// 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;

 		}

 	}