sl@0: // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "mlargemappings.h"
sl@0: #include "cache_maintenance.inl"
sl@0: 
sl@0: 
sl@0: //
sl@0: // DLargeMappedMemory
sl@0: //
sl@0: 
sl@0: 
sl@0: DLargeMappedMemory::DLargeMappedMemory(DMemoryManager* aManager, TUint aSizeInPages, TMemoryAttributes aAttributes, TMemoryCreateFlags aCreateFlags)
sl@0: 	: DCoarseMemory(aManager, aSizeInPages, aAttributes, aCreateFlags)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: 
sl@0: DLargeMappedMemory* DLargeMappedMemory::New(DMemoryManager* aManager, TUint aSizeInPages, TMemoryAttributes aAttributes, TMemoryCreateFlags aCreateFlags)
sl@0: 	{
sl@0: 	TRACE(("DLargeMappedMemory::New()"));
sl@0: 	TUint chunkCount = (aSizeInPages + KPagesInPDE - 1) >> KPagesInPDEShift;
sl@0: 	TUint wordCount = (chunkCount  + 31) >> 5;
sl@0: 	TUint size = sizeof(DLargeMappedMemory) + sizeof(TUint) * (wordCount - 1);
sl@0: 	DLargeMappedMemory* self = (DLargeMappedMemory*)Kern::AllocZ(size);
sl@0: 	if(self)
sl@0: 		{
sl@0: 		new (self) DLargeMappedMemory(aManager, aSizeInPages, aAttributes, aCreateFlags);
sl@0: 		if(self->Construct()!=KErrNone)
sl@0: 			{
sl@0: 			self->Close();
sl@0: 			self = NULL;
sl@0: 			}
sl@0: 		}
sl@0: 	TRACE(("DLargeMappedMemory::New() returns 0x%08x", self));
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: DLargeMappedMemory::~DLargeMappedMemory()
sl@0: 	{
sl@0: 	TRACE2(("DLargeMappedMemory[0x%08x]::~DLargeMappedMemory()",this));
sl@0: 	}
sl@0: 
sl@0: 
sl@0: DMemoryMapping* DLargeMappedMemory::CreateMapping(TUint aIndex, TUint aCount)
sl@0: 	{
sl@0: 	TRACE(("DLargeMappedMemory[0x%08x]::CreateMapping()",this));	
sl@0: 	if (((aIndex|aCount)&(KChunkMask>>KPageShift))==0)
sl@0: 		return new DLargeMapping();
sl@0: 	else
sl@0: 		return new DFineMapping();
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TInt DLargeMappedMemory::ClaimInitialPages(TLinAddr aBase,
sl@0: 										   TUint aSize,
sl@0: 										   TMappingPermissions aPermissions,
sl@0: 										   TBool aAllowGaps,
sl@0: 										   TBool aAllowNonRamPages)
sl@0: 	{
sl@0: 	TRACE(("DLargeMappedMemory[0x%08x]::ClaimInitialPages(0x%08x,0x%08x,0x%08x,%d,%d)",
sl@0: 		   this,aBase,aSize,aPermissions,aAllowGaps,aAllowNonRamPages));
sl@0: 	TInt r = DCoarseMemory::ClaimInitialPages(aBase,aSize,aPermissions,aAllowGaps,
sl@0: 											  aAllowNonRamPages);
sl@0: 	if (r != KErrNone)
sl@0: 		return r;
sl@0: 
sl@0: 	// set initial contiguous state by checking which pages were section mapped by the bootstrap
sl@0: 	MmuLock::Lock();
sl@0: 	TPde* pPde = Mmu::PageDirectoryEntry(KKernelOsAsid,aBase);	
sl@0: 	TUint endChunk = aSize >> KChunkShift;
sl@0: 	for (TUint chunk = 0 ; chunk < endChunk ; ++chunk)
sl@0: 		{	  
sl@0: 		SetChunkContiguous(chunk, Mmu::PdeMapsSection(*pPde++));
sl@0: 		TRACE(("  chunk %d contiguous state is %d", chunk, IsChunkContiguous(chunk)));
sl@0: 		}
sl@0: 	MmuLock::Unlock();
sl@0: 	
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TInt DLargeMappedMemory::MapPages(RPageArray::TIter aPages)
sl@0: 	{
sl@0: 	TRACE2(("DLargeMappedMemory[0x%08x]::MapPages(?) index=0x%x count=0x%x",this,aPages.Index(),aPages.Count()));
sl@0: 
sl@0: 	// for now: assert pages do not overlapped a contiguous area
sl@0: 	// todo: update contiguous state, update page tables and call MapPages on large mappings
sl@0: #ifdef _DEBUG
sl@0: 	for (TUint index = aPages.Index() ; index < aPages.IndexEnd() ; index += KPagesInPDE)
sl@0: 		{
sl@0: 		MmuLock::Lock();
sl@0: 		__NK_ASSERT_DEBUG(!IsChunkContiguous(index >> KPagesInPDEShift));
sl@0: 		MmuLock::Unlock();
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	// map pages in all page tables and fine mappings
sl@0: 	return DCoarseMemory::MapPages(aPages);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void DLargeMappedMemory::RemapPage(TPhysAddr& aPageArray, TUint aIndex, TBool aInvalidateTLB)
sl@0: 	{
sl@0: 	TRACE2(("DLargeMappedMemory[0x%08x]::RemapPage() index=0x%x",this, aIndex));
sl@0: 
sl@0: 	// update contiguous state...
sl@0: 	// todo: for now we will assume that remapping a page makes it non-contiguous
sl@0: 	MmuLock::Lock();
sl@0: 	SetChunkContiguous(aIndex >> KPagesInPDEShift, EFalse);
sl@0: 	MmuLock::Unlock();
sl@0: 
sl@0: 	// remap pages in all page tables and call RemapPage on large mappings...
sl@0: 	MmuLock::Lock();
sl@0: 	TUint pteType = 0;
sl@0: 	do
sl@0: 		{
sl@0: 		DPageTables* tables = iPageTables[pteType];
sl@0: 		if(tables)
sl@0: 			{
sl@0: 			tables->Open();
sl@0: 			MmuLock::Unlock();
sl@0: 			tables->RemapPage(aPageArray, aIndex, aInvalidateTLB);
sl@0: 			tables->iMappings.RemapPage(aPageArray, aIndex, aInvalidateTLB);
sl@0: 			tables->AsyncClose();
sl@0: 			MmuLock::Lock();
sl@0: 			}
sl@0: 		}
sl@0: 	while(++pteType<ENumPteTypes);
sl@0: 	MmuLock::Unlock();
sl@0: 
sl@0: 	// remap page in all fine mappings...
sl@0: 	DMemoryObject::RemapPage(aPageArray, aIndex, aInvalidateTLB);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void DLargeMappedMemory::UnmapPages(RPageArray::TIter aPages, TBool aDecommitting)
sl@0: 	{
sl@0: 	TRACE2(("DLargeMappedMemory[0x%08x]::UnmapPages(?,%d) index=0x%x count=0x%x",this,(bool)aDecommitting,aPages.Index(),aPages.Count()));
sl@0: 
sl@0: 	// for now: assert pages do not overlapped a contiguous area
sl@0: 	// todo: update contiguous state, update page tables and call UnmapPages on large mappings
sl@0: #ifdef _DEBUG
sl@0: 	for (TUint index = aPages.Index() ; index < aPages.IndexEnd() ; index += KPagesInPDE)
sl@0: 		{
sl@0: 		MmuLock::Lock();
sl@0: 		__NK_ASSERT_DEBUG(!IsChunkContiguous(index >> KPagesInPDEShift));
sl@0: 		MmuLock::Unlock();
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	// unmap pages in all page tables and fine mappings
sl@0: 	DCoarseMemory::UnmapPages(aPages, aDecommitting);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void DLargeMappedMemory::RestrictPages(RPageArray::TIter aPages, TRestrictPagesType aRestriction)
sl@0: 	{
sl@0: 	TRACE2(("DLargeMappedMemory[0x%08x]::RestrictPages(?,%d) index=0x%x count=0x%x",this,aRestriction,aPages.Index(),aPages.Count()));
sl@0: 
sl@0: 	// assert pages do not overlapped a contiguous area...
sl@0: #ifdef _DEBUG
sl@0: 	for (TUint index = aPages.Index() ; index < aPages.IndexEnd() ; index += KPagesInPDE)
sl@0: 		{
sl@0: 		MmuLock::Lock();
sl@0: 		__NK_ASSERT_DEBUG(!IsChunkContiguous(index >> KPagesInPDEShift));
sl@0: 		MmuLock::Unlock();
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	DCoarseMemory::RestrictPages(aPages, aRestriction);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TBool DLargeMappedMemory::IsChunkContiguous(TInt aChunkIndex)
sl@0: 	{
sl@0: 	__NK_ASSERT_DEBUG(MmuLock::IsHeld());
sl@0: 	TUint index = aChunkIndex >> 5;
sl@0: 	TUint mask = 1 << (aChunkIndex & 31);
sl@0: 	return (iContiguousState[index] & mask) != 0;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void DLargeMappedMemory::SetChunkContiguous(TInt aChunkIndex, TBool aIsContiguous)
sl@0: 	{
sl@0: 	__NK_ASSERT_DEBUG(MmuLock::IsHeld());
sl@0: 	TUint index = aChunkIndex >> 5;
sl@0: 	TUint mask = 1 << (aChunkIndex & 31);
sl@0: 	iContiguousState[index] = (iContiguousState[index] & ~mask) | (aIsContiguous ? mask : 0);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: //
sl@0: // DLargeMapping
sl@0: //
sl@0: 
sl@0: 
sl@0: DLargeMapping::DLargeMapping() : DCoarseMapping(ELargeMapping)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TInt DLargeMapping::DoMap()
sl@0: 	{
sl@0: 	TRACE(("DLargeMapping[0x%08x]::DoMap()", this));
sl@0: 	__NK_ASSERT_DEBUG(((iStartIndex|iSizeInPages)&(KChunkMask>>KPageShift))==0); // be extra paranoid about alignment
sl@0: 
sl@0: 	MmuLock::Lock();
sl@0: 
sl@0: 	TPde* pPde = Mmu::PageDirectoryEntry(OsAsid(),Base());
sl@0: 	DLargeMappedMemory* memory = (DLargeMappedMemory*)Memory(ETrue); // safe because we're called from code which has added mapping to memory
sl@0: 	
sl@0: 	TUint flash = 0;
sl@0: 	TUint chunk = iStartIndex >> KPagesInPDEShift;
sl@0: 	TUint endChunk = (iStartIndex + iSizeInPages) >> KPagesInPDEShift;
sl@0: 	
sl@0: 	while(chunk < endChunk)
sl@0: 		{
sl@0: 		MmuLock::Flash(flash,KMaxPdesInOneGo*2);
sl@0: 		TPde pde = KPdeUnallocatedEntry;
sl@0: 		TPte* pt = memory->GetPageTable(PteType(), chunk);
sl@0: 		if (memory->IsChunkContiguous(chunk))
sl@0: 			pde = Mmu::PageToSectionEntry(pt[0],iBlankPde); // todo: use get phys addr?
sl@0: 		else if (pt)
sl@0: 			pde = Mmu::PageTablePhysAddr(pt)|iBlankPde;
sl@0: 
sl@0: 		if (pde == KPdeUnallocatedEntry)
sl@0: 			{
sl@0: 			TRACE2(("!PDE %x=%x (was %x)",pPde,KPdeUnallocatedEntry,*pPde));
sl@0: 			__NK_ASSERT_DEBUG(*pPde==KPdeUnallocatedEntry);
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			TRACE2(("!PDE %x=%x (was %x)",pPde,pde,*pPde));
sl@0: 			__NK_ASSERT_DEBUG(*pPde==KPdeUnallocatedEntry || ((*pPde^pde)&~KPdeMatchMask)==0);
sl@0: 			*pPde = pde;
sl@0: 			SinglePdeUpdated(pPde);
sl@0: 			flash += 3; // increase flash rate because we've done quite a bit more work
sl@0: 			}
sl@0: 
sl@0: 		++pPde;
sl@0: 		++chunk;
sl@0: 		}
sl@0: 	MmuLock::Unlock();
sl@0: 
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void DLargeMapping::RemapPage(TPhysAddr& aPageArray, TUint aIndex, TUint aMapInstanceCount, TBool aInvalidateTLB)
sl@0: 	{
sl@0: 	TRACE(("DLargeMapping[0x%08x]::RemapPage(%08x, %d, %d, %d)", this, aPageArray, aIndex, aMapInstanceCount, aInvalidateTLB));
sl@0: 
sl@0: 	TInt chunkIndex = aIndex >> KPagesInPDEShift;
sl@0: 
sl@0: 	MmuLock::Lock();
sl@0: 	DLargeMappedMemory* memory = (DLargeMappedMemory*)Memory(); // safe because we're called from code which has reference on tables, which has reference on memory
sl@0: 	TPte* pt = memory->GetPageTable(PteType(), chunkIndex);
sl@0: 	
sl@0: 	// check the page is still mapped and mapping isn't being detached 
sl@0: 	// or hasn't been reused for another purpose...
sl@0: 	if(!pt || BeingDetached() || aMapInstanceCount != MapInstanceCount())
sl@0: 		{
sl@0: 		// can't map pages to this mapping any more so just exit.
sl@0: 		TRACE(("  page no longer mapped"));
sl@0: 		MmuLock::Unlock();
sl@0: 		return;
sl@0: 		}
sl@0: 	
sl@0: 	TPde* pPde = Mmu::PageDirectoryEntry(OsAsid(),Base() + (chunkIndex << KChunkShift));
sl@0: 	TPde currentPde = *pPde;
sl@0: 	
sl@0: 	if (!memory->IsChunkContiguous(chunkIndex) && Mmu::PdeMapsSection(currentPde))
sl@0: 		{
sl@0: 		// break section mapping and replace with page table...
sl@0: 		TRACE2(("  breaking section mapping"));
sl@0: 		TPde pde = Mmu::PageTablePhysAddr(pt)|iBlankPde;
sl@0: 		TRACE2(("!PDE %x=%x (was %x)",pPde,pde,*pPde));
sl@0: 		// can't assert old value if the first page has been remapped
sl@0: 		__NK_ASSERT_DEBUG((aIndex & (KPagesInPDE - 1)) == 0 ||
sl@0: 						  *pPde == Mmu::PageToSectionEntry(pt[0],iBlankPde));
sl@0: 		*pPde = pde;
sl@0: 		SinglePdeUpdated(pPde);
sl@0: 		MmuLock::Unlock();
sl@0: #ifndef COARSE_GRAINED_TLB_MAINTENANCE
sl@0: 		if (aInvalidateTLB) 
sl@0: 			{
sl@0: 			// invalidate chunk...
sl@0: 			TUint start = (chunkIndex << KPagesInPDEShift) - iStartIndex;
sl@0: 			TLinAddr addr = LinAddrAndOsAsid() + (start << KPageShift);
sl@0: 			TLinAddr endAddr = addr + KChunkSize;
sl@0: 			do InvalidateTLBForPage(addr);
sl@0: 			while((addr+=KPageSize)<endAddr);
sl@0: 			InvalidateTLBForPage(addr);
sl@0: 			}
sl@0: #endif
sl@0: 		}
sl@0: 	else if (memory->IsChunkContiguous(chunkIndex) && Mmu::PdeMapsPageTable(currentPde))
sl@0: 		{
sl@0: 		// reform section mapping...
sl@0: 		TRACE2(("  reforming section mapping"));
sl@0: 		__NK_ASSERT_ALWAYS(0); // todo: not yet implemented
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		// remap already handled by page table update in DPageTables...
sl@0: 		MmuLock::Unlock();
sl@0: #ifndef COARSE_GRAINED_TLB_MAINTENANCE
sl@0: 		if (aInvalidateTLB)
sl@0: 			{
sl@0: 			// invalidate page...
sl@0: 			TUint start = aIndex - iStartIndex;
sl@0: 			TLinAddr addr = LinAddrAndOsAsid() + (start << KPageShift);
sl@0: 			InvalidateTLBForPage(addr);
sl@0: 			}
sl@0: #endif
sl@0: 		}
sl@0: 	
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TInt DLargeMapping::PageIn(RPageArray::TIter aPages, TPinArgs& aPinArgs, TUint aMapInstanceCount)
sl@0: 	{
sl@0: 	TRACE(("DLargeMapping[0x%08x]::PageIn(%d, %d, ?, %d)", this, aPages.Index(), aPages.Count(), aMapInstanceCount));
sl@0: #ifdef _DEBUG
sl@0: 	// assert that we're not trying to page in any section mapped pages
sl@0: 	TUint startIndex = aPages.Index();
sl@0: 	TUint endIndex = startIndex + aPages.Count();
sl@0: 	for (TUint index = startIndex ; index < endIndex ; index += KPagesInPDE)
sl@0: 		{
sl@0: 		TLinAddr addr = Base() + ((index - iStartIndex) << KPageShift);
sl@0: 		TRACE2(("  checking page %d at %08x", index, addr));
sl@0: 		TPde* pPde = Mmu::PageDirectoryEntry(OsAsid(),addr);
sl@0: 		__NK_ASSERT_DEBUG(!Mmu::PdeMapsSection(*pPde));
sl@0: 		}
sl@0: #endif	
sl@0: 	return DCoarseMapping::PageIn(aPages, aPinArgs, aMapInstanceCount);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TBool DLargeMapping::MovingPageIn(TPhysAddr& aPageArrayPtr, TUint aIndex)
sl@0: 	{
sl@0: 	// this shouldn't ever be called as it's only used by ram defrag
sl@0: 	__NK_ASSERT_DEBUG(EFalse);
sl@0: 	return EFalse;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TPte* DLargeMapping::FindPageTable(TLinAddr aLinAddr, TUint aMemoryIndex)
sl@0: 	{
sl@0: 	// this shouldn't ever be called as it's only used by ram defrag
sl@0: 	__NK_ASSERT_DEBUG(EFalse);
sl@0: 	return NULL;
sl@0: 	}