MdePkg/Library/BaseLib/Ia32/ReadMm4.c

/** @file
  AsmReadMm4 function

  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/




/**
  Reads the current value of 64-bit MMX Register #4 (MM4).

  Reads and returns the current value of MM4. This function is only available
  on IA-32 and x64.

  @return The current value of MM4.

**/
UINT64
EFIAPI
AsmReadMm4 (
  VOID
  )
{
  _asm {
    push    eax
    push    eax
    movq    [esp], mm4
    pop     eax
    pop     edx
    emms
  }
}