MdePkg/Library/BaseLib/X64/ReadMsr64.c

   1 /** @file
   2   CpuBreakpoint function.
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   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 /**
  16   Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
  17 **/
  18
  19 unsigned __int64 __readmsr (int register);
  20
  21 #pragma intrinsic(__readmsr)
  22
  23 /**
  24   Read data to MSR.
  25
  26   @param  Index                Register index of MSR.
  27
  28   @return Value read from MSR.
  29
  30 **/
  31 UINT64
  32 EFIAPI
  33 AsmReadMsr64 (
  34   IN UINT32  Index
  35   )
  36 {
  37   return __readmsr (Index);
  38 }
  39