sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Move SmmDebug feature from ASM to C.

Browse Source 
SmmDebug feature is implemented in ASM, which is not easy to maintain.
So we move it to C function.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Kinney, Michael D" <michael.d.kinney@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18946 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Yao, Jiewen
2015-11-25 08:51:15 +00:00
committed by jyao1
parent 0b256fb1dd
commit f45f2d4ad4
5 changed files with 113 additions and 122 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
View File

@@ -34,14 +34,15 @@ PROTECT_MODE_CS EQU 08h
PROTECT_MODE_DS EQU 20h
TSS_SEGMENT EQU 40h
SmiRendezvous PROTO C
SmiRendezvous PROTO C
CpuSmmDebugEntry PROTO C
CpuSmmDebugExit PROTO C
EXTERNDEF gcSmiHandlerTemplate:BYTE
EXTERNDEF gcSmiHandlerSize:WORD
EXTERNDEF gSmiCr3:DWORD
EXTERNDEF gSmiStack:DWORD
EXTERNDEF gSmbase:DWORD
EXTERNDEF FeaturePcdGet (PcdCpuSmmDebug):BYTE
EXTERNDEF FeaturePcdGet (PcdCpuSmmStackGuard):BYTE
EXTERNDEF gSmiHandlerIdtr:FWORD
@@ -151,40 +152,23 @@ gSmiCr3 DD ?
; jmp _SmiHandler ; instruction is not needed
_SmiHandler PROC
cmp FeaturePcdGet (PcdCpuSmmDebug), 0
jz @3
call @1
@1:
pop ebp
mov eax, 80000001h
cpuid
bt edx, 29 ; check cpuid to identify X64 or IA32
lea edi, [ebp - (@1 - _SmiEntryPoint) + 7fc8h]
lea esi, [edi + 4]
jnc @2
add esi, 4
@2:
mov ecx, [esi]
mov edx, [edi]
@5:
mov dr6, ecx
mov dr7, edx ; restore DR6 & DR7 before running C code
@3:
mov ecx, [esp] ; CPU Index
mov ebx, [esp] ; CPU Index
push ecx
mov eax, SmiRendezvous
push ebx
mov eax, CpuSmmDebugEntry
call eax
pop ecx
cmp FeaturePcdGet (PcdCpuSmmDebug), 0
jz @4
push ebx
mov eax, SmiRendezvous
call eax
pop ecx
push ebx
mov eax, CpuSmmDebugExit
call eax
pop ecx
mov ecx, dr6
mov edx, dr7
mov [esi], ecx
mov [edi], edx
@4:
rsm
_SmiHandler ENDP