2009-02-20 09:22:04 +01:00
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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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2009-02-26 15:41:56 +01:00
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.code:
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2009-02-20 09:22:04 +01:00
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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
|
|
|
|
|
movl String3, %esi
|
|
|
|
|
call PrintString
|
|
|
|
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|
|
|
|
|
movl $0xb8140, %edi
|
|
|
|
|
|
|
|
|
|
movl StringEax, %esi # eax
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 28(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEbx, %esi # ebx
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 16(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEcx, %esi # ecx
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 24(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEdx, %esi # edx
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 20(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEcode, %esi # error code
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 36(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl $0xb81e0, %edi
|
|
|
|
|
|
|
|
|
|
movl StringEsp, %esi # esp
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 12(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEbp, %esi # ebp
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 8(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEsi, %esi # esi
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 4(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEdi, %esi # edi
|
|
|
|
|
call PrintString
|
|
|
|
|
movl (%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl StringEflags, %esi # eflags
|
|
|
|
|
call PrintString
|
|
|
|
|
movl 48(%ebp), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
|
|
|
|
|
movl $0xb8320, %edi
|
|
|
|
|
|
|
|
|
|
movl %ebp, %esi
|
|
|
|
|
addl $52, %esi
|
|
|
|
|
movl $8, %ecx
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
OuterLoop:
|
|
|
|
|
pushl %ecx
|
|
|
|
|
movl $8, %ecx
|
|
|
|
|
movl %edi, %edx
|
|
|
|
|
|
|
|
|
|
InnerLoop:
|
|
|
|
|
movl (%esi), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
addl $4, %esi
|
|
|
|
|
movb ' ', %al
|
|
|
|
|
movb %al, (%edi)
|
|
|
|
|
addl $2, %edi
|
|
|
|
|
loop InnerLoop
|
|
|
|
|
|
|
|
|
|
popl %ecx
|
|
|
|
|
addl $0xa0, %edx
|
|
|
|
|
movl %edx, %edi
|
|
|
|
|
loop OuterLoop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
movl $0xb8960, %edi
|
|
|
|
|
|
|
|
|
|
movl 40(%ebp), %eax # EIP
|
|
|
|
|
subl $32*4, %eax
|
|
|
|
|
movl %eax, %esi # esi = eip - 32 DWORD linear (total 64 DWORD)
|
|
|
|
|
|
|
|
|
|
movl $8, %ecx
|
|
|
|
|
|
|
|
|
|
OuterLoop1:
|
|
|
|
|
pushl %ecx
|
|
|
|
|
movl $8, %ecx
|
|
|
|
|
movl %edi, %edx
|
|
|
|
|
|
|
|
|
|
InnerLoop1:
|
|
|
|
|
movl (%esi), %eax
|
|
|
|
|
call PrintDword
|
|
|
|
|
addl $4, %esi
|
|
|
|
|
movb ' ', %al
|
|
|
|
|
movb %al, (%edi)
|
|
|
|
|
addl $2, %edi
|
|
|
|
|
loop InnerLoop1
|
|
|
|
|
|
|
|
|
|
popl %ecx
|
|
|
|
|
addl $0xa0, %edx
|
|
|
|
|
movl %edx, %edi
|
|
|
|
|
loop OuterLoop1
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# wbinvd ; this intruction does not support in early than 486 arch
|
|
|
|
|
LN_C1:
|
|
|
|
|
jmp LN_C1
|
|
|
|
|
#
|
|
|
|
|
# return
|
|
|
|
|
#
|
|
|
|
|
movl %ebp, %esp
|
|
|
|
|
popal
|
|
|
|
|
addl $8, %esp # error code and INT number
|
|
|
|
|
|
|
|
|
|
iretl
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
PrintString:
|
|
|
|
|
pushl %eax
|
|
|
|
|
LN_C2:
|
|
|
|
|
movb (%esi), %al
|
|
|
|
|
cmpb $0, %al
|
|
|
|
|
je LN_C3
|
|
|
|
|
movb %al, (%edi)
|
|
|
|
|
incl %esi
|
|
|
|
|
addl $2, %edi
|
|
|
|
|
jmp LN_C2
|
|
|
|
|
LN_C3:
|
|
|
|
|
popl %eax
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
## EAX contains dword to print
|
|
|
|
|
## EDI contains memory location (screen location) to print it to
|
|
|
|
|
PrintDword:
|
|
|
|
|
pushl %ecx
|
|
|
|
|
pushl %ebx
|
|
|
|
|
pushl %eax
|
|
|
|
|
|
|
|
|
|
movl $8, %ecx
|
|
|
|
|
looptop:
|
|
|
|
|
roll $4, %eax
|
|
|
|
|
movb %al, %bl
|
|
|
|
|
andb $0xf, %bl
|
|
|
|
|
addb '0', %bl
|
|
|
|
|
cmpb '9', %bl
|
|
|
|
|
jle LN_C4
|
|
|
|
|
addb $7, %bl
|
|
|
|
|
LN_C4:
|
|
|
|
|
movb %bl, (%edi)
|
|
|
|
|
addl $2, %edi
|
|
|
|
|
loop looptop
|
|
|
|
|
#wbinvd
|
|
|
|
|
|
|
|
|
|
popl %eax
|
|
|
|
|
popl %ebx
|
|
|
|
|
popl %ecx
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
ClearScreen:
|
|
|
|
|
pushl %eax
|
|
|
|
|
pushl %ecx
|
|
|
|
|
|
|
|
|
|
movb ' ', %al
|
|
|
|
|
movb $0xc, %ah
|
|
|
|
|
movl $0xb8000, %edi
|
|
|
|
|
movl $80*24, %ecx
|
|
|
|
|
LN_C5:
|
|
|
|
|
movw %ax, (%edi)
|
|
|
|
|
addl $2, %edi
|
|
|
|
|
loop LN_C5
|
|
|
|
|
movl $0xb8000, %edi
|
|
|
|
|
|
|
|
|
|
popl %ecx
|
|
|
|
|
popl %eax
|
|
|
|
|
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
|
|
|
|
|
|
