1 files changed, 53 insertions, 0 deletions
diff --git a/UefiCpuPkg/ResetVector/Vtf0/X64/PageTables1G.asm b/UefiCpuPkg/ResetVector/Vtf0/X64/PageTables1G.asm
new file mode 100644
index 0000000000..19bd3d5a92
--- /dev/null
+++ b/UefiCpuPkg/ResetVector/Vtf0/X64/PageTables1G.asm
@@ -0,0 +1,53 @@
+;------------------------------------------------------------------------------
+; @file
+; Emits Page Tables for 1:1 mapping of the addresses 0 - 0x8000000000 (512GB)
+;
+; Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+; Linear-Address Translation to a 1-GByte Page
+;
+;------------------------------------------------------------------------------
+
+BITS    64
+
+%define ALIGN_TOP_TO_4K_FOR_PAGING
+
+%define PAGE_PDP_ATTR (PAGE_ACCESSED + \
+                        PAGE_READ_WRITE + \
+                        PAGE_PRESENT)
+
+%define PAGE_PDP_1G_ATTR (PAGE_ACCESSED + \
+                        PAGE_READ_WRITE + \
+                        PAGE_DIRTY + \
+                        PAGE_PRESENT + \
+                        PAGE_SIZE)
+
+%define PGTBLS_OFFSET(x) ((x) - TopLevelPageDirectory)
+%define PGTBLS_ADDR(x) (ADDR_OF(TopLevelPageDirectory) + (x))
+
+%define PDP(offset) (ADDR_OF(TopLevelPageDirectory) + (offset) + \
+                    PAGE_PDP_ATTR)
+
+%define PDP_1G(x) ((x << 30) + PAGE_PDP_1G_ATTR)
+
+ALIGN 16
+
+TopLevelPageDirectory:
+
+    ;
+    ; Top level Page Directory Pointers (1 * 512GB entry)
+    ;
+    DQ      PDP(0x1000)
+
+    TIMES 0x1000-PGTBLS_OFFSET($) DB 0
+    ;
+    ; Next level Page Directory Pointers (512 * 1GB entries => 512GB)
+    ;
+%assign i 0
+%rep      512
+    DQ    PDP_1G(i)
+    %assign i i+1
+%endrep
+    TIMES 0x2000-PGTBLS_OFFSET($) DB 0
+
+EndOfPageTables: