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

   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 #   InternalX86DisablePaging32 function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23
  24 #include <EdkIIGlueBase.h>
  25
  26 .globl ASM_PFX(InternalX86DisablePaging32)
  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 ASM_PFX(InternalX86DisablePaging32):
  39     movl    4(%esp), %ebx
  40     movl    8(%esp), %ecx
  41     movl    12(%esp), %edx
  42     pushfl
  43     pop     %edi
  44     cli
  45     movl    %cr0, %eax
  46     btrl    $31, %eax
  47     movl    16(%esp), %esp
  48     movl    %eax, %cr0
  49     push    %edi
  50     popfl
  51     push    %edx
  52     push    %ecx
  53     call    *%ebx
  54     jmp     .