1 /** @file
2 AsmReadTsc 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
17
18 /**
19 Reads the current value of Time Stamp Counter (TSC).
20
21 Reads and returns the current value of TSC. This function is only available
22 on IA-32 and x64.
23
24 @return The current value of TSC
25
26 **/
27 UINT64
28 EFIAPI
AsmReadTsc(VOID)29 AsmReadTsc (
30 VOID
31 )
32 {
33 _asm {
34 rdtsc
35 }
36 }
37
38