summaryrefslogtreecommitdiff
path: root/sim/eventq.cc
blob: eab499bd90ca07c814d4c98bd48a46d2599e64b4 (plain)
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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/*
 * Copyright (c) 2003 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.
 */

#include <assert.h>

#include <iostream>
#include <string>
#include <sstream>
#include <vector>

#include "cpu/full_cpu/smt.hh"
#include "base/misc.hh"

#include "sim/eventq.hh"
#include "base/trace.hh"
#include "sim/universe.hh"

using namespace std;

const string Event::defaultName("event");

//
// Main Event Queue
//
// Events on this queue are processed at the *beginning* of each
// cycle, before the pipeline simulation is performed.
//
EventQueue mainEventQueue("MainEventQueue");

void
EventQueue::insert(Event *event)
{
    if (head == NULL || event->when() < head->when() ||
        (event->when() == head->when() &&
         event->priority() <= head->priority())) {
        event->next = head;
        head = event;
    } else {
        Event *prev = head;
        Event *curr = head->next;

        while (curr) {
            if (event->when() <= curr->when() &&
                (event->when() < curr->when() ||
                 event->priority() <= curr->priority()))
                break;

            prev = curr;
            curr = curr->next;
        }

        event->next = curr;
        prev->next = event;
    }
}

void
EventQueue::remove(Event *event)
{
    if (head == NULL)
        return;

    if (head == event){
        head = event->next;
        return;
    }

    Event *prev = head;
    Event *curr = head->next;
    while (curr && curr != event) {
        prev = curr;
        curr = curr->next;
    }

    if (curr == event)
        prev->next = curr->next;
}

void
EventQueue::serviceOne()
{
    Event *event = head;
    event->clearFlags(Event::Scheduled);
    head = event->next;

    // handle action
    if (!event->squashed())
        event->process();
    else
        event->clearFlags(Event::Squashed);

    if (event->getFlags(Event::AutoDelete))
        delete event;
}


void
Event::serialize(std::ostream &os)
{
    SERIALIZE_SCALAR(_when);
    SERIALIZE_SCALAR(_priority);
    SERIALIZE_ENUM(_flags);
}


void
Event::unserialize(Checkpoint *cp, const string &section)
{
    if (scheduled())
        deschedule();

    UNSERIALIZE_SCALAR(_when);
    UNSERIALIZE_SCALAR(_priority);

    // need to see if original event was in a scheduled, unsquashed
    // state, but don't want to restore those flags in the current
    // object itself (since they aren't immediately true)
    UNSERIALIZE_ENUM(_flags);
    bool wasScheduled = (_flags & Scheduled) && !(_flags & Squashed);
    _flags &= ~(Squashed | Scheduled);

    if (wasScheduled) {
        DPRINTF(Config, "rescheduling at %d\n", _when);
        schedule(_when);
    }
}

void
EventQueue::serialize(ostream &os)
{
    std::list<Event *> eventPtrs;

    int numEvents = 0;
    Event *event = head;
    while (event) {
        if (event->getFlags(Event::AutoSerialize)) {
            eventPtrs.push_back(event);
            numEvents++;
        }
        event = event->next;
    }

    SERIALIZE_SCALAR(numEvents);

    int i = 0;
    for (std::list<Event *>::iterator it=eventPtrs.begin();
         it != eventPtrs.end(); ++it) {
        paramOut(os, csprintf("%s.eventPtr%d", name(), i++), (uintptr_t)*it);
    }

    for (std::list<Event *>::iterator it=eventPtrs.begin();
         it != eventPtrs.end(); ++it) {
        (*it)->nameOut(os);
        (*it)->serialize(os);
    }
}

void
EventQueue::unserialize(Checkpoint *cp, const std::string &section)
{
    int numEvents;
    uintptr_t ptr;

    UNSERIALIZE_SCALAR(numEvents);

    for (int i = 0; i < numEvents; i++) {
        // get the pointer value associated with the event
        paramIn(cp, section, csprintf("%s.eventPtr%d", name(), i), ptr);

        // create the event based on its pointer value
        Serializeable::create(cp, csprintf("%s_%x", Event::defaultName, ptr));
    }
}

void
EventQueue::dump()
{
    cprintf("============================================================\n");
    cprintf("EventQueue Dump  (cycle %d)\n", curTick);
    cprintf("------------------------------------------------------------\n");

    if (empty())
        cprintf("<No Events>\n");
    else {
        Event *event = head;
        while (event) {
            event->dump();
            event = event->next;
        }
    }

    cprintf("============================================================\n");
}


const char *
Event::description()
{
    return "generic";
}

#if TRACING_ON
void
Event::trace(const char *action)
{
    // This DPRINTF is unconditional because calls to this function
    // are protected by an 'if (DTRACE(Event))' in the inlined Event
    // methods.
    //
    // This is just a default implementation for derived classes where
    // it's not worth doing anything special.  If you want to put a
    // more informative message in the trace, override this method on
    // the particular subclass where you have the information that
    // needs to be printed.
    DPRINTFN("%s event %s @ %d\n", description(), action, when());
}
#endif

void
Event::dump()
{
#if TRACING_ON
    cprintf("   Created: %d\n", when_created);
#endif
    if (scheduled()) {
#if TRACING_ON
        cprintf("   Scheduled at  %d\n", when_scheduled);
#endif
        cprintf("   Scheduled for %d\n", when());
    }
    else {
        cprintf("   Not Scheduled\n");
    }
}