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Modified coding style, removed unnecessary comments and "offset" key words. 

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
View File

@ -29,10 +29,6 @@ EXTERNDEF C m16Gdt:WORD
EXTERNDEF C m16GdtrBase:WORD EXTERNDEF C m16GdtrBase:WORD
EXTERNDEF C mTransition: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 IA32_REGS STRUC 4t
_EDI DD ? _EDI DD ?
_ESI DD ? _ESI DD ?
@ -54,19 +50,19 @@ IA32_REGS ENDS
.const .const
m16Size DW offset InternalAsmThunk16 - offset m16Start m16Size DW InternalAsmThunk16 - m16Start
mThunk16Attr DW offset _ThunkAttr - offset m16Start mThunk16Attr DW _ThunkAttr - m16Start
m16Gdt DW offset _NullSegDesc - offset m16Start m16Gdt DW _NullSegDesc - m16Start
m16GdtrBase DW offset _16GdtrBase - offset m16Start m16GdtrBase DW _16GdtrBase - m16Start
mTransition DW offset _EntryPoint - offset m16Start mTransition DW _EntryPoint - m16Start
.code .code
m16Start LABEL BYTE m16Start LABEL BYTE
SavedGdt LABEL FWORD SavedGdt LABEL FWORD
DW ? DW ?
DD ? DD ?
_BackFromUserCode PROC _BackFromUserCode PROC
push ss push ss
@ -106,7 +102,7 @@ _ThunkAttr DD ?
SavedCr4 DD ? SavedCr4 DD ?
mov cr4, eax mov cr4, eax
DB 66h DB 66h
lgdt fword ptr cs:[edi + (offset SavedGdt - offset @Base)] lgdt fword ptr cs:[edi + (SavedGdt - @Base)]
DB 66h, 0b8h ; mov eax, imm32 DB 66h, 0b8h ; mov eax, imm32
SavedCr0 DD ? SavedCr0 DD ?
mov cr0, eax mov cr0, eax
@ -119,12 +115,12 @@ SavedEsp DD ?
retf ; return to protected mode retf ; return to protected mode
_BackFromUserCode ENDP _BackFromUserCode ENDP
_EntryPoint DD offset _ToUserCode - offset m16Start _EntryPoint DD _ToUserCode - m16Start
DW 8h DW 8h
_16Idtr FWORD (1 SHL 10) - 1 _16Idtr FWORD (1 SHL 10) - 1
_16Gdtr LABEL FWORD _16Gdtr LABEL FWORD
DW offset GdtEnd - offset _NullSegDesc - 1 DW GdtEnd - _NullSegDesc - 1
_16GdtrBase DD offset _NullSegDesc _16GdtrBase DD _NullSegDesc
_ToUserCode PROC _ToUserCode PROC
mov edx, ss mov edx, ss
@ -140,17 +136,17 @@ _ToUserCode PROC
DB 66h DB 66h
call @Base ; push eip call @Base ; push eip
@Base: @Base:
pop bp ; ebp <- offset @Base pop bp ; ebp <- address of @Base
DB 67h ; address size override DB 67h ; address size override
push [esp + sizeof (IA32_REGS) + 2] push [esp + sizeof (IA32_REGS) + 2]
lea eax, [esi + (offset @RealMode - offset @Base)] lea eax, [esi + (@RealMode - @Base)]
push eax push eax
retf retf
@RealMode: @RealMode:
mov cs:[esi + (offset SavedSs - offset @Base)], edx mov cs:[esi + (SavedSs - @Base)], edx
mov cs:[esi + (offset SavedEsp - offset @Base)], bx mov cs:[esi + (SavedEsp - @Base)], bx
DB 66h DB 66h
lidt fword ptr cs:[esi + (offset _16Idtr - offset @Base)] lidt fword ptr cs:[esi + (_16Idtr - @Base)]
popaw ; popad actually popaw ; popad actually
pop ds pop ds
pop es pop es
@ -196,26 +192,26 @@ InternalAsmThunk16 PROC USES ebp ebx esi edi ds es fs gs
rep movsd ; copy RegSet rep movsd ; copy RegSet
mov eax, [esp + 40] ; eax <- address of transition code mov eax, [esp + 40] ; eax <- address of transition code
mov esi, edx ; esi <- 16-bit stack segment mov esi, edx ; esi <- 16-bit stack segment
lea edx, [eax + (offset SavedCr0 - offset m16Start)] lea edx, [eax + (SavedCr0 - m16Start)]
mov ecx, eax mov ecx, eax
and ecx, 0fh and ecx, 0fh
shl eax, 12 shl eax, 12
lea ecx, [ecx + (offset _BackFromUserCode - offset m16Start)] lea ecx, [ecx + (_BackFromUserCode - m16Start)]
mov ax, cx mov ax, cx
stosd ; [edi] <- return address of user code 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 sidt fword ptr [esp + 36] ; save IDT stack in argument space
mov eax, cr0 mov eax, cr0
mov [edx], eax ; save CR0 in SavedCr0 mov [edx], eax ; save CR0 in SavedCr0
and eax, 7ffffffeh ; clear PE, PG bits and eax, 7ffffffeh ; clear PE, PG bits
mov ebp, cr4 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 and ebp, 300h ; clear all but PCE and OSFXSR bits
push 10h push 10h
pop ecx ; ecx <- selector for data segments pop ecx ; ecx <- selector for data segments
lgdt fword ptr [edx + (offset _16Gdtr - offset SavedCr0)] lgdt fword ptr [edx + (_16Gdtr - SavedCr0)]
pushfd pushfd
call fword ptr [edx + (offset _EntryPoint - offset SavedCr0)] call fword ptr [edx + (_EntryPoint - SavedCr0)]
popfd popfd
lidt fword ptr [esp + 36] ; restore protected mode IDTR lidt fword ptr [esp + 36] ; restore protected mode IDTR
lea eax, [ebp - sizeof (IA32_REGS)] lea eax, [ebp - sizeof (IA32_REGS)]

57
MdePkg/Library/BaseLib/X64/Thunk16.asm
View File

@ -26,9 +26,6 @@ EXTERNDEF m16Gdt:WORD
EXTERNDEF m16GdtrBase:WORD EXTERNDEF m16GdtrBase:WORD
EXTERNDEF mTransition:WORD EXTERNDEF mTransition:WORD
;THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 EQU 2
;THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL EQU 4
IA32_REGS STRUC 4t IA32_REGS STRUC 4t
_EDI DD ? _EDI DD ?
_ESI DD ? _ESI DD ?
@ -50,19 +47,19 @@ IA32_REGS ENDS
.const .const
m16Size DW offset InternalAsmThunk16 - offset m16Start m16Size DW InternalAsmThunk16 - m16Start
mThunk16Attr DW offset _ThunkAttr - offset m16Start mThunk16Attr DW _ThunkAttr - m16Start
m16Gdt DW offset _NullSegDesc - offset m16Start m16Gdt DW _NullSegDesc - m16Start
m16GdtrBase DW offset _16GdtrBase - offset m16Start m16GdtrBase DW _16GdtrBase - m16Start
mTransition DW offset _EntryPoint - offset m16Start mTransition DW _EntryPoint - m16Start
.code .code
m16Start LABEL BYTE m16Start LABEL BYTE
SavedGdt LABEL FWORD SavedGdt LABEL FWORD
DW ? DW ?
DQ ? DQ ?
_BackFromUserCode PROC _BackFromUserCode PROC
DB 16h ; push ss DB 16h ; push ss
@ -103,7 +100,7 @@ _ThunkAttr DD ?
SavedCr4 DD ? SavedCr4 DD ?
mov cr4, rax mov cr4, rax
DB 66h, 2eh DB 66h, 2eh
lgdt fword ptr [rdi + (offset SavedGdt - offset @Base)] lgdt fword ptr [rdi + (SavedGdt - @Base)]
DB 66h DB 66h
mov ecx, 0c0000080h mov ecx, 0c0000080h
rdmsr rdmsr
@ -121,12 +118,12 @@ SavedEsp DD ?
retf ; return to protected mode retf ; return to protected mode
_BackFromUserCode ENDP _BackFromUserCode ENDP
_EntryPoint DD offset _ToUserCode - offset m16Start _EntryPoint DD _ToUserCode - m16Start
DW 8h DW 8h
_16Gdtr LABEL FWORD _16Gdtr LABEL FWORD
DW offset GdtEnd - offset _NullSegDesc - 1 DW GdtEnd - _NullSegDesc - 1
_16GdtrBase DQ offset _NullSegDesc _16GdtrBase DQ _NullSegDesc
_16Idtr FWORD (1 SHL 10) - 1 _16Idtr FWORD (1 SHL 10) - 1
_ToUserCode PROC _ToUserCode PROC
mov edi, ss mov edi, ss
@ -147,18 +144,18 @@ _ToUserCode PROC
DB 66h DB 66h
call @Base ; push eip call @Base ; push eip
@Base: @Base:
pop bp ; ebp <- offset @Base pop bp ; ebp <- address of @Base
push [esp + sizeof (IA32_REGS) + 2] push [esp + sizeof (IA32_REGS) + 2]
lea eax, [rsi + (offset @RealMode - offset @Base)] lea eax, [rsi + (@RealMode - @Base)]
push rax push rax
retf retf
@RealMode: @RealMode:
DB 2eh ; cs: DB 2eh ; cs:
mov [rsi + (offset SavedSs - offset @Base)], edi mov [rsi + (SavedSs - @Base)], edi
DB 2eh ; cs: DB 2eh ; cs:
mov [rsi + (offset SavedEsp - offset @Base)], bx mov [rsi + (SavedEsp - @Base)], bx
DB 66h, 2eh ; CS and operand size override DB 66h, 2eh ; CS and operand size override
lidt fword ptr [rsi + (offset _16Idtr - offset @Base)] lidt fword ptr [rsi + (_16Idtr - @Base)]
DB 66h, 61h ; popad DB 66h, 61h ; popad
DB 1fh ; pop ds DB 1fh ; pop ds
DB 07h ; pop es DB 07h ; pop es
@ -202,22 +199,22 @@ InternalAsmThunk16 PROC USES rbp rbx rsi rdi
mov edi, (IA32_REGS ptr [rsi])._ESP mov edi, (IA32_REGS ptr [rsi])._ESP
lea rdi, [edi - (sizeof (IA32_REGS) + 4)] lea rdi, [edi - (sizeof (IA32_REGS) + 4)]
imul eax, r8d, 16 ; eax <- r8d(stack segment) * 16 imul eax, r8d, 16 ; eax <- r8d(stack segment) * 16
mov ebx, edi ; ebx <- stack offset for 16-bit code mov ebx, edi ; ebx <- stack for 16-bit code
push sizeof (IA32_REGS) / 4 push sizeof (IA32_REGS) / 4
add edi, eax ; edi <- linear address of 16-bit stack add edi, eax ; edi <- linear address of 16-bit stack
pop rcx pop rcx
rep movsd ; copy RegSet rep movsd ; copy RegSet
lea ecx, [rdx + (offset SavedCr4 - offset m16Start)] lea ecx, [rdx + (SavedCr4 - m16Start)]
mov eax, edx ; eax <- transition code address mov eax, edx ; eax <- transition code address
and edx, 0fh and edx, 0fh
shl eax, 12 shl eax, 12
lea edx, [rdx + (offset _BackFromUserCode - offset m16Start)] lea edx, [rdx + (_BackFromUserCode - m16Start)]
mov ax, dx mov ax, dx
stosd ; [edi] <- return address of user code stosd ; [edi] <- return address of user code
sgdt fword ptr [rcx + (offset SavedGdt - offset SavedCr4)] sgdt fword ptr [rcx + (SavedGdt - SavedCr4)]
sidt fword ptr [rsp + 38h] ; save IDT stack in argument space sidt fword ptr [rsp + 38h] ; save IDT stack in argument space
mov rax, cr0 mov rax, cr0
mov [rcx + (offset SavedCr0 - offset SavedCr4)], eax mov [rcx + (SavedCr0 - SavedCr4)], eax
and eax, 7ffffffeh ; clear PE, PG bits and eax, 7ffffffeh ; clear PE, PG bits
mov rbp, cr4 mov rbp, cr4
mov [rcx], ebp ; save CR4 in SavedCr4 mov [rcx], ebp ; save CR4 in SavedCr4
@ -225,9 +222,9 @@ InternalAsmThunk16 PROC USES rbp rbx rsi rdi
mov esi, r8d ; esi <- 16-bit stack segment mov esi, r8d ; esi <- 16-bit stack segment
push 10h push 10h
pop rdx ; rdx <- selector for data segments pop rdx ; rdx <- selector for data segments
lgdt fword ptr [rcx + (offset _16Gdtr - offset SavedCr4)] lgdt fword ptr [rcx + (_16Gdtr - SavedCr4)]
pushfq pushfq
call fword ptr [rcx + (offset _EntryPoint - offset SavedCr4)] call fword ptr [rcx + (_EntryPoint - SavedCr4)]
popfq popfq
lidt fword ptr [rsp + 38h] ; restore protected mode IDTR lidt fword ptr [rsp + 38h] ; restore protected mode IDTR
lea eax, [rbp - sizeof (IA32_REGS)] lea eax, [rbp - sizeof (IA32_REGS)]