tport.cc revision 2914:2c524dc023d2 
1/*
2 * Copyright (c) 2006 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Ali Saidi
29 */
30
31#include "mem/tport.hh"
32
33void
34SimpleTimingPort::recvRetry()
35{
36    bool result = true;
37    while (result && transmitList.size()) {
38        result = Port::sendTiming(transmitList.front());
39        if (result)
40            transmitList.pop_front();
41    }
42   if (transmitList.size() == 0 && drainEvent) {
43       drainEvent->process();
44       drainEvent = NULL;
45   }
46}
47
48void
49SimpleTimingPort::SendEvent::process()
50{
51    port->outTiming--;
52    assert(port->outTiming >= 0);
53    if (port->Port::sendTiming(packet))
54       if (port->transmitList.size() == 0 && port->drainEvent) {
55           port->drainEvent->process();
56           port->drainEvent = NULL;
57       }
58       return;
59
60    port->transmitList.push_back(packet);
61}
62
63void
64SimpleTimingPort::resendNacked(Packet *pkt) {
65    pkt->reinitNacked();
66    if (transmitList.size()) {
67         transmitList.push_front(pkt);
68    } else {
69        if (!Port::sendTiming(pkt))
70            transmitList.push_front(pkt);
71    }
72};
73
74
75unsigned int
76SimpleTimingPort::drain(Event *de)
77{
78    if (outTiming == 0 && transmitList.size() == 0)
79        return 0;
80    drainEvent = de;
81    return 1;
82}
83