MdePkg/Library/BaseLib/Ia32/EnablePaging32.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006, Intel Corporation
   4 # All rights reserved. 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 #   InternalX86EnablePaging32 function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23
  24 .global _InternalX86EnablePaging32
  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 _InternalX86EnablePaging32:
  37     movl    4(%esp), %ebx
  38     movl    8(%esp), %ecx
  39     movl    12(%esp), %edx
  40     pushfl
  41     pop     %edi
  42     cli
  43     movl    %cr0, %eax
  44     btsl    $31, %eax
  45     movl    16(%esp), %esp
  46     movl    %eax, %cr0
  47     push    %edi
  48     popfl
  49     push    %edx
  50     push    %ecx
  51     call    *%ebx
  52     jmp     .