src/mem/tport.cc

   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
  33 void
  34 SimpleTimingPort::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
  48 void
  49 SimpleTimingPort::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
  63 void
  64 SimpleTimingPort::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
  75 unsigned int
  76 SimpleTimingPort::drain(Event *de)
  77 {
  78     if (outTiming == 0 && transmitList.size() == 0)
  79         return 0;
  80     drainEvent = de;
  81     return 1;
  82 }