175 lines
5.3 KiB
C++
175 lines
5.3 KiB
C++
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/*
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* Copyright (c) 2011 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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* 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: Andreas Hansson
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*/
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/**
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* @file
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* PortProxy Object Declaration.
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*
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* Port proxies are used when non structural entities need access to
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* the memory system. Proxy objects replace the previous
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* FunctionalPort, TranslatingPort and VirtualPort objects, which
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* provided the same functionality as the proxies, but were instances
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* of ports not corresponding to real structural ports of the
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* simulated system. Via the port proxies all the accesses go through
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* an actual port and thus are transparent to a potentially
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* distributed memory and automatically adhere to the memory map of
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* the system.
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*/
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#ifndef __MEM_PORT_PROXY_HH__
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#define __MEM_PORT_PROXY_HH__
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#include "config/the_isa.hh"
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#if THE_ISA != NO_ISA
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#include "arch/isa_traits.hh"
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#endif
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#include "base/types.hh"
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#include "mem/port.hh"
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#include "sim/byteswap.hh"
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/**
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* This object is a proxy for a structural port,
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* to be used for debug accesses.
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*
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* This proxy object is used when non structural entities
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* (e.g. thread contexts, object file loaders) need access to the
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* memory system. It calls the corresponding functions on the underlying
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* structural port, and provides templatized convenience access functions.
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*
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* The addresses are interpreted as physical addresses.
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*
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* @sa SETranslatingProxy
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* @sa FSTranslatingProxy
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*/
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class PortProxy
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{
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protected:
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Port &_port;
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public:
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PortProxy(Port &port) : _port(port) { }
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virtual ~PortProxy() { }
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public:
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/**
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* Read size bytes memory at address and store in p.
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*/
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virtual void readBlob(Addr address, uint8_t* p, int size)
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{ _port.readBlob(address, p, size); }
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/**
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* Write size bytes from p to address.
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*/
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virtual void writeBlob(Addr address, uint8_t* p, int size)
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{ _port.writeBlob(address, p, size); }
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/**
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* Fill size bytes starting at addr with byte value val.
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*/
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virtual void memsetBlob(Addr address, uint8_t v, int size)
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{ _port.memsetBlob(address, v, size); }
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/**
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* Read sizeof(T) bytes from address and return as object T.
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*/
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template <typename T>
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T read(Addr address);
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/**
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* Write object T to address. Writes sizeof(T) bytes.
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*/
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template <typename T>
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void write(Addr address, T data);
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#if THE_ISA != NO_ISA
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/**
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* Read sizeof(T) bytes from address and return as object T.
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* Performs Guest to Host endianness transform.
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*/
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template <typename T>
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T readGtoH(Addr address);
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/**
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* Write object T to address. Writes sizeof(T) bytes.
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* Performs Host to Guest endianness transform.
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*/
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template <typename T>
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void writeHtoG(Addr address, T data);
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#endif
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};
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template <typename T>
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T
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PortProxy::read(Addr address)
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{
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T data;
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readBlob(address, (uint8_t*)&data, sizeof(T));
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return data;
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}
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template <typename T>
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void
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PortProxy::write(Addr address, T data)
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{
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writeBlob(address, (uint8_t*)&data, sizeof(T));
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}
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#if THE_ISA != NO_ISA
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template <typename T>
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T
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PortProxy::readGtoH(Addr address)
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{
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T data;
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readBlob(address, (uint8_t*)&data, sizeof(T));
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return TheISA::gtoh(data);
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}
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template <typename T>
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void
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PortProxy::writeHtoG(Addr address, T data)
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{
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data = TheISA::htog(data);
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writeBlob(address, (uint8_t*)&data, sizeof(T));
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}
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#endif
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#endif // __MEM_PORT_PROXY_HH__
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