2 * Copyright (c) 2011-2012,2015,2017 ARM Limited
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8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
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12 * modified or unmodified, in source code or in binary form.
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
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18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
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26 * this software without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 * Authors: Ron Dreslinski
47 * Port Object Declaration.
50 #ifndef __SIM_PORT_HH__
51 #define __SIM_PORT_HH__
55 #include "base/types.hh"
58 * Ports are used to interface objects to each other.
65 /** Descriptive name (for DPRINTF output) */
66 const std::string portName;
71 * A numeric identifier to distinguish ports in a vector, and set
72 * to InvalidPortID in case this port is not part of a vector.
77 * A pointer to this port's peer.
83 * Whether this port is currently connected to a peer port.
88 * Abstract base class for ports
90 * @param _name Port name including the owners name
91 * @param _id A port identifier for vector ports
93 Port(const std::string& _name, PortID _id);
96 * Virtual destructor due to inheritance.
102 /** Return a reference to this port's peer. */
103 Port &getPeer() { return *_peer; }
105 /** Return port name (for DPRINTF). */
106 const std::string name() const { return portName; }
108 /** Get the port id. */
109 PortID getId() const { return id; }
111 /** Attach to a peer port. */
119 /** Dettach from a peer port. */
127 /** Is this port currently connected to a peer? */
128 bool isConnected() const { return _connected; }
130 /** A utility function to make it easier to swap out ports. */
132 takeOverFrom(Port *old)
135 assert(old->isConnected());
136 assert(!isConnected());
137 Port &peer = old->getPeer();
138 assert(peer.isConnected());
140 // Disconnect the original binding.
144 // Connect the new binding.
150 static inline std::ostream &
151 operator << (std::ostream &os, const Port &port)
157 #endif //__SIM_PORT_HH__