| /** @file | |
| AsmReadMsr64 function | |
| Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
| SPDX-License-Identifier: BSD-2-Clause-Patent | |
| **/ | |
| /** | |
| Returns a 64-bit Machine Specific Register(MSR). | |
| Reads and returns the 64-bit MSR specified by Index. No parameter checking is | |
| performed on Index, and some Index values may cause CPU exceptions. The | |
| caller must either guarantee that Index is valid, or the caller must set up | |
| exception handlers to catch the exceptions. This function is only available | |
| on IA-32 and x64. | |
| @param Index The 32-bit MSR index to read. | |
| @return The value of the MSR identified by Index. | |
| **/ | |
| UINT64 | |
| EFIAPI | |
| AsmReadMsr64 ( | |
| IN UINT32 Index | |
| ) | |
| { | |
| _asm { | |
| mov ecx, Index | |
| rdmsr | |
| } | |
| } | |