UefiCpuPkg/ResetVector/Vtf0/X64/PageTables.asm

   1 ;------------------------------------------------------------------------------
   2 ; @file
   3 ; Emits Page Tables for 1:1 mapping of the addresses 0 - 0x100000000 (4GB)
   4 ;
   5 ; Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>
   6 ; This program and the accompanying materials
   7 ; are licensed and made available under the terms and conditions of the BSD License
   8 ; which accompanies this distribution.  The full text of the license may be found at
   9 ; http://opensource.org/licenses/bsd-license.php
  10 ;
  11 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 ;
  14 ;------------------------------------------------------------------------------
  15
  16 BITS    64
  17
  18 %define ALIGN_TOP_TO_4K_FOR_PAGING
  19
  20 %define PAGE_PRESENT            0x01
  21 %define PAGE_READ_WRITE         0x02
  22 %define PAGE_USER_SUPERVISOR    0x04
  23 %define PAGE_WRITE_THROUGH      0x08
  24 %define PAGE_CACHE_DISABLE     0x010
  25 %define PAGE_ACCESSED          0x020
  26 %define PAGE_DIRTY             0x040
  27 %define PAGE_PAT               0x080
  28 %define PAGE_GLOBAL           0x0100
  29 %define PAGE_2M_MBO            0x080
  30 %define PAGE_2M_PAT          0x01000
  31
  32 %define PAGE_2M_PDE_ATTR (PAGE_2M_MBO + \
  33                           PAGE_ACCESSED + \
  34                           PAGE_DIRTY + \
  35                           PAGE_READ_WRITE + \
  36                           PAGE_PRESENT)
  37
  38 %define PAGE_PDP_ATTR (PAGE_ACCESSED + \
  39                        PAGE_READ_WRITE + \
  40                        PAGE_PRESENT)
  41
  42 %define PGTBLS_OFFSET(x) ((x) - TopLevelPageDirectory)
  43 %define PGTBLS_ADDR(x) (ADDR_OF(TopLevelPageDirectory) + (x))
  44
  45 %define PDP(offset) (ADDR_OF(TopLevelPageDirectory) + (offset) + \
  46                      PAGE_PDP_ATTR)
  47 %define PTE_2MB(x) ((x << 21) + PAGE_2M_PDE_ATTR)
  48
  49 TopLevelPageDirectory:
  50
  51     ;
  52     ; Top level Page Directory Pointers (1 * 512GB entry)
  53     ;
  54     DQ      PDP(0x1000)
  55
  56
  57     ;
  58     ; Next level Page Directory Pointers (4 * 1GB entries => 4GB)
  59     ;
  60     TIMES 0x1000-PGTBLS_OFFSET($) DB 0
  61
  62     DQ      PDP(0x2000)
  63     DQ      PDP(0x3000)
  64     DQ      PDP(0x4000)
  65     DQ      PDP(0x5000)
  66
  67     ;
  68     ; Page Table Entries (2048 * 2MB entries => 4GB)
  69     ;
  70     TIMES 0x2000-PGTBLS_OFFSET($) DB 0
  71
  72 %assign i 0
  73 %rep    0x800
  74     DQ      PTE_2MB(i)
  75     %assign i i+1
  76 %endrep
  77
  78 EndOfPageTables: