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// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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/**
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@file
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@internalComponent
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*/
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#ifndef MOBJECT_H
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#define MOBJECT_H
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#include "mrefcntobj.h"
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#include "mmappinglist.h"
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#include "mpagearray.h"
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class DMemoryManager;
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class DCoarseMapping;
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/**
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Base class for memory objects.
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A memory object is a sparse array of memory pages (#iPages) to which memory
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mappings may be attached (#iMappings). All pages in the array are managed
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in the same way (#iManager).
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*/
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class DMemoryObject : public DReferenceCountedObject
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{
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public:
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virtual ~DMemoryObject();
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/**
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Claim ownership of memory originally allocated by the bootstrap.
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This is used during system boot to initialise this object's memory to contain
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the pages which are already mapped at a given region of virtual addresses.
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For coarse memory objects, this function also takes ownership of the page tables
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being used to map the memory.
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@param aBase Starting virtual address of memory to claim.
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@param aSize Size, in bytes, of memory region to claim.
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@param aPermissions The access permissions which the memory region
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is mapped. As well as being required for correct object
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initialisation this also enables the function to check
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that the bootstrap code mapped the memory in manner
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consistent with the flexible memory model implementation.
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@param aAllowGaps True if the memory region may have gaps (unmapped pages) in it.
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If false, the function faults if the region is not fully
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populated with mapped pages.
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@param aAllowNonRamPages True if the memory region contains memory pages which are
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not RAM pages known to the kernel. I.e. are not
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contained in the list of RAM banks supplied by the bootstrap.
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Any such memory cannot be never be subsequently freed from the
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memory object because the kernel can't handle this memory.
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@return KErrNone if successful, otherwise one of the system wide error codes.
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*/
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virtual TInt ClaimInitialPages(TLinAddr aBase, TUint aSize, TMappingPermissions aPermissions, TBool aAllowGaps=false, TBool aAllowNonRamPages=false) = 0;
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/**
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Update the page table entries for all attached mappings to add entries for
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a specified set of memory pages.
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This method is called by this object's manager whenever new pages of memory are added.
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@param aPages An RPageArray::TIter which refers to a range of pages
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in this memory object.
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Only array entries which have state RPageArray::ECommitted
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should be mapped into a mapping's page tables.
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@return KErrNone if successful, otherwise one of the system wide error codes.
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*/
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virtual TInt MapPages(RPageArray::TIter aPages);
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/**
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Update the page table entries for all attached mappings to add new entry for
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a specified memory page.
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This method is called by this object's manager whenever the page is moved.
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@param aPageArray The page array entry of the page in this memory object.
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Only array entries which have state RPageArray::ECommitted
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should be mapped into a mapping's page tables.
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@param aIndex The index of the page in this memory object.
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@param aInvalidateTLB Set to ETrue when the TLB entries associated with this page
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should be invalidated. This must be done when there is
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already a valid pte for this page, i.e. if the page is still
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mapped.
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@return KErrNone if successful, otherwise one of the system wide error codes.
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*/
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virtual void RemapPage(TPhysAddr& aPageArray, TUint aIndex, TBool aInvalidateTLB);
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/**
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Update the page table entries for all attached mappings to remove entries for
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a specified set of memory pages.
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This method is called this object's manager whenever pages of memory are removed.
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@param aPages An RPageArray::TIter which refers to a range of pages
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in this memory object.
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Only array entries which return true for
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RPageArray::TargetStateIsDecommitted should be unmapped
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from a mapping's page tables.
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@param aDecommitting True if memory is being permanently decommitted from
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the memory object. False if the memory pages are only
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temporarily being unmapped due to a demand paging 'page out'
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operation.
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*/
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virtual void UnmapPages(RPageArray::TIter aPages, TBool aDecommitting);
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/**
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Update the page table entries for all attached mappings to apply access restrictions
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to a specified set of memory pages.
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This method is called by this object's manager whenever pages of memory are restricted.
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@param aPages An RPageArray::TIter which refers to a range of pages
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in this memory object.
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Only array entries which return true for
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RPageArray::TargetStateIsDecommitted should be unmapped
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from a mapping's page tables.
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@param aRestriction A value from enum #TRestrictPagesType indicating the
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kind of restriction to apply.
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*/
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virtual void RestrictPages(RPageArray::TIter aPages, TRestrictPagesType aRestriction);
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/**
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Add a memory mapping to this memory object.
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This is only intended for use by #DMemoryMappingBase::Attach.
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After verifying that the mapping is permitted (using #CheckNewMapping)
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the mapping is linked into this objects list of mappings #iMappings.
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@param aMapping The mapping to add.
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@return KErrNone if successful,
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otherwise KErrAccessDenied to indicate that the mapping is not allowed.
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*/
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virtual TInt AddMapping(DMemoryMappingBase* aMapping);
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/**
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Remove a memory mapping from this memory object.
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This is only intended for use by #DMemoryMappingBase::Detach.
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This unlinks the mapping from the list of mappings #iMappings.
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@param aMapping The mapping to remove.
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*/
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virtual void RemoveMapping(DMemoryMappingBase* aMapping);
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/**
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Attempt to set the memory object read only. This will only succeed if
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there are no writable mappings to the memory object.
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NOTE - This can't be undone, page moving will break if a memory object
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is made writable again.
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@return KErrNone on success, KErrInUse if writable mappings are found.
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*/
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virtual TInt SetReadOnly();
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/**
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Create a mapping object to map this memory.
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This is only intended for use by #MM::MappingNew.
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The base class creates a #DFineMapping object. It is overridden by #DCoarseMemory to create a
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#DCoarseMapping in appropriate circumstances.
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@param aIndex The index of the start of the mapping into this memory object.
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@oaram aCount The size in pages of the mapping.
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*/
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virtual DMemoryMapping* CreateMapping(TUint aIndex, TUint aCount);
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/**
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Get the physical address(es) for a region of pages in this memory object.
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Depending on how the memory is being managed the physical addresses returned
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may become invalid due to various reasons, e.g.
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- memory being decommitted from the memory object
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- ram defragmentation moving the memory contents to a different physical page
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- paging out of demand paged memory
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This function should therefore only be used where it is know that these
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possibilities can't occur, e.g. this is used safely by DPhysicalPinMapping::PhysAddr.
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@param aIndex Page index, within the memory, for the start of the region.
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@param aCount Number of pages in the region.
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@param aPhysicalAddress On success, this value is set to one of two values.
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If the specified region is physically contiguous,
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the value is the physical address of the first page
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in the region. If the region is discontiguous, the
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value is set to KPhysAddrInvalid.
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@param aPhysicalPageList If not zero, this points to an array of TPhysAddr
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objects. On success, this array will be filled
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with the addresses of the physical pages which
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contain the specified region. If aPageList is
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zero, then the function will fail with
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KErrNotFound if the specified region is not
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physically contiguous.
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@return 0 if successful and the whole region is physically contiguous.
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1 if successful but the region isn't physically contiguous.
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KErrNotFound, if any page in the region is not present,
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otherwise one of the system wide error codes.
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*/
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TInt PhysAddr(TUint aIndex, TUint aCount, TPhysAddr& aPhysicalAddress, TPhysAddr* aPhysicalPageList);
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/**
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Check specified region lies entirely within this memory object, and that it
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is page aligned.
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*/
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TBool CheckRegion(TUint aIndex, TUint aCount);
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/**
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Clip the specified region to lie within the memory object,
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*/
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void ClipRegion(TUint& aIndex, TUint& aCount);
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/**
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Set the mutex used to lock operations on this memory object
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*/
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void SetLock(DMutex* aLock);
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/**
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Prevents any further mappings being added to this memory object.
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*/
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void DenyMappings();
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/**
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Return the memory attributes for this object's memory.
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*/
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FORCE_INLINE TMemoryAttributes Attributes()
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{
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return (TMemoryAttributes)iAttributes;
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}
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/**
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Value for initialising SPageInfo::iFlags when allocating pages.
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*/
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FORCE_INLINE TUint8 PageInfoFlags()
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{
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return iAttributes;
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}
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/**
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Value for #Mmu::TRamAllocFlags to use when allocating pages.
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*/
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FORCE_INLINE Mmu::TRamAllocFlags RamAllocFlags()
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{
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return (Mmu::TRamAllocFlags)iRamAllocFlags;
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}
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/**
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Return true if this object is an instance of #DCoarseMemory.
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*/
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FORCE_INLINE TBool IsCoarse()
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{
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return iFlags&ECoarseObject;
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}
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/**
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Return true if this object contains memory which is being demand paged.
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*/
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FORCE_INLINE TBool IsDemandPaged()
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{
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return iFlags&EDemandPaged;
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}
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/**
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Return true if writeable mappings of the memory are not allowed.
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*/
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FORCE_INLINE TBool IsReadOnly()
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{
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return iFlags&EDenyWriteMappings;
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}
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/**
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Return true if executable mappings allowed on this memory object.
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*/
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FORCE_INLINE TBool IsExecutable()
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{
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return !(iFlags&EDenyExecuteMappings);
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}
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/**
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Clear the flag that indicates that a mapping has been added.
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*/
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FORCE_INLINE void ClearMappingAddedFlag()
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{
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__NK_ASSERT_DEBUG(iMappings.LockIsHeld());
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__e32_atomic_and_ord8(&iFlags, (TUint8)~EMappingAdded);
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}
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/**
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Set the flag to indicate that a mapping has been added.
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*/
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FORCE_INLINE void SetMappingAddedFlag()
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{
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__NK_ASSERT_DEBUG(iMappings.LockIsHeld());
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__NK_ASSERT_DEBUG(MmuLock::IsHeld());
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__e32_atomic_ior_ord8(&iFlags, (TUint8)EMappingAdded);
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}
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/**
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Get the value of the mappings added flags
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@return ETrue if a mapping has been added, EFalse otherwise.
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*/
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FORCE_INLINE TBool MappingAddedFlag()
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{
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__NK_ASSERT_DEBUG(MmuLock::IsHeld());
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return iFlags & (TUint8)EMappingAdded;
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}
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enum
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{
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/**
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Maximum number of bits which can be stored in an array entry by SetPagingManagerData.
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*/
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KPagingManagerDataBits = RPageArray::KPagingManagerDataBits
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};
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enum
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{
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/**
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Maximum value which can be stored in an array entry by SetPagingManagerData.
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*/
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KMaxPagingManagerData = RPageArray::KMaxPagingManagerData
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};
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/**
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Write \a aValue to the paging manager data for page index \a aIndex.
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The value must not exceed KMaxPagingManagerData.
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This must only be used for demand paged memory objects.
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*/
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void SetPagingManagerData(TUint aIndex, TUint aValue);
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/**
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Return the paging manager data for page index \a aIndex.
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This must only be used for demand paged memory objects.
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@see SetPagingManagerData
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*/
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TUint PagingManagerData(TUint aIndex);
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/**
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Check that a given memory mapping is allowed to be attached to this memory object.
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@param aMapping The mapping to check.
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@return KErrNone if successful,
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otherwise KErrAccessDenied to indicate that the mapping is not allowed.
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*/
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TInt CheckNewMapping(DMemoryMappingBase* aMapping);
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/**
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Emit BTrace traces identifying the initial attributes of this object.
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*/
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void BTraceCreate();
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protected:
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/**
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@param aManager The manager object for this memory.
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@param aFlags Initial value for #iFlags.
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@param aSizeInPages Size of the memory object, in number of pages.
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@param aAttributes Bitmask of values from enum #TMemoryAttributes.
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@param aCreateFlags Bitmask of option flags from enum #TMemoryCreateFlags.
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*/
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DMemoryObject(DMemoryManager* aManager, TUint aFlags, TUint aSizeInPages, TMemoryAttributes aAttributes, TMemoryCreateFlags aCreateFlags);
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/**
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Second phase constructor.
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@return KErrNone if successful, otherwise one of the system wide error codes.
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*/
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TInt Construct();
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public:
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/**
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The manager of this memory object.
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*/
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DMemoryManager* iManager;
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/**
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For use by this object's manager (iManager) to store any memory objects specific state
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it requires to keep track of.
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*/
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TAny* iManagerData;
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/**
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For use by DMemoryManager::QueueCleanup to link objects which require a cleanup operation.
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Access to this is protected by #DMemoryManager::iCleanupLock.
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*/
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DMemoryObject* iCleanupNext;
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/**
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For use by DMemoryManager::QueueCleanup to store flags representing each pending cleanup operation.
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Access to this is protected by #DMemoryManager::iCleanupLock.
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*/
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TUint32 iCleanupFlags;
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/**
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Bit flags stored in #iFlags giving various state and attributes of the object.
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*/
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enum TFlags
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{
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/**
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Flag set during object construction to indicate that this mapping is of
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class #DCoarseMemory.
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*/
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ECoarseObject = 1<<0,
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/**
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Flag set during object construction to indicate that the memory for this object
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is being demand paged in some manner.
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441 |
*/
|
|
442 |
EDemandPaged = 1<<1,
|
|
443 |
|
|
444 |
/**
|
|
445 |
Flag set during object construction to indicate that all resources for this
|
|
446 |
object are to be reserved during construction; excluding memory pages owned by
|
|
447 |
object. Objects constructed in this way will not require additional memory
|
|
448 |
allocation when committing memory to them (other than allocating the memory
|
|
449 |
pages being committed.)
|
|
450 |
*/
|
|
451 |
EReserveResources = 1<<2,
|
|
452 |
|
|
453 |
/**
|
|
454 |
Flag set during object construction to indicate that pinned memory mappings
|
|
455 |
are not allowed to be attached to this object.
|
|
456 |
*/
|
|
457 |
EDenyPinning = 1<<3,
|
|
458 |
|
|
459 |
/**
|
|
460 |
Flag set by DenyMappings to indicate that no additional memory mappings
|
|
461 |
are allowed to be attached to this object.
|
|
462 |
*/
|
|
463 |
EDenyMappings = 1<<4,
|
|
464 |
|
|
465 |
/**
|
|
466 |
Flag set during object construction, or by SetReadOnly, to indicate that
|
|
467 |
the memory object is read-only and no writable mappings are allowed
|
|
468 |
to be attached to this object.
|
|
469 |
*/
|
|
470 |
EDenyWriteMappings = 1<<5,
|
|
471 |
|
|
472 |
/**
|
|
473 |
Flag set during object construction to indicate that executable memory mappings
|
|
474 |
are not allowed to be attached to this object.
|
|
475 |
This is mainly an optimisation to allow demand paging to avoid instruction cache
|
|
476 |
maintenance operations during page fault handling.
|
|
477 |
*/
|
|
478 |
EDenyExecuteMappings = 1<<6,
|
|
479 |
|
|
480 |
/**
|
|
481 |
Flag set whenever a new mapping is added to a memory object.
|
|
482 |
The object's mappings lock and MmuLock protects this flag when it is set
|
|
483 |
and the mappings lock protects when it is cleared.
|
|
484 |
*/
|
|
485 |
EMappingAdded = 1<<7,
|
|
486 |
};
|
|
487 |
|
|
488 |
/**
|
|
489 |
Bitmask of TFlags
|
|
490 |
*/
|
|
491 |
TUint8 iFlags;
|
|
492 |
|
|
493 |
/**
|
|
494 |
Value from TMemoryAttributes indicating type of memory in object.
|
|
495 |
*/
|
|
496 |
TUint8 iAttributes;
|
|
497 |
|
|
498 |
/**
|
|
499 |
#Mmu::TRamAllocFlags value to use when allocating RAM for this memory object.
|
|
500 |
*/
|
|
501 |
TUint16 iRamAllocFlags;
|
|
502 |
|
|
503 |
/**
|
|
504 |
List of mappings currently attached to this object.
|
|
505 |
*/
|
|
506 |
TMappingList iMappings;
|
|
507 |
|
|
508 |
/**
|
|
509 |
Size, in page units, of this memory object.
|
|
510 |
*/
|
|
511 |
TUint iSizeInPages;
|
|
512 |
|
|
513 |
/**
|
|
514 |
Lock currently being used to serialise explicit memory operations.
|
|
515 |
This is assigned using #MemoryObjectLock.
|
|
516 |
*/
|
|
517 |
DMutex* iLock;
|
|
518 |
|
|
519 |
/**
|
|
520 |
The array of memory pages assigned to this memory object.
|
|
521 |
*/
|
|
522 |
RPageArray iPages;
|
|
523 |
};
|
|
524 |
|
|
525 |
|
|
526 |
|
|
527 |
/**
|
|
528 |
A memory object which has a size that is an exact multiple
|
|
529 |
multiple of the region covered by a whole MMU page table;
|
|
530 |
that is a 'chunk' size (#KChunkSize) bytes.
|
|
531 |
|
|
532 |
When used in conjunction with DCoarseMapping this object
|
|
533 |
allows RAM to be saved by sharing MMU page tables between multiple
|
|
534 |
different mappings of the memory.
|
|
535 |
|
|
536 |
Fine memory mappings (DFineMapping) may also be attached
|
|
537 |
to this memory object but these won't benefit from page table
|
|
538 |
sharing.
|
|
539 |
*/
|
|
540 |
class DCoarseMemory : public DMemoryObject
|
|
541 |
{
|
|
542 |
public:
|
|
543 |
// from DMemoryObject...
|
|
544 |
virtual ~DCoarseMemory();
|
|
545 |
virtual TInt ClaimInitialPages(TLinAddr aBase, TUint aSize, TMappingPermissions aPermissions, TBool aAllowGaps=false, TBool aAllowNonRamPages=false);
|
|
546 |
virtual TInt MapPages(RPageArray::TIter aPages);
|
|
547 |
virtual void RemapPage(TPhysAddr& aPageArray, TUint aIndex, TBool aInvalidateTLB);
|
|
548 |
virtual void UnmapPages(RPageArray::TIter aPages, TBool aDecommitting);
|
|
549 |
virtual void RestrictPages(RPageArray::TIter aPages, TRestrictPagesType aRestriction);
|
|
550 |
virtual TInt AddMapping(DMemoryMappingBase* aMapping);
|
|
551 |
virtual void RemoveMapping(DMemoryMappingBase* aMapping);
|
|
552 |
virtual TInt SetReadOnly();
|
|
553 |
virtual DMemoryMapping* CreateMapping(TUint aIndex, TUint aCount);
|
|
554 |
public:
|
|
555 |
/**
|
|
556 |
Create a new DCoarseMemory object.
|
|
557 |
|
|
558 |
@param aManager The manager object for this memory.
|
|
559 |
@param aSizeInPages Size of the memory object, in number of pages.
|
|
560 |
(Must represent an exact 'chunk' size.)
|
|
561 |
@param aAttributes Bitmask of values from enum #TMemoryAttributes.
|
|
562 |
@param aCreateFlags Bitmask of option flags from enum #TMemoryCreateFlags.
|
|
563 |
|
|
564 |
@return The newly created DCoarseMemory or the null pointer if there was
|
|
565 |
insufficient memory.
|
|
566 |
*/
|
|
567 |
static DCoarseMemory* New(DMemoryManager* aManager, TUint aSizeInPages, TMemoryAttributes aAttributes, TMemoryCreateFlags aCreateFlags);
|
|
568 |
|
|
569 |
/**
|
|
570 |
Remove an mmu page table from this memory object's ownership.
|
|
571 |
This is called when a RAM page containing the page table is paged out.
|
|
572 |
This function delegates its action to DPageTables::StealPageTable.
|
|
573 |
|
|
574 |
@param aChunkIndex The index of the page table, i.e. the offset, in 'chunks',
|
|
575 |
into the object's memory that the page table is being used to map.
|
|
576 |
(The index into DPageTables::iTables.)
|
|
577 |
@param aPteType The #TPteType the page table is being used for.
|
|
578 |
(The index into #iPageTables.)
|
|
579 |
|
|
580 |
@pre #MmuLock is held.
|
|
581 |
@pre #PageTablesLockIsHeld
|
|
582 |
*/
|
|
583 |
void StealPageTable(TUint aChunkIndex, TUint aPteType);
|
|
584 |
|
|
585 |
public:
|
|
586 |
// Interface for DCoarseMapping
|
|
587 |
|
|
588 |
/**
|
|
589 |
Get the page table to use for mapping a specified chunk if it exists.
|
|
590 |
|
|
591 |
@param aPteType The #TPteType the page tables will be used for.
|
|
592 |
@param aChunkIndex The index of the chunk.
|
|
593 |
|
|
594 |
@return The virtual address of the page table, or NULL.
|
|
595 |
|
|
596 |
@pre #MmuLock is held.
|
|
597 |
*/
|
|
598 |
TPte* GetPageTable(TUint aPteType , TUint aChunkIndex);
|
|
599 |
|
|
600 |
/**
|
|
601 |
Update the page tables to add entries for a specified set of demand paged memory
|
|
602 |
pages following a 'page in' or memory pinning operation.
|
|
603 |
|
|
604 |
@param aMapping The mapping the pages are being paged into.
|
|
605 |
|
|
606 |
@param aPages An RPageArray::TIter which refers to a range of pages
|
|
607 |
in the memory object #iMemory.
|
|
608 |
Only array entries which have state RPageArray::ECommitted
|
|
609 |
should be mapped into the page tables.
|
|
610 |
|
|
611 |
@param aPinArgs The resources required to pin any page tables.
|
|
612 |
Page table must be pinned if \a aPinArgs.iPinnedPageTables is
|
|
613 |
not the null pointer, in which case this the virtual address
|
|
614 |
of the pinned must be stored in the array this points to.
|
|
615 |
\a aPinArgs.iReadOnly is true if write access permissions
|
|
616 |
are not needed.
|
|
617 |
|
|
618 |
@return KErrNone if successful, otherwise one of the system wide error codes.
|
|
619 |
|
|
620 |
@pre #MmuLock is held.
|
|
621 |
@post #MmuLock has been released.
|
|
622 |
*/
|
|
623 |
TInt PageIn(DCoarseMapping* aMapping, RPageArray::TIter aPages, TPinArgs& aPinArgs, TUint aMapInstanceCount);
|
|
624 |
|
|
625 |
/**
|
|
626 |
Update the page table entries to renable access to a specified memory page.
|
|
627 |
|
|
628 |
This method is called by #DCoarseMapping::MovingPageIn
|
|
629 |
|
|
630 |
@param aMapping The mapping which maps the page.
|
|
631 |
@param aPageArrayPtr The page array entry of the page to map.
|
|
632 |
Only array entries which have state RPageArray::ECommitted
|
|
633 |
should be mapped into a mapping's page tables.
|
|
634 |
|
|
635 |
@param aIndex The index of the memory page.
|
|
636 |
*/
|
|
637 |
TBool MovingPageIn(DCoarseMapping* aMapping, TPhysAddr& aPageArrayPtr, TUint aIndex);
|
|
638 |
|
|
639 |
/**
|
|
640 |
Function to return a page table pointer for the specified linear address and
|
|
641 |
index to this mapping.
|
|
642 |
|
|
643 |
This method is called by #DCoarseMapping::FindPageTable.
|
|
644 |
|
|
645 |
@param aLinAddr The linear address to find the page table entry for.
|
|
646 |
@param aMemoryIndex The memory object index of the page to find the page
|
|
647 |
table entry for.
|
|
648 |
|
|
649 |
@return A pointer to the page table entry, if the page table entry couldn't
|
|
650 |
be found this will be NULL
|
|
651 |
*/
|
|
652 |
TPte* FindPageTable(DCoarseMapping* aMapping, TLinAddr aLinAddr, TUint aMemoryIndex);
|
|
653 |
|
|
654 |
protected:
|
|
655 |
/**
|
|
656 |
For arguments, see #New.
|
|
657 |
*/
|
|
658 |
DCoarseMemory(DMemoryManager* aManager, TUint aSizeInPages, TMemoryAttributes aAttributes, TMemoryCreateFlags aCreateFlags);
|
|
659 |
|
|
660 |
public:
|
|
661 |
/**
|
|
662 |
The object which manages the page tables owned by a #DCoarseMemory object
|
|
663 |
and used by #DCoarseMapping objects. Each DPageTables is used for mappings
|
|
664 |
with a specific #TPteType e.g. set of memory access permissions, and all these
|
|
665 |
#DCoarseMapping objects are linked into this object whenever they are
|
|
666 |
attached to a DCoarseMemory.
|
|
667 |
*/
|
|
668 |
class DPageTables : public DReferenceCountedObject
|
|
669 |
{
|
|
670 |
public:
|
|
671 |
/**
|
|
672 |
Create a new DPageTables.
|
|
673 |
|
|
674 |
This object is added to DCoarseMemory::iPageTables and all of
|
|
675 |
the mmu page tables will be initialised to map the memory currently
|
|
676 |
owned by the memory object (unless memory is demand paged).
|
|
677 |
|
|
678 |
|
|
679 |
@param aMemory The DCoarseMemory the new object is associated with.
|
|
680 |
@param aNumPages Size of the memory object, in number of pages.
|
|
681 |
(Must represent an exact 'chunk' size.)
|
|
682 |
@param aPteType The #TPteType the page tables will be used for.
|
|
683 |
|
|
684 |
@return The newly created DPageTables or the null pointer if there was
|
|
685 |
insufficient memory.
|
|
686 |
|
|
687 |
@pre The #MemoryObjectLock for the memory must be held by the current thread.
|
|
688 |
*/
|
|
689 |
static DPageTables* New(DCoarseMemory* aMemory, TUint aNumPages, TUint aPteType);
|
|
690 |
|
|
691 |
virtual ~DPageTables();
|
|
692 |
|
|
693 |
/**
|
|
694 |
Update the page tables to add entries for a specified set of memory pages.
|
|
695 |
|
|
696 |
This method is called by #DCoarseMemory::MapPages.
|
|
697 |
|
|
698 |
@param aPages An RPageArray::TIter which refers to a range of pages
|
|
699 |
in the memory object #iMemory.
|
|
700 |
Only array entries which have state RPageArray::ECommitted
|
|
701 |
should be mapped into the page tables.
|
|
702 |
|
|
703 |
@return KErrNone if successful, otherwise one of the system wide error codes.
|
|
704 |
*/
|
|
705 |
virtual TInt MapPages(RPageArray::TIter aPages);
|
|
706 |
|
|
707 |
/**
|
|
708 |
Update the page table entries for a specified memory page.
|
|
709 |
|
|
710 |
This method is called by #DCoarseMemory::RemapPage
|
|
711 |
|
|
712 |
@param aPageArray The page array entry of the page in this memory object.
|
|
713 |
Only array entries which have state RPageArray::ECommitted
|
|
714 |
should be mapped into a mapping's page tables.
|
|
715 |
|
|
716 |
@param aIndex The index of the page in this memory object.
|
|
717 |
|
|
718 |
@param aInvalidateTLB Set to ETrue when the TLB entries associated with this page
|
|
719 |
should be invalidated. This must be done when there is
|
|
720 |
already a valid pte for this page, i.e. if the page is still
|
|
721 |
mapped.
|
|
722 |
*/
|
|
723 |
virtual void RemapPage(TPhysAddr& aPageArray, TUint aIndex, TBool aInvalidateTLB);
|
|
724 |
|
|
725 |
/**
|
|
726 |
Update the page table entries to renable access to a specified memory page.
|
|
727 |
|
|
728 |
This method is called by #DCoarseMemory::MovingPageIn
|
|
729 |
|
|
730 |
@param aPageArrayPtr The page array entry of the page to map.
|
|
731 |
Only array entries which have state RPageArray::ECommitted
|
|
732 |
should be mapped into a mapping's page tables.
|
|
733 |
|
|
734 |
@param aIndex The index of the memory page.
|
|
735 |
*/
|
|
736 |
virtual TBool MovingPageIn(TPhysAddr& aPageArrayPtr, TUint aIndex);
|
|
737 |
|
|
738 |
|
|
739 |
/**
|
|
740 |
Update the page tables to remove entries for a specified set of memory pages.
|
|
741 |
|
|
742 |
This method is called by #DCoarseMemory::UnmapPages.
|
|
743 |
|
|
744 |
@param aPages An RPageArray::TIter which refers to a range of pages
|
|
745 |
in the memory object #iMemory.
|
|
746 |
Only array entries which return true for
|
|
747 |
RPageArray::TargetStateIsDecommitted should be unmapped
|
|
748 |
from the page tables.
|
|
749 |
|
|
750 |
@param aDecommitting True if memory is being permanently decommitted from
|
|
751 |
the memory object. False if the memory pages are only
|
|
752 |
temporarily being unmapped due to a demand paging 'page out'
|
|
753 |
operation.
|
|
754 |
*/
|
|
755 |
virtual void UnmapPages(RPageArray::TIter aPages, TBool aDecommitting);
|
|
756 |
|
|
757 |
/**
|
|
758 |
Update the page tables to apply access restrictions to a specified set of memory pages.
|
|
759 |
|
|
760 |
This method is called by #DCoarseMemory::RestrictPagesNA.
|
|
761 |
|
|
762 |
@param aPages An RPageArray::TIter which refers to a range of pages
|
|
763 |
in the memory object #iMemory.
|
|
764 |
Only array entries which return true for
|
|
765 |
RPageArray::TargetStateIsDecommitted should be unmapped
|
|
766 |
from the page tables.
|
|
767 |
*/
|
|
768 |
virtual void RestrictPagesNA(RPageArray::TIter aPages);
|
|
769 |
|
|
770 |
/**
|
|
771 |
Update the page tables to add entries for a specified set of demand paged memory
|
|
772 |
pages following a 'page in' or memory pinning operation.
|
|
773 |
|
|
774 |
@param aPages An RPageArray::TIter which refers to a range of pages
|
|
775 |
in the memory object #iMemory.
|
|
776 |
Only array entries which have state RPageArray::ECommitted
|
|
777 |
should be mapped into the page tables.
|
|
778 |
|
|
779 |
@param aPinArgs The resources required to pin any page tables.
|
|
780 |
Page table must be pinned if \a aPinArgs.iPinnedPageTables is
|
|
781 |
not the null pointer, in which case this the virtual address
|
|
782 |
of the pinned must be stored in the array this points to.
|
|
783 |
\a aPinArgs.iReadOnly is true if write access permissions
|
|
784 |
are not needed.
|
|
785 |
|
|
786 |
@param aMapping The mapping that took the page fault or is being pinned.
|
|
787 |
|
|
788 |
@param aMapInstanceCount The instance count of the mapping.
|
|
789 |
|
|
790 |
@return KErrNone if successful, otherwise one of the system wide error codes.
|
|
791 |
*/
|
|
792 |
virtual TInt PageIn(RPageArray::TIter aPages, TPinArgs& aPinArgs,
|
|
793 |
DMemoryMappingBase* aMapping, TUint aMapInstanceCount);
|
|
794 |
|
|
795 |
/**
|
|
796 |
Flush the MMUs TLB entries associated with all attached memory mappings
|
|
797 |
for a specified region of memory pages.
|
|
798 |
|
|
799 |
This is used by UnmapPages and RestrictPages.
|
|
800 |
|
|
801 |
@param aStartIndex Page index, within the memory, for start of the region.
|
|
802 |
@param aEndIndex Page index, within the memory, for the first page after
|
|
803 |
the end of the region.
|
|
804 |
*/
|
|
805 |
void FlushTLB(TUint aStartIndex, TUint aEndIndex);
|
|
806 |
|
|
807 |
|
|
808 |
/**
|
|
809 |
Get the page table being used for a specified chunk index if it exists.
|
|
810 |
|
|
811 |
@param aChunkIndex The index into #iTables of the page table.
|
|
812 |
|
|
813 |
@return The virtual address of the page table,
|
|
814 |
or the null pointer if one wasn't found.
|
|
815 |
*/
|
|
816 |
inline TPte* GetPageTable(TUint aChunkIndex)
|
|
817 |
{
|
|
818 |
__NK_ASSERT_DEBUG(MmuLock::IsHeld());
|
|
819 |
return iTables[aChunkIndex];
|
|
820 |
}
|
|
821 |
|
|
822 |
/**
|
|
823 |
Get the page table being used for a specified chunk index; allocating
|
|
824 |
a new one if it didn't previously exist.
|
|
825 |
|
|
826 |
@param aChunkIndex The index into #iTables of the page table.
|
|
827 |
|
|
828 |
@return The virtual address of the page table,
|
|
829 |
or the null pointer if one wasn't found and couldn't be allocated.
|
|
830 |
*/
|
|
831 |
TPte* GetOrAllocatePageTable(TUint aChunkIndex);
|
|
832 |
|
|
833 |
/**
|
|
834 |
Get and pin the page table being for a specified chunk index; allocating
|
|
835 |
a new one if it didn't previously exist.
|
|
836 |
|
|
837 |
@param aChunkIndex The index into #iTables of the page table.
|
|
838 |
@param aPinArgs The resources required to pin the page table.
|
|
839 |
On success, the page table will have been appended to
|
|
840 |
\a aPinArgs.iPinnedPageTables.
|
|
841 |
|
|
842 |
@return The virtual address of the page table,
|
|
843 |
or the null pointer if one wasn't found and couldn't be allocated.
|
|
844 |
*/
|
|
845 |
TPte* GetOrAllocatePageTable(TUint aChunkIndex, TPinArgs& aPinArgs);
|
|
846 |
|
|
847 |
/**
|
|
848 |
Allocate a single page table.
|
|
849 |
|
|
850 |
@param aChunkIndex The index into #iTables of the page table.
|
|
851 |
@param aDemandPaged True if the page table is for mapping demand paged memory. Most of the
|
|
852 |
time this will be determined by the #EDemandPaged bit in #iFlags.
|
|
853 |
@param aPermanent True, if the page table's permanence count is to be incremented.
|
|
854 |
|
|
855 |
@return The virtual address of the page table,
|
|
856 |
or the null pointer if one wasn't found and couldn't be allocated.
|
|
857 |
*/
|
|
858 |
TPte* AllocatePageTable(TUint aChunkIndex, TBool aDemandPaged, TBool aPermanent=false);
|
|
859 |
|
|
860 |
/**
|
|
861 |
Free a single page table if it is unused.
|
|
862 |
|
|
863 |
@param aChunkIndex The index into #iTables of the page table.
|
|
864 |
*/
|
|
865 |
void FreePageTable(TUint aChunkIndex);
|
|
866 |
|
|
867 |
/**
|
|
868 |
Allocate all the mmu page tables for this object (iTables) and ensure that
|
|
869 |
they are not freed even when they no longer map any pages.
|
|
870 |
|
|
871 |
This method increments iPermanenceCount.
|
|
872 |
|
|
873 |
This is called by DCoarseMemory::AddMapping when a memory mapping is
|
|
874 |
added with the #DMemoryMappingBase::EPermanentPageTables attribute is set.
|
|
875 |
This will also be true if the memory object has the #EReserveResources
|
|
876 |
attribute.
|
|
877 |
|
|
878 |
@pre The #MemoryObjectLock for the memory must be held by the current thread.
|
|
879 |
|
|
880 |
@return KErrNone if successful, otherwise one of the system wide error codes.
|
|
881 |
*/
|
|
882 |
TInt AllocatePermanentPageTables();
|
|
883 |
|
|
884 |
/**
|
|
885 |
Reverses the action of #AllocatePermanentPageTables.
|
|
886 |
|
|
887 |
This method decrements iPermanenceCount and if this reaches zero,
|
|
888 |
the mmu page tables for this object are freed if the are no longer in use.
|
|
889 |
*/
|
|
890 |
void FreePermanentPageTables();
|
|
891 |
|
|
892 |
/**
|
|
893 |
This is called by DCoarseMemory::AddMapping when a coarse memory mapping is
|
|
894 |
added.
|
|
895 |
|
|
896 |
@param aMapping The coarse memory mapping to add.
|
|
897 |
|
|
898 |
@return KErrNone if successful, otherwise one of the system wide error codes.
|
|
899 |
*/
|
|
900 |
TInt AddMapping(DCoarseMapping* aMapping);
|
|
901 |
|
|
902 |
/**
|
|
903 |
This is called by DCoarseMemory::RemoveMapping when a coarse memory mapping is
|
|
904 |
removed.
|
|
905 |
|
|
906 |
@param aMapping The coarse memory mapping to remove.
|
|
907 |
*/
|
|
908 |
void RemoveMapping(DCoarseMapping* aMapping);
|
|
909 |
|
|
910 |
/**
|
|
911 |
Overriding DReferenceCountedObject::Close.
|
|
912 |
This removes the linkage with #iMemory if this object is deleted.
|
|
913 |
*/
|
|
914 |
void Close();
|
|
915 |
|
|
916 |
/**
|
|
917 |
Overriding DReferenceCountedObject::AsyncClose.
|
|
918 |
This removes the linkage with #iMemory if this object is deleted.
|
|
919 |
*/
|
|
920 |
void AsyncClose();
|
|
921 |
|
|
922 |
/**
|
|
923 |
Remove an mmu page table from this object's ownership.
|
|
924 |
This is called from DCoarseMemory::StealPageTable when a RAM page containing
|
|
925 |
the page table is paged out.
|
|
926 |
|
|
927 |
@param aChunkIndex The index into #iTables of the page table.
|
|
928 |
|
|
929 |
@pre #MmuLock is held.
|
|
930 |
@pre #PageTablesLockIsHeld
|
|
931 |
*/
|
|
932 |
void StealPageTable(TUint aChunkIndex);
|
|
933 |
|
|
934 |
protected:
|
|
935 |
/**
|
|
936 |
For arguments, see #New.
|
|
937 |
*/
|
|
938 |
DPageTables(DCoarseMemory* aMemory, TInt aNumPts, TUint aPteType);
|
|
939 |
|
|
940 |
/**
|
|
941 |
Second phase constructor.
|
|
942 |
|
|
943 |
This initialises all of the mmu page tables to map the memory currently owned
|
|
944 |
by the memory object (#iMemory).
|
|
945 |
|
|
946 |
@return KErrNone if successful, otherwise one of the system wide error codes.
|
|
947 |
*/
|
|
948 |
TInt Construct();
|
|
949 |
|
|
950 |
private:
|
|
951 |
/**
|
|
952 |
Reverses the action of #AllocatePermanentPageTables for a range of page tables.
|
|
953 |
|
|
954 |
This is an implementation factor for #FreePermanentPageTables().
|
|
955 |
|
|
956 |
@param aChunkIndex The index into #iTables of the first page table.
|
|
957 |
@param aChunkCount The number of page tables.
|
|
958 |
*/
|
|
959 |
void FreePermanentPageTables(TUint aChunkIndex, TUint aChunkCount);
|
|
960 |
|
|
961 |
/**
|
|
962 |
Assign a newly allocated page table to this object.
|
|
963 |
|
|
964 |
This adds the page table to the page directory entries associated with
|
|
965 |
all mappings attached to this object.
|
|
966 |
|
|
967 |
@param aChunkIndex The index into #iTables of the page table.
|
|
968 |
@param aPageTable The page table.
|
|
969 |
|
|
970 |
@pre #PageTablesLockIsHeld.
|
|
971 |
*/
|
|
972 |
void AssignPageTable(TUint aChunkIndex, TPte* aPageTable);
|
|
973 |
|
|
974 |
/**
|
|
975 |
Unassign a page table to this object.
|
|
976 |
|
|
977 |
This removes the page table from the page directory entries associated with
|
|
978 |
all mappings attached to this object.
|
|
979 |
|
|
980 |
This is called by FreePageTable and StealPageTable.
|
|
981 |
|
|
982 |
@param aChunkIndex The index into #iTables of the page table.
|
|
983 |
|
|
984 |
@pre #PageTablesLockIsHeld.
|
|
985 |
*/
|
|
986 |
void UnassignPageTable(TUint aChunkIndex);
|
|
987 |
|
|
988 |
public:
|
|
989 |
/**
|
|
990 |
The coarse memory object which owns us.
|
|
991 |
*/
|
|
992 |
DCoarseMemory* iMemory;
|
|
993 |
|
|
994 |
/**
|
|
995 |
The #TPteType the page tables are being used for.
|
|
996 |
(This object's index in #iMemory->iPageTables.)
|
|
997 |
*/
|
|
998 |
TUint iPteType;
|
|
999 |
|
|
1000 |
/**
|
|
1001 |
The list of coarse mappings attached to this object.
|
|
1002 |
These mappings use the mmu page tables owned by us.
|
|
1003 |
*/
|
|
1004 |
TMappingList iMappings;
|
|
1005 |
|
|
1006 |
/**
|
|
1007 |
The page table entry (PTE) value for use when mapping pages into the page tables.
|
|
1008 |
This value has the physical address component being zero, so a page's physical
|
|
1009 |
address can be simply ORed in.
|
|
1010 |
*/
|
|
1011 |
TPte iBlankPte;
|
|
1012 |
|
|
1013 |
/**
|
|
1014 |
Reference count for the number of times #AllocatePermanentPageTables
|
|
1015 |
has been called without #FreePermanentPageTables.
|
|
1016 |
*/
|
|
1017 |
TUint iPermanenceCount;
|
|
1018 |
|
|
1019 |
/**
|
|
1020 |
Number of entries in #iTables.
|
|
1021 |
*/
|
|
1022 |
TUint iNumPageTables;
|
|
1023 |
|
|
1024 |
/**
|
|
1025 |
Array of page tables owned by this object. This may extend into memory
|
|
1026 |
beyond the end of this object and contains #iNumPageTables entries.
|
|
1027 |
|
|
1028 |
Each entry in the array corresponds to a #KChunkSize sized region of #iMemory.
|
|
1029 |
The null pointer indicating that no page table exists for the corresponding
|
|
1030 |
region.
|
|
1031 |
|
|
1032 |
The contents of the array are protected by the PageTableAllocator lock AND #MmuLock
|
|
1033 |
*/
|
|
1034 |
TPte* iTables[1];
|
|
1035 |
};
|
|
1036 |
|
|
1037 |
private:
|
|
1038 |
/**
|
|
1039 |
Get or allocate the page tables container for a given PTE type
|
|
1040 |
|
|
1041 |
@pre #MemoryObjectLock for this object must be held.
|
|
1042 |
*/
|
|
1043 |
DPageTables* GetOrAllocatePageTables(TUint aPteType);
|
|
1044 |
|
|
1045 |
protected:
|
|
1046 |
/**
|
|
1047 |
Array of #DPageTables objects owned by this memory object.
|
|
1048 |
Updates to this array require the #MmuLock.
|
|
1049 |
*/
|
|
1050 |
DPageTables* iPageTables[ENumPteTypes];
|
|
1051 |
|
|
1052 |
friend class DCoarseMemory::DPageTables; // for DPageTables::Close() / AsyncClose()
|
|
1053 |
};
|
|
1054 |
|
|
1055 |
|
|
1056 |
|
|
1057 |
/**
|
|
1058 |
A memory object without the special case optimisations of DCoarseMemory.
|
|
1059 |
*/
|
|
1060 |
class DFineMemory : public DMemoryObject
|
|
1061 |
{
|
|
1062 |
public:
|
|
1063 |
// from DMemoryObject...
|
|
1064 |
virtual ~DFineMemory();
|
|
1065 |
virtual TInt ClaimInitialPages(TLinAddr aBase, TUint aSize, TMappingPermissions aPermissions, TBool aAllowGaps=false, TBool aAllowNonRamPages=false);
|
|
1066 |
|
|
1067 |
public:
|
|
1068 |
/**
|
|
1069 |
Create a new DFineMemory object.
|
|
1070 |
|
|
1071 |
@param aManager The manager object for this memory.
|
|
1072 |
@param aSizeInPages Size of the memory object, in number of pages.
|
|
1073 |
@param aAttributes Bitmask of values from enum #TMemoryAttributes.
|
|
1074 |
@param aCreateFlags Bitmask of option flags from enum #TMemoryCreateFlags.
|
|
1075 |
|
|
1076 |
@return The newly created DFineMemory or the null pointer if there was
|
|
1077 |
insufficient memory.
|
|
1078 |
*/
|
|
1079 |
static DFineMemory* New(DMemoryManager* aManager, TUint aSizeInPages, TMemoryAttributes aAttributes, TMemoryCreateFlags aCreateFlags);
|
|
1080 |
|
|
1081 |
private:
|
|
1082 |
/**
|
|
1083 |
For arguments, see #New.
|
|
1084 |
*/
|
|
1085 |
DFineMemory(DMemoryManager* aManager, TUint aSizeInPages, TMemoryAttributes aAttributes, TMemoryCreateFlags aCreateFlags);
|
|
1086 |
};
|
|
1087 |
|
|
1088 |
|
|
1089 |
#endif
|