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 __declspec (naked)
  16 VOID
  17 EFIAPI
  18 InternalX86EnablePaging32 (
  19   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  20   IN      VOID                      *Context1,    OPTIONAL
  21   IN      VOID                      *Context2,    OPTIONAL
  22   IN      VOID                      *NewStack
  23   )
  24 {
  25   _asm {
  26     push    ebp
  27     mov     ebp, esp
  28     mov     ebx, EntryPoint
  29     mov     ecx, Context1
  30     mov     edx, Context2
  31     pushfd
  32     pop     edi
  33     cli
  34     mov     eax, cr0
  35     bts     eax, 31
  36     mov     esp, NewStack
  37     mov     cr0, eax
  38     push    edi
  39     popfd
  40     push    edx
  41     push    ecx
  42     call    ebx
  43     jmp     $
  44   }
  45 }
  46