author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 26 Jan 2010 13:13:38 +0200 | |
changeset 47 | 46fffbe7b5a7 |
parent 43 | 96e5fb8b040d |
child 148 | 31ea0f8e3c99 |
permissions | -rw-r--r-- |
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// Copyright (c) 1998-2009 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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// eka\include\kernel\cache.h |
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// |
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// |
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/** |
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@file |
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@publishedPartner |
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@released |
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*/ |
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#ifndef __CACHE_H__ |
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#define __CACHE_H__ |
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#include <e32err.h> |
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#include <nk_cpu.h> |
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/** |
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Cache Thresholds container used to Set/Get cache thresholds from/to Kernel. |
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@see Cache::GetThresholds |
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@see Cache::SetThresholds |
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*/ |
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struct TCacheThresholds |
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{ |
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TUint32 iPurge; /**< Invalidate threshold in bytes*/ |
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TUint32 iClean; /**< Clean threshold in bytes*/ |
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TUint32 iFlush; /**< Clean and invalidate threshold in bytes*/ |
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}; |
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|
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const TUint KCacheSelectI=1; /**<Specifies instruction cache.*/ |
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const TUint KCacheSelectD=2; /**<Specifies data cache to the point of coherency.*/ |
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const TUint KCacheSelectAltD=4; /**<Specifies alternative cache. @deprecated*/ |
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const TUint KCacheSelectD_IMB=8; /**<Specifies data cache to the point of unification.*/ |
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const TUint KCacheSelect_L2=0x10; /**<Specifies external cache.*/ |
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|
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/** |
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A set of Kernel APIs for cache utility functions. |
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*/ |
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class Cache |
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{ |
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public: |
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/** |
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Synchronises cache(s) for instruction execution in the specified address range. |
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The function performs the cache/memory synchronisation required to guarantee |
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correct execution of code in the specified virtual address range. |
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@param aBase The start of the virtual address range. |
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@param aSize The size of the address range. |
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@pre Call in a thread context. |
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@pre No fast mutex can be held. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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*/ |
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IMPORT_C static void IMB_Range(TLinAddr aBase, TUint aSize); |
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/** |
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Synchronises cache(s) prior to a DMA write (memory to HW DMA transfer) operation. |
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It is assumed that the memory region is fully cached. |
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The purpose of SyncMemoryBeforeDmaWrite is to ensure that the main memory is |
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synchronised with the content of cache memory before the start of DMA write transfer. |
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@param aBase The start of the virtual address range. |
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@param aSize The size of the address range. |
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@pre Call in a thread context. |
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@pre No fast mutex can be held. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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*/ |
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IMPORT_C static void SyncMemoryBeforeDmaWrite(TLinAddr aBase, TUint aSize); |
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/** |
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Synchronises cache(s) prior to a DMA read (HW to memory DMA transfer) operation. |
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It is assumed that the memory region is fully cached. |
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|
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The purpose of SyncMemoryBeforeDmaRead is to make sure that the content of memory |
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(that is about to be DMA-ed) won't be destroyed by interaction between cache |
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and the main memory. (E.g. by cache eviction or remaining content of write buffers.) |
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@param aBase The start of the virtual address range. |
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@param aSize The size of the address range. |
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@pre Call in a thread context. |
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@pre No fast mutex can be held. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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*/ |
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IMPORT_C static void SyncMemoryBeforeDmaRead(TLinAddr aBase, TUint aSize); |
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/** |
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Synchronises cache(s) after a DMA read (HW to memory DMA transfer) operation. |
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It is assumed that the memory region is fully cached. |
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The purpose of SyncMemoryAfterDmaRead is to make sure that CPU won't read |
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old data from cache instead of DMA-ed data from the main memory. |
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@param aBase The start of the virtual address range. |
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@param aSize The size of the address range. |
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@pre Call in a thread context. |
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@pre No fast mutex can be held. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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*/ |
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IMPORT_C static void SyncMemoryAfterDmaRead(TLinAddr aBase, TUint aSize); |
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/** |
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Synchronises cache(s) with main memory prior to power off or reboot. |
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It ensures the content of cache is copied down to the main memory. It doesn't necessarily |
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invalidates the content of cache(s). |
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On SMP platforms, it only maintains internal cache of the CPU that executes the call. |
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Cache memory common to the all cores (like external cache controllers) are also synchronised. |
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@pre Interrupts must be disabled. |
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*/ |
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IMPORT_C static void AtomicSyncMemory(); |
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/** |
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Synchronises cache(s) prior to a DMA write (memory to HW DMA transfer) operation. |
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The purpose of SyncMemoryBeforeDmaWrite is to make sure that the main memory is synchronised |
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with the content of cache memory before DMA transfer from main memory starts. |
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@param aBase The start of the virtual address range. |
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@param aSize The size of the address range. |
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@param aMapAttr The mapping attributes with which the address range has been mapped. |
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This is a value constructed from the bit masks in the enumeration |
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TMappingAttributes. |
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@pre Call in a thread context. |
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@pre No fast mutex can be held. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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@see TMappingAttributes |
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*/ |
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IMPORT_C static void SyncMemoryBeforeDmaWrite(TLinAddr aBase, TUint aSize, TUint32 aMapAttr); |
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/** |
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Synchronises cache(s) prior to a DMA read ((HW to memory DMA transfer) operation. |
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|
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The purpose of SyncMemoryBeforeDmaRead is to make sure that the content of memory |
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(that is about to be DMA-ed) won't be destroyed by interaction between cache |
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and the main memory. (E.g. by write buffers' flushing or cache eviction.) |
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|
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@param aBase The start of the virtual address range. |
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@param aSize The size of the address range. |
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|
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@param aMapAttr The mapping attributes with which the address range has been mapped. |
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This is a value constructed from the bit masks in the enumeration |
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TMappingAttributes. |
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@pre Call in a thread context. |
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@pre No fast mutex can be held. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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@see TMappingAttributes |
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*/ |
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IMPORT_C static void SyncMemoryBeforeDmaRead(TLinAddr aBase, TUint aSize, TUint32 aMapAttr); |
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/** |
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Synchronises cache(s) after a DMA read (HW to memory DMA transfer) operation. |
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|
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The purpose of SyncMemoryAfterDmaRead is to make sure that CPU won't read |
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old data from cache instead of DMA-ed data from the main memory. |
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|
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@param aBase The start of the virtual address range. |
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@param aSize The size of the address range. |
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@param aMapAttr The mapping attributes with which the address range has been mapped. |
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This is a value constructed from the bit masks in the enumeration |
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TMappingAttributes. |
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@pre Call in a thread context. |
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@pre No fast mutex can be held. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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@see TMappingAttributes |
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*/ |
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IMPORT_C static void SyncMemoryAfterDmaRead(TLinAddr aBase, TUint aSize, TUint32 aMapAttr); |
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/** |
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Prepares physical memory for DMA writing (memory to H/W DMA copy). If the physical memory is the |
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subject of RAM defragmentation framework (e.g. if it is mapped in user side space) the driver |
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should make sure it is pinned (@see Kern::PinPhysicalMemory) before calling this Kernel service. |
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Kern::PinPhysicalMemory also generates input parameters aPages and aColour for this Kernel service. |
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@param aPages Pointer to the the list of physical memory pages to be prepared for DMA write. |
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The exact portion of physical memory to be prepared is defined by aOffset and |
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aSize parameters. For example, if aOffset is 0x1800 and aSize is 0x2000, the method |
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will sync the last 0x800 bytes of the second page in the list, the whole third page |
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and the first 0x800 bytes of the fourth page. (0x1000 page size is assumed). |
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@param aColour The mapping colour of the first physical page in the list. |
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@param aOffset Offset in memory list where DMA transfer should start. |
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@param aSize The size of the memory in bytes to be sync'ed. |
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@param aMapAttr Mapping attributes of the the existing mapping. The value is either: |
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- Formed by ORing together values from the TMappingAttributes enumeration as |
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returned by Kern::ChunkCreate interface, or |
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- TMappingAttributes2 object. |
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For user memory (always fully cached), EMapAttrCachedMax enum value can be passed. |
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|
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@return KErrNotSupported on memory models other than flexible. |
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KErrNone, on flexible memory model. |
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@pre Interrupts must be enabled. |
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@pre Kernel must be unlocked. |
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@pre No fast mutex can be held. |
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@pre Call in a thread context. |
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@pre Can be used in a device driver. |
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*/ |
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IMPORT_C static TInt SyncPhysicalMemoryBeforeDmaWrite(TPhysAddr* aPages, TUint aColour, TUint aOffset, TUint aSize, TUint32 aMapAttr); |
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|
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/** |
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Prepares physical memory for DMA read (H/W to memory DMA copy). |
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For all the details @see Cache::SyncPhysicalMemoryBeforeDmaWrite |
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*/ |
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IMPORT_C static TInt SyncPhysicalMemoryBeforeDmaRead (TPhysAddr* aPages, TUint aColour, TUint aOffset, TUint aSize, TUint32 aMapAttr); |
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|
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/** |
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Maintains physical memory after DMA read (H/W to memory DMA copy). |
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For all the details @see Cache::SyncPhysicalMemoryBeforeDmaWrite |
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*/ |
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IMPORT_C static TInt SyncPhysicalMemoryAfterDmaRead (TPhysAddr* aPages, TUint aColour, TUint aOffset, TUint aSize, TUint32 aMapAttr); |
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|
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/* |
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* Gets threshold values for the specified cache. |
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* |
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* When Kernel is about to perform cache maintenance operation, the size of the region to act |
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* against is compared to the corresponding threshold value: |
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* - When invalidating memory region: |
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* @code |
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* if (invalidate region > invalidate threshold) |
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* clean and invalidate entire cache |
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* else |
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* invalidate the specified region |
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* @endcode |
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* |
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* - When cleaning memory region: |
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* @code |
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* if (clean region > clean threshold) |
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* clean entire cache |
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* else |
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* clean the specified region |
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* @endcode |
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* |
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* - When invalidating and cleaning memory region: |
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* @code |
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* if (invalidate and clean region > invalidate and clean threshold) |
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* invalidate and clean entire cache |
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* else |
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* invalidate and clean the specified region |
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* @endcode |
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* |
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* This function returns the current threshold values for the specified type of cache. Threshold |
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* values could be changed by Cache::SetThresholds. |
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* |
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* @param aCacheType Specifies which type of cache the thresholds belong to: |
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* - KCacheSelectI Instruction Cache |
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* - KCacheSelectD Data Cache. For ARMv7 platforms, it specifies Point-of-Coherency thresholds. |
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* These threshold are relevant for DMA related cache maintenance. |
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* - KCacheSelectD_IMB Data Cache for the Point-of-Unification. |
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* These threshold are relevant for Instruction Memory Barrier (IMB). |
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* - KCacheSelectAltD Alternative Data Cache. This type of cache is depricated on today's platforms. |
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* - KCacheSelect_L2 External Cache, such as L210, L220 or PL310. |
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* @param aThresholds If KErrNone is returned, holds thresholds values(in bytes) for the specified cache. |
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* |
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* @return KErrNone if successfull or KErrNotSupported if aCacheType is not valid on the |
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* running platform. |
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* |
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* @see Cache::SetThresholds |
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* @see TCacheThresholds |
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* @released 9.3 |
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*/ |
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IMPORT_C static TInt GetThresholds(TCacheThresholds& aThresholds, TUint aCacheType); |
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|
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/* |
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* Sets threshold values for the specified cache. @See GetThresholds for details. |
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* |
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* @param aCacheType Specifies which type of cache the thresholds belong to: |
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* - KCacheSelectI Instruction Cache |
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* - KCacheSelectD Data Cache. For ARMv7 platforms, it specifies Point-of-Coherency thresholds. |
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* These threshold are relevant for DMA related cache maintenance. |
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* - KCacheSelectD_IMB Data Cache for the Point-of-Unification. |
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* These threshold are relevant for Instruction Memory Barrier (IMB). |
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* - KCacheSelectAltD Alternative Data Cache. This type of cache is depricated on today's platforms. |
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* - KCacheSelect_L2 External Cache, such as L210, L220 or PL310. |
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* @param aThresholds New threshold values (in bytes) for the cache.. |
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* |
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* @return KErrNone if successfull or KErrNotSupported if aCacheType is not valid on the |
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* running platform. |
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* |
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* @see Cache::GetThresholds |
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* @see TCacheThresholds |
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* @released 9.3 |
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*/ |
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IMPORT_C static TInt SetThresholds(const TCacheThresholds& aThresholds, TUint aCacheType); |
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|
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/* |
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* Returns the required alignment for fully cached memory buffer used in DMA transfer. |
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* Use this value to separate DMA from non-DMA memory. |
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* |
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* Note that a single DMA transfer can still start/stop from any memory location. However, |
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* the content of memory just before (if start address is unaligned) or after (if end address |
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* is unaligned) DMA buffer may be corrupted. |
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* |
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* Here is an example of code that allocates DMA buffer from the heap. |
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* |
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* @code |
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* class DMABufferAlloc |
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* { |
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* public: |
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* DMABufferAlloc():iPtr(NULL){}; |
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* |
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* //Return value is guaranteed to be aligned. |
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* TAny* Alloc(TInt aSize) |
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* { |
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* TInt alignmentMask = Cache::DmaBufferAlignment()-1; |
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* NKern::ThreadEnterCS(); |
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* |
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* // Assume that the return value of Kern::Alloc is unaligned. |
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* // Allocate sufficient memory to cover the worst case, for example: |
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* // Alignment = 32, aSize = 2. If (iPtr==31) 64 bytes are required |
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* iPtr = Kern::Alloc( (aSize+2*alignmentMask) & ~alignmentMask); |
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* |
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* NKern::ThreadLeaveCS(); |
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* |
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* //Return the first aligned location in the allocated buffer. |
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* return (TAny*)(((TInt)iPtr + alignmentMask) & ~alignmentMask); |
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* } |
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* |
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* void Free() |
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* { |
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* NKern::ThreadEnterCS(); |
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* Kern::Free(iPtr); |
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* iPtr = NULL; |
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* NKern::ThreadLeaveCS(); |
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* } |
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* |
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* ~DMABufferAlloc() |
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* { |
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* if (iPtr) |
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* Free(); |
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* }; |
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* |
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* private: |
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* TAny* iPtr; |
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* }; |
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* @codeend |
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*/ |
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IMPORT_C static TUint DmaBufferAlignment(); |
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}; |
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|
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#endif // def __CACHE_H__ |