1 files changed, 60 insertions, 0 deletions
diff --git a/UefiCpuPkg/ResetVector/Vtf0/X64/PageTables2M.asm b/UefiCpuPkg/ResetVector/Vtf0/X64/PageTables2M.asm
new file mode 100644
index 0000000000..b97df384ac
--- /dev/null
+++ b/UefiCpuPkg/ResetVector/Vtf0/X64/PageTables2M.asm
@@ -0,0 +1,60 @@
+;------------------------------------------------------------------------------
+; @file
+; Emits Page Tables for 1:1 mapping of the addresses 0 - 0x100000000 (4GB)
+;
+; Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;------------------------------------------------------------------------------
+
+BITS    64
+
+%define ALIGN_TOP_TO_4K_FOR_PAGING
+
+%define PAGE_2M_PDE_ATTR (PAGE_SIZE + \
+                          PAGE_ACCESSED + \
+                          PAGE_DIRTY + \
+                          PAGE_READ_WRITE + \
+                          PAGE_PRESENT)
+
+%define PAGE_PDP_ATTR (PAGE_ACCESSED + \
+                       PAGE_READ_WRITE + \
+                       PAGE_PRESENT)
+
+%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 PTE_2MB(x) ((x << 21) + PAGE_2M_PDE_ATTR)
+
+TopLevelPageDirectory:
+
+    ;
+    ; Top level Page Directory Pointers (1 * 512GB entry)
+    ;
+    DQ      PDP(0x1000)
+
+
+    ;
+    ; Next level Page Directory Pointers (4 * 1GB entries => 4GB)
+    ;
+    TIMES 0x1000-PGTBLS_OFFSET($) DB 0
+
+    DQ      PDP(0x2000)
+    DQ      PDP(0x3000)
+    DQ      PDP(0x4000)
+    DQ      PDP(0x5000)
+
+    ;
+    ; Page Table Entries (2048 * 2MB entries => 4GB)
+    ;
+    TIMES 0x2000-PGTBLS_OFFSET($) DB 0
+
+%assign i 0
+%rep    0x800
+    DQ      PTE_2MB(i)
+    %assign i i+1
+%endrep
+
+EndOfPageTables: