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diff --git a/tier0/pmc360.cpp b/tier0/pmc360.cpp
new file mode 100644
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--- /dev/null
+++ b/tier0/pmc360.cpp
@@ -0,0 +1,88 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Inner workings of Performance Monitor Counters on the xbox 360; 
+// they let vprof track L2 dcache misses, LHS, etc.
+//
+//=============================================================================//
+
+#include "pch_tier0.h"
+
+#ifndef _X360
+#error pmc360.cpp must only be compiled for XBOX360! 
+#else
+
+#include "tier0/platform.h"
+#include "tier0/vprof.h"
+#include <pmcpbsetup.h>
+#include "tier0/dbg.h"
+#include "pmc360.h"
+
+#include "tier0/memdbgon.h"
+
+static bool s_bInitialized = false;
+
+CPMCData::CPMCData() 
+{
+}
+
+void CPMCData::InitializeOnceProgramWide( void )
+{
+#if !defined( _CERT )
+	// Select a set of sixteen counters
+	DmPMCInstallAndStart( PMC_SETUP_FLUSHREASONS_PB0T0 );
+	// Reset the Performance Monitor Counters in preparation for a new sampling run.
+	DmPMCResetCounters();
+#endif
+	s_bInitialized = true;
+}
+
+bool CPMCData::IsInitialized()
+{
+	return s_bInitialized;
+}
+
+void CPMCData::Start()
+{
+#if !defined( _CERT )
+	// stop the stopwatches, save off the counter, start them again.
+	DmPMCStop();
+
+	PMCState pmcstate;
+	// Get the counters.
+	DmPMCGetCounters( &pmcstate );
+
+	// in the default state as set up by InitializeOnceProgramWide, 
+	// counters 9 and 6 are L2 misses and LHS respectively
+	m_OnStart.L2CacheMiss = pmcstate.pmc[9];
+	m_OnStart.LHS = pmcstate.pmc[6];
+
+	DmPMCStart();
+#endif
+}
+
+void CPMCData::End()
+{
+#if !defined( _CERT )
+	DmPMCStop();
+
+	// get end-state counters
+	PMCState pmcstate;
+	// Get the counters.
+	DmPMCGetCounters( &pmcstate );
+
+	// in the default state as set up by InitializeOnceProgramWide, 
+	// counters 9 and 6 are l2 misses and LHS respectively
+	const uint64 &endL2 = pmcstate.pmc[9];
+	const uint64 &endLHS = pmcstate.pmc[6];
+
+	// compute delta between end and start. Because these are 
+	// unsigned nums, even in overflow this still works out
+	// correctly under modular arithmetic.
+	m_Delta.L2CacheMiss = endL2 - m_OnStart.L2CacheMiss;
+	m_Delta.LHS = endLHS - m_OnStart.LHS;
+
+	DmPMCStart();
+#endif
+}
+
+#endif