UefiCpuPkg VTF0 X64: Build page tables in NASM code

[mirror_edk2.git] / UefiCpuPkg / ResetVector / Vtf0 / X64 / PageTables.asm

;------------------------------------------------------------------------------\r
; @file\r
; Emits Page Tables for 1:1 mapping of the addresses 0 - 0x100000000 (4GB)\r
;\r
; Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>\r
; This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;\r
;------------------------------------------------------------------------------\r
\r
BITS    64\r
\r
%define ALIGN_TOP_TO_4K_FOR_PAGING\r
\r
%define PAGE_PRESENT            0x01\r
%define PAGE_READ_WRITE         0x02\r
%define PAGE_USER_SUPERVISOR    0x04\r
%define PAGE_WRITE_THROUGH      0x08\r
%define PAGE_CACHE_DISABLE     0x010\r
%define PAGE_ACCESSED          0x020\r
%define PAGE_DIRTY             0x040\r
%define PAGE_PAT               0x080\r
%define PAGE_GLOBAL           0x0100\r
%define PAGE_2M_MBO            0x080\r
%define PAGE_2M_PAT          0x01000\r
\r
%define PAGE_2M_PDE_ATTR (PAGE_2M_MBO + \\r
                          PAGE_ACCESSED + \\r
                          PAGE_DIRTY + \\r
                          PAGE_READ_WRITE + \\r
                          PAGE_PRESENT)\r
\r
%define PAGE_PDP_ATTR (PAGE_ACCESSED + \\r
                       PAGE_READ_WRITE + \\r
                       PAGE_PRESENT)\r
\r
%define PGTBLS_OFFSET(x) ((x) - TopLevelPageDirectory)\r
%define PGTBLS_ADDR(x) (ADDR_OF(TopLevelPageDirectory) + (x))\r
\r
%define PDP(offset) (ADDR_OF(TopLevelPageDirectory) + (offset) + \\r
                     PAGE_PDP_ATTR)\r
%define PTE_2MB(x) ((x << 21) + PAGE_2M_PDE_ATTR)\r
\r
TopLevelPageDirectory:\r
\r
    ;\r
    ; Top level Page Directory Pointers (1 * 512GB entry)\r
    ;\r
    DQ      PDP(0x1000)\r
\r
\r
    ;\r
    ; Next level Page Directory Pointers (4 * 1GB entries => 4GB)\r
    ;\r
    TIMES 0x1000-PGTBLS_OFFSET($) DB 0\r
\r
    DQ      PDP(0x2000)\r
    DQ      PDP(0x3000)\r
    DQ      PDP(0x4000)\r
    DQ      PDP(0x5000)\r
\r
    ;\r
    ; Page Table Entries (2048 * 2MB entries => 4GB)\r
    ;\r
    TIMES 0x2000-PGTBLS_OFFSET($) DB 0\r
\r
%assign i 0\r
%rep    0x800\r
    DQ      PTE_2MB(i)\r
    %assign i i+1\r
%endrep\r
\r
EndOfPageTables:\r