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diff --git a/external/vpc/tier0/cputopology.h b/external/vpc/tier0/cputopology.h
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+//-------------------------------------------------------------------------------------
+// CpuTopology.h
+// 
+// CpuToplogy class declaration.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved.
+//-------------------------------------------------------------------------------------
+#pragma once
+#ifndef CPU_TOPOLOGY_H
+#define CPU_TOPOLOGY_H
+
+#include "winlite.h"
+
+class ICpuTopology;
+
+//---------------------------------------------------------------------------------
+// Name: CpuToplogy
+// Desc: This class constructs a supported cpu topology implementation object on
+//       initialization and forwards calls to it.  This is the Abstraction class
+//       in the traditional Bridge Pattern.
+//---------------------------------------------------------------------------------
+class CpuTopology
+{
+public:
+                CpuTopology( BOOL bForceCpuid = FALSE );
+                ~CpuTopology();
+
+    BOOL        IsDefaultImpl() const;
+    DWORD       NumberOfProcessCores() const;
+    DWORD       NumberOfSystemCores() const;
+    DWORD_PTR   CoreAffinityMask( DWORD coreIdx ) const;
+
+    void        ForceCpuid( BOOL bForce );
+private:
+    void        Destroy_();
+
+    ICpuTopology* m_pImpl;
+};
+
+#endif  // CPU_TOPOLOGY_H