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/*
* Copyright (c) 2015, University of Kaiserslautern
* Copyright (c) 2016, Dresden University of Technology (TU Dresden)
* All rights reserved.
*
* 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 the copyright holder 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 HOLDER
* 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: Matthias Jung
* Christian Menard
*/
#ifndef __SC_SLAVE_PORT_HH__
#define __SC_SLAVE_PORT_HH__
#include <systemc>
#include <tlm>
#include "mem/external_slave.hh"
#include "sc_mm.hh"
#include "sc_peq.hh"
#include "sim_control.hh"
namespace Gem5SystemC
{
// forward declaration
class Gem5SlaveTransactor;
/**
* Test that gem5 is at the same time as SystemC
*/
#define CAUGHT_UP do { \
assert(curTick() == sc_core::sc_time_stamp().value()); \
} while (0)
/**
* This is a gem5 slave port that translates gem5 packets to TLM transactions.
*
* Upon receiving a packet (recvAtomic, recvTiningReq, recvFunctional) the port
* creates a new TLM payload and initializes it with information from the gem5
* packet. The original packet is added as an extension to the TLM payload.
* Then the port issues a TLM transaction in the SystemC world. By storing the
* original packet as a payload extension, the packet can be restored and send
* back to the gem5 world upon receiving a response from the SystemC world.
*/
class SCSlavePort : public ExternalSlave::Port
{
public:
/** One instance of pe and the related callback needed */
//payloadEvent<SCSlavePort> pe;
void pec(PayloadEvent<SCSlavePort> * pe,
tlm::tlm_generic_payload& trans, const tlm::tlm_phase& phase);
/**
* A transaction after BEGIN_REQ has been sent but before END_REQ, which
* is blocking the request channel (Exlusion Rule, see IEEE1666)
*/
tlm::tlm_generic_payload *blockingRequest;
/**
* Did another gem5 request arrive while currently blocked?
* This variable is needed when a retry should happen
*/
bool needToSendRequestRetry;
/**
* A response which has been asked to retry by gem5 and so is blocking
* the response channel
*/
tlm::tlm_generic_payload *blockingResponse;
protected:
/** The gem5 Port slave interface */
Tick recvAtomic(PacketPtr packet);
void recvFunctional(PacketPtr packet);
bool recvTimingReq(PacketPtr packet);
bool recvTimingSnoopResp(PacketPtr packet);
void recvRespRetry();
void recvFunctionalSnoop(PacketPtr packet);
Gem5SlaveTransactor* transactor;
public:
/** The TLM initiator interface */
tlm::tlm_sync_enum nb_transport_bw(tlm::tlm_generic_payload& trans,
tlm::tlm_phase& phase,
sc_core::sc_time& t);
SCSlavePort(const std::string &name_,
const std::string &systemc_name,
ExternalSlave &owner_);
void bindToTransactor(Gem5SlaveTransactor* transactor);
friend PayloadEvent<SCSlavePort>;
};
class SCSlavePortHandler : public ExternalSlave::Handler
{
private:
Gem5SimControl& control;
public:
SCSlavePortHandler(Gem5SimControl& control) : control(control) {}
ExternalSlave::Port *getExternalPort(const std::string &name,
ExternalSlave &owner,
const std::string &port_data);
};
}
#endif // __SC_SLAVE_PORT_H__
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