kernel.cc revision 13042
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/module.hh" 34#include "systemc/core/scheduler.hh" 35 36namespace sc_gem5 37{ 38 39namespace 40{ 41 42bool stopAfterCallbacks = false; 43bool startComplete = false; 44bool endComplete = false; 45 46sc_core::sc_status _status = sc_core::SC_ELABORATION; 47 48} // anonymous namespace 49 50bool Kernel::startOfSimulationComplete() { return startComplete; } 51bool Kernel::endOfSimulationComplete() { return endComplete; } 52 53sc_core::sc_status Kernel::status() { return _status; } 54void Kernel::status(sc_core::sc_status s) { _status = s; } 55 56Kernel::Kernel(Params *params) : 57 SimObject(params), t0Event(this, false, EventBase::Default_Pri - 1) 58{ 59 // Install ourselves as the scheduler's event manager. 60 ::sc_gem5::scheduler.setEventQueue(eventQueue()); 61} 62 63void 64Kernel::init() 65{ 66 status(::sc_core::SC_BEFORE_END_OF_ELABORATION); 67 for (auto m: sc_gem5::allModules) 68 m->sc_mod()->before_end_of_elaboration(); 69 70 if (stopAfterCallbacks) 71 stopWork(); 72} 73 74void 75Kernel::regStats() 76{ 77 status(::sc_core::SC_END_OF_ELABORATION); 78 for (auto m: sc_gem5::allModules) 79 m->sc_mod()->end_of_elaboration(); 80 81 if (stopAfterCallbacks) 82 stopWork(); 83} 84 85void 86Kernel::startup() 87{ 88 status(::sc_core::SC_START_OF_SIMULATION); 89 for (auto m: sc_gem5::allModules) 90 m->sc_mod()->start_of_simulation(); 91 92 startComplete = true; 93 94 if (stopAfterCallbacks) 95 stopWork(); 96 97 kernel->status(::sc_core::SC_RUNNING); 98 99 schedule(t0Event, curTick()); 100 // Run update once before the event queue starts. 101 ::sc_gem5::scheduler.update(); 102} 103 104void 105Kernel::stop() 106{ 107 if (status() < ::sc_core::SC_RUNNING) 108 stopAfterCallbacks = true; 109 else 110 stopWork(); 111} 112 113void 114Kernel::stopWork() 115{ 116 status(::sc_core::SC_END_OF_SIMULATION); 117 for (auto m: sc_gem5::allModules) 118 m->sc_mod()->end_of_simulation(); 119 120 endComplete = true; 121 122 status(::sc_core::SC_STOPPED); 123 124 if (stopAfterCallbacks) 125 fatal("Simulation called sc_stop during elaboration.\n"); 126} 127 128void 129Kernel::t0Handler() 130{ 131 // Now that the event queue has started, mark all the processes that 132 // need to be initialized as ready to run. 133 // 134 // This event has greater priority than delta notifications and so will 135 // happen before them, honoring the ordering for the initialization phase 136 // in the spec. The delta phase will happen at normal priority, and then 137 // the event which runs the processes which is at a lower priority. 138 ::sc_gem5::scheduler.prepareForInit(); 139 140 status(::sc_core::SC_RUNNING); 141} 142 143Kernel *kernel; 144 145} // namespace sc_gem5 146 147sc_gem5::Kernel * 148SystemC_KernelParams::create() 149{ 150 panic_if(sc_gem5::kernel, 151 "Only one systemc kernel object may be defined.\n"); 152 sc_gem5::kernel = new sc_gem5::Kernel(this); 153 return sc_gem5::kernel; 154} 155