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IntelFsp2Pkg: Locate FSP Info Header dynamically

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we need to locate the FSP Info Header by calculating offset dynamically to
handle the scenario of FSP component is being rebased to different location.

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: Maurice Ma <maurice.ma@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 2016-08-01 19:41:34 +08:00 committed by Jiewen Yao
parent d54e2d6c1e
commit 8265373e60
1 changed files with 8 additions and 9 deletions
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17
IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm
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@ -14,22 +14,21 @@
SECTION .text SECTION .text
global ASM_PFX(FspInfoHeaderRelativeOff) global ASM_PFX(FspInfoHeaderRelativeOff)
ASM_PFX(FspInfoHeaderRelativeOff):
;
; This value will be pached by the build script
;
DD 0x12345678
global ASM_PFX(AsmGetFspBaseAddress) global ASM_PFX(AsmGetFspBaseAddress)
ASM_PFX(AsmGetFspBaseAddress): ASM_PFX(AsmGetFspBaseAddress):
mov eax, ASM_PFX(AsmGetFspInfoHeader) call ASM_PFX(AsmGetFspInfoHeader)
sub eax, dword [ASM_PFX(FspInfoHeaderRelativeOff)]
add eax, 0x1C add eax, 0x1C
mov eax, dword [eax] mov eax, dword [eax]
ret ret
global ASM_PFX(AsmGetFspInfoHeader) global ASM_PFX(AsmGetFspInfoHeader)
ASM_PFX(AsmGetFspInfoHeader): ASM_PFX(AsmGetFspInfoHeader):
mov eax, ASM_PFX(AsmGetFspInfoHeader) call ASM_PFX(NextInstruction)
sub eax, dword [ASM_PFX(FspInfoHeaderRelativeOff)] ASM_PFX(NextInstruction):
pop eax
sub eax, ASM_PFX(NextInstruction)
add eax, ASM_PFX(AsmGetFspInfoHeader)
DB 02Dh ; opcode of sub eax, imm32
ASM_PFX(FspInfoHeaderRelativeOff): DD 0x12345678 ; sub eax, FspInfoHeaderRelativeOff
ret ret