--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/memmodel/epoc/flexible/mprocess.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,1130 @@
+// 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:
+//
+
+#include <memmodel.h>
+#include "mmu/mm.h"
+#include "mmu/maddrcont.h"
+#include "mmboot.h"
+#include <kernel/cache.h>
+#include "execs.h"
+
+#define iMState		iWaitLink.iSpare1
+
+NFastMutex TheSharedChunkLock;
+
+#ifndef _DEBUG
+const TInt KChunkGranularity = 4; // amount to grow SChunkInfo list by
+const TInt KMaxChunkInfosInOneGo = 100; // max number of SChunkInfo objects to copy with System Lock held
+#else // if debug...
+const TInt KChunkGranularity = 1;
+const TInt KMaxChunkInfosInOneGo = 1;
+#endif
+
+
+
+/********************************************
+ * Process
+ ********************************************/
+
+DMemModelProcess::~DMemModelProcess()
+	{
+	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelProcess destruct"));
+	Destruct();
+	}
+
+
+void DMemModelProcess::Destruct()
+	{
+	__ASSERT_ALWAYS(!iOsAsidRefCount, MM::Panic(MM::EProcessDestructOsAsidRemaining));
+	__ASSERT_ALWAYS(!iChunkCount, MM::Panic(MM::EProcessDestructChunksRemaining));
+	Kern::Free(iChunks);
+	__ASSERT_ALWAYS(!iSharedChunks || iSharedChunks->Count()==0, MM::Panic(MM::EProcessDestructChunksRemaining));
+	delete iSharedChunks;
+
+	DProcess::Destruct();
+	}
+
+TInt DMemModelProcess::TryOpenOsAsid()
+	{
+	if (__e32_atomic_tas_ord32(&iOsAsidRefCount, 1, 1, 0))
+		{
+		return iOsAsid;
+		}
+	return KErrDied;
+	}
+
+void DMemModelProcess::CloseOsAsid()
+	{
+	if (__e32_atomic_tas_ord32(&iOsAsidRefCount, 1, -1, 0) == 1)
+		{// Last reference has been closed so free the asid.
+		MM::AddressSpaceFree(iOsAsid);
+		}
+	}
+
+void DMemModelProcess::AsyncCloseOsAsid()
+	{
+	if (__e32_atomic_tas_ord32(&iOsAsidRefCount, 1, -1, 0) == 1)
+		{// Last reference has been closed so free the asid asynchronusly.
+		MM::AsyncAddressSpaceFree(iOsAsid);
+		}
+	}
+
+TInt DMemModelProcess::NewChunk(DChunk*& aChunk, SChunkCreateInfo& aInfo, TLinAddr& aRunAddr)
+	{
+	aChunk=NULL;
+
+	DMemModelChunk* pC=new DMemModelChunk;
+	if (!pC)
+		return KErrNoMemory;
+
+	TChunkType type = aInfo.iType;
+	pC->iChunkType=type;
+	TInt r=pC->SetAttributes(aInfo);
+	if (r!=KErrNone)
+		{
+		pC->Close(NULL);
+		return r;
+		}
+
+	pC->iOwningProcess=(pC->iAttributes&DMemModelChunk::EPublic)?NULL:this;
+	r=pC->Create(aInfo);
+	if (r==KErrNone && (aInfo.iOperations & SChunkCreateInfo::EAdjust))
+		{
+		if (aInfo.iRunAddress!=0)
+			pC->SetFixedAddress(aInfo.iRunAddress,aInfo.iPreallocated);
+		if (aInfo.iPreallocated==0 && aInfo.iInitialTop!=0)
+			{
+			if (pC->iAttributes & DChunk::EDisconnected)
+				{
+				r=pC->Commit(aInfo.iInitialBottom,aInfo.iInitialTop-aInfo.iInitialBottom);
+				}
+			else if (pC->iAttributes & DChunk::EDoubleEnded)
+				{
+				r=pC->AdjustDoubleEnded(aInfo.iInitialBottom,aInfo.iInitialTop);
+				}
+			else
+				{
+				r=pC->Adjust(aInfo.iInitialTop);
+				}
+			}
+		}
+	if (r==KErrNone && (aInfo.iOperations & SChunkCreateInfo::EAdd))
+		{
+		r = AddChunk(pC, EFalse);
+		}
+	if (r==KErrNone)
+		{
+		if(pC->iKernelMapping)
+			aRunAddr = (TLinAddr)MM::MappingBase(pC->iKernelMapping);
+		pC->iDestroyedDfc = aInfo.iDestroyedDfc;
+		aChunk=(DChunk*)pC;
+		}
+	else
+		pC->Close(NULL);	// NULL since chunk can't have been added to process
+	return r;
+	}
+
+
+/**
+Determine whether this process should be data paged.
+
+@param aInfo	A reference to the create info for this process.
+ */
+TInt DMemModelProcess::SetPaging(const TProcessCreateInfo& aInfo)
+	{
+	TUint pagedFlags = aInfo.iFlags & TProcessCreateInfo::EDataPagingMask;
+	// If KImageDataPaged and KImageDataUnpaged flags present then corrupt
+	// Check this first to ensure that it is always verified.
+	if (pagedFlags == TProcessCreateInfo::EDataPagingMask)
+		{
+		return KErrCorrupt;
+		}
+
+	if (aInfo.iAttr & ECodeSegAttKernel ||
+		!(K::MemModelAttributes & EMemModelAttrDataPaging))
+		{// Kernel process shouldn't be data paged or no data paging device installed.
+		return KErrNone;
+		}
+
+	TUint dataPolicy = TheSuperPage().KernelConfigFlags() & EKernelConfigDataPagingPolicyMask;
+	if (dataPolicy == EKernelConfigDataPagingPolicyAlwaysPage)
+		{
+		iAttributes |= EDataPaged;
+		return KErrNone;
+		}
+	if (dataPolicy == EKernelConfigDataPagingPolicyNoPaging)
+		{// No paging allowed so just return.
+		return KErrNone;
+		}
+	if (pagedFlags == TProcessCreateInfo::EDataPaged)
+		{
+		iAttributes |= EDataPaged;
+		return KErrNone;
+		}
+	if (pagedFlags == TProcessCreateInfo::EDataUnpaged)
+		{// No paging set so just return.
+		return KErrNone;
+		}
+	// Neither paged nor unpaged set so use default paging policy.
+	// dataPolicy must be EKernelConfigDataPagingPolicyDefaultUnpaged or 
+	// EKernelConfigDataPagingPolicyDefaultPaged.
+	__NK_ASSERT_DEBUG(pagedFlags == TProcessCreateInfo::EDataPagingUnspecified);
+	__NK_ASSERT_DEBUG(	dataPolicy == EKernelConfigDataPagingPolicyDefaultPaged ||
+						dataPolicy == EKernelConfigDataPagingPolicyDefaultUnpaged);
+	if (dataPolicy == EKernelConfigDataPagingPolicyDefaultPaged)
+		{
+		iAttributes |= EDataPaged;
+		}
+	return KErrNone;
+	}
+
+
+TInt DMemModelProcess::DoCreate(TBool aKernelProcess, TProcessCreateInfo& aInfo)
+	{
+	// Required so we can detect whether a process has been created and added 
+	// to its object container by checking for iContainerID!=EProcess.
+	__ASSERT_COMPILE(EProcess != 0);
+	__KTRACE_OPT(KPROC,Kern::Printf(">DMemModelProcess::DoCreate %O",this));
+	TInt r=KErrNone;
+
+	if (aKernelProcess)
+		{
+		iAttributes |= ESupervisor;
+		iOsAsid = KKernelOsAsid;
+		}
+	else
+		{
+		r = MM::AddressSpaceAlloc(iPageDir);
+		if (r>=0)
+			{
+			iOsAsid = r;
+			r = KErrNone;
+			}
+		}
+	if (r == KErrNone)
+		{// Add this process's own reference to its os asid.
+		__e32_atomic_store_ord32(&iOsAsidRefCount, 1);
+		}
+
+#ifdef BTRACE_FLEXIBLE_MEM_MODEL
+	BTrace8(BTrace::EFlexibleMemModel,BTrace::EAddressSpaceId,this,iOsAsid);
+#endif
+
+	__KTRACE_OPT(KPROC,Kern::Printf("OS ASID=%d, PD=%08x",iOsAsid,iPageDir));
+	__KTRACE_OPT(KPROC,Kern::Printf("<DMemModelProcess::DoCreate %d",r));
+	return r;
+	}
+
+TInt DMemModelProcess::CreateDataBssStackArea(TProcessCreateInfo& aInfo)
+	{
+	__KTRACE_OPT(KPROC,Kern::Printf("DMemModelProcess::CreateDataBssStackArea %O",this));
+	TInt r = KErrNone;
+	TInt dataBssSize = MM::RoundToPageSize(aInfo.iTotalDataSize);
+	if(dataBssSize)
+		{
+		DMemoryObject* memory;
+		TMemoryObjectType memoryType = iAttributes&EDataPaged ? EMemoryObjectPaged : EMemoryObjectMovable;
+		r = MM::MemoryNew(memory,memoryType,MM::BytesToPages(dataBssSize));
+		if(r==KErrNone)
+			{
+			r = MM::MemoryAlloc(memory,0,MM::BytesToPages(dataBssSize));
+			if(r==KErrNone)
+				{
+				r = MM::MappingNew(iDataBssMapping,memory,EUserReadWrite,OsAsid());
+				}
+			if(r!=KErrNone)
+				MM::MemoryDestroy(memory);
+			else
+				{
+				iDataBssRunAddress = MM::MappingBase(iDataBssMapping);
+#ifdef BTRACE_FLEXIBLE_MEM_MODEL
+				BTrace8(BTrace::EFlexibleMemModel,BTrace::EMemoryObjectIsProcessStaticData,memory,this);
+#endif
+				}
+			}
+		}
+	__KTRACE_OPT(KPROC,Kern::Printf("DataBssSize=%x, ",dataBssSize));
+
+	return r;
+	}
+
+
+TInt DMemModelProcess::AttachExistingCodeSeg(TProcessCreateInfo& aInfo)
+	{
+	TInt r = DEpocProcess::AttachExistingCodeSeg(aInfo);
+	if(r==KErrNone)
+		{
+		// allocate virtual memory for the EXEs codeseg...
+		DMemModelCodeSeg* seg = (DMemModelCodeSeg*)iTempCodeSeg;
+		if(seg->iAttr&ECodeSegAttAddrNotUnique)
+			{
+			TUint codeSize = seg->iSize;
+			TLinAddr codeAddr = seg->RamInfo().iCodeRunAddr;
+			TBool isDemandPaged = seg->iAttr&ECodeSegAttCodePaged;
+			// Allocate virtual memory for the code seg using the os asid.
+			// No need to open a reference on os asid as process not fully 
+			// created yet so it can't die and free the os asid.
+			r = MM::VirtualAlloc(OsAsid(),codeAddr,codeSize,isDemandPaged);
+			if(r==KErrNone)
+				{
+				iCodeVirtualAllocSize = codeSize;
+				iCodeVirtualAllocAddress = codeAddr;
+				}
+			}
+		}
+
+	return r;
+	}
+
+
+TInt DMemModelProcess::AddChunk(DChunk* aChunk, TBool aIsReadOnly)
+	{
+	DMemModelChunk* pC=(DMemModelChunk*)aChunk;
+	if(pC->iOwningProcess && this!=pC->iOwningProcess)
+		return KErrAccessDenied;
+
+	TInt r = WaitProcessLock();
+	if(r==KErrNone)
+		{
+		TInt i = ChunkIndex(pC);
+		if(i>=0) // Found the chunk in this process, just up its count
+			{
+			iChunks[i].iAccessCount++;
+			__KTRACE_OPT(KPROC,Kern::Printf("DMemModelProcess::AddChunk %08x to %08x (Access count incremented to %d)",aChunk,this,iChunks[i].iAccessCount));
+			SignalProcessLock();
+			return KErrNone;
+			}
+		r = DoAddChunk(pC,aIsReadOnly);
+		SignalProcessLock();
+		}
+	__KTRACE_OPT(KPROC,Kern::Printf("DMemModelProcess::AddChunk returns %d",r));
+	return r;
+	}
+
+
+void M::FsRegisterThread()
+	{
+	TInternalRamDrive::Unlock();
+	}
+
+
+void ExecHandler::UnlockRamDrive()
+	{
+	}
+
+
+EXPORT_C TLinAddr TInternalRamDrive::Base()
+	{
+	DMemModelChunk* pC=(DMemModelChunk*)PP::TheRamDriveChunk;
+	DMemModelProcess* pP=(DMemModelProcess*)TheCurrentThread->iOwningProcess;
+	NKern::LockSystem();
+	TLinAddr addr = (TLinAddr)pC->Base(pP);
+	NKern::UnlockSystem();
+	if(!addr)
+		{
+		Unlock();
+		NKern::LockSystem();
+		addr = (TLinAddr)pC->Base(pP);
+		NKern::UnlockSystem();
+		}
+	return addr;
+	}
+
+
+EXPORT_C void TInternalRamDrive::Unlock()
+	{
+	DMemModelChunk* pC=(DMemModelChunk*)PP::TheRamDriveChunk;
+	DMemModelProcess* pP=(DMemModelProcess*)TheCurrentThread->iOwningProcess;
+	
+	TInt r = pP->WaitProcessLock();
+	if(r==KErrNone)
+		if(pP->ChunkIndex(pC)==KErrNotFound)
+			r = pP->DoAddChunk(pC,EFalse);
+	__ASSERT_ALWAYS(r==KErrNone, MM::Panic(MM::EFsRegisterThread));
+	pP->SignalProcessLock();
+	}
+
+
+EXPORT_C void TInternalRamDrive::Lock()
+	{
+	}
+
+
+TInt DMemModelProcess::DoAddChunk(DMemModelChunk* aChunk, TBool aIsReadOnly)
+	{
+	//
+	// Must hold the process $LOCK mutex before calling this.
+	// As the process lock is held it is safe to access iOsAsid without a reference.
+	//
+
+	__NK_ASSERT_DEBUG(ChunkIndex(aChunk)==KErrNotFound); // shouldn't be adding a chunk which is already added
+
+	__KTRACE_OPT(KPROC,Kern::Printf("DMemModelProcess::DoAddChunk %O to %O",aChunk,this));
+
+	// create mapping for chunk...
+	DMemoryMapping* mapping;
+	TMappingPermissions perm = MM::MappingPermissions
+		(
+		iOsAsid!=(TInt)KKernelOsAsid,	// user?
+		aIsReadOnly==false, // write?
+		aChunk->iAttributes&DMemModelChunk::ECode // execute?
+		);
+	TInt r;
+	if(aChunk->iFixedBase) // HACK, kernel chunk has a fixed iBase
+		r = MM::MappingNew(mapping,aChunk->iMemoryObject,perm,iOsAsid,EMappingCreateExactVirtual,(TLinAddr)aChunk->iFixedBase);
+	else
+		r = MM::MappingNew(mapping,aChunk->iMemoryObject,perm,iOsAsid);
+	if(r!=KErrNone)
+		return r;
+	if(iOsAsid==0)
+		aChunk->iKernelMapping = mapping;
+	TLinAddr base = MM::MappingBase(mapping);
+
+	// expand chunk info memory if required...
+	if(iChunkCount==iChunkAlloc)
+		{
+		TInt newAlloc = iChunkAlloc+KChunkGranularity;
+		r = Kern::SafeReAlloc((TAny*&)iChunks,iChunkAlloc*sizeof(SChunkInfo),newAlloc*sizeof(SChunkInfo));
+		if(r!=KErrNone)
+			{
+			MM::MappingDestroy(mapping);
+			return r;
+			}
+		iChunkAlloc = newAlloc;
+		}
+
+	// insert new chunk info...
+	TUint i = ChunkInsertIndex(aChunk);
+	SChunkInfo* info = iChunks+i;
+	SChunkInfo* infoEnd = iChunks+iChunkCount;
+	NKern::LockSystem();
+	++iChunkCount;
+	for(;;)
+		{
+		// make space for new chunk info by shuffling along
+		// existing infos KMaxChunkInfosInOneGo at a time...
+		SChunkInfo* infoPtr = infoEnd-KMaxChunkInfosInOneGo;
+		if(infoPtr<info)
+			infoPtr = info;
+		memmove(infoPtr+1,infoPtr,(TLinAddr)infoEnd-(TLinAddr)infoPtr);
+		infoEnd = infoPtr;
+		if(infoEnd<=info)
+			break;
+		NKern::FlashSystem();
+		}
+	info->iChunk = aChunk;
+	info->iMapping = mapping;
+	info->iAccessCount = 1;
+	info->iIsReadOnly = aIsReadOnly;
+	NKern::UnlockSystem();
+
+	// add chunk to list of Shared Chunks...
+	if(aChunk->iChunkType==ESharedKernelSingle || aChunk->iChunkType==ESharedKernelMultiple)
+		{
+		if(!iSharedChunks)
+			iSharedChunks = new RAddressedContainer(&TheSharedChunkLock,iProcessLock);
+		if(!iSharedChunks)
+			r = KErrNoMemory;
+		else
+			r = iSharedChunks->Add(base,aChunk);
+		if(r!=KErrNone)
+			{
+			DoRemoveChunk(i);
+			return r;
+			}
+		}
+
+	// done OK...
+	__DEBUG_EVENT(EEventUpdateProcess, this);
+	return KErrNone;
+	}
+
+
+void DMemModelProcess::DoRemoveChunk(TInt aIndex)
+	{
+	__DEBUG_EVENT(EEventUpdateProcess, this);
+
+	DMemModelChunk* chunk = iChunks[aIndex].iChunk;
+	DMemoryMapping* mapping = iChunks[aIndex].iMapping;
+
+	if(chunk->iChunkType==ESharedKernelSingle || chunk->iChunkType==ESharedKernelMultiple)
+		{
+		// remove chunk from list of Shared Chunks...
+		if(iSharedChunks)
+			{
+			iSharedChunks->Remove(MM::MappingBase(mapping));
+#ifdef _DEBUG
+			// delete iSharedChunks if it's empty, so memory leak test code passes...
+			if(iSharedChunks->Count()==0)
+				{
+				NKern::FMWait(&TheSharedChunkLock);
+				RAddressedContainer* s = iSharedChunks;
+				iSharedChunks = 0;
+				NKern::FMSignal(&TheSharedChunkLock);
+				delete s;
+				}
+#endif
+			}
+		}
+
+	// remove chunk from array...
+	SChunkInfo* infoStart = iChunks+aIndex+1;
+	SChunkInfo* infoEnd = iChunks+iChunkCount;
+	NKern::LockSystem();
+	for(;;)
+		{
+		// shuffle existing infos down KMaxChunkInfosInOneGo at a time...
+		SChunkInfo* infoPtr = infoStart+KMaxChunkInfosInOneGo;
+		if(infoPtr>infoEnd)
+			infoPtr = infoEnd;
+		memmove(infoStart-1,infoStart,(TLinAddr)infoPtr-(TLinAddr)infoStart);
+		infoStart = infoPtr;
+		if(infoStart>=infoEnd)
+			break;
+		NKern::FlashSystem();
+		}
+	--iChunkCount;
+	NKern::UnlockSystem();
+
+	if(mapping==chunk->iKernelMapping)
+		chunk->iKernelMapping = 0;
+
+	MM::MappingDestroy(mapping);
+	}
+
+
+/**
+Final chance for process to release resources during its death.
+
+Called with process $LOCK mutex held (if it exists).
+This mutex will not be released before it is deleted.
+I.e. no other thread will ever hold the mutex again.
+*/
+void DMemModelProcess::FinalRelease()
+	{
+	// Clean up any left over chunks (such as SharedIo buffers)
+	if(iProcessLock)
+		while(iChunkCount)
+			DoRemoveChunk(0);
+	// Destroy the remaining mappings and memory objects owned by this process
+	MM::MappingAndMemoryDestroy(iDataBssMapping);
+	if(iCodeVirtualAllocSize)
+		MM::VirtualFree(iOsAsid,iCodeVirtualAllocAddress,iCodeVirtualAllocSize);
+
+	// Close the original reference on the os asid.
+	CloseOsAsid();
+	}
+
+
+void DMemModelProcess::RemoveChunk(DMemModelChunk *aChunk)
+	{
+	// note that this can't be called after the process $LOCK mutex has been deleted
+	// since it can only be called by a thread in this process doing a handle close or
+	// dying, or by the process handles array being deleted due to the process dying,
+	// all of which happen before $LOCK is deleted.
+	__KTRACE_OPT(KPROC,Kern::Printf("DMemModelProcess %O RemoveChunk %O",this,aChunk));
+	Kern::MutexWait(*iProcessLock);
+	TInt i = ChunkIndex(aChunk);
+	if(i>=0) // Found the chunk
+		{
+		__KTRACE_OPT(KPROC,Kern::Printf("Chunk access count %d",iChunks[i].iAccessCount));
+		if(--iChunks[i].iAccessCount==0)
+			{
+			DoRemoveChunk(i);
+			}
+		}
+	Kern::MutexSignal(*iProcessLock);
+	}
+
+
+TUint8* DMemModelChunk::Base(DProcess* aProcess)
+	{
+	DMemModelProcess* pP = (DMemModelProcess*)aProcess;
+	DMemoryMapping* mapping = 0;
+
+	if(iKernelMapping && pP==K::TheKernelProcess)
+		{
+		// shortcut for shared chunks...
+		mapping = iKernelMapping;
+		}
+	else
+		{
+		// find chunk in process...
+		TInt i = pP->ChunkIndex(this);
+		if(i>=0)
+			mapping = pP->iChunks[i].iMapping;
+		}
+
+	if(!mapping)
+		return 0;
+
+	return (TUint8*)MM::MappingBase(mapping);
+	}
+
+
+DChunk* DThread::OpenSharedChunk(const TAny* aAddress, TBool aWrite, TInt& aOffset)
+	{
+	DMemModelChunk* chunk = 0;
+
+	NKern::FMWait(&TheSharedChunkLock);
+	RAddressedContainer* list = ((DMemModelProcess*)iOwningProcess)->iSharedChunks;
+	if(list)
+		{
+		// search list...
+		TUint offset;
+		chunk = (DMemModelChunk*)list->Find((TLinAddr)aAddress,offset);
+		if(chunk && offset<TUint(chunk->iMaxSize) && chunk->Open()==KErrNone)
+			aOffset = offset; // chunk found and opened successfully
+		else
+			chunk = 0; // failed
+		}
+	NKern::FMSignal(&TheSharedChunkLock);
+
+	return chunk;
+	}
+
+
+TUint DMemModelProcess::ChunkInsertIndex(DMemModelChunk* aChunk)
+	{
+	// need to hold iProcessLock or System Lock...
+#ifdef _DEBUG
+	if(K::Initialising==false && iProcessLock!=NULL && iProcessLock->iCleanup.iThread!=&Kern::CurrentThread())
+		{
+		// don't hold iProcessLock, so...
+		__ASSERT_SYSTEM_LOCK;
+		}
+#endif
+
+	// binary search...
+	SChunkInfo* list = iChunks;
+	TUint l = 0;
+	TUint r = iChunkCount;
+	TUint m;
+	while(l<r)
+		{
+		m = (l+r)>>1;
+		DChunk* x = list[m].iChunk;
+		if(x<=aChunk)
+			l = m+1;
+		else
+			r = m;
+		}
+	return r;
+	}
+
+
+TInt DMemModelProcess::ChunkIndex(DMemModelChunk* aChunk)
+	{
+	TUint i = ChunkInsertIndex(aChunk);
+	if(i && iChunks[--i].iChunk==aChunk)
+		return i;
+	return KErrNotFound;
+	}
+
+
+TInt DMemModelProcess::MapCodeSeg(DCodeSeg* aSeg)
+	{
+	__ASSERT_CRITICAL;	// Must be in critical section so can't leak os asid references.
+		
+	DMemModelCodeSeg& seg=*(DMemModelCodeSeg*)aSeg;
+	__KTRACE_OPT(KDLL,Kern::Printf("Process %O MapCodeSeg %C", this, aSeg));
+	TBool kernel_only=( (seg.iAttr&(ECodeSegAttKernel|ECodeSegAttGlobal)) == ECodeSegAttKernel );
+	TBool user_local=( (seg.iAttr&(ECodeSegAttKernel|ECodeSegAttGlobal)) == 0 );
+	if (kernel_only && !(iAttributes&ESupervisor))
+		return KErrNotSupported;
+	if (seg.iAttr&ECodeSegAttKernel)
+		return KErrNone;	// no extra mappings needed for kernel code
+
+	// Attempt to open a reference on the os asid it is required so
+	// MapUserRamCode() and CommitDllData() can use iOsAsid safely.
+	TInt osAsid = TryOpenOsAsid();
+	if (osAsid < 0)
+		{// The process has died.
+		return KErrDied;
+		}
+
+	TInt r=KErrNone;
+	if (user_local)
+		r=MapUserRamCode(seg.Memory());
+	if (seg.IsDll())
+		{
+		TInt total_data_size;
+		TLinAddr data_base;
+		seg.GetDataSizeAndBase(total_data_size, data_base);
+		if (r==KErrNone && total_data_size)
+			{
+			TInt size=MM::RoundToPageSize(total_data_size);
+			r=CommitDllData(data_base, size, aSeg);
+			if (r!=KErrNone && user_local)
+				UnmapUserRamCode(seg.Memory());
+			}
+		}
+	CloseOsAsid();
+
+	return r;
+	}
+
+
+void DMemModelProcess::UnmapCodeSeg(DCodeSeg* aSeg)
+	{
+	__ASSERT_CRITICAL;	// Must be in critical section so can't leak os asid references.
+
+	DMemModelCodeSeg& seg=*(DMemModelCodeSeg*)aSeg;
+	__KTRACE_OPT(KDLL,Kern::Printf("Process %O UnmapCodeSeg %C", this, aSeg));
+	if (seg.iAttr&ECodeSegAttKernel)
+		return;	// no extra mappings needed for kernel code
+
+	// Attempt to open a reference on the os asid it is required so
+	// UnmapUserRamCode() and DecommitDllData() can use iOsAsid safely.
+	TInt osAsid = TryOpenOsAsid();
+	if (osAsid < 0)
+		{// The process has died and it the process it will have cleaned up any code segs.
+		return;
+		}
+
+	if (seg.IsDll())
+		{
+		TInt total_data_size;
+		TLinAddr data_base;
+		seg.GetDataSizeAndBase(total_data_size, data_base);
+		if (total_data_size)
+			DecommitDllData(data_base, MM::RoundToPageSize(total_data_size));
+		}
+	if (seg.Memory())
+		UnmapUserRamCode(seg.Memory());
+
+	CloseOsAsid();
+	}
+
+void DMemModelProcess::RemoveDllData()
+//
+// Call with CodeSegLock held
+//
+	{
+	}
+
+
+TInt DMemModelProcess::MapUserRamCode(DMemModelCodeSegMemory* aMemory)
+	{
+	__KTRACE_OPT(KPROC,Kern::Printf("DMemModelProcess %O MapUserRamCode %C %d %d",
+									this, aMemory->iCodeSeg, iOsAsid, aMemory->iPagedCodeInfo!=0));
+	__ASSERT_MUTEX(DCodeSeg::CodeSegLock);
+
+	TMappingCreateFlags createFlags = EMappingCreateExactVirtual;
+
+	if(!(aMemory->iCodeSeg->iAttr&ECodeSegAttAddrNotUnique))
+		{
+		// codeseg memory address is globally unique, (common address across all processes)...
+		FlagSet(createFlags,EMappingCreateCommonVirtual);
+		}
+
+	if(aMemory->iCodeSeg->IsExe())
+		{
+		// EXE codesegs have already had their virtual address allocated so we must adopt that...
+		__NK_ASSERT_DEBUG(iCodeVirtualAllocSize);
+		__NK_ASSERT_DEBUG(iCodeVirtualAllocAddress==aMemory->iRamInfo.iCodeRunAddr);
+		iCodeVirtualAllocSize = 0;
+		iCodeVirtualAllocAddress = 0;
+		FlagSet(createFlags,EMappingCreateAdoptVirtual);
+		}
+
+	DMemoryMapping* mapping;
+	return MM::MappingNew(mapping,aMemory->iCodeMemoryObject,EUserExecute,iOsAsid,createFlags,aMemory->iRamInfo.iCodeRunAddr);
+	}
+
+
+void DMemModelProcess::UnmapUserRamCode(DMemModelCodeSegMemory* aMemory)
+	{
+	__KTRACE_OPT(KPROC,Kern::Printf("DMemModelProcess %O UnmapUserRamCode %C %d %d",
+									this, aMemory->iCodeSeg, iOsAsid, aMemory->iPagedCodeInfo!=0));
+
+	__ASSERT_MUTEX(DCodeSeg::CodeSegLock);
+	MM::MappingDestroy(aMemory->iRamInfo.iCodeRunAddr,iOsAsid);
+	}
+
+
+TInt DMemModelProcess::CommitDllData(TLinAddr aBase, TInt aSize, DCodeSeg* aCodeSeg)
+	{
+	__KTRACE_OPT(KDLL,Kern::Printf("DMemModelProcess %O CommitDllData %08x+%x",this,aBase,aSize));
+
+	DMemoryObject* memory;
+	TMemoryObjectType memoryType = aCodeSeg->iAttr&ECodeSegAttDataPaged ? EMemoryObjectPaged : EMemoryObjectMovable;
+	TInt r = MM::MemoryNew(memory,memoryType,MM::BytesToPages(aSize));
+	if(r==KErrNone)
+		{
+		r = MM::MemoryAlloc(memory,0,MM::BytesToPages(aSize));
+		if(r==KErrNone)
+			{
+			DMemoryMapping* mapping;
+			r = MM::MappingNew(mapping,memory,EUserReadWrite,iOsAsid,EMappingCreateCommonVirtual,aBase);
+			}
+		if(r!=KErrNone)
+			MM::MemoryDestroy(memory);
+		else
+			{
+#ifdef BTRACE_FLEXIBLE_MEM_MODEL
+			BTrace12(BTrace::EFlexibleMemModel,BTrace::EMemoryObjectIsDllStaticData,memory,aCodeSeg,this);
+#endif
+			}
+		
+		}
+	__KTRACE_OPT(KDLL,Kern::Printf("CommitDllData returns %d",r));
+	return r;
+	}
+
+
+void DMemModelProcess::DecommitDllData(TLinAddr aBase, TInt aSize)
+	{
+	__KTRACE_OPT(KDLL,Kern::Printf("DMemModelProcess %O DecommitDllData %08x+%x",this,aBase,aSize));
+	MM::MappingAndMemoryDestroy(aBase,iOsAsid);
+	}
+
+void DMemModelProcess::BTracePrime(TInt aCategory)
+	{
+	DProcess::BTracePrime(aCategory);
+
+#ifdef BTRACE_FLEXIBLE_MEM_MODEL
+	if (aCategory == BTrace::EFlexibleMemModel || aCategory == -1)
+		{
+		BTrace8(BTrace::EFlexibleMemModel,BTrace::EAddressSpaceId,this,iOsAsid);
+
+		if (iDataBssMapping)
+			{
+			DMemoryObject* memory = MM::MappingGetAndOpenMemory(iDataBssMapping);
+			if (memory)
+				{
+				MM::MemoryBTracePrime(memory);
+				BTrace8(BTrace::EFlexibleMemModel,BTrace::EMemoryObjectIsProcessStaticData,memory,this);
+				MM::MemoryClose(memory);
+				}
+			}
+		
+		// Trace memory objects for DLL static data
+		SDblQue cs_list;
+		DCodeSeg::UnmarkAll(DCodeSeg::EMarkListDeps|DCodeSeg::EMarkUnListDeps);
+		TraverseCodeSegs(&cs_list, NULL, DCodeSeg::EMarkListDeps, 0);
+		SDblQueLink* anchor=&cs_list.iA;
+		SDblQueLink* pL=cs_list.First();
+		for(; pL!=anchor; pL=pL->iNext)
+			{
+			DMemModelCodeSeg* seg = _LOFF(pL,DMemModelCodeSeg,iTempLink);
+			if (seg->IsDll())
+				{
+				TInt total_data_size;
+				TLinAddr data_base;
+				seg->GetDataSizeAndBase(total_data_size, data_base);
+				if (total_data_size)
+					{
+					TUint offset;
+					// The instance count can be ignored as a dll data mapping is only ever 
+					// used with a single memory object.
+					TUint mappingInstanceCount;
+					NKern::ThreadEnterCS();
+					DMemoryMapping* mapping = MM::FindMappingInAddressSpace(iOsAsid, data_base, 0, offset, mappingInstanceCount);
+					if (mapping)
+						{
+						DMemoryObject* memory = MM::MappingGetAndOpenMemory(mapping);
+						if (memory)
+							{
+							MM::MemoryBTracePrime(memory);
+							BTrace12(BTrace::EFlexibleMemModel,BTrace::EMemoryObjectIsDllStaticData,memory,seg,this);
+							MM::MemoryClose(memory);
+							}
+						MM::MappingClose(mapping);
+						}
+					NKern::ThreadLeaveCS();
+					}
+				}
+			}
+		DCodeSeg::EmptyQueue(cs_list, 0);	// leave cs_list empty
+		}
+#endif
+	}
+
+
+TInt DMemModelProcess::NewShPool(DShPool*& aPool, TShPoolCreateInfo& aInfo)
+	{
+	aPool = NULL;
+	DMemModelShPool* pC = NULL;
+
+	if (aInfo.iInfo.iFlags & TShPoolCreateInfo::EPageAlignedBuffer)
+		{
+		pC = new DMemModelAlignedShPool();
+		}
+	else
+		{
+		pC = new DMemModelNonAlignedShPool();
+		}
+
+	if (pC == NULL)
+		{
+		return KErrNoMemory;
+		}
+
+	TInt r = pC->Create(this, aInfo);
+
+	if (r == KErrNone)
+		{
+		aPool = pC;
+		}
+	else
+		{
+		pC->Close(NULL);
+		}
+
+	return r;
+	}
+
+
+TInt DThread::RawRead(const TAny* aSrc, TAny* aDest, TInt aLength, TInt aFlags, TIpcExcTrap* aExcTrap)
+//
+// Read from the thread's process.
+// aSrc      Run address of memory to read
+// aDest     Current address of destination
+// aExcTrap  Exception trap object to be updated if the actual memory access is performed on other memory area than specified.
+//           It happens when  reading is performed on un-aligned memory area.
+//
+	{
+	(void)aExcTrap;
+	DMemModelThread& t=*(DMemModelThread*)TheCurrentThread;
+	DMemModelProcess* pP=(DMemModelProcess*)iOwningProcess;
+	TLinAddr src=(TLinAddr)aSrc;
+	TLinAddr dest=(TLinAddr)aDest;
+	TInt result = KErrNone;
+	TBool have_taken_fault = EFalse;
+
+	while (aLength)
+		{
+		if (iMState==EDead)
+			{
+			result = KErrDied;
+			break;
+			}
+		TLinAddr alias_src;
+		TUint alias_size;
+		
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		TInt pagingTrap;
+		XTRAP_PAGING_START(pagingTrap);		
+#endif
+
+		TInt len = have_taken_fault ? Min(aLength, KPageSize - (src & KPageMask)) : aLength;
+		TInt alias_result=t.Alias(src, pP, len, alias_src, alias_size);
+		if (alias_result<0)
+			{
+			result = KErrBadDescriptor;	// bad permissions
+			break;
+			}
+		
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		// need to let the trap handler know where we are accessing in case we take a page fault
+		// and the alias gets removed
+		aExcTrap->iRemoteBase = alias_src;
+		aExcTrap->iSize = alias_size;
+#endif
+			
+		__KTRACE_OPT(KTHREAD2,Kern::Printf("DThread::RawRead %08x<-%08x+%x",dest,alias_src,alias_size));
+
+		CHECK_PAGING_SAFE;
+
+		if(aFlags&KCheckLocalAddress)
+			MM::ValidateLocalIpcAddress(dest,alias_size,ETrue);
+		memcpy( (TAny*)dest, (const TAny*)alias_src, alias_size);
+
+		src+=alias_size;
+		dest+=alias_size;
+		aLength-=alias_size;
+
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		XTRAP_PAGING_END;
+		if(pagingTrap)
+			have_taken_fault = ETrue;
+#endif
+		}
+	t.RemoveAlias();
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+	t.iPagingExcTrap = NULL;  // in case we broke out of the loop and skipped XTRAP_PAGING_END
+#endif
+
+	return result;
+	}
+
+
+TInt DThread::RawWrite(const TAny* aDest, const TAny* aSrc, TInt aLength, TInt aFlags, DThread* /*anOriginatingThread*/, TIpcExcTrap* aExcTrap)
+//
+// Write to the thread's process.
+// aDest               Run address of memory to write
+// aSrc                Current address of destination
+// aExcTrap            Exception trap object to be updated if the actual memory access is performed on other memory area then specified.
+//                     It happens when reading is performed on un-aligned memory area.
+//
+	{
+	(void)aExcTrap;
+	DMemModelThread& t=*(DMemModelThread*)TheCurrentThread;
+	DMemModelProcess* pP=(DMemModelProcess*)iOwningProcess;
+	TLinAddr src=(TLinAddr)aSrc;
+	TLinAddr dest=(TLinAddr)aDest;
+	TInt result = KErrNone;
+	TBool have_taken_fault = EFalse;
+
+	while (aLength)
+		{
+		if (iMState==EDead)
+			{
+			result = KErrDied;
+			break;
+			}
+		TLinAddr alias_dest;
+		TUint alias_size;
+
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		TInt pagingTrap;
+		XTRAP_PAGING_START(pagingTrap);		
+#endif
+		
+		TInt len = have_taken_fault ? Min(aLength, KPageSize - (dest & KPageMask)) : aLength;
+		TInt alias_result=t.Alias(dest, pP, len, alias_dest, alias_size);
+		if (alias_result<0)
+			{
+			result = KErrBadDescriptor;	// bad permissions
+			break;
+			}
+
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		// need to let the trap handler know where we are accessing in case we take a page fault
+		// and the alias gets removed
+		aExcTrap->iRemoteBase = alias_dest;
+		aExcTrap->iSize = alias_size;
+#endif
+
+		__KTRACE_OPT(KTHREAD2,Kern::Printf("DThread::RawWrite %08x+%x->%08x",src,alias_size,alias_dest));
+
+		// Must check that it is safe to page, unless we are reading from unpaged ROM in which case
+		// we allow it.
+		CHECK_PAGING_SAFE_RANGE(src, aLength);
+		CHECK_DATA_PAGING_SAFE_RANGE(dest, aLength);
+
+		if(aFlags&KCheckLocalAddress)
+			MM::ValidateLocalIpcAddress(src,alias_size,EFalse);
+		memcpy( (TAny*)alias_dest, (const TAny*)src, alias_size);
+
+		src+=alias_size;
+		dest+=alias_size;
+		aLength-=alias_size;
+
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		XTRAP_PAGING_END;
+		if(pagingTrap)
+			have_taken_fault = ETrue;
+#endif
+ 		}
+	t.RemoveAlias();
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+	t.iPagingExcTrap = NULL;  // in case we broke out of the loop and skipped XTRAP_PAGING_END
+#endif
+
+	return result;
+	}
+
+
+#ifndef __MARM__
+
+TInt DThread::ReadAndParseDesHeader(const TAny* aSrc, TDesHeader& aDest)
+//
+// Read the header of a remote descriptor.
+//
+	{
+	static const TUint8 LengthLookup[16]={4,8,12,8,12,0,0,0,0,0,0,0,0,0,0,0};
+
+	CHECK_PAGING_SAFE;
+	
+	DMemModelThread& t=*(DMemModelThread*)TheCurrentThread;
+	DMemModelProcess* pP=(DMemModelProcess*)iOwningProcess;
+	TLinAddr src=(TLinAddr)aSrc;
+
+	__NK_ASSERT_DEBUG(t.iIpcClient==NULL);
+	t.iIpcClient = this;
+	
+	TLinAddr pAlias;
+	TUint8* pDest = (TUint8*)&aDest;
+	TUint alias_size = 0;
+	TInt length = 12;
+	TInt type = KErrBadDescriptor;
+	while (length > 0)
+		{
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		TInt pagingTrap;
+		XTRAP_PAGING_START(pagingTrap);		
+#endif
+		
+		if (alias_size == 0)  
+			{
+			// no alias present, so must create one here
+			if (t.Alias(src, pP, length, pAlias, alias_size) != KErrNone)
+				break;
+			__NK_ASSERT_DEBUG(alias_size >= sizeof(TUint32));
+			}
+
+		// read either the first word, or as much as aliased of the remainder
+		TInt l = length == 12 ? sizeof(TUint32) : Min(length, alias_size);
+		if (Kern::SafeRead((TAny*)pAlias, (TAny*)pDest, l))
+			break;  // exception reading from user space
+		
+		if (length == 12)  
+			{
+			// we have just read the first word, so decode the descriptor type
+			type = *(TUint32*)pDest >> KShiftDesType8;
+			length = LengthLookup[type];
+			// invalid descriptor type will have length 0 which will get decrease by 'l' and
+			// terminate the loop with length < 0
+			}
+
+		src += l;
+		alias_size -= l;
+		pAlias += l;
+		pDest += l;
+		length -= l;
+		
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+		XTRAP_PAGING_END;
+		if (pagingTrap)
+			alias_size = 0;  // a page fault caused the alias to be removed
+#endif
+		}
+	
+	t.RemoveAlias();
+	t.iIpcClient = NULL;
+#ifdef __BROADCAST_CACHE_MAINTENANCE__
+	t.iPagingExcTrap = NULL;  // in case we broke out of the loop and skipped XTRAP_PAGING_END
+#endif
+	return length == 0 ? K::ParseDesHeader(aSrc, (TRawDesHeader&)aDest, aDest) : KErrBadDescriptor;
+	}
+
+
+#endif
+
+
+TInt DThread::PrepareMemoryForDMA(const TAny* aLinAddr, TInt aSize, TPhysAddr* aPhysicalPageList)
+	{
+	// not supported, new Physical Pinning APIs should be used for DMA
+	return KErrNotSupported;
+	}
+
+TInt DThread::ReleaseMemoryFromDMA(const TAny* aLinAddr, TInt aSize, TPhysAddr* aPhysicalPageList)
+	{
+	// not supported, new Physical Pinning APIs should be used for DMA
+	return KErrNotSupported;
+	}
+