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OvmfPkg/ResetVector: add CreatePageTables4Level macro 

Move code to create 4-level 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: <20240301074402.98625-4-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 08:43:55 +01:00 committed by mergify[bot]
parent 52e44713d2
commit 4329b5b0cd
1 changed files with 39 additions and 31 deletions
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70
OvmfPkg/ResetVector/Ia32/PageTables64.asm
View File

@ -63,6 +63,44 @@ BITS 32
loop .clearPageTablesMemoryLoop
%endmacro
;
; Create page tables for 4-level paging
;
; Argument: upper 32 bits of the page table entries
;
%macro CreatePageTables4Level 1
;
; Top level Page Directory Pointers (1 * 512GB entry)
;
mov dword[PT_ADDR (0)], PT_ADDR (0x1000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (4)], %1
;
; Next level Page Directory Pointers (4 * 1GB entries => 4GB)
;
mov dword[PT_ADDR (0x1000)], PT_ADDR (0x2000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x1004)], %1
mov dword[PT_ADDR (0x1008)], PT_ADDR (0x3000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x100C)], %1
mov dword[PT_ADDR (0x1010)], PT_ADDR (0x4000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x1014)], %1
mov dword[PT_ADDR (0x1018)], PT_ADDR (0x5000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x101C)], %1
;
; Page Table Entries (2048 * 2MB entries => 4GB)
;
mov ecx, 0x800
.pageTableEntriesLoop4Level:
mov eax, ecx
dec eax
shl eax, 21
add eax, PAGE_PDE_LARGEPAGE_ATTR
mov dword[ecx * 8 + PT_ADDR (0x2000 - 8)], eax
mov dword[(ecx * 8 + PT_ADDR (0x2000 - 8)) + 4], %1
loop .pageTableEntriesLoop4Level
%endmacro
;
; Modified: EAX, EBX, ECX, EDX
;
@ -88,37 +126,7 @@ SetCr3ForPageTables64:
ClearOvmfPageTables:
ClearOvmfPageTables
;
; Top level Page Directory Pointers (1 * 512GB entry)
;
mov dword[PT_ADDR (0)], PT_ADDR (0x1000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (4)], edx
;
; Next level Page Directory Pointers (4 * 1GB entries => 4GB)
;
mov dword[PT_ADDR (0x1000)], PT_ADDR (0x2000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x1004)], edx
mov dword[PT_ADDR (0x1008)], PT_ADDR (0x3000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x100C)], edx
mov dword[PT_ADDR (0x1010)], PT_ADDR (0x4000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x1014)], edx
mov dword[PT_ADDR (0x1018)], PT_ADDR (0x5000) + PAGE_PDE_DIRECTORY_ATTR
mov dword[PT_ADDR (0x101C)], edx
;
; Page Table Entries (2048 * 2MB entries => 4GB)
;
mov ecx, 0x800
pageTableEntriesLoop:
mov eax, ecx
dec eax
shl eax, 21
add eax, PAGE_PDE_LARGEPAGE_ATTR
mov [ecx * 8 + PT_ADDR (0x2000 - 8)], eax
mov [(ecx * 8 + PT_ADDR (0x2000 - 8)) + 4], edx
loop pageTableEntriesLoop
CreatePageTables4Level edx
; Clear the C-bit from the GHCB page if the SEV-ES is enabled.
OneTimeCall SevClearPageEncMaskForGhcbPage