--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/nkern/win32/ncutilf.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,80 @@
+// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// e32\nkern\win32\ncutilf.cpp
+// 
+//
+
+#include "nk_priv.h"
+
+// Win32 fast counter implementation
+
+static TBool FastCounterSupported = FALSE;
+static TInt FastCounterShift;
+static TInt FastCounterAdjustedFreq;
+
+/** Initialise the fast counter.
+
+    Check whether a high performance counter is available and determine its
+    frequency.  Work out a scaling that allows a 32 bit counter value that wraps
+    at most every 16 seconds.
+*/
+void FastCounterInit()
+	{
+	// Test support by getting count - QueryPerformanceFrequency can succeed
+	// even if not supported
+	LARGE_INTEGER count;
+	count.QuadPart = 0;
+	if (!QueryPerformanceCounter(&count) || count.QuadPart == 0)
+		return;  // not supported
+	
+	LARGE_INTEGER freq;
+	freq.QuadPart = 0;
+	if (!QueryPerformanceFrequency(&freq) || freq.QuadPart == 0)
+		return;  // not supported
+
+	TInt mso = __e32_find_ms1_32(freq.LowPart);
+	FastCounterShift = (mso > 27) ? mso - 27 : 0;
+	
+	FastCounterSupported = TRUE;
+	FastCounterAdjustedFreq = freq.LowPart >> FastCounterShift;	
+	}
+    
+/** Get the current value of the high performance counter.
+
+    If a high performance counter is not available, this uses the millisecond
+    tick count instead.
+*/
+EXPORT_C TUint32 NKern::FastCounter()
+	{
+	if (FastCounterSupported)
+		{
+		LARGE_INTEGER count;
+		count.QuadPart = 0;
+		QueryPerformanceCounter(&count);
+		return (TUint32)(count.QuadPart >> FastCounterShift);
+		}
+	else
+		return NTickCount();
+	}
+
+
+/** Get the frequency of counter queried by NKern::FastCounter().
+*/
+EXPORT_C TInt NKern::FastCounterFrequency()
+	{
+	if (FastCounterSupported)
+		return FastCounterAdjustedFreq;
+	else
+		return 1000000 / TickPeriod();
+	}