--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/memmodel/epoc/multiple/arm/xkernel.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,213 @@
+// 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\multiple\arm\xkernel.cpp
+// 
+//
+
+#include "arm_mem.h"
+
+
+/********************************************
+ * Thread
+ ********************************************/
+
+TInt DArmPlatThread::SetupContext(SThreadCreateInfo& aInfo)
+	{
+	switch(iThreadType)
+		{
+		case EThreadSupervisor:
+		case EThreadMinimalSupervisor:
+		case EThreadInitial:
+		case EThreadAPInitial:
+			break;
+		case EThreadUser:
+#ifndef __SMP__
+			iNThread.iSpare3 /*iUserContextType*/ = NThread::EContextUndefined;
+#endif
+			break;
+		}
+	iNThread.SetAddressSpace(iOwningProcess);
+	iNThread.SetAttributes(KThreadAttAddressSpace);
+	iAliasPdePtr = &PageDirectory(((DMemModelProcess*)iOwningProcess)->iOsAsid)[KIPCAlias>>KChunkShift];
+	return KErrNone;
+	}
+
+/********************************************
+ * Process
+ ********************************************/
+
+DArmPlatProcess::DArmPlatProcess()
+	{
+	iAddressCheckMaskR=0x000fffffu;	// addresses<0xA0000000 OK
+	iAddressCheckMaskW=0x0000ffffu;	// addresses<0x80000000 OK
+	}
+
+void FlushTLBs();
+DArmPlatProcess::~DArmPlatProcess()
+	{
+	__KTRACE_OPT(KMMU,Kern::Printf("DArmPlatProcess destruct"));
+	FlushTLBs();
+	DMemModelProcess::Destruct();
+	}
+
+TInt DArmPlatProcess::GetNewChunk(DMemModelChunk*& aChunk, SChunkCreateInfo& aInfo)
+	{
+	aChunk=NULL;
+	DArmPlatChunk* pC=new DArmPlatChunk;
+	if (!pC)
+		return KErrNoMemory;
+	aChunk=pC;
+	TChunkType type = aInfo.iType;
+	pC->iChunkType=type;
+	TInt r=pC->SetAttributes(aInfo);
+	if(r==KErrNone)
+		{
+		if(type==ESharedKernelSingle || type==ESharedKernelMultiple || type==ESharedIo)
+			{
+			DArmPlatChunk* pM=new DArmPlatChunk;
+			if (!pM)
+				return KErrNoMemory;
+			pC->iKernelMirror = pM;
+			pM->iChunkType = ESharedKernelMirror;
+			r=pM->SetAttributes(aInfo);
+			}
+		}
+	return r;
+	}
+
+TInt DArmPlatChunk::SetAttributes(SChunkCreateInfo& aInfo)
+	{
+	switch(iChunkType)
+		{
+		case EKernelData:
+			iAttributes = EAddressFixed|EMapTypeGlobal|EPrivate;
+			break;
+		case ERamDrive:
+			iAttributes = EAddressFixed|EMapTypeGlobal|EPrivate;
+			break;
+		case EKernelStack:
+			iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate;
+			break;
+		case EKernelCode:
+			iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate|ECode;
+			break;
+		case EDll:
+		case EUserCode:
+			if (aInfo.iGlobal)
+				iAttributes = EAddressUserGlobal|EMapTypeGlobal|ECode;
+			else
+				iAttributes = EAddressFixed|EMapTypeLocal|EPrivate|ECode;
+			break;
+		case EUserData:
+			if (aInfo.iGlobal)
+				iAttributes = EAddressShared|EMapTypeShared;
+			else
+				iAttributes = EAddressLocal|EMapTypeLocal|EPrivate;
+			break;
+		case EDllData:
+			iAttributes = EAddressFixed|EMapTypeLocal|EPrivate;
+			break;
+		case EUserSelfModCode:
+			if (aInfo.iGlobal)
+				iAttributes = EAddressShared|EMapTypeShared|ECode;
+			else
+				iAttributes = EAddressLocal|EMapTypeLocal|EPrivate|ECode;
+			break;
+		case ESharedKernelSingle:
+		case ESharedKernelMultiple:
+		case ESharedIo:
+			iAttributes = EAddressShared|EMapTypeShared;
+			break;
+		case ESharedKernelMirror:
+			iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate;
+			break;
+		case EKernelMessage:
+			iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate;
+			break;
+		default:
+			FAULT();
+		}
+	return KErrNone;
+	}
+
+/********************************************
+ * Chunk
+ ********************************************/
+
+DArmPlatChunk::DArmPlatChunk()
+	{}
+
+DArmPlatChunk::~DArmPlatChunk()
+	{
+	DMemModelChunk::Destruct();
+	}
+
+TInt DArmPlatChunk::SetupPermissions()
+	{
+	Mmu& m=Mmu::Get();
+	if(iChunkType==ESharedKernelSingle || iChunkType==ESharedKernelMultiple || iChunkType==ESharedIo || iChunkType==ESharedKernelMirror)
+		{
+		// override map attributes for shared kernel chunks
+		TUint ma = (iMapAttr &~ EMapAttrAccessMask) | (iChunkType==ESharedKernelMirror?EMapAttrSupRw:EMapAttrUserRw);
+		TInt r = m.PdePtePermissions(ma, iPdePermissions, iPtePermissions);
+		if (r != KErrNone)
+			return r;
+		iMapAttr = ma;
+		}
+	else
+		{
+		iPtePermissions=m.PtePermissions(iChunkType);
+		iPdePermissions=m.PdePermissions(iChunkType,EFalse);
+		}
+
+	__KTRACE_OPT(KMMU,Kern::Printf("Chunk permissions PTE=%08x PDE=%08x",iPtePermissions,iPdePermissions));
+	return KErrNone;
+	}
+
+TIpcExcTrap::TExcLocation TIpcExcTrap::ExcLocation(DThread* aThread, TAny* aContext)
+	{
+	TArmExcInfo& info=*(TArmExcInfo*)aContext;
+	if (info.iExcCode==EArmExceptionDataAbort)
+		{
+		TLinAddr va=(TLinAddr)info.iFaultAddress;
+
+		TLinAddr aliasAddr = ((DMemModelThread*)aThread)->iAliasLinAddr;
+		TBool remoteError;
+		if(aliasAddr)
+			remoteError = TUint(va^aliasAddr)<TUint(KPageSize);
+		else
+			// The second clause in the statement below was "va < iRemoteBase + iSize".
+			// iRemoteBase + iSize might conceivably wrap round.
+			// The usual fix for this is to change
+			//			va >= base && va < base + size
+			// to		va >= base && (va - base) < size
+			// but this requires the first clause (va >= base) so that va-base doesn't wrap negative.
+			// Since the first clause in this expression is va >= (iRemoteBase & ~3)
+			// we have to re-write the expression as follows:
+			// Let base' = iRemoteBase & ~3
+			// so  base  = base' + (base & 3)
+			// then we have va >= base' && va < base' + (base & 3) + iSize
+			// (effectively the & ~3 on the first clause extends the range downwards by base & 3)
+			remoteError = va>=(iRemoteBase&~3) &&
+							(va - (iRemoteBase & ~3)) < iSize + (iRemoteBase & 3);
+		if (remoteError)
+			return EExcRemote;
+
+		// Third clause was va < iLocalBase + iSize, fixed as in the "remoteError =" line above
+		if (iLocalBase && va>=(iLocalBase&~3) &&
+			(va - (iLocalBase & ~3)) < iSize + (iLocalBase & 3))
+			return EExcLocal;
+		}
+	return EExcUnknown;
+	}