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/** @file
AsmReadMsr64 function
Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/RegisterFilterLib.h>
/**
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
AsmReadMsr64Internal (
IN UINT32 Index
)
{
_asm {
mov ecx, Index
rdmsr
}
}
/**
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
)
{
UINT64 Value;
BOOLEAN Flag;
Flag = FilterBeforeMsrRead (Index, &Value);
if (Flag) {
Value = AsmReadMsr64Internal (Index);
}
FilterAfterMsrRead (Index, &Value);
return Value;
}
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