bbb3abc167
The Packet::get() and Packet::set() methods both have very strange semantics. Currently, they automatically convert between the guest system's endianness and the host system's endianness. This behavior is usually undesired and unexpected. This patch introduces three new method pairs to access data: * getLE() / setLE() - Get data stored as little endian. * getBE() / setBE() - Get data stored as big endian. * get(ByteOrder) / set(v, ByteOrder) - Configurable endianness For example, a little endian device that is receiving a write request will use teh getLE() method to get the data from the packet. The old interface will be deprecated once all existing devices have been ported to the new interface.
148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
/*
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* Copyright (c) 2015 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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* Nathan Binkert
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* Andreas Sandberg
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*/
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#include "arch/isa_traits.hh"
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#include "base/bigint.hh"
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#include "config/the_isa.hh"
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#include "mem/packet.hh"
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#include "sim/byteswap.hh"
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#ifndef __MEM_PACKET_ACCESS_HH__
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#define __MEM_PACKET_ACCESS_HH__
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template <typename T>
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inline T
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Packet::getRaw() const
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{
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assert(flags.isSet(STATIC_DATA|DYNAMIC_DATA));
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assert(sizeof(T) <= size);
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return *(T*)data;
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}
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template <typename T>
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inline void
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Packet::setRaw(T v)
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{
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assert(flags.isSet(STATIC_DATA|DYNAMIC_DATA));
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assert(sizeof(T) <= size);
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*(T*)data = TheISA::htog(v);
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}
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template <typename T>
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inline T
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Packet::getBE() const
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{
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return betoh(getRaw<T>());
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}
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template <typename T>
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inline T
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Packet::getLE() const
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{
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return letoh(getRaw<T>());
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}
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template <typename T>
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inline T
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Packet::get(ByteOrder endian) const
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{
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switch (endian) {
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case BigEndianByteOrder:
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return getBE<T>();
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case LittleEndianByteOrder:
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return getLE<T>();
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default:
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panic("Illegal byte order in Packet::get()\n");
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};
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}
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template <typename T>
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inline T
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Packet::get() const
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{
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return TheISA::gtoh(getRaw<T>());
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}
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template <typename T>
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inline void
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Packet::setBE(T v)
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{
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setRaw(htobe(v));
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}
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template <typename T>
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inline void
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Packet::setLE(T v)
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{
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setRaw(htole(v));
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}
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template <typename T>
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inline void
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Packet::set(T v, ByteOrder endian)
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{
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switch (endian) {
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case BigEndianByteOrder:
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return setBE<T>(v);
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case LittleEndianByteOrder:
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return setLE<T>(v);
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default:
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panic("Illegal byte order in Packet::set()\n");
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};
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}
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template <typename T>
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inline void
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Packet::set(T v)
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{
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setRaw(TheISA::htog(v));
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}
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#endif //__MEM_PACKET_ACCESS_HH__
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