/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:  

* naviengine_assp\assp.cpp

*

*/

#include <naviengine_priv.h>

#ifdef __SMP__

TSpinLock AsspLock(TSpinLock::EOrderGenericIrqLow1);

#endif

//

//

// MHA - Modular Hardware Adaption

//

// Register Access

//

//

//

// We need spin locks around read, modify, write operations because another CPU

// may access the same memory in between operations and potentially cause

// memory corruption.

//

EXPORT_C void AsspRegister::Modify8(TLinAddr aAddr, TUint8 aClearMask, TUint8 aSetMask)

	{

	TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock);

	TUint8  value = *(volatile TUint8  *)aAddr;

	value &= ~aClearMask;

	value |= aSetMask;

	*(volatile TUint8  *)aAddr = value;

	__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq);

	}

EXPORT_C void AsspRegister::Modify16(TLinAddr aAddr, TUint16 aClearMask, TUint16 aSetMask)

	{

	TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock);

	TUint16 value = *(volatile TUint16 *)aAddr;

	value &= ~aClearMask;

	value |= aSetMask;

	*(volatile TUint16 *)aAddr = value;

	__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq);

	}

EXPORT_C void AsspRegister::Modify32(TLinAddr aAddr, TUint32 aClearMask, TUint32 aSetMask)

	{

	TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock);

	TUint32 value = *(volatile TUint32 *)aAddr;

	value &= ~aClearMask;

	value |= aSetMask;

	*(volatile TUint32 *)aAddr = value;

	__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq);

	}

//

// 64 bit operations may be more complex than 8/16/32 bit operations, depending

// upon hardware support for 64 bit accesses.

//

// For example, one platform required an assembly language function to prevent

// the compliler optimising the accesses into 2 x 32 bit accesses and causing a

// bus error.

//

// Spinlocks are required for non-atomic operations and are therefore

// recommended for 64 bit accesses on current platforms.

//

extern TUint64 DoRead64(TLinAddr aAddr);

EXPORT_C TUint64 AsspRegister::Read64(TLinAddr aAddr)

	{

	TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock);

	TUint64 value = DoRead64(aAddr);

	__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq);

	return value;

	}

extern void DoWrite64(TLinAddr aAddr, TUint64 aValue);

EXPORT_C void AsspRegister::Write64(TLinAddr aAddr, TUint64 aValue)

	{

	TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock);

	DoWrite64(aAddr, aValue);

	__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq);

	}

EXPORT_C void AsspRegister::Modify64(TLinAddr aAddr, TUint64 aClearMask, TUint64 aSetMask)

	{

	TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock);

	TUint64 value = DoRead64(aAddr);

	value &= ~aClearMask;

	value |= aSetMask;

	DoWrite64(aAddr, value);

	__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq);

	}