We need a way to pass flags to rombuilds in Raptor via extension flm interfaces, so that the CPP pass
of the rom input files can be informed what toolchain we are building with and conditionally
include or exclude files depending on whether the toolchain could build them.
// 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();
}