--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/memmodel/epoc/flexible/mshbuf.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,1908 @@
+// 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:
+// e32/memmodel/epoc/flexible/mshbuf.cpp
+// Shareable Data Buffers
+
+#include <memmodel.h>
+#include "mmu/mm.h"
+#include "mmboot.h"
+#include <kernel/smap.h>
+
+_LIT(KLitDMemModelAlignedShPool,"DMMAlignedShPool");	// Must be no more than 16 characters!
+
+struct TWait
+	{
+	void Link(TWait*& aList)
+		{
+		iSem.SetOwner(NULL);
+		iNext = aList;
+		aList = this;
+		};
+	void Wait()
+		{
+		NKern::FSWait(&iSem);
+		}
+	NFastSemaphore iSem;
+	TWait* iNext;
+
+	static void SignalAll(TWait* aList)
+		{
+		while (aList)
+			{
+			TWait* next = aList->iNext;
+			NKern::FSSignal(&aList->iSem);
+			aList = next;
+			}
+		}
+	};
+
+
+class DShBufMapping : public DBase
+	{
+public:
+	SDblQueLink iObjLink;
+	DMemoryMapping* iMapping;
+	TInt iOsAsid;
+	TWait* iTransitions; // Mapping and Unmapping operations
+	TBool iTransitioning;
+	};
+
+
+DMemModelShPool::DMemModelShPool() : DShPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelShPool::DMemModelShPool"));
+	}
+
+DMemModelShPool::~DMemModelShPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelShPool::~DMemModelShPool"));
+	}
+
+void DMemModelShPool::DestroyClientResources(DProcess* aProcess)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelShPool::DestroyClientResources"));
+
+	TInt r = DestroyAllMappingsAndReservedHandles(aProcess);
+	__NK_ASSERT_DEBUG((r == KErrNone) || (r == KErrDied));
+	(void)r;		// Silence warnings
+	}
+
+DMemModelAlignedShBuf::DMemModelAlignedShBuf(DShPool* aPool) : DShBuf(aPool)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::DMemModelAlignedShBuf()"));
+	}
+
+TInt DMemModelAlignedShBuf::Construct()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::Construct()"));
+
+	TInt r = KErrNone;
+
+	r = DShBuf::Construct();
+
+	if (r == KErrNone)
+		r = Create();
+
+	return r;
+	}
+
+TInt DMemModelAlignedShBuf::Close(TAny* aPtr)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::Close(0x%08x)", aPtr));
+
+	if (aPtr)
+		{
+		DProcess* pP = reinterpret_cast<DProcess*>(aPtr);
+		UnMap(pP);
+		iPool->CloseClient(pP);
+		}
+
+	return DShBuf::Close(aPtr);
+	}
+
+TInt DMemModelAlignedShBuf::AddToProcess(DProcess* aProcess, TUint aAttr)
+	{
+	__KTRACE_OPT(KMMU,Kern::Printf("Adding DMemModelShBuf %O to process %O",this,aProcess));
+	TInt r;
+	TLinAddr base;
+	TUint flags;
+
+	r = iPool->OpenClient(aProcess, flags);
+
+	if (r == KErrNone)
+		{
+		if ((flags & EShPoolAutoMapBuf) && ((aAttr & EShPoolNoMapBuf) == 0))
+			{
+			// note we use the client's pool flags and not the buffer attributes
+			r = Map(flags, aProcess, base);
+
+			if (aProcess == K::TheKernelProcess)
+				iRelAddress = static_cast<TLinAddr>(base);
+			}
+		}
+
+	return r;
+	}
+
+TInt DMemModelAlignedShBuf::Create()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::Create()"));
+	TInt r = KErrNone;
+
+	// calculate memory type...
+	TMemoryObjectType memoryType =  EMemoryObjectUnpaged;
+
+	TMemoryAttributes attr = EMemoryAttributeStandard;
+
+	// calculate memory flags...
+	TMemoryCreateFlags flags = static_cast<TMemoryCreateFlags>((EMemoryCreateDefault|EMemoryCreateUseCustomWipeByte|(0xAA<<EMemoryCreateWipeByteShift)));
+
+	// note that any guard pages will be included in iBufGap, however the amount of memory committed
+	// will be iBufSize rounded up to a page
+	r = MM::MemoryNew(iMemoryObject, memoryType, MM::RoundToPageCount(iPool->iBufGap), flags, attr);
+
+	if(r!=KErrNone)
+		return r;
+
+	if (iPool->iPoolFlags & EShPoolContiguous)
+		{
+		TPhysAddr paddr;
+		r = MM::MemoryAllocContiguous(iMemoryObject, 0, MM::RoundToPageCount(iPool->iBufSize), 0, paddr);
+		}
+	else
+		{
+		r = MM::MemoryAlloc(iMemoryObject, 0, MM::RoundToPageCount(iPool->iBufSize));
+		}
+
+	return r;
+	}
+
+DMemModelAlignedShBuf::~DMemModelAlignedShBuf()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::~DMemModelAlignedShBuf()"));
+
+	__NK_ASSERT_DEBUG(iMappings.IsEmpty());
+
+	MM::MemoryDestroy(iMemoryObject);
+	}
+
+TInt DMemModelAlignedShBuf::Map(TUint aMapAttr, DProcess* aProcess, TLinAddr& aBase)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::Map()"));
+	TInt r = KErrNone;
+
+	DShBufMapping* m = NULL;
+	DMemoryMapping* mapping = NULL;
+	DMemModelProcess* pP = reinterpret_cast<DMemModelProcess*>(aProcess);
+
+	TBool write = (TBool)EFalse;
+
+	// User = ETrue, ReadOnlyWrite = ETrue, Execute = EFalse
+	if (aMapAttr & EShPoolWriteable)
+		write = (TBool)ETrue;
+
+	TMappingPermissions perm = MM::MappingPermissions(pP!=K::TheKernelProcess, write, (TBool)EFalse);
+	TWait wait;
+
+	for(;;)
+		{
+		iPool->LockPool();
+		r = FindMapping(m, pP);
+
+		if (r != KErrNone)
+			break;
+		
+		if (m->iTransitioning)
+			{
+			wait.Link(m->iTransitions);
+			iPool->UnlockPool();
+			wait.Wait();
+			}
+		else
+			{
+			iPool->UnlockPool();
+			return KErrAlreadyExists;
+			}
+		}
+
+	DMemModelAlignedShPoolClient* client = reinterpret_cast<DMemModelAlignedShPoolClient*>(iPool->iClientMap->Find(reinterpret_cast<TUint>(aProcess)));
+
+	__NK_ASSERT_DEBUG(client);
+
+	DMemModelAlignedShPool* pool = reinterpret_cast<DMemModelAlignedShPool*>(iPool);
+
+	__NK_ASSERT_DEBUG(m == NULL);
+	r = pool->GetFreeMapping(m, client);
+
+	if (r == KErrNone)
+		{
+		iMappings.AddHead(&m->iObjLink);
+		m->iTransitioning = ETrue;
+
+		mapping = m->iMapping;
+		iPool->UnlockPool(); // have to release fast lock for MappingMap
+
+		r = MM::MappingMap(mapping, perm, iMemoryObject, 0, MM::RoundToPageCount(pool->iBufSize));
+
+		iPool->LockPool();
+
+		TWait* list = m->iTransitions;
+		m->iTransitions = NULL;
+
+		if (r != KErrNone)
+		    pool->ReleaseMapping(m, client);
+		else
+		    aBase = MM::MappingBase(mapping);
+
+		m->iTransitioning = EFalse;
+		iPool->UnlockPool();
+
+		TWait::SignalAll(list);
+		}
+	else
+		iPool->UnlockPool();
+
+	return r;
+	}
+
+TInt DMemModelAlignedShBuf::FindMapping(DShBufMapping*& aMapping, DMemModelProcess* aProcess)
+	{
+	// Must be in critical section so we don't leak os asid references.
+	__ASSERT_CRITICAL;
+	__NK_ASSERT_DEBUG(iPool->iLock.HeldByCurrentThread());
+
+	TInt r = KErrNotFound;
+	aMapping = NULL;
+
+	// Open a reference on aProcess's os asid so that it can't be freed and 
+	// reused while searching.
+	TInt osAsid = aProcess->TryOpenOsAsid();
+	if (osAsid < 0)
+		{// aProcess has died and freed its os asid.
+		return KErrDied;
+		}
+
+	SDblQueLink* pLink = iMappings.First();
+	SDblQueLink* end = reinterpret_cast<SDblQueLink*>(&iMappings);
+	DShBufMapping* m = NULL;
+
+	while (pLink != end)
+		{
+		m = _LOFF(pLink, DShBufMapping, iObjLink);
+
+		if (m->iOsAsid == osAsid)
+			{
+			aMapping = m;
+			r = KErrNone;
+			break;
+			}
+		pLink = pLink->iNext;
+		}
+
+	// Close the reference on the os asid as if we have a mapping then its lifetime will 
+	// determine whether the process still owns an os asid.
+	aProcess->CloseOsAsid();	
+	return r;
+	}
+
+TInt DMemModelAlignedShBuf::UnMap(DProcess* aProcess)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::UnMap()"));
+
+	TInt r = KErrNone;
+
+	DMemModelProcess* pP = reinterpret_cast<DMemModelProcess*>(aProcess);
+
+	DShBufMapping* m = NULL;
+	TWait wait;
+
+	for(;;)
+		{
+		iPool->LockPool();
+		r = FindMapping(m, pP);
+
+		if (r != KErrNone)
+			{
+			iPool->UnlockPool();
+			return KErrNotFound;
+			}
+
+		if (m->iTransitioning)
+			{
+			wait.Link(m->iTransitions);
+			iPool->UnlockPool();
+			wait.Wait();
+			}
+		else
+			{
+			break;
+			}
+		}
+
+	m->iTransitioning = ETrue;
+	iPool->UnlockPool();
+
+	MM::MappingUnmap(m->iMapping);
+
+	iPool->LockPool();
+	DMemModelAlignedShPoolClient* client = reinterpret_cast<DMemModelAlignedShPoolClient*>(iPool->iClientMap->Find(reinterpret_cast<TUint>(aProcess)));
+
+	__NK_ASSERT_DEBUG(client);
+
+	TWait* list = m->iTransitions;
+	m->iTransitions = NULL;
+	m->iObjLink.Deque();
+	m->iTransitioning = EFalse;
+
+	DMemModelAlignedShPool* pool = reinterpret_cast<DMemModelAlignedShPool*>(iPool);
+	pool->ReleaseMapping(m, client);
+
+	if (aProcess == K::TheKernelProcess)
+	    iRelAddress = NULL;
+
+	iPool->UnlockPool();
+
+	wait.SignalAll(list);
+	return KErrNone;
+	}
+
+TUint8* DMemModelAlignedShBuf::Base(DProcess* aProcess)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShBuf::Base()"));
+	DMemModelProcess* pP = reinterpret_cast<DMemModelProcess*>(aProcess);
+
+	DShBufMapping* mapping = NULL;
+	iPool->LockPool();
+	TInt r = FindMapping(mapping, pP);
+	TUint8* base = NULL;
+
+	if (r == KErrNone)
+		base = reinterpret_cast<TUint8*>(MM::MappingBase(mapping->iMapping));
+	iPool->UnlockPool();
+
+	return base;
+	}
+
+TUint8* DMemModelAlignedShBuf::Base()
+	{
+	return reinterpret_cast<TUint8*>(iRelAddress);
+	}
+
+TInt DMemModelAlignedShBuf::Pin(TPhysicalPinObject* aPinObject, TBool aReadOnly, TPhysAddr& aAddress, TPhysAddr* aPages, TUint32& aMapAttr, TUint& aColour)
+	{
+	CHECK_PRECONDITIONS(MASK_THREAD_CRITICAL,"DMemModelAlignedShBuf::Pin");
+
+	TInt r = MM::PinPhysicalMemory(iMemoryObject, (DPhysicalPinMapping*)aPinObject, 0,
+								   MM::RoundToPageCount(Size()),
+								   aReadOnly, aAddress, aPages, aMapAttr, aColour);
+
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::GetFreeMapping(DShBufMapping*& aMapping, DMemModelAlignedShPoolClient* aClient)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::GetFreeMapping()"));
+	__NK_ASSERT_DEBUG(iLock.HeldByCurrentThread());
+
+	TInt r = KErrNotFound;
+	aMapping = NULL;
+
+	if (aClient)
+		{
+		if (!aClient->iMappingFreeList.IsEmpty())
+			{
+			aMapping = _LOFF(aClient->iMappingFreeList.GetFirst(), DShBufMapping, iObjLink);
+			r = KErrNone;
+			}
+		else
+			{
+			r = KErrNoMemory;
+			}
+		}
+
+	__KTRACE_OPT(KMMU2, Kern::Printf("DMemModelAlignedShPool::GetFreeMapping(0x%08x, 0x%08x) returns %d", aMapping, aClient, r));
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::ReleaseMapping(DShBufMapping*& aMapping, DMemModelAlignedShPoolClient* aClient)
+	{
+	__KTRACE_OPT(KMMU2, Kern::Printf("DMemModelAlignedShPool::ReleaseMapping(0x%08x,0x%08x)",aMapping,aClient));
+	__NK_ASSERT_DEBUG(iLock.HeldByCurrentThread());
+
+	TInt r = KErrNone;
+
+	if (aClient)
+		{
+		aClient->iMappingFreeList.AddHead(&aMapping->iObjLink);
+		aMapping = NULL;
+		}
+	else
+		{
+		// pool has probably been closed delete mapping
+		r = KErrNotFound;
+		__KTRACE_OPT(KMMU2, Kern::Printf("DMemModelAlignedShPool::ReleaseMapping delete 0x%08x",aMapping));
+		UnlockPool(); // have to release fast lock for MappingDestroy
+		MM::MappingDestroy(aMapping->iMapping);
+		delete aMapping;
+		aMapping = NULL;
+		LockPool();
+		}
+
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::SetBufferWindow(DProcess* aProcess, TInt aWindowSize)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::SetBufferWindow()"));
+
+	// Create and construct mappings but do not map
+	// also allocate reserved handles
+	TInt r = KErrNone;
+	TUint noOfBuffers = aWindowSize;
+
+	if (aWindowSize > static_cast<TInt>(iMaxBuffers))
+		return KErrArgument;
+
+	Kern::MutexWait(*iProcessLock);
+
+	LockPool();
+	DMemModelAlignedShPoolClient* client = reinterpret_cast<DMemModelAlignedShPoolClient*>(iClientMap->Find(reinterpret_cast<TUint>(aProcess)));
+	UnlockPool();
+
+	if (client)
+		{
+		if (client->iWindowSize != 0)
+			{
+			Kern::MutexSignal(*iProcessLock);
+			return KErrAlreadyExists;
+			}
+
+		if (aWindowSize < 0)
+			{
+			noOfBuffers = iTotalBuffers;
+			}
+
+		DMemModelProcess* pP = reinterpret_cast<DMemModelProcess*>(aProcess);
+		r = CreateMappings(client, noOfBuffers, pP);
+
+		if (r == KErrNone)
+			{
+			client->iWindowSize = aWindowSize;
+			}
+		else
+			{
+			DestroyMappings(client, noOfBuffers);
+			}
+		}
+	else
+		{
+		r = KErrNotFound;
+		}
+
+	Kern::MutexSignal(*iProcessLock);
+
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::MappingNew(DShBufMapping*& aMapping, DMemModelProcess* aProcess)
+	{
+	// Must be in critical section so we don't leak os asid references.
+	__ASSERT_CRITICAL;
+
+	TMappingCreateFlags flags=EMappingCreateDefault;
+
+	FlagSet(flags, EMappingCreateReserveAllResources);
+
+	// Open a reference to aProcess's os so it isn't freed and reused while
+	// we're creating this mapping.
+	TInt osAsid = aProcess->TryOpenOsAsid();
+	if (osAsid < 0)
+		{// The process has freed its os asid so can't create a new mapping.
+		return KErrDied;
+		}
+
+	DMemoryMapping* mapping = NULL;
+	DShBufMapping* m = NULL;
+	TInt r = MM::MappingNew(mapping, MM::RoundToPageCount(iBufGap), osAsid, flags);
+
+	if (r == KErrNone)
+		{
+		m = new DShBufMapping;
+
+		if (m)
+			{
+			m->iMapping = mapping;
+			m->iOsAsid = osAsid;
+			}
+		else
+			{
+			MM::MappingDestroy(mapping);
+			r = KErrNoMemory;
+			}
+		}
+
+	// Close the reference on the os asid as while aMapping is valid then the 
+	// os asid must be also.
+	aProcess->CloseOsAsid();
+
+	aMapping = m;
+	__KTRACE_OPT(KMMU2, Kern::Printf("DMemModelAlignedShPool::MappingNew returns 0x%08x,%d",aMapping,r));
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::AddToProcess(DProcess* aProcess, TUint aAttr)
+	{
+	__KTRACE_OPT(KMMU,Kern::Printf("Adding DMemModelAlignedShPool %O to process %O",this,aProcess));
+	TInt r = KErrNone;
+
+	Kern::MutexWait(*iProcessLock);
+
+	LockPool();
+	DShPoolClient* client = reinterpret_cast<DShPoolClient*>(iClientMap->Find(reinterpret_cast<TUint>(aProcess)));
+	UnlockPool();
+
+	if (!client)
+		{
+		client = new DMemModelAlignedShPoolClient;
+		if (client)
+			{
+			client->iFlags = aAttr;
+			r = iClientMap->Add(reinterpret_cast<TUint>(aProcess), client);
+
+			if (r == KErrNone)
+				{
+				if (aProcess != K::TheKernelProcess)
+					{
+					r = aProcess->iHandles.Reserve(iTotalBuffers);
+
+					if (r != KErrNone)
+						{
+						iClientMap->Remove(reinterpret_cast<TUint>(aProcess));
+						}
+					}
+				}
+			if (r != KErrNone)
+				{
+				delete client;
+				r = KErrNoMemory;
+				}
+			}
+		else
+			{
+			r = KErrNoMemory;
+			}
+		}
+	else
+		{
+		LockPool();
+		client->iAccessCount++;
+		UnlockPool();
+		}
+
+	Kern::MutexSignal(*iProcessLock);
+
+	return r;
+	}
+
+DMemModelAlignedShPool::DMemModelAlignedShPool() :	DMemModelShPool()
+
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::DMemModelAlignedShPool"));
+	}
+
+void DMemModelAlignedShPool::Free(DShBuf* aBuf)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::Free (aBuf = 0x%08x)", aBuf));
+
+	LockPool();
+#ifdef _DEBUG
+	// Remove from allocated list
+	aBuf->iObjLink.Deque();
+#endif
+
+	DMemModelAlignedShBuf* buf = reinterpret_cast<DMemModelAlignedShBuf*>(aBuf);
+
+	if (MM::MemoryIsNotMapped(buf->iMemoryObject))
+		{
+		UnlockPool(); // have to release fast mutex
+		MM::MemoryWipe(buf->iMemoryObject);
+		LockPool();
+
+		// we want to put the initial buffers at the head of the free list
+		// and the grown buffers at the tail as this makes shrinking more efficient
+		if (aBuf >= iInitialBuffersArray && aBuf < (iInitialBuffersArray + iInitialBuffers))
+			{
+			iFreeList.AddHead(&aBuf->iObjLink);
+			}
+		else
+			{
+			iFreeList.Add(&aBuf->iObjLink);
+			}
+		++iFreeBuffers;
+#ifdef _DEBUG
+		--iAllocatedBuffers;
+#endif
+		}
+	else
+		{
+		iPendingList.Add(&aBuf->iObjLink);
+		}
+
+	iPoolFlags &= ~EShPoolSuppressShrink;		// Allow shrinking again, if it was blocked
+	UnlockPool();
+
+	// queue ManagementDfc which completes notifications as appropriate
+	if (HaveWorkToDo())
+		KickManagementDfc();
+
+	DShPool::Close(NULL); // decrement pool reference count
+	}
+
+TInt DMemModelAlignedShPool::UpdateFreeList()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::UpdateFreeList"));
+
+	LockPool();
+	SDblQueLink* pLink = iPendingList.First();
+	UnlockPool();
+
+	SDblQueLink* anchor = &iPendingList.iA;
+
+	while (pLink != anchor)
+		{
+		DMemModelAlignedShBuf* buf = _LOFF(pLink, DMemModelAlignedShBuf, iObjLink);
+		LockPool();
+		pLink = pLink->iNext;
+		UnlockPool();
+
+		if (MM::MemoryIsNotMapped(buf->iMemoryObject))
+			{
+			LockPool();
+			buf->iObjLink.Deque();
+			UnlockPool();
+
+			MM::MemoryWipe(buf->iMemoryObject);
+
+			LockPool();
+			if (buf >= iInitialBuffersArray && buf < (iInitialBuffersArray + iInitialBuffers))
+				{
+				iFreeList.AddHead(&buf->iObjLink);
+				}
+			else
+				{
+				iFreeList.Add(&buf->iObjLink);
+				}
+			++iFreeBuffers;
+#ifdef _DEBUG
+			--iAllocatedBuffers;
+#endif
+			UnlockPool();
+			}
+		}
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelAlignedShPool::UpdateFreeList"));
+	return KErrNone;
+	}
+
+DMemModelAlignedShPool::~DMemModelAlignedShPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::~DMemModelAlignedShPool"));
+	}
+
+TInt DMemModelAlignedShPool::DoCreate(TShPoolCreateInfo& aInfo)
+	{
+
+	TUint64 maxSize64 = static_cast<TUint64>(aInfo.iInfo.iMaxBufs) * static_cast<TUint64>(iBufGap);
+
+	if (maxSize64 > static_cast<TUint64>(KMaxTInt) || maxSize64 <= static_cast<TUint64>(0))
+		return KErrArgument;
+
+	iMaxPages = MM::RoundToPageCount(static_cast<TInt>(maxSize64));
+
+	return KErrNone;
+	}
+
+TInt DMemModelAlignedShPool::DestroyAllMappingsAndReservedHandles(DProcess* aProcess)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::DestroyAllMappingsAndReservedHandles(0x%08x)", aProcess));
+
+	TInt r = KErrNone;
+	Kern::MutexWait(*iProcessLock);
+	DMemModelAlignedShPoolClient* client = reinterpret_cast<DMemModelAlignedShPoolClient*>(iClientMap->Remove(reinterpret_cast<TUint>(aProcess)));
+
+	__NK_ASSERT_DEBUG(client);
+	__NK_ASSERT_DEBUG(client->iAccessCount == 0);
+
+	DestroyMappings(client, KMaxTInt);
+	delete client;
+
+	if (aProcess != K::TheKernelProcess)
+		{
+		// Remove reserved handles
+		r = aProcess->iHandles.Reserve(-iTotalBuffers);
+		}
+
+	Kern::MutexSignal(*iProcessLock);
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelAlignedShPool::DestroyAllMappingsAndReservedHandles(0x%08x)", aProcess));
+
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::DestroyMappings(DMemModelAlignedShPoolClient* aClient, TInt aNoOfMappings)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::DestroyMappings(0x%08x)", aClient));
+
+	TInt r = KErrNone;
+	TInt i = 0;
+
+	DShBufMapping* m = NULL;
+	SDblQueLink* pLink = NULL;
+
+	while (i < aNoOfMappings && !aClient->iMappingFreeList.IsEmpty())
+		{
+		LockPool();
+		pLink = aClient->iMappingFreeList.GetFirst();
+		UnlockPool();
+
+		if (pLink == NULL)
+			break;
+
+		m = _LOFF(pLink, DShBufMapping, iObjLink);
+		__KTRACE_OPT(KMMU2, Kern::Printf("DMemModelAlignedShPool::DestroyMappings delete 0x%08x",m));
+		MM::MappingClose(m->iMapping);
+		delete m;
+		++i;
+		}
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<MemModelAlignedShPool::DestroyMappings"));
+
+	return r;
+	}
+
+
+TInt DMemModelAlignedShPool::CreateMappings(DMemModelAlignedShPoolClient* aClient, TInt aNoOfMappings, DMemModelProcess* aProcess)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::CreateMappings"));
+
+	__ASSERT_MUTEX(iProcessLock);
+
+	TInt r = KErrNone;
+
+	for (TInt i = 0; i < aNoOfMappings; ++i)
+		{
+		DShBufMapping* mapping;
+		r = MappingNew(mapping, aProcess);
+		if (r == KErrNone)
+			{
+			LockPool();
+			aClient->iMappingFreeList.AddHead(&mapping->iObjLink);
+			UnlockPool();
+			}
+		else
+			{
+			r = KErrNoMemory;
+			break;
+			}
+		}
+
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::UpdateMappingsAndReservedHandles(TInt aNoOfBuffers)
+	{
+	__KTRACE_OPT(KMMU2, Kern::Printf(">DMemModelAlignedShPool::UpdateMappingsAndReservedHandles(0x%08x)", aNoOfBuffers));
+
+	SMap::TIterator iter(*iClientMap);
+	SMap::TEntry* entry;
+	SMap::TEntry* lastEntry = NULL;
+	DMemModelProcess* pP;
+	DMemModelAlignedShPoolClient* client;
+	TInt result = KErrNone;
+
+	Kern::MutexWait(*iProcessLock);
+
+	// First handle the case of increasing allocation
+	if (aNoOfBuffers > 0)
+		while ((entry = iter.Next()) != lastEntry)
+			{
+			// Try to update handle reservation; skip if process is null or has gone away
+			client = (DMemModelAlignedShPoolClient*)(entry->iObj);
+			pP = (DMemModelProcess*)(entry->iKey);
+			if (!pP)
+				continue;
+			TInt r = pP->iHandles.Reserve(aNoOfBuffers);
+			if (r)
+				__KTRACE_OPT(KMMU2, Kern::Printf("?DMemModelAlignedShPool::UpdateMappingsAndReservedHandles(0x%08x) Reserve failed %d", aNoOfBuffers, r));
+			if (r == KErrDied)
+				continue;
+
+			if (r == KErrNone && client->iWindowSize <= 0)
+				{
+				// A positive window size means the number of mappings is fixed, so we don't need to reserve more.
+				// But here zero or negative means a variable number, so we need to create extra mappings now.
+				r = CreateMappings(client, aNoOfBuffers, pP);
+				if (r != KErrNone)
+					{
+					__KTRACE_OPT(KMMU2, Kern::Printf("?DMemModelAlignedShPool::UpdateMappingsAndReservedHandles(0x%08x) CreateMappings failed %d", aNoOfBuffers, r));
+					pP->iHandles.Reserve(-aNoOfBuffers); // Creation failed, so release the handles reserved above
+					}
+				}
+
+			if (r != KErrNone)
+				{
+				// Some problem; cleanup as best we can by falling into the loop below to undo what we've done
+				result = r;
+				iter.Reset();
+				lastEntry = entry;
+				aNoOfBuffers = -aNoOfBuffers;
+				break;
+				}
+			}
+
+	// Now handle the case of decreasing allocation; also used for recovery from errors, in which case
+	// this loop iterates only over the elements that were *successfully* processed by the loop above
+	if (aNoOfBuffers < 0)
+		while ((entry = iter.Next()) != lastEntry)
+			{
+			// Try to update handle reservation; skip if process is null or has gone away
+			client = (DMemModelAlignedShPoolClient*)(entry->iObj);
+			pP = (DMemModelProcess*)(entry->iKey);
+			if (!pP)
+				continue;
+			TInt r = pP->iHandles.Reserve(aNoOfBuffers);
+			if (r == KErrDied)
+				continue;
+
+			if (r == KErrNone && client->iWindowSize <= 0)
+				r = DestroyMappings(client, -aNoOfBuffers);
+			// De-allocation by Reserve(-n) and/or DestroyMappings() should never fail
+			if (r != KErrNone)
+				Kern::PanicCurrentThread(KLitDMemModelAlignedShPool, r);
+			}
+
+	Kern::MutexSignal(*iProcessLock);
+
+	__KTRACE_OPT(KMMU2, Kern::Printf("<DMemModelAlignedShPool::UpdateMappingsAndReservedHandles(0x%08x) returning %d", aNoOfBuffers, result));
+	return result;
+	}
+
+TInt DMemModelAlignedShPool::DeleteInitialBuffers()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::DeleteInitialBuffers"));
+
+	if (iInitialBuffersArray != NULL)
+		{
+		for (TUint i = 0; i < iInitialBuffers; i++)
+			{
+			iInitialBuffersArray[i].iObjLink.Deque(); // remove from free list
+			iInitialBuffersArray[i].Dec();
+			iInitialBuffersArray[i].~DMemModelAlignedShBuf();
+			}
+		}
+
+	Kern::Free(iInitialBuffersArray);
+	iInitialBuffersArray = NULL;
+
+	return KErrNone;
+	}
+
+TInt DMemModelAlignedShPool::Close(TAny* aPtr)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::Close(0x%08x)", aPtr));
+
+	if (aPtr)
+		{
+		DProcess* pP = reinterpret_cast<DProcess*>(aPtr);
+
+		CloseClient(pP);
+		}
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelAlignedShPool::Close(0x%08x)", aPtr));
+	return DShPool::Close(aPtr);
+	}
+
+TInt DMemModelAlignedShPool::CreateInitialBuffers()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::CreateInitialBuffers"));
+
+	iInitialBuffersArray = reinterpret_cast<DMemModelAlignedShBuf*>(Kern::Alloc(iInitialBuffers * sizeof(DMemModelAlignedShBuf)));
+
+	if (iInitialBuffersArray == NULL)
+		return KErrNoMemory;
+
+	for (TUint i = 0; i < iInitialBuffers; i++)
+		{
+		// always use kernel linear address in DShBuf
+		DMemModelAlignedShBuf *buf = new (&iInitialBuffersArray[i]) DMemModelAlignedShBuf(this);
+		TInt r = buf->Construct();
+
+		if (r == KErrNone)
+			{
+			iFreeList.Add(&buf->iObjLink);
+			}
+		else
+			{
+			iInitialBuffers = i;
+			return KErrNoMemory;
+			}
+		}
+
+	iFreeBuffers  = iInitialBuffers;
+	iTotalBuffers = iInitialBuffers;
+	return KErrNone;
+	}
+
+
+TInt DMemModelAlignedShPool::GrowPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::GrowPool()"));
+	TInt r = KErrNone;
+	SDblQue temp;
+
+	Kern::MutexWait(*iProcessLock);
+
+	TUint32 headroom = iMaxBuffers - iTotalBuffers;
+
+	// How many buffers to grow by?
+	TUint32 grow = mult_fx248(iTotalBuffers, iGrowByRatio);
+	if (grow == 0)			// Handle round-to-zero
+		grow = 1;
+	if (grow > headroom)
+		grow = headroom;
+
+	TUint i;
+	for (i = 0; i < grow; ++i)
+		{
+		DMemModelAlignedShBuf *buf = new DMemModelAlignedShBuf(this);
+
+		if (buf == NULL)
+			{
+			r = KErrNoMemory;
+			break;
+			}
+
+		TInt r = buf->Construct();
+
+		if (r != KErrNone)
+			{
+			buf->DObject::Close(NULL);
+			break;
+			}
+
+		temp.Add(&buf->iObjLink);
+		}
+
+	r = UpdateMappingsAndReservedHandles(i);
+
+	if (r == KErrNone)
+		{
+		LockPool();
+		iFreeList.MoveFrom(&temp);
+		iFreeBuffers += i;
+		iTotalBuffers += i;
+		UnlockPool();
+		}
+	else
+		{
+		// couldn't create either the mappings or reserve handles so have no choice but to
+		// delete the buffers
+		SDblQueLink *pLink;
+		while ((pLink = temp.GetFirst()) != NULL)
+			{
+			DShBuf* buf = _LOFF(pLink, DShBuf, iObjLink);
+			buf->DObject::Close(NULL);
+			}
+		}
+
+	CalculateGrowShrinkTriggers();
+
+	Kern::MutexSignal(*iProcessLock);
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelAlignedShPool::GrowPool()"));
+	return r;
+	}
+
+TInt DMemModelAlignedShPool::ShrinkPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::ShrinkPool()"))
+
+	Kern::MutexWait(*iProcessLock);
+
+	TUint32 grownBy = iTotalBuffers - iInitialBuffers;
+
+	// How many buffers to shrink by?
+	TUint32 shrink = mult_fx248(iTotalBuffers, iShrinkByRatio);
+	if (shrink == 0)		// Handle round-to-zero
+		shrink = 1;
+	if (shrink > grownBy)
+		shrink = grownBy;
+	if (shrink > iFreeBuffers)
+		shrink = iFreeBuffers;
+
+	// work backwards as the grown buffers should be at the back
+	TUint i;
+	for (i = 0; i < shrink; i++)
+		{
+		LockPool();
+
+		if (iFreeList.IsEmpty())
+			{
+			UnlockPool();
+			break;
+			}
+
+		DShBuf* buf = _LOFF(iFreeList.Last(), DShBuf, iObjLink);
+
+		// can't delete initial buffers
+		if (buf >= iInitialBuffersArray && buf < (iInitialBuffersArray + iInitialBuffers))
+			{
+			UnlockPool();
+			break;
+			}
+
+		buf->iObjLink.Deque();
+		--iFreeBuffers;
+		--iTotalBuffers;
+		UnlockPool();
+		buf->DObject::Close(NULL);
+		}
+
+	TInt r = UpdateMappingsAndReservedHandles(-i);
+
+	// If we couldn't shrink the pool by this many buffers, wait until we Free() another
+	// buffer before trying to shrink again.
+	if (i < shrink)
+		iPoolFlags |= EShPoolSuppressShrink;
+
+	CalculateGrowShrinkTriggers();
+
+	Kern::MutexSignal(*iProcessLock);
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelAlignedShPool::ShrinkPool()"));
+	return r;
+	}
+
+// Kernel side API
+TInt DMemModelAlignedShPool::Alloc(DShBuf*& aShBuf)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelAlignedShPool::Alloc (DShBuf)"));
+
+	TInt r = KErrNoMemory;
+	aShBuf = NULL;
+
+	LockPool();
+
+	if (!iFreeList.IsEmpty())
+		{
+		aShBuf = _LOFF(iFreeList.GetFirst(), DShBuf, iObjLink);
+
+#ifdef _DEBUG
+		iAllocated.Add(&aShBuf->iObjLink);
+		iAllocatedBuffers++;
+#endif
+		--iFreeBuffers;
+		Open(); // increment pool reference count
+		r = KErrNone;
+		}
+
+	UnlockPool();
+
+	if (HaveWorkToDo())
+		KickManagementDfc();
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelAlignedShPool::Alloc return buf = 0x%08x", aShBuf));
+	return r;
+	}
+
+DMemModelNonAlignedShBuf::DMemModelNonAlignedShBuf(DShPool* aPool, TLinAddr aRelAddr) : DShBuf(aPool, aRelAddr)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShBuf::DMemModelNonAlignedShBuf()"));
+	}
+
+DMemModelNonAlignedShBuf::~DMemModelNonAlignedShBuf()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShBuf::~DMemModelNonAlignedShBuf()"));
+	}
+
+TInt DMemModelNonAlignedShBuf::Close(TAny* aPtr)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShBuf::Close(0x%08x)", aPtr));
+
+	if (aPtr)
+		{
+		DProcess* pP = reinterpret_cast<DProcess*>(aPtr);
+
+		// there no per buffer resources for kernel clients for non-aligned buffers
+		if (pP != K::TheKernelProcess)
+		    iPool->CloseClient(pP);
+		}
+
+	return DShBuf::Close(aPtr);
+	}
+
+TInt DMemModelNonAlignedShBuf::AddToProcess(DProcess* aProcess, TUint /* aAttr */)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf("Adding DMemModelShBuf %O to process %O", this, aProcess));
+	TUint flags;
+
+	return iPool->OpenClient(aProcess, flags);
+	}
+
+
+TUint8* DMemModelNonAlignedShBuf::Base(DProcess* aProcess)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShBuf::Base(0x%x)", aProcess));
+
+	TUint8* base = reinterpret_cast<DMemModelNonAlignedShPool*>(iPool)->Base(aProcess) + (TUint)iRelAddress;
+
+	return base;
+	}
+
+TUint8* DMemModelNonAlignedShBuf::Base()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShBuf::Base()"));
+
+	TUint8* base = reinterpret_cast<DMemModelNonAlignedShPool*>(iPool)->Base();
+
+	return base ? base + iRelAddress : NULL;
+	}
+
+TInt DMemModelNonAlignedShBuf::Map(TUint /* aMapAttr */, DProcess* /* aProcess */, TLinAddr& /* aBase */)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShBuf::Map()"));
+
+	return KErrNotSupported;
+	}
+
+TInt DMemModelNonAlignedShBuf::UnMap(DProcess* /* aProcess */)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShBuf::UnMap()"));
+
+	return KErrNotSupported;
+	}
+
+TInt DMemModelNonAlignedShBuf::Pin(TPhysicalPinObject* aPinObject, TBool aReadOnly, TPhysAddr& aAddress, TPhysAddr* aPages, TUint32& aMapAttr, TUint& aColour)
+	{
+	CHECK_PRECONDITIONS(MASK_THREAD_CRITICAL,"DMemModelNonAlignedShBuf::Pin");
+
+	DMemModelNonAlignedShPool* pool = reinterpret_cast<DMemModelNonAlignedShPool*>(iPool);
+
+	NKern::ThreadEnterCS();
+
+	TInt startPage = iRelAddress >> KPageShift;
+	TInt lastPage = MM::RoundToPageCount(iRelAddress + Size());
+
+	TInt pages = lastPage - startPage;
+
+	if (!pages) pages++;
+
+	TInt r = MM::PinPhysicalMemory(pool->iMemoryObject, (DPhysicalPinMapping*)aPinObject,
+									startPage, pages, aReadOnly, aAddress, aPages, aMapAttr, aColour);
+
+	// adjust physical address to start of the buffer
+	if (r == KErrNone)
+		{
+		aAddress += (iRelAddress - (startPage << KPageShift));
+		}
+	NKern::ThreadLeaveCS();
+	return r;
+	}
+
+DMemModelNonAlignedShPool::DMemModelNonAlignedShPool() : DMemModelShPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::DMemModelNonAlignedShPool"));
+	}
+
+DMemModelNonAlignedShPool::~DMemModelNonAlignedShPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::~DMemModelNonAlignedShPool"));
+
+	MM::MemoryDestroy(iMemoryObject);
+
+	delete iPagesMap;
+	delete iBufMap;
+	}
+
+TInt DMemModelNonAlignedShPool::DoCreate(TShPoolCreateInfo& aInfo)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf("DMemModelNonAlignedShPool::DoCreate(%d, %d, %d)", aInfo.iInfo.iMaxBufs, iBufGap, iBufSize));
+
+	TInt r;
+	TUint64 maxSize64 = static_cast<TUint64>(aInfo.iInfo.iMaxBufs) * static_cast<TUint64>(iBufGap);
+
+	if (maxSize64 > static_cast<TUint64>(KMaxTInt) || maxSize64 <= static_cast<TUint64>(0))
+		return KErrArgument;
+
+	TInt maxPages = MM::RoundToPageCount(static_cast<TInt>(maxSize64));
+
+	iBufMap = TBitMapAllocator::New(aInfo.iInfo.iMaxBufs, (TBool)ETrue);
+	if (iBufMap == NULL)
+		return KErrNoMemory;
+
+	iPagesMap = TBitMapAllocator::New(maxPages, (TBool)ETrue);
+	if (iPagesMap == NULL)
+		return KErrNoMemory;
+
+	// Memory attributes
+	TMemoryAttributes attr = EMemoryAttributeStandard;
+
+	// Memory type
+	TMemoryObjectType memoryType = (iPoolFlags & EShPoolPhysicalMemoryPool) ? EMemoryObjectHardware : EMemoryObjectUnpaged;
+
+	// Memory flags
+	TMemoryCreateFlags memoryFlags = EMemoryCreateDefault;	// Don't leave previous contents of memory
+
+	// Now create the memory object
+	r = MM::MemoryNew(iMemoryObject, memoryType, maxPages, memoryFlags, attr);
+	if (r != KErrNone)
+		return r;
+
+	// Make sure we give the caller the number of buffers they were expecting
+	iCommittedPages = MM::RoundToPageCount(iInitialBuffers * iBufGap);
+
+	if (iPoolFlags & EShPoolPhysicalMemoryPool)
+		{
+		__KTRACE_OPT(KMMU, Kern::Printf("DMemModelNonAlignedShPool::DoCreate(iCommittedPages = 0x%08x, aInfo.iPhysAddr.iPhysAddrList = 0x%08x )", iCommittedPages, aInfo.iPhysAddr.iPhysAddrList));
+		if (iPoolFlags & EShPoolContiguous)
+			{
+			r = MM::MemoryAddContiguous(iMemoryObject, 0, iCommittedPages, aInfo.iPhysAddr.iPhysAddr);
+			}
+		else
+			{
+			r = MM::MemoryAddPages(iMemoryObject, 0, iCommittedPages, aInfo.iPhysAddr.iPhysAddrList);
+			}
+
+		iMaxPages = iCommittedPages;
+		}
+	else
+		{
+		__KTRACE_OPT(KMMU, Kern::Printf("DMemModelNonAlignedShPool::DoCreate(iCommittedPages = %d, contig = %d)", iCommittedPages, iPoolFlags & EShPoolContiguous));
+
+		if (iPoolFlags & EShPoolContiguous)
+			{
+			TPhysAddr paddr;
+			r = MM::MemoryAllocContiguous(iMemoryObject, 0, iCommittedPages, 0, paddr);
+			}
+		else
+			{
+			r = MM::MemoryAlloc(iMemoryObject, 0, iCommittedPages);
+			}
+
+		iMaxPages = maxPages;
+		}
+
+	iPagesMap->Alloc(0, iCommittedPages);
+	
+	return r;
+	}
+
+TUint8* DMemModelNonAlignedShPool::Base(DProcess* aProcess)
+	{
+	TUint8 *base = 0;
+
+	LockPool();
+	DMemModelNonAlignedShPoolClient* client = reinterpret_cast<DMemModelNonAlignedShPoolClient*>(iClientMap->Find(reinterpret_cast<TUint>(aProcess)));
+
+	__NK_ASSERT_DEBUG(client); // ASSERT because pool must be already opened in the clients address space
+	__NK_ASSERT_DEBUG(client->iMapping); // ASSERT because non-aligned buffers are mapped by default in user space
+
+	base = reinterpret_cast<TUint8*>(MM::MappingBase(client->iMapping));
+
+	UnlockPool();
+
+	return base;
+	}
+
+TInt DMemModelNonAlignedShPool::CreateInitialBuffers()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::CreateInitialBuffers"));
+
+	iInitialBuffersArray = reinterpret_cast<DMemModelNonAlignedShBuf*>(Kern::Alloc(iInitialBuffers * sizeof(DMemModelNonAlignedShBuf)));
+
+	if (iInitialBuffersArray == NULL)
+		return KErrNoMemory;
+
+	TLinAddr offset = 0;
+	for (TUint i = 0; i < iInitialBuffers; i++)
+		{
+		DMemModelNonAlignedShBuf *buf = new (&iInitialBuffersArray[i]) DMemModelNonAlignedShBuf(this, offset);
+		TInt r = buf->Construct();
+
+		if (r == KErrNone)
+			{
+			iFreeList.Add(&buf->iObjLink);
+			}
+		else
+			{
+			iInitialBuffers = i;
+			return KErrNoMemory;
+			}
+
+		offset += iBufGap;
+		}
+
+	iFreeBuffers  = iInitialBuffers;
+	iTotalBuffers = iInitialBuffers;
+	iBufMap->Alloc(0, iInitialBuffers);
+
+	return KErrNone;
+	}
+
+TInt DMemModelNonAlignedShPool::AddToProcess(DProcess* aProcess, TUint aAttr)
+	{
+	// Must be in critical section so we don't leak os asid references.
+	__ASSERT_CRITICAL;
+	__KTRACE_OPT(KMMU, Kern::Printf("Adding DMemModelShPool %O to process %O", this, aProcess));
+
+	DMemoryMapping* mapping = NULL;
+
+	TBool write = (TBool)EFalse;
+
+	// User = ETrue, ReadOnlyWrite = ETrue, Execute = EFalse
+	if (aAttr & EShPoolWriteable)
+		write = (TBool)ETrue;
+
+	TMappingPermissions perm = MM::MappingPermissions(ETrue,	// user
+													  write,	// writeable
+													  EFalse);	// execute
+
+	TMappingCreateFlags mappingFlags = EMappingCreateDefault;
+
+	DMemModelProcess* pP = reinterpret_cast<DMemModelProcess*>(aProcess);
+
+	Kern::MutexWait(*iProcessLock);
+	TInt r = KErrNone;
+
+	LockPool();
+	DMemModelNonAlignedShPoolClient* client = reinterpret_cast<DMemModelNonAlignedShPoolClient*>(iClientMap->Find(reinterpret_cast<TUint>(aProcess)));
+	UnlockPool();
+
+	if (!client)
+		{
+		client = new DMemModelNonAlignedShPoolClient;
+
+		if (client)
+			{
+			// map non aligned pools in userside processes by default
+			if (aAttr & EShPoolAutoMapBuf || pP != K::TheKernelProcess)
+				{
+				// Open a reference on the os asid so it doesn't get freed and reused.
+				TInt osAsid = pP->TryOpenOsAsid();
+				if (osAsid < 0)
+					{// The process freed its os asid so can't create a new mapping.
+					r = KErrDied;
+					}
+				else
+					{
+					r = MM::MappingNew(mapping, iMemoryObject, perm, osAsid, mappingFlags);
+					// Close the reference as the mapping will be destroyed if the process dies.
+					pP->CloseOsAsid();
+					}
+
+				if ((r == KErrNone) && (pP == K::TheKernelProcess))
+					{
+					iBaseAddress = MM::MappingBase(mapping);
+					}
+				}
+
+			if (r == KErrNone)
+				{
+				client->iMapping = mapping;
+				client->iFlags = aAttr;
+				r = iClientMap->Add(reinterpret_cast<TUint>(aProcess), client);
+
+				if (r == KErrNone)
+					{
+					if (pP != K::TheKernelProcess)
+						{
+						r = aProcess->iHandles.Reserve(iTotalBuffers);
+
+						if (r != KErrNone)
+							{
+							iClientMap->Remove(reinterpret_cast<TUint>(aProcess));
+							}
+						}
+					}
+
+				if (r != KErrNone)
+					{
+					delete client;
+					MM::MappingDestroy(mapping);
+					}
+				}
+			else
+				{
+				delete client;
+				}
+			}
+		else
+			{
+			r = KErrNoMemory;
+			}
+		}
+	else
+		{
+		LockPool();
+		client->iAccessCount++;
+		UnlockPool();
+		}
+
+	Kern::MutexSignal(*iProcessLock);
+
+	return r;
+	}
+
+TInt DMemModelNonAlignedShPool::DeleteInitialBuffers()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::DeleteInitialBuffers"));
+
+	if (iInitialBuffersArray != NULL)
+		{
+		for (TUint i = 0; i < iInitialBuffers; i++)
+			{
+			iInitialBuffersArray[i].iObjLink.Deque(); // remove from free list
+			iInitialBuffersArray[i].Dec();
+			iInitialBuffersArray[i].~DMemModelNonAlignedShBuf();
+			}
+		}
+
+	Kern::Free(iInitialBuffersArray);
+	iInitialBuffersArray = NULL;
+
+	return KErrNone;
+	}
+
+TInt DMemModelNonAlignedShPool::DestroyAllMappingsAndReservedHandles(DProcess* aProcess)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::DestroyAllMappingsAndReservedHandles(0x%08x)", aProcess));
+
+	TInt r = KErrNone;
+	Kern::MutexWait(*iProcessLock);
+	DMemModelNonAlignedShPoolClient* client = reinterpret_cast<DMemModelNonAlignedShPoolClient*>(iClientMap->Remove(reinterpret_cast<TUint>(aProcess)));
+
+	__NK_ASSERT_DEBUG(client);
+	__NK_ASSERT_DEBUG(client->iAccessCount == 0);
+
+	if (client->iMapping)
+		{
+		MM::MappingDestroy(client->iMapping);
+		}
+	delete client;
+
+	if (aProcess != K::TheKernelProcess)
+		{
+		// Remove reserved handles
+		r = aProcess->iHandles.Reserve(-(iTotalBuffers));
+		}
+	else
+		{
+		iBaseAddress = 0;
+		}
+
+	Kern::MutexSignal(*iProcessLock);
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelNonAlignedShPool::DestroyAllMappingsAndReservedHandles(0x%08x)", aProcess));
+
+	return r;
+	}
+
+
+TInt DMemModelNonAlignedShPool::Close(TAny* aPtr)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::Close(0x%08x)", aPtr));
+
+	if (aPtr)
+		{
+		DProcess* pP = reinterpret_cast<DProcess*>(aPtr);
+
+		CloseClient(pP);
+		}
+
+	return DShPool::Close(aPtr);
+	}
+
+void DMemModelNonAlignedShPool::FreeBufferPages(TUint aOffset)
+	{
+	TLinAddr firstByte = aOffset;	// offset of first byte in buffer
+	TLinAddr lastByte = firstByte+iBufGap-1;	// offset of last byte in buffer
+	TUint firstPage = firstByte>>KPageShift;	// index of first page containing part of the buffer
+	TUint lastPage = lastByte>>KPageShift;		// index of last page containing part of the buffer
+
+	TUint firstBuffer = (firstByte&~KPageMask)/iBufGap; // index of first buffer which lies in firstPage
+	TUint lastBuffer = (lastByte|KPageMask)/iBufGap;    // index of last buffer which lies in lastPage
+	TUint thisBuffer = firstByte/iBufGap;				// index of the buffer to be freed
+
+	// Ensure lastBuffer is within bounds (there may be room in the last
+	// page for more buffers than we have allocated).
+	if (lastBuffer >= iMaxBuffers)
+		lastBuffer = iMaxBuffers-1;
+
+	if(firstBuffer!=thisBuffer && iBufMap->NotFree(firstBuffer,thisBuffer-firstBuffer))
+		{
+		// first page has other allocated buffers in it,
+		// so we can't free it and must move on to next one...
+		if (firstPage >= lastPage)
+			return;
+		++firstPage;
+		}
+
+	if(lastBuffer!=thisBuffer && iBufMap->NotFree(thisBuffer+1,lastBuffer-thisBuffer))
+		{
+		// last page has other allocated buffers in it,
+		// so we can't free it and must step back to previous one...
+		if (lastPage <= firstPage)
+			return;
+		--lastPage;
+		}
+
+	if(firstPage<=lastPage)
+		{
+		// we can free pages firstPage trough to lastPage...
+		TUint numPages = lastPage-firstPage+1;
+		iPagesMap->SelectiveFree(firstPage,numPages);
+		MM::MemoryLock(iMemoryObject);
+		MM::MemoryFree(iMemoryObject, firstPage, numPages);
+		MM::MemoryUnlock(iMemoryObject);
+		iCommittedPages -= numPages;
+		}
+	}
+
+TInt DMemModelNonAlignedShPool::GrowPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::GrowPool()"));
+
+	// Don't do anything with physical memory pools
+	if (iPoolFlags & EShPoolPhysicalMemoryPool)
+		return KErrNone;
+
+	Kern::MutexWait(*iProcessLock);
+
+	TUint32 headroom = iMaxBuffers - iTotalBuffers;
+
+	// How many buffers to grow by?
+	TUint32 grow = mult_fx248(iTotalBuffers, iGrowByRatio);
+	if (grow == 0)			// Handle round-to-zero
+		grow = 1;
+	if (grow > headroom)
+		grow = headroom;
+
+	TInt r = KErrNone;
+	SDblQue temp;
+
+	TUint i;
+	for (i = 0; i < grow; ++i)
+		{
+		TInt offset = iBufMap->Alloc();
+
+		if (offset < 0)
+			{
+			r = KErrNoMemory;
+			break;
+			}
+
+		offset *= iBufGap;
+
+		TInt lastPage = (offset + iBufSize - 1) >> KPageShift;
+
+		// Allocate one page at a time.
+		for (TInt page = offset >> KPageShift; page <= lastPage; ++page)
+			{
+			// Is the page allocated?
+			if (iPagesMap->NotAllocated(page, 1))
+				{
+				MM::MemoryLock(iMemoryObject);
+				r = MM::MemoryAlloc(iMemoryObject, page, 1);
+				MM::MemoryUnlock(iMemoryObject);
+
+				if (r != KErrNone)
+					{
+					break;
+					}
+
+				++iCommittedPages;
+				iPagesMap->Alloc(page, 1);
+				}
+			}
+
+		if (r != KErrNone)
+			{
+			iBufMap->Free(offset / iBufGap);
+			FreeBufferPages(offset);
+			break;
+			}
+
+		DMemModelNonAlignedShBuf *buf = new DMemModelNonAlignedShBuf(this, offset);
+
+		if (buf == NULL)
+			{
+			iBufMap->Free(offset / iBufGap);
+			FreeBufferPages(offset);
+			r = KErrNoMemory;
+			break;
+			}
+
+		r = buf->Construct();
+
+		if (r != KErrNone)
+			{
+			iBufMap->Free(offset / iBufGap);
+			FreeBufferPages(offset);
+			buf->DObject::Close(NULL);
+			break;
+			}
+
+		temp.Add(&buf->iObjLink);
+		}
+
+	r = UpdateReservedHandles(i);
+
+	if (r == KErrNone)
+		{
+		LockPool();
+		iFreeList.MoveFrom(&temp);
+		iFreeBuffers += i;
+		iTotalBuffers += i;
+		UnlockPool();
+		}
+	else
+		{
+		// couldn't reserve handles so have no choice but to
+		// delete the buffers
+		__KTRACE_OPT(KMMU, Kern::Printf("GrowPool failed with %d, deleting buffers", r));
+		SDblQueLink *pLink;
+		while ((pLink = temp.GetFirst()) != NULL)
+			{
+			DShBuf* buf = _LOFF(pLink, DShBuf, iObjLink);
+			TLinAddr offset = buf->iRelAddress;
+			iBufMap->Free(offset / iBufGap);
+			FreeBufferPages(offset);
+			buf->DObject::Close(NULL);
+			}
+		__KTRACE_OPT(KMMU, Kern::Printf("Buffers deleted"));
+		}
+
+	CalculateGrowShrinkTriggers();
+
+	Kern::MutexSignal(*iProcessLock);
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelNonAlignedShPool::GrowPool()"));
+	return r;
+	}
+
+TInt DMemModelNonAlignedShPool::ShrinkPool()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::ShrinkPool()"));
+
+	// Don't do anything with physical memory pools
+	if (iPoolFlags & EShPoolPhysicalMemoryPool)
+		return KErrNone;
+
+	Kern::MutexWait(*iProcessLock);
+
+	TUint32 grownBy = iTotalBuffers - iInitialBuffers;
+
+	// How many buffers to shrink by?
+	TUint32 shrink = mult_fx248(iTotalBuffers, iShrinkByRatio);
+	if (shrink == 0)		// Handle round-to-zero
+		shrink = 1;
+	if (shrink > grownBy)
+		shrink = grownBy;
+	if (shrink > iFreeBuffers)
+		shrink = iFreeBuffers;
+
+	TUint i;
+	for (i = 0; i < shrink; ++i)
+		{
+		LockPool();
+
+		if (iFreeList.IsEmpty())
+			{
+			UnlockPool();
+			break;
+			}
+
+		// work from the back of the queue
+		SDblQueLink *pLink = iFreeList.Last();
+
+		DShBuf* pBuf = _LOFF(pLink, DShBuf, iObjLink);
+
+		if (pBuf >= iInitialBuffersArray && pBuf < (iInitialBuffersArray + iInitialBuffers))
+			{
+			UnlockPool();
+			break;
+			}
+
+		--iFreeBuffers;
+		--iTotalBuffers;
+		pLink->Deque();
+		UnlockPool();
+
+		TLinAddr offset = pBuf->iRelAddress;
+		iBufMap->Free(offset / iBufGap);
+		FreeBufferPages(offset);
+
+		pBuf->DObject::Close(NULL);
+		}
+
+	UpdateReservedHandles(-(TInt)i);
+
+	// If we couldn't shrink the pool by this many buffers, wait until we Free() another
+	// buffer before trying to shrink again.
+	if (i < shrink)
+		iPoolFlags |= EShPoolSuppressShrink;
+
+	CalculateGrowShrinkTriggers();
+
+	Kern::MutexSignal(*iProcessLock);
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelNonAlignedShPool::ShrinkPool()"));
+
+	return KErrNone;
+	}
+
+TInt DMemModelNonAlignedShPool::UpdateFreeList()
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::UpdateFreeList"));
+
+	SDblQue temp;
+
+	LockPool();
+	while(!iAltFreeList.IsEmpty())
+		{
+		// sort a temporary list of 'n' object with the lowest index first
+		for (TInt n = 0; n < 8 && !iAltFreeList.IsEmpty(); ++n)
+			{
+			// bit of an assumption, lets assume that the lower indexes will be allocated and freed first
+			// and therefore will be nearer the front of the list
+			DShBuf* buf = _LOFF(iAltFreeList.GetFirst(), DShBuf, iObjLink);
+
+			SDblQueLink* anchor = reinterpret_cast<SDblQueLink*>(&temp);
+			SDblQueLink* pLink = temp.Last();
+
+			while (ETrue)
+				{
+				// traverse the list starting at the back
+				if ((pLink != anchor) && (_LOFF(pLink, DShBuf, iObjLink)->iRelAddress > buf->iRelAddress))
+					{
+					pLink = pLink->iPrev;
+					}
+				else
+					{
+					buf->iObjLink.InsertAfter(pLink);
+					break;
+					}
+				}
+			}
+
+		// now merge with the free list
+		while(!temp.IsEmpty())
+			{
+			if (iFreeList.IsEmpty())
+				{
+				iFreeList.MoveFrom(&temp);
+				break;
+				}
+
+			// working backwards with the highest index
+			DShBuf* buf = _LOFF(temp.Last(), DShBuf, iObjLink);
+			SDblQueLink* anchor = reinterpret_cast<SDblQueLink*>(&iFreeList);
+			SDblQueLink* pLink = iFreeList.Last();
+
+			while (!NKern::FMFlash(&iLock))
+				{
+				if ((pLink != anchor) && (_LOFF(pLink, DShBuf, iObjLink)->iRelAddress > buf->iRelAddress))
+					{
+					pLink = pLink->iPrev;
+					}
+				else
+					{
+					buf->iObjLink.Deque();
+					buf->iObjLink.InsertAfter(pLink);
+					// next buffer
+					if (temp.IsEmpty())
+						break;
+					buf = _LOFF(temp.Last(), DShBuf, iObjLink);
+					}
+				}
+			}
+		NKern::FMFlash(&iLock);
+		}
+	UnlockPool();
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelNonAlignedShPool::UpdateFreeList"));
+	return KErrNone;
+	}
+
+void DMemModelNonAlignedShPool::Free(DShBuf* aBuf)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::Free (aBuf = 0x%08x, aBuf->Base() 0x%08x)", aBuf, aBuf->iRelAddress));
+
+	LockPool();
+#ifdef _DEBUG
+	// Remove from allocated list
+	aBuf->iObjLink.Deque();
+#endif
+
+	// we want to put the initial buffers at the head of the free list
+	// and the grown buffers at the tail as this makes shrinking more efficient
+	if (aBuf >= iInitialBuffersArray && aBuf < (iInitialBuffersArray + iInitialBuffers))
+		{
+		iFreeList.AddHead(&aBuf->iObjLink);
+		}
+	else
+		{
+		iAltFreeList.Add(&aBuf->iObjLink);
+		}
+
+	++iFreeBuffers;
+#ifdef _DEBUG
+	--iAllocatedBuffers;
+#endif
+	iPoolFlags &= ~EShPoolSuppressShrink;		// Allow shrinking again, if it was blocked
+	UnlockPool();
+
+	// queue ManagementDfc which completes notifications as appropriate
+	if (HaveWorkToDo())
+		KickManagementDfc();
+
+	DShPool::Close(NULL); // decrement pool reference count
+	}
+
+// Kernel side API
+TInt DMemModelNonAlignedShPool::Alloc(DShBuf*& aShBuf)
+	{
+	__KTRACE_OPT(KMMU, Kern::Printf(">DMemModelNonAlignedShPool::Alloc (DShBuf)"));
+
+	aShBuf = NULL;
+
+	LockPool();
+
+	if (!iFreeList.IsEmpty())
+		{
+		aShBuf = _LOFF(iFreeList.GetFirst(), DShBuf, iObjLink);
+#ifdef _DEBUG
+		iAllocated.Add(&aShBuf->iObjLink);
+		iAllocatedBuffers++;
+#endif
+		}
+	else
+		{
+		// try alternative free list
+		if (!iAltFreeList.IsEmpty())
+			{
+			aShBuf = _LOFF(iAltFreeList.GetFirst(), DShBuf, iObjLink);
+#ifdef _DEBUG
+			iAllocated.Add(&aShBuf->iObjLink);
+			iAllocatedBuffers++;
+#endif
+			}
+		else
+			{
+			UnlockPool();
+			KickManagementDfc(); // Try to grow
+			return KErrNoMemory;
+			}
+		}
+
+	--iFreeBuffers;
+	Open(); // increment pool reference count
+
+	UnlockPool();
+
+	if (HaveWorkToDo())
+		KickManagementDfc();
+
+	__KTRACE_OPT(KMMU, Kern::Printf("<DMemModelNonAlignedShPool::Alloc return buf = 0x%08x", aShBuf));
+	return KErrNone;
+	}