MdePkg/Library/BaseLib/X64/WriteMsr64.c

/** @file
  CpuBreakpoint function.

  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

/**
  Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
**/

void __writemsr (unsigned long Register, unsigned __int64 Value);

#pragma intrinsic(__writemsr)

/**
  Write data to MSR.

  @param  Index                The register index of MSR.
  @param  Value                Data wants to be written.

  @return Value written to MSR.

**/
UINT64
EFIAPI
AsmWriteMsr64 (
  IN UINT32  Index,
  IN UINT64  Value
  )
{
  __writemsr (Index, Value);
  return Value;
}