1 /** @file
2 AsmReadPmc function
3
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 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 Reads the current value of a Performance Counter (PMC).
17
18 Reads and returns the current value of performance counter specified by
19 Index. This function is only available on IA-32 and x64.
20
21 @param Index The 32-bit Performance Counter index to read.
22
23 @return The value of the PMC specified by Index.
24
25 **/
26 UINT64
27 EFIAPI
AsmReadPmc(IN UINT32 Index)28 AsmReadPmc (
29 IN UINT32 Index
30 )
31 {
32 _asm {
33 mov ecx, Index
34 rdpmc
35 }
36 }
37
38