MdePkg/Library/BaseLib/Ia32/EnablePaging32.c

   1 /** @file
   2   AsmEnablePaging32 function
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 //
  16 // Include common header file for this module.
  17 //
  18 #include "CommonHeader.h"
  19
  20 __declspec (naked)
  21 VOID
  22 EFIAPI
  23 InternalX86EnablePaging32 (
  24   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  25   IN      VOID                      *Context1,    OPTIONAL
  26   IN      VOID                      *Context2,    OPTIONAL
  27   IN      VOID                      *NewStack
  28   )
  29 {
  30   _asm {
  31     push    ebp
  32     mov     ebp, esp
  33     mov     ebx, EntryPoint
  34     mov     ecx, Context1
  35     mov     edx, Context2
  36     pushfd
  37     pop     edi
  38     cli
  39     mov     eax, cr0
  40     bts     eax, 31
  41     mov     esp, NewStack
  42     mov     cr0, eax
  43     push    edi
  44     popfd
  45     push    edx
  46     push    ecx
  47     call    ebx
  48     jmp     $
  49   }
  50 }
  51