sravan/system76-edk2
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1. Added comments to ASM files

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2. Fixed a bug in 64-bit AsmDisablePaging64(), which may cause a #GP exception.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2206 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
bxing
2007-01-10 06:57:04 +00:00
parent 741fb36417
commit a9a812a0ed
45 changed files with 184 additions and 77 deletions
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20
MdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.asm
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@@ -36,13 +36,13 @@ EXTERN InternalMathDivRemU64x32:PROC
; );
;------------------------------------------------------------------------------
InternalMathDivRemU64x64 PROC
mov ecx, [esp + 16]
mov ecx, [esp + 16] ; ecx <- divisor[32..63]
test ecx, ecx
jnz _@DivRemU64x64 ; call _@DivRemU64x64 if Divisor > 2^32
mov ecx, [esp + 20]
jecxz @F
and dword ptr [ecx + 4], 0
mov [esp + 16], ecx
and dword ptr [ecx + 4], 0 ; zero high dword of remainder
mov [esp + 16], ecx ; set up stack frame to match DivRemU64x32
@@:
jmp InternalMathDivRemU64x32
InternalMathDivRemU64x64 ENDP
@@ -61,11 +61,11 @@ _@DivRemU64x64 PROC USES ebx esi edi
jnz @B
div ebx
mov ebx, eax ; ebx <- quotient
mov ecx, [esp + 28]
mul dword ptr [esp + 24]
imul ecx, ebx
add edx, ecx
mov ecx, dword ptr [esp + 32]
mov ecx, [esp + 28] ; ecx <- high dword of divisor
mul dword ptr [esp + 24] ; edx:eax <- quotient * divisor[0..31]
imul ecx, ebx ; ecx <- quotient * divisor[32..63]
add edx, ecx ; edx <- (quotient * divisor)[32..63]
mov ecx, dword ptr [esp + 32] ; ecx <- addr for Remainder
jc @TooLarge ; product > 2^64
cmp edi, edx ; compare high 32 bits
ja @Correct
@@ -76,7 +76,7 @@ _@DivRemU64x64 PROC USES ebx esi edi
dec ebx ; adjust quotient by -1
jecxz @Return ; return if Remainder == NULL
sub eax, dword ptr [esp + 24]
sbb edx, dword ptr [esp + 28]
sbb edx, dword ptr [esp + 28] ; edx:eax <- (quotient - 1) * divisor
@Correct:
jecxz @Return
sub esi, eax
@@ -85,7 +85,7 @@ _@DivRemU64x64 PROC USES ebx esi edi
mov [ecx + 4], edi
@Return:
mov eax, ebx ; eax <- quotient
xor edx, edx
xor edx, edx ; quotient is 32 bits long
ret
_@DivRemU64x64 ENDP