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

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / WriteMsr64.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
void __writemsr (unsigned long Register, unsigned __int64 Value);\r
\r
#pragma intrinsic(__writemsr)\r
\r
/**\r
  Write data to MSR.\r
\r
  @param  Index                The register index of MSR.\r
  @param  Value                Data wants to be written.\r
\r
  @return Value written to MSR.\r
\r
**/\r
UINT64\r
EFIAPI\r
AsmWriteMsr64 (\r
  IN UINT32  Index,\r
  IN UINT64  Value\r
  )\r
{\r
  BOOLEAN                           Flag;\r
\r
  Flag = FilterBeforeMsrWrite (Index, &Value);\r
  if (Flag) {\r
    __writemsr (Index, Value);\r
  }\r
  FilterAfterMsrWrite (Index, &Value);\r
\r
  return Value;\r
}\r
\r