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diff --git a/UefiCpuPkg/Include/Register/Msr/PentiumMsr.h b/UefiCpuPkg/Include/Register/Msr/PentiumMsr.h
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+/** @file
+  MSR Definitions for Pentium Processors.
+
+  Provides defines for Machine Specific Registers(MSR) indexes. Data structures
+  are provided for MSRs that contain one or more bit fields.  If the MSR value
+  returned is a single 32-bit or 64-bit value, then a data structure is not
+  provided for that MSR.
+
+  Copyright (c) 2016, 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.
+
+  @par Specification Reference:
+  Intel(R) 64 and IA-32 Architectures Software Developer's Manual, Volume 3,
+  December 2015, Chapter 35 Model-Specific-Registers (MSR), Section 35-20.
+
+**/
+
+#ifndef __PENTIUM_MSR_H__
+#define __PENTIUM_MSR_H__
+
+#include <Register/ArchitecturalMsr.h>
+
+/**
+  See Section 15.10.2, "Pentium Processor Machine-Check Exception Handling.".
+
+  @param  ECX  MSR_PENTIUM_P5_MC_ADDR (0x00000000)
+  @param  EAX  Lower 32-bits of MSR value.
+  @param  EDX  Upper 32-bits of MSR value.
+
+  <b>Example usage</b>
+  @code
+  UINT64  Msr;
+
+  Msr = AsmReadMsr64 (MSR_PENTIUM_P5_MC_ADDR);
+  AsmWriteMsr64 (MSR_PENTIUM_P5_MC_ADDR, Msr);
+  @endcode
+**/
+#define MSR_PENTIUM_P5_MC_ADDR                   0x00000000
+
+
+/**
+  See Section 15.10.2, "Pentium Processor Machine-Check Exception Handling.".
+
+  @param  ECX  MSR_PENTIUM_P5_MC_TYPE (0x00000001)
+  @param  EAX  Lower 32-bits of MSR value.
+  @param  EDX  Upper 32-bits of MSR value.
+
+  <b>Example usage</b>
+  @code
+  UINT64  Msr;
+
+  Msr = AsmReadMsr64 (MSR_PENTIUM_P5_MC_TYPE);
+  AsmWriteMsr64 (MSR_PENTIUM_P5_MC_TYPE, Msr);
+  @endcode
+**/
+#define MSR_PENTIUM_P5_MC_TYPE                   0x00000001
+
+
+/**
+  See Section 17.14, "Time-Stamp Counter.".
+
+  @param  ECX  MSR_PENTIUM_TSC (0x00000010)
+  @param  EAX  Lower 32-bits of MSR value.
+  @param  EDX  Upper 32-bits of MSR value.
+
+  <b>Example usage</b>
+  @code
+  UINT64  Msr;
+
+  Msr = AsmReadMsr64 (MSR_PENTIUM_TSC);
+  AsmWriteMsr64 (MSR_PENTIUM_TSC, Msr);
+  @endcode
+**/
+#define MSR_PENTIUM_TSC                          0x00000010
+
+
+/**
+  See Section 18.20.1, "Control and Event Select Register (CESR).".
+
+  @param  ECX  MSR_PENTIUM_CESR (0x00000011)
+  @param  EAX  Lower 32-bits of MSR value.
+  @param  EDX  Upper 32-bits of MSR value.
+
+  <b>Example usage</b>
+  @code
+  UINT64  Msr;
+
+  Msr = AsmReadMsr64 (MSR_PENTIUM_CESR);
+  AsmWriteMsr64 (MSR_PENTIUM_CESR, Msr);
+  @endcode
+**/
+#define MSR_PENTIUM_CESR                         0x00000011
+
+
+/**
+  Section 18.20.3, "Events Counted.".
+
+  @param  ECX  MSR_PENTIUM_CTRn
+  @param  EAX  Lower 32-bits of MSR value.
+  @param  EDX  Upper 32-bits of MSR value.
+
+  <b>Example usage</b>
+  @code
+  UINT64  Msr;
+
+  Msr = AsmReadMsr64 (MSR_PENTIUM_CTR0);
+  AsmWriteMsr64 (MSR_PENTIUM_CTR0, Msr);
+  @endcode
+  @{
+**/
+#define MSR_PENTIUM_CTR0                         0x00000012
+#define MSR_PENTIUM_CTR1                         0x00000013
+/// @}
+
+#endif