1/*
2 * Copyright 2018 Google, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met: redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer;
8 * redistributions in binary form must reproduce the above copyright

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37
38namespace sc_gem5
39{
40
41Scheduler::Scheduler() :
42 eq(nullptr), readyEvent(this, false, ReadyPriority),
43 pauseEvent(this, false, PausePriority),
44 stopEvent(this, false, StopPriority),
45 scMain(nullptr),
46 starvationEvent(this, false, StarvationPriority),
47 _started(false), _paused(false), _stopped(false),
48 maxTickEvent(this, false, MaxTickPriority),
49 _numCycles(0), _current(nullptr), initReady(false)
50{}
51
52void
53Scheduler::prepareForInit()
54{
55 for (Process *p = toFinalize.getNext(); p; p = toFinalize.getNext()) {

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140
141void
142Scheduler::scheduleReadyEvent()
143{
144 // Schedule the evaluate and update phases.
145 if (!readyEvent.scheduled()) {
146 panic_if(!eq, "Need to schedule ready, but no event manager.\n");
147 eq->schedule(&readyEvent, eq->getCurTick());
148 if (starvationEvent.scheduled())
149 eq->deschedule(&starvationEvent);
150 }
151}
152
153void
154Scheduler::scheduleStarvationEvent()
155{
156 if (!starvationEvent.scheduled()) {
157 panic_if(!eq, "Need to schedule starvation event, "
158 "but no event manager.\n");
159 eq->schedule(&starvationEvent, eq->getCurTick());
160 if (readyEvent.scheduled())
161 eq->deschedule(&readyEvent);
162 }
163}
164
165void
166Scheduler::runReady()
167{
168 bool empty = readyList.empty();
169
170 // The evaluation phase.
171 do {
172 yield();
173 } while (!readyList.empty());
174
175 if (!empty)
176 _numCycles++;
177
178 // The update phase.
179 update();
180
181 if (starved() && !runToTime)
182 scheduleStarvationEvent();
183
184 // The delta phase will happen naturally through the event queue.
185}
186
187void
188Scheduler::update()
189{
190 Channel *channel = updateList.getNext();
191 while (channel) {

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216{
217 // We should be running from sc_main. Keep track of that Fiber to return
218 // to later.
219 scMain = Fiber::currentFiber();
220
221 _started = true;
222 _paused = false;
223 _stopped = false;
224 runToTime = run_to_time;
225
226 maxTick = max_tick;
227
228 if (starved() && !runToTime)
229 return;
230
231 if (initReady) {
232 kernel->status(::sc_core::SC_RUNNING);
233 eq->schedule(&maxTickEvent, maxTick);
234 }
235
236 // Return to gem5 to let it run events, etc.
237 Fiber::primaryFiber()->run();
238
239 if (pauseEvent.scheduled())
240 eq->deschedule(&pauseEvent);
241 if (stopEvent.scheduled())
242 eq->deschedule(&stopEvent);
243 if (maxTickEvent.scheduled())
244 eq->deschedule(&maxTickEvent);
245 if (starvationEvent.scheduled())
246 eq->deschedule(&starvationEvent);
247}
248
249void
250Scheduler::schedulePause()
251{
252 if (pauseEvent.scheduled())
253 return;
254

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