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diff --git a/PcAtChipsetPkg/Include/Register/Hpet.h b/PcAtChipsetPkg/Include/Register/Hpet.h
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+++ b/PcAtChipsetPkg/Include/Register/Hpet.h
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+/** @file
+  HPET register definitions from the IA-PC HPET (High Precision Event Timers) 
+  Specification, Revision 1.0a, October 2004.
+
+  Copyright (c) 2011, 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.
+
+**/
+
+#ifndef __HPET_REGISTER_H__
+#define __HPET_REGISTER_H__
+
+///
+/// HPET General Register Offsets
+///
+#define HPET_GENERAL_CAPABILITIES_ID_OFFSET   0x000
+#define HPET_GENERAL_CONFIGURATION_OFFSET     0x010
+#define HPET_GENERAL_INTERRUPT_STATUS_OFFSET  0x020
+
+///
+/// HPET Timer Register Offsets
+///
+#define HPET_MAIN_COUNTER_OFFSET              0x0F0
+#define HPET_TIMER_CONFIGURATION_OFFSET       0x100
+#define HPET_TIMER_COMPARATOR_OFFSET          0x108
+#define HPET_TIMER_MSI_ROUTE_OFFSET           0x110
+
+///
+/// Stride between sets of HPET Timer Registers
+///
+#define HPET_TIMER_STRIDE         0x20
+
+#pragma pack(1)
+
+///
+/// HPET General Capabilities and ID Register
+///
+typedef union {
+  struct {
+    UINT32  Revision:8;
+    UINT32  NumberOfTimers:5;
+    UINT32  CounterSize:1;
+    UINT32  Reserved0:1;
+    UINT32  LegacyRoute:1;
+    UINT32  VendorId:16;
+    UINT32  CounterClockPeriod:32;
+  } Bits;
+  UINT64  Uint64;
+} HPET_GENERAL_CAPABILITIES_ID_REGISTER;
+
+///
+/// HPET General Configuration Register
+///
+typedef union {
+  struct {
+    UINT32  MainCounterEnable:1;
+    UINT32  LegacyRouteEnable:1;
+    UINT32  Reserved0:30;
+    UINT32  Reserved1:32;
+  } Bits;
+  UINT64  Uint64;
+} HPET_GENERAL_CONFIGURATION_REGISTER;
+
+///
+/// HPET Timer Configuration Register
+///
+typedef union {
+  struct {
+    UINT32  Reserved0:1;
+    UINT32  LevelTriggeredInterrupt:1;
+    UINT32  InterruptEnable:1;
+    UINT32  PeriodicInterruptEnable:1;
+    UINT32  PeriodicInterruptCapablity:1;
+    UINT32  CounterSizeCapablity:1;
+    UINT32  ValueSetEnable:1;
+    UINT32  Reserved1:1;
+    UINT32  CounterSizeEnable:1;
+    UINT32  InterruptRoute:5;
+    UINT32  MsiInterruptEnable:1;
+    UINT32  MsiInterruptCapablity:1;
+    UINT32  Reserved2:16;
+    UINT32  InterruptRouteCapability;
+  } Bits;
+  UINT64  Uint64;
+} HPET_TIMER_CONFIGURATION_REGISTER;
+
+///
+/// HPET Timer MSI Route Register
+///
+typedef union {
+  struct {
+    UINT32  Value:32;
+    UINT32  Address:32;
+  } Bits;
+  UINT64  Uint64;
+} HPET_TIMER_MSI_ROUTE_REGISTER;
+
+#pragma pack()
+
+#endif