cpu.cc revision 10946
1/* 2 * Copyright (c) 2012-2014 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Andrew Bardsley 38 */ 39 40#include "arch/utility.hh" 41#include "cpu/minor/cpu.hh" 42#include "cpu/minor/dyn_inst.hh" 43#include "cpu/minor/fetch1.hh" 44#include "cpu/minor/pipeline.hh" 45#include "debug/Drain.hh" 46#include "debug/MinorCPU.hh" 47#include "debug/Quiesce.hh" 48 49MinorCPU::MinorCPU(MinorCPUParams *params) : 50 BaseCPU(params) 51{ 52 /* This is only written for one thread at the moment */ 53 Minor::MinorThread *thread; 54 55 if (FullSystem) { 56 thread = new Minor::MinorThread(this, 0, params->system, params->itb, 57 params->dtb, params->isa[0]); 58 } else { 59 /* thread_id 0 */ 60 thread = new Minor::MinorThread(this, 0, params->system, 61 params->workload[0], params->itb, params->dtb, params->isa[0]); 62 } 63 64 threads.push_back(thread); 65 66 thread->setStatus(ThreadContext::Halted); 67 68 ThreadContext *tc = thread->getTC(); 69 70 if (params->checker) { 71 fatal("The Minor model doesn't support checking (yet)\n"); 72 } 73 74 threadContexts.push_back(tc); 75 76 Minor::MinorDynInst::init(); 77 78 pipeline = new Minor::Pipeline(*this, *params); 79 activityRecorder = pipeline->getActivityRecorder(); 80} 81 82MinorCPU::~MinorCPU() 83{ 84 delete pipeline; 85 86 for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) { 87 delete threads[thread_id]; 88 } 89} 90 91void 92MinorCPU::init() 93{ 94 BaseCPU::init(); 95 96 if (!params()->switched_out && 97 system->getMemoryMode() != Enums::timing) 98 { 99 fatal("The Minor CPU requires the memory system to be in " 100 "'timing' mode.\n"); 101 } 102 103 /* Initialise the ThreadContext's memory proxies */ 104 for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) { 105 ThreadContext *tc = getContext(thread_id); 106 107 tc->initMemProxies(tc); 108 } 109 110 /* Initialise CPUs (== threads in the ISA) */ 111 if (FullSystem && !params()->switched_out) { 112 for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) 113 { 114 ThreadContext *tc = getContext(thread_id); 115 116 /* Initialize CPU, including PC */ 117 TheISA::initCPU(tc, cpuId()); 118 } 119 } 120} 121 122/** Stats interface from SimObject (by way of BaseCPU) */ 123void 124MinorCPU::regStats() 125{ 126 BaseCPU::regStats(); 127 stats.regStats(name(), *this); 128 pipeline->regStats(); 129} 130 131void 132MinorCPU::serializeThread(CheckpointOut &cp, ThreadID thread_id) const 133{ 134 threads[thread_id]->serialize(cp); 135} 136 137void 138MinorCPU::unserializeThread(CheckpointIn &cp, ThreadID thread_id) 139{ 140 if (thread_id != 0) 141 fatal("Trying to load more than one thread into a MinorCPU\n"); 142 143 threads[thread_id]->unserialize(cp); 144} 145 146void 147MinorCPU::serialize(CheckpointOut &cp) const 148{ 149 pipeline->serialize(cp); 150 BaseCPU::serialize(cp); 151} 152 153void 154MinorCPU::unserialize(CheckpointIn &cp) 155{ 156 pipeline->unserialize(cp); 157 BaseCPU::unserialize(cp); 158} 159 160Addr 161MinorCPU::dbg_vtophys(Addr addr) 162{ 163 /* Note that this gives you the translation for thread 0 */ 164 panic("No implementation for vtophy\n"); 165 166 return 0; 167} 168 169void 170MinorCPU::wakeup() 171{ 172 DPRINTF(Drain, "MinorCPU wakeup\n"); 173 174 for (auto i = threads.begin(); i != threads.end(); i ++) { 175 if ((*i)->status() == ThreadContext::Suspended) 176 (*i)->activate(); 177 } 178 179 DPRINTF(Drain,"Suspended Processor awoke\n"); 180} 181 182void 183MinorCPU::startup() 184{ 185 DPRINTF(MinorCPU, "MinorCPU startup\n"); 186 187 BaseCPU::startup(); 188 189 for (auto i = threads.begin(); i != threads.end(); i ++) 190 (*i)->startup(); 191 192 /* Workaround cases in SE mode where a thread is activated with an 193 * incorrect PC that is updated after the call to activate. This 194 * causes problems for Minor since it instantiates a virtual 195 * branch instruction when activateContext() is called which ends 196 * up pointing to an illegal address. */ 197 if (threads[0]->status() == ThreadContext::Active) 198 activateContext(0); 199} 200 201DrainState 202MinorCPU::drain() 203{ 204 DPRINTF(Drain, "MinorCPU drain\n"); 205 206 /* Need to suspend all threads and wait for Execute to idle. 207 * Tell Fetch1 not to fetch */ 208 if (pipeline->drain()) { 209 DPRINTF(Drain, "MinorCPU drained\n"); 210 return DrainState::Drained; 211 } else { 212 DPRINTF(Drain, "MinorCPU not finished draining\n"); 213 return DrainState::Draining; 214 } 215} 216 217void 218MinorCPU::signalDrainDone() 219{ 220 DPRINTF(Drain, "MinorCPU drain done\n"); 221 Drainable::signalDrainDone(); 222} 223 224void 225MinorCPU::drainResume() 226{ 227 if (switchedOut()) { 228 DPRINTF(Drain, "drainResume while switched out. Ignoring\n"); 229 return; 230 } 231 232 DPRINTF(Drain, "MinorCPU drainResume\n"); 233 234 if (!system->isTimingMode()) { 235 fatal("The Minor CPU requires the memory system to be in " 236 "'timing' mode.\n"); 237 } 238 239 wakeup(); 240 pipeline->drainResume(); 241} 242 243void 244MinorCPU::memWriteback() 245{ 246 DPRINTF(Drain, "MinorCPU memWriteback\n"); 247} 248 249void 250MinorCPU::switchOut() 251{ 252 DPRINTF(MinorCPU, "MinorCPU switchOut\n"); 253 254 assert(!switchedOut()); 255 BaseCPU::switchOut(); 256 257 /* Check that the CPU is drained? */ 258 activityRecorder->reset(); 259} 260 261void 262MinorCPU::takeOverFrom(BaseCPU *old_cpu) 263{ 264 DPRINTF(MinorCPU, "MinorCPU takeOverFrom\n"); 265 266 BaseCPU::takeOverFrom(old_cpu); 267 268 /* Don't think I need to do anything here */ 269} 270 271void 272MinorCPU::activateContext(ThreadID thread_id) 273{ 274 DPRINTF(MinorCPU, "ActivateContext thread: %d", thread_id); 275 276 /* Do some cycle accounting. lastStopped is reset to stop the 277 * wakeup call on the pipeline from adding the quiesce period 278 * to BaseCPU::numCycles */ 279 stats.quiesceCycles += pipeline->cyclesSinceLastStopped(); 280 pipeline->resetLastStopped(); 281 282 /* Wake up the thread, wakeup the pipeline tick */ 283 threads[thread_id]->activate(); 284 wakeupOnEvent(Minor::Pipeline::CPUStageId); 285 pipeline->wakeupFetch(); 286} 287 288void 289MinorCPU::suspendContext(ThreadID thread_id) 290{ 291 DPRINTF(MinorCPU, "SuspendContext %d\n", thread_id); 292 293 threads[thread_id]->suspend(); 294} 295 296void 297MinorCPU::wakeupOnEvent(unsigned int stage_id) 298{ 299 DPRINTF(Quiesce, "Event wakeup from stage %d\n", stage_id); 300 301 /* Mark that some activity has taken place and start the pipeline */ 302 activityRecorder->activateStage(stage_id); 303 pipeline->start(); 304} 305 306MinorCPU * 307MinorCPUParams::create() 308{ 309 numThreads = 1; 310 if (!FullSystem && workload.size() != 1) 311 panic("only one workload allowed"); 312 return new MinorCPU(this); 313} 314 315MasterPort &MinorCPU::getInstPort() 316{ 317 return pipeline->getInstPort(); 318} 319 320MasterPort &MinorCPU::getDataPort() 321{ 322 return pipeline->getDataPort(); 323} 324 325Counter 326MinorCPU::totalInsts() const 327{ 328 Counter ret = 0; 329 330 for (auto i = threads.begin(); i != threads.end(); i ++) 331 ret += (*i)->numInst; 332 333 return ret; 334} 335 336Counter 337MinorCPU::totalOps() const 338{ 339 Counter ret = 0; 340 341 for (auto i = threads.begin(); i != threads.end(); i ++) 342 ret += (*i)->numOp; 343 344 return ret; 345} 346