diff options
| author | bxing <bxing@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-01-10 06:57:04 +0000 |
|---|---|---|
| committer | bxing <bxing@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-01-10 06:57:04 +0000 |
| commit | a9a812a0ed4ab3d83941fdc6da281aebdb9bb296 (patch) | |
| tree | 869ad144d2c1dcd96d859a9ac4c40617dfc96588 /MdePkg/Library/BaseLib/X64/DisablePaging64.asm | |
| parent | 741fb364170375f89aa9c29488cc402db07a3776 (diff) | |
| download | edk2-platforms-a9a812a0ed4ab3d83941fdc6da281aebdb9bb296.tar.xz | |
1. Added comments to ASM files
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
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/DisablePaging64.asm')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/DisablePaging64.asm | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/MdePkg/Library/BaseLib/X64/DisablePaging64.asm b/MdePkg/Library/BaseLib/X64/DisablePaging64.asm index 2609c941aa..518137ddc9 100644 --- a/MdePkg/Library/BaseLib/X64/DisablePaging64.asm +++ b/MdePkg/Library/BaseLib/X64/DisablePaging64.asm @@ -36,15 +36,14 @@ ;------------------------------------------------------------------------------
InternalX86DisablePaging64 PROC
cli
- shl rcx, 32
+ shl rcx, 32 ; rcx[32..47] <- Cs
lea eax, @F
- mov ecx, eax
- push rcx
- mov ebx, edx
mov esi, r8d
+ or rcx, rax ; rcx[0..47] <- Cs:@F
mov edi, r9d
- mov eax, [rsp + 28h]
- retf
+ mov eax, [rsp + 28h] ; eax <- New Stack
+ push rcx
+ retf ; switch to compatibility mode
@@:
mov esp, eax ; set up new stack
mov rax, cr0
@@ -57,10 +56,10 @@ InternalX86DisablePaging64 PROC mov rax, cr4
and al, NOT (1 SHL 5) ; clear PAE
mov cr4, rax
- push rdi
- push rsi
- call rbx
- jmp $
+ push rdi ; push Context2
+ push rsi ; push Context1
+ call rdx ; transfer control to EntryPoint
+ hlt ; no one should get here
InternalX86DisablePaging64 ENDP
END
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