1/* 2 * Copyright (c) 2011 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 * Copyright (c) 2002-2005 The Regents of The University of Michigan 15 * Copyright (c) 2011 Regents of the University of California 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Steve Reinhardt 42 * Nathan Binkert 43 * Rick Strong 44 */ 45 46#include <iostream> 47#include <sstream> 48#include <string> 49 50#include "arch/tlb.hh" 51#include "base/loader/symtab.hh" 52#include "base/cprintf.hh" 53#include "base/misc.hh" 54#include "base/output.hh" 55#include "base/trace.hh" 56#include "config/use_checker.hh" 57#include "cpu/base.hh" 58#include "cpu/cpuevent.hh" 59#include "cpu/profile.hh" 60#include "cpu/thread_context.hh" 61#include "debug/SyscallVerbose.hh" 62#include "params/BaseCPU.hh" 63#include "sim/full_system.hh" 64#include "sim/process.hh" 65#include "sim/sim_events.hh" 66#include "sim/sim_exit.hh" 67#include "sim/system.hh" 68 69#if USE_CHECKER 70#include "cpu/checker/cpu.hh" 71#endif 72 73// Hack 74#include "sim/stat_control.hh" 75 76using namespace std; 77 78vector<BaseCPU *> BaseCPU::cpuList; 79 80// This variable reflects the max number of threads in any CPU. Be 81// careful to only use it once all the CPUs that you care about have 82// been initialized 83int maxThreadsPerCPU = 1; 84 85CPUProgressEvent::CPUProgressEvent(BaseCPU *_cpu, Tick ival) 86 : Event(Event::Progress_Event_Pri), _interval(ival), lastNumInst(0), 87 cpu(_cpu), _repeatEvent(true) 88{ 89 if (_interval) 90 cpu->schedule(this, curTick() + _interval); 91} 92 93void 94CPUProgressEvent::process() 95{ 96 Counter temp = cpu->totalOps(); 97#ifndef NDEBUG 98 double ipc = double(temp - lastNumInst) / (_interval / cpu->ticks(1)); 99 100 DPRINTFN("%s progress event, total committed:%i, progress insts committed: " 101 "%lli, IPC: %0.8d\n", cpu->name(), temp, temp - lastNumInst, 102 ipc); 103 ipc = 0.0; 104#else 105 cprintf("%lli: %s progress event, total committed:%i, progress insts " 106 "committed: %lli\n", curTick(), cpu->name(), temp, 107 temp - lastNumInst); 108#endif 109 lastNumInst = temp; 110 111 if (_repeatEvent) 112 cpu->schedule(this, curTick() + _interval); 113} 114 115const char * 116CPUProgressEvent::description() const 117{ 118 return "CPU Progress"; 119} 120
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121BaseCPU::BaseCPU(Params *p)
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121BaseCPU::BaseCPU(Params *p, bool is_checker) |
122 : MemObject(p), clock(p->clock), instCnt(0), _cpuId(p->cpu_id), 123 _instMasterId(p->system->getMasterId(name() + ".inst")), 124 _dataMasterId(p->system->getMasterId(name() + ".data")), 125 interrupts(p->interrupts), 126 numThreads(p->numThreads), system(p->system), 127 phase(p->phase) 128{ 129// currentTick = curTick(); 130 131 // if Python did not provide a valid ID, do it here 132 if (_cpuId == -1 ) { 133 _cpuId = cpuList.size(); 134 } 135 136 // add self to global list of CPUs 137 cpuList.push_back(this); 138 139 DPRINTF(SyscallVerbose, "Constructing CPU with id %d\n", _cpuId); 140 141 if (numThreads > maxThreadsPerCPU) 142 maxThreadsPerCPU = numThreads; 143 144 // allocate per-thread instruction-based event queues 145 comInstEventQueue = new EventQueue *[numThreads]; 146 for (ThreadID tid = 0; tid < numThreads; ++tid) 147 comInstEventQueue[tid] = 148 new EventQueue("instruction-based event queue"); 149 150 // 151 // set up instruction-count-based termination events, if any 152 // 153 if (p->max_insts_any_thread != 0) { 154 const char *cause = "a thread reached the max instruction count"; 155 for (ThreadID tid = 0; tid < numThreads; ++tid) { 156 Event *event = new SimLoopExitEvent(cause, 0); 157 comInstEventQueue[tid]->schedule(event, p->max_insts_any_thread); 158 } 159 } 160 161 if (p->max_insts_all_threads != 0) { 162 const char *cause = "all threads reached the max instruction count"; 163 164 // allocate & initialize shared downcounter: each event will 165 // decrement this when triggered; simulation will terminate 166 // when counter reaches 0 167 int *counter = new int; 168 *counter = numThreads; 169 for (ThreadID tid = 0; tid < numThreads; ++tid) { 170 Event *event = new CountedExitEvent(cause, *counter); 171 comInstEventQueue[tid]->schedule(event, p->max_insts_all_threads); 172 } 173 } 174 175 // allocate per-thread load-based event queues 176 comLoadEventQueue = new EventQueue *[numThreads]; 177 for (ThreadID tid = 0; tid < numThreads; ++tid) 178 comLoadEventQueue[tid] = new EventQueue("load-based event queue"); 179 180 // 181 // set up instruction-count-based termination events, if any 182 // 183 if (p->max_loads_any_thread != 0) { 184 const char *cause = "a thread reached the max load count"; 185 for (ThreadID tid = 0; tid < numThreads; ++tid) { 186 Event *event = new SimLoopExitEvent(cause, 0); 187 comLoadEventQueue[tid]->schedule(event, p->max_loads_any_thread); 188 } 189 } 190 191 if (p->max_loads_all_threads != 0) { 192 const char *cause = "all threads reached the max load count"; 193 // allocate & initialize shared downcounter: each event will 194 // decrement this when triggered; simulation will terminate 195 // when counter reaches 0 196 int *counter = new int; 197 *counter = numThreads; 198 for (ThreadID tid = 0; tid < numThreads; ++tid) { 199 Event *event = new CountedExitEvent(cause, *counter); 200 comLoadEventQueue[tid]->schedule(event, p->max_loads_all_threads); 201 } 202 } 203 204 functionTracingEnabled = false; 205 if (p->function_trace) { 206 const string fname = csprintf("ftrace.%s", name()); 207 functionTraceStream = simout.find(fname); 208 if (!functionTraceStream) 209 functionTraceStream = simout.create(fname); 210 211 currentFunctionStart = currentFunctionEnd = 0; 212 functionEntryTick = p->function_trace_start; 213 214 if (p->function_trace_start == 0) { 215 functionTracingEnabled = true; 216 } else { 217 typedef EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace> wrap; 218 Event *event = new wrap(this, true); 219 schedule(event, p->function_trace_start); 220 } 221 }
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222 // Check if CPU model has interrupts connected. The CheckerCPU
223 // cannot take interrupts directly for example.
224 if (interrupts)
225 interrupts->setCPU(this);
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222
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223 // The interrupts should always be present unless this CPU is 224 // switched in later or in case it is a checker CPU 225 if (!params()->defer_registration && !is_checker) { 226 if (interrupts) { 227 interrupts->setCPU(this); 228 } else { 229 fatal("CPU %s has no interrupt controller.\n" 230 "Ensure createInterruptController() is called.\n", name()); 231 } 232 } 233 |
234 if (FullSystem) { 235 profileEvent = NULL; 236 if (params()->profile) 237 profileEvent = new ProfileEvent(this, params()->profile); 238 } 239 tracer = params()->tracer; 240} 241 242void 243BaseCPU::enableFunctionTrace() 244{ 245 functionTracingEnabled = true; 246} 247 248BaseCPU::~BaseCPU() 249{ 250} 251 252void 253BaseCPU::init() 254{ 255 if (!params()->defer_registration) 256 registerThreadContexts(); 257} 258 259void 260BaseCPU::startup() 261{ 262 if (FullSystem) { 263 if (!params()->defer_registration && profileEvent) 264 schedule(profileEvent, curTick()); 265 } 266 267 if (params()->progress_interval) { 268 Tick num_ticks = ticks(params()->progress_interval); 269 270 new CPUProgressEvent(this, num_ticks); 271 } 272} 273 274 275void 276BaseCPU::regStats() 277{ 278 using namespace Stats; 279 280 numCycles 281 .name(name() + ".numCycles") 282 .desc("number of cpu cycles simulated") 283 ; 284 285 numWorkItemsStarted 286 .name(name() + ".numWorkItemsStarted") 287 .desc("number of work items this cpu started") 288 ; 289 290 numWorkItemsCompleted 291 .name(name() + ".numWorkItemsCompleted") 292 .desc("number of work items this cpu completed") 293 ; 294 295 int size = threadContexts.size(); 296 if (size > 1) { 297 for (int i = 0; i < size; ++i) { 298 stringstream namestr; 299 ccprintf(namestr, "%s.ctx%d", name(), i); 300 threadContexts[i]->regStats(namestr.str()); 301 } 302 } else if (size == 1) 303 threadContexts[0]->regStats(name()); 304} 305 306Port * 307BaseCPU::getPort(const string &if_name, int idx) 308{ 309 // Get the right port based on name. This applies to all the 310 // subclasses of the base CPU and relies on their implementation 311 // of getDataPort and getInstPort. In all cases there methods 312 // return a CpuPort pointer. 313 if (if_name == "dcache_port") 314 return &getDataPort(); 315 else if (if_name == "icache_port") 316 return &getInstPort(); 317 else 318 panic("CPU %s has no port named %s\n", name(), if_name); 319} 320 321Tick 322BaseCPU::nextCycle() 323{ 324 Tick next_tick = curTick() - phase + clock - 1; 325 next_tick -= (next_tick % clock); 326 next_tick += phase; 327 return next_tick; 328} 329 330Tick 331BaseCPU::nextCycle(Tick begin_tick) 332{ 333 Tick next_tick = begin_tick; 334 if (next_tick % clock != 0) 335 next_tick = next_tick - (next_tick % clock) + clock; 336 next_tick += phase; 337 338 assert(next_tick >= curTick()); 339 return next_tick; 340} 341 342void 343BaseCPU::registerThreadContexts() 344{ 345 ThreadID size = threadContexts.size(); 346 for (ThreadID tid = 0; tid < size; ++tid) { 347 ThreadContext *tc = threadContexts[tid]; 348 349 /** This is so that contextId and cpuId match where there is a 350 * 1cpu:1context relationship. Otherwise, the order of registration 351 * could affect the assignment and cpu 1 could have context id 3, for 352 * example. We may even want to do something like this for SMT so that 353 * cpu 0 has the lowest thread contexts and cpu N has the highest, but 354 * I'll just do this for now 355 */ 356 if (numThreads == 1) 357 tc->setContextId(system->registerThreadContext(tc, _cpuId)); 358 else 359 tc->setContextId(system->registerThreadContext(tc)); 360 361 if (!FullSystem) 362 tc->getProcessPtr()->assignThreadContext(tc->contextId()); 363 } 364} 365 366 367int 368BaseCPU::findContext(ThreadContext *tc) 369{ 370 ThreadID size = threadContexts.size(); 371 for (ThreadID tid = 0; tid < size; ++tid) { 372 if (tc == threadContexts[tid]) 373 return tid; 374 } 375 return 0; 376} 377 378void 379BaseCPU::switchOut() 380{ 381 if (profileEvent && profileEvent->scheduled()) 382 deschedule(profileEvent); 383} 384 385void 386BaseCPU::takeOverFrom(BaseCPU *oldCPU) 387{ 388 CpuPort &ic = getInstPort(); 389 CpuPort &dc = getDataPort(); 390 assert(threadContexts.size() == oldCPU->threadContexts.size()); 391 392 _cpuId = oldCPU->cpuId(); 393 394 ThreadID size = threadContexts.size(); 395 for (ThreadID i = 0; i < size; ++i) { 396 ThreadContext *newTC = threadContexts[i]; 397 ThreadContext *oldTC = oldCPU->threadContexts[i]; 398 399 newTC->takeOverFrom(oldTC); 400 401 CpuEvent::replaceThreadContext(oldTC, newTC); 402 403 assert(newTC->contextId() == oldTC->contextId()); 404 assert(newTC->threadId() == oldTC->threadId()); 405 system->replaceThreadContext(newTC, newTC->contextId()); 406 407 /* This code no longer works since the zero register (e.g., 408 * r31 on Alpha) doesn't necessarily contain zero at this 409 * point. 410 if (DTRACE(Context)) 411 ThreadContext::compare(oldTC, newTC); 412 */ 413 414 Port *old_itb_port, *old_dtb_port, *new_itb_port, *new_dtb_port; 415 old_itb_port = oldTC->getITBPtr()->getPort(); 416 old_dtb_port = oldTC->getDTBPtr()->getPort(); 417 new_itb_port = newTC->getITBPtr()->getPort(); 418 new_dtb_port = newTC->getDTBPtr()->getPort(); 419 420 // Move over any table walker ports if they exist 421 if (new_itb_port && !new_itb_port->isConnected()) { 422 assert(old_itb_port); 423 Port *peer = old_itb_port->getPeer();; 424 new_itb_port->setPeer(peer); 425 peer->setPeer(new_itb_port); 426 } 427 if (new_dtb_port && !new_dtb_port->isConnected()) { 428 assert(old_dtb_port); 429 Port *peer = old_dtb_port->getPeer();; 430 new_dtb_port->setPeer(peer); 431 peer->setPeer(new_dtb_port); 432 } 433 434#if USE_CHECKER 435 Port *old_checker_itb_port, *old_checker_dtb_port; 436 Port *new_checker_itb_port, *new_checker_dtb_port; 437 438 CheckerCPU *oldChecker = 439 dynamic_cast<CheckerCPU*>(oldTC->getCheckerCpuPtr()); 440 CheckerCPU *newChecker = 441 dynamic_cast<CheckerCPU*>(newTC->getCheckerCpuPtr()); 442 old_checker_itb_port = oldChecker->getITBPtr()->getPort(); 443 old_checker_dtb_port = oldChecker->getDTBPtr()->getPort(); 444 new_checker_itb_port = newChecker->getITBPtr()->getPort(); 445 new_checker_dtb_port = newChecker->getDTBPtr()->getPort(); 446 447 // Move over any table walker ports if they exist for checker 448 if (new_checker_itb_port && !new_checker_itb_port->isConnected()) { 449 assert(old_checker_itb_port); 450 Port *peer = old_checker_itb_port->getPeer();; 451 new_checker_itb_port->setPeer(peer); 452 peer->setPeer(new_checker_itb_port); 453 } 454 if (new_checker_dtb_port && !new_checker_dtb_port->isConnected()) { 455 assert(old_checker_dtb_port); 456 Port *peer = old_checker_dtb_port->getPeer();; 457 new_checker_dtb_port->setPeer(peer); 458 peer->setPeer(new_checker_dtb_port); 459 } 460#endif 461 462 } 463 464 interrupts = oldCPU->interrupts; 465 interrupts->setCPU(this); 466 467 if (FullSystem) { 468 for (ThreadID i = 0; i < size; ++i) 469 threadContexts[i]->profileClear(); 470 471 if (profileEvent) 472 schedule(profileEvent, curTick()); 473 } 474 475 // Connect new CPU to old CPU's memory only if new CPU isn't 476 // connected to anything. Also connect old CPU's memory to new 477 // CPU. 478 if (!ic.isConnected()) { 479 Port *peer = oldCPU->getInstPort().getPeer(); 480 ic.setPeer(peer); 481 peer->setPeer(&ic); 482 } 483 484 if (!dc.isConnected()) { 485 Port *peer = oldCPU->getDataPort().getPeer(); 486 dc.setPeer(peer); 487 peer->setPeer(&dc); 488 } 489} 490 491 492BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, Tick _interval) 493 : cpu(_cpu), interval(_interval) 494{ } 495 496void 497BaseCPU::ProfileEvent::process() 498{ 499 ThreadID size = cpu->threadContexts.size(); 500 for (ThreadID i = 0; i < size; ++i) { 501 ThreadContext *tc = cpu->threadContexts[i]; 502 tc->profileSample(); 503 } 504 505 cpu->schedule(this, curTick() + interval); 506} 507 508void 509BaseCPU::serialize(std::ostream &os) 510{ 511 SERIALIZE_SCALAR(instCnt); 512 interrupts->serialize(os); 513} 514 515void 516BaseCPU::unserialize(Checkpoint *cp, const std::string §ion) 517{ 518 UNSERIALIZE_SCALAR(instCnt); 519 interrupts->unserialize(cp, section); 520} 521 522void 523BaseCPU::traceFunctionsInternal(Addr pc) 524{ 525 if (!debugSymbolTable) 526 return; 527 528 // if pc enters different function, print new function symbol and 529 // update saved range. Otherwise do nothing. 530 if (pc < currentFunctionStart || pc >= currentFunctionEnd) { 531 string sym_str; 532 bool found = debugSymbolTable->findNearestSymbol(pc, sym_str, 533 currentFunctionStart, 534 currentFunctionEnd); 535 536 if (!found) { 537 // no symbol found: use addr as label 538 sym_str = csprintf("0x%x", pc); 539 currentFunctionStart = pc; 540 currentFunctionEnd = pc + 1; 541 } 542 543 ccprintf(*functionTraceStream, " (%d)\n%d: %s", 544 curTick() - functionEntryTick, curTick(), sym_str); 545 functionEntryTick = curTick(); 546 } 547} 548 549bool 550BaseCPU::CpuPort::recvTiming(PacketPtr pkt) 551{ 552 panic("BaseCPU doesn't expect recvTiming callback!"); 553 return true; 554} 555 556void 557BaseCPU::CpuPort::recvRetry() 558{ 559 panic("BaseCPU doesn't expect recvRetry callback!"); 560} 561 562Tick 563BaseCPU::CpuPort::recvAtomic(PacketPtr pkt) 564{ 565 panic("BaseCPU doesn't expect recvAtomic callback!"); 566 return curTick(); 567} 568 569void 570BaseCPU::CpuPort::recvFunctional(PacketPtr pkt) 571{ 572 // No internal storage to update (in the general case). In the 573 // long term this should never be called, but that assumed a split 574 // into master/slave and request/response. 575} 576 577void 578BaseCPU::CpuPort::recvRangeChange() 579{ 580}
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