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UefiCpuPkg/ResetVector:Add Option to reserve 4K region at 4GB

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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4140

Some implementations may need to keep the initial Reset code to be
separated out from rest of the code.This request is to add padding at
lower 4K region below 4 GB which will result having only few jmp
instructions and data at that region.

Reviewed-by: Ray Ni <ray.ni@intel.com>
Signed-off-by: Duggapu Chinni B <chinni.b.duggapu@intel.com>
This commit is contained in:
Duggapu, Chinni B 2022-11-07 14:47:31 +08:00 committed by mergify[bot]
parent 6d55ad9a59
commit b9e702c3c9
1 changed files with 9 additions and 1 deletions
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10
UefiCpuPkg/ResetVector/Vtf0/Ia16/ResetVectorVtf0.asm
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@ -21,7 +21,15 @@ ALIGN 16
; located just below 0x100000000 (4GB) in the firmware device. ; located just below 0x100000000 (4GB) in the firmware device.
; ;
%ifdef ALIGN_TOP_TO_4K_FOR_PAGING %ifdef ALIGN_TOP_TO_4K_FOR_PAGING
TIMES (0x1000 - ($ - EndOfPageTables) - 0x20) DB 0 TIMES (0x1000 - ($ - EndOfPageTables)) DB 0
;
; Pad the VTF0 Reset code for Bsp & Ap to 4k aligned block.
; Some implementations may need to keep the initial Reset code
; to be separated out from rest of the code.
; This padding will make sure lower 4K region below 4 GB may
; only contains few jmp instructions and data.
;
TIMES (0x1000 - 0x20) DB 0
%endif %endif
applicationProcessorEntryPoint: applicationProcessorEntryPoint: