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SourceLevelDebugPkg/DebugAgent: Support IA32 processors without DE or FXSAVE/FXRESTOR

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Use CPUID Leaf 01 to detect support for debug extensions and FXSAVE/FXRESTOR instructions.
Do not enable those features in CR4 if they are not supported.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17220 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Michael Kinney
2015-04-27 19:53:36 +00:00
committed by mdkinney
parent ef530fe71f
commit 5f72e68c90
7 changed files with 71 additions and 14 deletions
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26
SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.asm
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@ -230,9 +230,21 @@ NoExtrPush:
;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
;; insure FXSAVE/FXRSTOR is enabled in CR4...
;; ... while we're at it, make sure DE is also enabled...
mov eax, 1
push ebx ; temporarily save value of ebx on stack
cpuid ; use CPUID to determine if FXSAVE/FXRESTOR and
; DE are supported
pop ebx ; retore value of ebx that was overwritten by CPUID
mov eax, cr4
push eax ; push cr4 firstly
or eax, 208h
push eax ; push cr4 firstly
test edx, BIT24 ; Test for FXSAVE/FXRESTOR support
jz @F
or eax, BIT9 ; Set CR4.OSFXSR
@@:
test edx, BIT2 ; Test for Debugging Extensions support
jz @F
or eax, BIT3 ; Set CR4.DE
@@:
mov cr4, eax
mov eax, cr3
push eax
@ -313,7 +325,12 @@ NoExtrPush:
mov ecx, 128 ;= 512 / 4
rep stosd
mov edi, esp
test edx, BIT24 ; Test for FXSAVE/FXRESTOR support.
; edx still contains result from CPUID above
jz @F
db 0fh, 0aeh, 00000111y ;fxsave [edi]
@@:
;; save the exception data
push dword ptr [ebp + 8]
@ -329,7 +346,12 @@ NoExtrPush:
;; FX_SAVE_STATE_IA32 FxSaveState;
mov esi, esp
mov eax, 1
cpuid ; use CPUID to determine if FXSAVE/FXRESTOR are supported
test edx, BIT24 ; Test for FXSAVE/FXRESTOR support
jz @F
db 0fh, 0aeh, 00001110y ; fxrstor [esi]
@@:
add esp, 512
;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;