diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm')
| -rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm deleted file mode 100644 index 0a796ed236..0000000000 --- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm +++ /dev/null @@ -1,209 +0,0 @@ -;*****************************************************************************
-;*
-;* Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
-;* 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.
-;*
-;* Module Name:
-;*
-;* Thunk.asm
-;*
-;* Abstract:
-;*
-;* Real mode thunk
-;*
-;*****************************************************************************
-
- .686p
-
-EXTERNDEF C mCode16Size:DWORD
-
-CONST SEGMENT FLAT "DATA" READONLY
-
-mCode16Size DD _TEXT16SIZE
-
-CONST ENDS
-
-_DATA SEGMENT FLAT "DATA"
-
-NullSegSel DQ 0
-_16BitCsSel LABEL QWORD
- DW -1
- DW 0
- DB 0
- DB 9bh
- DB 8fh ; 16-bit segment
- DB 0
-_16BitSsSel LABEL QWORD
- DW -1
- DW 0
- DB 0
- DB 93h
- DB 8fh ; 16-bit segment
- DB 0
-
-_16Gdtr LABEL FWORD
- DW $ - offset NullSegSel - 1
- DD offset NullSegSel
-
-_DATA ENDS
-
-_TEXT SEGMENT FLAT "CODE" PARA
-
-STACK_PARAM_SIZE EQU 16
-
-IA32_REGS STRUC 4t
-_EDI DD ?
-_ESI DD ?
-_EBP DD ?
-_ESP DD ?
-_EBX DD ?
-_EDX DD ?
-_ECX DD ?
-_EAX DD ?
-_DS DW ?
-_ES DW ?
-_FS DW ?
-_GS DW ?
-_EFLAGS DD ?
-_EIP DD ?
-_CS DW ?
-_SS DW ?
-IA32_REGS ENDS
-
-_STK16 STRUC 1t
-RetEip DD ?
-RetCs DW ?
-ThunkFlags DW ?
-SavedEsp DD ?
-SavedSs DW ?
-SavedGdtr FWORD ?
-SavedCr0 DD ?
-SavedCr4 DD ?
-_STK16 ENDS
-
- ASSUME ds:_DATA
-
-__Thunk16 PROC USES ebp ebx esi edi ds es fs gs
- ASSUME esi:PTR IA32_REGS
- mov esi, [esp + 36]
- movzx edx, [esi]._SS
- mov edi, [esi]._ESP
- add edi, - sizeof (_STK16) - sizeof (IA32_REGS)
- push edi ; save stack offset
- imul eax, edx, 16 ; eax <- edx*16
- add edi, eax ; edi <- linear address of 16-bit stack
- push sizeof (IA32_REGS) / 4
- pop ecx
- rep movsd ; copy context to 16-bit stack
-
- ; copy eflags to stack frame
- mov eax, [esi - sizeof(IA32_REGS)]._EFLAGS
- mov [edi - sizeof(IA32_REGS) - STACK_PARAM_SIZE - 4], eax
-
- pop ebx ; ebx <- 16-bit stack offset
- mov eax, offset @F ; return offset
- stosd
- mov eax, cs ; return segment
- stosw
- mov eax, [esp + 40] ; THUNK flags
- stosw
- mov eax, esp
- stosd ; save esp
- mov eax, ss ; save ss
- stosw
- sgdt fword ptr [edi] ; save GDTR
- sidt fword ptr [esp + 36] ; save IDTR
- mov esi, cr0
- mov [edi + 6], esi ; save CR0
- and esi, NOT 80000001h ; esi <- CR0 to set
- mov eax, cr4
- mov [edi + 10], eax ; save CR4
- and al, NOT 30h ; clear PAE & PSE
- mov edi, edx ; edi <- 16-bit stack segment
- mov edx, [esp + 44]
- shl edx, 16
- push edx
- pop edx
- mov dx, _16BitSsSel - NullSegSel
- lgdt _16Gdtr ; load 16-bit GDTR
- DB 0eah
- DD offset @16Bit
- DW _16BitCsSel - NullSegSel ; jmp far 8:@16Bit
-@16Bit:
- mov ss, dx
- mov cr0, esi ; disable protected mode
- mov cr4, eax ; disable PAE & PSE
- db 67h, 0FFh, 06Ch, 024h, 0FCh ; jmp dword ptr [esp-4]
-@@:
- xor eax, eax
- mov ax, ss
- shl eax, 4
- add eax, esp ; eax <- address of 16-bit stack
- lss esp, fword ptr (_STK16 ptr [esp + sizeof (IA32_REGS)]).SavedEsp
- lidt fword ptr [esp + 36] ; restore IDTR
- ret
-__Thunk16 ENDP
-
-_TEXT ENDS
-
-_TEXT16 SEGMENT USE16 "CODE" PARA
-
-_Code16Addr PROC C
-_Code16Addr ENDP
-
-RealMode PROC
- mov ss, di ; set up stack
- mov esp, ebx
- lidt fword ptr cs:[_16Idtr - _Code16Addr]
- popad
- pop ds
- pop es
- pop fs
- pop gs
- sub esp, (sizeof(IA32_REGS) - 12) + STACK_PARAM_SIZE + 4
- popfd
- test (_STK16 ptr [esp + STACK_PARAM_SIZE + sizeof(IA32_REGS)]).ThunkFlags, 1
- jz @F
- pushf ; push Flags when it's INT#
-@@:
- push cs
-; push @FarCallRet - _Code16Addr
- DB 68h ; push /iw
- DW @FarCallRet - _Code16Addr
- jz @F
- jmp fword ptr [esp + 6 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]
-@@:
- jmp fword ptr [esp + 4 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]
-@FarCallRet:
- add esp, (sizeof(IA32_REGS) - 12) + STACK_PARAM_SIZE + 4
- pushfd
- push gs
- push fs
- push es
- push ds
- pushad
- cli
- DB 66h
- lgdt (_STK16 ptr [esp + sizeof (IA32_REGS)]).SavedGdtr
- mov eax, (_STK16 ptr [esp + sizeof (IA32_REGS)]).SavedCr4
- mov cr4, eax
- mov eax, (_STK16 ptr [esp + sizeof (IA32_REGS)]).SavedCr0
- mov cr0, eax ; restore CR0
- jmp fword ptr (_STK16 ptr [esp + sizeof (IA32_REGS)]).RetEip
-RealMode ENDP
-
-_16Idtr FWORD (1 SHL 10) - 1
-
-_TEXT16END:
-
-_TEXT16SIZE = _TEXT16END - _Code16Addr
-
-_TEXT16 ENDS
-
- END
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