MdePkg/Library/BaseLib/X64/ReadMsr64.c

   1 /** @file
   2   CpuBreakpoint function.
   3
   4   Copyright (c) 2006 - 2008, 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 unsigned __int64 __readmsr (int register);
  14
  15 #pragma intrinsic(__readmsr)
  16
  17 /**
  18   Read data to MSR.
  19
  20   @param  Index                Register index of MSR.
  21
  22   @return Value read from MSR.
  23
  24 **/
  25 UINT64
  26 EFIAPI
  27 AsmReadMsr64 (
  28   IN UINT32  Index
  29   )
  30 {
  31   return __readmsr (Index);
  32 }
  33