kernel.cc revision 13067:3d6ef32002ef 
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 stopAfterCallbacks = false;
44bool startComplete = false;
45bool endComplete = false;
46
47sc_core::sc_status _status = sc_core::SC_ELABORATION;
48
49} // anonymous namespace
50
51bool Kernel::startOfSimulationComplete() { return startComplete; }
52bool Kernel::endOfSimulationComplete() { return endComplete; }
53
54sc_core::sc_status Kernel::status() { return _status; }
55void Kernel::status(sc_core::sc_status s) { _status = s; }
56
57Kernel::Kernel(Params *params) :
58    SimObject(params), t0Event(this, false, EventBase::Default_Pri - 1)
59{
60    // Install ourselves as the scheduler's event manager.
61    ::sc_gem5::scheduler.setEventQueue(eventQueue());
62}
63
64void
65Kernel::init()
66{
67    status(::sc_core::SC_BEFORE_END_OF_ELABORATION);
68    for (auto m: sc_gem5::allModules) {
69        callbackModule(m);
70        m->sc_mod()->before_end_of_elaboration();
71        for (auto p: m->ports)
72            p->before_end_of_elaboration();
73        for (auto e: m->exports)
74            e->before_end_of_elaboration();
75    }
76    callbackModule(nullptr);
77    for (auto c: sc_gem5::allChannels)
78        c->sc_chan()->before_end_of_elaboration();
79
80    if (stopAfterCallbacks)
81        stopWork();
82}
83
84void
85Kernel::regStats()
86{
87    for (auto m: sc_gem5::allModules)
88        for (auto p: m->ports)
89            p->_gem5Finalize();
90
91    status(::sc_core::SC_END_OF_ELABORATION);
92    for (auto m: sc_gem5::allModules) {
93        m->sc_mod()->end_of_elaboration();
94        for (auto p: m->ports)
95            p->end_of_elaboration();
96        for (auto e: m->exports)
97            e->end_of_elaboration();
98    }
99    for (auto c: sc_gem5::allChannels)
100        c->sc_chan()->end_of_elaboration();
101
102    if (stopAfterCallbacks)
103        stopWork();
104}
105
106void
107Kernel::startup()
108{
109    status(::sc_core::SC_START_OF_SIMULATION);
110    for (auto m: sc_gem5::allModules) {
111        m->sc_mod()->start_of_simulation();
112        for (auto p: m->ports)
113            p->start_of_simulation();
114        for (auto e: m->exports)
115            e->start_of_simulation();
116    }
117    for (auto c: sc_gem5::allChannels)
118        c->sc_chan()->start_of_simulation();
119
120    startComplete = true;
121
122    if (stopAfterCallbacks)
123        stopWork();
124
125    kernel->status(::sc_core::SC_RUNNING);
126
127    schedule(t0Event, curTick());
128    // Run update once before the event queue starts.
129    ::sc_gem5::scheduler.update();
130}
131
132void
133Kernel::stop()
134{
135    if (status() < ::sc_core::SC_RUNNING)
136        stopAfterCallbacks = true;
137    else
138        stopWork();
139}
140
141void
142Kernel::stopWork()
143{
144    status(::sc_core::SC_END_OF_SIMULATION);
145    for (auto m: sc_gem5::allModules) {
146        m->sc_mod()->end_of_simulation();
147        for (auto p: m->ports)
148            p->end_of_simulation();
149        for (auto e: m->exports)
150            e->end_of_simulation();
151    }
152    for (auto c: sc_gem5::allChannels)
153        c->sc_chan()->end_of_simulation();
154
155    endComplete = true;
156
157    status(::sc_core::SC_STOPPED);
158
159    if (stopAfterCallbacks)
160        fatal("Simulation called sc_stop during elaboration.\n");
161}
162
163void
164Kernel::t0Handler()
165{
166    ::sc_gem5::scheduler.initPhase();
167
168    status(::sc_core::SC_RUNNING);
169}
170
171Kernel *kernel;
172
173} // namespace sc_gem5
174
175sc_gem5::Kernel *
176SystemC_KernelParams::create()
177{
178    panic_if(sc_gem5::kernel,
179            "Only one systemc kernel object may be defined.\n");
180    sc_gem5::kernel = new sc_gem5::Kernel(this);
181    return sc_gem5::kernel;
182}
183