kernel.cc revision 12982
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 39Kernel::Kernel(Params *params) : 40 SimObject(params), _stopAfterCallbacks(false), 41 _startComplete(false), _endComplete(false), 42 _status(sc_core::SC_ELABORATION), 43 t0Event(this, false, EventBase::Default_Pri - 1) {} 44 45void 46Kernel::init() 47{ 48 kernel->status(::sc_core::SC_BEFORE_END_OF_ELABORATION); 49 for (auto m: sc_gem5::allModules) 50 m->sc_mod()->before_end_of_elaboration(); 51 52 if (_stopAfterCallbacks) 53 stopWork(); 54} 55 56void 57Kernel::regStats() 58{ 59 kernel->status(::sc_core::SC_END_OF_ELABORATION); 60 for (auto m: sc_gem5::allModules) 61 m->sc_mod()->end_of_elaboration(); 62 63 if (_stopAfterCallbacks) 64 stopWork(); 65} 66 67void 68Kernel::startup() 69{ 70 kernel->status(::sc_core::SC_START_OF_SIMULATION); 71 for (auto m: sc_gem5::allModules) 72 m->sc_mod()->start_of_simulation(); 73 74 _startComplete = true; 75 76 if (_stopAfterCallbacks) 77 stopWork(); 78 79 kernel->status(::sc_core::SC_RUNNING); 80 81 schedule(t0Event, curTick()); 82 // Install ourselves as the scheduler's event manager. 83 ::sc_gem5::scheduler.setEventQueue(eventQueue()); 84 // Run update once before the event queue starts. 85 ::sc_gem5::scheduler.update(); 86} 87 88void 89Kernel::stop() 90{ 91 if (status() < ::sc_core::SC_RUNNING) 92 _stopAfterCallbacks = true; 93 else 94 stopWork(); 95} 96 97void 98Kernel::stopWork() 99{ 100 kernel->status(::sc_core::SC_END_OF_SIMULATION); 101 for (auto m: sc_gem5::allModules) 102 m->sc_mod()->end_of_simulation(); 103 104 _endComplete = true; 105 106 kernel->status(::sc_core::SC_STOPPED); 107 108 if (_stopAfterCallbacks) 109 fatal("Simulation called sc_stop during elaboration.\n"); 110} 111 112void 113Kernel::t0Handler() 114{ 115 // Now that the event queue has started, mark all the processes that 116 // need to be initialized as ready to run. 117 // 118 // This event has greater priority than delta notifications and so will 119 // happen before them, honoring the ordering for the initialization phase 120 // in the spec. The delta phase will happen at normal priority, and then 121 // the event which runs the processes which is at a lower priority. 122 ::sc_gem5::scheduler.prepareForInit(); 123 124 status(::sc_core::SC_RUNNING); 125} 126 127Kernel *kernel; 128 129} // namespace sc_gem5 130 131sc_gem5::Kernel * 132SystemC_KernelParams::create() 133{ 134 panic_if(sc_gem5::kernel, 135 "Only one systemc kernel object may be defined.\n"); 136 sc_gem5::kernel = new sc_gem5::Kernel(this); 137 return sc_gem5::kernel; 138} 139