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 |
permissions | -rw-r--r-- |
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// Copyright (c) 2006-2009 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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// e32\include\memmodel\epoc\mmubase\kblockmap.h |
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// Kernel-side functionality for processing block maps |
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// |
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// WARNING: This file contains some APIs which are internal and are subject |
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// to change without notice. Such APIs should therefore not be used |
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// outside the Kernel and Hardware Services package. |
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// |
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#ifndef __KBLOCKMAP_H__ |
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#define __KBLOCKMAP_H__ |
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#include <e32ldr.h> |
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#include <e32ldr_private.h> |
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/** |
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The kernel-side representation of a block map. |
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*/ |
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class TBlockMap |
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{ |
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public: |
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TBlockMap(); |
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~TBlockMap(); |
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/** |
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Initialise and populate kernel-side representation from a user-side block map |
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@param aBlockMapInfo The user-side block map info structure. |
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@param aBlockMapEntries Pointer to a buffer containg the user-side block map entries. |
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This object takes ownership of the buffer. |
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@param aBlockMapEntriesSize The size of the user-side block map entries in bytes. |
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@param aReadUnitShift Log2 of the paging device's read unit size. |
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@param aDataLengthInFile The length of the (possibly compressed) code in the file. |
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*/ |
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TInt Initialise(const SBlockMapInfoBase& aBlockMapInfo, |
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TBlockMapEntryBase* aBlockMapEntries, |
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TInt aBlockMapEntriesSize, |
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TInt aReadUnitShift, |
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TInt aDataLengthInFile); |
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/** |
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A function supplied to Read that is called to read the actual data. |
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@param aArg1 An argument parameter passed to read. |
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@param aArg2 Another argument parameter passed to read. |
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@param aBuffer The address of the buffer to read the data into. |
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@param aBlockNumber The block number to read. |
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@param aBlockCount The number of blocks to read. |
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*/ |
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typedef TInt (*TReadFunc)(TAny* aArg1, TAny* aArg2, TLinAddr aBuffer, TInt aBlockNumber, TInt aBlockCount); |
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/** |
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Read data from the file described by the block map into a buffer. |
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@param aBuffer The buffer into which to read the data. |
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@param aPos The offset from the start of the data at which to read. |
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@param aLength The length of data to read in bytes. |
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@param aReadUnitShift Log2 of the paging device's read unit size. |
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@param aReadFunc The function to call to read the blocks of data. |
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@param aArg1 An argument parameter passed to read. |
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@param aArg2 Another argument parameter passed to read. |
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@return The offset into the buffer at which the data starts, or one of the system-wide error |
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codes. |
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*/ |
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TInt Read(TLinAddr aBuffer, TInt aPos, TInt aLength, TInt aReadUnitShift, TReadFunc aReadFunc, TAny* aArg1, TAny* aArg2) const; |
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/** |
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A contiguous area of media containing (possibly compressed) code. |
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*/ |
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struct SExtent |
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{ |
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TInt iDataOffset; // position in file from, counting from start of code data |
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TUint iBlockNumber; // block number containg this position |
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}; |
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inline TInt Count() const; |
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inline const SExtent& Extent(TInt aIndex) const; |
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inline TInt DataLength() const; |
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/** |
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Print out the contents of this object for debugging purposes. |
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This method is only implemented in debug builds. |
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*/ |
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void Dump() const; |
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private: |
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TInt FindFirstExtent(TInt aPos) const; |
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TInt iDataLength; |
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TInt iExtentCount; |
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SExtent* iExtents; |
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}; |
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inline TInt TBlockMap::Count() const |
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{ |
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return iExtentCount; |
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} |
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inline const TBlockMap::SExtent& TBlockMap::Extent(TInt aIndex) const |
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{ |
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return iExtents[aIndex]; |
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} |
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inline TInt TBlockMap::DataLength() const |
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{ |
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return iDataLength; |
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} |
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#endif |