xref: /gem5/src/systemc/core/kernel.cc

/*
 * Copyright 2018 Google, Inc.
 *
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Gabe Black
 */

#include "systemc/core/kernel.hh"
#include "systemc/core/scheduler.hh"

namespace SystemC
{

Kernel::Kernel(Params *params) :
    SimObject(params), t0Event(this, false, EventBase::Default_Pri - 1) {}

void
Kernel::startup()
{
    schedule(t0Event, curTick());
    // Install ourselves as the scheduler's event manager.
    ::sc_gem5::scheduler.setEventQueue(eventQueue());
    // Run update once before the event queue starts.
    ::sc_gem5::scheduler.update();
}

void
Kernel::t0Handler()
{
    // Now that the event queue has started, mark all the processes that
    // need to be initialized as ready to run.
    //
    // This event has greater priority than delta notifications and so will
    // happen before them, honoring the ordering for the initialization phase
    // in the spec. The delta phase will happen at normal priority, and then
    // the event which runs the processes which is at a lower priority.
    ::sc_gem5::scheduler.initToReady();
}

} // namespace SystemC

SystemC::Kernel *
SystemC_KernelParams::create()
{
    return new SystemC::Kernel(this);
}