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37 * Authors: Andrew Bardsley
43 * Base classes for ClockedObjects which have evaluate functions to
44 * look like clock ticking operations. TickedObject attaches gem5's event
45 * queue to Ticked to apply actual scheduling.
48 #ifndef __SIM_TICKED_OBJECT_HH__
49 #define __SIM_TICKED_OBJECT_HH__
51 #include "sim/clocked_object.hh"
53 class TickedObjectParams;
55 /** Ticked attaches gem5's event queue/scheduler to evaluate
56 * calls and provides a start/stop interface to ticking.
58 * Ticked is not a ClockedObject but can be attached to one by
59 * inheritance and by calling regStats, serialize/unserialize */
60 class Ticked : public Serializable
63 /** ClockedObject who is responsible for this Ticked's actions/stats */
64 ClockedObject &object;
66 /** The wrapper for processClockEvent */
67 EventFunctionWrapper event;
69 /** Evaluate and reschedule */
70 void processClockEvent();
72 /** Have I been started? and am not stopped */
75 /** Time of last stop event to calculate run time */
79 /** Locally allocated stats */
80 Stats::Scalar *numCyclesLocal;
83 /** Total number of cycles either ticked or spend stopped */
84 Stats::Scalar &numCycles;
86 /** Number of cycles ticked */
87 Stats::Scalar tickCycles;
89 /** Number of cycles stopped */
90 Stats::Formula idleCycles;
93 Ticked(ClockedObject &object_,
94 Stats::Scalar *imported_num_cycles = NULL,
95 Event::Priority priority = Event::CPU_Tick_Pri);
99 /** Register {num,ticks}Cycles if necessary. If numCycles is
100 * imported, be sure to register it *before* calling this regStats */
108 if (!event.scheduled())
109 object.schedule(event, object.clockEdge(Cycles(1)));
111 numCycles += cyclesSinceLastStopped();
112 countCycles(cyclesSinceLastStopped());
116 /** How long have we been stopped for? */
118 cyclesSinceLastStopped() const
120 return object.curCycle() - lastStopped;
123 /** Reset stopped time to current time */
127 lastStopped = object.curCycle();
130 /** Cancel the next tick event and issue no more */
135 if (event.scheduled())
136 object.deschedule(event);
142 /** Checkpoint lastStopped */
143 void serialize(CheckpointOut &cp) const override;
144 void unserialize(CheckpointIn &cp) override;
146 /** Action to call on the clock tick */
147 virtual void evaluate() = 0;
150 * Callback to handle cycle statistics and probes.
152 * This callback is called at the beginning of a new cycle active
153 * cycle and when restarting the ticked object. The delta
154 * parameter indicates the number of cycles elapsed since the
155 * previous call is normally '1' unless the object has been
156 * stopped and restarted.
158 * @param delta Number of cycles since the previous call.
160 virtual void countCycles(Cycles delta) {}
163 /** TickedObject attaches Ticked to ClockedObject and can be used as
164 * a base class where ticked operation */
165 class TickedObject : public ClockedObject, public Ticked
168 TickedObject(const TickedObjectParams *params,
169 Event::Priority priority = Event::CPU_Tick_Pri);
171 /** Disambiguate to make these functions overload correctly */
172 using ClockedObject::regStats;
173 using ClockedObject::serialize;
174 using ClockedObject::unserialize;
176 /** Pass on regStats, serialize etc. onto Ticked */
177 void regStats() override;
178 void serialize(CheckpointOut &cp) const override;
179 void unserialize(CheckpointIn &cp) override;
182 #endif /* __SIM_TICKED_OBJECT_HH__ */