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[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / WriteCr4.c

/** @file\r
  AsmWriteCr4 function\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
\r
\r
\r
/**\r
  Writes a value to Control Register 4 (CR4).\r
\r
  Writes and returns a new value to CR4. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Cr4 The value to write to CR4.\r
\r
  @return The value written to CR4.\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteCr4 (\r
  UINTN  Value\r
  )\r
{\r
  _asm {\r
    mov     eax, Value\r
    _emit  0x0f  // mov  cr4, eax\r
    _emit  0x22\r
    _emit  0xE0\r
  }\r
}\r
\r