// Copyright (c) 1994-2009 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:

// e32\memmodel\epoc\moving\mkernel.cpp

// 

//

#include "memmodel.h"

/********************************************

 * Thread

 ********************************************/

TInt DThread::AllocateSupervisorStack()

	{

	__KTRACE_OPT(KTHREAD,Kern::Printf("DThread::AllocateSupervisorStack %O %x",this,iSupervisorStackSize));

	iSupervisorStackSize=Mmu::RoundToPageSize(iSupervisorStackSize);

	if (iThreadType!=EThreadInitial)

		{

		TInt offset=MM::SvStackChunk->Allocate(iSupervisorStackSize,PP::SupervisorThreadStackGuard);

		if (offset<0)

			{

			__KTRACE_FAIL(KErrNoMemory,Kern::Printf("ASS: %d",KErrNoMemory));

			return KErrNoMemory;

			}

		iSupervisorStack=MM::SvStackChunk->Base()+offset+PP::SupervisorThreadStackGuard;

		iSupervisorStackAllocated = TRUE;

		__KTRACE_OPT(KTHREAD,Kern::Printf("Supervisor stack at %x, size %x",iSupervisorStack,iSupervisorStackSize));

		}

	return KErrNone;

	}

void DThread::FreeSupervisorStack()

	{

	__KTRACE_OPT(KTHREAD,Kern::Printf("DThread::FreeSupervisorStack %O",this));

	if (iSupervisorStackAllocated)

		{

		TAny* pStack = __e32_atomic_swp_ord_ptr(&iSupervisorStack, 0);

		if (pStack && iThreadType!=EThreadInitial)

			{

			__KTRACE_OPT(KTHREAD,Kern::Printf("Freeing supervisor stack at %08x, size %x",pStack,iSupervisorStackSize));

			TInt offset=(TUint8*)pStack-MM::SvStackChunk->Base();

			MM::SvStackChunk->Decommit(offset-PP::SupervisorThreadStackGuard,iSupervisorStackSize+PP::SupervisorThreadStackGuard);

			}

		}

	iSupervisorStackAllocated = FALSE;

	}

TInt DThread::AllocateUserStack(TInt aSize, TBool /*aPaged*/)

	{

	__KTRACE_OPT(KTHREAD,Kern::Printf("DThread::AllocateUserStack %O %x",this,aSize));

	aSize=Mmu::RoundToPageSize(aSize);

	if (aSize>PP::MaxUserThreadStack)

		return KErrTooBig;

	TInt guard=PP::UserThreadStackGuard;

	DProcess* pP=iOwningProcess;

	NKern::LockSystem();

	DChunk* pC=pP->iDataBssStackChunk;

	if (!pC || pC->Open()!=KErrNone)	// so chunk doesn't disappear during Allocate()

		{

		NKern::UnlockSystem();

		__KTRACE_FAIL(KErrDied,Kern::Printf("AUS1: %d",KErrDied));

		return KErrDied;

		}

	NKern::UnlockSystem();

	TInt r=pC->Allocate(aSize,guard);

	TInt s=pC->Close(NULL);				// NULL since we didn't add chunk to process again

	if (s & EObjectDeleted)

		{

		__KTRACE_FAIL(KErrDied,Kern::Printf("AUS2: %d",KErrDied));

		return KErrDied;

		}

	if (r<0)

		{

		__KTRACE_FAIL(r,Kern::Printf("AUS3: %d",r));

		return r;

		}

	iUserStackSize=aSize;

	iUserStackRunAddress=pP->iDataBssRunAddress+r+guard;

	__KTRACE_OPT(KTHREAD,Kern::Printf("User stack run address at %x",iUserStackRunAddress));

	return KErrNone;

	}

void DThread::FreeUserStack()

	{

	__KTRACE_OPT(KTHREAD,Kern::Printf("DThread::FreeUserStack %O",this));

	TLinAddr usr_stack = (TLinAddr)__e32_atomic_swp_ord_ptr(&iUserStackRunAddress, 0);

	if (usr_stack)

		{

		__KTRACE_OPT(KTHREAD,Kern::Printf("Freeing user stack at %x",usr_stack));

		DMemModelProcess* pP=(DMemModelProcess*)iOwningProcess;

		NKern::LockSystem();

		DMemModelChunk* pC=(DMemModelChunk*)pP->iDataBssStackChunk;

		if (!pC || pC->Open()!=KErrNone)	// so chunk doesn't disappear during Decommit()

			{

			NKern::UnlockSystem();

			__KTRACE_FAIL(KErrDied,Kern::Printf("FUS"));

			return;

			}

		NKern::UnlockSystem();

		TInt offset=usr_stack-pP->iDataBssRunAddress;

		pC->Decommit(offset-PP::UserThreadStackGuard,iUserStackSize+PP::UserThreadStackGuard);

		pC->Close(NULL);			// NULL since we didn't add chunk to process again

		}

	}

void DThread::IpcExcHandler(TExcTrap* aTrap, DThread* aThread, TAny* aContext)

	{

	aThread->iIpcClient = 0;

	TIpcExcTrap& xt=*(TIpcExcTrap*)aTrap;

	switch (xt.ExcLocation(aThread, aContext))

		{

		case TIpcExcTrap::EExcRemote:

			// problem accessing remote address - 'leave' so an error code will be returned

			xt.Exception(KErrBadDescriptor);  // does not return

		case TIpcExcTrap::EExcLocal:

			// problem accessing local address - return and panic current thread as usual

			NKern::UnlockSystem();

			return;

		default:

			// otherwise return and fault kernel

			return;

		}

	}