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1 | /** @file\r | |
2 | AsmReadTsc function\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2007, Intel Corporation<BR>\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | //\r | |
16 | // Include common header file for this module.\r | |
17 | //\r | |
18 | \r | |
19 | \r | |
20 | /**\r | |
21 | Reads the current value of Time Stamp Counter (TSC).\r | |
22 | \r | |
23 | Reads and returns the current value of TSC. This function is only available\r | |
24 | on IA-32 and X64.\r | |
25 | \r | |
26 | @return The current value of TSC\r | |
27 | \r | |
28 | **/\r | |
29 | UINT64\r | |
30 | EFIAPI\r | |
31 | AsmReadTsc (\r | |
32 | VOID\r | |
33 | )\r | |
34 | {\r | |
35 | _asm {\r | |
36 | rdtsc\r | |
37 | }\r | |
38 | }\r | |
39 | \r |