// 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\direct\mkernel.cpp

// 

//

#include <memmodel.h>

EXPORT_C TInt Kern::FreeRamInBytes()

	{

	return MM::RamAllocator->Avail()<<MM::RamBlockShift;

	}

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

 * Thread

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

TInt DThread::AllocateSupervisorStack()

	{

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

	iSupervisorStackSize=MM::RoundToBlockSize(iSupervisorStackSize);

	if (iThreadType!=EThreadInitial)

		{

		TAny* p=Kern::Alloc(iSupervisorStackSize);	// just allocate on kernel heap

		if (!p)

			return KErrNoMemory;

		iSupervisorStack=p;

		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));

			Kern::Free(pStack);

			}

		}

	iSupervisorStackAllocated = FALSE;

	}

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

	{

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

	aSize=MM::RoundToBlockSize(aSize);

	if (aSize>PP::MaxUserThreadStack)

		return KErrTooBig;

	TInt r;

	MM::WaitRamAlloc();

	r=MM::AllocRegion(iUserStackRunAddress, aSize);

	if (r==KErrNone)

		iUserStackSize=aSize;

	else

		{

		iUserStackSize=0;

		MM::AllocFailed=ETrue;

		}

	MM::SignalRamAlloc();

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

	return r;

	}

void DThread::FreeUserStack()

	{

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

	TLinAddr usr_stack_size = (TLinAddr)__e32_atomic_swp_ord32(&iUserStackSize, 0);

	if (usr_stack_size)

		{

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

		MM::WaitRamAlloc();

		MM::FreeRegion(iUserStackRunAddress, usr_stack_size);

		iUserStackRunAddress=0;

		MM::SignalRamAlloc();

		}

	}