diff --git a/UefiCpuPkg/Include/Register/LocalApic.h b/UefiCpuPkg/Include/Register/LocalApic.h
index f49e8f542f..cf335a69d9 100644
--- a/UefiCpuPkg/Include/Register/LocalApic.h
+++ b/UefiCpuPkg/Include/Register/LocalApic.h
@@ -1,7 +1,7 @@
 /** @file
   IA32 Local APIC Definitions.
 
-  Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2010 - 2015, 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
@@ -25,7 +25,11 @@
 //
 #define CPUID_SIGNATURE                         0x0
 #define CPUID_VERSION_INFO                      0x1
+#define CPUID_CACHE_PARAMS                      0x4
 #define CPUID_EXTENDED_TOPOLOGY                 0xB
+#define   CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_INVALID 0x0
+#define   CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_SMT     0x1
+#define   CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_CORE    0x2
 #define CPUID_EXTENDED_FUNCTION                 0x80000000
 #define CPUID_VIR_PHY_ADDRESS_SIZE              0x80000008