1 files changed, 39 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/X64/ReadMsr64.c b/Core/MdePkg/Library/BaseLib/X64/ReadMsr64.c
new file mode 100644
index 0000000000..343e9246b0
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/X64/ReadMsr64.c
@@ -0,0 +1,39 @@
+/** @file
+  CpuBreakpoint function.
+
+  Copyright (c) 2006 - 2008, 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.
+**/
+
+unsigned __int64 __readmsr (int register);
+
+#pragma intrinsic(__readmsr)
+
+/**
+  Read data to MSR.
+
+  @param  Index                Register index of MSR.
+
+  @return Value read from MSR.
+
+**/
+UINT64
+EFIAPI
+AsmReadMsr64 (
+  IN UINT32  Index
+  )
+{
+  return __readmsr (Index);
+}
+