author | William Roberts <williamr@symbian.org> |
Fri, 01 Oct 2010 11:40:18 +0100 | |
changeset 2 | 048b58430d46 |
parent 0 | 5de814552237 |
permissions | -rw-r--r-- |
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5de814552237
Initial contribution supporting NaviEngine 1
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/* |
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* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* naviengine_assp\assp.cpp |
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* |
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*/ |
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|
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#include <naviengine_priv.h> |
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|
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#ifdef __SMP__ |
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TSpinLock AsspLock(TSpinLock::EOrderGenericIrqLow1); |
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#endif |
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|
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// |
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// |
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// MHA - Modular Hardware Adaption |
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// |
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// Register Access |
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// |
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// |
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|
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|
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// |
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// We need spin locks around read, modify, write operations because another CPU |
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// may access the same memory in between operations and potentially cause |
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// memory corruption. |
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// |
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EXPORT_C void AsspRegister::Modify8(TLinAddr aAddr, TUint8 aClearMask, TUint8 aSetMask) |
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{ |
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TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock); |
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TUint8 value = *(volatile TUint8 *)aAddr; |
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value &= ~aClearMask; |
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value |= aSetMask; |
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*(volatile TUint8 *)aAddr = value; |
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__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq); |
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} |
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|
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EXPORT_C void AsspRegister::Modify16(TLinAddr aAddr, TUint16 aClearMask, TUint16 aSetMask) |
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{ |
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TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock); |
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TUint16 value = *(volatile TUint16 *)aAddr; |
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value &= ~aClearMask; |
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value |= aSetMask; |
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*(volatile TUint16 *)aAddr = value; |
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__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq); |
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} |
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EXPORT_C void AsspRegister::Modify32(TLinAddr aAddr, TUint32 aClearMask, TUint32 aSetMask) |
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{ |
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TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock); |
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TUint32 value = *(volatile TUint32 *)aAddr; |
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value &= ~aClearMask; |
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value |= aSetMask; |
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*(volatile TUint32 *)aAddr = value; |
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__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq); |
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} |
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|
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// |
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// 64 bit operations may be more complex than 8/16/32 bit operations, depending |
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// upon hardware support for 64 bit accesses. |
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// |
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// For example, one platform required an assembly language function to prevent |
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// the compliler optimising the accesses into 2 x 32 bit accesses and causing a |
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// bus error. |
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// |
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// Spinlocks are required for non-atomic operations and are therefore |
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// recommended for 64 bit accesses on current platforms. |
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// |
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extern TUint64 DoRead64(TLinAddr aAddr); |
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EXPORT_C TUint64 AsspRegister::Read64(TLinAddr aAddr) |
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{ |
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TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock); |
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TUint64 value = DoRead64(aAddr); |
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__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq); |
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return value; |
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} |
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extern void DoWrite64(TLinAddr aAddr, TUint64 aValue); |
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EXPORT_C void AsspRegister::Write64(TLinAddr aAddr, TUint64 aValue) |
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{ |
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TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock); |
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DoWrite64(aAddr, aValue); |
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__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq); |
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} |
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EXPORT_C void AsspRegister::Modify64(TLinAddr aAddr, TUint64 aClearMask, TUint64 aSetMask) |
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{ |
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TUint irq = __SPIN_LOCK_IRQSAVE(AsspLock); |
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TUint64 value = DoRead64(aAddr); |
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value &= ~aClearMask; |
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value |= aSetMask; |
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DoWrite64(aAddr, value); |
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__SPIN_UNLOCK_IRQRESTORE(AsspLock,irq); |
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} |
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