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diff --git a/PcAtChipsetPkg/Include/Register/IoApic.h b/PcAtChipsetPkg/Include/Register/IoApic.h
new file mode 100644
index 0000000000..d6e73be92b
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+++ b/PcAtChipsetPkg/Include/Register/IoApic.h
@@ -0,0 +1,86 @@
+/** @file
+  I/O APIC Register Definitions from 82093AA I/O Advanced Programmable Interrupt 
+  Controller (IOAPIC), 1996.
+  
+  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 __IO_APIC_H__
+#define __IO_APIC_H__
+
+///
+/// I/O APIC Register Offsets
+///
+#define IOAPIC_INDEX_OFFSET  0x00
+#define IOAPIC_DATA_OFFSET   0x10
+
+///
+/// I/O APIC Indirect Register Indexes
+///
+#define IO_APIC_IDENTIFICATION_REGISTER_INDEX  0x00
+#define IO_APIC_VERSION_REGISTER_INDEX         0x01
+#define IO_APIC_REDIRECTION_TABLE_ENTRY_INDEX  0x10
+
+///
+/// I/O APIC Interrupt Deliver Modes
+///
+#define IO_APIC_DELIVERY_MODE_FIXED            0
+#define IO_APIC_DELIVERY_MODE_LOWEST_PRIORITY  1
+#define IO_APIC_DELIVERY_MODE_SMI              2
+#define IO_APIC_DELIVERY_MODE_NMI              4
+#define IO_APIC_DELIVERY_MODE_INIT             5
+#define IO_APIC_DELIVERY_MODE_EXTINT           7
+
+#pragma pack(1)
+
+typedef union {
+  struct {
+    UINT32  Reserved0:24;
+    UINT32  Identification:4;
+    UINT32  Reserved1:4;
+  } Bits;
+  UINT32  Uint32;
+} IO_APIC_IDENTIFICATION_REGISTER;
+
+typedef union {
+  struct {
+    UINT32  Version:8;
+    UINT32  Reserved0:8;
+    UINT32  MaximumRedirectionEntry:8;
+    UINT32  Reserved1:8;
+  } Bits;
+  UINT32  Uint32;
+} IO_APIC_VERSION_REGISTER;
+
+typedef union {
+  struct {
+    UINT32  Vector:          8;
+    UINT32  DeliveryMode:    3;
+    UINT32  DestinationMode: 1;
+    UINT32  DeliveryStatus:  1;
+    UINT32  Polarity:        1;
+    UINT32  RemoteIRR:       1;
+    UINT32  TriggerMode:     1;
+    UINT32  Mask:            1;
+    UINT32  Reserved0:       15;
+    UINT32  Reserved1:       24;
+    UINT32  DestinationID:   8;
+  } Bits;
+  struct {
+    UINT32  Low;
+    UINT32  High;
+  } Uint32;
+  UINT64  Uint64;
+} IO_APIC_REDIRECTION_TABLE_ENTRY;
+
+#pragma pack()
+
+#endif