12SN/A/* 21762SN/A * Copyright (c) 2002-2005 The Regents of The University of Michigan 38332Snate@binkert.org * Copyright (c) 2011 Advanced Micro Devices, Inc. 42SN/A * All rights reserved. 52SN/A * 62SN/A * Redistribution and use in source and binary forms, with or without 72SN/A * modification, are permitted provided that the following conditions are 82SN/A * met: redistributions of source code must retain the above copyright 92SN/A * notice, this list of conditions and the following disclaimer; 102SN/A * redistributions in binary form must reproduce the above copyright 112SN/A * notice, this list of conditions and the following disclaimer in the 122SN/A * documentation and/or other materials provided with the distribution; 132SN/A * neither the name of the copyright holders nor the names of its 142SN/A * contributors may be used to endorse or promote products derived from 152SN/A * this software without specific prior written permission. 162SN/A * 172SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 182SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 192SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 202SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 212SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 222SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 232SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 242SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 252SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 262SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 272SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 282665Ssaidi@eecs.umich.edu * 292665Ssaidi@eecs.umich.edu * Authors: Nathan Binkert 302665Ssaidi@eecs.umich.edu * Steve Reinhardt 317861Sgblack@eecs.umich.edu * Gabe Black 322SN/A */ 332SN/A 3412334Sgabeblack@google.com#include "base/logging.hh" 359356Snilay@cs.wisc.edu#include "base/trace.hh" 369048SAli.Saidi@ARM.com#include "config/the_isa.hh" 378232Snate@binkert.org#include "debug/TimeSync.hh" 3811800Sbrandon.potter@amd.com#include "sim/eventq_impl.hh" 398801Sgblack@eecs.umich.edu#include "sim/full_system.hh" 4011800Sbrandon.potter@amd.com#include "sim/root.hh" 411609SN/A 427861Sgblack@eecs.umich.eduRoot *Root::_root = NULL; 437861Sgblack@eecs.umich.edu 447861Sgblack@eecs.umich.edu/* 457861Sgblack@eecs.umich.edu * This function is called periodically by an event in M5 and ensures that 467861Sgblack@eecs.umich.edu * at least as much real time has passed between invocations as simulated time. 477861Sgblack@eecs.umich.edu * If not, the function either sleeps, or if the difference is small enough 487861Sgblack@eecs.umich.edu * spin waits. 497861Sgblack@eecs.umich.edu */ 507861Sgblack@eecs.umich.eduvoid 517861Sgblack@eecs.umich.eduRoot::timeSync() 522SN/A{ 537861Sgblack@eecs.umich.edu Time cur_time, diff, period = timeSyncPeriod(); 547861Sgblack@eecs.umich.edu 557861Sgblack@eecs.umich.edu do { 567861Sgblack@eecs.umich.edu cur_time.setTimer(); 577861Sgblack@eecs.umich.edu diff = cur_time - lastTime; 587861Sgblack@eecs.umich.edu Time remainder = period - diff; 597861Sgblack@eecs.umich.edu if (diff < period && remainder > _spinThreshold) { 607861Sgblack@eecs.umich.edu DPRINTF(TimeSync, "Sleeping to sync with real time.\n"); 617861Sgblack@eecs.umich.edu // Sleep until the end of the period, or until a signal. 627861Sgblack@eecs.umich.edu sleep(remainder); 637861Sgblack@eecs.umich.edu // Refresh the current time. 647861Sgblack@eecs.umich.edu cur_time.setTimer(); 657861Sgblack@eecs.umich.edu } 667861Sgblack@eecs.umich.edu } while (diff < period); 677861Sgblack@eecs.umich.edu lastTime = cur_time; 687861Sgblack@eecs.umich.edu schedule(&syncEvent, curTick() + _periodTick); 697861Sgblack@eecs.umich.edu} 707861Sgblack@eecs.umich.edu 717861Sgblack@eecs.umich.eduvoid 727861Sgblack@eecs.umich.eduRoot::timeSyncEnable(bool en) 737861Sgblack@eecs.umich.edu{ 747861Sgblack@eecs.umich.edu if (en == _enabled) 757861Sgblack@eecs.umich.edu return; 767861Sgblack@eecs.umich.edu _enabled = en; 777861Sgblack@eecs.umich.edu if (_enabled) { 787861Sgblack@eecs.umich.edu // Get event going. 797861Sgblack@eecs.umich.edu Tick periods = ((curTick() + _periodTick - 1) / _periodTick); 807861Sgblack@eecs.umich.edu Tick nextPeriod = periods * _periodTick; 817861Sgblack@eecs.umich.edu schedule(&syncEvent, nextPeriod); 827861Sgblack@eecs.umich.edu } else { 837861Sgblack@eecs.umich.edu // Stop event. 847861Sgblack@eecs.umich.edu deschedule(&syncEvent); 857861Sgblack@eecs.umich.edu } 867861Sgblack@eecs.umich.edu} 877861Sgblack@eecs.umich.edu 887861Sgblack@eecs.umich.edu/// Configure the period for time sync events. 897861Sgblack@eecs.umich.eduvoid 907861Sgblack@eecs.umich.eduRoot::timeSyncPeriod(Time newPeriod) 917861Sgblack@eecs.umich.edu{ 927861Sgblack@eecs.umich.edu bool en = timeSyncEnabled(); 937861Sgblack@eecs.umich.edu _period = newPeriod; 947863Sgblack@eecs.umich.edu _periodTick = _period.getTick(); 957861Sgblack@eecs.umich.edu timeSyncEnable(en); 967861Sgblack@eecs.umich.edu} 977861Sgblack@eecs.umich.edu 987861Sgblack@eecs.umich.edu/// Set the threshold for time remaining to spin wait. 997861Sgblack@eecs.umich.eduvoid 1007861Sgblack@eecs.umich.eduRoot::timeSyncSpinThreshold(Time newThreshold) 1017861Sgblack@eecs.umich.edu{ 1027861Sgblack@eecs.umich.edu bool en = timeSyncEnabled(); 1037861Sgblack@eecs.umich.edu _spinThreshold = newThreshold; 1047861Sgblack@eecs.umich.edu timeSyncEnable(en); 1057861Sgblack@eecs.umich.edu} 1067861Sgblack@eecs.umich.edu 10712088Sspwilson2@wisc.eduRoot::Root(RootParams *p) 10812088Sspwilson2@wisc.edu : SimObject(p), _enabled(false), _periodTick(p->time_sync_period), 10912088Sspwilson2@wisc.edu syncEvent([this]{ timeSync(); }, name()) 1107861Sgblack@eecs.umich.edu{ 1117863Sgblack@eecs.umich.edu _period.setTick(p->time_sync_period); 1127863Sgblack@eecs.umich.edu _spinThreshold.setTick(p->time_sync_spin_threshold); 1137861Sgblack@eecs.umich.edu 1147861Sgblack@eecs.umich.edu assert(_root == NULL); 1157861Sgblack@eecs.umich.edu _root = this; 1167861Sgblack@eecs.umich.edu lastTime.setTimer(); 1179983Sstever@gmail.com 1189983Sstever@gmail.com simQuantum = p->sim_quantum; 1197942SAli.Saidi@ARM.com} 1207942SAli.Saidi@ARM.com 1217942SAli.Saidi@ARM.comvoid 12212185Sgabeblack@google.comRoot::startup() 1237942SAli.Saidi@ARM.com{ 1247942SAli.Saidi@ARM.com timeSyncEnable(params()->time_sync_enable); 1257942SAli.Saidi@ARM.com} 1267942SAli.Saidi@ARM.com 1277942SAli.Saidi@ARM.comvoid 12810905Sandreas.sandberg@arm.comRoot::serialize(CheckpointOut &cp) const 1299048SAli.Saidi@ARM.com{ 1309048SAli.Saidi@ARM.com SERIALIZE_SCALAR(FullSystem); 1319048SAli.Saidi@ARM.com std::string isa = THE_ISA_STR; 1329048SAli.Saidi@ARM.com SERIALIZE_SCALAR(isa); 1339048SAli.Saidi@ARM.com} 1349048SAli.Saidi@ARM.com 1359048SAli.Saidi@ARM.com 1368801Sgblack@eecs.umich.edubool FullSystem; 1378901Sandreas.hansson@arm.comunsigned int FullSystemInt; 1388801Sgblack@eecs.umich.edu 1394762Snate@binkert.orgRoot * 1404762Snate@binkert.orgRootParams::create() 1411310SN/A{ 1421388SN/A static bool created = false; 1431388SN/A if (created) 1441388SN/A panic("only one root object allowed!"); 1451388SN/A 1461388SN/A created = true; 1471310SN/A 1488801Sgblack@eecs.umich.edu FullSystem = full_system; 1498901Sandreas.hansson@arm.com FullSystemInt = full_system ? 1 : 0; 1508801Sgblack@eecs.umich.edu 1514762Snate@binkert.org return new Root(this); 1521310SN/A} 153