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e1f414b6 | 1 | /** @file\r |
2 | AsmReadMsr64 function\r | |
3 | \r | |
373ade0e | 4 | Copyright (c) 2006 - 2008, Intel Corporation<BR>\r |
e1f414b6 | 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 | |
1efcc4ae | 15 | \r |
f734a10a | 16 | \r |
e1f414b6 | 17 | \r |
42eedea9 | 18 | /**\r |
19 | Returns a 64-bit Machine Specific Register(MSR).\r | |
20 | \r | |
21 | Reads and returns the 64-bit MSR specified by Index. No parameter checking is\r | |
22 | performed on Index, and some Index values may cause CPU exceptions. The\r | |
23 | caller must either guarantee that Index is valid, or the caller must set up\r | |
24 | exception handlers to catch the exceptions. This function is only available\r | |
030cd1a2 | 25 | on IA-32 and x64.\r |
42eedea9 | 26 | \r |
27 | @param Index The 32-bit MSR index to read.\r | |
28 | \r | |
29 | @return The value of the MSR identified by Index.\r | |
30 | \r | |
31 | **/\r | |
e1f414b6 | 32 | UINT64\r |
33 | EFIAPI\r | |
34 | AsmReadMsr64 (\r | |
35 | IN UINT32 Index\r | |
36 | )\r | |
37 | {\r | |
38 | _asm {\r | |
39 | mov ecx, Index\r | |
40 | rdmsr\r | |
41 | }\r | |
42 | }\r | |
43 | \r |