diff options
| -rw-r--r-- | OvmfPkg/ResetVector/Ia32/PageTables64.asm | 70 |
1 files changed, 39 insertions, 31 deletions
diff --git a/OvmfPkg/ResetVector/Ia32/PageTables64.asm b/OvmfPkg/ResetVector/Ia32/PageTables64.asm index 378ba2feeb..14cc2c33aa 100644 --- a/OvmfPkg/ResetVector/Ia32/PageTables64.asm +++ b/OvmfPkg/ResetVector/Ia32/PageTables64.asm @@ -64,6 +64,44 @@ BITS 32 %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
;
SetCr3ForPageTables64:
@@ -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
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