kernel.cc revision 13094:e74742df378b 
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
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution;
11 * neither the name of the copyright holders nor the names of its
12 * contributors may be used to endorse or promote products derived from
13 * this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * Authors: Gabe Black
28 */
29
30#include "systemc/core/kernel.hh"
31
32#include "base/logging.hh"
33#include "systemc/core/channel.hh"
34#include "systemc/core/module.hh"
35#include "systemc/core/scheduler.hh"
36
37namespace sc_gem5
38{
39
40namespace
41{
42
43bool scMainDone = false;
44bool stopAfterCallbacks = false;
45bool startComplete = false;
46bool endComplete = false;
47
48sc_core::sc_status _status = sc_core::SC_ELABORATION;
49
50} // anonymous namespace
51
52bool Kernel::startOfSimulationComplete() { return startComplete; }
53bool Kernel::endOfSimulationComplete() { return endComplete; }
54
55bool Kernel::scMainFinished() { return scMainDone; }
56void Kernel::scMainFinished(bool finished) { scMainDone = finished; }
57
58sc_core::sc_status Kernel::status() { return _status; }
59void Kernel::status(sc_core::sc_status s) { _status = s; }
60
61Kernel::Kernel(Params *params) :
62    SimObject(params), t0Event(this, false, EventBase::Default_Pri - 1)
63{
64    // Install ourselves as the scheduler's event manager.
65    ::sc_gem5::scheduler.setEventQueue(eventQueue());
66}
67
68void
69Kernel::init()
70{
71    if (scMainDone)
72        return;
73
74    if (stopAfterCallbacks)
75        fatal("Simulation called sc_stop during elaboration.\n");
76
77    status(::sc_core::SC_BEFORE_END_OF_ELABORATION);
78    for (auto m: sc_gem5::allModules) {
79        callbackModule(m);
80        m->sc_mod()->before_end_of_elaboration();
81        for (auto p: m->ports)
82            p->before_end_of_elaboration();
83        for (auto e: m->exports)
84            e->before_end_of_elaboration();
85    }
86    callbackModule(nullptr);
87    for (auto c: sc_gem5::allChannels)
88        c->sc_chan()->before_end_of_elaboration();
89
90    if (stopAfterCallbacks)
91        stopWork();
92}
93
94void
95Kernel::regStats()
96{
97    if (scMainDone)
98        return;
99
100    for (auto m: sc_gem5::allModules)
101        for (auto p: m->ports)
102            p->_gem5Finalize();
103
104    status(::sc_core::SC_END_OF_ELABORATION);
105    for (auto m: sc_gem5::allModules) {
106        m->sc_mod()->end_of_elaboration();
107        for (auto p: m->ports)
108            p->end_of_elaboration();
109        for (auto e: m->exports)
110            e->end_of_elaboration();
111    }
112    for (auto c: sc_gem5::allChannels)
113        c->sc_chan()->end_of_elaboration();
114
115    if (stopAfterCallbacks)
116        stopWork();
117}
118
119void
120Kernel::startup()
121{
122    if (scMainDone)
123        return;
124
125    status(::sc_core::SC_START_OF_SIMULATION);
126    for (auto m: sc_gem5::allModules) {
127        m->sc_mod()->start_of_simulation();
128        for (auto p: m->ports)
129            p->start_of_simulation();
130        for (auto e: m->exports)
131            e->start_of_simulation();
132    }
133    for (auto c: sc_gem5::allChannels)
134        c->sc_chan()->start_of_simulation();
135
136    startComplete = true;
137
138    if (stopAfterCallbacks)
139        stopWork();
140
141    kernel->status(::sc_core::SC_RUNNING);
142
143    schedule(t0Event, curTick());
144    // Run update once before the event queue starts.
145    ::sc_gem5::scheduler.update();
146}
147
148void
149Kernel::stop()
150{
151    if (status() < ::sc_core::SC_RUNNING)
152        stopAfterCallbacks = true;
153    else
154        stopWork();
155}
156
157void
158Kernel::stopWork()
159{
160    status(::sc_core::SC_END_OF_SIMULATION);
161    for (auto m: sc_gem5::allModules) {
162        m->sc_mod()->end_of_simulation();
163        for (auto p: m->ports)
164            p->end_of_simulation();
165        for (auto e: m->exports)
166            e->end_of_simulation();
167    }
168    for (auto c: sc_gem5::allChannels)
169        c->sc_chan()->end_of_simulation();
170
171    endComplete = true;
172
173    status(::sc_core::SC_STOPPED);
174}
175
176void
177Kernel::t0Handler()
178{
179    ::sc_gem5::scheduler.initPhase();
180
181    status(::sc_core::SC_RUNNING);
182}
183
184Kernel *kernel;
185
186} // namespace sc_gem5
187
188sc_gem5::Kernel *
189SystemC_KernelParams::create()
190{
191    panic_if(sc_gem5::kernel,
192            "Only one systemc kernel object may be defined.\n");
193    sc_gem5::kernel = new sc_gem5::Kernel(this);
194    return sc_gem5::kernel;
195}
196