1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Copyright (c) 2013-2014, 2017 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* 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: Andrew Bardsley
*/
/**
* @file
*
* Base classes for ClockedObjects which have evaluate functions to
* look like clock ticking operations. TickedObject attaches gem5's event
* queue to Ticked to apply actual scheduling.
*/
#ifndef __SIM_TICKED_OBJECT_HH__
#define __SIM_TICKED_OBJECT_HH__
#include "sim/clocked_object.hh"
class TickedObjectParams;
/** Ticked attaches gem5's event queue/scheduler to evaluate
* calls and provides a start/stop interface to ticking.
*
* Ticked is not a ClockedObject but can be attached to one by
* inheritance and by calling regStats, serialize/unserialize */
class Ticked : public Serializable
{
protected:
/** ClockedObject who is responsible for this Ticked's actions/stats */
ClockedObject &object;
/** The wrapper for processClockEvent */
EventFunctionWrapper event;
/** Evaluate and reschedule */
void processClockEvent();
/** Have I been started? and am not stopped */
bool running;
/** Time of last stop event to calculate run time */
Cycles lastStopped;
private:
/** Locally allocated stats */
Stats::Scalar *numCyclesLocal;
protected:
/** Total number of cycles either ticked or spend stopped */
Stats::Scalar &numCycles;
/** Number of cycles ticked */
Stats::Scalar tickCycles;
/** Number of cycles stopped */
Stats::Formula idleCycles;
public:
Ticked(ClockedObject &object_,
Stats::Scalar *imported_num_cycles = NULL,
Event::Priority priority = Event::CPU_Tick_Pri);
virtual ~Ticked() { }
/** Register {num,ticks}Cycles if necessary. If numCycles is
* imported, be sure to register it *before* calling this regStats */
void regStats();
/** Start ticking */
void
start()
{
if (!running) {
if (!event.scheduled())
object.schedule(event, object.clockEdge(Cycles(1)));
running = true;
numCycles += cyclesSinceLastStopped();
countCycles(cyclesSinceLastStopped());
}
}
/** How long have we been stopped for? */
Cycles
cyclesSinceLastStopped() const
{
return object.curCycle() - lastStopped;
}
/** Reset stopped time to current time */
void
resetLastStopped()
{
lastStopped = object.curCycle();
}
/** Cancel the next tick event and issue no more */
void
stop()
{
if (running) {
if (event.scheduled())
object.deschedule(event);
running = false;
resetLastStopped();
}
}
/** Checkpoint lastStopped */
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
/** Action to call on the clock tick */
virtual void evaluate() = 0;
/**
* Callback to handle cycle statistics and probes.
*
* This callback is called at the beginning of a new cycle active
* cycle and when restarting the ticked object. The delta
* parameter indicates the number of cycles elapsed since the
* previous call is normally '1' unless the object has been
* stopped and restarted.
*
* @param delta Number of cycles since the previous call.
*/
virtual void countCycles(Cycles delta) {}
};
/** TickedObject attaches Ticked to ClockedObject and can be used as
* a base class where ticked operation */
class TickedObject : public ClockedObject, public Ticked
{
public:
TickedObject(const TickedObjectParams *params,
Event::Priority priority = Event::CPU_Tick_Pri);
/** Disambiguate to make these functions overload correctly */
using ClockedObject::regStats;
using ClockedObject::serialize;
using ClockedObject::unserialize;
/** Pass on regStats, serialize etc. onto Ticked */
void regStats() override;
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
};
#endif /* __SIM_TICKED_OBJECT_HH__ */
|
