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/*
* 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
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Gabe Black
*/
#include "systemc/core/kernel.hh"
#include "base/logging.hh"
#include "systemc/core/module.hh"
#include "systemc/core/scheduler.hh"
namespace sc_gem5
{
namespace
{
bool stopAfterCallbacks = false;
bool startComplete = false;
bool endComplete = false;
sc_core::sc_status _status = sc_core::SC_ELABORATION;
} // anonymous namespace
bool Kernel::startOfSimulationComplete() { return startComplete; }
bool Kernel::endOfSimulationComplete() { return endComplete; }
sc_core::sc_status Kernel::status() { return _status; }
void Kernel::status(sc_core::sc_status s) { _status = s; }
Kernel::Kernel(Params *params) :
SimObject(params), t0Event(this, false, EventBase::Default_Pri - 1)
{
// Install ourselves as the scheduler's event manager.
::sc_gem5::scheduler.setEventQueue(eventQueue());
}
void
Kernel::init()
{
status(::sc_core::SC_BEFORE_END_OF_ELABORATION);
for (auto m: sc_gem5::allModules) {
callbackModule(m);
m->sc_mod()->before_end_of_elaboration();
}
callbackModule(nullptr);
if (stopAfterCallbacks)
stopWork();
}
void
Kernel::regStats()
{
status(::sc_core::SC_END_OF_ELABORATION);
for (auto m: sc_gem5::allModules)
m->sc_mod()->end_of_elaboration();
if (stopAfterCallbacks)
stopWork();
}
void
Kernel::startup()
{
status(::sc_core::SC_START_OF_SIMULATION);
for (auto m: sc_gem5::allModules)
m->sc_mod()->start_of_simulation();
startComplete = true;
if (stopAfterCallbacks)
stopWork();
kernel->status(::sc_core::SC_RUNNING);
schedule(t0Event, curTick());
// Run update once before the event queue starts.
::sc_gem5::scheduler.update();
}
void
Kernel::stop()
{
if (status() < ::sc_core::SC_RUNNING)
stopAfterCallbacks = true;
else
stopWork();
}
void
Kernel::stopWork()
{
status(::sc_core::SC_END_OF_SIMULATION);
for (auto m: sc_gem5::allModules)
m->sc_mod()->end_of_simulation();
endComplete = true;
status(::sc_core::SC_STOPPED);
if (stopAfterCallbacks)
fatal("Simulation called sc_stop during elaboration.\n");
}
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.prepareForInit();
status(::sc_core::SC_RUNNING);
}
Kernel *kernel;
} // namespace sc_gem5
sc_gem5::Kernel *
SystemC_KernelParams::create()
{
panic_if(sc_gem5::kernel,
"Only one systemc kernel object may be defined.\n");
sc_gem5::kernel = new sc_gem5::Kernel(this);
return sc_gem5::kernel;
}
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