sravan/system76-edk2
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Modified coding style, removed unnecessary comments and "offset" key words.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1033 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
bxing
2006-07-17 09:38:46 +00:00
parent fa2da5b1c1
commit bbe4ba8149
2 changed files with 53 additions and 60 deletions
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56
MdePkg/Library/BaseLib/Ia32/Thunk16.asm
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@@ -29,10 +29,6 @@ EXTERNDEF C m16Gdt:WORD
EXTERNDEF C m16GdtrBase:WORD
EXTERNDEF C mTransition:WORD
;THUNK_ATTRIBUTE_BIG_REAL_MODE EQU 1
;THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 EQU 2
;THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL EQU 4
IA32_REGS STRUC 4t
_EDI DD ?
_ESI DD ?
@@ -54,19 +50,19 @@ IA32_REGS ENDS
.const
m16Size DW offset InternalAsmThunk16 - offset m16Start
mThunk16Attr DW offset _ThunkAttr - offset m16Start
m16Gdt DW offset _NullSegDesc - offset m16Start
m16GdtrBase DW offset _16GdtrBase - offset m16Start
mTransition DW offset _EntryPoint - offset m16Start
m16Size DW InternalAsmThunk16 - m16Start
mThunk16Attr DW _ThunkAttr - m16Start
m16Gdt DW _NullSegDesc - m16Start
m16GdtrBase DW _16GdtrBase - m16Start
mTransition DW _EntryPoint - m16Start
.code
m16Start LABEL BYTE
SavedGdt LABEL FWORD
DW ?
DD ?
SavedGdt LABEL FWORD
DW ?
DD ?
_BackFromUserCode PROC
push ss
@@ -106,7 +102,7 @@ _ThunkAttr DD ?
SavedCr4 DD ?
mov cr4, eax
DB 66h
lgdt fword ptr cs:[edi + (offset SavedGdt - offset @Base)]
lgdt fword ptr cs:[edi + (SavedGdt - @Base)]
DB 66h, 0b8h ; mov eax, imm32
SavedCr0 DD ?
mov cr0, eax
@@ -119,12 +115,12 @@ SavedEsp DD ?
retf ; return to protected mode
_BackFromUserCode ENDP
_EntryPoint DD offset _ToUserCode - offset m16Start
DW 8h
_16Idtr FWORD (1 SHL 10) - 1
_16Gdtr LABEL FWORD
DW offset GdtEnd - offset _NullSegDesc - 1
_16GdtrBase DD offset _NullSegDesc
_EntryPoint DD _ToUserCode - m16Start
DW 8h
_16Idtr FWORD (1 SHL 10) - 1
_16Gdtr LABEL FWORD
DW GdtEnd - _NullSegDesc - 1
_16GdtrBase DD _NullSegDesc
_ToUserCode PROC
mov edx, ss
@@ -140,17 +136,17 @@ _ToUserCode PROC
DB 66h
call @Base ; push eip
@Base:
pop bp ; ebp <- offset @Base
pop bp ; ebp <- address of @Base
DB 67h ; address size override
push [esp + sizeof (IA32_REGS) + 2]
lea eax, [esi + (offset @RealMode - offset @Base)]
lea eax, [esi + (@RealMode - @Base)]
push eax
retf
@RealMode:
mov cs:[esi + (offset SavedSs - offset @Base)], edx
mov cs:[esi + (offset SavedEsp - offset @Base)], bx
mov cs:[esi + (SavedSs - @Base)], edx
mov cs:[esi + (SavedEsp - @Base)], bx
DB 66h
lidt fword ptr cs:[esi + (offset _16Idtr - offset @Base)]
lidt fword ptr cs:[esi + (_16Idtr - @Base)]
popaw ; popad actually
pop ds
pop es
@@ -196,26 +192,26 @@ InternalAsmThunk16 PROC USES ebp ebx esi edi ds es fs gs
rep movsd ; copy RegSet
mov eax, [esp + 40] ; eax <- address of transition code
mov esi, edx ; esi <- 16-bit stack segment
lea edx, [eax + (offset SavedCr0 - offset m16Start)]
lea edx, [eax + (SavedCr0 - m16Start)]
mov ecx, eax
and ecx, 0fh
shl eax, 12
lea ecx, [ecx + (offset _BackFromUserCode - offset m16Start)]
lea ecx, [ecx + (_BackFromUserCode - m16Start)]
mov ax, cx
stosd ; [edi] <- return address of user code
sgdt fword ptr [edx + (offset SavedGdt - offset SavedCr0)]
sgdt fword ptr [edx + (SavedGdt - SavedCr0)]
sidt fword ptr [esp + 36] ; save IDT stack in argument space
mov eax, cr0
mov [edx], eax ; save CR0 in SavedCr0
and eax, 7ffffffeh ; clear PE, PG bits
mov ebp, cr4
mov [edx + (offset SavedCr4 - offset SavedCr0)], ebp
mov [edx + (SavedCr4 - SavedCr0)], ebp
and ebp, 300h ; clear all but PCE and OSFXSR bits
push 10h
pop ecx ; ecx <- selector for data segments
lgdt fword ptr [edx + (offset _16Gdtr - offset SavedCr0)]
lgdt fword ptr [edx + (_16Gdtr - SavedCr0)]
pushfd
call fword ptr [edx + (offset _EntryPoint - offset SavedCr0)]
call fword ptr [edx + (_EntryPoint - SavedCr0)]
popfd
lidt fword ptr [esp + 36] ; restore protected mode IDTR
lea eax, [ebp - sizeof (IA32_REGS)]