kernel.cc revision 13053
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 callbackModule(m); 69 m->sc_mod()->before_end_of_elaboration(); 70 } 71 callbackModule(nullptr); 72 73 if (stopAfterCallbacks) 74 stopWork(); 75} 76 77void 78Kernel::regStats() 79{ 80 for (auto m: sc_gem5::allModules) 81 for (auto p: m->ports) 82 p->_gem5Finalize(); 83 84 status(::sc_core::SC_END_OF_ELABORATION); 85 for (auto m: sc_gem5::allModules) 86 m->sc_mod()->end_of_elaboration(); 87 88 if (stopAfterCallbacks) 89 stopWork(); 90} 91 92void 93Kernel::startup() 94{ 95 status(::sc_core::SC_START_OF_SIMULATION); 96 for (auto m: sc_gem5::allModules) 97 m->sc_mod()->start_of_simulation(); 98 99 startComplete = true; 100 101 if (stopAfterCallbacks) 102 stopWork(); 103 104 kernel->status(::sc_core::SC_RUNNING); 105 106 schedule(t0Event, curTick()); 107 // Run update once before the event queue starts. 108 ::sc_gem5::scheduler.update(); 109} 110 111void 112Kernel::stop() 113{ 114 if (status() < ::sc_core::SC_RUNNING) 115 stopAfterCallbacks = true; 116 else 117 stopWork(); 118} 119 120void 121Kernel::stopWork() 122{ 123 status(::sc_core::SC_END_OF_SIMULATION); 124 for (auto m: sc_gem5::allModules) 125 m->sc_mod()->end_of_simulation(); 126 127 endComplete = true; 128 129 status(::sc_core::SC_STOPPED); 130 131 if (stopAfterCallbacks) 132 fatal("Simulation called sc_stop during elaboration.\n"); 133} 134 135void 136Kernel::t0Handler() 137{ 138 // Now that the event queue has started, mark all the processes that 139 // need to be initialized as ready to run. 140 // 141 // This event has greater priority than delta notifications and so will 142 // happen before them, honoring the ordering for the initialization phase 143 // in the spec. The delta phase will happen at normal priority, and then 144 // the event which runs the processes which is at a lower priority. 145 ::sc_gem5::scheduler.prepareForInit(); 146 147 status(::sc_core::SC_RUNNING); 148} 149 150Kernel *kernel; 151 152} // namespace sc_gem5 153 154sc_gem5::Kernel * 155SystemC_KernelParams::create() 156{ 157 panic_if(sc_gem5::kernel, 158 "Only one systemc kernel object may be defined.\n"); 159 sc_gem5::kernel = new sc_gem5::Kernel(this); 160 return sc_gem5::kernel; 161} 162