MdePkg/Library/BaseLib/X64/WriteMsr64.c

   1 /** @file
   2   CpuBreakpoint function.
   3
   4   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 /**
  10   Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
  11 **/
  12
  13 void __writemsr (unsigned long Register, unsigned __int64 Value);
  14
  15 #pragma intrinsic(__writemsr)
  16
  17 /**
  18   Write data to MSR.
  19
  20   @param  Index                The register index of MSR.
  21   @param  Value                Data wants to be written.
  22
  23   @return Value written to MSR.
  24
  25 **/
  26 UINT64
  27 EFIAPI
  28 AsmWriteMsr64 (
  29   IN UINT32  Index,
  30   IN UINT64  Value
  31   )
  32 {
  33   __writemsr (Index, Value);
  34   return Value;
  35 }
  36