MdePkg/Baseib: Filter/trace MSR access for IA32/X64

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / ReadMsr64.c

/** @file\r
  CpuBreakpoint function.\r
\r
  Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
/**\r
  Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.\r
**/\r
\r
#include <Library/RegisterFilterLib.h>\r
\r
unsigned __int64 __readmsr (int register);\r
\r
#pragma intrinsic(__readmsr)\r
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/**\r
  Read data to MSR.\r
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  @param  Index                Register index of MSR.\r
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  @return Value read from MSR.\r
\r
**/\r
UINT64\r
EFIAPI\r
AsmReadMsr64 (\r
  IN UINT32  Index\r
  )\r
{\r
  UINT64                            Value;\r
  BOOLEAN                           Flag;\r
\r
  Flag = FilterBeforeMsrRead (Index, &Value);\r
  if (Flag) {\r
    Value = __readmsr (Index);\r
  }\r
  FilterAfterMsrRead (Index, &Value);\r
\r
  return Value;\r
}\r
\r