f9ae0dcf10
allowing derived classes to be simplified. --HG-- extra : convert_revision : c980d3aec5e6c044d8f41e96252726fe9a256605
98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* Copyright (c) 2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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*/
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#include "mem/tport.hh"
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void
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SimpleTimingPort::recvFunctional(Packet *pkt)
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{
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// just do an atomic access and throw away the returned latency
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recvAtomic(pkt);
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}
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bool
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SimpleTimingPort::recvTiming(Packet *pkt)
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{
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// If the device is only a slave, it should only be sending
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// responses, which should never get nacked. There used to be
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// code to hanldle nacks here, but I'm pretty sure it didn't work
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// correctly with the drain code, so that would need to be fixed
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// if we ever added it back.
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assert(pkt->result != Packet::Nacked);
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Tick latency = recvAtomic(pkt);
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// turn packet around to go back to requester
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pkt->makeTimingResponse();
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sendTimingLater(pkt, latency);
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return true;
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}
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void
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SimpleTimingPort::recvRetry()
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{
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bool result = true;
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while (result && transmitList.size()) {
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result = sendTiming(transmitList.front());
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if (result)
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transmitList.pop_front();
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}
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if (transmitList.size() == 0 && drainEvent) {
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drainEvent->process();
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drainEvent = NULL;
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}
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}
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void
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SimpleTimingPort::SendEvent::process()
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{
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port->outTiming--;
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assert(port->outTiming >= 0);
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if (port->sendTiming(packet)) {
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// send successfule
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if (port->transmitList.size() == 0 && port->drainEvent) {
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port->drainEvent->process();
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port->drainEvent = NULL;
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}
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} else {
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// send unsuccessful (due to flow control). Will get retry
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// callback later; save for then.
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port->transmitList.push_back(packet);
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}
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}
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unsigned int
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SimpleTimingPort::drain(Event *de)
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{
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if (outTiming == 0 && transmitList.size() == 0)
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return 0;
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drainEvent = de;
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return 1;
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}
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