mirror of https://github.com/acidanthera/audk.git
Port Intel .asm to GAS S
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7557 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
gikidy
parent
01f1138afe
commit
ccec4c3969
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@ -0,0 +1,581 @@
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#------------------------------------------------------------------------------
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#*
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#* Copyright 2006, Intel Corporation
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#* All rights reserved. This program and the accompanying materials
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#* are licensed and made available under the terms and conditions of the BSD License
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#* which accompanies this distribution. The full text of the license may be found at
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#* http://opensource.org/licenses/bsd-license.php
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#*
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#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#*
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#* efi32.asm
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#*
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#* Abstract:
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#*
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#------------------------------------------------------------------------------
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##############################################################################
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# Now in 32-bit protected mode.
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##############################################################################
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.486:
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#.MODEL flat
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.stack:
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.code:
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.org 0x21000
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.equ DEFAULT_HANDLER_SIZE, INT1 - INT0
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.macro jmpCommonIdtEntry
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# jmp commonIdtEntry - this must be hand coded to keep the assembler from
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# using a 8 bit reletive jump when the entries are
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# within 255 bytes of the common entry. This must
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# be done to maintain the consistency of the size
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# of entry points...
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.byte 0xe9 # jmp 16 bit relative
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.long commonIdtEntry - . - 4 # A problem
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.endm
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Start:
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw %ax, %gs
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movw %ax, %ss
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movl $0x001ffff0, %esp
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call ClearScreen
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# Populate IDT with meaningful offsets for exception handlers...
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sidt Idtr
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movl Halt, %eax
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movl %eax, %ebx # use bx to copy 15..0 to descriptors
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shrl $16, %eax # use ax to copy 31..16 to descriptors
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movl $0x78, %ecx # 78h IDT entries to initialize with unique entry points (exceptions)
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movl (Idtr + 2), %esi
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movl (%esi), %edi
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LOOP_1: # loop through all IDT entries exception handlers and initialize to default handler
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movw %bx, (%edi) # write bits 15..0 of offset
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movw $0x20, 2(%edi) # SYS_CODE_SEL from GDT
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movw $(0x0e00 | 0x8000), 4(%edi) # type = 386 interrupt gate, present
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movw %ax, 6(%edi) # write bits 31..16 of offset
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addl $8, %edi # move up to next descriptor
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addw DEFAULT_HANDLER_SIZE, %bx # move to next entry point
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loopl LOOP_1 # loop back through again until all descriptors are initialized
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## at this point edi contains the offset of the descriptor for INT 20
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## and bx contains the low 16 bits of the offset of the default handler
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## so initialize all the rest of the descriptors with these two values...
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# mov ecx, 101 ; there are 100 descriptors left (INT 20 (14h) - INT 119 (77h)
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#@@: ; loop through all IDT entries exception handlers and initialize to default handler
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# mov word ptr [edi], bx ; write bits 15..0 of offset
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# mov word ptr [edi+2], 20h ; SYS_CODE_SEL from GDT
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# mov word ptr [edi+4], 0e00h OR 8000h ; type = 386 interrupt gate, present
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# mov word ptr [edi+6], ax ; write bits 31..16 of offset
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# add edi, 8 ; move up to next descriptor
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# loop @b ; loop back through again until all descriptors are initialized
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## DUMP location of IDT and several of the descriptors
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# mov ecx, 8
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# mov eax, [offset Idtr + 2]
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# mov eax, [eax]
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# mov edi, 0b8000h
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# call PrintDword
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# mov esi, eax
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# mov edi, 0b80a0h
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# jmp OuterLoop
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##
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## just for fun, let's do a software interrupt to see if we correctly land in the exception handler...
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# mov eax, 011111111h
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# mov ebx, 022222222h
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# mov ecx, 033333333h
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# mov edx, 044444444h
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# mov ebp, 055555555h
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# mov esi, 066666666h
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# mov edi, 077777777h
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# push 011111111h
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# push 022222222h
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# push 033333333h
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# int 119
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movl $0x22000, %esi # esi = 22000
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movl 0x14(%esi), %eax # eax = [22014]
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addl %eax, %esi # esi = 22000 + [22014] = Base of EFILDR.C
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movl 0x3c(%esi), %ebp # ebp = [22000 + [22014] + 3c] = NT Image Header for EFILDR.C
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addl %esi, %ebp
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movl 0x34(%ebp), %edi # edi = [[22000 + [22014] + 3c] + 30] = ImageBase
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movl 0x28(%ebp), %eax # eax = [[22000 + [22014] + 3c] + 24] = EntryPoint
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addl %edi, %eax # eax = ImageBase + EntryPoint
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movl %eax, EfiLdrOffset # Modify far jump instruction for correct entry point
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movw 6(%ebp), %bx # bx = Number of sections
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xorl %eax, %eax
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movw 0x14(%ebp), %ax # ax = Optional Header Size
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addl %eax, %ebp
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addl $0x18, %ebp # ebp = Start of 1st Section
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SectionLoop:
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pushl %esi # Save Base of EFILDR.C
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pushl %edi # Save ImageBase
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addl 0x14(%ebp), %esi # esi = Base of EFILDR.C + PointerToRawData
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addl 0x0c(%ebp), %edi # edi = ImageBase + VirtualAddress
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movl 0x10(%ebp), %ecx # ecs = SizeOfRawData
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cld
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shrl $2, %ecx
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rep
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movsl
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popl %edi # Restore ImageBase
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popl %esi # Restore Base of EFILDR.C
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addw $0x28, %bp # ebp = ebp + 028h = Pointer to next section record
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decw %bx
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cmpw $0, %bx
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jne SectionLoop
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movzwl Idtr, %eax # get size of IDT
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incl %eax
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addl Idtr + 2, %eax # add to base of IDT to get location of memory map...
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pushl %eax # push memory map location on stack for call to EFILDR...
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pushl %eax # push return address (useless, just for stack balance)
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.byte 0xb8
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EfiLdrOffset:
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.long 0x00401000 # Offset of EFILDR
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# mov eax, 401000h
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pushl %eax
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ret
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# db "**** DEFAULT IDT ENTRY ***",0
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.align 0x2
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Halt:
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INT0:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x0
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jmpCommonIdtEntry
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# db 0e9h ; jmp 16 bit reletive
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# dd commonIdtEntry - $ - 4 ; offset to jump to
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INT1:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x1
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jmpCommonIdtEntry
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INT2:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x2
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jmpCommonIdtEntry
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INT3:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x3
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jmpCommonIdtEntry
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INT4:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x4
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jmpCommonIdtEntry
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INT5:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x5
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jmpCommonIdtEntry
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INT6:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x6
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jmpCommonIdtEntry
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INT7:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x7
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jmpCommonIdtEntry
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INT8:
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# Double fault causes an error code to be pushed so no phony push necessary
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nop
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nop
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pushl $0x8
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jmpCommonIdtEntry
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INT9:
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pushl $0x0 # push error code place holder on the stack
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pushl $0x9
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jmpCommonIdtEntry
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INT10:
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# Invalid TSS causes an error code to be pushed so no phony push necessary
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nop
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nop
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pushl $10
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jmpCommonIdtEntry
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INT11:
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# Segment Not Present causes an error code to be pushed so no phony push necessary
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nop
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nop
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pushl $11
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jmpCommonIdtEntry
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INT12:
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# Stack fault causes an error code to be pushed so no phony push necessary
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nop
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nop
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pushl $12
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jmpCommonIdtEntry
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INT13:
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# GP fault causes an error code to be pushed so no phony push necessary
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nop
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nop
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pushl $13
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jmpCommonIdtEntry
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INT14:
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# Page fault causes an error code to be pushed so no phony push necessary
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nop
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nop
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pushl $14
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jmpCommonIdtEntry
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INT15:
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pushl $0x0 # push error code place holder on the stack
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pushl $15
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jmpCommonIdtEntry
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INT16:
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pushl $0x0 # push error code place holder on the stack
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pushl $16
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jmpCommonIdtEntry
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INT17:
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# Alignment check causes an error code to be pushed so no phony push necessary
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nop
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nop
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pushl $17
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jmpCommonIdtEntry
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INT18:
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pushl $0x0 # push error code place holder on the stack
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pushl $18
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jmpCommonIdtEntry
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INT19:
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pushl $0x0 # push error code place holder on the stack
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pushl $19
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jmpCommonIdtEntry
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INTUnknown:
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.rept (0x78 - 20)
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pushl $0x0 # push error code place holder on the stack
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# push $0xxx # push vector number
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.byte 0x6a
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.long ( . - INTUnknown - 3 ) / 9 + 20 # vector number
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jmpCommonIdtEntry
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.endr
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commonIdtEntry:
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pushal
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movl %esp, %ebp
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##
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## At this point the stack looks like this:
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##
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## eflags
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## Calling CS
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## Calling EIP
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## Error code or 0
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## Int num or 0ffh for unknown int num
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## eax
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## ecx
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## edx
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## ebx
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## esp
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## ebp
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## esi
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## edi <------- ESP, EBP
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##
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call ClearScreen
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movl String1, %esi
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call PrintString
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movl 32(%ebp), %eax ## move Int number into EAX
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cmpl $19, %eax
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ja PrintDefaultString
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PrintExceptionString:
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shll $2, %eax ## multiply by 4 to get offset from StringTable to actual string address
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addl StringTable, %eax
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movl (%eax), %esi
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jmp PrintTheString
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PrintDefaultString:
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movl IntUnknownString, %esi
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# patch Int number
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movl %eax, %edx
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call A2C
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movb %al, 1(%esi)
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movl %edx, %eax
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shrl $4, %eax
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call A2C
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movb %al, (%esi)
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PrintTheString:
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call PrintString
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movl String2, %esi
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call PrintString
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movl 44(%ebp), %eax # CS
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call PrintDword
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movb ':', %al
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movb %al, (%edi)
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addl $2, %edi
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movl 40(%ebp), %eax # EIP
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call PrintDword
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movl String3, %esi
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call PrintString
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movl $0xb8140, %edi
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movl StringEax, %esi # eax
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call PrintString
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movl 28(%ebp), %eax
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call PrintDword
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movl StringEbx, %esi # ebx
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call PrintString
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movl 16(%ebp), %eax
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call PrintDword
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movl StringEcx, %esi # ecx
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call PrintString
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movl 24(%ebp), %eax
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call PrintDword
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movl StringEdx, %esi # edx
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call PrintString
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movl 20(%ebp), %eax
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call PrintDword
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movl StringEcode, %esi # error code
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call PrintString
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movl 36(%ebp), %eax
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call PrintDword
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movl $0xb81e0, %edi
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movl StringEsp, %esi # esp
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call PrintString
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movl 12(%ebp), %eax
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call PrintDword
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movl StringEbp, %esi # ebp
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call PrintString
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movl 8(%ebp), %eax
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call PrintDword
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movl StringEsi, %esi # esi
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call PrintString
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movl 4(%ebp), %eax
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call PrintDword
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movl StringEdi, %esi # edi
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call PrintString
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movl (%ebp), %eax
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call PrintDword
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movl StringEflags, %esi # eflags
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call PrintString
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movl 48(%ebp), %eax
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call PrintDword
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movl $0xb8320, %edi
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movl %ebp, %esi
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addl $52, %esi
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movl $8, %ecx
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OuterLoop:
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pushl %ecx
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movl $8, %ecx
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movl %edi, %edx
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InnerLoop:
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movl (%esi), %eax
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call PrintDword
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addl $4, %esi
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movb ' ', %al
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movb %al, (%edi)
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addl $2, %edi
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loop InnerLoop
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popl %ecx
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addl $0xa0, %edx
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movl %edx, %edi
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loop OuterLoop
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movl $0xb8960, %edi
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movl 40(%ebp), %eax # EIP
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subl $32*4, %eax
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movl %eax, %esi # esi = eip - 32 DWORD linear (total 64 DWORD)
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movl $8, %ecx
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OuterLoop1:
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pushl %ecx
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movl $8, %ecx
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movl %edi, %edx
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InnerLoop1:
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movl (%esi), %eax
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call PrintDword
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addl $4, %esi
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movb ' ', %al
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movb %al, (%edi)
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addl $2, %edi
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loop InnerLoop1
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popl %ecx
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addl $0xa0, %edx
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movl %edx, %edi
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loop OuterLoop1
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# wbinvd ; this intruction does not support in early than 486 arch
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LN_C1:
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jmp LN_C1
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#
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# return
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#
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movl %ebp, %esp
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popal
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addl $8, %esp # error code and INT number
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iretl
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PrintString:
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pushl %eax
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LN_C2:
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movb (%esi), %al
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cmpb $0, %al
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je LN_C3
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movb %al, (%edi)
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incl %esi
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addl $2, %edi
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jmp LN_C2
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LN_C3:
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popl %eax
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ret
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## EAX contains dword to print
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## EDI contains memory location (screen location) to print it to
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PrintDword:
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pushl %ecx
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pushl %ebx
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pushl %eax
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movl $8, %ecx
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looptop:
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roll $4, %eax
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movb %al, %bl
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andb $0xf, %bl
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addb '0', %bl
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cmpb '9', %bl
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jle LN_C4
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addb $7, %bl
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LN_C4:
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movb %bl, (%edi)
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addl $2, %edi
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loop looptop
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#wbinvd
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popl %eax
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popl %ebx
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popl %ecx
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ret
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ClearScreen:
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pushl %eax
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pushl %ecx
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movb ' ', %al
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movb $0xc, %ah
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movl $0xb8000, %edi
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movl $80*24, %ecx
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LN_C5:
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movw %ax, (%edi)
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addl $2, %edi
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loop LN_C5
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movl $0xb8000, %edi
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popl %ecx
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popl %eax
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ret
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||||
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A2C:
|
||||
andb $0xf, %al
|
||||
addb '0', %al
|
||||
cmpb '9', %al
|
||||
jle LN_C6
|
||||
addb $7, %al
|
||||
LN_C6:
|
||||
ret
|
||||
|
||||
String1: .asciz "*** INT "
|
||||
|
||||
Int0String: .asciz "00h Divide by 0 -"
|
||||
Int1String: .asciz "01h Debug exception -"
|
||||
Int2String: .asciz "02h NMI -"
|
||||
Int3String: .asciz "03h Breakpoint -"
|
||||
Int4String: .asciz "04h Overflow -"
|
||||
Int5String: .asciz "05h Bound -"
|
||||
Int6String: .asciz "06h Invalid opcode -"
|
||||
Int7String: .asciz "07h Device not available -"
|
||||
Int8String: .asciz "08h Double fault -"
|
||||
Int9String: .asciz "09h Coprocessor seg overrun (reserved) -"
|
||||
Int10String: .asciz "0Ah Invalid TSS -"
|
||||
Int11String: .asciz "0Bh Segment not present -"
|
||||
Int12String: .asciz "0Ch Stack fault -"
|
||||
Int13String: .asciz "0Dh General protection fault -"
|
||||
Int14String: .asciz "0Eh Page fault -"
|
||||
Int15String: .asciz "0Fh (Intel reserved) -"
|
||||
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 -"
|
||||
|
||||
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 ")"
|
||||
StringEax: .asciz "EAX="
|
||||
StringEbx: .asciz "EBX="
|
||||
StringEcx: .asciz "ECX="
|
||||
StringEdx: .asciz "EDX="
|
||||
StringEcode: .asciz "ECODE="
|
||||
StringEsp: .asciz "ESP="
|
||||
StringEbp: .asciz "EBP="
|
||||
StringEsi: .asciz "ESI="
|
||||
StringEdi: .asciz "EDI="
|
||||
StringEflags: .asciz "EFLAGS="
|
||||
|
||||
Idtr: .float 0
|
||||
|
||||
.org 0x21ffe
|
||||
BlockSignature:
|
||||
.word 0xaa55
|
||||
|
||||
|
||||
|
|
@ -16,6 +16,10 @@
|
|||
#------------------------------------------------------------------------------
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
.equ FAT_DIRECTORY_ENTRY_SIZE, 0x020
|
||||
.equ FAT_DIRECTORY_ENTRY_SHIFT, 5
|
||||
.equ BLOCK_SIZE, 0x0200
|
||||
|
|
@ -149,9 +153,9 @@ FatChainLoop:
|
|||
shrw %ax # FatOffset = ClusterNumber*3 / 2
|
||||
pushw %si # Save si
|
||||
movw %ax, %si # si = FatOffset
|
||||
shrw %ax # ax = FatOffset >> BLOCK_SHIFT
|
||||
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
|
||||
andw $BLOCK_MASK,%si # si = FatOffset & BLOCK_MASK
|
||||
cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber
|
||||
je SkipFatRead
|
||||
movw $2, %bx
|
||||
|
|
@ -279,7 +283,7 @@ NotCrossing64KBoundry:
|
|||
DiskError:
|
||||
pushw %cs
|
||||
popw %ds
|
||||
leaw %cs:ErrorString, %si
|
||||
leaw ErrorString, %si
|
||||
movw $7, %cx
|
||||
jmp PrintStringAndHalt
|
||||
|
||||
|
|
@ -295,7 +299,7 @@ Halt:
|
|||
ErrorString:
|
||||
.byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c
|
||||
|
||||
#.org 0x0242 # For Code size overflow, Modified this just for pass build
|
||||
.org 0x0241 # For Code size overflow, Modified this just for pass build
|
||||
LBAOffsetForBootSector:
|
||||
.long 0x0
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,928 @@
|
|||
#------------------------------------------------------------------------------
|
||||
#*
|
||||
#* 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.
|
||||
#*
|
||||
#* start32.asm
|
||||
#*
|
||||
#* Abstract:
|
||||
#*
|
||||
#------------------------------------------------------------------------------
|
||||
|
||||
#.MODEL small
|
||||
.stack:
|
||||
.486p:
|
||||
.code:
|
||||
|
||||
.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
|
||||
SectorSize: .word 0 # Sector Size - 2 bytes
|
||||
SectorsPerCluster: .byte 0 # Sector Per Cluster - 1 byte
|
||||
ReservedSectors: .word 0 # Reserved Sectors - 2 bytes
|
||||
NoFats: .byte 0 # Number of FATs - 1 byte
|
||||
RootEntries: .word 0 # Root Entries - 2 bytes
|
||||
Sectors: .word 0 # Number of Sectors - 2 bytes
|
||||
Media: .byte 0 # Media - 1 byte
|
||||
SectorsPerFat16: .word 0 # Sectors Per FAT for FAT12/FAT16 - 2 byte
|
||||
SectorsPerTrack: .word 0 # Sectors Per Track - 2 bytes
|
||||
Heads: .word 0 # Heads - 2 bytes
|
||||
HiddenSectors: .long 0 # Hidden Sectors - 4 bytes
|
||||
LargeSectors: .long 0 # Large Sectors - 4 bytes
|
||||
|
||||
#******************************************************************************
|
||||
#
|
||||
#The structure for FAT32 starting at offset 36 of the boot sector. (At this point,
|
||||
#the BPB/boot sector for FAT12 and FAT16 differs from the BPB/boot sector for FAT32.)
|
||||
#
|
||||
#******************************************************************************
|
||||
|
||||
SectorsPerFat32: .long 0 # Sectors Per FAT for FAT32 - 4 bytes
|
||||
ExtFlags: .word 0 # Mirror Flag - 2 bytes
|
||||
FSVersion: .word 0 # File System Version - 2 bytes
|
||||
RootCluster: .long 0 # 1st Cluster Number of Root Dir - 4 bytes
|
||||
FSInfo: .word 0 # Sector Number of FSINFO - 2 bytes
|
||||
BkBootSector: .word 0 # Sector Number of Bk BootSector - 2 bytes
|
||||
Reserved: .fill 12,1,0 # Reserved Field - 12 bytes
|
||||
PhysicalDrive: .byte 0 # Physical Drive Number - 1 byte
|
||||
Reserved1: .byte 0 # Reserved Field - 1 byte
|
||||
Signature: .byte 0 # Extended Boot Signature - 1 byte
|
||||
VolId: .ascii " " # Volume Serial Number - 4 bytes
|
||||
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
|
||||
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) # 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
|
||||
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 * 4
|
||||
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
|
||||
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 # Will cause build break
|
||||
LBAOffsetForBootSector:
|
||||
.long 0x0
|
||||
|
||||
.org 0x01fe # Will cause build break
|
||||
.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 # Will cause build break
|
||||
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 # 0x534d4150 = '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
|
||||
|
||||
addl $0x1000, %ebx # Source of EFI32
|
||||
movl %ebx, JUMP+2
|
||||
addl $0x1000, %ebx
|
||||
movl %ebx, %esi # Source of EFILDR32
|
||||
|
||||
# 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
|
||||
loopl 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
|
||||
|
||||
.byte 0x66
|
||||
lgdt gdtr
|
||||
.byte 0x66
|
||||
lidt idtr
|
||||
|
||||
movl %cr0, %eax
|
||||
orb $1, %al
|
||||
movl %eax, %cr0
|
||||
|
||||
movl $0x008, %eax # Flat data descriptor
|
||||
movl $0x00400000, %ebp # Destination of EFILDR32
|
||||
movl $0x00070000, %ebx # Length of copy
|
||||
|
||||
JUMP:
|
||||
# jmp far 0010:00020000
|
||||
.byte 0x66
|
||||
.byte 0xea
|
||||
.long 0x00020000
|
||||
.word 0x0010
|
||||
|
||||
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: .word GDT_END - GDT_BASE - 1
|
||||
.long 0 # (GDT base gets set above)
|
||||
##############################################################################
|
||||
# global descriptor table (GDT)
|
||||
##############################################################################
|
||||
|
||||
.align 0x2
|
||||
|
||||
GDT_BASE:
|
||||
# null descriptor
|
||||
.equ NULL_SEL, .-GDT_BASE
|
||||
.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
|
||||
.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
|
||||
.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
|
||||
.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
|
||||
.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
|
||||
.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
|
||||
|
||||
# spare segment descriptor
|
||||
.equ SPARE4_SEL, .-GDT_BASE
|
||||
.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
|
||||
|
||||
# spare segment descriptor
|
||||
.equ SPARE5_SEL, .-GDT_BASE
|
||||
.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: .word IDT_END - IDT_BASE - 1
|
||||
.long 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
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# debug exception (INT 1)
|
||||
.equ DEBUG_EXCEPT_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# NMI (INT 2)
|
||||
.equ NMI_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# soft breakpoint (INT 3)
|
||||
.equ BREAKPOINT_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# overflow (INT 4)
|
||||
.equ OVERFLOW_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# bounds check (INT 5)
|
||||
.equ BOUNDS_CHECK_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# invalid opcode (INT 6)
|
||||
.equ INVALID_OPCODE_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# device not available (INT 7)
|
||||
.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# double fault (INT 8)
|
||||
.equ DOUBLE_FAULT_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# Coprocessor segment overrun - reserved (INT 9)
|
||||
.equ RSVD_INTR_SEL1, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# invalid TSS (INT 0ah)
|
||||
.equ INVALID_TSS_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# segment not present (INT 0bh)
|
||||
.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# stack fault (INT 0ch)
|
||||
.equ STACK_FAULT_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# general protection (INT 0dh)
|
||||
.equ GP_FAULT_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# page fault (INT 0eh)
|
||||
.equ PAGE_FAULT_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# Intel reserved - do not use (INT 0fh)
|
||||
.equ RSVD_INTR_SEL2, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# floating point error (INT 10h)
|
||||
.equ FLT_POINT_ERR_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# alignment check (INT 11h)
|
||||
.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# machine check (INT 12h)
|
||||
.equ MACHINE_CHECK_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# SIMD floating-point exception (INT 13h)
|
||||
.equ SIMD_EXCEPTION_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
|
||||
.fill 85 * 8, 1, 0
|
||||
|
||||
# IRQ 0 (System timer) - (INT 68h)
|
||||
.equ IRQ0_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 1 (8042 Keyboard controller) - (INT 69h)
|
||||
.equ IRQ1_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
|
||||
.equ IRQ2_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 3 (COM 2) - (INT 6bh)
|
||||
.equ IRQ3_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 4 (COM 1) - (INT 6ch)
|
||||
.equ IRQ4_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 5 (LPT 2) - (INT 6dh)
|
||||
.equ IRQ5_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 6 (Floppy controller) - (INT 6eh)
|
||||
.equ IRQ6_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 7 (LPT 1) - (INT 6fh)
|
||||
.equ IRQ7_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 8 (RTC Alarm) - (INT 70h)
|
||||
.equ IRQ8_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 9 - (INT 71h)
|
||||
.equ IRQ9_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 10 - (INT 72h)
|
||||
.equ IRQ10_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 11 - (INT 73h)
|
||||
.equ IRQ11_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 12 (PS/2 mouse) - (INT 74h)
|
||||
.equ IRQ12_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 13 (Floating point error) - (INT 75h)
|
||||
.equ IRQ13_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 14 (Secondary IDE) - (INT 76h)
|
||||
.equ IRQ14_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
# IRQ 15 (Primary IDE) - (INT 77h)
|
||||
.equ IRQ15_SEL, .-IDT_BASE
|
||||
.word 0 # offset 15:0
|
||||
.word SYS_CODE_SEL # selector 15:0
|
||||
.byte 0 # 0 for interrupt gate
|
||||
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
|
||||
.word 0 # offset 31:16
|
||||
|
||||
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
|
||||
|
||||
|
||||
Loading…
Reference in New Issue