1/*
2 * Copyright (c) 2012-2013 ARM Limited
3 * Copyright (c) 2013 Cornell University
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating

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50#include "base/intmath.hh"
51#include "base/misc.hh"
52#include "params/ClockedObject.hh"
53#include "sim/core.hh"
54#include "sim/clock_domain.hh"
55#include "sim/sim_object.hh"
56
57/**
58 * The ClockedObject class extends the SimObject with a clock and
59 * accessor functions to relate ticks to the cycles of the object.
60 */
61class ClockedObject : public SimObject
62{
63
64 private:
65
66 // the tick value of the next clock edge (>= curTick()) at the
67 // time of the last call to update()
68 mutable Tick tick;
69
70 // The cycle counter value corresponding to the current value of
71 // 'tick'
72 mutable Cycles cycle;
73
74 /**
75 * Prevent inadvertent use of the copy constructor and assignment
76 * operator by making them private.
77 */
78 ClockedObject(ClockedObject&);
79 ClockedObject& operator=(ClockedObject&);
80
81 /**
82 * Align cycle and tick to the next clock edge if not already done. When
83 * complete, tick must be at least curTick().
84 */
85 void update() const
86 {
87 // both tick and cycle are up-to-date and we are done, note
88 // that the >= is important as it captures cases where tick
89 // has already passed curTick()

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113 ClockDomain &clockDomain;
114
115 protected:
116
117 /**
118 * Create a clocked object and set the clock domain based on the
119 * parameters.
120 */
121 ClockedObject(const ClockedObjectParams* p) :
122 SimObject(p), tick(0), cycle(0), clockDomain(*p->clk_domain)
123 {
124 // Register with the clock domain, so that if the clock domain
125 // frequency changes, we can update this object's tick.
126 clockDomain.registerWithClockDomain(this);
127 }
128
129 /**
130 * Virtual destructor due to inheritance.
131 */
132 virtual ~ClockedObject() { }
133
134 /**
135 * Reset the object's clock using the current global tick value. Likely
136 * to be used only when the global clock is reset. Currently, this done
137 * only when Ruby is done warming up the memory system.
138 */
139 void resetClock() const
140 {

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216 return clockDomain.clockPeriod();
217 }
218
219 inline Cycles ticksToCycles(Tick t) const
220 { return Cycles(divCeil(t, clockPeriod())); }
221
222};
223
224#endif //__SIM_CLOCKED_OBJECT_HH__