cpu.cc revision 5100
1/* 2 * Copyright (c) 2004-2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Kevin Lim 29 * Korey Sewell 30 */ 31 32#include "config/full_system.hh" 33#include "config/use_checker.hh" 34 35#include "cpu/activity.hh" 36#include "cpu/simple_thread.hh" 37#include "cpu/thread_context.hh" 38#include "cpu/o3/isa_specific.hh" 39#include "cpu/o3/cpu.hh" 40#include "enums/MemoryMode.hh" 41#include "sim/core.hh" 42#include "sim/stat_control.hh" 43 44#if FULL_SYSTEM 45#include "cpu/quiesce_event.hh" 46#include "sim/system.hh" 47#else 48#include "sim/process.hh" 49#endif 50 51#if USE_CHECKER 52#include "cpu/checker/cpu.hh" 53#endif 54 55using namespace std; 56using namespace TheISA; 57 58BaseO3CPU::BaseO3CPU(Params *params) 59 : BaseCPU(params), cpu_id(0) 60{ 61} 62 63void 64BaseO3CPU::regStats() 65{ 66 BaseCPU::regStats(); 67} 68 69template <class Impl> 70FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c) 71 : Event(&mainEventQueue, CPU_Tick_Pri), cpu(c) 72{ 73} 74 75template <class Impl> 76void 77FullO3CPU<Impl>::TickEvent::process() 78{ 79 cpu->tick(); 80} 81 82template <class Impl> 83const char * 84FullO3CPU<Impl>::TickEvent::description() 85{ 86 return "FullO3CPU tick"; 87} 88 89template <class Impl> 90FullO3CPU<Impl>::ActivateThreadEvent::ActivateThreadEvent() 91 : Event(&mainEventQueue, CPU_Switch_Pri) 92{ 93} 94 95template <class Impl> 96void 97FullO3CPU<Impl>::ActivateThreadEvent::init(int thread_num, 98 FullO3CPU<Impl> *thread_cpu) 99{ 100 tid = thread_num; 101 cpu = thread_cpu; 102} 103 104template <class Impl> 105void 106FullO3CPU<Impl>::ActivateThreadEvent::process() 107{ 108 cpu->activateThread(tid); 109} 110 111template <class Impl> 112const char * 113FullO3CPU<Impl>::ActivateThreadEvent::description() 114{ 115 return "FullO3CPU \"Activate Thread\""; 116} 117 118template <class Impl> 119FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent() 120 : Event(&mainEventQueue, CPU_Tick_Pri), tid(0), remove(false), cpu(NULL) 121{ 122} 123 124template <class Impl> 125void 126FullO3CPU<Impl>::DeallocateContextEvent::init(int thread_num, 127 FullO3CPU<Impl> *thread_cpu) 128{ 129 tid = thread_num; 130 cpu = thread_cpu; 131 remove = false; 132} 133 134template <class Impl> 135void 136FullO3CPU<Impl>::DeallocateContextEvent::process() 137{ 138 cpu->deactivateThread(tid); 139 if (remove) 140 cpu->removeThread(tid); 141} 142 143template <class Impl> 144const char * 145FullO3CPU<Impl>::DeallocateContextEvent::description() 146{ 147 return "FullO3CPU \"Deallocate Context\""; 148} 149 150template <class Impl> 151FullO3CPU<Impl>::FullO3CPU(O3CPU *o3_cpu, Params *params) 152 : BaseO3CPU(params), 153 itb(params->itb), 154 dtb(params->dtb), 155 tickEvent(this), 156 removeInstsThisCycle(false), 157 fetch(o3_cpu, params), 158 decode(o3_cpu, params), 159 rename(o3_cpu, params), 160 iew(o3_cpu, params), 161 commit(o3_cpu, params), 162 163 regFile(o3_cpu, params->numPhysIntRegs, 164 params->numPhysFloatRegs), 165 166 freeList(params->numberOfThreads, 167 TheISA::NumIntRegs, params->numPhysIntRegs, 168 TheISA::NumFloatRegs, params->numPhysFloatRegs), 169 170 rob(o3_cpu, 171 params->numROBEntries, params->squashWidth, 172 params->smtROBPolicy, params->smtROBThreshold, 173 params->numberOfThreads), 174 175 scoreboard(params->numberOfThreads, 176 TheISA::NumIntRegs, params->numPhysIntRegs, 177 TheISA::NumFloatRegs, params->numPhysFloatRegs, 178 TheISA::NumMiscRegs * number_of_threads, 179 TheISA::ZeroReg), 180 181 timeBuffer(params->backComSize, params->forwardComSize), 182 fetchQueue(params->backComSize, params->forwardComSize), 183 decodeQueue(params->backComSize, params->forwardComSize), 184 renameQueue(params->backComSize, params->forwardComSize), 185 iewQueue(params->backComSize, params->forwardComSize), 186 activityRec(NumStages, 187 params->backComSize + params->forwardComSize, 188 params->activity), 189 190 globalSeqNum(1), 191#if FULL_SYSTEM 192 system(params->system), 193 physmem(system->physmem), 194#endif // FULL_SYSTEM 195 drainCount(0), 196 deferRegistration(params->deferRegistration), 197 numThreads(number_of_threads) 198{ 199 if (!deferRegistration) { 200 _status = Running; 201 } else { 202 _status = Idle; 203 } 204 205#if USE_CHECKER 206 if (params->checker) { 207 BaseCPU *temp_checker = params->checker; 208 checker = dynamic_cast<Checker<DynInstPtr> *>(temp_checker); 209#if FULL_SYSTEM 210 checker->setSystem(params->system); 211#endif 212 } else { 213 checker = NULL; 214 } 215#endif // USE_CHECKER 216 217#if !FULL_SYSTEM 218 thread.resize(number_of_threads); 219 tids.resize(number_of_threads); 220#endif 221 222 // The stages also need their CPU pointer setup. However this 223 // must be done at the upper level CPU because they have pointers 224 // to the upper level CPU, and not this FullO3CPU. 225 226 // Set up Pointers to the activeThreads list for each stage 227 fetch.setActiveThreads(&activeThreads); 228 decode.setActiveThreads(&activeThreads); 229 rename.setActiveThreads(&activeThreads); 230 iew.setActiveThreads(&activeThreads); 231 commit.setActiveThreads(&activeThreads); 232 233 // Give each of the stages the time buffer they will use. 234 fetch.setTimeBuffer(&timeBuffer); 235 decode.setTimeBuffer(&timeBuffer); 236 rename.setTimeBuffer(&timeBuffer); 237 iew.setTimeBuffer(&timeBuffer); 238 commit.setTimeBuffer(&timeBuffer); 239 240 // Also setup each of the stages' queues. 241 fetch.setFetchQueue(&fetchQueue); 242 decode.setFetchQueue(&fetchQueue); 243 commit.setFetchQueue(&fetchQueue); 244 decode.setDecodeQueue(&decodeQueue); 245 rename.setDecodeQueue(&decodeQueue); 246 rename.setRenameQueue(&renameQueue); 247 iew.setRenameQueue(&renameQueue); 248 iew.setIEWQueue(&iewQueue); 249 commit.setIEWQueue(&iewQueue); 250 commit.setRenameQueue(&renameQueue); 251 252 commit.setIEWStage(&iew); 253 rename.setIEWStage(&iew); 254 rename.setCommitStage(&commit); 255 256#if !FULL_SYSTEM 257 int active_threads = params->workload.size(); 258 259 if (active_threads > Impl::MaxThreads) { 260 panic("Workload Size too large. Increase the 'MaxThreads'" 261 "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) or " 262 "edit your workload size."); 263 } 264#else 265 int active_threads = 1; 266#endif 267 268 //Make Sure That this a Valid Architeture 269 assert(params->numPhysIntRegs >= numThreads * TheISA::NumIntRegs); 270 assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs); 271 272 rename.setScoreboard(&scoreboard); 273 iew.setScoreboard(&scoreboard); 274 275 // Setup the rename map for whichever stages need it. 276 PhysRegIndex lreg_idx = 0; 277 PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs 278 279 for (int tid=0; tid < numThreads; tid++) { 280 bool bindRegs = (tid <= active_threads - 1); 281 282 commitRenameMap[tid].init(TheISA::NumIntRegs, 283 params->numPhysIntRegs, 284 lreg_idx, //Index for Logical. Regs 285 286 TheISA::NumFloatRegs, 287 params->numPhysFloatRegs, 288 freg_idx, //Index for Float Regs 289 290 TheISA::NumMiscRegs, 291 292 TheISA::ZeroReg, 293 TheISA::ZeroReg, 294 295 tid, 296 false); 297 298 renameMap[tid].init(TheISA::NumIntRegs, 299 params->numPhysIntRegs, 300 lreg_idx, //Index for Logical. Regs 301 302 TheISA::NumFloatRegs, 303 params->numPhysFloatRegs, 304 freg_idx, //Index for Float Regs 305 306 TheISA::NumMiscRegs, 307 308 TheISA::ZeroReg, 309 TheISA::ZeroReg, 310 311 tid, 312 bindRegs); 313 314 activateThreadEvent[tid].init(tid, this); 315 deallocateContextEvent[tid].init(tid, this); 316 } 317 318 rename.setRenameMap(renameMap); 319 commit.setRenameMap(commitRenameMap); 320 321 // Give renameMap & rename stage access to the freeList; 322 for (int i=0; i < numThreads; i++) { 323 renameMap[i].setFreeList(&freeList); 324 } 325 rename.setFreeList(&freeList); 326 327 // Setup the ROB for whichever stages need it. 328 commit.setROB(&rob); 329 330 lastRunningCycle = curTick; 331 332 lastActivatedCycle = -1; 333 334 // Give renameMap & rename stage access to the freeList; 335 //for (int i=0; i < numThreads; i++) { 336 //globalSeqNum[i] = 1; 337 //} 338 339 contextSwitch = false; 340} 341 342template <class Impl> 343FullO3CPU<Impl>::~FullO3CPU() 344{ 345} 346 347template <class Impl> 348void 349FullO3CPU<Impl>::fullCPURegStats() 350{ 351 BaseO3CPU::regStats(); 352 353 // Register any of the O3CPU's stats here. 354 timesIdled 355 .name(name() + ".timesIdled") 356 .desc("Number of times that the entire CPU went into an idle state and" 357 " unscheduled itself") 358 .prereq(timesIdled); 359 360 idleCycles 361 .name(name() + ".idleCycles") 362 .desc("Total number of cycles that the CPU has spent unscheduled due " 363 "to idling") 364 .prereq(idleCycles); 365 366 // Number of Instructions simulated 367 // -------------------------------- 368 // Should probably be in Base CPU but need templated 369 // MaxThreads so put in here instead 370 committedInsts 371 .init(numThreads) 372 .name(name() + ".committedInsts") 373 .desc("Number of Instructions Simulated"); 374 375 totalCommittedInsts 376 .name(name() + ".committedInsts_total") 377 .desc("Number of Instructions Simulated"); 378 379 cpi 380 .name(name() + ".cpi") 381 .desc("CPI: Cycles Per Instruction") 382 .precision(6); 383 cpi = numCycles / committedInsts; 384 385 totalCpi 386 .name(name() + ".cpi_total") 387 .desc("CPI: Total CPI of All Threads") 388 .precision(6); 389 totalCpi = numCycles / totalCommittedInsts; 390 391 ipc 392 .name(name() + ".ipc") 393 .desc("IPC: Instructions Per Cycle") 394 .precision(6); 395 ipc = committedInsts / numCycles; 396 397 totalIpc 398 .name(name() + ".ipc_total") 399 .desc("IPC: Total IPC of All Threads") 400 .precision(6); 401 totalIpc = totalCommittedInsts / numCycles; 402 403} 404 405template <class Impl> 406Port * 407FullO3CPU<Impl>::getPort(const std::string &if_name, int idx) 408{ 409 if (if_name == "dcache_port") 410 return iew.getDcachePort(); 411 else if (if_name == "icache_port") 412 return fetch.getIcachePort(); 413 else 414 panic("No Such Port\n"); 415} 416 417template <class Impl> 418void 419FullO3CPU<Impl>::tick() 420{ 421 DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n"); 422 423 ++numCycles; 424 425// activity = false; 426 427 //Tick each of the stages 428 fetch.tick(); 429 430 decode.tick(); 431 432 rename.tick(); 433 434 iew.tick(); 435 436 commit.tick(); 437 438#if !FULL_SYSTEM 439 doContextSwitch(); 440#endif 441 442 // Now advance the time buffers 443 timeBuffer.advance(); 444 445 fetchQueue.advance(); 446 decodeQueue.advance(); 447 renameQueue.advance(); 448 iewQueue.advance(); 449 450 activityRec.advance(); 451 452 if (removeInstsThisCycle) { 453 cleanUpRemovedInsts(); 454 } 455 456 if (!tickEvent.scheduled()) { 457 if (_status == SwitchedOut || 458 getState() == SimObject::Drained) { 459 DPRINTF(O3CPU, "Switched out!\n"); 460 // increment stat 461 lastRunningCycle = curTick; 462 } else if (!activityRec.active() || _status == Idle) { 463 DPRINTF(O3CPU, "Idle!\n"); 464 lastRunningCycle = curTick; 465 timesIdled++; 466 } else { 467 tickEvent.schedule(nextCycle(curTick + ticks(1))); 468 DPRINTF(O3CPU, "Scheduling next tick!\n"); 469 } 470 } 471 472#if !FULL_SYSTEM 473 updateThreadPriority(); 474#endif 475 476} 477 478template <class Impl> 479void 480FullO3CPU<Impl>::init() 481{ 482 if (!deferRegistration) { 483 registerThreadContexts(); 484 } 485 486 // Set inSyscall so that the CPU doesn't squash when initially 487 // setting up registers. 488 for (int i = 0; i < number_of_threads; ++i) 489 thread[i]->inSyscall = true; 490 491 for (int tid=0; tid < number_of_threads; tid++) { 492#if FULL_SYSTEM 493 ThreadContext *src_tc = threadContexts[tid]; 494#else 495 ThreadContext *src_tc = thread[tid]->getTC(); 496#endif 497 // Threads start in the Suspended State 498 if (src_tc->status() != ThreadContext::Suspended) { 499 continue; 500 } 501 502#if FULL_SYSTEM 503 TheISA::initCPU(src_tc, src_tc->readCpuId()); 504#endif 505 } 506 507 // Clear inSyscall. 508 for (int i = 0; i < number_of_threads; ++i) 509 thread[i]->inSyscall = false; 510 511 // Initialize stages. 512 fetch.initStage(); 513 iew.initStage(); 514 rename.initStage(); 515 commit.initStage(); 516 517 commit.setThreads(thread); 518} 519 520template <class Impl> 521void 522FullO3CPU<Impl>::activateThread(unsigned tid) 523{ 524 list<unsigned>::iterator isActive = find( 525 activeThreads.begin(), activeThreads.end(), tid); 526 527 DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid); 528 529 if (isActive == activeThreads.end()) { 530 DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n", 531 tid); 532 533 activeThreads.push_back(tid); 534 } 535} 536 537template <class Impl> 538void 539FullO3CPU<Impl>::deactivateThread(unsigned tid) 540{ 541 //Remove From Active List, if Active 542 list<unsigned>::iterator thread_it = 543 find(activeThreads.begin(), activeThreads.end(), tid); 544 545 DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid); 546 547 if (thread_it != activeThreads.end()) { 548 DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n", 549 tid); 550 activeThreads.erase(thread_it); 551 } 552} 553 554template <class Impl> 555void 556FullO3CPU<Impl>::activateContext(int tid, int delay) 557{ 558 // Needs to set each stage to running as well. 559 if (delay){ 560 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate " 561 "on cycle %d\n", tid, curTick + ticks(delay)); 562 scheduleActivateThreadEvent(tid, delay); 563 } else { 564 activateThread(tid); 565 } 566 567 if (lastActivatedCycle < curTick) { 568 scheduleTickEvent(delay); 569 570 // Be sure to signal that there's some activity so the CPU doesn't 571 // deschedule itself. 572 activityRec.activity(); 573 fetch.wakeFromQuiesce(); 574 575 lastActivatedCycle = curTick; 576 577 _status = Running; 578 } 579} 580 581template <class Impl> 582bool 583FullO3CPU<Impl>::deallocateContext(int tid, bool remove, int delay) 584{ 585 // Schedule removal of thread data from CPU 586 if (delay){ 587 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate " 588 "on cycle %d\n", tid, curTick + ticks(delay)); 589 scheduleDeallocateContextEvent(tid, remove, delay); 590 return false; 591 } else { 592 deactivateThread(tid); 593 if (remove) 594 removeThread(tid); 595 return true; 596 } 597} 598 599template <class Impl> 600void 601FullO3CPU<Impl>::suspendContext(int tid) 602{ 603 DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid); 604 bool deallocated = deallocateContext(tid, false, 1); 605 // If this was the last thread then unschedule the tick event. 606 if (activeThreads.size() == 1 && !deallocated || 607 activeThreads.size() == 0) 608 unscheduleTickEvent(); 609 _status = Idle; 610} 611 612template <class Impl> 613void 614FullO3CPU<Impl>::haltContext(int tid) 615{ 616 //For now, this is the same as deallocate 617 DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid); 618 deallocateContext(tid, true, 1); 619} 620 621template <class Impl> 622void 623FullO3CPU<Impl>::insertThread(unsigned tid) 624{ 625 DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU"); 626 // Will change now that the PC and thread state is internal to the CPU 627 // and not in the ThreadContext. 628#if FULL_SYSTEM 629 ThreadContext *src_tc = system->threadContexts[tid]; 630#else 631 ThreadContext *src_tc = tcBase(tid); 632#endif 633 634 //Bind Int Regs to Rename Map 635 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) { 636 PhysRegIndex phys_reg = freeList.getIntReg(); 637 638 renameMap[tid].setEntry(ireg,phys_reg); 639 scoreboard.setReg(phys_reg); 640 } 641 642 //Bind Float Regs to Rename Map 643 for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) { 644 PhysRegIndex phys_reg = freeList.getFloatReg(); 645 646 renameMap[tid].setEntry(freg,phys_reg); 647 scoreboard.setReg(phys_reg); 648 } 649 650 //Copy Thread Data Into RegFile 651 //this->copyFromTC(tid); 652 653 //Set PC/NPC/NNPC 654 setPC(src_tc->readPC(), tid); 655 setNextPC(src_tc->readNextPC(), tid); 656 setNextNPC(src_tc->readNextNPC(), tid); 657 658 src_tc->setStatus(ThreadContext::Active); 659 660 activateContext(tid,1); 661 662 //Reset ROB/IQ/LSQ Entries 663 commit.rob->resetEntries(); 664 iew.resetEntries(); 665} 666 667template <class Impl> 668void 669FullO3CPU<Impl>::removeThread(unsigned tid) 670{ 671 DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid); 672 673 // Copy Thread Data From RegFile 674 // If thread is suspended, it might be re-allocated 675 //this->copyToTC(tid); 676 677 // Unbind Int Regs from Rename Map 678 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) { 679 PhysRegIndex phys_reg = renameMap[tid].lookup(ireg); 680 681 scoreboard.unsetReg(phys_reg); 682 freeList.addReg(phys_reg); 683 } 684 685 // Unbind Float Regs from Rename Map 686 for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) { 687 PhysRegIndex phys_reg = renameMap[tid].lookup(freg); 688 689 scoreboard.unsetReg(phys_reg); 690 freeList.addReg(phys_reg); 691 } 692 693 // Squash Throughout Pipeline 694 InstSeqNum squash_seq_num = commit.rob->readHeadInst(tid)->seqNum; 695 fetch.squash(0, sizeof(TheISA::MachInst), 0, squash_seq_num, tid); 696 decode.squash(tid); 697 rename.squash(squash_seq_num, tid); 698 iew.squash(tid); 699 commit.rob->squash(squash_seq_num, tid); 700 701 assert(iew.ldstQueue.getCount(tid) == 0); 702 703 // Reset ROB/IQ/LSQ Entries 704 705 // Commented out for now. This should be possible to do by 706 // telling all the pipeline stages to drain first, and then 707 // checking until the drain completes. Once the pipeline is 708 // drained, call resetEntries(). - 10-09-06 ktlim 709/* 710 if (activeThreads.size() >= 1) { 711 commit.rob->resetEntries(); 712 iew.resetEntries(); 713 } 714*/ 715} 716 717 718template <class Impl> 719void 720FullO3CPU<Impl>::activateWhenReady(int tid) 721{ 722 DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming" 723 "(e.g. PhysRegs/ROB/IQ/LSQ) \n", 724 tid); 725 726 bool ready = true; 727 728 if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) { 729 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " 730 "Phys. Int. Regs.\n", 731 tid); 732 ready = false; 733 } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) { 734 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " 735 "Phys. Float. Regs.\n", 736 tid); 737 ready = false; 738 } else if (commit.rob->numFreeEntries() >= 739 commit.rob->entryAmount(activeThreads.size() + 1)) { 740 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " 741 "ROB entries.\n", 742 tid); 743 ready = false; 744 } else if (iew.instQueue.numFreeEntries() >= 745 iew.instQueue.entryAmount(activeThreads.size() + 1)) { 746 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " 747 "IQ entries.\n", 748 tid); 749 ready = false; 750 } else if (iew.ldstQueue.numFreeEntries() >= 751 iew.ldstQueue.entryAmount(activeThreads.size() + 1)) { 752 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " 753 "LSQ entries.\n", 754 tid); 755 ready = false; 756 } 757 758 if (ready) { 759 insertThread(tid); 760 761 contextSwitch = false; 762 763 cpuWaitList.remove(tid); 764 } else { 765 suspendContext(tid); 766 767 //blocks fetch 768 contextSwitch = true; 769 770 //@todo: dont always add to waitlist 771 //do waitlist 772 cpuWaitList.push_back(tid); 773 } 774} 775 776#if FULL_SYSTEM 777template <class Impl> 778void 779FullO3CPU<Impl>::updateMemPorts() 780{ 781 // Update all ThreadContext's memory ports (Functional/Virtual 782 // Ports) 783 for (int i = 0; i < thread.size(); ++i) 784 thread[i]->connectMemPorts(); 785} 786#endif 787 788template <class Impl> 789void 790FullO3CPU<Impl>::serialize(std::ostream &os) 791{ 792 SimObject::State so_state = SimObject::getState(); 793 SERIALIZE_ENUM(so_state); 794 BaseCPU::serialize(os); 795 nameOut(os, csprintf("%s.tickEvent", name())); 796 tickEvent.serialize(os); 797 798 // Use SimpleThread's ability to checkpoint to make it easier to 799 // write out the registers. Also make this static so it doesn't 800 // get instantiated multiple times (causes a panic in statistics). 801 static SimpleThread temp; 802 803 for (int i = 0; i < thread.size(); i++) { 804 nameOut(os, csprintf("%s.xc.%i", name(), i)); 805 temp.copyTC(thread[i]->getTC()); 806 temp.serialize(os); 807 } 808} 809 810template <class Impl> 811void 812FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string §ion) 813{ 814 SimObject::State so_state; 815 UNSERIALIZE_ENUM(so_state); 816 BaseCPU::unserialize(cp, section); 817 tickEvent.unserialize(cp, csprintf("%s.tickEvent", section)); 818 819 // Use SimpleThread's ability to checkpoint to make it easier to 820 // read in the registers. Also make this static so it doesn't 821 // get instantiated multiple times (causes a panic in statistics). 822 static SimpleThread temp; 823 824 for (int i = 0; i < thread.size(); i++) { 825 temp.copyTC(thread[i]->getTC()); 826 temp.unserialize(cp, csprintf("%s.xc.%i", section, i)); 827 thread[i]->getTC()->copyArchRegs(temp.getTC()); 828 } 829} 830 831template <class Impl> 832unsigned int 833FullO3CPU<Impl>::drain(Event *drain_event) 834{ 835 DPRINTF(O3CPU, "Switching out\n"); 836 837 // If the CPU isn't doing anything, then return immediately. 838 if (_status == Idle || _status == SwitchedOut) { 839 return 0; 840 } 841 842 drainCount = 0; 843 fetch.drain(); 844 decode.drain(); 845 rename.drain(); 846 iew.drain(); 847 commit.drain(); 848 849 // Wake the CPU and record activity so everything can drain out if 850 // the CPU was not able to immediately drain. 851 if (getState() != SimObject::Drained) { 852 // A bit of a hack...set the drainEvent after all the drain() 853 // calls have been made, that way if all of the stages drain 854 // immediately, the signalDrained() function knows not to call 855 // process on the drain event. 856 drainEvent = drain_event; 857 858 wakeCPU(); 859 activityRec.activity(); 860 861 return 1; 862 } else { 863 return 0; 864 } 865} 866 867template <class Impl> 868void 869FullO3CPU<Impl>::resume() 870{ 871 fetch.resume(); 872 decode.resume(); 873 rename.resume(); 874 iew.resume(); 875 commit.resume(); 876 877 changeState(SimObject::Running); 878 879 if (_status == SwitchedOut || _status == Idle) 880 return; 881 882#if FULL_SYSTEM 883 assert(system->getMemoryMode() == Enums::timing); 884#endif 885 886 if (!tickEvent.scheduled()) 887 tickEvent.schedule(nextCycle()); 888 _status = Running; 889} 890 891template <class Impl> 892void 893FullO3CPU<Impl>::signalDrained() 894{ 895 if (++drainCount == NumStages) { 896 if (tickEvent.scheduled()) 897 tickEvent.squash(); 898 899 changeState(SimObject::Drained); 900 901 BaseCPU::switchOut(); 902 903 if (drainEvent) { 904 drainEvent->process(); 905 drainEvent = NULL; 906 } 907 } 908 assert(drainCount <= 5); 909} 910 911template <class Impl> 912void 913FullO3CPU<Impl>::switchOut() 914{ 915 fetch.switchOut(); 916 rename.switchOut(); 917 iew.switchOut(); 918 commit.switchOut(); 919 instList.clear(); 920 while (!removeList.empty()) { 921 removeList.pop(); 922 } 923 924 _status = SwitchedOut; 925#if USE_CHECKER 926 if (checker) 927 checker->switchOut(); 928#endif 929 if (tickEvent.scheduled()) 930 tickEvent.squash(); 931} 932 933template <class Impl> 934void 935FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU) 936{ 937 // Flush out any old data from the time buffers. 938 for (int i = 0; i < timeBuffer.getSize(); ++i) { 939 timeBuffer.advance(); 940 fetchQueue.advance(); 941 decodeQueue.advance(); 942 renameQueue.advance(); 943 iewQueue.advance(); 944 } 945 946 activityRec.reset(); 947 948 BaseCPU::takeOverFrom(oldCPU, fetch.getIcachePort(), iew.getDcachePort()); 949 950 fetch.takeOverFrom(); 951 decode.takeOverFrom(); 952 rename.takeOverFrom(); 953 iew.takeOverFrom(); 954 commit.takeOverFrom(); 955 956 assert(!tickEvent.scheduled()); 957 958 // @todo: Figure out how to properly select the tid to put onto 959 // the active threads list. 960 int tid = 0; 961 962 list<unsigned>::iterator isActive = find( 963 activeThreads.begin(), activeThreads.end(), tid); 964 965 if (isActive == activeThreads.end()) { 966 //May Need to Re-code this if the delay variable is the delay 967 //needed for thread to activate 968 DPRINTF(O3CPU, "Adding Thread %i to active threads list\n", 969 tid); 970 971 activeThreads.push_back(tid); 972 } 973 974 // Set all statuses to active, schedule the CPU's tick event. 975 // @todo: Fix up statuses so this is handled properly 976 for (int i = 0; i < threadContexts.size(); ++i) { 977 ThreadContext *tc = threadContexts[i]; 978 if (tc->status() == ThreadContext::Active && _status != Running) { 979 _status = Running; 980 tickEvent.schedule(nextCycle()); 981 } 982 } 983 if (!tickEvent.scheduled()) 984 tickEvent.schedule(nextCycle()); 985} 986 987template <class Impl> 988uint64_t 989FullO3CPU<Impl>::readIntReg(int reg_idx) 990{ 991 return regFile.readIntReg(reg_idx); 992} 993 994template <class Impl> 995FloatReg 996FullO3CPU<Impl>::readFloatReg(int reg_idx, int width) 997{ 998 return regFile.readFloatReg(reg_idx, width); 999} 1000 1001template <class Impl> 1002FloatReg 1003FullO3CPU<Impl>::readFloatReg(int reg_idx) 1004{ 1005 return regFile.readFloatReg(reg_idx); 1006} 1007 1008template <class Impl> 1009FloatRegBits 1010FullO3CPU<Impl>::readFloatRegBits(int reg_idx, int width) 1011{ 1012 return regFile.readFloatRegBits(reg_idx, width); 1013} 1014 1015template <class Impl> 1016FloatRegBits 1017FullO3CPU<Impl>::readFloatRegBits(int reg_idx) 1018{ 1019 return regFile.readFloatRegBits(reg_idx); 1020} 1021 1022template <class Impl> 1023void 1024FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val) 1025{ 1026 regFile.setIntReg(reg_idx, val); 1027} 1028 1029template <class Impl> 1030void 1031FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val, int width) 1032{ 1033 regFile.setFloatReg(reg_idx, val, width); 1034} 1035 1036template <class Impl> 1037void 1038FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val) 1039{ 1040 regFile.setFloatReg(reg_idx, val); 1041} 1042 1043template <class Impl> 1044void 1045FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, int width) 1046{ 1047 regFile.setFloatRegBits(reg_idx, val, width); 1048} 1049 1050template <class Impl> 1051void 1052FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val) 1053{ 1054 regFile.setFloatRegBits(reg_idx, val); 1055} 1056 1057template <class Impl> 1058uint64_t 1059FullO3CPU<Impl>::readArchIntReg(int reg_idx, unsigned tid) 1060{ 1061 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx); 1062 1063 return regFile.readIntReg(phys_reg); 1064} 1065 1066template <class Impl> 1067float 1068FullO3CPU<Impl>::readArchFloatRegSingle(int reg_idx, unsigned tid) 1069{ 1070 int idx = reg_idx + TheISA::FP_Base_DepTag; 1071 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); 1072 1073 return regFile.readFloatReg(phys_reg); 1074} 1075 1076template <class Impl> 1077double 1078FullO3CPU<Impl>::readArchFloatRegDouble(int reg_idx, unsigned tid) 1079{ 1080 int idx = reg_idx + TheISA::FP_Base_DepTag; 1081 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); 1082 1083 return regFile.readFloatReg(phys_reg, 64); 1084} 1085 1086template <class Impl> 1087uint64_t 1088FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, unsigned tid) 1089{ 1090 int idx = reg_idx + TheISA::FP_Base_DepTag; 1091 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); 1092 1093 return regFile.readFloatRegBits(phys_reg); 1094} 1095 1096template <class Impl> 1097void 1098FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, unsigned tid) 1099{ 1100 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx); 1101 1102 regFile.setIntReg(phys_reg, val); 1103} 1104 1105template <class Impl> 1106void 1107FullO3CPU<Impl>::setArchFloatRegSingle(int reg_idx, float val, unsigned tid) 1108{ 1109 int idx = reg_idx + TheISA::FP_Base_DepTag; 1110 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); 1111 1112 regFile.setFloatReg(phys_reg, val); 1113} 1114 1115template <class Impl> 1116void 1117FullO3CPU<Impl>::setArchFloatRegDouble(int reg_idx, double val, unsigned tid) 1118{ 1119 int idx = reg_idx + TheISA::FP_Base_DepTag; 1120 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); 1121 1122 regFile.setFloatReg(phys_reg, val, 64); 1123} 1124 1125template <class Impl> 1126void 1127FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, unsigned tid) 1128{ 1129 int idx = reg_idx + TheISA::FP_Base_DepTag; 1130 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); 1131 1132 regFile.setFloatRegBits(phys_reg, val); 1133} 1134 1135template <class Impl> 1136uint64_t 1137FullO3CPU<Impl>::readPC(unsigned tid) 1138{ 1139 return commit.readPC(tid); 1140} 1141 1142template <class Impl> 1143void 1144FullO3CPU<Impl>::setPC(Addr new_PC,unsigned tid) 1145{ 1146 commit.setPC(new_PC, tid); 1147} 1148 1149template <class Impl> 1150uint64_t 1151FullO3CPU<Impl>::readMicroPC(unsigned tid) 1152{ 1153 return commit.readMicroPC(tid); 1154} 1155 1156template <class Impl> 1157void 1158FullO3CPU<Impl>::setMicroPC(Addr new_PC,unsigned tid) 1159{ 1160 commit.setMicroPC(new_PC, tid); 1161} 1162 1163template <class Impl> 1164uint64_t 1165FullO3CPU<Impl>::readNextPC(unsigned tid) 1166{ 1167 return commit.readNextPC(tid); 1168} 1169 1170template <class Impl> 1171void 1172FullO3CPU<Impl>::setNextPC(uint64_t val,unsigned tid) 1173{ 1174 commit.setNextPC(val, tid); 1175} 1176 1177template <class Impl> 1178uint64_t 1179FullO3CPU<Impl>::readNextNPC(unsigned tid) 1180{ 1181 return commit.readNextNPC(tid); 1182} 1183 1184template <class Impl> 1185void 1186FullO3CPU<Impl>::setNextNPC(uint64_t val,unsigned tid) 1187{ 1188 commit.setNextNPC(val, tid); 1189} 1190 1191template <class Impl> 1192uint64_t 1193FullO3CPU<Impl>::readNextMicroPC(unsigned tid) 1194{ 1195 return commit.readNextMicroPC(tid); 1196} 1197 1198template <class Impl> 1199void 1200FullO3CPU<Impl>::setNextMicroPC(Addr new_PC,unsigned tid) 1201{ 1202 commit.setNextMicroPC(new_PC, tid); 1203} 1204 1205template <class Impl> 1206typename FullO3CPU<Impl>::ListIt 1207FullO3CPU<Impl>::addInst(DynInstPtr &inst) 1208{ 1209 instList.push_back(inst); 1210 1211 return --(instList.end()); 1212} 1213 1214template <class Impl> 1215void 1216FullO3CPU<Impl>::instDone(unsigned tid) 1217{ 1218 // Keep an instruction count. 1219 thread[tid]->numInst++; 1220 thread[tid]->numInsts++; 1221 committedInsts[tid]++; 1222 totalCommittedInsts++; 1223 1224 // Check for instruction-count-based events. 1225 comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst); 1226} 1227 1228template <class Impl> 1229void 1230FullO3CPU<Impl>::addToRemoveList(DynInstPtr &inst) 1231{ 1232 removeInstsThisCycle = true; 1233 1234 removeList.push(inst->getInstListIt()); 1235} 1236 1237template <class Impl> 1238void 1239FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst) 1240{ 1241 DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %#x " 1242 "[sn:%lli]\n", 1243 inst->threadNumber, inst->readPC(), inst->seqNum); 1244 1245 removeInstsThisCycle = true; 1246 1247 // Remove the front instruction. 1248 removeList.push(inst->getInstListIt()); 1249} 1250 1251template <class Impl> 1252void 1253FullO3CPU<Impl>::removeInstsNotInROB(unsigned tid) 1254{ 1255 DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction" 1256 " list.\n", tid); 1257 1258 ListIt end_it; 1259 1260 bool rob_empty = false; 1261 1262 if (instList.empty()) { 1263 return; 1264 } else if (rob.isEmpty(/*tid*/)) { 1265 DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n"); 1266 end_it = instList.begin(); 1267 rob_empty = true; 1268 } else { 1269 end_it = (rob.readTailInst(tid))->getInstListIt(); 1270 DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n"); 1271 } 1272 1273 removeInstsThisCycle = true; 1274 1275 ListIt inst_it = instList.end(); 1276 1277 inst_it--; 1278 1279 // Walk through the instruction list, removing any instructions 1280 // that were inserted after the given instruction iterator, end_it. 1281 while (inst_it != end_it) { 1282 assert(!instList.empty()); 1283 1284 squashInstIt(inst_it, tid); 1285 1286 inst_it--; 1287 } 1288 1289 // If the ROB was empty, then we actually need to remove the first 1290 // instruction as well. 1291 if (rob_empty) { 1292 squashInstIt(inst_it, tid); 1293 } 1294} 1295 1296template <class Impl> 1297void 1298FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, 1299 unsigned tid) 1300{ 1301 assert(!instList.empty()); 1302 1303 removeInstsThisCycle = true; 1304 1305 ListIt inst_iter = instList.end(); 1306 1307 inst_iter--; 1308 1309 DPRINTF(O3CPU, "Deleting instructions from instruction " 1310 "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n", 1311 tid, seq_num, (*inst_iter)->seqNum); 1312 1313 while ((*inst_iter)->seqNum > seq_num) { 1314 1315 bool break_loop = (inst_iter == instList.begin()); 1316 1317 squashInstIt(inst_iter, tid); 1318 1319 inst_iter--; 1320 1321 if (break_loop) 1322 break; 1323 } 1324} 1325 1326template <class Impl> 1327inline void 1328FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, const unsigned &tid) 1329{ 1330 if ((*instIt)->threadNumber == tid) { 1331 DPRINTF(O3CPU, "Squashing instruction, " 1332 "[tid:%i] [sn:%lli] PC %#x\n", 1333 (*instIt)->threadNumber, 1334 (*instIt)->seqNum, 1335 (*instIt)->readPC()); 1336 1337 // Mark it as squashed. 1338 (*instIt)->setSquashed(); 1339 1340 // @todo: Formulate a consistent method for deleting 1341 // instructions from the instruction list 1342 // Remove the instruction from the list. 1343 removeList.push(instIt); 1344 } 1345} 1346 1347template <class Impl> 1348void 1349FullO3CPU<Impl>::cleanUpRemovedInsts() 1350{ 1351 while (!removeList.empty()) { 1352 DPRINTF(O3CPU, "Removing instruction, " 1353 "[tid:%i] [sn:%lli] PC %#x\n", 1354 (*removeList.front())->threadNumber, 1355 (*removeList.front())->seqNum, 1356 (*removeList.front())->readPC()); 1357 1358 instList.erase(removeList.front()); 1359 1360 removeList.pop(); 1361 } 1362 1363 removeInstsThisCycle = false; 1364} 1365/* 1366template <class Impl> 1367void 1368FullO3CPU<Impl>::removeAllInsts() 1369{ 1370 instList.clear(); 1371} 1372*/ 1373template <class Impl> 1374void 1375FullO3CPU<Impl>::dumpInsts() 1376{ 1377 int num = 0; 1378 1379 ListIt inst_list_it = instList.begin(); 1380 1381 cprintf("Dumping Instruction List\n"); 1382 1383 while (inst_list_it != instList.end()) { 1384 cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n" 1385 "Squashed:%i\n\n", 1386 num, (*inst_list_it)->readPC(), (*inst_list_it)->threadNumber, 1387 (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(), 1388 (*inst_list_it)->isSquashed()); 1389 inst_list_it++; 1390 ++num; 1391 } 1392} 1393/* 1394template <class Impl> 1395void 1396FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst) 1397{ 1398 iew.wakeDependents(inst); 1399} 1400*/ 1401template <class Impl> 1402void 1403FullO3CPU<Impl>::wakeCPU() 1404{ 1405 if (activityRec.active() || tickEvent.scheduled()) { 1406 DPRINTF(Activity, "CPU already running.\n"); 1407 return; 1408 } 1409 1410 DPRINTF(Activity, "Waking up CPU\n"); 1411 1412 idleCycles += tickToCycles((curTick - 1) - lastRunningCycle); 1413 numCycles += tickToCycles((curTick - 1) - lastRunningCycle); 1414 1415 tickEvent.schedule(nextCycle()); 1416} 1417 1418template <class Impl> 1419int 1420FullO3CPU<Impl>::getFreeTid() 1421{ 1422 for (int i=0; i < numThreads; i++) { 1423 if (!tids[i]) { 1424 tids[i] = true; 1425 return i; 1426 } 1427 } 1428 1429 return -1; 1430} 1431 1432template <class Impl> 1433void 1434FullO3CPU<Impl>::doContextSwitch() 1435{ 1436 if (contextSwitch) { 1437 1438 //ADD CODE TO DEACTIVE THREAD HERE (???) 1439 1440 for (int tid=0; tid < cpuWaitList.size(); tid++) { 1441 activateWhenReady(tid); 1442 } 1443 1444 if (cpuWaitList.size() == 0) 1445 contextSwitch = true; 1446 } 1447} 1448 1449template <class Impl> 1450void 1451FullO3CPU<Impl>::updateThreadPriority() 1452{ 1453 if (activeThreads.size() > 1) 1454 { 1455 //DEFAULT TO ROUND ROBIN SCHEME 1456 //e.g. Move highest priority to end of thread list 1457 list<unsigned>::iterator list_begin = activeThreads.begin(); 1458 list<unsigned>::iterator list_end = activeThreads.end(); 1459 1460 unsigned high_thread = *list_begin; 1461 1462 activeThreads.erase(list_begin); 1463 1464 activeThreads.push_back(high_thread); 1465 } 1466} 1467 1468// Forward declaration of FullO3CPU. 1469template class FullO3CPU<O3CPUImpl>; 1470