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 #   AsmEnablePaging32 function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23
  24
  25
  26
  27
  28 #------------------------------------------------------------------------------
  29 # VOID
  30 # EFIAPI
  31 # AsmEnablePaging32 (
  32 #   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  33 #   IN      VOID                      *Context1,    OPTIONAL
  34 #   IN      VOID                      *Context2,    OPTIONAL
  35 #   IN      VOID                      *NewStack
  36 #   );
  37 #------------------------------------------------------------------------------
  38 .global _AsmEnablePaging32
  39 _AsmEnablePaging32:
  40     movl    4(%esp),%ebx
  41     movl    8(%esp),%ecx
  42     movl    12(%esp),%edx
  43     pushfl
  44     popl    %edi
  45     cli
  46     movl    %cr0, %eax
  47     btsl    $31,%eax
  48     movl    16(%esp),%esp
  49     movl    %eax, %cr0
  50     pushl   %edi
  51     popfl
  52     pushl   %edx
  53     pushl   %ecx
  54     call    *%ebx
  55     jmp     .
  56
  57
  58