// Copyright (c) 1999-2009 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:

//

#if !defined(__BM_BM_LDD_H__)

#define __BM_BM_LDD_H__

#include <e32def.h>

#include <e32cmn.h>

/**

 * The filename of the benchmark-suite logical device driver DLL

 */

_LIT(KBMLddFileName, "bm_ldd");

/**

 * The name of the benchmark-suite logical device.

 */

_LIT(KBMLdName, "bm_dev");

/**

 * The filename of the benchmark-suite physical device driver DLL

 */

_LIT(KBMPddFileName, "bm_pdd");

/**

 * The name of the benchmark-suite physical device.

 */

_LIT(KBMPdName, "bm_dev.pdd");

typedef Uint64 TBMUInt64;

typedef Int64 TBMInt64;

/**

 * Integer type for high-resolution RBMTimer ticks.

 */

typedef TBMUInt64 TBMTicks;

/**

 * Integer type for nano-second

 */

typedef TBMUInt64 TBMNs;

/**

 * Translates seconds to nano-seconds

 */

 inline TBMNs BMSecondsToNs(TInt aSeconds)

	{

	return TBMNs(aSeconds) * 1000 * 1000 * 1000;

	}

/**

 * Translates milliseconds to nanoseconds

 */

 inline TBMNs BMMsToNs(TInt aMs)

	{

	return TBMNs(aMs) * 1000 * 1000;

	}

/**

 * Translates microseconds to nanoseconds

 */

 inline TBMNs BMUsToNs(TBMUInt64 aUs)

	{

	return TBMNs(aUs) * 1000;

	}

/**

 * Translates nanoseconds to seconds

 */

inline TInt BMNsToSeconds(TBMNs aNs)

	{

	return TInt(aNs/(1000 * 1000 * 1000));

	}

/**

 * Translates nanoseconds to milliseconds

 */

inline TInt BMNsToMs(TBMNs aNs)

	{

	return TInt(aNs/(1000 * 1000));

	}

/**

 * Translates nanoseconds to microseconds

 */

inline TBMUInt64 BMNsToUs(TBMNs aNs)

	{

	return aNs/(1000);

	}

/**

 * RBMChannel class defines the user-side API to the kernel-side half of the benchmark-suite.

 *

 * The kernel-side half is implmented as <code>KBMLdName</code> logical and <code>KBMPdName</code> physical 

 * devices by <code>KBMLddFileName</code> logical and <code>KBMPddFileName</code> physical device driver DLLs

 * respectively.

 *

 * The API enables to measure some kernel-side performace parameters such as interrupt and preemption latences. 

 */

class RBMChannel : public RBusLogicalChannel

	{

public:

	/**

	 * Measured performace parameters.

	 */

	enum TMode

		{

		/**

		 * Interrupt Latency is the elapsed time from the occurrence of an external event to the execution of 

		 * the first instruction of the corresponding interrupt service routine (ISR).

		 */

		EInterruptLatency,

		/**

		 * Kernel Preemption Latency is the elapsed time from the end of the ISR to the execution of the first

		 * instruction of a kernel thread activated by the ISR.

		 */

		EKernelPreemptionLatency,

		/**

		 * User Preemption Latency is the elapsed time from the end of the ISR to the execution of the first 

		 * instruction of a user thread activated by the ISR

		 */

		EUserPreemptionLatency,

		/**

		 * NTimer callback invocations' jitter. 

		 */

		ENTimerJitter,

		/**

		 * The kernel-side overhead of one high-precision timer read.

		 */

		ETimerStampOverhead

		};

	/**

	 * The benchmark-suite logical device controls.

	 * 

	 * There is three groups of controls: (1) measurement of a performance parameter which is accessible through

	 * RBMChannel, (2) high-resolution timer interface which is accessible through RBMTimer and (3) misc controls

	 * accessible through RBMDriver.

	 */

	enum TControl

		{

		/**

		 * Prepare to perform a sequence of measurements of a specific performance parameter.

		 */

		EStart,

		/**

		 * Perform one measurement.

		 */

		ERequestInterrupt,

		/**

		 * Get the result of the last measurement.

		 */

		EResult,

		/**

		 * Get the current high-resolution time.

		 */

		ETimerStamp,

		/**

		 * Get the high-resolution timer period.

		 */		

		ETimerPeriod,

		/**

		 * Translate a time value from high-resolution timer ticks to nanoseconds.

		 */	

		ETimerTicksToNs,

		/**

		 * Translate a time value from nanoseconds to high-resolution timer ticks.

		 */

		ETimerNsToTicks,

		/**

		 * Change the absolute priority of a thread.

		 */

		ESetAbsPriority

		};

#ifndef __KERNEL_MODE__

	/**

	 * Open the channel for measurements of one specific performance parameter.

	 * 

	 * @param aMode specifies the performance parameter.

	 *

	 * @return <code>KErrNone</code> on success; otherwise an error code.

	 */

	TInt Open(TMode aMode)

		{

		TInt r = DoCreate(KBMLdName, TVersion(1,0,1), KNullUnit, &KBMPdName, NULL);

		if (r == KErrNone)

			{

			r = DoControl(EStart, (TAny*) aMode);

			if (r != KErrNone)

				{

				Close();

				}

			}

		return r;

		}

	/**

	 * Perform one measurement.

	 */

	void RequestInterrupt()

		{ 

		DoControl(ERequestInterrupt); 

		}

	/**

	 * Get the result of the last measurement.

	 * 

	 * @retval aTicks the result of the last measurement in RBMTimer's ticks

	 */

	void Result(TBMTicks* aTicks)

		{

		User::WaitForAnyRequest();

		DoControl(EResult, aTicks); 

		}

#endif	

	};

/**

 * RBMDriver class defines the user-side API to kernel-side utility operations.

 *

 * The operations are implmented as <code>KBMLdName</code> logical device by <code>KBMLddFileName</code>

 * logical device driver DLL.

 *

 * The API enables to change the absolute prioirty of a thread. 

 */

class RBMDriver : public RBusLogicalChannel

	{

public:

#ifndef __KERNEL_MODE__

	/**

	 * Opens the channel

	 *

	 * @return <code>KErrNone</code> on success; otherwise an error code

	 */

	TInt Open()

		{

		return DoCreate(KBMLdName, TVersion(1,0,1), KNullUnit, &KBMPdName, NULL);

		}

	/**

	 * Change the absolute prioirty of a thread.

	 *

	 * @param aThread a handle to the target thread

	 * @param aNewPrio a new absolute priority for the target thread

	 *

	 * @retval aOldPrio the old absolute priority of the target thread

	 *

	 * @return <code>KErrNone</code> on success; otherwise an error code

	 */	

	TInt SetAbsPriority(RThread aThread, TInt aNewPrio, TInt* aOldPrio)

		{

		TInt aPrio = aNewPrio;

		TInt r = DoControl(RBMChannel::ESetAbsPriority, (TAny*) aThread.Handle(), (TAny*) &aPrio);

		if (r == KErrNone)

			{

			*aOldPrio = aPrio;

			}

		return r;

		}

#endif

	};

/**

 * RBMTimer class defines the user-side API to the high-precision timer.

 *

 * The timer is implmented as <code>KBMLdName</code> logical and <code>KBMPdName</code> physical 

 * devices by <code>KBMLddFileName</code> logical and <code>KBMPddFileName</code> physical device driver DLLs

 * respectively.

 */

class RBMTimer : public RBusLogicalChannel

	{

public:

#ifndef __KERNEL_MODE__

	/**

	 * Opens the channel to the high-precision timer.

	 *

	 * @return <code>KErrNone</code> on success; otherwise an error code

	 */

	TInt Open()

		{

		return DoCreate(KBMLdName, TVersion(1,0,1), KNullUnit, &KBMPdName, NULL); 

		}

	/**

	 * Gets the current time in ticks.

	 *

	 * @retval aTicks the current time in <code>TBMTicks</code>

	 */

	void Stamp(TBMTicks* aTicks)

		{ 

		DoControl(RBMChannel::ETimerStamp, aTicks); 

		}

	/**

	 * Gets the timer period in ticks.

	 *

	 * @retval aPriod the timer period in <code>TBMTicks</code>

	 */	

	void Period(TBMTicks* aPeriod)

		{ 

		DoControl(RBMChannel::ETimerPeriod, aPeriod); 

		}

	/**

	 * Translates ticks to nano-seconds.

	 *

	 * @param aTciks a pointer to the <code>TBMTicks</code> value to be translated.

	 *

	 * @retval aNs the resulting time value in nanoseconds.

	 */	

	void TicksToNs(TBMTicks* aTicks, TBMNs* aNs)

		{ 

		DoControl(RBMChannel::ETimerTicksToNs, aTicks, aNs); 

		}

	/**

	 * Translates nanoseconds to ticks.

	 *

	 * @param aNs a pointer to the time value in nanoseconds to be translated.

	 *

	 * @retval aTicks the resulting time in <code>TBMTicks</code>.

	 */		

	void NsToTicks(TBMNs* aNs, TBMTicks* aTicks)

		{ 

		DoControl(RBMChannel::ETimerTicksToNs, aNs, aTicks); 

		}

#endif

	};

#endif