MdePkg/Library/BaseLib/Ia32/ReadMm6.c

   1 /** @file
   2   AsmReadMm6 function
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 /**
  10   Reads the current value of 64-bit MMX Register #6 (MM6).
  11
  12   Reads and returns the current value of MM6. This function is only available
  13   on IA-32 and x64.
  14
  15   @return The current value of MM6.
  16
  17 **/
  18 UINT64
  19 EFIAPI
  20 AsmReadMm6 (
  21   VOID
  22   )
  23 {
  24   _asm {
  25     push    eax
  26     push    eax
  27     movq    [esp], mm6
  28     pop     eax
  29     pop     edx
  30     emms
  31   }
  32 }