cpu.cc revision 10913:38dbdeea7f1f
1/* 2 * Copyright (c) 2011-2012, 2014 ARM Limited 3 * Copyright (c) 2013 Advanced Micro Devices, Inc. 4 * All rights reserved 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Copyright (c) 2004-2006 The Regents of The University of Michigan 16 * Copyright (c) 2011 Regents of the University of California 17 * All rights reserved. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions are 21 * met: redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer; 23 * redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution; 26 * neither the name of the copyright holders nor the names of its 27 * contributors may be used to endorse or promote products derived from 28 * this software without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 * 42 * Authors: Kevin Lim 43 * Korey Sewell 44 * Rick Strong 45 */ 46 47#include "arch/kernel_stats.hh" 48#include "config/the_isa.hh" 49#include "cpu/checker/cpu.hh" 50#include "cpu/checker/thread_context.hh" 51#include "cpu/o3/cpu.hh" 52#include "cpu/o3/isa_specific.hh" 53#include "cpu/o3/thread_context.hh" 54#include "cpu/activity.hh" 55#include "cpu/quiesce_event.hh" 56#include "cpu/simple_thread.hh" 57#include "cpu/thread_context.hh" 58#include "debug/Activity.hh" 59#include "debug/Drain.hh" 60#include "debug/O3CPU.hh" 61#include "debug/Quiesce.hh" 62#include "enums/MemoryMode.hh" 63#include "sim/core.hh" 64#include "sim/full_system.hh" 65#include "sim/process.hh" 66#include "sim/stat_control.hh" 67#include "sim/system.hh" 68 69#if THE_ISA == ALPHA_ISA 70#include "arch/alpha/osfpal.hh" 71#include "debug/Activity.hh" 72#endif 73 74struct BaseCPUParams; 75 76using namespace TheISA; 77using namespace std; 78 79BaseO3CPU::BaseO3CPU(BaseCPUParams *params) 80 : BaseCPU(params) 81{ 82} 83 84void 85BaseO3CPU::regStats() 86{ 87 BaseCPU::regStats(); 88} 89 90template<class Impl> 91bool 92FullO3CPU<Impl>::IcachePort::recvTimingResp(PacketPtr pkt) 93{ 94 DPRINTF(O3CPU, "Fetch unit received timing\n"); 95 // We shouldn't ever get a cacheable block in ownership state 96 assert(pkt->req->isUncacheable() || 97 !(pkt->memInhibitAsserted() && !pkt->sharedAsserted())); 98 fetch->processCacheCompletion(pkt); 99 100 return true; 101} 102 103template<class Impl> 104void 105FullO3CPU<Impl>::IcachePort::recvReqRetry() 106{ 107 fetch->recvReqRetry(); 108} 109 110template <class Impl> 111bool 112FullO3CPU<Impl>::DcachePort::recvTimingResp(PacketPtr pkt) 113{ 114 return lsq->recvTimingResp(pkt); 115} 116 117template <class Impl> 118void 119FullO3CPU<Impl>::DcachePort::recvTimingSnoopReq(PacketPtr pkt) 120{ 121 // X86 ISA: Snooping an invalidation for monitor/mwait 122 if(cpu->getCpuAddrMonitor()->doMonitor(pkt)) { 123 cpu->wakeup(); 124 } 125 lsq->recvTimingSnoopReq(pkt); 126} 127 128template <class Impl> 129void 130FullO3CPU<Impl>::DcachePort::recvReqRetry() 131{ 132 lsq->recvReqRetry(); 133} 134 135template <class Impl> 136FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c) 137 : Event(CPU_Tick_Pri), cpu(c) 138{ 139} 140 141template <class Impl> 142void 143FullO3CPU<Impl>::TickEvent::process() 144{ 145 cpu->tick(); 146} 147 148template <class Impl> 149const char * 150FullO3CPU<Impl>::TickEvent::description() const 151{ 152 return "FullO3CPU tick"; 153} 154 155template <class Impl> 156FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params) 157 : BaseO3CPU(params), 158 itb(params->itb), 159 dtb(params->dtb), 160 tickEvent(this), 161#ifndef NDEBUG 162 instcount(0), 163#endif 164 removeInstsThisCycle(false), 165 fetch(this, params), 166 decode(this, params), 167 rename(this, params), 168 iew(this, params), 169 commit(this, params), 170 171 regFile(params->numPhysIntRegs, 172 params->numPhysFloatRegs, 173 params->numPhysCCRegs), 174 175 freeList(name() + ".freelist", ®File), 176 177 rob(this, params), 178 179 scoreboard(name() + ".scoreboard", 180 regFile.totalNumPhysRegs(), TheISA::NumMiscRegs, 181 TheISA::ZeroReg, TheISA::ZeroReg), 182 183 isa(numThreads, NULL), 184 185 icachePort(&fetch, this), 186 dcachePort(&iew.ldstQueue, this), 187 188 timeBuffer(params->backComSize, params->forwardComSize), 189 fetchQueue(params->backComSize, params->forwardComSize), 190 decodeQueue(params->backComSize, params->forwardComSize), 191 renameQueue(params->backComSize, params->forwardComSize), 192 iewQueue(params->backComSize, params->forwardComSize), 193 activityRec(name(), NumStages, 194 params->backComSize + params->forwardComSize, 195 params->activity), 196 197 globalSeqNum(1), 198 system(params->system), 199 lastRunningCycle(curCycle()) 200{ 201 if (!params->switched_out) { 202 _status = Running; 203 } else { 204 _status = SwitchedOut; 205 } 206 207 if (params->checker) { 208 BaseCPU *temp_checker = params->checker; 209 checker = dynamic_cast<Checker<Impl> *>(temp_checker); 210 checker->setIcachePort(&icachePort); 211 checker->setSystem(params->system); 212 } else { 213 checker = NULL; 214 } 215 216 if (!FullSystem) { 217 thread.resize(numThreads); 218 tids.resize(numThreads); 219 } 220 221 // The stages also need their CPU pointer setup. However this 222 // must be done at the upper level CPU because they have pointers 223 // to the upper level CPU, and not this FullO3CPU. 224 225 // Set up Pointers to the activeThreads list for each stage 226 fetch.setActiveThreads(&activeThreads); 227 decode.setActiveThreads(&activeThreads); 228 rename.setActiveThreads(&activeThreads); 229 iew.setActiveThreads(&activeThreads); 230 commit.setActiveThreads(&activeThreads); 231 232 // Give each of the stages the time buffer they will use. 233 fetch.setTimeBuffer(&timeBuffer); 234 decode.setTimeBuffer(&timeBuffer); 235 rename.setTimeBuffer(&timeBuffer); 236 iew.setTimeBuffer(&timeBuffer); 237 commit.setTimeBuffer(&timeBuffer); 238 239 // Also setup each of the stages' queues. 240 fetch.setFetchQueue(&fetchQueue); 241 decode.setFetchQueue(&fetchQueue); 242 commit.setFetchQueue(&fetchQueue); 243 decode.setDecodeQueue(&decodeQueue); 244 rename.setDecodeQueue(&decodeQueue); 245 rename.setRenameQueue(&renameQueue); 246 iew.setRenameQueue(&renameQueue); 247 iew.setIEWQueue(&iewQueue); 248 commit.setIEWQueue(&iewQueue); 249 commit.setRenameQueue(&renameQueue); 250 251 commit.setIEWStage(&iew); 252 rename.setIEWStage(&iew); 253 rename.setCommitStage(&commit); 254 255 ThreadID active_threads; 256 if (FullSystem) { 257 active_threads = 1; 258 } else { 259 active_threads = params->workload.size(); 260 261 if (active_threads > Impl::MaxThreads) { 262 panic("Workload Size too large. Increase the 'MaxThreads' " 263 "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) " 264 "or edit your workload size."); 265 } 266 } 267 268 //Make Sure That this a Valid Architeture 269 assert(params->numPhysIntRegs >= numThreads * TheISA::NumIntRegs); 270 assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs); 271 assert(params->numPhysCCRegs >= numThreads * TheISA::NumCCRegs); 272 273 rename.setScoreboard(&scoreboard); 274 iew.setScoreboard(&scoreboard); 275 276 // Setup the rename map for whichever stages need it. 277 for (ThreadID tid = 0; tid < numThreads; tid++) { 278 isa[tid] = params->isa[tid]; 279 280 // Only Alpha has an FP zero register, so for other ISAs we 281 // use an invalid FP register index to avoid special treatment 282 // of any valid FP reg. 283 RegIndex invalidFPReg = TheISA::NumFloatRegs + 1; 284 RegIndex fpZeroReg = 285 (THE_ISA == ALPHA_ISA) ? TheISA::ZeroReg : invalidFPReg; 286 287 commitRenameMap[tid].init(®File, TheISA::ZeroReg, fpZeroReg, 288 &freeList); 289 290 renameMap[tid].init(®File, TheISA::ZeroReg, fpZeroReg, 291 &freeList); 292 } 293 294 // Initialize rename map to assign physical registers to the 295 // architectural registers for active threads only. 296 for (ThreadID tid = 0; tid < active_threads; tid++) { 297 for (RegIndex ridx = 0; ridx < TheISA::NumIntRegs; ++ridx) { 298 // Note that we can't use the rename() method because we don't 299 // want special treatment for the zero register at this point 300 PhysRegIndex phys_reg = freeList.getIntReg(); 301 renameMap[tid].setIntEntry(ridx, phys_reg); 302 commitRenameMap[tid].setIntEntry(ridx, phys_reg); 303 } 304 305 for (RegIndex ridx = 0; ridx < TheISA::NumFloatRegs; ++ridx) { 306 PhysRegIndex phys_reg = freeList.getFloatReg(); 307 renameMap[tid].setFloatEntry(ridx, phys_reg); 308 commitRenameMap[tid].setFloatEntry(ridx, phys_reg); 309 } 310 311 for (RegIndex ridx = 0; ridx < TheISA::NumCCRegs; ++ridx) { 312 PhysRegIndex phys_reg = freeList.getCCReg(); 313 renameMap[tid].setCCEntry(ridx, phys_reg); 314 commitRenameMap[tid].setCCEntry(ridx, phys_reg); 315 } 316 } 317 318 rename.setRenameMap(renameMap); 319 commit.setRenameMap(commitRenameMap); 320 rename.setFreeList(&freeList); 321 322 // Setup the ROB for whichever stages need it. 323 commit.setROB(&rob); 324 325 lastActivatedCycle = 0; 326#if 0 327 // Give renameMap & rename stage access to the freeList; 328 for (ThreadID tid = 0; tid < numThreads; tid++) 329 globalSeqNum[tid] = 1; 330#endif 331 332 DPRINTF(O3CPU, "Creating O3CPU object.\n"); 333 334 // Setup any thread state. 335 this->thread.resize(this->numThreads); 336 337 for (ThreadID tid = 0; tid < this->numThreads; ++tid) { 338 if (FullSystem) { 339 // SMT is not supported in FS mode yet. 340 assert(this->numThreads == 1); 341 this->thread[tid] = new Thread(this, 0, NULL); 342 } else { 343 if (tid < params->workload.size()) { 344 DPRINTF(O3CPU, "Workload[%i] process is %#x", 345 tid, this->thread[tid]); 346 this->thread[tid] = new typename FullO3CPU<Impl>::Thread( 347 (typename Impl::O3CPU *)(this), 348 tid, params->workload[tid]); 349 350 //usedTids[tid] = true; 351 //threadMap[tid] = tid; 352 } else { 353 //Allocate Empty thread so M5 can use later 354 //when scheduling threads to CPU 355 Process* dummy_proc = NULL; 356 357 this->thread[tid] = new typename FullO3CPU<Impl>::Thread( 358 (typename Impl::O3CPU *)(this), 359 tid, dummy_proc); 360 //usedTids[tid] = false; 361 } 362 } 363 364 ThreadContext *tc; 365 366 // Setup the TC that will serve as the interface to the threads/CPU. 367 O3ThreadContext<Impl> *o3_tc = new O3ThreadContext<Impl>; 368 369 tc = o3_tc; 370 371 // If we're using a checker, then the TC should be the 372 // CheckerThreadContext. 373 if (params->checker) { 374 tc = new CheckerThreadContext<O3ThreadContext<Impl> >( 375 o3_tc, this->checker); 376 } 377 378 o3_tc->cpu = (typename Impl::O3CPU *)(this); 379 assert(o3_tc->cpu); 380 o3_tc->thread = this->thread[tid]; 381 382 if (FullSystem) { 383 // Setup quiesce event. 384 this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc); 385 } 386 // Give the thread the TC. 387 this->thread[tid]->tc = tc; 388 389 // Add the TC to the CPU's list of TC's. 390 this->threadContexts.push_back(tc); 391 } 392 393 // FullO3CPU always requires an interrupt controller. 394 if (!params->switched_out && !interrupts) { 395 fatal("FullO3CPU %s has no interrupt controller.\n" 396 "Ensure createInterruptController() is called.\n", name()); 397 } 398 399 for (ThreadID tid = 0; tid < this->numThreads; tid++) 400 this->thread[tid]->setFuncExeInst(0); 401} 402 403template <class Impl> 404FullO3CPU<Impl>::~FullO3CPU() 405{ 406} 407 408template <class Impl> 409void 410FullO3CPU<Impl>::regProbePoints() 411{ 412 BaseCPU::regProbePoints(); 413 414 ppInstAccessComplete = new ProbePointArg<PacketPtr>(getProbeManager(), "InstAccessComplete"); 415 ppDataAccessComplete = new ProbePointArg<std::pair<DynInstPtr, PacketPtr> >(getProbeManager(), "DataAccessComplete"); 416 417 fetch.regProbePoints(); 418 iew.regProbePoints(); 419 commit.regProbePoints(); 420} 421 422template <class Impl> 423void 424FullO3CPU<Impl>::regStats() 425{ 426 BaseO3CPU::regStats(); 427 428 // Register any of the O3CPU's stats here. 429 timesIdled 430 .name(name() + ".timesIdled") 431 .desc("Number of times that the entire CPU went into an idle state and" 432 " unscheduled itself") 433 .prereq(timesIdled); 434 435 idleCycles 436 .name(name() + ".idleCycles") 437 .desc("Total number of cycles that the CPU has spent unscheduled due " 438 "to idling") 439 .prereq(idleCycles); 440 441 quiesceCycles 442 .name(name() + ".quiesceCycles") 443 .desc("Total number of cycles that CPU has spent quiesced or waiting " 444 "for an interrupt") 445 .prereq(quiesceCycles); 446 447 // Number of Instructions simulated 448 // -------------------------------- 449 // Should probably be in Base CPU but need templated 450 // MaxThreads so put in here instead 451 committedInsts 452 .init(numThreads) 453 .name(name() + ".committedInsts") 454 .desc("Number of Instructions Simulated") 455 .flags(Stats::total); 456 457 committedOps 458 .init(numThreads) 459 .name(name() + ".committedOps") 460 .desc("Number of Ops (including micro ops) Simulated") 461 .flags(Stats::total); 462 463 cpi 464 .name(name() + ".cpi") 465 .desc("CPI: Cycles Per Instruction") 466 .precision(6); 467 cpi = numCycles / committedInsts; 468 469 totalCpi 470 .name(name() + ".cpi_total") 471 .desc("CPI: Total CPI of All Threads") 472 .precision(6); 473 totalCpi = numCycles / sum(committedInsts); 474 475 ipc 476 .name(name() + ".ipc") 477 .desc("IPC: Instructions Per Cycle") 478 .precision(6); 479 ipc = committedInsts / numCycles; 480 481 totalIpc 482 .name(name() + ".ipc_total") 483 .desc("IPC: Total IPC of All Threads") 484 .precision(6); 485 totalIpc = sum(committedInsts) / numCycles; 486 487 this->fetch.regStats(); 488 this->decode.regStats(); 489 this->rename.regStats(); 490 this->iew.regStats(); 491 this->commit.regStats(); 492 this->rob.regStats(); 493 494 intRegfileReads 495 .name(name() + ".int_regfile_reads") 496 .desc("number of integer regfile reads") 497 .prereq(intRegfileReads); 498 499 intRegfileWrites 500 .name(name() + ".int_regfile_writes") 501 .desc("number of integer regfile writes") 502 .prereq(intRegfileWrites); 503 504 fpRegfileReads 505 .name(name() + ".fp_regfile_reads") 506 .desc("number of floating regfile reads") 507 .prereq(fpRegfileReads); 508 509 fpRegfileWrites 510 .name(name() + ".fp_regfile_writes") 511 .desc("number of floating regfile writes") 512 .prereq(fpRegfileWrites); 513 514 ccRegfileReads 515 .name(name() + ".cc_regfile_reads") 516 .desc("number of cc regfile reads") 517 .prereq(ccRegfileReads); 518 519 ccRegfileWrites 520 .name(name() + ".cc_regfile_writes") 521 .desc("number of cc regfile writes") 522 .prereq(ccRegfileWrites); 523 524 miscRegfileReads 525 .name(name() + ".misc_regfile_reads") 526 .desc("number of misc regfile reads") 527 .prereq(miscRegfileReads); 528 529 miscRegfileWrites 530 .name(name() + ".misc_regfile_writes") 531 .desc("number of misc regfile writes") 532 .prereq(miscRegfileWrites); 533} 534 535template <class Impl> 536void 537FullO3CPU<Impl>::tick() 538{ 539 DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n"); 540 assert(!switchedOut()); 541 assert(drainState() != DrainState::Drained); 542 543 ++numCycles; 544 ppCycles->notify(1); 545 546// activity = false; 547 548 //Tick each of the stages 549 fetch.tick(); 550 551 decode.tick(); 552 553 rename.tick(); 554 555 iew.tick(); 556 557 commit.tick(); 558 559 // Now advance the time buffers 560 timeBuffer.advance(); 561 562 fetchQueue.advance(); 563 decodeQueue.advance(); 564 renameQueue.advance(); 565 iewQueue.advance(); 566 567 activityRec.advance(); 568 569 if (removeInstsThisCycle) { 570 cleanUpRemovedInsts(); 571 } 572 573 if (!tickEvent.scheduled()) { 574 if (_status == SwitchedOut) { 575 DPRINTF(O3CPU, "Switched out!\n"); 576 // increment stat 577 lastRunningCycle = curCycle(); 578 } else if (!activityRec.active() || _status == Idle) { 579 DPRINTF(O3CPU, "Idle!\n"); 580 lastRunningCycle = curCycle(); 581 timesIdled++; 582 } else { 583 schedule(tickEvent, clockEdge(Cycles(1))); 584 DPRINTF(O3CPU, "Scheduling next tick!\n"); 585 } 586 } 587 588 if (!FullSystem) 589 updateThreadPriority(); 590 591 tryDrain(); 592} 593 594template <class Impl> 595void 596FullO3CPU<Impl>::init() 597{ 598 BaseCPU::init(); 599 600 for (ThreadID tid = 0; tid < numThreads; ++tid) { 601 // Set noSquashFromTC so that the CPU doesn't squash when initially 602 // setting up registers. 603 thread[tid]->noSquashFromTC = true; 604 // Initialise the ThreadContext's memory proxies 605 thread[tid]->initMemProxies(thread[tid]->getTC()); 606 } 607 608 if (FullSystem && !params()->switched_out) { 609 for (ThreadID tid = 0; tid < numThreads; tid++) { 610 ThreadContext *src_tc = threadContexts[tid]; 611 TheISA::initCPU(src_tc, src_tc->contextId()); 612 } 613 } 614 615 // Clear noSquashFromTC. 616 for (int tid = 0; tid < numThreads; ++tid) 617 thread[tid]->noSquashFromTC = false; 618 619 commit.setThreads(thread); 620} 621 622template <class Impl> 623void 624FullO3CPU<Impl>::startup() 625{ 626 BaseCPU::startup(); 627 for (int tid = 0; tid < numThreads; ++tid) 628 isa[tid]->startup(threadContexts[tid]); 629 630 fetch.startupStage(); 631 decode.startupStage(); 632 iew.startupStage(); 633 rename.startupStage(); 634 commit.startupStage(); 635} 636 637template <class Impl> 638void 639FullO3CPU<Impl>::activateThread(ThreadID tid) 640{ 641 list<ThreadID>::iterator isActive = 642 std::find(activeThreads.begin(), activeThreads.end(), tid); 643 644 DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid); 645 assert(!switchedOut()); 646 647 if (isActive == activeThreads.end()) { 648 DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n", 649 tid); 650 651 activeThreads.push_back(tid); 652 } 653} 654 655template <class Impl> 656void 657FullO3CPU<Impl>::deactivateThread(ThreadID tid) 658{ 659 //Remove From Active List, if Active 660 list<ThreadID>::iterator thread_it = 661 std::find(activeThreads.begin(), activeThreads.end(), tid); 662 663 DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid); 664 assert(!switchedOut()); 665 666 if (thread_it != activeThreads.end()) { 667 DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n", 668 tid); 669 activeThreads.erase(thread_it); 670 } 671 672 fetch.deactivateThread(tid); 673 commit.deactivateThread(tid); 674} 675 676template <class Impl> 677Counter 678FullO3CPU<Impl>::totalInsts() const 679{ 680 Counter total(0); 681 682 ThreadID size = thread.size(); 683 for (ThreadID i = 0; i < size; i++) 684 total += thread[i]->numInst; 685 686 return total; 687} 688 689template <class Impl> 690Counter 691FullO3CPU<Impl>::totalOps() const 692{ 693 Counter total(0); 694 695 ThreadID size = thread.size(); 696 for (ThreadID i = 0; i < size; i++) 697 total += thread[i]->numOp; 698 699 return total; 700} 701 702template <class Impl> 703void 704FullO3CPU<Impl>::activateContext(ThreadID tid) 705{ 706 assert(!switchedOut()); 707 708 // Needs to set each stage to running as well. 709 activateThread(tid); 710 711 // We don't want to wake the CPU if it is drained. In that case, 712 // we just want to flag the thread as active and schedule the tick 713 // event from drainResume() instead. 714 if (drainState() == DrainState::Drained) 715 return; 716 717 // If we are time 0 or if the last activation time is in the past, 718 // schedule the next tick and wake up the fetch unit 719 if (lastActivatedCycle == 0 || lastActivatedCycle < curTick()) { 720 scheduleTickEvent(Cycles(0)); 721 722 // Be sure to signal that there's some activity so the CPU doesn't 723 // deschedule itself. 724 activityRec.activity(); 725 fetch.wakeFromQuiesce(); 726 727 Cycles cycles(curCycle() - lastRunningCycle); 728 // @todo: This is an oddity that is only here to match the stats 729 if (cycles != 0) 730 --cycles; 731 quiesceCycles += cycles; 732 733 lastActivatedCycle = curTick(); 734 735 _status = Running; 736 } 737} 738 739template <class Impl> 740void 741FullO3CPU<Impl>::suspendContext(ThreadID tid) 742{ 743 DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid); 744 assert(!switchedOut()); 745 746 deactivateThread(tid); 747 748 // If this was the last thread then unschedule the tick event. 749 if (activeThreads.size() == 0) { 750 unscheduleTickEvent(); 751 lastRunningCycle = curCycle(); 752 _status = Idle; 753 } 754 755 DPRINTF(Quiesce, "Suspending Context\n"); 756} 757 758template <class Impl> 759void 760FullO3CPU<Impl>::haltContext(ThreadID tid) 761{ 762 //For now, this is the same as deallocate 763 DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid); 764 assert(!switchedOut()); 765 766 deactivateThread(tid); 767 removeThread(tid); 768} 769 770template <class Impl> 771void 772FullO3CPU<Impl>::insertThread(ThreadID tid) 773{ 774 DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU"); 775 // Will change now that the PC and thread state is internal to the CPU 776 // and not in the ThreadContext. 777 ThreadContext *src_tc; 778 if (FullSystem) 779 src_tc = system->threadContexts[tid]; 780 else 781 src_tc = tcBase(tid); 782 783 //Bind Int Regs to Rename Map 784 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) { 785 PhysRegIndex phys_reg = freeList.getIntReg(); 786 787 renameMap[tid].setEntry(ireg,phys_reg); 788 scoreboard.setReg(phys_reg); 789 } 790 791 //Bind Float Regs to Rename Map 792 int max_reg = TheISA::NumIntRegs + TheISA::NumFloatRegs; 793 for (int freg = TheISA::NumIntRegs; freg < max_reg; freg++) { 794 PhysRegIndex phys_reg = freeList.getFloatReg(); 795 796 renameMap[tid].setEntry(freg,phys_reg); 797 scoreboard.setReg(phys_reg); 798 } 799 800 //Bind condition-code Regs to Rename Map 801 max_reg = TheISA::NumIntRegs + TheISA::NumFloatRegs + TheISA::NumCCRegs; 802 for (int creg = TheISA::NumIntRegs + TheISA::NumFloatRegs; 803 creg < max_reg; creg++) { 804 PhysRegIndex phys_reg = freeList.getCCReg(); 805 806 renameMap[tid].setEntry(creg,phys_reg); 807 scoreboard.setReg(phys_reg); 808 } 809 810 //Copy Thread Data Into RegFile 811 //this->copyFromTC(tid); 812 813 //Set PC/NPC/NNPC 814 pcState(src_tc->pcState(), tid); 815 816 src_tc->setStatus(ThreadContext::Active); 817 818 activateContext(tid); 819 820 //Reset ROB/IQ/LSQ Entries 821 commit.rob->resetEntries(); 822 iew.resetEntries(); 823} 824 825template <class Impl> 826void 827FullO3CPU<Impl>::removeThread(ThreadID tid) 828{ 829 DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid); 830 831 // Copy Thread Data From RegFile 832 // If thread is suspended, it might be re-allocated 833 // this->copyToTC(tid); 834 835 836 // @todo: 2-27-2008: Fix how we free up rename mappings 837 // here to alleviate the case for double-freeing registers 838 // in SMT workloads. 839 840 // Unbind Int Regs from Rename Map 841 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) { 842 PhysRegIndex phys_reg = renameMap[tid].lookup(ireg); 843 scoreboard.unsetReg(phys_reg); 844 freeList.addReg(phys_reg); 845 } 846 847 // Unbind Float Regs from Rename Map 848 int max_reg = TheISA::FP_Reg_Base + TheISA::NumFloatRegs; 849 for (int freg = TheISA::FP_Reg_Base; freg < max_reg; freg++) { 850 PhysRegIndex phys_reg = renameMap[tid].lookup(freg); 851 scoreboard.unsetReg(phys_reg); 852 freeList.addReg(phys_reg); 853 } 854 855 // Unbind condition-code Regs from Rename Map 856 max_reg = TheISA::CC_Reg_Base + TheISA::NumCCRegs; 857 for (int creg = TheISA::CC_Reg_Base; creg < max_reg; creg++) { 858 PhysRegIndex phys_reg = renameMap[tid].lookup(creg); 859 scoreboard.unsetReg(phys_reg); 860 freeList.addReg(phys_reg); 861 } 862 863 // Squash Throughout Pipeline 864 DynInstPtr inst = commit.rob->readHeadInst(tid); 865 InstSeqNum squash_seq_num = inst->seqNum; 866 fetch.squash(0, squash_seq_num, inst, tid); 867 decode.squash(tid); 868 rename.squash(squash_seq_num, tid); 869 iew.squash(tid); 870 iew.ldstQueue.squash(squash_seq_num, tid); 871 commit.rob->squash(squash_seq_num, tid); 872 873 874 assert(iew.instQueue.getCount(tid) == 0); 875 assert(iew.ldstQueue.getCount(tid) == 0); 876 877 // Reset ROB/IQ/LSQ Entries 878 879 // Commented out for now. This should be possible to do by 880 // telling all the pipeline stages to drain first, and then 881 // checking until the drain completes. Once the pipeline is 882 // drained, call resetEntries(). - 10-09-06 ktlim 883/* 884 if (activeThreads.size() >= 1) { 885 commit.rob->resetEntries(); 886 iew.resetEntries(); 887 } 888*/ 889} 890 891template <class Impl> 892Fault 893FullO3CPU<Impl>::hwrei(ThreadID tid) 894{ 895#if THE_ISA == ALPHA_ISA 896 // Need to clear the lock flag upon returning from an interrupt. 897 this->setMiscRegNoEffect(AlphaISA::MISCREG_LOCKFLAG, false, tid); 898 899 this->thread[tid]->kernelStats->hwrei(); 900 901 // FIXME: XXX check for interrupts? XXX 902#endif 903 return NoFault; 904} 905 906template <class Impl> 907bool 908FullO3CPU<Impl>::simPalCheck(int palFunc, ThreadID tid) 909{ 910#if THE_ISA == ALPHA_ISA 911 if (this->thread[tid]->kernelStats) 912 this->thread[tid]->kernelStats->callpal(palFunc, 913 this->threadContexts[tid]); 914 915 switch (palFunc) { 916 case PAL::halt: 917 halt(); 918 if (--System::numSystemsRunning == 0) 919 exitSimLoop("all cpus halted"); 920 break; 921 922 case PAL::bpt: 923 case PAL::bugchk: 924 if (this->system->breakpoint()) 925 return false; 926 break; 927 } 928#endif 929 return true; 930} 931 932template <class Impl> 933Fault 934FullO3CPU<Impl>::getInterrupts() 935{ 936 // Check if there are any outstanding interrupts 937 return this->interrupts->getInterrupt(this->threadContexts[0]); 938} 939 940template <class Impl> 941void 942FullO3CPU<Impl>::processInterrupts(const Fault &interrupt) 943{ 944 // Check for interrupts here. For now can copy the code that 945 // exists within isa_fullsys_traits.hh. Also assume that thread 0 946 // is the one that handles the interrupts. 947 // @todo: Possibly consolidate the interrupt checking code. 948 // @todo: Allow other threads to handle interrupts. 949 950 assert(interrupt != NoFault); 951 this->interrupts->updateIntrInfo(this->threadContexts[0]); 952 953 DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name()); 954 this->trap(interrupt, 0, nullptr); 955} 956 957template <class Impl> 958void 959FullO3CPU<Impl>::trap(const Fault &fault, ThreadID tid, 960 const StaticInstPtr &inst) 961{ 962 // Pass the thread's TC into the invoke method. 963 fault->invoke(this->threadContexts[tid], inst); 964} 965 966template <class Impl> 967void 968FullO3CPU<Impl>::syscall(int64_t callnum, ThreadID tid) 969{ 970 DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid); 971 972 DPRINTF(Activity,"Activity: syscall() called.\n"); 973 974 // Temporarily increase this by one to account for the syscall 975 // instruction. 976 ++(this->thread[tid]->funcExeInst); 977 978 // Execute the actual syscall. 979 this->thread[tid]->syscall(callnum); 980 981 // Decrease funcExeInst by one as the normal commit will handle 982 // incrementing it. 983 --(this->thread[tid]->funcExeInst); 984} 985 986template <class Impl> 987void 988FullO3CPU<Impl>::serializeThread(CheckpointOut &cp, ThreadID tid) const 989{ 990 thread[tid]->serialize(cp); 991} 992 993template <class Impl> 994void 995FullO3CPU<Impl>::unserializeThread(CheckpointIn &cp, ThreadID tid) 996{ 997 thread[tid]->unserialize(cp); 998} 999 1000template <class Impl> 1001DrainState 1002FullO3CPU<Impl>::drain() 1003{ 1004 // If the CPU isn't doing anything, then return immediately. 1005 if (switchedOut()) 1006 return DrainState::Drained; 1007 1008 DPRINTF(Drain, "Draining...\n"); 1009 1010 // We only need to signal a drain to the commit stage as this 1011 // initiates squashing controls the draining. Once the commit 1012 // stage commits an instruction where it is safe to stop, it'll 1013 // squash the rest of the instructions in the pipeline and force 1014 // the fetch stage to stall. The pipeline will be drained once all 1015 // in-flight instructions have retired. 1016 commit.drain(); 1017 1018 // Wake the CPU and record activity so everything can drain out if 1019 // the CPU was not able to immediately drain. 1020 if (!isDrained()) { 1021 wakeCPU(); 1022 activityRec.activity(); 1023 1024 DPRINTF(Drain, "CPU not drained\n"); 1025 1026 return DrainState::Draining; 1027 } else { 1028 DPRINTF(Drain, "CPU is already drained\n"); 1029 if (tickEvent.scheduled()) 1030 deschedule(tickEvent); 1031 1032 // Flush out any old data from the time buffers. In 1033 // particular, there might be some data in flight from the 1034 // fetch stage that isn't visible in any of the CPU buffers we 1035 // test in isDrained(). 1036 for (int i = 0; i < timeBuffer.getSize(); ++i) { 1037 timeBuffer.advance(); 1038 fetchQueue.advance(); 1039 decodeQueue.advance(); 1040 renameQueue.advance(); 1041 iewQueue.advance(); 1042 } 1043 1044 drainSanityCheck(); 1045 return DrainState::Drained; 1046 } 1047} 1048 1049template <class Impl> 1050bool 1051FullO3CPU<Impl>::tryDrain() 1052{ 1053 if (drainState() != DrainState::Draining || !isDrained()) 1054 return false; 1055 1056 if (tickEvent.scheduled()) 1057 deschedule(tickEvent); 1058 1059 DPRINTF(Drain, "CPU done draining, processing drain event\n"); 1060 signalDrainDone(); 1061 1062 return true; 1063} 1064 1065template <class Impl> 1066void 1067FullO3CPU<Impl>::drainSanityCheck() const 1068{ 1069 assert(isDrained()); 1070 fetch.drainSanityCheck(); 1071 decode.drainSanityCheck(); 1072 rename.drainSanityCheck(); 1073 iew.drainSanityCheck(); 1074 commit.drainSanityCheck(); 1075} 1076 1077template <class Impl> 1078bool 1079FullO3CPU<Impl>::isDrained() const 1080{ 1081 bool drained(true); 1082 1083 if (!instList.empty() || !removeList.empty()) { 1084 DPRINTF(Drain, "Main CPU structures not drained.\n"); 1085 drained = false; 1086 } 1087 1088 if (!fetch.isDrained()) { 1089 DPRINTF(Drain, "Fetch not drained.\n"); 1090 drained = false; 1091 } 1092 1093 if (!decode.isDrained()) { 1094 DPRINTF(Drain, "Decode not drained.\n"); 1095 drained = false; 1096 } 1097 1098 if (!rename.isDrained()) { 1099 DPRINTF(Drain, "Rename not drained.\n"); 1100 drained = false; 1101 } 1102 1103 if (!iew.isDrained()) { 1104 DPRINTF(Drain, "IEW not drained.\n"); 1105 drained = false; 1106 } 1107 1108 if (!commit.isDrained()) { 1109 DPRINTF(Drain, "Commit not drained.\n"); 1110 drained = false; 1111 } 1112 1113 return drained; 1114} 1115 1116template <class Impl> 1117void 1118FullO3CPU<Impl>::commitDrained(ThreadID tid) 1119{ 1120 fetch.drainStall(tid); 1121} 1122 1123template <class Impl> 1124void 1125FullO3CPU<Impl>::drainResume() 1126{ 1127 if (switchedOut()) 1128 return; 1129 1130 DPRINTF(Drain, "Resuming...\n"); 1131 verifyMemoryMode(); 1132 1133 fetch.drainResume(); 1134 commit.drainResume(); 1135 1136 _status = Idle; 1137 for (ThreadID i = 0; i < thread.size(); i++) { 1138 if (thread[i]->status() == ThreadContext::Active) { 1139 DPRINTF(Drain, "Activating thread: %i\n", i); 1140 activateThread(i); 1141 _status = Running; 1142 } 1143 } 1144 1145 assert(!tickEvent.scheduled()); 1146 if (_status == Running) 1147 schedule(tickEvent, nextCycle()); 1148} 1149 1150template <class Impl> 1151void 1152FullO3CPU<Impl>::switchOut() 1153{ 1154 DPRINTF(O3CPU, "Switching out\n"); 1155 BaseCPU::switchOut(); 1156 1157 activityRec.reset(); 1158 1159 _status = SwitchedOut; 1160 1161 if (checker) 1162 checker->switchOut(); 1163} 1164 1165template <class Impl> 1166void 1167FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU) 1168{ 1169 BaseCPU::takeOverFrom(oldCPU); 1170 1171 fetch.takeOverFrom(); 1172 decode.takeOverFrom(); 1173 rename.takeOverFrom(); 1174 iew.takeOverFrom(); 1175 commit.takeOverFrom(); 1176 1177 assert(!tickEvent.scheduled()); 1178 1179 FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU); 1180 if (oldO3CPU) 1181 globalSeqNum = oldO3CPU->globalSeqNum; 1182 1183 lastRunningCycle = curCycle(); 1184 _status = Idle; 1185} 1186 1187template <class Impl> 1188void 1189FullO3CPU<Impl>::verifyMemoryMode() const 1190{ 1191 if (!system->isTimingMode()) { 1192 fatal("The O3 CPU requires the memory system to be in " 1193 "'timing' mode.\n"); 1194 } 1195} 1196 1197template <class Impl> 1198TheISA::MiscReg 1199FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid) const 1200{ 1201 return this->isa[tid]->readMiscRegNoEffect(misc_reg); 1202} 1203 1204template <class Impl> 1205TheISA::MiscReg 1206FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid) 1207{ 1208 miscRegfileReads++; 1209 return this->isa[tid]->readMiscReg(misc_reg, tcBase(tid)); 1210} 1211 1212template <class Impl> 1213void 1214FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg, 1215 const TheISA::MiscReg &val, ThreadID tid) 1216{ 1217 this->isa[tid]->setMiscRegNoEffect(misc_reg, val); 1218} 1219 1220template <class Impl> 1221void 1222FullO3CPU<Impl>::setMiscReg(int misc_reg, 1223 const TheISA::MiscReg &val, ThreadID tid) 1224{ 1225 miscRegfileWrites++; 1226 this->isa[tid]->setMiscReg(misc_reg, val, tcBase(tid)); 1227} 1228 1229template <class Impl> 1230uint64_t 1231FullO3CPU<Impl>::readIntReg(int reg_idx) 1232{ 1233 intRegfileReads++; 1234 return regFile.readIntReg(reg_idx); 1235} 1236 1237template <class Impl> 1238FloatReg 1239FullO3CPU<Impl>::readFloatReg(int reg_idx) 1240{ 1241 fpRegfileReads++; 1242 return regFile.readFloatReg(reg_idx); 1243} 1244 1245template <class Impl> 1246FloatRegBits 1247FullO3CPU<Impl>::readFloatRegBits(int reg_idx) 1248{ 1249 fpRegfileReads++; 1250 return regFile.readFloatRegBits(reg_idx); 1251} 1252 1253template <class Impl> 1254CCReg 1255FullO3CPU<Impl>::readCCReg(int reg_idx) 1256{ 1257 ccRegfileReads++; 1258 return regFile.readCCReg(reg_idx); 1259} 1260 1261template <class Impl> 1262void 1263FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val) 1264{ 1265 intRegfileWrites++; 1266 regFile.setIntReg(reg_idx, val); 1267} 1268 1269template <class Impl> 1270void 1271FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val) 1272{ 1273 fpRegfileWrites++; 1274 regFile.setFloatReg(reg_idx, val); 1275} 1276 1277template <class Impl> 1278void 1279FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val) 1280{ 1281 fpRegfileWrites++; 1282 regFile.setFloatRegBits(reg_idx, val); 1283} 1284 1285template <class Impl> 1286void 1287FullO3CPU<Impl>::setCCReg(int reg_idx, CCReg val) 1288{ 1289 ccRegfileWrites++; 1290 regFile.setCCReg(reg_idx, val); 1291} 1292 1293template <class Impl> 1294uint64_t 1295FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid) 1296{ 1297 intRegfileReads++; 1298 PhysRegIndex phys_reg = commitRenameMap[tid].lookupInt(reg_idx); 1299 1300 return regFile.readIntReg(phys_reg); 1301} 1302 1303template <class Impl> 1304float 1305FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid) 1306{ 1307 fpRegfileReads++; 1308 PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx); 1309 1310 return regFile.readFloatReg(phys_reg); 1311} 1312 1313template <class Impl> 1314uint64_t 1315FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, ThreadID tid) 1316{ 1317 fpRegfileReads++; 1318 PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx); 1319 1320 return regFile.readFloatRegBits(phys_reg); 1321} 1322 1323template <class Impl> 1324CCReg 1325FullO3CPU<Impl>::readArchCCReg(int reg_idx, ThreadID tid) 1326{ 1327 ccRegfileReads++; 1328 PhysRegIndex phys_reg = commitRenameMap[tid].lookupCC(reg_idx); 1329 1330 return regFile.readCCReg(phys_reg); 1331} 1332 1333template <class Impl> 1334void 1335FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, ThreadID tid) 1336{ 1337 intRegfileWrites++; 1338 PhysRegIndex phys_reg = commitRenameMap[tid].lookupInt(reg_idx); 1339 1340 regFile.setIntReg(phys_reg, val); 1341} 1342 1343template <class Impl> 1344void 1345FullO3CPU<Impl>::setArchFloatReg(int reg_idx, float val, ThreadID tid) 1346{ 1347 fpRegfileWrites++; 1348 PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx); 1349 1350 regFile.setFloatReg(phys_reg, val); 1351} 1352 1353template <class Impl> 1354void 1355FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, ThreadID tid) 1356{ 1357 fpRegfileWrites++; 1358 PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx); 1359 1360 regFile.setFloatRegBits(phys_reg, val); 1361} 1362 1363template <class Impl> 1364void 1365FullO3CPU<Impl>::setArchCCReg(int reg_idx, CCReg val, ThreadID tid) 1366{ 1367 ccRegfileWrites++; 1368 PhysRegIndex phys_reg = commitRenameMap[tid].lookupCC(reg_idx); 1369 1370 regFile.setCCReg(phys_reg, val); 1371} 1372 1373template <class Impl> 1374TheISA::PCState 1375FullO3CPU<Impl>::pcState(ThreadID tid) 1376{ 1377 return commit.pcState(tid); 1378} 1379 1380template <class Impl> 1381void 1382FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid) 1383{ 1384 commit.pcState(val, tid); 1385} 1386 1387template <class Impl> 1388Addr 1389FullO3CPU<Impl>::instAddr(ThreadID tid) 1390{ 1391 return commit.instAddr(tid); 1392} 1393 1394template <class Impl> 1395Addr 1396FullO3CPU<Impl>::nextInstAddr(ThreadID tid) 1397{ 1398 return commit.nextInstAddr(tid); 1399} 1400 1401template <class Impl> 1402MicroPC 1403FullO3CPU<Impl>::microPC(ThreadID tid) 1404{ 1405 return commit.microPC(tid); 1406} 1407 1408template <class Impl> 1409void 1410FullO3CPU<Impl>::squashFromTC(ThreadID tid) 1411{ 1412 this->thread[tid]->noSquashFromTC = true; 1413 this->commit.generateTCEvent(tid); 1414} 1415 1416template <class Impl> 1417typename FullO3CPU<Impl>::ListIt 1418FullO3CPU<Impl>::addInst(DynInstPtr &inst) 1419{ 1420 instList.push_back(inst); 1421 1422 return --(instList.end()); 1423} 1424 1425template <class Impl> 1426void 1427FullO3CPU<Impl>::instDone(ThreadID tid, DynInstPtr &inst) 1428{ 1429 // Keep an instruction count. 1430 if (!inst->isMicroop() || inst->isLastMicroop()) { 1431 thread[tid]->numInst++; 1432 thread[tid]->numInsts++; 1433 committedInsts[tid]++; 1434 system->totalNumInsts++; 1435 1436 // Check for instruction-count-based events. 1437 comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst); 1438 system->instEventQueue.serviceEvents(system->totalNumInsts); 1439 } 1440 thread[tid]->numOp++; 1441 thread[tid]->numOps++; 1442 committedOps[tid]++; 1443 1444 probeInstCommit(inst->staticInst); 1445} 1446 1447template <class Impl> 1448void 1449FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst) 1450{ 1451 DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s " 1452 "[sn:%lli]\n", 1453 inst->threadNumber, inst->pcState(), inst->seqNum); 1454 1455 removeInstsThisCycle = true; 1456 1457 // Remove the front instruction. 1458 removeList.push(inst->getInstListIt()); 1459} 1460 1461template <class Impl> 1462void 1463FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid) 1464{ 1465 DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction" 1466 " list.\n", tid); 1467 1468 ListIt end_it; 1469 1470 bool rob_empty = false; 1471 1472 if (instList.empty()) { 1473 return; 1474 } else if (rob.isEmpty(tid)) { 1475 DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n"); 1476 end_it = instList.begin(); 1477 rob_empty = true; 1478 } else { 1479 end_it = (rob.readTailInst(tid))->getInstListIt(); 1480 DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n"); 1481 } 1482 1483 removeInstsThisCycle = true; 1484 1485 ListIt inst_it = instList.end(); 1486 1487 inst_it--; 1488 1489 // Walk through the instruction list, removing any instructions 1490 // that were inserted after the given instruction iterator, end_it. 1491 while (inst_it != end_it) { 1492 assert(!instList.empty()); 1493 1494 squashInstIt(inst_it, tid); 1495 1496 inst_it--; 1497 } 1498 1499 // If the ROB was empty, then we actually need to remove the first 1500 // instruction as well. 1501 if (rob_empty) { 1502 squashInstIt(inst_it, tid); 1503 } 1504} 1505 1506template <class Impl> 1507void 1508FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid) 1509{ 1510 assert(!instList.empty()); 1511 1512 removeInstsThisCycle = true; 1513 1514 ListIt inst_iter = instList.end(); 1515 1516 inst_iter--; 1517 1518 DPRINTF(O3CPU, "Deleting instructions from instruction " 1519 "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n", 1520 tid, seq_num, (*inst_iter)->seqNum); 1521 1522 while ((*inst_iter)->seqNum > seq_num) { 1523 1524 bool break_loop = (inst_iter == instList.begin()); 1525 1526 squashInstIt(inst_iter, tid); 1527 1528 inst_iter--; 1529 1530 if (break_loop) 1531 break; 1532 } 1533} 1534 1535template <class Impl> 1536inline void 1537FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid) 1538{ 1539 if ((*instIt)->threadNumber == tid) { 1540 DPRINTF(O3CPU, "Squashing instruction, " 1541 "[tid:%i] [sn:%lli] PC %s\n", 1542 (*instIt)->threadNumber, 1543 (*instIt)->seqNum, 1544 (*instIt)->pcState()); 1545 1546 // Mark it as squashed. 1547 (*instIt)->setSquashed(); 1548 1549 // @todo: Formulate a consistent method for deleting 1550 // instructions from the instruction list 1551 // Remove the instruction from the list. 1552 removeList.push(instIt); 1553 } 1554} 1555 1556template <class Impl> 1557void 1558FullO3CPU<Impl>::cleanUpRemovedInsts() 1559{ 1560 while (!removeList.empty()) { 1561 DPRINTF(O3CPU, "Removing instruction, " 1562 "[tid:%i] [sn:%lli] PC %s\n", 1563 (*removeList.front())->threadNumber, 1564 (*removeList.front())->seqNum, 1565 (*removeList.front())->pcState()); 1566 1567 instList.erase(removeList.front()); 1568 1569 removeList.pop(); 1570 } 1571 1572 removeInstsThisCycle = false; 1573} 1574/* 1575template <class Impl> 1576void 1577FullO3CPU<Impl>::removeAllInsts() 1578{ 1579 instList.clear(); 1580} 1581*/ 1582template <class Impl> 1583void 1584FullO3CPU<Impl>::dumpInsts() 1585{ 1586 int num = 0; 1587 1588 ListIt inst_list_it = instList.begin(); 1589 1590 cprintf("Dumping Instruction List\n"); 1591 1592 while (inst_list_it != instList.end()) { 1593 cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n" 1594 "Squashed:%i\n\n", 1595 num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber, 1596 (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(), 1597 (*inst_list_it)->isSquashed()); 1598 inst_list_it++; 1599 ++num; 1600 } 1601} 1602/* 1603template <class Impl> 1604void 1605FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst) 1606{ 1607 iew.wakeDependents(inst); 1608} 1609*/ 1610template <class Impl> 1611void 1612FullO3CPU<Impl>::wakeCPU() 1613{ 1614 if (activityRec.active() || tickEvent.scheduled()) { 1615 DPRINTF(Activity, "CPU already running.\n"); 1616 return; 1617 } 1618 1619 DPRINTF(Activity, "Waking up CPU\n"); 1620 1621 Cycles cycles(curCycle() - lastRunningCycle); 1622 // @todo: This is an oddity that is only here to match the stats 1623 if (cycles > 1) { 1624 --cycles; 1625 idleCycles += cycles; 1626 numCycles += cycles; 1627 ppCycles->notify(cycles); 1628 } 1629 1630 schedule(tickEvent, clockEdge()); 1631} 1632 1633template <class Impl> 1634void 1635FullO3CPU<Impl>::wakeup() 1636{ 1637 if (this->thread[0]->status() != ThreadContext::Suspended) 1638 return; 1639 1640 this->wakeCPU(); 1641 1642 DPRINTF(Quiesce, "Suspended Processor woken\n"); 1643 this->threadContexts[0]->activate(); 1644} 1645 1646template <class Impl> 1647ThreadID 1648FullO3CPU<Impl>::getFreeTid() 1649{ 1650 for (ThreadID tid = 0; tid < numThreads; tid++) { 1651 if (!tids[tid]) { 1652 tids[tid] = true; 1653 return tid; 1654 } 1655 } 1656 1657 return InvalidThreadID; 1658} 1659 1660template <class Impl> 1661void 1662FullO3CPU<Impl>::updateThreadPriority() 1663{ 1664 if (activeThreads.size() > 1) { 1665 //DEFAULT TO ROUND ROBIN SCHEME 1666 //e.g. Move highest priority to end of thread list 1667 list<ThreadID>::iterator list_begin = activeThreads.begin(); 1668 1669 unsigned high_thread = *list_begin; 1670 1671 activeThreads.erase(list_begin); 1672 1673 activeThreads.push_back(high_thread); 1674 } 1675} 1676 1677// Forward declaration of FullO3CPU. 1678template class FullO3CPU<O3CPUImpl>; 1679