1 files changed, 43 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/ReadMsr64.c b/Core/MdePkg/Library/BaseLib/Ia32/ReadMsr64.c
new file mode 100644
index 0000000000..88ba49de78
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/ReadMsr64.c
@@ -0,0 +1,43 @@
+/** @file
+  AsmReadMsr64 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.
+
+**/
+
+
+
+
+/**
+  Returns a 64-bit Machine Specific Register(MSR).
+
+  Reads and returns the 64-bit MSR specified by Index. No parameter checking is
+  performed on Index, and some Index values may cause CPU exceptions. The
+  caller must either guarantee that Index is valid, or the caller must set up
+  exception handlers to catch the exceptions. This function is only available
+  on IA-32 and x64.
+
+  @param  Index The 32-bit MSR index to read.
+
+  @return The value of the MSR identified by Index.
+
+**/
+UINT64
+EFIAPI
+AsmReadMsr64 (
+  IN UINT32  Index
+  )
+{
+  _asm {
+    mov     ecx, Index
+    rdmsr
+  }
+}
+