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 <[email protected]> Cc: Jiewen Yao <[email protected]> Cc: Giri P Mudusuru <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Satya Yarlagadda <[email protected]> --- IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm b/IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm index 43eac97..a848dcb 100644 --- a/IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm +++ b/IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm @@ -14,6 +14,8 @@ SECTION .text global ASM_PFX(FspInfoHeaderRelativeOff) +ASM_PFX(FspInfoHeaderRelativeOff): + DD 0x12345678 ; This value must be patched by the build script global ASM_PFX(AsmGetFspBaseAddress) ASM_PFX(AsmGetFspBaseAddress): @@ -29,6 +31,11 @@ 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 + sub eax, dword [ASM_PFX(FspInfoHeaderRelativeOff)] ret + +global ASM_PFX(AsmGetFspInfoHeaderNoStack) +ASM_PFX(AsmGetFspInfoHeaderNoStack): + mov eax, ASM_PFX(AsmGetFspInfoHeader) + sub eax, dword [ASM_PFX(FspInfoHeaderRelativeOff)] + jmp edi -- 2.9.2.windows.1 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
