author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 13:38:45 +0200 | |
changeset 10 | 36bfc973b146 |
parent 9 | 96e5fb8b040d |
child 28 | 5b5d147c7838 |
permissions | -rw-r--r-- |
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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 MPTALLOC_H |
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#define MPTALLOC_H |
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#include "mcleanup.h" |
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/** |
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Number of #SPageTableInfo structures which will fit into a page of RAM. |
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*/ |
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const TUint KPageTableInfosPerPage = KPageSize/sizeof(SPageTableInfo); |
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/** |
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Number of pages of page tables which correspond to a page of page infos. |
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*/ |
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const TUint KPageTableGroupSize = KPageTableInfosPerPage/KPtClusterSize; |
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/** |
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Max number of RAM pages which can be used for page tables. |
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*/ |
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const TUint KMaxPageTablePages = (KPageTableEnd-KPageTableBase)/KPageSize; |
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/** |
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The maximum number of pages required to pin a single page table. |
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*/ |
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const TUint KNumPagesToPinOnePageTable = 2; // 1 page table page + 1 page table info page |
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/** |
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The minimum number of unpinned paged page table pages required so a page fault |
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can't fail to allocate a page table. |
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*/ |
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const TUint KMinUnpinnedPagedPtPages = KMaxCpus; |
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/** |
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Class for allocating MMU page tables. |
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*/ |
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class PageTableAllocator |
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{ |
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public: |
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void Init2(DMutex* aLock); |
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void Init2B(); |
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/** |
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Allocate a page table. |
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@param aDemandPaged True if the page table will be used to map demand paged memory; |
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false, otherwise. |
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@return Virtual address of the allocated page table, |
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or the null-pointer if there was insufficient memory. |
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@pre #PageTablesLockIsHeld, i.e. current thread has called #Lock() |
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*/ |
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TPte* Alloc(TBool aDemandPaged); |
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/** |
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Free a page table previously aquired with #Alloc. |
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@param aPageTable Virtual address of the page table, |
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@pre #PageTablesLockIsHeld, i.e. current thread has called #Lock() |
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*/ |
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void Free(TPte* aPageTable); |
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/** |
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Acquire the mutex used to protect page table allocation. |
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*/ |
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void Lock(); |
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/** |
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Release the mutex used to protect page table allocation. |
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*/ |
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void Unlock(); |
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/** |
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Return true if the current thread has acquired the mutex used to protect page table allocation. |
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I.e. has called #Lock(). |
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*/ |
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TBool LockIsHeld(); |
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/** |
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Steal a RAM page which is currently being used to store demand paged page tables |
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or page table infos. |
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This removes the page tables contained in the RAM from any objects which own |
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them and then returns the RAM to the demand paging system as a free page. This |
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will not ever return KErrNone indicating that the page has been successfully |
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stolen. |
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|
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This is only intended for use by DPageTableMemoryManager::StealPage. |
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|
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@param aPageInfo The page information structure of the page to be stolen. |
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|
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@return KErrCompletion to indicate that the page was stolen but has been |
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returned to the demand paging live list as a free page. |
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Otherwise, KErrInUse if the page was not able to be freed. |
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|
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@pre #PageTablesLockIsHeld, i.e. current thread has called #Lock() |
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@pre MmuLock held. |
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*/ |
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TInt StealPage(SPageInfo* aPageInfo); |
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|
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/** |
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Discards a page of page tables or page table infos but only if it is demand paged. |
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|
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This will only be invoked on page table info pages or pinned paged tables |
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as they aren't on the live list and so M::MovePage() will not know the pager |
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can discard them. |
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|
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@param aMemory This should always be the page table info memory object. |
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@param aOldPageInfo The page info of the page to discard. |
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@param aBlockZoneId The ID of any RAM zone not to be allocated into. |
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@param aBlockRest ETrue when any allocations should stop if blocked zone hit. |
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|
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@return KErrNone if the page could be successfully discarded and its RAM page freed. |
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*/ |
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TInt MovePage( DMemoryObject* aMemory, SPageInfo* aOldPageInfo, |
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TUint aBlockZoneId, TBool aBlockRest); |
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|
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#ifdef _DEBUG |
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/** |
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Debug function for use by DPager::RemovePage() to allow it to remove |
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pages with paged state == EUnpaged. |
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|
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A page table page may be stolen when it is unpaged as it has been |
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allocated via DMemoryMapping::AllocatePageTable() but not yet rejuvenated |
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by Mmu::PageInPages() as the MmuLock is released between these stages. |
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|
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A page table info page is never added to the live list so it will always |
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be unpaged but it can be stolen so allow it to be removed. |
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|
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@param aPageInfo The page info of the page. |
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|
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@return ETrue if the page is a page table info page, EFalse otherwise. |
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*/ |
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TBool IsPageTableUnpagedRemoveAllowed(SPageInfo* aPageInfo); |
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#endif |
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|
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/** |
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Pin the RAM page containing a page table, as well as the RAM page |
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containing its #SPageTableInfo structure. |
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|
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@param aPageTable Virtual address of the page table, |
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@param aPinArgs The resources to use for pinning. This must have |
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at least #KNumPagesToPinOnePageTable replacement |
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pages available. |
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*/ |
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TInt PinPageTable(TPte* aPageTable, TPinArgs& aPinArgs); |
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|
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/** |
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Unpin the RAM page containing a page table, as well as the RAM page |
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containing its #SPageTableInfo structure. |
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This reverses the action of #PinPageTable. |
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|
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@param aPageTable Virtual address of the page table, |
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@param aPinArgs The resources to use for pinning. The replacement |
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pages count in this will be incremented for each |
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completely unpinned, e.g. those which can be reused |
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as new replacement pages or freed. |
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*/ |
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void UnpinPageTable(TPte* aPageTable, TPinArgs& aPinArgs); |
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|
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private: |
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/** |
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Sub-allocator used for managing page tables of a given 'pagedness' (paged/not-paged). |
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Each allocator maintains a list free page tables (#iFreeList) from which it can allocate. |
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As well as a separate list of RAM pages which have no allocated page tables, #iCleanupList. |
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Page tables in the RAM on #iCleanupList do not appear in #iFreeList. |
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*/ |
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class TSubAllocator |
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{ |
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public: |
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void Init2(PageTableAllocator* iAllocator, TUint aReserveCount, TBool aDemandPaged); |
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|
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/** |
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Allocate a page table from this sub-allocator. |
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|
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@return The #SPageTableInfo structure of the page table, |
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or the null-pointer if none could be allocated. |
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*/ |
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SPageTableInfo* Alloc(); |
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|
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/** |
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Free a page table back to this sub-allocator. |
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|
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@param aPageTableInfo The #SPageTableInfo structure of the page table. |
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*/ |
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void Free(SPageTableInfo* aPageTableInfo); |
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/** |
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Add a single page of page tables to this allocator for management. |
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@param aPageTableInfo The #SPageTableInfo structure of the first page table |
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contained in the page. |
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*/ |
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void AllocPage(SPageTableInfo* aPageTableInfo); |
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/** |
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Attempt to remove a single unused page of page tables from this allocator. |
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@return The #SPageTableInfo structure of the first page table contained |
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in the removed page. Or the null-pointer if there were no unused |
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memory to be freed. |
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*/ |
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SPageTableInfo* FreePage(); |
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/** |
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Move a page of RAM containing page tables to #iCleanupList. |
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All page tables in the page must be currently unused. |
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@param aPageTableInfo The #SPageTableInfo structure of the first page table |
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contained in the page. |
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*/ |
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void MoveToCleanup(SPageTableInfo* aPageTableInfo); |
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/** |
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Return true if there are whole RAM pages which can be freed from this |
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sub-allocator without reducing #iFreeCount below #iReserveCount. |
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*/ |
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TBool IsCleanupRequired(); |
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/** |
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Debug check returning true if this objects lists are in a valid state. |
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*/ |
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TBool CheckFreeList(); |
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public: |
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SDblQue iFreeList; ///< List of unused page tables, linked by their SPageTableInfo::FreeLink. |
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SDblQue iCleanupList; ///< List of unused pages, linked by the SPageTableInfo::FreeLink of the first page table in the page. |
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TUint iFreeCount; ///< Total free page tables in pages on #iFreeList and #iCleanupList. |
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TUint iReserveCount; ///< Minimum number of page tables to keep in reserve. |
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TBool iDemandPaged; ///< True if this allocator id used for demand paged page tables. |
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}; |
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/** |
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Implementation of #Alloc. |
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*/ |
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TPte* DoAlloc(TBool aDemandPaged); |
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/** |
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Implementation of #Free. |
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*/ |
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void DoFree(TPte* aPageTable); |
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/** |
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Allocate resources for a pages worth of page tables owned by \a aSubAllocator. |
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@return True if the resources were successfully allocated. |
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@pre #PageTablesLockIsHeld, i.e. current thread has called #Lock() |
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*/ |
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TBool AllocReserve(TSubAllocator& aSubAllocator); |
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/** |
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Free the resources taken up by a pages worth of unused page tables |
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owned by \a aSubAllocator. |
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@return True, if any resources were freed. |
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False, if there are no more unused resources. |
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@pre #PageTablesLockIsHeld, i.e. current thread has called #Lock() |
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*/ |
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TBool FreeReserve(TSubAllocator& aSubAllocator); |
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/** |
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Steal a RAM page which is currently being used to store demand paged page |
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table infos. |
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This removes all the page tables references by the page table infos contained in |
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the RAM from any objects which own them and then returns the RAM to the demand |
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paging system as a free page. This will not ever return KErrNone indicating that |
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the page has been successfully stolen. |
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This is only intended for use by PageTableAllocator::StealPage. |
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@param aPageInfo The page information structure of the page to be stolen. |
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@return KErrCompletion to indicate that the page was stolen but has been |
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returned to the demand paging live list as a free page. |
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Otherwise, KErrInUse if the page was not able to be freed. |
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@pre #PageTablesLockIsHeld, i.e. current thread has called #Lock() |
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@pre MmuLock held. |
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*/ |
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TInt StealPageTableInfo(SPageInfo* aPageInfo); |
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/** |
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Free all unused resources taken up for page table management. |
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*/ |
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void Cleanup(); |
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/** |
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Trampoline function for use with iCleanup which redirects to #Cleanup(). |
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*/ |
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static void CleanupTrampoline(TAny* aSelf); |
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|
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private: |
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/** |
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Sub-allocator for allocating unpaged page tables. |
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*/ |
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TSubAllocator iUnpagedAllocator; |
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|
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/** |
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Sub-allocator for allocating demand paged page tables. |
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*/ |
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TSubAllocator iPagedAllocator; |
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|
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/** |
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Object used for queueing cleanup callbacks to #CleanupTrampoline. |
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*/ |
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TMemoryCleanup iCleanup; |
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|
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/** |
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Recursion count for #Alloc. |
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*/ |
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TUint iAllocating; |
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|
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/** |
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The mutex used to protect page table allocation. |
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*/ |
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DMutex* iLock; |
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|
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/** |
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The memory object used to store the memory containing page tables. |
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*/ |
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DMemoryObject* iPageTableMemory; |
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|
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/** |
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The memory object used to store #SPageTableInfo structures. |
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*/ |
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DMemoryObject* iPageTableInfoMemory; |
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|
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/** |
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Helper class for allocating page index values within #iPageTableMemory. |
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This wraps up to two bitmap allocators, one each used for paged and unpaged |
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page tables. |
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|
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Page indexes are allocated in a way which ensures that there will not be |
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any SPageTableInfo structures for unpaged page tables in the same RAM page |
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as the structures for paged page tables. |
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*/ |
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class TPtPageAllocator |
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{ |
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public: |
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void Init2(TUint aNumInitPages); |
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TInt Alloc(TBool aDemandPaged); |
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void Free(TUint aPageIndex, TBool aDemandPaged); |
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|
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/** |
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Determine if the page table info page is paged. |
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|
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@param aPageInfo Pointer to the SPageInfo of the page table info page. |
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@return ETrue if the page table info page is paged, EFalse otherwise. |
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@pre MmuLock is held. |
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*/ |
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inline TBool IsDemandPagedPtInfo(SPageInfo* aPageInfo) |
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{ |
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// Is the highest page table index this page table info page can reference |
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// allocated within the demand paged region of the page table address space. |
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TUint groupIndex = aPageInfo->Index(); |
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return ((groupIndex+1) * KPageTableGroupSize)-1 >= iUpperWaterMark; |
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} |
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|
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/** |
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Determine if the page table page is paged. |
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|
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@param aPageInfo Pointer to the SPageInfo of the page table info page. |
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@return ETrue if the page table page is paged, EFalse otherwise. |
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@pre MmuLock is held. |
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*/ |
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inline TBool IsDemandPagedPt(SPageInfo* aPageInfo) |
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{ |
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return aPageInfo->Index() >= iUpperWaterMark; |
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} |
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|
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/** |
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Get a random paged page table page. |
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|
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@return The index of a paged page table page. |
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@pre All paged page table pages are allocated. |
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@pre Page tables lock is held. |
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*/ |
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TUint RandomPagedPtPage(); |
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403 |
|
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404 |
/** |
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Increase the count of pinned paged page table pages. |
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|
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@return KErrNone on success, KErrNoMemory if too many pages are already pinned. |
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@pre MmuLock is held |
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*/ |
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inline TInt PtPagePinCountInc() |
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{ |
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if (AtPinnedPagedPtsLimit(iUpperWaterMark, iLowerWaterMark, iPinnedPageTablePages + 1)) |
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413 |
{ |
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return KErrNoMemory; |
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} |
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iPinnedPageTablePages++; |
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return KErrNone; |
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} |
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|
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/** |
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Decrease the count of pinned paged page table pages. |
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|
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@pre MmuLock is held |
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*/ |
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inline void PtPagePinCountDec() |
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{ |
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__NK_ASSERT_DEBUG(iPinnedPageTablePages); // Can't be zero. |
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iPinnedPageTablePages--; |
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} |
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|
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private: |
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/** |
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Check whether it is safe to pin a paged page table or reduce the amount of |
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virtual address space available to paged page tables. By checking that we |
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either have spare virtual address space to increase the amount of paged page |
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tables or that there are already enough unpinned paged page tables. |
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|
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@return ETrue if there isn't or EFalse if it is ok to pin more paged page |
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tables or increase the number of unpaged page tables. |
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*/ |
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TBool AtPinnedPagedPtsLimit(TUint aUpperWaterMark, TUint aLowerWaterMark, TUint aPinnedPtPages) |
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{ |
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TUint adjustedUpperWaterMark = aUpperWaterMark & ~(KPageTableGroupSize - 1); |
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TUint availPagedPtPages = KMaxPageTablePages - adjustedUpperWaterMark; |
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TUint availUnpinnedPagedPtPages = availPagedPtPages - aPinnedPtPages; |
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// This check is sufficient as we only increase the pinned paged page table |
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// pages or unpaged page table pages one at a time. |
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return (aLowerWaterMark + 1 == adjustedUpperWaterMark && |
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availUnpinnedPagedPtPages < KMinUnpinnedPagedPtPages); |
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} |
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|
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private: |
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TBitMapAllocator* iLowerAllocator; ///< Allocator for unpaged page tables |
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TUint iLowerWaterMark; ///< Highest page index allocated by iLowerAllocator |
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TBitMapAllocator* iUpperAllocator; ///< Allocator for demand paged page tables |
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TUint iUpperWaterMark; ///< Lowest page index allocated by iUpperAllocator |
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TUint iPinnedPageTablePages; ///< The number of pinned paged page table pages. |
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}; |
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|
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/** |
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Allocator for page indexes within #iPageTableMemory. |
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*/ |
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TPtPageAllocator iPtPageAllocator; |
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|
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/** |
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Array which contains usage for pages of #SPageTableInfo structures. |
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When the count is zero, there are no structure in use in the corresponding |
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page of memory in #iPageTableInfoMemory. Indicating that the memory may be |
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freed. |
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*/ |
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TUint16 iPageTableGroupCounts[KMaxPageTablePages/KPageTableGroupSize]; |
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|
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friend class TSubAllocator; |
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}; |
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|
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|
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/** |
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The single instance of the #PageTableAllocator. |
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*/ |
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extern PageTableAllocator PageTables; |
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|
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|
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#endif |