| /* |
| * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies) |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef PageAllocatorSymbian_h |
| #define PageAllocatorSymbian_h |
| |
| #include <e32std.h> |
| #include <wtf/Bitmap.h> |
| |
| namespace WTF { |
| |
| size_t pageSize(); |
| |
| // Convenience wrapper around an RChunk |
| class SymbianChunk : public RChunk { |
| |
| public: |
| SymbianChunk(TInt handle) |
| { |
| SetHandle(handle); |
| // prevent kernel calls by caching these |
| m_base = reinterpret_cast<char*>(Base()); |
| m_maxSize = MaxSize(); |
| } |
| |
| ~SymbianChunk() |
| { |
| Decommit(0, m_maxSize); |
| Close(); |
| } |
| |
| // checks if address is in chunk's virtual address space |
| bool contains(const void* address) const |
| { |
| return (static_cast<const char*>(address) >= m_base && static_cast<const char*>(address) < (m_base + m_maxSize)); |
| } |
| |
| char* m_base; |
| size_t m_maxSize; |
| |
| }; |
| |
| // Size of the large up-front reservation |
| #if defined(__WINS__) |
| // Emulator has limited virtual address space |
| const size_t largeReservationSize = 96*1024*1024; |
| #else |
| // HW has plenty of virtual addresses |
| const size_t largeReservationSize = 256*1024*1024; |
| #endif |
| |
| class PageAllocatorSymbian { |
| |
| public: |
| PageAllocatorSymbian(); |
| ~PageAllocatorSymbian(); |
| |
| void* reserve(size_t); |
| void release(void*, size_t); |
| bool commit(void*, size_t); |
| bool decommit(void*, size_t); |
| |
| bool contains(const void*) const; |
| |
| private: |
| static const size_t m_pageSize = 4096; |
| SymbianChunk* m_chunk; |
| Bitmap<largeReservationSize / m_pageSize> m_map; |
| |
| }; |
| |
| } // namespace WTF |
| |
| #endif // PageAllocatorSymbian_h |
| |