EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/EnablePaging32.c

   1 /**
   2   AsmEnablePaging32 function
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
   5   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 #include "BaseLibInternals.h"
  16
  17 __declspec (naked)
  18 VOID
  19 EFIAPI
  20 InternalX86EnablePaging32 (
  21   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  22   IN      VOID                      *Context1,    OPTIONAL
  23   IN      VOID                      *Context2,    OPTIONAL
  24   IN      VOID                      *NewStack
  25   )
  26 {
  27   _asm {
  28     push    ebp
  29     mov     ebp, esp
  30     mov     ebx, EntryPoint
  31     mov     ecx, Context1
  32     mov     edx, Context2
  33     pushfd
  34     pop     edi
  35     cli
  36     mov     eax, cr0
  37     bts     eax, 31
  38     mov     esp, NewStack
  39     mov     cr0, eax
  40     push    edi
  41     popfd
  42     push    edx
  43     push    ecx
  44     call    ebx
  45     jmp     $
  46   }
  47 }
  48