/*

* 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:

*

*/

// D_FTRACE.CPP

//

//

//

#include "plat_priv.h"

#include <kernel/kernel.h>

#include "f32trace.h"

DMutex* TheTraceMutex = NULL;

_LIT(KLitTraceMutexName, "FTRACE_MUTEX");

const TInt KMajorVersionNumber=1;

const TInt KMinorVersionNumber=0;

const TInt KBuildVersionNumber=0;

class DLddFactoryFTrace : public DLogicalDevice

	{

public:

	DLddFactoryFTrace();

	virtual ~DLddFactoryFTrace();

	virtual TInt Install();

	virtual void GetCaps(TDes8 &aDes) const;

	virtual TInt Create(DLogicalChannelBase*& aChannel); 	//overriding pure virtual

	};

class DLddFTrace : public DLogicalChannelBase

	{

public:

	DLddFTrace();

	~DLddFTrace();

protected:

	virtual TInt DoCreate(TInt aUnit, const TDesC8* anInfo, const TVersion& aVer);

	virtual TInt Request(TInt aReqNo, TAny* a1, TAny* a2);

private:

	void DoCancel(TInt aReqNo);

	TInt DoRequest(TInt aReqNo, TRequestStatus* aStatus, TAny* a1, TAny* a2);

	TInt DoControl(TInt aFunction, TAny* a1, TAny* a2);

private:

    };

DECLARE_STANDARD_LDD()

	{

	TInt r = Kern::MutexCreate(TheTraceMutex,  KLitTraceMutexName, KMutexOrdNone);

	if (r != KErrNone)

		return NULL;

	return new DLddFactoryFTrace;

	}

DLddFactoryFTrace::DLddFactoryFTrace()

	{

    iParseMask=KDeviceAllowUnit;  // Pass stack number as unit

	iUnitsMask=0xffffffff;

	iVersion=TVersion(KMajorVersionNumber,KMinorVersionNumber,KBuildVersionNumber);

	}

TInt DLddFactoryFTrace::Create(DLogicalChannelBase*& aChannel)

	{

	aChannel=new DLddFTrace;

	return aChannel ? KErrNone : KErrNoMemory;

	}

TInt DLddFactoryFTrace::Install()

	{

    TPtrC name=_L("FTrace");

	return(SetName(&name));

	}

void DLddFactoryFTrace::GetCaps(TDes8& /*aDes*/) const

	{

	}

DLddFactoryFTrace::~DLddFactoryFTrace()

	{

	}

DLddFTrace::DLddFTrace()

	{

    }

DLddFTrace::~DLddFTrace()

	{

    }

TInt DLddFTrace::DoCreate(TInt /*aUnit*/, const TDesC8* /*aInfo*/, const TVersion& aVer)

	{

	if (!Kern::QueryVersionSupported(TVersion(KMajorVersionNumber,KMinorVersionNumber,KBuildVersionNumber),aVer))

		return(KErrNotSupported);

    return(KErrNone);

	}

void DLddFTrace::DoCancel(TInt /*aReqNo*/)

	{

	}

TInt DLddFTrace::Request(TInt aReqNo, TAny* a1, TAny* a2)

	{

	NKern::ThreadEnterCS();

	Kern::MutexWait(*TheTraceMutex);

	TInt r = DoControl(aReqNo, a1, a2);

	Kern::MutexSignal(*TheTraceMutex);

	NKern::ThreadLeaveCS();

	return r;

	}

const TUint KTraceBufferSize = 4096;

TUint8 gTraceBuffer[KTraceBufferSize];

#define MIN(a,b)			((a) < (b) ? (a) : (b))

TInt DLddFTrace::DoControl(TInt aFunction, TAny* a1, TAny* a2)

//

// Mostly requests (but some kernel server async ones)

//

	{

	TInt r=KErrNotSupported;

	switch (aFunction)

		{

        case RFTrace::ETraceMultiple:

            {

			typedef struct {

				TClassification iCategory;

				TUint8 iPadding1[sizeof(TUint) - sizeof(TClassification)];

				TFormatId iFormatId;

				TUint8 iPadding2[sizeof(TUint) - sizeof(TFormatId)];

				TUint32 iUid;

				TInt iDescriptorCount;

				} TraceArgs;

			TraceArgs args={0};

			XTRAP(r, XT_DEFAULT, kumemget32(&args, a1, sizeof(args)));

			if (r != KErrNone)

				return r;

			// current descriptor - MUST be either a TPtr8 or a TBuf8<4>

			TUint32& desLength = desc[0];

			TUint offset = 0;

			*((TUint*) (gTraceBuffer+offset)) = args.iFormatId;

			offset+= sizeof(TUint);

			TDesC8* des = (TDesC8*) ((TUint8*) a2);

			const TInt desSize = sizeof(TPtrC8);

			for (TInt n=0; n< args.iDescriptorCount; n++, des = (TDesC8*) (((TUint8*) des) + desSize) )

				{

				XTRAP(r, XT_DEFAULT, kumemget32(desc, des, sizeof(desc)));

				TUint32 desType = desLength >> KShiftDesType;

				desLength &= (TUint) (KMaskDesLength);

				if (desType == EPtrC)

					{

					*((TUint*) (gTraceBuffer+offset)) = desLength;

					desLength = (desLength+3)&~3;

					offset+= sizeof(TUint);

					}

				else if (desType == EBufC)

					{

					*((TUint*) (gTraceBuffer+offset)) = desc[1];

					offset+= sizeof(TUint);

					if (desLength > 4)

						return KErrArgument;

					desLength = 0;

					continue;

					}

				else

					return KErrArgument;

				TUint len = MIN(KTraceBufferSize - offset, desLength);

				XTRAP(r, XT_DEFAULT, kumemget(gTraceBuffer+offset, (const TUint8*) desc[1], len));

				offset+= len;

				}

				(BTRACE_HEADER_C(8,args.iCategory, 0), args.iUid, gTraceBuffer, offset);

			r=KErrNone;

			break;

            }

		}

	return(r);

	}