MdePkg/Library/BaseLib/Ia32/EnablePaging32.nasm

   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 ;   EnablePaging32.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   AsmEnablePaging32 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     SECTION .text
  25
  26 ;------------------------------------------------------------------------------
  27 ; VOID
  28 ; EFIAPI
  29 ; InternalX86EnablePaging32 (
  30 ;   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  31 ;   IN      VOID                      *Context1,    OPTIONAL
  32 ;   IN      VOID                      *Context2,    OPTIONAL
  33 ;   IN      VOID                      *NewStack
  34 ;   );
  35 ;------------------------------------------------------------------------------
  36 global ASM_PFX(InternalX86EnablePaging32)
  37 ASM_PFX(InternalX86EnablePaging32):
  38     mov     ebx, [esp + 4]
  39     mov     ecx, [esp + 8]
  40     mov     edx, [esp + 12]
  41     pushfd
  42     pop     edi                         ; save flags in edi
  43     cli
  44     mov     eax, cr0
  45     bts     eax, 31
  46     mov     esp, [esp + 16]
  47     mov     cr0, eax
  48     push    edi
  49     popfd                               ; restore flags
  50     push    edx
  51     push    ecx
  52     call    ebx
  53     jmp     $
  54