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/*
* Copyright (c) 2011-2012,2015,2017 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.
*
* Copyright (c) 2002-2005 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: Ron Dreslinski
* Andreas Hansson
* William Wang
*/
/**
* @file
* Port Object Declaration.
*/
#ifndef __SIM_PORT_HH__
#define __SIM_PORT_HH__
#include <string>
#include "base/types.hh"
/**
* Ports are used to interface objects to each other.
*/
class Port
{
private:
/** Descriptive name (for DPRINTF output) */
const std::string portName;
protected:
/**
* A numeric identifier to distinguish ports in a vector, and set
* to InvalidPortID in case this port is not part of a vector.
*/
const PortID id;
/**
* A pointer to this port's peer.
*/
Port *_peer;
/**
* Whether this port is currently connected to a peer port.
*/
bool _connected;
/**
* Abstract base class for ports
*
* @param _name Port name including the owners name
* @param _id A port identifier for vector ports
*/
Port(const std::string& _name, PortID _id);
/**
* Virtual destructor due to inheritance.
*/
virtual ~Port();
public:
/** Return a reference to this port's peer. */
Port &getPeer() { return *_peer; }
/** Return port name (for DPRINTF). */
const std::string name() const { return portName; }
/** Get the port id. */
PortID getId() const { return id; }
/** Attach to a peer port. */
virtual void
bind(Port &peer)
{
_peer = &peer;
_connected = true;
}
/** Dettach from a peer port. */
virtual void
unbind()
{
_peer = nullptr;
_connected = false;
}
/** Is this port currently connected to a peer? */
bool isConnected() const { return _connected; }
/** A utility function to make it easier to swap out ports. */
void
takeOverFrom(Port *old)
{
assert(old);
assert(old->isConnected());
assert(!isConnected());
Port &peer = old->getPeer();
assert(peer.isConnected());
// Disconnect the original binding.
old->unbind();
peer.unbind();
// Connect the new binding.
peer.bind(*this);
bind(peer);
}
};
#endif //__SIM_PORT_HH__
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