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IntelFsp2Pkg: Add function to get FspInfoHeader before stack is ready

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we need to locate the FSP Info Header before the stack is initialized to
access the cfg region for any UPD. Hence adding the
AsmGetFspInfoHeaderNoStack function to support it.

Note: This function is there in IntelFspPkg but got removed in IntelFsp2Pkg

Cc: Maurice Ma <maurice.ma@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Satya Yarlagadda <satya.p.yarlagadda@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com>
This commit is contained in:
Yarlagadda, Satya P 2016-08-18 13:20:31 +08:00 committed by Jiewen Yao
parent 759be99db5
commit 90fadfc00a
1 changed files with 9 additions and 2 deletions
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11
IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm
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@ -14,6 +14,8 @@
SECTION .text SECTION .text
global ASM_PFX(FspInfoHeaderRelativeOff) global ASM_PFX(FspInfoHeaderRelativeOff)
ASM_PFX(FspInfoHeaderRelativeOff):
DD 0x12345678 ; This value must be patched by the build script
global ASM_PFX(AsmGetFspBaseAddress) global ASM_PFX(AsmGetFspBaseAddress)
ASM_PFX(AsmGetFspBaseAddress): ASM_PFX(AsmGetFspBaseAddress):
@ -29,6 +31,11 @@ ASM_PFX(NextInstruction):
pop eax pop eax
sub eax, ASM_PFX(NextInstruction) sub eax, ASM_PFX(NextInstruction)
add eax, ASM_PFX(AsmGetFspInfoHeader) add eax, ASM_PFX(AsmGetFspInfoHeader)
DB 02Dh ; opcode of sub eax, imm32 sub eax, dword [ASM_PFX(FspInfoHeaderRelativeOff)]
ASM_PFX(FspInfoHeaderRelativeOff): DD 0x12345678 ; sub eax, FspInfoHeaderRelativeOff
ret ret
global ASM_PFX(AsmGetFspInfoHeaderNoStack)
ASM_PFX(AsmGetFspInfoHeaderNoStack):
mov eax, ASM_PFX(AsmGetFspInfoHeader)
sub eax, dword [ASM_PFX(FspInfoHeaderRelativeOff)]
jmp edi