/*

* Copyright (c) 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:

*

*/

/**

 * @file

 * @internalTechnology

 *

 * The highrestimer.h header file defines how to access the high resoltion

 * timer, if one is supported.  This file is used by default if the variant does

 * not export one to \epoc32\include\nkern. 

 */

#ifndef __HIGHRESTIMER_H__

#define __HIGHRESTIMER_H__

//

// Copyright (c) 2008 Symbian Ltd. All rights reserved.

//

#include <syborg.h>

/**

 * Macro indicating that a high resolution timer is supported.

 */

#define HAS_HIGH_RES_TIMER

/**

 * Assembler macro to get the the current value of the high res timer and place

 * it in the specified register.

 * Reads the 32-bit value from a free-running counter that represents the current time. 

 * Syborg timers have 'microsecond resolution'. NB. This value comes from the host clock

 * and so there is a good chance that the kernels tick based notion of time (elapsed) and that

 * measured by the free running timer will get out of kilter. This affects t_cputime from e32test

 * amongst other things.

 */

//#define GET_HIGH_RES_TICK_COUNT(Rd) asm("nop");

// Hi-jacking r10 for tmp, not good if Rd is R10 -- grepping the the kernel shows it's not (for now)

#define GET_HIGH_RES_TICK_COUNT(Rd)						         \

  asm("push {r10}");										     \

  asm("ldr "#Rd", =%a0"               : : "i" (KHwBaseRtc + 4)); \

  asm("str r10, ["#Rd", #%a0]"        : : "i" (0));			     \

  asm("pop {r10}");                                              \

  asm("ldr "#Rd", =%a0"               : : "i" (KHwBaseRtc + 8)); \

  asm("ldr "#Rd", ["#Rd", #%a0]"      : : "i" (0));              

/**

 * The frequency of the timer in Hz.

 */

const TInt KHighResTimerFrequency = 1000000;

/**

 * Macro indicating that the timer counts up if defined.

 */

#define HIGH_RES_TIMER_COUNTS_UP

#endif  // __HIGHRESTIMER_H__