MdePkg/Library/BaseLib/Ia32/ReadMm1.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

/** @file
  AsmReadMm1 function

  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/


/**
  Reads the current value of 64-bit MMX Register #1 (MM1).

  Reads and returns the current value of MM1. This function is only available
  on IA-32 and x64.

  @return The current value of MM1.

**/
UINT64
EFIAPI
AsmReadMm1 (
  VOID
  )
{
  _asm {
    push    eax
    push    eax
    movq    [esp], mm1
    pop     eax
    pop     edx
    emms
  }
}