MdePkg/Library/BaseLib/Ia32/DisablePaging32.S

   1 //
   2 // Include common header file for this module.
   3 //
   4 #include "CommonHeader.h"
   5
   6 #------------------------------------------------------------------------------
   7 #
   8 # Copyright (c) 2006, Intel Corporation
   9 # All rights reserved. This program and the accompanying materials
  10 # are licensed and made available under the terms and conditions of the BSD License
  11 # which accompanies this distribution.  The full text of the license may be found at
  12 # http://opensource.org/licenses/bsd-license.php
  13 #
  14 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16 #
  17 # Module Name:
  18 #
  19 #   DisablePaging32.Asm
  20 #
  21 # Abstract:
  22 #
  23 #   InternalX86DisablePaging32 function
  24 #
  25 # Notes:
  26 #
  27 #------------------------------------------------------------------------------
  28
  29 .globl ASM_PFX(InternalX86DisablePaging32)
  30
  31 #------------------------------------------------------------------------------
  32 # VOID
  33 # EFIAPI
  34 # InternalX86DisablePaging32 (
  35 #   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  36 #   IN      VOID                      *Context1,    OPTIONAL
  37 #   IN      VOID                      *Context2,    OPTIONAL
  38 #   IN      VOID                      *NewStack
  39 #   );
  40 #------------------------------------------------------------------------------
  41 ASM_PFX(InternalX86DisablePaging32):
  42     movl    4(%esp), %ebx
  43     movl    8(%esp), %ecx
  44     movl    12(%esp), %edx
  45     pushfl
  46     pop     %edi
  47     cli
  48     movl    %cr0, %eax
  49     btrl    $31, %eax
  50     movl    16(%esp), %esp
  51     movl    %eax, %cr0
  52     push    %edi
  53     popfl
  54     push    %edx
  55     push    %ecx
  56     call    *%ebx
  57     jmp     .