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OvmfPkg/ResetVector: add ClearOvmfPageTables macro 

Move code to clear the page tables to a nasm macro.
No functional change.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20240301074402.98625-3-kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Oliver Steffen <osteffen@redhat.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
[lersek@redhat.com: turn the "Cc:" message headers from Gerd's on-list
 posting into "Cc:" tags in the commit message, in order to pacify
 "PatchCheck.py"]
This commit is contained in:
Gerd Hoffmann 2024-03-01 08:43:54 +01:00 committed by mergify[bot]
parent fded08e744
commit 52e44713d2
1 changed files with 19 additions and 16 deletions
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35
OvmfPkg/ResetVector/Ia32/PageTables64.asm
View File

@ -45,6 +45,24 @@ BITS 32
%define TDX_BSP 1
%define TDX_AP 2
;
; For OVMF, build some initial page tables at
; PcdOvmfSecPageTablesBase - (PcdOvmfSecPageTablesBase + 0x6000).
;
; This range should match with PcdOvmfSecPageTablesSize which is
; declared in the FDF files.
;
; At the end of PEI, the pages tables will be rebuilt into a
; more permanent location by DxeIpl.
;
%macro ClearOvmfPageTables 0
mov ecx, 6 * 0x1000 / 4
xor eax, eax
.clearPageTablesMemoryLoop:
mov dword[ecx * 4 + PT_ADDR (0) - 4], eax
loop .clearPageTablesMemoryLoop
%endmacro
;
; Modified: EAX, EBX, ECX, EDX
;
@ -69,22 +87,7 @@ SetCr3ForPageTables64:
OneTimeCall GetSevCBitMaskAbove31
ClearOvmfPageTables:
;
; For OVMF, build some initial page tables at
; PcdOvmfSecPageTablesBase - (PcdOvmfSecPageTablesBase + 0x6000).
;
; This range should match with PcdOvmfSecPageTablesSize which is
; declared in the FDF files.
;
; At the end of PEI, the pages tables will be rebuilt into a
; more permanent location by DxeIpl.
;
mov ecx, 6 * 0x1000 / 4
xor eax, eax
clearPageTablesMemoryLoop:
mov dword[ecx * 4 + PT_ADDR (0) - 4], eax
loop clearPageTablesMemoryLoop
ClearOvmfPageTables
;
; Top level Page Directory Pointers (1 * 512GB entry)