// Copyright (c) 1998-2010 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:

// e32\nkern\win32\vectors.cpp

//

//

#include "nk_priv.h"

inline TInt Invoke(TLinAddr aHandler, const TInt* aArgs)

	{

	return (TExecHandler(aHandler))(aArgs[0], aArgs[1], aArgs[2], aArgs[3]);

	}

/**	Executive dispatcher.

	This is hooked by EUSER to handle executive dispatch into the kernel.

	aArgs can be treated as an array of 1 to 4 arguments (depending on the exec call).

	@internalTechnology

 */

EXPORT_C TInt __fastcall Dispatch(TInt aFunction, TInt* aArgs)

	{

	NThread& me = *static_cast<NThread*>(TheScheduler.iCurrentThread);

	__NK_ASSERT_ALWAYS(!me.iDiverting);

	EnterKernel();

	if (aFunction & 0x800000)

		{

		// fast exec

		const SFastExecTable* table = me.iFastExecTable;

		aFunction &= 0x7fffff;

		if (aFunction == 0)

			{

			// special case fast exec call

			NKern::WaitForAnyRequest();

			LeaveKernel();

			return 0;

			}

		if (TUint(aFunction) < TUint(table->iFastExecCount))

			{

			NKern::Lock();

			TInt r = Invoke(table->iFunction[aFunction-1], aArgs);

			NKern::Unlock();

			LeaveKernel();

			return r;

			}

		// invalid exec number passed, so ensure we invoke the invalid exec

		// handler by setting an illegal slow exec number

		aFunction = -1;

		}

	// slow exec

	const SSlowExecTable* table = (const SSlowExecTable*)((const TUint8*)me.iSlowExecTable - _FOFF(SSlowExecTable, iEntries));

	if (TUint(aFunction) >= TUint(table->iSlowExecCount))

		return Invoke(table->iInvalidExecHandler, aArgs);

	const SSlowExecEntry& e = table->iEntries[aFunction];

	if (e.iFlags & KExecFlagClaim)

		NKern::LockSystem();

	if (e.iFlags & KExecFlagPreprocess)

		{

		// replace the first argument with the result of preprocessing

		TPreprocessHandler preprocesser = (TPreprocessHandler)table->iPreprocessHandler;

		preprocesser(aArgs, e.iFlags);

		}

	TInt r = Invoke(e.iFunction, aArgs);

	if (e.iFlags & KExecFlagRelease)

		NKern::UnlockSystem();

	LeaveKernel();

	return r;

	}