kerneltest/e32test/misc/d_ipccpy.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:24:54 +0200
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// Copyright (c) 1997-2009 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 the License "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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// e32test\misc\d_ipccpy.cpp
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// LDD for testing IPC copy functions
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// 
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//
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#include "platform.h"
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#include <kernel/kern_priv.h>
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#include "d_ipccpy.h"
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const TInt KMajorVersionNumber=0;
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const TInt KMinorVersionNumber=1;
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const TInt KBuildVersionNumber=1;
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const TInt KBigBufferSize = 65536;
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_LIT(KDIpcCpyPanicCategory,"DIpcCpy");
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class DIpcCpyFactory : public DLogicalDevice
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//
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// IPC copy LDD factory
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//
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	{
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public:
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	DIpcCpyFactory();
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	~DIpcCpyFactory();
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	virtual TInt Install();						//overriding pure virtual
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	virtual void GetCaps(TDes8& aDes) const;	//overriding pure virtual
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	virtual TInt Create(DLogicalChannelBase*& aChannel);	//overriding pure virtual
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private:
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	TDynamicDfcQue* iDfcQ;
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	};
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class DIpcCpy : public DLogicalChannel
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//
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// Millisecond timer LDD channel
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//
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	{
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public:
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	DIpcCpy(TDfcQue* aDfcQ);
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	virtual ~DIpcCpy();
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protected:
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	virtual TInt DoCreate(TInt aUnit, const TDesC8* anInfo, const TVersion& aVer);
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	virtual TInt Request(TInt aFunc, TAny* a1, TAny* a2);
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	virtual void HandleMsg(TMessageBase* aMsg);
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public:
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	void TimerExpired();
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	TInt CreateHardwareChunks(TPtr8& aUserDes);
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	// Panic reasons
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	enum TPanic
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		{
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		ERequestAlreadyPending = 1
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		};
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public:
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	DThread* iThread;
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	TClientRequest* iAsyncRequest;
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	TAny* iDest;
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	TInt iSeqNum;
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	NTimer iTimer;
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	TDfc iDfc;
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	TUint8 iBuffer[260];
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	TUint8* iBigBuffer;
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#ifdef __EPOC32__
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	DPlatChunkHw* iHwChunks[RIpcCpy::ENumHwChunkTypes];
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#endif
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	TLinAddr iHwChunkLinAddrs[RIpcCpy::ENumHwChunkTypes];
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	};
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DECLARE_STANDARD_LDD()
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	{
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    return new DIpcCpyFactory;
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    }
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DIpcCpyFactory::DIpcCpyFactory()
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//
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// Constructor
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//
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    {
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    iVersion=TVersion(KMajorVersionNumber,KMinorVersionNumber,KBuildVersionNumber);
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    //iParseMask=0;//No units, no info, no PDD
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    //iUnitsMask=0;//Only one thing
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    }
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DIpcCpyFactory::~DIpcCpyFactory()
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//
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// Destructor
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//
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	{
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	if (iDfcQ)
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		iDfcQ->Destroy();
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	}
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TInt DIpcCpyFactory::Create(DLogicalChannelBase*& aChannel)
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//
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// Create a new DIpcCpy on this logical device
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//
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    {
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	aChannel=new DIpcCpy(iDfcQ);
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    return aChannel?KErrNone:KErrNoMemory;
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    }
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const TInt KIpcCpyThreadPriority = 27;
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_LIT(KIpcCpyThread,"IpcCpyThread");
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TInt DIpcCpyFactory::Install()
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//
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// Install the LDD - overriding pure virtual
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//
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    {
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	// Allocate a kernel thread to run the DFC 
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	TInt r = Kern::DynamicDfcQCreate(iDfcQ, KIpcCpyThreadPriority, KIpcCpyThread);
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#ifdef CPU_AFFINITY_ANY
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	NKern::ThreadSetCpuAffinity((NThread*)(iDfcQ->iThread), KCpuAffinityAny);			
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#endif
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	if (r != KErrNone)
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		return r; 	
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    return SetName(&KIpcCpyLddName);
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    }
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void DIpcCpyFactory::GetCaps(TDes8& aDes) const
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//
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// Get capabilities - overriding pure virtual
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//
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    {
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    TCapsIpcCpyV01 b;
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    b.iVersion=TVersion(KMajorVersionNumber,KMinorVersionNumber,KBuildVersionNumber);
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    Kern::InfoCopy(aDes,(TUint8*)&b,sizeof(b));
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    }
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void timerExpired(TAny* aPtr)
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	{
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	DIpcCpy* p=(DIpcCpy*)aPtr;
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	p->iDfc.Add();
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	}
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void dfcFn(TAny* aPtr)
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	{
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	DIpcCpy* p=(DIpcCpy*)aPtr;
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	p->TimerExpired();
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	}
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DIpcCpy::DIpcCpy(TDfcQue* aDfcQ)
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//
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// Constructor
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//
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	:	iTimer(timerExpired,this),
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		iDfc(dfcFn,this,aDfcQ,1)
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    {
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	iThread=&Kern::CurrentThread();
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	iThread->Open();
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//	iSeqNum=0;
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//	iDest=NULL;
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	SetDfcQ(aDfcQ);
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    }
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DIpcCpy::~DIpcCpy()
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	{
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	if (iAsyncRequest)
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		{
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		Kern::QueueRequestComplete(iThread, iAsyncRequest, KErrCancel);	// does nothing if request not pending
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		Kern::DestroyClientRequest(iAsyncRequest);
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		}
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	Kern::Free(iBigBuffer);
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	Kern::SafeClose((DObject*&)iThread, NULL);
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#ifdef __EPOC32__
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	for(TInt i=0; i<RIpcCpy::ENumHwChunkTypes; i++)
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		Kern::SafeClose((DObject*&)iHwChunks[i], NULL);
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#endif
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	}
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TInt DIpcCpy::DoCreate(TInt /*aUnit*/, const TDesC8* /*anInfo*/, const TVersion& aVer)
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//
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// Create channel
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//
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    {
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    if (!Kern::QueryVersionSupported(TVersion(KMajorVersionNumber,KMinorVersionNumber,KBuildVersionNumber),aVer))
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    	return KErrNotSupported;
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	TInt r = Kern::CreateClientRequest(iAsyncRequest);
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	if (r!=KErrNone)
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		return r;
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	iBigBuffer = (TUint8*)Kern::Alloc(KBigBufferSize);
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	if (!iBigBuffer)
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		return KErrNoMemory;
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	iMsgQ.Receive();
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	return KErrNone;
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	}
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TInt DIpcCpy::CreateHardwareChunks(TPtr8& aUserDes)
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	{
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#ifndef __EPOC32__
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	(void)aUserDes;
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	return KErrNone;
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#else
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	NKern::ThreadEnterCS();
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	TInt r;
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	TUint32 size=Kern::RoundToPageSize(1);
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#ifdef __X86__
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	const TUint attrs[] = { EMapAttrSupRw, EMapAttrUserRw, EMapAttrReadUser }; // X86 does support EMapAttrUserRo, so use EMapAttrReadUser
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#else
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	const TUint attrs[] = { EMapAttrSupRw, EMapAttrUserRw, EMapAttrUserRo };
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#endif
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	for(TInt i=0; i<RIpcCpy::ENumHwChunkTypes; i++)
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		{
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		TPhysAddr phys;
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		r = Epoc::AllocPhysicalRam(size,phys);
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		if(r!=KErrNone)
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			{
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   228
			NKern::ThreadLeaveCS();
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   229
			return r;
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   230
			}
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parents:
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   231
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		TChunkCreateInfo info;
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diff changeset
   233
		info.iType = TChunkCreateInfo::ESharedKernelMultiple;
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parents:
diff changeset
   234
		info.iMaxSize = size;
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parents:
diff changeset
   235
		info.iMapAttr = 0;
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parents:
diff changeset
   236
		info.iOwnsMemory = EFalse;
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parents:
diff changeset
   237
		DChunk* chunk;
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diff changeset
   238
		TLinAddr base;
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parents:
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   239
		TUint32 attr;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   240
		r = Kern::ChunkCreate(info,chunk,base,attr);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   241
		if(r==KErrNone)
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parents:
diff changeset
   242
			{
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parents:
diff changeset
   243
			r=Kern::ChunkCommitPhysical(chunk, 0, size, phys);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   244
			if(r==KErrNone)
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parents:
diff changeset
   245
				{
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parents:
diff changeset
   246
				memcpy((TAny*)base,&aUserDes,sizeof(TPtr8));
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parents:
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   247
				}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   248
			Kern::ChunkClose(chunk);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   249
			if(r==KErrNone)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   250
				r = DPlatChunkHw::New(iHwChunks[i], phys, size, attrs[i]);
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parents:
diff changeset
   251
			}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   252
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   253
		if(r==KErrNone)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   254
			{
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parents:
diff changeset
   255
			iHwChunkLinAddrs[i] = iHwChunks[i]->LinearAddress();
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   256
			}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   257
		else if (r==KErrNotSupported) //ARMv6K && ARMv7 do not support EMapAttrUserRo
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   258
			{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   259
			iHwChunkLinAddrs[i] = 0;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   260
			r = KErrNone;			
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   261
			}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   262
		else
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   263
			{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   264
			Epoc::FreePhysicalRam(phys,size);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   265
			NKern::ThreadLeaveCS();
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   266
			return r;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   267
			}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   268
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   269
		}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   270
	NKern::ThreadLeaveCS();
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   271
	return r;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   272
#endif
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   273
	}
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parents:
diff changeset
   274
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   275
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   276
TInt DIpcCpy::Request(TInt aFunc, TAny* a1, TAny* a2)
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parents:
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   277
	{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   278
	if (aFunc == RIpcCpy::EControlBigRead)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   279
		{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   280
		TUint size = (TUint)a2;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   281
		if (size > (TUint)KBigBufferSize)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   282
			return KErrOverflow;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   283
		kumemput(a1, iBigBuffer, size);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   284
		return KErrNone;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   285
		}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   286
	else if (aFunc == RIpcCpy::EControlBigWrite)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   287
		{
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diff changeset
   288
		TUint size = (TUint)a2;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   289
		if (size > (TUint)KBigBufferSize)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   290
			return KErrOverflow;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   291
		kumemget(iBigBuffer, a1, size);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   292
		return KErrNone;
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   293
		}
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   294
	else if (aFunc == RIpcCpy::EControlHardwareChunks)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   295
		{
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   296
		TPtr8 des(0,0,0);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   297
		kumemget(&des,a2,sizeof(TPtr8));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   298
		TInt r=CreateHardwareChunks(des);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   299
		if(r==KErrNone)
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   300
			kumemput(a1, iHwChunkLinAddrs, sizeof(iHwChunkLinAddrs));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   301
		return r;
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   302
		}
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   303
	return DLogicalChannel::Request(aFunc, a1, a2);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   304
	}
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   305
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   306
void DIpcCpy::HandleMsg(TMessageBase* aMsg)
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   307
	{
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   308
	TInt r=KErrNone;
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   309
	TThreadMessage& m=*(TThreadMessage*)aMsg;
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   310
	TInt id=m.iValue;
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   311
	if (id==(TInt)ECloseMsg)
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   312
		{
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   313
		iTimer.Cancel();
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   314
		iDfc.Cancel();
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   315
		m.Complete(KErrNone,EFalse);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   316
		iMsgQ.CompleteAll(KErrServerTerminated);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   317
		return;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   318
		}
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   319
	else if (id<0)
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   320
		{
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   321
		TRequestStatus* pS=(TRequestStatus*)m.Ptr0();
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   322
		if (iAsyncRequest->SetStatus(pS) != KErrNone)
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   323
			Kern::ThreadKill(iThread,EExitPanic,ERequestAlreadyPending,KDIpcCpyPanicCategory);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   324
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   325
		if (id==~RIpcCpy::ERequestIpcCpy)
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   326
			{
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   327
			iDest=m.Ptr1();
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   328
			iTimer.OneShot(1);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   329
			}
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   330
		else
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   331
			{
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   332
			r=KErrNotSupported;
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   333
			}
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   334
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   335
		if(r!=KErrNone)
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   336
			{
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   337
			Kern::QueueRequestComplete(iThread, iAsyncRequest, r);
96e5fb8b040d Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   338
			r = KErrNone;
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			}
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		}
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	else
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		{
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		r=KErrNotSupported;
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		}
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   345
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	m.Complete(r,ETrue);
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	}
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   348
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   349
void DIpcCpy::TimerExpired()
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	{
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	TInt src_offset=iSeqNum&3;
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	TInt dest_offset=(iSeqNum>>2)&3;
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	TInt length=(iSeqNum>>4)+1;
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	TInt i;
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	for (i=src_offset; i<length+src_offset; ++i)
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		iBuffer[i]=(TUint8)(i+1);
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	TPtrC8 ptr(iBuffer+src_offset, length);
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	TInt r=Kern::ThreadDesWrite(iThread, iDest, ptr, dest_offset, KChunkShiftBy0, NULL);
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   359
	if (r==KErrNone)
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   360
		{
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		r=iSeqNum;
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		if (++iSeqNum==4096)
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			iSeqNum=0;
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		}
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	Kern::QueueRequestComplete(iThread, iAsyncRequest, r);
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	}
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   367