MdePkg/Library/BaseLib/Ia32/WriteCr4.c

   1 /** @file
   2   AsmWriteCr4 function
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #if _MSC_EXTENSIONS
  16
  17 UINTN
  18 EFIAPI
  19 AsmWriteCr4 (
  20   UINTN  Value
  21   )
  22 {
  23   _asm {
  24     mov     eax, Value
  25     _emit  0x0f  // mov  cr4, eax
  26     _emit  0x22
  27     _emit  0xE0
  28   }
  29 }
  30
  31 #endif