EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/DisablePaging32.asm

   1 ; Copyright (c) 2004, Intel Corporation
   2 ; All rights reserved. This program and the accompanying materials
   3 ; are licensed and made available under the terms and conditions of the BSD License
   4 ; which accompanies this distribution.  The full text of the license may be found at
   5 ; http://opensource.org/licenses/bsd-license.php
   6 ;
   7 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   8 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
   9 ;
  10 ; Module Name:
  11 ;
  12 ;   DisablePaging32.Asm
  13 ;
  14 ; Abstract:
  15 ;
  16 ;   AsmDisablePaging32 function
  17 ;
  18 ; Notes:
  19 ;
  20 ;------------------------------------------------------------------------------
  21
  22     .386
  23     .model  flat,C
  24     .code
  25
  26 ;------------------------------------------------------------------------------
  27 ; VOID
  28 ; EFIAPI
  29 ; InternalX86DisablePaging32 (
  30 ;   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  31 ;   IN      VOID                      *Context1,    OPTIONAL
  32 ;   IN      VOID                      *Context2,    OPTIONAL
  33 ;   IN      VOID                      *NewStack
  34 ;   );
  35 ;------------------------------------------------------------------------------
  36 InternalX86DisablePaging32    PROC
  37     mov     ebx, [esp + 4]
  38     mov     ecx, [esp + 8]
  39     mov     edx, [esp + 12]
  40     pushfd
  41     pop     edi                         ; save EFLAGS to edi
  42     cli
  43     mov     eax, cr0
  44     btr     eax, 31
  45     mov     esp, [esp + 16]
  46     mov     cr0, eax
  47     push    edi
  48     popfd                               ; restore EFLAGS from edi
  49     push    edx
  50     push    ecx
  51     call    ebx
  52     jmp     $                           ; EntryPoint() should not return
  53 InternalX86DisablePaging32    ENDP
  54
  55     END