MdePkg/Library/BaseLib/Ia32/DisablePaging32.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php.
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   DisablePaging32.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   AsmDisablePaging32 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .386
  25     .model  flat,C
  26     .code
  27
  28 ;------------------------------------------------------------------------------
  29 ; VOID
  30 ; EFIAPI
  31 ; InternalX86DisablePaging32 (
  32 ;   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  33 ;   IN      VOID                      *Context1,    OPTIONAL
  34 ;   IN      VOID                      *Context2,    OPTIONAL
  35 ;   IN      VOID                      *NewStack
  36 ;   );
  37 ;------------------------------------------------------------------------------
  38 InternalX86DisablePaging32    PROC
  39     mov     ebx, [esp + 4]
  40     mov     ecx, [esp + 8]
  41     mov     edx, [esp + 12]
  42     pushfd
  43     pop     edi                         ; save EFLAGS to edi
  44     cli
  45     mov     eax, cr0
  46     btr     eax, 31
  47     mov     esp, [esp + 16]
  48     mov     cr0, eax
  49     push    edi
  50     popfd                               ; restore EFLAGS from edi
  51     push    edx
  52     push    ecx
  53     call    ebx
  54     jmp     $                           ; EntryPoint() should not return
  55 InternalX86DisablePaging32    ENDP
  56
  57     END