kernel.cc revision 12957:e54f9890363d 
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#include "systemc/core/scheduler.hh"
32
33namespace SystemC
34{
35
36Kernel::Kernel(Params *params) :
37    SimObject(params), t0Event(this, false, EventBase::Default_Pri - 1) {}
38
39void
40Kernel::startup()
41{
42    schedule(t0Event, curTick());
43    // Install ourselves as the scheduler's event manager.
44    ::sc_gem5::scheduler.setEventQueue(eventQueue());
45    // Run update once before the event queue starts.
46    ::sc_gem5::scheduler.update();
47}
48
49void
50Kernel::t0Handler()
51{
52    // Now that the event queue has started, mark all the processes that
53    // need to be initialized as ready to run.
54    //
55    // This event has greater priority than delta notifications and so will
56    // happen before them, honoring the ordering for the initialization phase
57    // in the spec. The delta phase will happen at normal priority, and then
58    // the event which runs the processes which is at a lower priority.
59    ::sc_gem5::scheduler.prepareForInit();
60}
61
62} // namespace SystemC
63
64SystemC::Kernel *
65SystemC_KernelParams::create()
66{
67    return new SystemC::Kernel(this);
68}
69