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1 | /** @file\r | |
2 | AsmReadMsr64 function\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | \r | |
10 | \r | |
11 | \r | |
12 | /**\r | |
13 | Returns a 64-bit Machine Specific Register(MSR).\r | |
14 | \r | |
15 | Reads and returns the 64-bit MSR specified by Index. No parameter checking is\r | |
16 | performed on Index, and some Index values may cause CPU exceptions. The\r | |
17 | caller must either guarantee that Index is valid, or the caller must set up\r | |
18 | exception handlers to catch the exceptions. This function is only available\r | |
19 | on IA-32 and x64.\r | |
20 | \r | |
21 | @param Index The 32-bit MSR index to read.\r | |
22 | \r | |
23 | @return The value of the MSR identified by Index.\r | |
24 | \r | |
25 | **/\r | |
26 | UINT64\r | |
27 | EFIAPI\r | |
28 | AsmReadMsr64 (\r | |
29 | IN UINT32 Index\r | |
30 | )\r | |
31 | {\r | |
32 | _asm {\r | |
33 | mov ecx, Index\r | |
34 | rdmsr\r | |
35 | }\r | |
36 | }\r | |
37 | \r |