port.cc revision 12342:53a3828f2468 
1/*
2 * Copyright (c) 2012,2015,2017 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
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
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
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
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Steve Reinhardt
41 *          Andreas Hansson
42 *          William Wang
43 */
44
45/**
46 * @file
47 * Port object definitions.
48 */
49#include "mem/port.hh"
50
51#include "base/trace.hh"
52#include "mem/mem_object.hh"
53
54Port::Port(const std::string &_name, MemObject& _owner, PortID _id)
55    : portName(_name), id(_id), owner(_owner)
56{
57}
58
59Port::~Port()
60{
61}
62
63BaseMasterPort::BaseMasterPort(const std::string& name, MemObject* owner,
64                               PortID _id)
65    : Port(name, *owner, _id), _baseSlavePort(NULL)
66{
67}
68
69BaseMasterPort::~BaseMasterPort()
70{
71}
72
73BaseSlavePort&
74BaseMasterPort::getSlavePort() const
75{
76    if (_baseSlavePort == NULL)
77        panic("Cannot getSlavePort on master port %s that is not connected\n",
78              name());
79
80    return *_baseSlavePort;
81}
82
83bool
84BaseMasterPort::isConnected() const
85{
86    return _baseSlavePort != NULL;
87}
88
89BaseSlavePort::BaseSlavePort(const std::string& name, MemObject* owner,
90                             PortID _id)
91    : Port(name, *owner, _id), _baseMasterPort(NULL)
92{
93}
94
95BaseSlavePort::~BaseSlavePort()
96{
97}
98
99BaseMasterPort&
100BaseSlavePort::getMasterPort() const
101{
102    if (_baseMasterPort == NULL)
103        panic("Cannot getMasterPort on slave port %s that is not connected\n",
104              name());
105
106    return *_baseMasterPort;
107}
108
109bool
110BaseSlavePort::isConnected() const
111{
112    return _baseMasterPort != NULL;
113}
114
115/**
116 * Master port
117 */
118MasterPort::MasterPort(const std::string& name, MemObject* owner, PortID _id)
119    : BaseMasterPort(name, owner, _id), _slavePort(NULL)
120{
121}
122
123MasterPort::~MasterPort()
124{
125}
126
127void
128MasterPort::bind(BaseSlavePort& slave_port)
129{
130    // bind on the level of the base ports
131    _baseSlavePort = &slave_port;
132
133    // also attempt to base the slave to the appropriate type
134    SlavePort* cast_slave_port = dynamic_cast<SlavePort*>(&slave_port);
135
136    // if this port is compatible, then proceed with the binding
137    if (cast_slave_port != NULL) {
138        // master port keeps track of the slave port
139        _slavePort = cast_slave_port;
140        // slave port also keeps track of master port
141        _slavePort->bind(*this);
142    } else {
143        fatal("Master port %s cannot bind to %s\n", name(),
144              slave_port.name());
145    }
146}
147
148void
149MasterPort::unbind()
150{
151    if (_slavePort == NULL)
152        panic("Attempting to unbind master port %s that is not connected\n",
153              name());
154    _slavePort->unbind();
155    _slavePort = NULL;
156    _baseSlavePort = NULL;
157}
158
159AddrRangeList
160MasterPort::getAddrRanges() const
161{
162    return _slavePort->getAddrRanges();
163}
164
165Tick
166MasterPort::sendAtomic(PacketPtr pkt)
167{
168    assert(pkt->isRequest());
169    return _slavePort->recvAtomic(pkt);
170}
171
172void
173MasterPort::sendFunctional(PacketPtr pkt)
174{
175    assert(pkt->isRequest());
176    return _slavePort->recvFunctional(pkt);
177}
178
179bool
180MasterPort::sendTimingReq(PacketPtr pkt)
181{
182    assert(pkt->isRequest());
183    return _slavePort->recvTimingReq(pkt);
184}
185
186bool
187MasterPort::tryTiming(PacketPtr pkt) const
188{
189  assert(pkt->isRequest());
190  return _slavePort->tryTiming(pkt);
191}
192
193bool
194MasterPort::sendTimingSnoopResp(PacketPtr pkt)
195{
196    assert(pkt->isResponse());
197    return _slavePort->recvTimingSnoopResp(pkt);
198}
199
200void
201MasterPort::sendRetryResp()
202{
203    _slavePort->recvRespRetry();
204}
205
206void
207MasterPort::printAddr(Addr a)
208{
209    Request req(a, 1, 0, Request::funcMasterId);
210    Packet pkt(&req, MemCmd::PrintReq);
211    Packet::PrintReqState prs(std::cerr);
212    pkt.senderState = &prs;
213
214    sendFunctional(&pkt);
215}
216
217/**
218 * Slave port
219 */
220SlavePort::SlavePort(const std::string& name, MemObject* owner, PortID id)
221    : BaseSlavePort(name, owner, id), _masterPort(NULL)
222{
223}
224
225SlavePort::~SlavePort()
226{
227}
228
229void
230SlavePort::unbind()
231{
232    _baseMasterPort = NULL;
233    _masterPort = NULL;
234}
235
236void
237SlavePort::bind(MasterPort& master_port)
238{
239    _baseMasterPort = &master_port;
240    _masterPort = &master_port;
241}
242
243Tick
244SlavePort::sendAtomicSnoop(PacketPtr pkt)
245{
246    assert(pkt->isRequest());
247    return _masterPort->recvAtomicSnoop(pkt);
248}
249
250void
251SlavePort::sendFunctionalSnoop(PacketPtr pkt)
252{
253    assert(pkt->isRequest());
254    return _masterPort->recvFunctionalSnoop(pkt);
255}
256
257bool
258SlavePort::sendTimingResp(PacketPtr pkt)
259{
260    assert(pkt->isResponse());
261    return _masterPort->recvTimingResp(pkt);
262}
263
264void
265SlavePort::sendTimingSnoopReq(PacketPtr pkt)
266{
267    assert(pkt->isRequest());
268    _masterPort->recvTimingSnoopReq(pkt);
269}
270
271void
272SlavePort::sendRetryReq()
273{
274    _masterPort->recvReqRetry();
275}
276
277void
278SlavePort::sendRetrySnoopResp()
279{
280    _masterPort->recvRetrySnoopResp();
281}
282