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/*
* Copyright (c) 2011-2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* 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;
* neither the name of the copyright holders 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*
* Authors: Andreas Hansson
*/
/**
* @file
* PortProxy Object Declaration.
*
* Port proxies are used when non-structural entities need access to
* the memory system (or structural entities that want to peak into
* the memory system without making a real memory access).
*
* Proxy objects replace the previous FunctionalPort, TranslatingPort
* and VirtualPort objects, which provided the same functionality as
* the proxies, but were instances of ports not corresponding to real
* structural ports of the simulated system. Via the port proxies all
* the accesses go through an actual port (either the system port,
* e.g. for processes or initialisation, or a the data port of the
* CPU, e.g. for threads) and thus are transparent to a potentially
* distributed memory and automatically adhere to the memory map of
* the system.
*/
#ifndef __MEM_PORT_PROXY_HH__
#define __MEM_PORT_PROXY_HH__
#include "config/the_isa.hh"
#if THE_ISA != NO_ISA
#include "arch/isa_traits.hh"
#endif
#include "mem/port.hh"
#include "sim/byteswap.hh"
/**
* This object is a proxy for a structural port, to be used for debug
* accesses.
*
* This proxy object is used when non structural entities
* (e.g. thread contexts, object file loaders) need access to the
* memory system. It calls the corresponding functions on the underlying
* structural port, and provides templatized convenience access functions.
*
* The addresses are interpreted as physical addresses.
*
* @sa SETranslatingProxy
* @sa FSTranslatingProxy
*/
class PortProxy
{
private:
/** The actual physical port used by this proxy. */
Port &_port;
void blobHelper(Addr addr, uint8_t *p, int size, MemCmd cmd) const;
public:
PortProxy(Port &port) : _port(port) { }
virtual ~PortProxy() { }
/**
* Read size bytes memory at address and store in p.
*/
virtual void readBlob(Addr addr, uint8_t* p, int size) const
{ blobHelper(addr, p, size, MemCmd::ReadReq); }
/**
* Write size bytes from p to address.
*/
virtual void writeBlob(Addr addr, uint8_t* p, int size) const
{ blobHelper(addr, p, size, MemCmd::WriteReq); }
/**
* Fill size bytes starting at addr with byte value val.
*/
virtual void memsetBlob(Addr addr, uint8_t v, int size) const;
/**
* Read sizeof(T) bytes from address and return as object T.
*/
template <typename T>
T read(Addr address) const;
/**
* Write object T to address. Writes sizeof(T) bytes.
*/
template <typename T>
void write(Addr address, T data) const;
#if THE_ISA != NO_ISA
/**
* Read sizeof(T) bytes from address and return as object T.
* Performs Guest to Host endianness transform.
*/
template <typename T>
T readGtoH(Addr address) const;
/**
* Write object T to address. Writes sizeof(T) bytes.
* Performs Host to Guest endianness transform.
*/
template <typename T>
void writeHtoG(Addr address, T data) const;
#endif
};
template <typename T>
T
PortProxy::read(Addr address) const
{
T data;
readBlob(address, (uint8_t*)&data, sizeof(T));
return data;
}
template <typename T>
void
PortProxy::write(Addr address, T data) const
{
writeBlob(address, (uint8_t*)&data, sizeof(T));
}
#if THE_ISA != NO_ISA
template <typename T>
T
PortProxy::readGtoH(Addr address) const
{
T data;
readBlob(address, (uint8_t*)&data, sizeof(T));
return TheISA::gtoh(data);
}
template <typename T>
void
PortProxy::writeHtoG(Addr address, T data) const
{
data = TheISA::htog(data);
writeBlob(address, (uint8_t*)&data, sizeof(T));
}
#endif
#endif // __MEM_PORT_PROXY_HH__
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