MdePkg/Library/BaseLib/Ia32/EnablePaging64.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation
   4 ; All rights reserved. This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   EnablePaging64.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   AsmEnablePaging64 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .686p
  25     .model  flat,C
  26     .code
  27
  28 InternalX86EnablePaging64 PROC
  29     cli
  30     mov     [esp], @F                   ; offset for far retf
  31     mov     eax, cr4
  32     or      al, (1 SHL 5)
  33     mov     cr4, eax                    ; enable PAE
  34     mov     ecx, 0c0000080h
  35     rdmsr
  36     or      ah, 1                       ; set LME
  37     wrmsr
  38     mov     eax, cr0
  39     bts     eax, 31
  40     mov     cr0, eax                    ; enable paging
  41     retf
  42 @@:                                     ; long mode starts here
  43     DB      67h, 48h
  44     mov     ebx, [esp]                  ; mov rbx, [esp]
  45     DB      67h, 48h
  46     mov     ecx, [esp + 8]              ; mov rcx, [esp + 8]
  47     DB      67h, 48h
  48     mov     edx, [esp + 10h]            ; mov rdx, [esp + 10h]
  49     DB      67h, 48h
  50     mov     esp, [esp + 18h]            ; mov rsp, [esp + 18h]
  51     DB      48h
  52     add     esp, -20h                   ; add rsp, -20h
  53     call    ebx                         ; call rbx
  54     jmp     $
  55 InternalX86EnablePaging64 ENDP
  56
  57     END