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 <BaseLibInternals.h>
  19
  20 #if _MSC_EXTENSIONS
  21
  22 __declspec (naked)
  23 VOID
  24 EFIAPI
  25 InternalX86EnablePaging32 (
  26   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  27   IN      VOID                      *Context1,    OPTIONAL
  28   IN      VOID                      *Context2,    OPTIONAL
  29   IN      VOID                      *NewStack
  30   )
  31 {
  32   _asm {
  33     push    ebp
  34     mov     ebp, esp
  35     mov     ebx, EntryPoint
  36     mov     ecx, Context1
  37     mov     edx, Context2
  38     pushfd
  39     pop     edi
  40     cli
  41     mov     eax, cr0
  42     bts     eax, 31
  43     mov     esp, NewStack
  44     mov     cr0, eax
  45     push    edi
  46     popfd
  47     push    edx
  48     push    ecx
  49     call    ebx
  50     jmp     $
  51   }
  52 }
  53
  54 #endif