32 + .byte 0xbb + .long 0x70000 +# mov ebx,000070000h ; Length of copy + + # + # load idt later + # + .byte 0x48 + .byte 0x33 + .byte 0xc0 +# xor rax, rax + .byte 0x66 + movw $idtr, %ax + .byte 0x48 + .byte 0x5 + .long 0x20000 +# add rax, 20000h + + .byte 0xf + .byte 0x1 + .byte 0x18 +# lidt fword ptr [rax] + + .byte 0x48 + .byte 0xc7 + .byte 0xc0 + .long 0x21000 +# mov rax, 21000h + .byte 0x50 +# push rax + +# ret + .byte 0xc3 + +Empty8042InputBuffer: + movw $0,%cx +Empty8042Loop: + outw %ax, $DELAY_PORT # Delay 1us + inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port + andb $0x2,%al # Check the Input Buffer Full Flag + loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS + ret + +############################################################################## +# data +############################################################################## + + .align 0x2 + + gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit + .long 0 # (GDT base gets set above) +############################################################################## +# global descriptor table (GDT) +############################################################################## + + .align 0x2 + +GDT_BASE: +# null descriptor +.equ NULL_SEL, .-GDT_BASE # Selector [0x0] + .word 0 # limit 15:0 + .word 0 # base 15:0 + .byte 0 # base 23:16 + .byte 0 # type + .byte 0 # limit 19:16, flags + .byte 0 # base 31:24 + +# linear data segment descriptor +.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# linear code segment descriptor +.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# system data segment descriptor +.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# system code segment descriptor +.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# spare segment descriptor +.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28] + .word 0 # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0 # present, ring 0, data, expand-up, writable + .byte 0 # page-granular, 32-bit + .byte 0 + +# +# system data segment descriptor +# +.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A + .byte 0xCF # G | D | L | AVL | Segment [19..16] + .byte 0 + +# +# system code segment descriptor +# +.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A + .byte 0xAF # G | D | L | AVL | Segment [19..16] + .byte 0 + +# spare segment descriptor +.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40] + .word 0 # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0 # present, ring 0, data, expand-up, writable + .byte 0 # page-granular, 32-bit + .byte 0 + +GDT_END: + + .align 0x2 + + + +idtr: .long IDT_END - IDT_BASE - 1 # IDT limit + .quad 0 # (IDT base gets set above) + +############################################################################## +# interrupt descriptor table (IDT) +# +# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ +# mappings. This implementation only uses the system timer and all other +# IRQs will remain masked. The descriptors for vectors 33+ are provided +# for convenience. +############################################################################## + +#idt_tag db "IDT",0 + .align 0x2 + + +IDT_BASE: +# divide by zero (INT 0) +.equ DIV_ZERO_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# debug exception (INT 1) +.equ DEBUG_EXCEPT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# NMI (INT 2) +.equ NMI_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# soft breakpoint (INT 3) +.equ BREAKPOINT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# overflow (INT 4) +.equ OVERFLOW_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# bounds check (INT 5) +.equ BOUNDS_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# invalid opcode (INT 6) +.equ INVALID_OPCODE_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# device not available (INT 7) +.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# double fault (INT 8) +.equ DOUBLE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Coprocessor segment overrun - reserved (INT 9) +.equ RSVD_INTR_SEL1, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# invalid TSS (INT 0ah) +.equ INVALID_TSS_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# segment not present (INT 0bh) +.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# stack fault (INT 0ch) +.equ STACK_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# general protection (INT 0dh) +.equ GP_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# page fault (INT 0eh) +.equ PAGE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Intel reserved - do not use (INT 0fh) +.equ RSVD_INTR_SEL2, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# floating point error (INT 10h) +.equ FLT_POINT_ERR_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# alignment check (INT 11h) +.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# machine check (INT 12h) +.equ MACHINE_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# SIMD floating-point exception (INT 13h) +.equ SIMD_EXCEPTION_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail + .fill 85 * 16, 1, 0 # db (85 * 16) dup(0) + +# IRQ 0 (System timer) - (INT 68h) +.equ IRQ0_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 1 (8042 Keyboard controller) - (INT 69h) +.equ IRQ1_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) +.equ IRQ2_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 3 (COM 2) - (INT 6bh) +.equ IRQ3_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 4 (COM 1) - (INT 6ch) +.equ IRQ4_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 5 (LPT 2) - (INT 6dh) +.equ IRQ5_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 6 (Floppy controller) - (INT 6eh) +.equ IRQ6_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 7 (LPT 1) - (INT 6fh) +.equ IRQ7_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 8 (RTC Alarm) - (INT 70h) +.equ IRQ8_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 9 - (INT 71h) +.equ IRQ9_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 10 - (INT 72h) +.equ IRQ10_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 11 - (INT 73h) +.equ IRQ11_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 12 (PS/2 mouse) - (INT 74h) +.equ IRQ12_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 13 (Floating point error) - (INT 75h) +.equ IRQ13_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 14 (Secondary IDE) - (INT 76h) +.equ IRQ14_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 15 (Primary IDE) - (INT 77h) +.equ IRQ15_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +IDT_END: + + .align 0x2 + +MemoryMapSize: .long 0 +MemoryMap: .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + + .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 + + #.org 0x0fe0 #Just for pass build +MyStack: + # below is the pieces of the IVT that is used to redirect INT 68h - 6fh + # back to INT 08h - 0fh when in real mode... It is 'org'ed to a + # known low address (20f00) so it can be set up by PlMapIrqToVect in + # 8259.c + + int $8 + iret + + int $9 + iret + + int $10 + iret + + int $11 + iret + + int $12 + iret + + int $13 + iret + + int $14 + iret + + int $15 + iret + + + #.org 0x0ffe #Just for pass build +BlockSignature: + .word 0xaa55 + diff --git a/DuetPkg/BootSector/st32_64.S b/DuetPkg/BootSector/st32_64.S index bcab620562..6756a663db 100644 --- a/DuetPkg/BootSector/st32_64.S +++ b/DuetPkg/BootSector/st32_64.S @@ -1,36 +1,36 @@ -#------------------------------------------------------------------------------ -#* -#* Copyright 2006 - 2007, Intel Corporation -#* All rights reserved. This program and the accompanying materials -#* are licensed and made available under the terms and conditions of the BSD License -#* which accompanies this distribution. The full text of the license may be found at -#* http://opensource.org/licenses/bsd-license.php -#* -#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, -#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. -#* -#* st32_64.asm -#* -#* Abstract: -#* -#------------------------------------------------------------------------------ - - - .stack: - .486p: - .code16 - +#------------------------------------------------------------------------------ +#* +#* Copyright 2006 - 2007, Intel Corporation +#* All rights reserved. This program and the accompanying materials +#* are licensed and made available under the terms and conditions of the BSD License +#* which accompanies this distribution. The full text of the license may be found at +#* http://opensource.org/licenses/bsd-license.php +#* +#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +#* +#* st32_64.asm +#* +#* Abstract: +#* +#------------------------------------------------------------------------------ + + + .stack: + .486p: + .code16 + .equ FAT_DIRECTORY_ENTRY_SIZE, 0x020 .equ FAT_DIRECTORY_ENTRY_SHIFT, 5 .equ BLOCK_SIZE, 0x0200 .equ BLOCK_MASK, 0x01ff -.equ BLOCK_SHIFT, 9 - - .org 0x0 -Ia32Jump: - jmp BootSectorEntryPoint # JMP inst - 3 bytes - nop - +.equ BLOCK_SHIFT, 9 + + .org 0x0 +Ia32Jump: + jmp BootSectorEntryPoint # JMP inst - 3 bytes + nop + OemId: .ascii "INTEL " # OemId - 8 bytes SectorSize: .word 0 # Sector Size - 2 bytes SectorsPerCluster: .byte 0 # Sector Per Cluster - 1 byte @@ -66,1089 +66,1089 @@ VolId: .ascii " " # Volume Serial Number - 4 FatLabel: .ascii " " # Volume Label - 11 bytes FileSystemType: .ascii "FAT32 " # File System Type - 8 bytes - -BootSectorEntryPoint: - # ASSUME ds:@code - # ASSUME ss:@code - # ds = 1000, es = 2000 + x (size of first cluster >> 4) - # cx = Start Cluster of EfiLdr - # dx = Start Cluster of Efivar.bin - -# Re use the BPB data stored in Boot Sector - movw $0x7c00,%bp - - pushw %cx -# Read Efivar.bin -# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already - movw $0x1900,%ax - movw %ax,%es - testw %dx,%dx - jnz CheckVarStoreSize - - movb $1,%al -NoVarStore: - pushw %es -# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl - movb %al, %es:(4) - jmp SaveVolumeId - -CheckVarStoreSize: - movw %dx,%di - cmpl $0x4000, %ds:2(%di) - movb $2,%al - jne NoVarStore - -LoadVarStore: - movb $0,%al + +BootSectorEntryPoint: + # ASSUME ds:@code + # ASSUME ss:@code + # ds = 1000, es = 2000 + x (size of first cluster >> 4) + # cx = Start Cluster of EfiLdr + # dx = Start Cluster of Efivar.bin + +# Re use the BPB data stored in Boot Sector + movw $0x7c00,%bp + + pushw %cx +# Read Efivar.bin +# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already + movw $0x1900,%ax + movw %ax,%es + testw %dx,%dx + jnz CheckVarStoreSize + + movb $1,%al +NoVarStore: + pushw %es +# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl + movb %al, %es:(4) + jmp SaveVolumeId + +CheckVarStoreSize: + movw %dx,%di + cmpl $0x4000, %ds:2(%di) + movb $2,%al + jne NoVarStore + +LoadVarStore: + movb $0,%al movb %al, %es:(4) - movw (%di), %cx -# ES:DI = 1500:0 - xorw %di,%di - pushw %es - movw $0x1500,%ax - movw %ax,%es - call ReadFile -SaveVolumeId: - popw %es + movw (%di), %cx +# ES:DI = 1500:0 + xorw %di,%di + pushw %es + movw $0x1500,%ax + movw %ax,%es + call ReadFile +SaveVolumeId: + popw %es movw VolId(%bp), %ax movw %ax, %es:(0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId movw VolId+2(%bp), %ax - movw %ax, %es:(2) - -# Read Efildr - popw %cx -# cx = Start Cluster of Efildr -> BS.com has filled already -# ES:DI = 2000:0, first cluster will be read again - xorw %di,%di # di = 0 - movw $0x2000,%ax - movw %ax,%es - call ReadFile - movw %cs,%ax - movw %ax, %cs:JumpSegment - -CheckEm64T: - movl $0x80000001,%eax -# cpuid - .word 0xA20F - btl $29,%edx - jc CheckEm64TPass - pushw %cs - popw %ds - leaw Em64String,%si - movw $18,%cx - jmp PrintStringAndHalt -CheckEm64TPass: -jumpFarInstruction: - .byte 0xea -jumpOffset: - .word 0x200 -jumpSegment: - .word 0x2000 - - - -# **************************************************************************** -# ReadFile -# -# Arguments: -# CX = Start Cluster of File -# ES:DI = Buffer to store file content read from disk -# -# Return: -# (ES << 4 + DI) = end of file content Buffer -# -# **************************************************************************** -ReadFile: -# si = NumberOfClusters -# cx = ClusterNumber -# dx = CachedFatSectorNumber -# ds:0000 = CacheFatSectorBuffer -# es:di = Buffer to load file -# bx = NextClusterNumber - pusha - movw $1,%si # NumberOfClusters = 1 - pushw %cx # Push Start Cluster onto stack - movw $0xfff,%dx # CachedFatSectorNumber = 0xfff -FatChainLoop: - movw %cx,%ax # ax = ClusterNumber - andw $0xfff8,%ax # ax = ax & 0xfff8 - cmpw $0xfff8,%ax # See if this is the last cluster - je FoundLastCluster # Jump if last cluster found - movw %cx,%ax # ax = ClusterNumber - shlw $2, %ax # FatOffset = ClusterNumber * 2 - pushw %si # Save si - movw %ax,%si # si = FatOffset - shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT - addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) - andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK - cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber - je SkipFatRead - movw $2,%bx - pushw %es - pushw %ds - popw %es - call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI - popw %es - movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber -SkipFatRead: - movw (%si), %bx # bx = NextClusterNumber - movw %cx,%ax # ax = ClusterNumber - popw %si # Restore si - decw %bx # bx = NextClusterNumber - 1 - cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber - jne ReadClusters - incw %bx # bx = NextClusterNumber - incw %si # NumberOfClusters++ - movw %bx,%cx # ClusterNumber = NextClusterNumber - jmp FatChainLoop -ReadClusters: - incw %bx - popw %ax # ax = StartCluster - pushw %bx # StartCluster = NextClusterNumber - movw %bx,%cx # ClusterNumber = NextClusterNumber - subw $2,%ax # ax = StartCluster - 2 - xorb %bh,%bh - movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster - mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster - addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster - pushw %ax # save start sector - movw %si,%ax # ax = NumberOfClusters - mulw %bx # ax = NumberOfClusters * SectorsPerCluster - movw %ax,%bx # bx = Number of Sectors - popw %ax # ax = Start Sector - call ReadBlocks - movw $1,%si # NumberOfClusters = 1 - jmp FatChainLoop -FoundLastCluster: - popw %cx - popa - ret - - -# **************************************************************************** -# ReadBlocks - Reads a set of blocks from a block device -# -# AX = Start LBA -# BX = Number of Blocks to Read -# ES:DI = Buffer to store sectors read from disk -# **************************************************************************** - -# cx = Blocks -# bx = NumberOfBlocks -# si = StartLBA - -ReadBlocks: - pusha + movw %ax, %es:(2) + +# Read Efildr + popw %cx +# cx = Start Cluster of Efildr -> BS.com has filled already +# ES:DI = 2000:0, first cluster will be read again + xorw %di,%di # di = 0 + movw $0x2000,%ax + movw %ax,%es + call ReadFile + movw %cs,%ax + movw %ax, %cs:JumpSegment + +CheckEm64T: + movl $0x80000001,%eax +# cpuid + .word 0xA20F + btl $29,%edx + jc CheckEm64TPass + pushw %cs + popw %ds + leaw Em64String,%si + movw $18,%cx + jmp PrintStringAndHalt +CheckEm64TPass: +jumpFarInstruction: + .byte 0xea +jumpOffset: + .word 0x200 +jumpSegment: + .word 0x2000 + + + +# **************************************************************************** +# ReadFile +# +# Arguments: +# CX = Start Cluster of File +# ES:DI = Buffer to store file content read from disk +# +# Return: +# (ES << 4 + DI) = end of file content Buffer +# +# **************************************************************************** +ReadFile: +# si = NumberOfClusters +# cx = ClusterNumber +# dx = CachedFatSectorNumber +# ds:0000 = CacheFatSectorBuffer +# es:di = Buffer to load file +# bx = NextClusterNumber + pusha + movw $1,%si # NumberOfClusters = 1 + pushw %cx # Push Start Cluster onto stack + movw $0xfff,%dx # CachedFatSectorNumber = 0xfff +FatChainLoop: + movw %cx,%ax # ax = ClusterNumber + andw $0xfff8,%ax # ax = ax & 0xfff8 + cmpw $0xfff8,%ax # See if this is the last cluster + je FoundLastCluster # Jump if last cluster found + movw %cx,%ax # ax = ClusterNumber + shlw $2, %ax # FatOffset = ClusterNumber * 2 + pushw %si # Save si + movw %ax,%si # si = FatOffset + shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT + addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) + andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK + cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber + je SkipFatRead + movw $2,%bx + pushw %es + pushw %ds + popw %es + call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI + popw %es + movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber +SkipFatRead: + movw (%si), %bx # bx = NextClusterNumber + movw %cx,%ax # ax = ClusterNumber + popw %si # Restore si + decw %bx # bx = NextClusterNumber - 1 + cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber + jne ReadClusters + incw %bx # bx = NextClusterNumber + incw %si # NumberOfClusters++ + movw %bx,%cx # ClusterNumber = NextClusterNumber + jmp FatChainLoop +ReadClusters: + incw %bx + popw %ax # ax = StartCluster + pushw %bx # StartCluster = NextClusterNumber + movw %bx,%cx # ClusterNumber = NextClusterNumber + subw $2,%ax # ax = StartCluster - 2 + xorb %bh,%bh + movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster + mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster + addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster + pushw %ax # save start sector + movw %si,%ax # ax = NumberOfClusters + mulw %bx # ax = NumberOfClusters * SectorsPerCluster + movw %ax,%bx # bx = Number of Sectors + popw %ax # ax = Start Sector + call ReadBlocks + movw $1,%si # NumberOfClusters = 1 + jmp FatChainLoop +FoundLastCluster: + popw %cx + popa + ret + + +# **************************************************************************** +# ReadBlocks - Reads a set of blocks from a block device +# +# AX = Start LBA +# BX = Number of Blocks to Read +# ES:DI = Buffer to store sectors read from disk +# **************************************************************************** + +# cx = Blocks +# bx = NumberOfBlocks +# si = StartLBA + +ReadBlocks: + pusha addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA - addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA - movl %eax,%esi # esi = Start LBA - movw %bx,%cx # cx = Number of blocks to read -ReadCylinderLoop: - movw $0x7bfc,%bp # bp = 0x7bfc - movl %esi,%eax # eax = Start LBA - xorl %edx,%edx # edx = 0 - movzwl (%bp), %ebx # bx = MaxSector - divl %ebx # ax = StartLBA / MaxSector - incw %dx # dx = (StartLBA % MaxSector) + 1 - - movw (%bp), %bx # bx = MaxSector - subw %dx,%bx # bx = MaxSector - Sector - incw %bx # bx = MaxSector - Sector + 1 - cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1) - jg LimitTransfer - movw %cx,%bx # bx = Blocks -LimitTransfer: - pushw %ax # save ax - movw %es,%ax # ax = es - shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system - andw $0x7f,%ax # ax = Number of blocks into current seg - addw %bx,%ax # ax = End Block number of transfer - cmpw $0x80,%ax # See if it crosses a 64K boundry - jle NotCrossing64KBoundry # Branch if not crossing 64K boundry - subw $0x80,%ax # ax = Number of blocks past 64K boundry - subw %ax,%bx # Decrease transfer size by block overage -NotCrossing64KBoundry: - popw %ax # restore ax - - pushw %cx - movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector - xorw %dx,%dx # dx = 0 + addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA + movl %eax,%esi # esi = Start LBA + movw %bx,%cx # cx = Number of blocks to read +ReadCylinderLoop: + movw $0x7bfc,%bp # bp = 0x7bfc + movl %esi,%eax # eax = Start LBA + xorl %edx,%edx # edx = 0 + movzwl (%bp), %ebx # bx = MaxSector + divl %ebx # ax = StartLBA / MaxSector + incw %dx # dx = (StartLBA % MaxSector) + 1 + + movw (%bp), %bx # bx = MaxSector + subw %dx,%bx # bx = MaxSector - Sector + incw %bx # bx = MaxSector - Sector + 1 + cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1) + jg LimitTransfer + movw %cx,%bx # bx = Blocks +LimitTransfer: + pushw %ax # save ax + movw %es,%ax # ax = es + shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system + andw $0x7f,%ax # ax = Number of blocks into current seg + addw %bx,%ax # ax = End Block number of transfer + cmpw $0x80,%ax # See if it crosses a 64K boundry + jle NotCrossing64KBoundry # Branch if not crossing 64K boundry + subw $0x80,%ax # ax = Number of blocks past 64K boundry + subw %ax,%bx # Decrease transfer size by block overage +NotCrossing64KBoundry: + popw %ax # restore ax + + pushw %cx + movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector + xorw %dx,%dx # dx = 0 divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder - # dx = ax % (MaxHead + 1) = Head - - pushw %bx # Save number of blocks to transfer - movb %dl,%dh # dh = Head - movw $0x7c00,%bp # bp = 0x7c00 - movb PhysicalDrive(%bp), %dl # dl = Drive Number - movb %al,%ch # ch = Cylinder - movb %bl,%al # al = Blocks - movb $2,%ah # ah = Function 2 - movw %di,%bx # es:bx = Buffer address - int $0x13 - jc DiskError - popw %bx - popw %cx - movzwl %bx,%ebx - addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks - subw %bx,%cx # Blocks = Blocks - NumberOfBlocks - movw %es,%ax - shlw $(BLOCK_SHIFT-4), %bx - addw %bx,%ax - movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE - cmpw $0,%cx - jne ReadCylinderLoop - popa - ret - -DiskError: - pushw %cs - popw %ds - leaw ErrorString,%si - movw $7,%cx - jmp PrintStringAndHalt - -PrintStringAndHalt: - movw $0xb800,%ax - movw %ax,%es - movw $160,%di - rep - movsw -Halt: - jmp Halt - + # dx = ax % (MaxHead + 1) = Head + + pushw %bx # Save number of blocks to transfer + movb %dl,%dh # dh = Head + movw $0x7c00,%bp # bp = 0x7c00 + movb PhysicalDrive(%bp), %dl # dl = Drive Number + movb %al,%ch # ch = Cylinder + movb %bl,%al # al = Blocks + movb $2,%ah # ah = Function 2 + movw %di,%bx # es:bx = Buffer address + int $0x13 + jc DiskError + popw %bx + popw %cx + movzwl %bx,%ebx + addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks + subw %bx,%cx # Blocks = Blocks - NumberOfBlocks + movw %es,%ax + shlw $(BLOCK_SHIFT-4), %bx + addw %bx,%ax + movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE + cmpw $0,%cx + jne ReadCylinderLoop + popa + ret + +DiskError: + pushw %cs + popw %ds + leaw ErrorString,%si + movw $7,%cx + jmp PrintStringAndHalt + +PrintStringAndHalt: + movw $0xb800,%ax + movw %ax,%es + movw $160,%di + rep + movsw +Halt: + jmp Halt + ErrorString: - .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c - - .org 0x01fa -LBAOffsetForBootSector: - .long 0x0 - - .org 0x01fe - .word 0xaa55 - -#****************************************************************************** -#****************************************************************************** -#****************************************************************************** - -.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay -.equ KBD_CONTROL_PORT, 0x060 # 8042 control port -.equ KBD_STATUS_PORT, 0x064 # 8042 status port -.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port -.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20 - - .org 0x200 - jmp start -Em64String: -.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c - -start: - movw %cs,%ax - movw %ax,%ds - movw %ax,%es - movw %ax,%ss - movw $MyStack, %sp - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[160],'a' -# mov ax,cs -# mov es,ax - - movl $0,%ebx - leal MemoryMap, %edi -MemMapLoop: - movl $0xe820,%eax - movl $20,%ecx - movl $0x534d4150, %edx # SMAP - int $0x15 - jc MemMapDone - addl $20,%edi - cmpl $0,%ebx - je MemMapDone - jmp MemMapLoop -MemMapDone: - leal MemoryMap, %eax - subl %eax,%edi # Get the address of the memory map - movl %edi, MemoryMapSize # Save the size of the memory map - - xorl %ebx,%ebx - movw %cs,%bx # BX=segment - shll $4,%ebx # BX="linear" address of segment base + .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c + + .org 0x01fa +LBAOffsetForBootSector: + .long 0x0 + + .org 0x01fe + .word 0xaa55 + +#****************************************************************************** +#****************************************************************************** +#****************************************************************************** + +.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay +.equ KBD_CONTROL_PORT, 0x060 # 8042 control port +.equ KBD_STATUS_PORT, 0x064 # 8042 status port +.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port +.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20 + + .org 0x200 + jmp start +Em64String: +.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c + +start: + movw %cs,%ax + movw %ax,%ds + movw %ax,%es + movw %ax,%ss + movw $MyStack, %sp + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[160],'a' +# mov ax,cs +# mov es,ax + + movl $0,%ebx + leal MemoryMap, %edi +MemMapLoop: + movl $0xe820,%eax + movl $20,%ecx + movl $0x534d4150, %edx # SMAP + int $0x15 + jc MemMapDone + addl $20,%edi + cmpl $0,%ebx + je MemMapDone + jmp MemMapLoop +MemMapDone: + leal MemoryMap, %eax + subl %eax,%edi # Get the address of the memory map + movl %edi, MemoryMapSize # Save the size of the memory map + + xorl %ebx,%ebx + movw %cs,%bx # BX=segment + shll $4,%ebx # BX="linear" address of segment base leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt movl %eax, (gdtr + 2) # Put address of gdt into the gdtr leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt movl %eax, (idtr + 2) # Put address of idt into the idtr - leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[162],'b' -# mov ax,cs -# mov es,ax - -# -# Enable A20 Gate -# - - movw $0x2401,%ax # Enable A20 Gate - int $0x15 - jnc A20GateEnabled # Jump if it suceeded - -# -# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually. -# - - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - jnz Timeout8042 # Jump if the 8042 timed out - outw %ax, $DELAY_PORT # Delay 1 uS - movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port - outb %al, $KBD_STATUS_PORT # Send command to the 8042 - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - jnz Timeout8042 # Jump if the 8042 timed out - movb $ENABLE_A20_CMD, %al # gate address bit 20 on - outb %al, $KBD_CONTROL_PORT # Send command to thre 8042 - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - movw $25,%cx # Delay 25 uS for the command to complete on the 8042 -Delay25uS: - outw %ax, $DELAY_PORT # Delay 1 uS - loop Delay25uS -Timeout8042: - - -A20GateEnabled: - -# -# DISABLE INTERRUPTS - Entering Protected Mode -# - - cli - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[164],'c' -# mov ax,cs -# mov es,ax - - leal OffsetIn32BitProtectedMode, %eax - addl $0x20000+0x6,%eax - movl %eax, OffsetIn32BitProtectedMode - - leal OffsetInLongMode, %eax - addl $0x20000+0x6,%eax - movl %eax, OffsetInLongMode - - # - # load GDT - # - .byte 0x66 - lgdt gdtr - - # - # Enable Protect Mode (set CR0.PE=1) - # - movl $cr0, %eax # Read CR0. - orl $0x1,%eax # Set PE=1 - movl %eax, %cr0 # Write CR0. - .byte 0x66 - .byte 0xea # jmp far 16:32 -OffsetIn32BitProtectedMode: - .long 0x0000000 # offset $+8 (In32BitProtectedMode) - .word 0x10 # selector (flat CS) -In32BitProtectedMode: - -# -# Entering Long Mode -# - .byte 0x66 - movw $8,%ax - movw %ax,%ds - movw %ax,%es - movw %ax,%ss - - # - # Enable the 64-bit page-translation-table entries by - # setting CR4.PAE=1 (this is _required_ before activating - # long mode). Paging is not enabled until after long mode - # is enabled. - # - .byte 0xf - .byte 0x20 - .byte 0xe0 -# mov eax, cr4 - btsl $5,%eax - .byte 0xf - .byte 0x22 - .byte 0xe0 -# mov cr4, eax - - # - # This is the Trapolean Page Tables that are guarenteed - # under 4GB. - # - # Address Map: - # 10000 ~ 12000 - efildr (loaded) - # 20000 ~ 21000 - start64.com - # 21000 ~ 22000 - efi64.com - # 22000 ~ 90000 - efildr - # 90000 ~ 96000 - 4G pagetable (will be reload later) - # - .byte 0xb8 - .long 0x90000 -# mov eax, 90000h - movl %eax, %cr3 - - # - # Enable long mode (set EFER.LME=1). - # - .byte 0xb9 - .long 0xc0000080 -# mov ecx, 0c0000080h ; EFER MSR number. - .byte 0xf - .byte 0x32 -# rdmsr ; Read EFER. - .byte 0xf - .byte 0xba - .byte 0xe8 - .byte 0x8 -# bts eax, 8 ; Set LME=1. - .byte 0xf - .byte 0x30 -# wrmsr ; Write EFER. - - # - # Enable paging to activate long mode (set CR0.PG=1) - # - movl $cr0, %eax # Read CR0. - .byte 0xf - .byte 0xba - .byte 0xe8 - .byte 0x1f -# bts eax, 31 ; Set PG=1. - movl %eax, %cr0 # Write CR0. - jmp GoToLongMode -GoToLongMode: - - .byte 0x67 - .byte 0xea # Far Jump $+9:Selector to reload CS -OffsetInLongMode: - .long 00000000 # $+9 Offset is ensuing instruction boundary - .word 0x38 # Selector is our code selector, 38h - -InLongMode: - .byte 0x66 - movw $0x30,%ax - movw %ax,%ds - - .byte 0x66 - movw $0x18,%ax - movw %ax,%es - movw %ax,%ss - movw %ax,%ds - - .byte 0xbd - .long 0x400000 -# mov ebp,000400000h ; Destination of EFILDR32 - .byte 0xbb - .long 0x70000 -# mov ebx,000070000h ; Length of copy - - # - # load idt later - # - .byte 0x48 - .byte 0x33 - .byte 0xc0 -# xor rax, rax - .byte 0x66 - movw $idtr, %ax - .byte 0x48 - .byte 0x5 - .long 0x20000 -# add rax, 20000h - - .byte 0xf - .byte 0x1 - .byte 0x18 -# lidt fword ptr [rax] - - .byte 0x48 - .byte 0xc7 - .byte 0xc0 - .long 0x21000 -# mov rax, 21000h - .byte 0x50 -# push rax - -# ret - .byte 0xc3 - -Empty8042InputBuffer: - movw $0,%cx -Empty8042Loop: - outw %ax, $DELAY_PORT # Delay 1us - inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port - andb $0x2,%al # Check the Input Buffer Full Flag - loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS - ret - -############################################################################## -# data -############################################################################## - - .align 0x2 - - gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit - .long 0 # (GDT base gets set above) -############################################################################## -# global descriptor table (GDT) -############################################################################## - - .align 0x2 - -GDT_BASE: -# null descriptor -.equ NULL_SEL, .-GDT_BASE # Selector [0x0] - .word 0 # limit 15:0 - .word 0 # base 15:0 - .byte 0 # base 23:16 - .byte 0 # type - .byte 0 # limit 19:16, flags - .byte 0 # base 31:24 - -# linear data segment descriptor -.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# linear code segment descriptor -.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# system data segment descriptor -.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# system code segment descriptor -.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# spare segment descriptor -.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28] - .word 0 # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0 # present, ring 0, data, expand-up, writable - .byte 0 # page-granular, 32-bit - .byte 0 - -# -# system data segment descriptor -# -.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A - .byte 0xCF # G | D | L | AVL | Segment [19..16] - .byte 0 - -# -# system code segment descriptor -# -.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A - .byte 0xAF # G | D | L | AVL | Segment [19..16] - .byte 0 - -# spare segment descriptor -.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40] - .word 0 # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0 # present, ring 0, data, expand-up, writable - .byte 0 # page-granular, 32-bit - .byte 0 - -GDT_END: - - .align 0x2 - - - -idtr: .long IDT_END - IDT_BASE - 1 # IDT limit - .quad 0 # (IDT base gets set above) - -############################################################################## -# interrupt descriptor table (IDT) -# -# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ -# mappings. This implementation only uses the system timer and all other -# IRQs will remain masked. The descriptors for vectors 33+ are provided -# for convenience. -############################################################################## - -#idt_tag db "IDT",0 - .align 0x2 - - -IDT_BASE: -# divide by zero (INT 0) -.equ DIV_ZERO_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# debug exception (INT 1) -.equ DEBUG_EXCEPT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# NMI (INT 2) -.equ NMI_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# soft breakpoint (INT 3) -.equ BREAKPOINT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# overflow (INT 4) -.equ OVERFLOW_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# bounds check (INT 5) -.equ BOUNDS_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# invalid opcode (INT 6) -.equ INVALID_OPCODE_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# device not available (INT 7) -.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# double fault (INT 8) -.equ DOUBLE_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Coprocessor segment overrun - reserved (INT 9) -.equ RSVD_INTR_SEL1, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# invalid TSS (INT 0ah) -.equ INVALID_TSS_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# segment not present (INT 0bh) -.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# stack fault (INT 0ch) -.equ STACK_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# general protection (INT 0dh) -.equ GP_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# page fault (INT 0eh) -.equ PAGE_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Intel reserved - do not use (INT 0fh) -.equ RSVD_INTR_SEL2, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# floating point error (INT 10h) -.equ FLT_POINT_ERR_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# alignment check (INT 11h) -.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# machine check (INT 12h) -.equ MACHINE_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# SIMD floating-point exception (INT 13h) -.equ SIMD_EXCEPTION_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail - .fill 85 * 16, 1, 0 # db (85 * 16) dup(0) - -# IRQ 0 (System timer) - (INT 68h) -.equ IRQ0_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 1 (8042 Keyboard controller) - (INT 69h) -.equ IRQ1_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) -.equ IRQ2_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 3 (COM 2) - (INT 6bh) -.equ IRQ3_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 4 (COM 1) - (INT 6ch) -.equ IRQ4_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 5 (LPT 2) - (INT 6dh) -.equ IRQ5_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 6 (Floppy controller) - (INT 6eh) -.equ IRQ6_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 7 (LPT 1) - (INT 6fh) -.equ IRQ7_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 8 (RTC Alarm) - (INT 70h) -.equ IRQ8_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 9 - (INT 71h) -.equ IRQ9_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 10 - (INT 72h) -.equ IRQ10_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 11 - (INT 73h) -.equ IRQ11_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 12 (PS/2 mouse) - (INT 74h) -.equ IRQ12_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 13 (Floating point error) - (INT 75h) -.equ IRQ13_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 14 (Secondary IDE) - (INT 76h) -.equ IRQ14_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 15 (Primary IDE) - (INT 77h) -.equ IRQ15_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -IDT_END: - - .align 0x2 - -MemoryMapSize: .long 0 -MemoryMap: .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - - .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 - - #.org 0x0fe0 #Just for pass build -MyStack: - # below is the pieces of the IVT that is used to redirect INT 68h - 6fh - # back to INT 08h - 0fh when in real mode... It is 'org'ed to a - # known low address (20f00) so it can be set up by PlMapIrqToVect in - # 8259.c - - int $8 - iret - - int $9 - iret - - int $10 - iret - - int $11 - iret - - int $12 - iret - - int $13 - iret - - int $14 - iret - - int $15 - iret - - - #.org 0x0ffe #Just for pass build -BlockSignature: - .word 0xaa55 - + leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[162],'b' +# mov ax,cs +# mov es,ax + +# +# Enable A20 Gate +# + + movw $0x2401,%ax # Enable A20 Gate + int $0x15 + jnc A20GateEnabled # Jump if it suceeded + +# +# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually. +# + + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + jnz Timeout8042 # Jump if the 8042 timed out + outw %ax, $DELAY_PORT # Delay 1 uS + movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port + outb %al, $KBD_STATUS_PORT # Send command to the 8042 + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + jnz Timeout8042 # Jump if the 8042 timed out + movb $ENABLE_A20_CMD, %al # gate address bit 20 on + outb %al, $KBD_CONTROL_PORT # Send command to thre 8042 + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + movw $25,%cx # Delay 25 uS for the command to complete on the 8042 +Delay25uS: + outw %ax, $DELAY_PORT # Delay 1 uS + loop Delay25uS +Timeout8042: + + +A20GateEnabled: + +# +# DISABLE INTERRUPTS - Entering Protected Mode +# + + cli + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[164],'c' +# mov ax,cs +# mov es,ax + + leal OffsetIn32BitProtectedMode, %eax + addl $0x20000+0x6,%eax + movl %eax, OffsetIn32BitProtectedMode + + leal OffsetInLongMode, %eax + addl $0x20000+0x6,%eax + movl %eax, OffsetInLongMode + + # + # load GDT + # + .byte 0x66 + lgdt gdtr + + # + # Enable Protect Mode (set CR0.PE=1) + # + movl $cr0, %eax # Read CR0. + orl $0x1,%eax # Set PE=1 + movl %eax, %cr0 # Write CR0. + .byte 0x66 + .byte 0xea # jmp far 16:32 +OffsetIn32BitProtectedMode: + .long 0x0000000 # offset $+8 (In32BitProtectedMode) + .word 0x10 # selector (flat CS) +In32BitProtectedMode: + +# +# Entering Long Mode +# + .byte 0x66 + movw $8,%ax + movw %ax,%ds + movw %ax,%es + movw %ax,%ss + + # + # Enable the 64-bit page-translation-table entries by + # setting CR4.PAE=1 (this is _required_ before activating + # long mode). Paging is not enabled until after long mode + # is enabled. + # + .byte 0xf + .byte 0x20 + .byte 0xe0 +# mov eax, cr4 + btsl $5,%eax + .byte 0xf + .byte 0x22 + .byte 0xe0 +# mov cr4, eax + + # + # This is the Trapolean Page Tables that are guarenteed + # under 4GB. + # + # Address Map: + # 10000 ~ 12000 - efildr (loaded) + # 20000 ~ 21000 - start64.com + # 21000 ~ 22000 - efi64.com + # 22000 ~ 90000 - efildr + # 90000 ~ 96000 - 4G pagetable (will be reload later) + # + .byte 0xb8 + .long 0x90000 +# mov eax, 90000h + movl %eax, %cr3 + + # + # Enable long mode (set EFER.LME=1). + # + .byte 0xb9 + .long 0xc0000080 +# mov ecx, 0c0000080h ; EFER MSR number. + .byte 0xf + .byte 0x32 +# rdmsr ; Read EFER. + .byte 0xf + .byte 0xba + .byte 0xe8 + .byte 0x8 +# bts eax, 8 ; Set LME=1. + .byte 0xf + .byte 0x30 +# wrmsr ; Write EFER. + + # + # Enable paging to activate long mode (set CR0.PG=1) + # + movl $cr0, %eax # Read CR0. + .byte 0xf + .byte 0xba + .byte 0xe8 + .byte 0x1f +# bts eax, 31 ; Set PG=1. + movl %eax, %cr0 # Write CR0. + jmp GoToLongMode +GoToLongMode: + + .byte 0x67 + .byte 0xea # Far Jump $+9:Selector to reload CS +OffsetInLongMode: + .long 00000000 # $+9 Offset is ensuing instruction boundary + .word 0x38 # Selector is our code selector, 38h + +InLongMode: + .byte 0x66 + movw $0x30,%ax + movw %ax,%ds + + .byte 0x66 + movw $0x18,%ax + movw %ax,%es + movw %ax,%ss + movw %ax,%ds + + .byte 0xbd + .long 0x400000 +# mov ebp,000400000h ; Destination of EFILDR32 + .byte 0xbb + .long 0x70000 +# mov ebx,000070000h ; Length of copy + + # + # load idt later + # + .byte 0x48 + .byte 0x33 + .byte 0xc0 +# xor rax, rax + .byte 0x66 + movw $idtr, %ax + .byte 0x48 + .byte 0x5 + .long 0x20000 +# add rax, 20000h + + .byte 0xf + .byte 0x1 + .byte 0x18 +# lidt fword ptr [rax] + + .byte 0x48 + .byte 0xc7 + .byte 0xc0 + .long 0x21000 +# mov rax, 21000h + .byte 0x50 +# push rax + +# ret + .byte 0xc3 + +Empty8042InputBuffer: + movw $0,%cx +Empty8042Loop: + outw %ax, $DELAY_PORT # Delay 1us + inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port + andb $0x2,%al # Check the Input Buffer Full Flag + loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS + ret + +############################################################################## +# data +############################################################################## + + .align 0x2 + + gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit + .long 0 # (GDT base gets set above) +############################################################################## +# global descriptor table (GDT) +############################################################################## + + .align 0x2 + +GDT_BASE: +# null descriptor +.equ NULL_SEL, .-GDT_BASE # Selector [0x0] + .word 0 # limit 15:0 + .word 0 # base 15:0 + .byte 0 # base 23:16 + .byte 0 # type + .byte 0 # limit 19:16, flags + .byte 0 # base 31:24 + +# linear data segment descriptor +.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# linear code segment descriptor +.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# system data segment descriptor +.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# system code segment descriptor +.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# spare segment descriptor +.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28] + .word 0 # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0 # present, ring 0, data, expand-up, writable + .byte 0 # page-granular, 32-bit + .byte 0 + +# +# system data segment descriptor +# +.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A + .byte 0xCF # G | D | L | AVL | Segment [19..16] + .byte 0 + +# +# system code segment descriptor +# +.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A + .byte 0xAF # G | D | L | AVL | Segment [19..16] + .byte 0 + +# spare segment descriptor +.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40] + .word 0 # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0 # present, ring 0, data, expand-up, writable + .byte 0 # page-granular, 32-bit + .byte 0 + +GDT_END: + + .align 0x2 + + + +idtr: .long IDT_END - IDT_BASE - 1 # IDT limit + .quad 0 # (IDT base gets set above) + +############################################################################## +# interrupt descriptor table (IDT) +# +# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ +# mappings. This implementation only uses the system timer and all other +# IRQs will remain masked. The descriptors for vectors 33+ are provided +# for convenience. +############################################################################## + +#idt_tag db "IDT",0 + .align 0x2 + + +IDT_BASE: +# divide by zero (INT 0) +.equ DIV_ZERO_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# debug exception (INT 1) +.equ DEBUG_EXCEPT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# NMI (INT 2) +.equ NMI_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# soft breakpoint (INT 3) +.equ BREAKPOINT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# overflow (INT 4) +.equ OVERFLOW_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# bounds check (INT 5) +.equ BOUNDS_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# invalid opcode (INT 6) +.equ INVALID_OPCODE_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# device not available (INT 7) +.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# double fault (INT 8) +.equ DOUBLE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Coprocessor segment overrun - reserved (INT 9) +.equ RSVD_INTR_SEL1, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# invalid TSS (INT 0ah) +.equ INVALID_TSS_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# segment not present (INT 0bh) +.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# stack fault (INT 0ch) +.equ STACK_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# general protection (INT 0dh) +.equ GP_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# page fault (INT 0eh) +.equ PAGE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Intel reserved - do not use (INT 0fh) +.equ RSVD_INTR_SEL2, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# floating point error (INT 10h) +.equ FLT_POINT_ERR_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# alignment check (INT 11h) +.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# machine check (INT 12h) +.equ MACHINE_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# SIMD floating-point exception (INT 13h) +.equ SIMD_EXCEPTION_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail + .fill 85 * 16, 1, 0 # db (85 * 16) dup(0) + +# IRQ 0 (System timer) - (INT 68h) +.equ IRQ0_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 1 (8042 Keyboard controller) - (INT 69h) +.equ IRQ1_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) +.equ IRQ2_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 3 (COM 2) - (INT 6bh) +.equ IRQ3_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 4 (COM 1) - (INT 6ch) +.equ IRQ4_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 5 (LPT 2) - (INT 6dh) +.equ IRQ5_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 6 (Floppy controller) - (INT 6eh) +.equ IRQ6_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 7 (LPT 1) - (INT 6fh) +.equ IRQ7_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 8 (RTC Alarm) - (INT 70h) +.equ IRQ8_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 9 - (INT 71h) +.equ IRQ9_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 10 - (INT 72h) +.equ IRQ10_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 11 - (INT 73h) +.equ IRQ11_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 12 (PS/2 mouse) - (INT 74h) +.equ IRQ12_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 13 (Floating point error) - (INT 75h) +.equ IRQ13_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 14 (Secondary IDE) - (INT 76h) +.equ IRQ14_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 15 (Primary IDE) - (INT 77h) +.equ IRQ15_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +IDT_END: + + .align 0x2 + +MemoryMapSize: .long 0 +MemoryMap: .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + + .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 + + #.org 0x0fe0 #Just for pass build +MyStack: + # below is the pieces of the IVT that is used to redirect INT 68h - 6fh + # back to INT 08h - 0fh when in real mode... It is 'org'ed to a + # known low address (20f00) so it can be set up by PlMapIrqToVect in + # 8259.c + + int $8 + iret + + int $9 + iret + + int $10 + iret + + int $11 + iret + + int $12 + iret + + int $13 + iret + + int $14 + iret + + int $15 + iret + + + #.org 0x0ffe #Just for pass build +BlockSignature: + .word 0xaa55 + diff --git a/DuetPkg/BootSector/start.S b/DuetPkg/BootSector/start.S index 23cfbc05c2..706def4929 100644 --- a/DuetPkg/BootSector/start.S +++ b/DuetPkg/BootSector/start.S @@ -25,10 +25,10 @@ .equ BLOCK_MASK, 0x01ff .equ BLOCK_SHIFT, 9 - .org 0x0 - + .org 0x0 + .global _start -_start: +_start: Ia32Jump: jmp BootSectorEntryPoint # JMP inst - 3 bytes diff --git a/DuetPkg/BootSector/start16.S b/DuetPkg/BootSector/start16.S index bfa028b2f8..13fefb2129 100644 --- a/DuetPkg/BootSector/start16.S +++ b/DuetPkg/BootSector/start16.S @@ -26,10 +26,10 @@ .equ BLOCK_MASK, 0x01ff .equ BLOCK_SHIFT, 9 - .org 0x00 - + .org 0x00 + .global _start -_start: +_start: Ia32Jump: jmp BootSectorEntryPoint # JMP inst - 3 bytes diff --git a/DuetPkg/BootSector/start32.S b/DuetPkg/BootSector/start32.S index 5a5755838a..c8faf266df 100644 --- a/DuetPkg/BootSector/start32.S +++ b/DuetPkg/BootSector/start32.S @@ -26,10 +26,10 @@ .equ BLOCK_MASK, 0x01ff .equ BLOCK_SHIFT, 9 - .org 0x0 - -.global _start -_start: + .org 0x0 + +.global _start +_start: Ia32Jump: jmp BootSectorEntryPoint # JMP inst - 3 bytes diff --git a/DuetPkg/BootSector/start64.S b/DuetPkg/BootSector/start64.S index 5de4208d83..7787adfb5d 100644 --- a/DuetPkg/BootSector/start64.S +++ b/DuetPkg/BootSector/start64.S @@ -1,38 +1,38 @@ -#------------------------------------------------------------------------------ -#* -#* Copyright 2006 - 2007, Intel Corporation -#* All rights reserved. This program and the accompanying materials -#* are licensed and made available under the terms and conditions of the BSD License -#* which accompanies this distribution. The full text of the license may be found at -#* http://opensource.org/licenses/bsd-license.php -#* -#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, -#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. -#* -#* start64.asm -#* -#* Abstract: -#* -#------------------------------------------------------------------------------ - - - .stack: - .486p: - .code16 - +#------------------------------------------------------------------------------ +#* +#* Copyright 2006 - 2007, Intel Corporation +#* All rights reserved. This program and the accompanying materials +#* are licensed and made available under the terms and conditions of the BSD License +#* which accompanies this distribution. The full text of the license may be found at +#* http://opensource.org/licenses/bsd-license.php +#* +#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +#* +#* start64.asm +#* +#* Abstract: +#* +#------------------------------------------------------------------------------ + + + .stack: + .486p: + .code16 + .equ FAT_DIRECTORY_ENTRY_SIZE, 0x020 .equ FAT_DIRECTORY_ENTRY_SHIFT, 5 .equ BLOCK_SIZE, 0x0200 .equ BLOCK_MASK, 0x01ff .equ BLOCK_SHIFT, 9 - - .org 0x0 -Ia32Jump: - jmp BootSectorEntryPoint # JMP inst - 3 bytes - nop - -OemId: .ascii "INTEL " # OemId - 8 bytes - + + .org 0x0 +Ia32Jump: + jmp BootSectorEntryPoint # JMP inst - 3 bytes + nop + +OemId: .ascii "INTEL " # OemId - 8 bytes + SectorSize: .word 0 # Sector Size - 16 bits SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits ReservedSectors: .word 0 # Reserved Sectors - 16 bits @@ -50,1097 +50,1097 @@ CurrentHead: .byte 0 # Current Head - 8 bits Signature: .byte 0 # Signature - 8 bits - ignored VolId: .ascii " " # Volume Serial Number- 4 bytes FatLabel: .ascii " " # Label - 11 bytes -SystemId: .ascii "FAT12 " # SystemId - 8 bytes - -BootSectorEntryPoint: - # ASSUME ds:@code" - # ASSUME ss:@code" - # ds = 1000, es = 2000 + x (size of first cluster >> 4) - # cx = Start Cluster of EfiLdr - # dx = Start Cluster of Efivar.bin - -# Re use the BPB data stored in Boot Sector - movw $0x7c00,%bp - - pushw %cx -# Read Efivar.bin -# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already - movw $0x1900,%ax - movw %ax,%es - testw %dx,%dx - jnz CheckVarStoreSize - - movb $1,%al -NoVarStore: - pushw %es -# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl - movb %al, %es:(4) - jmp SaveVolumeId - -CheckVarStoreSize: - movw %dx,%di - cmpl $0x4000, %ds:2(%di) - movb $2,%al - jne NoVarStore - -LoadVarStore: - movb $0,%al - movb %al, %es:(4) - movw (%di), %cx -# ES:DI = 1500:0 - xorw %di,%di - pushw %es - movw $0x1500,%ax - movw %ax,%es - call ReadFile -SaveVolumeId: - popw %es - movw VolId(%bp), %ax - movw %ax, %es:(0) - movw VolId+2(%bp), %ax - movw %ax, %es:(2) - -# Read Efildr - popw %cx -# cx = Start Cluster of Efildr -> BS.com has filled already -# ES:DI = 2000:0, first cluster will be read again - xorw %di,%di # di = 0 - movw $0x2000,%ax - movw %ax,%es - call ReadFile - movw %cs,%ax - movw %ax, %cs:JumpSegment - -CheckEm64T: - movl $0x80000001,%eax -# cpuid - .word 0xA20F - btl $29,%edx - jc CheckEm64TPass - pushw %cs - popw %ds - leaw Em64String,%si - movw $18,%cx - jmp PrintStringAndHalt -CheckEm64TPass: -jumpFarInstruction: - .byte 0xea -jumpOffset: - .word 0x200 -jumpSegment: - .word 0x2000 - - - -# **************************************************************************** -# ReadFile -# -# Arguments: -# CX = Start Cluster of File -# ES:DI = Buffer to store file content read from disk -# -# Return: -# (ES << 4 + DI) = end of file content Buffer -# -# **************************************************************************** -ReadFile: -# si = NumberOfClusters -# cx = ClusterNumber -# dx = CachedFatSectorNumber -# ds:0000 = CacheFatSectorBuffer -# es:di = Buffer to load file -# bx = NextClusterNumber - pusha - movw $1,%si # NumberOfClusters = 1 - pushw %cx # Push Start Cluster onto stack - movw $0xfff,%dx # CachedFatSectorNumber = 0xfff -FatChainLoop: - movw %cx,%ax # ax = ClusterNumber - andw $0xff8,%ax # ax = ax & 0xff8 - cmpw $0xff8,%ax # See if this is the last cluster - je FoundLastCluster # Jump if last cluster found - movw %cx,%ax # ax = ClusterNumber - shlw %ax # ax = ClusterNumber * 2 - addw %cx,%ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3 - shrw %ax # FatOffset = ClusterNumber*3 / 2 - pushw %si # Save si - movw %ax,%si # si = FatOffset - shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT - addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) - andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK - cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber - je SkipFatRead - movw $2,%bx - pushw %es - pushw %ds - popw %es - call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI - popw %es - movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber -SkipFatRead: - movw (%si), %bx # bx = NextClusterNumber - movw %cx,%ax # ax = ClusterNumber - andw $1,%ax # See if this is an odd cluster number - je EvenFatEntry - shrw $4,%bx # NextClusterNumber = NextClusterNumber >> 4 -EvenFatEntry: - andw $0xfff,%bx # Strip upper 4 bits of NextClusterNumber - popw %si # Restore si - decw %bx # bx = NextClusterNumber - 1 - cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber - jne ReadClusters - incw %bx # bx = NextClusterNumber - incw %si # NumberOfClusters++ - movw %bx,%cx # ClusterNumber = NextClusterNumber - jmp FatChainLoop -ReadClusters: - incw %bx - popw %ax # ax = StartCluster - pushw %bx # StartCluster = NextClusterNumber - movw %bx,%cx # ClusterNumber = NextClusterNumber - subw $2,%ax # ax = StartCluster - 2 - xorb %bh,%bh - movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster - mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster - addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster - pushw %ax # save start sector - movw %si,%ax # ax = NumberOfClusters - mulw %bx # ax = NumberOfClusters * SectorsPerCluster - movw %ax,%bx # bx = Number of Sectors - popw %ax # ax = Start Sector - call ReadBlocks - movw $1,%si # NumberOfClusters = 1 - jmp FatChainLoop -FoundLastCluster: - popw %cx - popa - ret - - -# **************************************************************************** -# ReadBlocks - Reads a set of blocks from a block device -# -# AX = Start LBA -# BX = Number of Blocks to Read -# ES:DI = Buffer to store sectors read from disk -# **************************************************************************** - -# cx = Blocks -# bx = NumberOfBlocks -# si = StartLBA - -ReadBlocks: - pusha +SystemId: .ascii "FAT12 " # SystemId - 8 bytes + +BootSectorEntryPoint: + # ASSUME ds:@code" + # ASSUME ss:@code" + # ds = 1000, es = 2000 + x (size of first cluster >> 4) + # cx = Start Cluster of EfiLdr + # dx = Start Cluster of Efivar.bin + +# Re use the BPB data stored in Boot Sector + movw $0x7c00,%bp + + pushw %cx +# Read Efivar.bin +# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already + movw $0x1900,%ax + movw %ax,%es + testw %dx,%dx + jnz CheckVarStoreSize + + movb $1,%al +NoVarStore: + pushw %es +# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl + movb %al, %es:(4) + jmp SaveVolumeId + +CheckVarStoreSize: + movw %dx,%di + cmpl $0x4000, %ds:2(%di) + movb $2,%al + jne NoVarStore + +LoadVarStore: + movb $0,%al + movb %al, %es:(4) + movw (%di), %cx +# ES:DI = 1500:0 + xorw %di,%di + pushw %es + movw $0x1500,%ax + movw %ax,%es + call ReadFile +SaveVolumeId: + popw %es + movw VolId(%bp), %ax + movw %ax, %es:(0) + movw VolId+2(%bp), %ax + movw %ax, %es:(2) + +# Read Efildr + popw %cx +# cx = Start Cluster of Efildr -> BS.com has filled already +# ES:DI = 2000:0, first cluster will be read again + xorw %di,%di # di = 0 + movw $0x2000,%ax + movw %ax,%es + call ReadFile + movw %cs,%ax + movw %ax, %cs:JumpSegment + +CheckEm64T: + movl $0x80000001,%eax +# cpuid + .word 0xA20F + btl $29,%edx + jc CheckEm64TPass + pushw %cs + popw %ds + leaw Em64String,%si + movw $18,%cx + jmp PrintStringAndHalt +CheckEm64TPass: +jumpFarInstruction: + .byte 0xea +jumpOffset: + .word 0x200 +jumpSegment: + .word 0x2000 + + + +# **************************************************************************** +# ReadFile +# +# Arguments: +# CX = Start Cluster of File +# ES:DI = Buffer to store file content read from disk +# +# Return: +# (ES << 4 + DI) = end of file content Buffer +# +# **************************************************************************** +ReadFile: +# si = NumberOfClusters +# cx = ClusterNumber +# dx = CachedFatSectorNumber +# ds:0000 = CacheFatSectorBuffer +# es:di = Buffer to load file +# bx = NextClusterNumber + pusha + movw $1,%si # NumberOfClusters = 1 + pushw %cx # Push Start Cluster onto stack + movw $0xfff,%dx # CachedFatSectorNumber = 0xfff +FatChainLoop: + movw %cx,%ax # ax = ClusterNumber + andw $0xff8,%ax # ax = ax & 0xff8 + cmpw $0xff8,%ax # See if this is the last cluster + je FoundLastCluster # Jump if last cluster found + movw %cx,%ax # ax = ClusterNumber + shlw %ax # ax = ClusterNumber * 2 + addw %cx,%ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3 + shrw %ax # FatOffset = ClusterNumber*3 / 2 + pushw %si # Save si + movw %ax,%si # si = FatOffset + shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT + addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) + andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK + cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber + je SkipFatRead + movw $2,%bx + pushw %es + pushw %ds + popw %es + call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI + popw %es + movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber +SkipFatRead: + movw (%si), %bx # bx = NextClusterNumber + movw %cx,%ax # ax = ClusterNumber + andw $1,%ax # See if this is an odd cluster number + je EvenFatEntry + shrw $4,%bx # NextClusterNumber = NextClusterNumber >> 4 +EvenFatEntry: + andw $0xfff,%bx # Strip upper 4 bits of NextClusterNumber + popw %si # Restore si + decw %bx # bx = NextClusterNumber - 1 + cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber + jne ReadClusters + incw %bx # bx = NextClusterNumber + incw %si # NumberOfClusters++ + movw %bx,%cx # ClusterNumber = NextClusterNumber + jmp FatChainLoop +ReadClusters: + incw %bx + popw %ax # ax = StartCluster + pushw %bx # StartCluster = NextClusterNumber + movw %bx,%cx # ClusterNumber = NextClusterNumber + subw $2,%ax # ax = StartCluster - 2 + xorb %bh,%bh + movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster + mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster + addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster + pushw %ax # save start sector + movw %si,%ax # ax = NumberOfClusters + mulw %bx # ax = NumberOfClusters * SectorsPerCluster + movw %ax,%bx # bx = Number of Sectors + popw %ax # ax = Start Sector + call ReadBlocks + movw $1,%si # NumberOfClusters = 1 + jmp FatChainLoop +FoundLastCluster: + popw %cx + popa + ret + + +# **************************************************************************** +# ReadBlocks - Reads a set of blocks from a block device +# +# AX = Start LBA +# BX = Number of Blocks to Read +# ES:DI = Buffer to store sectors read from disk +# **************************************************************************** + +# cx = Blocks +# bx = NumberOfBlocks +# si = StartLBA + +ReadBlocks: + pusha addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA - addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA - movl %eax,%esi # esi = Start LBA - movw %bx,%cx # cx = Number of blocks to read -ReadCylinderLoop: - movw $0x7bfc,%bp # bp = 0x7bfc - movl %esi,%eax # eax = Start LBA - xorl %edx,%edx # edx = 0 - movzwl (%bp), %ebx # bx = MaxSector - divl %ebx # ax = StartLBA / MaxSector - incw %dx # dx = (StartLBA % MaxSector) + 1 - - movw (%bp), %bx # bx = MaxSector - subw %dx,%bx # bx = MaxSector - Sector - incw %bx # bx = MaxSector - Sector + 1 - cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1) - jg LimitTransfer - movw %cx,%bx # bx = Blocks -LimitTransfer: - pushw %ax # save ax - movw %es,%ax # ax = es - shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system - andw $0x7f,%ax # ax = Number of blocks into current seg - addw %bx,%ax # ax = End Block number of transfer - cmpw $0x80,%ax # See if it crosses a 64K boundry - jle NotCrossing64KBoundry # Branch if not crossing 64K boundry - subw $0x80,%ax # ax = Number of blocks past 64K boundry - subw %ax,%bx # Decrease transfer size by block overage -NotCrossing64KBoundry: - popw %ax # restore ax - - pushw %cx - movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector - xorw %dx,%dx # dx = 0 - divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder - # dx = ax % (MaxHead + 1) = Head - - pushw %bx # Save number of blocks to transfer - movb %dl,%dh # dh = Head - movw $0x7c00,%bp # bp = 0x7c00 - movb PhysicalDrive(%bp), %dl # dl = Drive Number - movb %al,%ch # ch = Cylinder - movb %bl,%al # al = Blocks - movb $2,%ah # ah = Function 2 - movw %di,%bx # es:bx = Buffer address - int $0x13 - jc DiskError - popw %bx - popw %cx - movzwl %bx,%ebx - addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks - subw %bx,%cx # Blocks = Blocks - NumberOfBlocks - movw %es,%ax - shlw $(BLOCK_SHIFT-4), %bx - addw %bx,%ax - movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE - cmpw $0,%cx - jne ReadCylinderLoop - popa - ret - -DiskError: - pushw %cs - popw %ds - leaw ErrorString,%si - movw $7,%cx - jmp PrintStringAndHalt - -PrintStringAndHalt: - movw $0xb800,%ax - movw %ax,%es - movw $160,%di - rep - movsw -Halt: - jmp Halt - + addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA + movl %eax,%esi # esi = Start LBA + movw %bx,%cx # cx = Number of blocks to read +ReadCylinderLoop: + movw $0x7bfc,%bp # bp = 0x7bfc + movl %esi,%eax # eax = Start LBA + xorl %edx,%edx # edx = 0 + movzwl (%bp), %ebx # bx = MaxSector + divl %ebx # ax = StartLBA / MaxSector + incw %dx # dx = (StartLBA % MaxSector) + 1 + + movw (%bp), %bx # bx = MaxSector + subw %dx,%bx # bx = MaxSector - Sector + incw %bx # bx = MaxSector - Sector + 1 + cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1) + jg LimitTransfer + movw %cx,%bx # bx = Blocks +LimitTransfer: + pushw %ax # save ax + movw %es,%ax # ax = es + shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system + andw $0x7f,%ax # ax = Number of blocks into current seg + addw %bx,%ax # ax = End Block number of transfer + cmpw $0x80,%ax # See if it crosses a 64K boundry + jle NotCrossing64KBoundry # Branch if not crossing 64K boundry + subw $0x80,%ax # ax = Number of blocks past 64K boundry + subw %ax,%bx # Decrease transfer size by block overage +NotCrossing64KBoundry: + popw %ax # restore ax + + pushw %cx + movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector + xorw %dx,%dx # dx = 0 + divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder + # dx = ax % (MaxHead + 1) = Head + + pushw %bx # Save number of blocks to transfer + movb %dl,%dh # dh = Head + movw $0x7c00,%bp # bp = 0x7c00 + movb PhysicalDrive(%bp), %dl # dl = Drive Number + movb %al,%ch # ch = Cylinder + movb %bl,%al # al = Blocks + movb $2,%ah # ah = Function 2 + movw %di,%bx # es:bx = Buffer address + int $0x13 + jc DiskError + popw %bx + popw %cx + movzwl %bx,%ebx + addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks + subw %bx,%cx # Blocks = Blocks - NumberOfBlocks + movw %es,%ax + shlw $(BLOCK_SHIFT-4), %bx + addw %bx,%ax + movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE + cmpw $0,%cx + jne ReadCylinderLoop + popa + ret + +DiskError: + pushw %cs + popw %ds + leaw ErrorString,%si + movw $7,%cx + jmp PrintStringAndHalt + +PrintStringAndHalt: + movw $0xb800,%ax + movw %ax,%es + movw $160,%di + rep + movsw +Halt: + jmp Halt + ErrorString: - .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c - - .org 0x01fa -LBAOffsetForBootSector: - .long 0x0 - - .org 0x01fe - .word 0xaa55 - -#****************************************************************************** -#****************************************************************************** -#****************************************************************************** - + .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c + + .org 0x01fa +LBAOffsetForBootSector: + .long 0x0 + + .org 0x01fe + .word 0xaa55 + +#****************************************************************************** +#****************************************************************************** +#****************************************************************************** + .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay .equ KBD_CONTROL_PORT, 0x060 # 8042 control port .equ KBD_STATUS_PORT, 0x064 # 8042 status port .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port -.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20 - - .org 0x200 - jmp start -Em64String: -.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c - -start: - movw %cs,%ax - movw %ax,%ds - movw %ax,%es - movw %ax,%ss - movw $MyStack, %sp - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[160],'a' -# mov ax,cs -# mov es,ax - - movl $0,%ebx - leal MemoryMap, %edi -MemMapLoop: - movl $0xe820,%eax - movl $20,%ecx - movl $0x534d4150, %edx # SMAP - int $0x15 - jc MemMapDone - addl $20,%edi - cmpl $0,%ebx - je MemMapDone - jmp MemMapLoop -MemMapDone: - leal MemoryMap, %eax - subl %eax,%edi # Get the address of the memory map - movl %edi, MemoryMapSize # Save the size of the memory map - - xorl %ebx,%ebx - movw %cs,%bx # BX=segment - shll $4,%ebx # BX="linear" address of segment base +.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20 + + .org 0x200 + jmp start +Em64String: +.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c + +start: + movw %cs,%ax + movw %ax,%ds + movw %ax,%es + movw %ax,%ss + movw $MyStack, %sp + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[160],'a' +# mov ax,cs +# mov es,ax + + movl $0,%ebx + leal MemoryMap, %edi +MemMapLoop: + movl $0xe820,%eax + movl $20,%ecx + movl $0x534d4150, %edx # SMAP + int $0x15 + jc MemMapDone + addl $20,%edi + cmpl $0,%ebx + je MemMapDone + jmp MemMapLoop +MemMapDone: + leal MemoryMap, %eax + subl %eax,%edi # Get the address of the memory map + movl %edi, MemoryMapSize # Save the size of the memory map + + xorl %ebx,%ebx + movw %cs,%bx # BX=segment + shll $4,%ebx # BX="linear" address of segment base leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt movl %eax, (gdtr + 2) # Put address of gdt into the gdtr leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt movl %eax, (idtr + 2) # Put address of idt into the idtr - leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[162],'b' -# mov ax,cs -# mov es,ax - -# -# Enable A20 Gate -# - - movw $0x2401,%ax # Enable A20 Gate - int $0x15 - jnc A20GateEnabled # Jump if it suceeded - -# -# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually. -# - - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - jnz Timeout8042 # Jump if the 8042 timed out - outw %ax, $DELAY_PORT # Delay 1 uS - movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port - outb %al, $KBD_STATUS_PORT # Send command to the 8042 - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - jnz Timeout8042 # Jump if the 8042 timed out - movb $ENABLE_A20_CMD, %al # gate address bit 20 on - outb %al, $KBD_CONTROL_PORT # Send command to thre 8042 - call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller - movw $25,%cx # Delay 25 uS for the command to complete on the 8042 -Delay25uS: - outw %ax, $DELAY_PORT # Delay 1 uS - loop Delay25uS -Timeout8042: - - -A20GateEnabled: - -# -# DISABLE INTERRUPTS - Entering Protected Mode -# - - cli - -# mov ax,0b800h -# mov es,ax -# mov byte ptr es:[164],'c' -# mov ax,cs -# mov es,ax - - leal OffsetIn32BitProtectedMode, %eax - addl $0x20000+0x6,%eax - movl %eax, OffsetIn32BitProtectedMode - - leal OffsetInLongMode, %eax - addl $0x20000+0x6,%eax - movl %eax, OffsetInLongMode - - # - # load GDT - # - .byte 0x66 - lgdt gdtr - - # - # Enable Protect Mode (set CR0.PE=1) - # - movl %cr0, %eax # Read CR0. - orl $0x1,%eax # Set PE=1 - movl %eax, %cr0 # Write CR0. - .byte 0x66 - .byte 0xea # jmp far 16:32 -OffsetIn32BitProtectedMode: - .long 0x0000000 # offset $+8 (In32BitProtectedMode) - .word 0x10 # selector (flat CS) -In32BitProtectedMode: - -# -# Entering Long Mode -# - .byte 0x66 - movw $8,%ax - movw %ax,%ds - movw %ax,%es - movw %ax,%ss - - # - # Enable the 64-bit page-translation-table entries by - # setting CR4.PAE=1 (this is _required_ before activating - # long mode). Paging is not enabled until after long mode - # is enabled. - # - .byte 0xf - .byte 0x20 - .byte 0xe0 -# mov eax, cr4 - btsl $5,%eax - .byte 0xf - .byte 0x22 - .byte 0xe0 -# mov cr4, eax - - # - # This is the Trapolean Page Tables that are guarenteed - # under 4GB. - # - # Address Map: - # 10000 ~ 12000 - efildr (loaded) - # 20000 ~ 21000 - start64.com - # 21000 ~ 22000 - efi64.com - # 22000 ~ 90000 - efildr - # 90000 ~ 96000 - 4G pagetable (will be reload later) - # - .byte 0xb8 - .long 0x90000 -# mov eax, 90000h - movl %eax, %cr3 - - # - # Enable long mode (set EFER.LME=1). - # - .byte 0xb9 - .long 0xc0000080 -# mov ecx, 0c0000080h ; EFER MSR number. - .byte 0xf - .byte 0x32 -# rdmsr ; Read EFER. - .byte 0xf - .byte 0xba - .byte 0xe8 - .byte 0x8 -# bts eax, 8 ; Set LME=1. - .byte 0xf - .byte 0x30 -# wrmsr ; Write EFER. - - # - # Enable paging to activate long mode (set CR0.PG=1) - # - movl $cr0, %eax # Read CR0. - .byte 0xf - .byte 0xba - .byte 0xe8 - .byte 0x1f -# bts eax, 31 ; Set PG=1. - movl %eax, %cr0 # Write CR0. - jmp GoToLongMode -GoToLongMode: - - .byte 0x67 - .byte 0xea # Far Jump $+9:Selector to reload CS -OffsetInLongMode: - .long 00000000 # $+9 Offset is ensuing instruction boundary - .word 0x38 # Selector is our code selector, 38h - -InLongMode: - .byte 0x66 - movw $0x30,%ax - movw %ax,%ds - - .byte 0x66 - movw $0x18,%ax - movw %ax,%es - movw %ax,%ss - movw %ax,%ds - - .byte 0xbd - .long 0x400000 -# mov ebp,000400000h ; Destination of EFILDR32 - .byte 0xbb - .long 0x70000 -# mov ebx,000070000h ; Length of copy - - # - # load idt later - # - .byte 0x48 - .byte 0x33 - .byte 0xc0 -# xor rax, rax - .byte 0x66 - movw $idtr, %ax - .byte 0x48 - .byte 0x5 - .long 0x20000 -# add rax, 20000h - - .byte 0xf - .byte 0x1 - .byte 0x18 -# lidt fword ptr [rax] - - .byte 0x48 - .byte 0xc7 - .byte 0xc0 - .long 0x21000 -# mov rax, 21000h - .byte 0x50 -# push rax - -# ret - .byte 0xc3 - -Empty8042InputBuffer: - movw $0,%cx -Empty8042Loop: - outw %ax, $DELAY_PORT # Delay 1us - inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port - andb $0x2,%al # Check the Input Buffer Full Flag - loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS - ret - -############################################################################## -# data -############################################################################## - - .align 0x2 - - gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit - .long 0 # (GDT base gets set above) -############################################################################## -# global descriptor table (GDT) -############################################################################## - - .align 0x2 - -GDT_BASE: -# null descriptor -.equ NULL_SEL, .-GDT_BASE # Selector [0x0] - .word 0 # limit 15:0 - .word 0 # base 15:0 - .byte 0 # base 23:16 - .byte 0 # type - .byte 0 # limit 19:16, flags - .byte 0 # base 31:24 - -# linear data segment descriptor -.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# linear code segment descriptor -.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# system data segment descriptor -.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# system code segment descriptor -.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # present, ring 0, data, expand-up, writable - .byte 0xCF # page-granular, 32-bit - .byte 0 - -# spare segment descriptor -.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28] - .word 0 # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0 # present, ring 0, data, expand-up, writable - .byte 0 # page-granular, 32-bit - .byte 0 - -# -# system data segment descriptor -# -.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A - .byte 0xCF # G | D | L | AVL | Segment [19..16] - .byte 0 - -# -# system code segment descriptor -# -.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38] - .word 0xFFFF # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A - .byte 0xAF # G | D | L | AVL | Segment [19..16] - .byte 0 - -# spare segment descriptor -.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40] - .word 0 # limit 0xFFFFF - .word 0 # base 0 - .byte 0 - .byte 0 # present, ring 0, data, expand-up, writable - .byte 0 # page-granular, 32-bit - .byte 0 - -GDT_END: - - .align 0x2 - - - -idtr: .long IDT_END - IDT_BASE - 1 # IDT limit - .quad 0 # (IDT base gets set above) - -############################################################################## -# interrupt descriptor table (IDT) -# -# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ -# mappings. This implementation only uses the system timer and all other -# IRQs will remain masked. The descriptors for vectors 33+ are provided -# for convenience. -############################################################################## - -#idt_tag db "IDT",0 - .align 0x2 - - -IDT_BASE: -# divide by zero (INT 0) -.equ DIV_ZERO_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# debug exception (INT 1) -.equ DEBUG_EXCEPT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# NMI (INT 2) -.equ NMI_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# soft breakpoint (INT 3) -.equ BREAKPOINT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# overflow (INT 4) -.equ OVERFLOW_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# bounds check (INT 5) -.equ BOUNDS_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# invalid opcode (INT 6) -.equ INVALID_OPCODE_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# device not available (INT 7) -.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# double fault (INT 8) -.equ DOUBLE_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Coprocessor segment overrun - reserved (INT 9) -.equ RSVD_INTR_SEL1, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# invalid TSS (INT 0ah) -.equ INVALID_TSS_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# segment not present (INT 0bh) -.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# stack fault (INT 0ch) -.equ STACK_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# general protection (INT 0dh) -.equ GP_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# page fault (INT 0eh) -.equ PAGE_FAULT_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Intel reserved - do not use (INT 0fh) -.equ RSVD_INTR_SEL2, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# floating point error (INT 10h) -.equ FLT_POINT_ERR_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# alignment check (INT 11h) -.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# machine check (INT 12h) -.equ MACHINE_CHECK_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# SIMD floating-point exception (INT 13h) -.equ SIMD_EXCEPTION_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail - .fill 85 * 16, 1, 0 # db (85 * 16) dup(0) - -# IRQ 0 (System timer) - (INT 68h) -.equ IRQ0_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 1 (8042 Keyboard controller) - (INT 69h) -.equ IRQ1_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) -.equ IRQ2_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 3 (COM 2) - (INT 6bh) -.equ IRQ3_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 4 (COM 1) - (INT 6ch) -.equ IRQ4_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 5 (LPT 2) - (INT 6dh) -.equ IRQ5_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 6 (Floppy controller) - (INT 6eh) -.equ IRQ6_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 7 (LPT 1) - (INT 6fh) -.equ IRQ7_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 8 (RTC Alarm) - (INT 70h) -.equ IRQ8_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 9 - (INT 71h) -.equ IRQ9_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 10 - (INT 72h) -.equ IRQ10_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 11 - (INT 73h) -.equ IRQ11_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 12 (PS/2 mouse) - (INT 74h) -.equ IRQ12_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 13 (Floating point error) - (INT 75h) -.equ IRQ13_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 14 (Secondary IDE) - (INT 76h) -.equ IRQ14_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -# IRQ 15 (Primary IDE) - (INT 77h) -.equ IRQ15_SEL, .-IDT_BASE - .word 0 # offset 15:0 - .long SYS_CODE64_SEL # selector 15:0 - .byte 0 # 0 for interrupt gate - .byte 0x0e | 0x80 # type = 386 interrupt gate, present - .word 0 # offset 31:16 - .long 0 # offset 63:32 - .long 0 # 0 for reserved - -IDT_END: - - .align 0x2 - -MemoryMapSize: .long 0 -MemoryMap: .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0 - - .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 - .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 - - .org 0x0fe0 -MyStack: - # below is the pieces of the IVT that is used to redirect INT 68h - 6fh - # back to INT 08h - 0fh when in real mode... It is 'org'ed to a - # known low address (20f00) so it can be set up by PlMapIrqToVect in - # 8259.c - - int $8 - iret - - int $9 - iret - - int $10 - iret - - int $11 - iret - - int $12 - iret - - int $13 - iret - - int $14 - iret - - int $15 - iret - - - .org 0x0ffe -BlockSignature: - .word 0xaa55 - + leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[162],'b' +# mov ax,cs +# mov es,ax + +# +# Enable A20 Gate +# + + movw $0x2401,%ax # Enable A20 Gate + int $0x15 + jnc A20GateEnabled # Jump if it suceeded + +# +# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually. +# + + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + jnz Timeout8042 # Jump if the 8042 timed out + outw %ax, $DELAY_PORT # Delay 1 uS + movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port + outb %al, $KBD_STATUS_PORT # Send command to the 8042 + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + jnz Timeout8042 # Jump if the 8042 timed out + movb $ENABLE_A20_CMD, %al # gate address bit 20 on + outb %al, $KBD_CONTROL_PORT # Send command to thre 8042 + call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller + movw $25,%cx # Delay 25 uS for the command to complete on the 8042 +Delay25uS: + outw %ax, $DELAY_PORT # Delay 1 uS + loop Delay25uS +Timeout8042: + + +A20GateEnabled: + +# +# DISABLE INTERRUPTS - Entering Protected Mode +# + + cli + +# mov ax,0b800h +# mov es,ax +# mov byte ptr es:[164],'c' +# mov ax,cs +# mov es,ax + + leal OffsetIn32BitProtectedMode, %eax + addl $0x20000+0x6,%eax + movl %eax, OffsetIn32BitProtectedMode + + leal OffsetInLongMode, %eax + addl $0x20000+0x6,%eax + movl %eax, OffsetInLongMode + + # + # load GDT + # + .byte 0x66 + lgdt gdtr + + # + # Enable Protect Mode (set CR0.PE=1) + # + movl %cr0, %eax # Read CR0. + orl $0x1,%eax # Set PE=1 + movl %eax, %cr0 # Write CR0. + .byte 0x66 + .byte 0xea # jmp far 16:32 +OffsetIn32BitProtectedMode: + .long 0x0000000 # offset $+8 (In32BitProtectedMode) + .word 0x10 # selector (flat CS) +In32BitProtectedMode: + +# +# Entering Long Mode +# + .byte 0x66 + movw $8,%ax + movw %ax,%ds + movw %ax,%es + movw %ax,%ss + + # + # Enable the 64-bit page-translation-table entries by + # setting CR4.PAE=1 (this is _required_ before activating + # long mode). Paging is not enabled until after long mode + # is enabled. + # + .byte 0xf + .byte 0x20 + .byte 0xe0 +# mov eax, cr4 + btsl $5,%eax + .byte 0xf + .byte 0x22 + .byte 0xe0 +# mov cr4, eax + + # + # This is the Trapolean Page Tables that are guarenteed + # under 4GB. + # + # Address Map: + # 10000 ~ 12000 - efildr (loaded) + # 20000 ~ 21000 - start64.com + # 21000 ~ 22000 - efi64.com + # 22000 ~ 90000 - efildr + # 90000 ~ 96000 - 4G pagetable (will be reload later) + # + .byte 0xb8 + .long 0x90000 +# mov eax, 90000h + movl %eax, %cr3 + + # + # Enable long mode (set EFER.LME=1). + # + .byte 0xb9 + .long 0xc0000080 +# mov ecx, 0c0000080h ; EFER MSR number. + .byte 0xf + .byte 0x32 +# rdmsr ; Read EFER. + .byte 0xf + .byte 0xba + .byte 0xe8 + .byte 0x8 +# bts eax, 8 ; Set LME=1. + .byte 0xf + .byte 0x30 +# wrmsr ; Write EFER. + + # + # Enable paging to activate long mode (set CR0.PG=1) + # + movl $cr0, %eax # Read CR0. + .byte 0xf + .byte 0xba + .byte 0xe8 + .byte 0x1f +# bts eax, 31 ; Set PG=1. + movl %eax, %cr0 # Write CR0. + jmp GoToLongMode +GoToLongMode: + + .byte 0x67 + .byte 0xea # Far Jump $+9:Selector to reload CS +OffsetInLongMode: + .long 00000000 # $+9 Offset is ensuing instruction boundary + .word 0x38 # Selector is our code selector, 38h + +InLongMode: + .byte 0x66 + movw $0x30,%ax + movw %ax,%ds + + .byte 0x66 + movw $0x18,%ax + movw %ax,%es + movw %ax,%ss + movw %ax,%ds + + .byte 0xbd + .long 0x400000 +# mov ebp,000400000h ; Destination of EFILDR32 + .byte 0xbb + .long 0x70000 +# mov ebx,000070000h ; Length of copy + + # + # load idt later + # + .byte 0x48 + .byte 0x33 + .byte 0xc0 +# xor rax, rax + .byte 0x66 + movw $idtr, %ax + .byte 0x48 + .byte 0x5 + .long 0x20000 +# add rax, 20000h + + .byte 0xf + .byte 0x1 + .byte 0x18 +# lidt fword ptr [rax] + + .byte 0x48 + .byte 0xc7 + .byte 0xc0 + .long 0x21000 +# mov rax, 21000h + .byte 0x50 +# push rax + +# ret + .byte 0xc3 + +Empty8042InputBuffer: + movw $0,%cx +Empty8042Loop: + outw %ax, $DELAY_PORT # Delay 1us + inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port + andb $0x2,%al # Check the Input Buffer Full Flag + loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS + ret + +############################################################################## +# data +############################################################################## + + .align 0x2 + + gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit + .long 0 # (GDT base gets set above) +############################################################################## +# global descriptor table (GDT) +############################################################################## + + .align 0x2 + +GDT_BASE: +# null descriptor +.equ NULL_SEL, .-GDT_BASE # Selector [0x0] + .word 0 # limit 15:0 + .word 0 # base 15:0 + .byte 0 # base 23:16 + .byte 0 # type + .byte 0 # limit 19:16, flags + .byte 0 # base 31:24 + +# linear data segment descriptor +.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# linear code segment descriptor +.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# system data segment descriptor +.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# system code segment descriptor +.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # present, ring 0, data, expand-up, writable + .byte 0xCF # page-granular, 32-bit + .byte 0 + +# spare segment descriptor +.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28] + .word 0 # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0 # present, ring 0, data, expand-up, writable + .byte 0 # page-granular, 32-bit + .byte 0 + +# +# system data segment descriptor +# +.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A + .byte 0xCF # G | D | L | AVL | Segment [19..16] + .byte 0 + +# +# system code segment descriptor +# +.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38] + .word 0xFFFF # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A + .byte 0xAF # G | D | L | AVL | Segment [19..16] + .byte 0 + +# spare segment descriptor +.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40] + .word 0 # limit 0xFFFFF + .word 0 # base 0 + .byte 0 + .byte 0 # present, ring 0, data, expand-up, writable + .byte 0 # page-granular, 32-bit + .byte 0 + +GDT_END: + + .align 0x2 + + + +idtr: .long IDT_END - IDT_BASE - 1 # IDT limit + .quad 0 # (IDT base gets set above) + +############################################################################## +# interrupt descriptor table (IDT) +# +# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ +# mappings. This implementation only uses the system timer and all other +# IRQs will remain masked. The descriptors for vectors 33+ are provided +# for convenience. +############################################################################## + +#idt_tag db "IDT",0 + .align 0x2 + + +IDT_BASE: +# divide by zero (INT 0) +.equ DIV_ZERO_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# debug exception (INT 1) +.equ DEBUG_EXCEPT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# NMI (INT 2) +.equ NMI_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# soft breakpoint (INT 3) +.equ BREAKPOINT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# overflow (INT 4) +.equ OVERFLOW_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# bounds check (INT 5) +.equ BOUNDS_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# invalid opcode (INT 6) +.equ INVALID_OPCODE_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# device not available (INT 7) +.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# double fault (INT 8) +.equ DOUBLE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Coprocessor segment overrun - reserved (INT 9) +.equ RSVD_INTR_SEL1, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# invalid TSS (INT 0ah) +.equ INVALID_TSS_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# segment not present (INT 0bh) +.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# stack fault (INT 0ch) +.equ STACK_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# general protection (INT 0dh) +.equ GP_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# page fault (INT 0eh) +.equ PAGE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Intel reserved - do not use (INT 0fh) +.equ RSVD_INTR_SEL2, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# floating point error (INT 10h) +.equ FLT_POINT_ERR_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# alignment check (INT 11h) +.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# machine check (INT 12h) +.equ MACHINE_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# SIMD floating-point exception (INT 13h) +.equ SIMD_EXCEPTION_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail + .fill 85 * 16, 1, 0 # db (85 * 16) dup(0) + +# IRQ 0 (System timer) - (INT 68h) +.equ IRQ0_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 1 (8042 Keyboard controller) - (INT 69h) +.equ IRQ1_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) +.equ IRQ2_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 3 (COM 2) - (INT 6bh) +.equ IRQ3_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 4 (COM 1) - (INT 6ch) +.equ IRQ4_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 5 (LPT 2) - (INT 6dh) +.equ IRQ5_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 6 (Floppy controller) - (INT 6eh) +.equ IRQ6_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 7 (LPT 1) - (INT 6fh) +.equ IRQ7_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 8 (RTC Alarm) - (INT 70h) +.equ IRQ8_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 9 - (INT 71h) +.equ IRQ9_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 10 - (INT 72h) +.equ IRQ10_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 11 - (INT 73h) +.equ IRQ11_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 12 (PS/2 mouse) - (INT 74h) +.equ IRQ12_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 13 (Floating point error) - (INT 75h) +.equ IRQ13_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 14 (Secondary IDE) - (INT 76h) +.equ IRQ14_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +# IRQ 15 (Primary IDE) - (INT 77h) +.equ IRQ15_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .long SYS_CODE64_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + .long 0 # offset 63:32 + .long 0 # 0 for reserved + +IDT_END: + + .align 0x2 + +MemoryMapSize: .long 0 +MemoryMap: .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + + .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 + + .org 0x0fe0 +MyStack: + # below is the pieces of the IVT that is used to redirect INT 68h - 6fh + # back to INT 08h - 0fh when in real mode... It is 'org'ed to a + # known low address (20f00) so it can be set up by PlMapIrqToVect in + # 8259.c + + int $8 + iret + + int $9 + iret + + int $10 + iret + + int $11 + iret + + int $12 + iret + + int $13 + iret + + int $14 + iret + + int $15 + iret + + + .org 0x0ffe +BlockSignature: + .word 0xaa55 +