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