MdePkg/Library/BaseLib/Ia32/WriteMm4.c

   1 /** @file
   2   AsmWriteMm4 function
   3
   4   Copyright (c) 2006 - 2007, 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
  16
  17
  18 /**
  19   Writes the current value of 64-bit MMX Register #4 (MM4).
  20
  21   Writes the current value of MM4. This function is only available on IA32 and
  22   x64.
  23
  24   @param  Value The 64-bit value to write to MM4.
  25
  26 **/
  27 VOID
  28 EFIAPI
  29 AsmWriteMm4 (
  30   IN UINT64   Value
  31   )
  32 {
  33   _asm {
  34     movq    mm4, qword ptr [Value]
  35     emms
  36   }
  37 }