MdePkg/Library/BaseLib/X64/WriteMsr64.c

   1 /** @file
   2   CpuBreakpoint function.
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #if _MSC_EXTENSIONS
  16
  17 //
  18 // Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics
  19 //
  20 void __writemsr (unsigned long Register, unsigned __int64 Value);
  21
  22 #pragma intrinsic(__writemsr)
  23
  24 UINT64
  25 EFIAPI
  26 AsmWriteMsr64 (
  27   IN UINT32  Index,
  28   IN UINT64  Value
  29   )
  30 {
  31   __writemsr (Index, Value);
  32   return Value;
  33 }
  34
  35 #endif