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Diffstat (limited to 'src/sim/simulate.cc')
| -rw-r--r-- | src/sim/simulate.cc | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/sim/simulate.cc b/src/sim/simulate.cc new file mode 100644 index 000000000..55cbb50a9 --- /dev/null +++ b/src/sim/simulate.cc @@ -0,0 +1,121 @@ +/* + * Copyright (c) 2006 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. + * + * Authors: Nathan Binkert + * Steve Reinhardt + */ + +#include "base/misc.hh" +#include "base/pollevent.hh" +#include "sim/stat_control.hh" +#include "sim/async.hh" +#include "sim/eventq.hh" +#include "sim/host.hh" +#include "sim/sim_events.hh" +#include "sim/sim_exit.hh" +#include "sim/simulate.hh" + +/** Simulate for num_cycles additional cycles. If num_cycles is -1 + * (the default), do not limit simulation; some other event must + * terminate the loop. Exported to Python via SWIG. + * @return The SimLoopExitEvent that caused the loop to exit. + */ +SimLoopExitEvent * +simulate(Tick num_cycles) +{ + warn("Entering event queue @ %d. Starting simulation...\n", curTick); + + if (num_cycles < 0) + fatal("simulate: num_cycles must be >= 0 (was %d)\n", num_cycles); + else if (curTick + num_cycles < 0) //Overflow + num_cycles = MaxTick; + else + num_cycles = curTick + num_cycles; + + Event *limit_event; + limit_event = schedExitSimLoop("simulate() limit reached", num_cycles); + + while (1) { + // there should always be at least one event (the SimLoopExitEvent + // we just scheduled) in the queue + assert(!mainEventQueue.empty()); + assert(curTick <= mainEventQueue.nextTick() && + "event scheduled in the past"); + + // forward current cycle to the time of the first event on the + // queue + curTick = mainEventQueue.nextTick(); + Event *exit_event = mainEventQueue.serviceOne(); + if (exit_event != NULL) { + // hit some kind of exit event; return to Python + // event must be subclass of SimLoopExitEvent... + SimLoopExitEvent *se_event; + se_event = dynamic_cast<SimLoopExitEvent *>(exit_event); + + if (se_event == NULL) + panic("Bogus exit event class!"); + + // if we didn't hit limit_event, delete it + if (se_event != limit_event) { + assert(limit_event->scheduled()); + limit_event->deschedule(); + delete limit_event; + } + + return se_event; + } + + if (async_event) { + async_event = false; + if (async_statdump || async_statreset) { + async_statdump = false; + async_statreset = false; + + Stats::StatEvent(async_statdump, async_statreset); + } + + if (async_exit) { + async_exit = false; + exitSimLoop("user interrupt received"); + } + + if (async_io || async_alarm) { + async_io = false; + async_alarm = false; + pollQueue.service(); + } + + if (async_exception) { + async_exception = false; + return NULL; + } + } + } + + // not reached... only exit is return on SimLoopExitEvent +} + |