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/*
* Copyright (c) 2008 The Regents of The University of Michigan
* All rights reserved.
*
* 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: Gabe Black
*/
#ifndef __MEM_MPORT_HH__
#define __MEM_MPORT_HH__
#include "mem/tport.hh"
/*
* This file defines a port class which is used for sending and receiving
* messages. These messages are atomic units which don't interact and
* should be smaller than a cache block. This class is based on
* the underpinnings of SimpleTimingPort, but it tweaks some of the external
* functions.
*/
class MessagePort : public SimpleTimingPort
{
public:
MessagePort(std::string pname, MemObject *_owner = NULL) :
SimpleTimingPort(pname, _owner)
{}
virtual ~MessagePort()
{}
void
recvFunctional(PacketPtr pkt)
{
recvAtomic(pkt);
}
Tick recvAtomic(PacketPtr pkt);
virtual Tick recvMessage(PacketPtr pkt) = 0;
// Accept and ignore responses.
virtual Tick recvResponse(PacketPtr pkt)
{
return 0;
}
// Since by default we're assuming everything we send is accepted, panic.
virtual Tick recvNack(PacketPtr pkt)
{
panic("Unhandled message nack.\n");
}
void sendMessageTiming(PacketPtr pkt, Tick latency);
Tick sendMessageAtomic(PacketPtr pkt);
};
#endif
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