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Diffstat (limited to 'src/sim/eventq.cc')
| -rw-r--r-- | src/sim/eventq.cc | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/src/sim/eventq.cc b/src/sim/eventq.cc new file mode 100644 index 000000000..4bfd6face --- /dev/null +++ b/src/sim/eventq.cc @@ -0,0 +1,258 @@ +/* + * Copyright (c) 2000-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <assert.h> + +#include <iostream> +#include <string> +#include <vector> + +#include "cpu/smt.hh" +#include "base/misc.hh" + +#include "sim/eventq.hh" +#include "base/trace.hh" +#include "sim/root.hh" + +using namespace std; + +// +// Main Event Queue +// +// Events on this queue are processed at the *beginning* of each +// cycle, before the pipeline simulation is performed. +// +EventQueue mainEventQueue("MainEventQueue"); + +void +EventQueue::insert(Event *event) +{ + if (head == NULL || event->when() < head->when() || + (event->when() == head->when() && + event->priority() <= head->priority())) { + event->next = head; + head = event; + } else { + Event *prev = head; + Event *curr = head->next; + + while (curr) { + if (event->when() <= curr->when() && + (event->when() < curr->when() || + event->priority() <= curr->priority())) + break; + + prev = curr; + curr = curr->next; + } + + event->next = curr; + prev->next = event; + } +} + +void +EventQueue::remove(Event *event) +{ + if (head == NULL) + return; + + if (head == event){ + head = event->next; + return; + } + + Event *prev = head; + Event *curr = head->next; + while (curr && curr != event) { + prev = curr; + curr = curr->next; + } + + if (curr == event) + prev->next = curr->next; +} + +void +EventQueue::serviceOne() +{ + Event *event = head; + event->clearFlags(Event::Scheduled); + head = event->next; + + // handle action + if (!event->squashed()) + event->process(); + else + event->clearFlags(Event::Squashed); + + if (event->getFlags(Event::AutoDelete) && !event->scheduled()) + delete event; +} + + +void +Event::serialize(std::ostream &os) +{ + SERIALIZE_SCALAR(_when); + SERIALIZE_SCALAR(_priority); + SERIALIZE_ENUM(_flags); +} + + +void +Event::unserialize(Checkpoint *cp, const string §ion) +{ + if (scheduled()) + deschedule(); + + UNSERIALIZE_SCALAR(_when); + UNSERIALIZE_SCALAR(_priority); + + // need to see if original event was in a scheduled, unsquashed + // state, but don't want to restore those flags in the current + // object itself (since they aren't immediately true) + UNSERIALIZE_ENUM(_flags); + bool wasScheduled = (_flags & Scheduled) && !(_flags & Squashed); + _flags &= ~(Squashed | Scheduled); + + if (wasScheduled) { + DPRINTF(Config, "rescheduling at %d\n", _when); + schedule(_when); + } +} + +void +EventQueue::serialize(ostream &os) +{ + std::list<Event *> eventPtrs; + + int numEvents = 0; + Event *event = head; + while (event) { + if (event->getFlags(Event::AutoSerialize)) { + eventPtrs.push_back(event); + paramOut(os, csprintf("event%d", numEvents++), event->name()); + } + event = event->next; + } + + SERIALIZE_SCALAR(numEvents); + + for (std::list<Event *>::iterator it=eventPtrs.begin(); + it != eventPtrs.end(); ++it) { + (*it)->nameOut(os); + (*it)->serialize(os); + } +} + +void +EventQueue::unserialize(Checkpoint *cp, const std::string §ion) +{ + int numEvents; + UNSERIALIZE_SCALAR(numEvents); + + std::string eventName; + for (int i = 0; i < numEvents; i++) { + // get the pointer value associated with the event + paramIn(cp, section, csprintf("event%d", i), eventName); + + // create the event based on its pointer value + Serializable::create(cp, eventName); + } +} + +void +EventQueue::dump() +{ + cprintf("============================================================\n"); + cprintf("EventQueue Dump (cycle %d)\n", curTick); + cprintf("------------------------------------------------------------\n"); + + if (empty()) + cprintf("<No Events>\n"); + else { + Event *event = head; + while (event) { + event->dump(); + event = event->next; + } + } + + cprintf("============================================================\n"); +} + +extern "C" +void +dumpMainQueue() +{ + mainEventQueue.dump(); +} + + +const char * +Event::description() +{ + return "generic"; +} + +#if TRACING_ON +void +Event::trace(const char *action) +{ + // This DPRINTF is unconditional because calls to this function + // are protected by an 'if (DTRACE(Event))' in the inlined Event + // methods. + // + // This is just a default implementation for derived classes where + // it's not worth doing anything special. If you want to put a + // more informative message in the trace, override this method on + // the particular subclass where you have the information that + // needs to be printed. + DPRINTFN("%s event %s @ %d\n", description(), action, when()); +} +#endif + +void +Event::dump() +{ + cprintf("Event (%s)\n", description()); + cprintf("Flags: %#x\n", _flags); +#if TRACING_ON + cprintf("Created: %d\n", when_created); +#endif + if (scheduled()) { +#if TRACING_ON + cprintf("Scheduled at %d\n", when_scheduled); +#endif + cprintf("Scheduled for %d, priority %d\n", when(), _priority); + } + else { + cprintf("Not Scheduled\n"); + } +} |