cpu.cc revision 13908:6ab98c626b06 
1/*
2 * Copyright (c) 2011-2012, 2014, 2016, 2017, 2019 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 "cpu/o3/cpu.hh"
48
49#include "arch/generic/traits.hh"
50#include "arch/kernel_stats.hh"
51#include "config/the_isa.hh"
52#include "cpu/activity.hh"
53#include "cpu/checker/cpu.hh"
54#include "cpu/checker/thread_context.hh"
55#include "cpu/o3/isa_specific.hh"
56#include "cpu/o3/thread_context.hh"
57#include "cpu/quiesce_event.hh"
58#include "cpu/simple_thread.hh"
59#include "cpu/thread_context.hh"
60#include "debug/Activity.hh"
61#include "debug/Drain.hh"
62#include "debug/O3CPU.hh"
63#include "debug/Quiesce.hh"
64#include "enums/MemoryMode.hh"
65#include "sim/core.hh"
66#include "sim/full_system.hh"
67#include "sim/process.hh"
68#include "sim/stat_control.hh"
69#include "sim/system.hh"
70
71#if THE_ISA == ALPHA_ISA
72#include "arch/alpha/osfpal.hh"
73#include "debug/Activity.hh"
74
75#endif
76
77struct BaseCPUParams;
78
79using namespace TheISA;
80using namespace std;
81
82BaseO3CPU::BaseO3CPU(BaseCPUParams *params)
83    : BaseCPU(params)
84{
85}
86
87void
88BaseO3CPU::regStats()
89{
90    BaseCPU::regStats();
91}
92
93template<class Impl>
94bool
95FullO3CPU<Impl>::IcachePort::recvTimingResp(PacketPtr pkt)
96{
97    DPRINTF(O3CPU, "Fetch unit received timing\n");
98    // We shouldn't ever get a cacheable block in Modified state
99    assert(pkt->req->isUncacheable() ||
100           !(pkt->cacheResponding() && !pkt->hasSharers()));
101    fetch->processCacheCompletion(pkt);
102
103    return true;
104}
105
106template<class Impl>
107void
108FullO3CPU<Impl>::IcachePort::recvReqRetry()
109{
110    fetch->recvReqRetry();
111}
112
113template <class Impl>
114bool
115FullO3CPU<Impl>::DcachePort::recvTimingResp(PacketPtr pkt)
116{
117    return lsq->recvTimingResp(pkt);
118}
119
120template <class Impl>
121void
122FullO3CPU<Impl>::DcachePort::recvTimingSnoopReq(PacketPtr pkt)
123{
124    for (ThreadID tid = 0; tid < cpu->numThreads; tid++) {
125        if (cpu->getCpuAddrMonitor(tid)->doMonitor(pkt)) {
126            cpu->wakeup(tid);
127        }
128    }
129    lsq->recvTimingSnoopReq(pkt);
130}
131
132template <class Impl>
133void
134FullO3CPU<Impl>::DcachePort::recvReqRetry()
135{
136    lsq->recvReqRetry();
137}
138
139template <class Impl>
140FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
141    : BaseO3CPU(params),
142      itb(params->itb),
143      dtb(params->dtb),
144      tickEvent([this]{ tick(); }, "FullO3CPU tick",
145                false, Event::CPU_Tick_Pri),
146      threadExitEvent([this]{ exitThreads(); }, "FullO3CPU exit threads",
147                false, Event::CPU_Exit_Pri),
148#ifndef NDEBUG
149      instcount(0),
150#endif
151      removeInstsThisCycle(false),
152      fetch(this, params),
153      decode(this, params),
154      rename(this, params),
155      iew(this, params),
156      commit(this, params),
157
158      /* It is mandatory that all SMT threads use the same renaming mode as
159       * they are sharing registers and rename */
160      vecMode(RenameMode<TheISA::ISA>::init(params->isa[0])),
161      regFile(params->numPhysIntRegs,
162              params->numPhysFloatRegs,
163              params->numPhysVecRegs,
164              params->numPhysVecPredRegs,
165              params->numPhysCCRegs,
166              vecMode),
167
168      freeList(name() + ".freelist", &regFile),
169
170      rob(this, params),
171
172      scoreboard(name() + ".scoreboard",
173                 regFile.totalNumPhysRegs()),
174
175      isa(numThreads, NULL),
176
177      icachePort(&fetch, this),
178      dcachePort(&iew.ldstQueue, this),
179
180      timeBuffer(params->backComSize, params->forwardComSize),
181      fetchQueue(params->backComSize, params->forwardComSize),
182      decodeQueue(params->backComSize, params->forwardComSize),
183      renameQueue(params->backComSize, params->forwardComSize),
184      iewQueue(params->backComSize, params->forwardComSize),
185      activityRec(name(), NumStages,
186                  params->backComSize + params->forwardComSize,
187                  params->activity),
188
189      globalSeqNum(1),
190      system(params->system),
191      lastRunningCycle(curCycle())
192{
193    if (!params->switched_out) {
194        _status = Running;
195    } else {
196        _status = SwitchedOut;
197    }
198
199    if (params->checker) {
200        BaseCPU *temp_checker = params->checker;
201        checker = dynamic_cast<Checker<Impl> *>(temp_checker);
202        checker->setIcachePort(&icachePort);
203        checker->setSystem(params->system);
204    } else {
205        checker = NULL;
206    }
207
208    if (!FullSystem) {
209        thread.resize(numThreads);
210        tids.resize(numThreads);
211    }
212
213    // The stages also need their CPU pointer setup.  However this
214    // must be done at the upper level CPU because they have pointers
215    // to the upper level CPU, and not this FullO3CPU.
216
217    // Set up Pointers to the activeThreads list for each stage
218    fetch.setActiveThreads(&activeThreads);
219    decode.setActiveThreads(&activeThreads);
220    rename.setActiveThreads(&activeThreads);
221    iew.setActiveThreads(&activeThreads);
222    commit.setActiveThreads(&activeThreads);
223
224    // Give each of the stages the time buffer they will use.
225    fetch.setTimeBuffer(&timeBuffer);
226    decode.setTimeBuffer(&timeBuffer);
227    rename.setTimeBuffer(&timeBuffer);
228    iew.setTimeBuffer(&timeBuffer);
229    commit.setTimeBuffer(&timeBuffer);
230
231    // Also setup each of the stages' queues.
232    fetch.setFetchQueue(&fetchQueue);
233    decode.setFetchQueue(&fetchQueue);
234    commit.setFetchQueue(&fetchQueue);
235    decode.setDecodeQueue(&decodeQueue);
236    rename.setDecodeQueue(&decodeQueue);
237    rename.setRenameQueue(&renameQueue);
238    iew.setRenameQueue(&renameQueue);
239    iew.setIEWQueue(&iewQueue);
240    commit.setIEWQueue(&iewQueue);
241    commit.setRenameQueue(&renameQueue);
242
243    commit.setIEWStage(&iew);
244    rename.setIEWStage(&iew);
245    rename.setCommitStage(&commit);
246
247    ThreadID active_threads;
248    if (FullSystem) {
249        active_threads = 1;
250    } else {
251        active_threads = params->workload.size();
252
253        if (active_threads > Impl::MaxThreads) {
254            panic("Workload Size too large. Increase the 'MaxThreads' "
255                  "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) "
256                  "or edit your workload size.");
257        }
258    }
259
260    //Make Sure That this a Valid Architeture
261    assert(params->numPhysIntRegs   >= numThreads * TheISA::NumIntRegs);
262    assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
263    assert(params->numPhysVecRegs >= numThreads * TheISA::NumVecRegs);
264    assert(params->numPhysVecPredRegs >= numThreads * TheISA::NumVecPredRegs);
265    assert(params->numPhysCCRegs >= numThreads * TheISA::NumCCRegs);
266
267    rename.setScoreboard(&scoreboard);
268    iew.setScoreboard(&scoreboard);
269
270    // Setup the rename map for whichever stages need it.
271    for (ThreadID tid = 0; tid < numThreads; tid++) {
272        isa[tid] = params->isa[tid];
273        assert(RenameMode<TheISA::ISA>::equalsInit(isa[tid], isa[0]));
274
275        // Only Alpha has an FP zero register, so for other ISAs we
276        // use an invalid FP register index to avoid special treatment
277        // of any valid FP reg.
278        RegIndex invalidFPReg = TheISA::NumFloatRegs + 1;
279        RegIndex fpZeroReg =
280            (THE_ISA == ALPHA_ISA) ? TheISA::ZeroReg : invalidFPReg;
281
282        commitRenameMap[tid].init(&regFile, TheISA::ZeroReg, fpZeroReg,
283                                  &freeList,
284                                  vecMode);
285
286        renameMap[tid].init(&regFile, TheISA::ZeroReg, fpZeroReg,
287                            &freeList, vecMode);
288    }
289
290    // Initialize rename map to assign physical registers to the
291    // architectural registers for active threads only.
292    for (ThreadID tid = 0; tid < active_threads; tid++) {
293        for (RegIndex ridx = 0; ridx < TheISA::NumIntRegs; ++ridx) {
294            // Note that we can't use the rename() method because we don't
295            // want special treatment for the zero register at this point
296            PhysRegIdPtr phys_reg = freeList.getIntReg();
297            renameMap[tid].setEntry(RegId(IntRegClass, ridx), phys_reg);
298            commitRenameMap[tid].setEntry(RegId(IntRegClass, ridx), phys_reg);
299        }
300
301        for (RegIndex ridx = 0; ridx < TheISA::NumFloatRegs; ++ridx) {
302            PhysRegIdPtr phys_reg = freeList.getFloatReg();
303            renameMap[tid].setEntry(RegId(FloatRegClass, ridx), phys_reg);
304            commitRenameMap[tid].setEntry(
305                    RegId(FloatRegClass, ridx), phys_reg);
306        }
307
308        /* Here we need two 'interfaces' the 'whole register' and the
309         * 'register element'. At any point only one of them will be
310         * active. */
311        if (vecMode == Enums::Full) {
312            /* Initialize the full-vector interface */
313            for (RegIndex ridx = 0; ridx < TheISA::NumVecRegs; ++ridx) {
314                RegId rid = RegId(VecRegClass, ridx);
315                PhysRegIdPtr phys_reg = freeList.getVecReg();
316                renameMap[tid].setEntry(rid, phys_reg);
317                commitRenameMap[tid].setEntry(rid, phys_reg);
318            }
319        } else {
320            /* Initialize the vector-element interface */
321            for (RegIndex ridx = 0; ridx < TheISA::NumVecRegs; ++ridx) {
322                for (ElemIndex ldx = 0; ldx < TheISA::NumVecElemPerVecReg;
323                        ++ldx) {
324                    RegId lrid = RegId(VecElemClass, ridx, ldx);
325                    PhysRegIdPtr phys_elem = freeList.getVecElem();
326                    renameMap[tid].setEntry(lrid, phys_elem);
327                    commitRenameMap[tid].setEntry(lrid, phys_elem);
328                }
329            }
330        }
331
332        for (RegIndex ridx = 0; ridx < TheISA::NumVecPredRegs; ++ridx) {
333            PhysRegIdPtr phys_reg = freeList.getVecPredReg();
334            renameMap[tid].setEntry(RegId(VecPredRegClass, ridx), phys_reg);
335            commitRenameMap[tid].setEntry(
336                    RegId(VecPredRegClass, ridx), phys_reg);
337        }
338
339        for (RegIndex ridx = 0; ridx < TheISA::NumCCRegs; ++ridx) {
340            PhysRegIdPtr phys_reg = freeList.getCCReg();
341            renameMap[tid].setEntry(RegId(CCRegClass, ridx), phys_reg);
342            commitRenameMap[tid].setEntry(RegId(CCRegClass, ridx), phys_reg);
343        }
344    }
345
346    rename.setRenameMap(renameMap);
347    commit.setRenameMap(commitRenameMap);
348    rename.setFreeList(&freeList);
349
350    // Setup the ROB for whichever stages need it.
351    commit.setROB(&rob);
352
353    lastActivatedCycle = 0;
354#if 0
355    // Give renameMap & rename stage access to the freeList;
356    for (ThreadID tid = 0; tid < numThreads; tid++)
357        globalSeqNum[tid] = 1;
358#endif
359
360    DPRINTF(O3CPU, "Creating O3CPU object.\n");
361
362    // Setup any thread state.
363    this->thread.resize(this->numThreads);
364
365    for (ThreadID tid = 0; tid < this->numThreads; ++tid) {
366        if (FullSystem) {
367            // SMT is not supported in FS mode yet.
368            assert(this->numThreads == 1);
369            this->thread[tid] = new Thread(this, 0, NULL);
370        } else {
371            if (tid < params->workload.size()) {
372                DPRINTF(O3CPU, "Workload[%i] process is %#x",
373                        tid, this->thread[tid]);
374                this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
375                        (typename Impl::O3CPU *)(this),
376                        tid, params->workload[tid]);
377
378                //usedTids[tid] = true;
379                //threadMap[tid] = tid;
380            } else {
381                //Allocate Empty thread so M5 can use later
382                //when scheduling threads to CPU
383                Process* dummy_proc = NULL;
384
385                this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
386                        (typename Impl::O3CPU *)(this),
387                        tid, dummy_proc);
388                //usedTids[tid] = false;
389            }
390        }
391
392        ThreadContext *tc;
393
394        // Setup the TC that will serve as the interface to the threads/CPU.
395        O3ThreadContext<Impl> *o3_tc = new O3ThreadContext<Impl>;
396
397        tc = o3_tc;
398
399        // If we're using a checker, then the TC should be the
400        // CheckerThreadContext.
401        if (params->checker) {
402            tc = new CheckerThreadContext<O3ThreadContext<Impl> >(
403                o3_tc, this->checker);
404        }
405
406        o3_tc->cpu = (typename Impl::O3CPU *)(this);
407        assert(o3_tc->cpu);
408        o3_tc->thread = this->thread[tid];
409
410        // Setup quiesce event.
411        this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
412
413        // Give the thread the TC.
414        this->thread[tid]->tc = tc;
415
416        // Add the TC to the CPU's list of TC's.
417        this->threadContexts.push_back(tc);
418    }
419
420    // FullO3CPU always requires an interrupt controller.
421    if (!params->switched_out && interrupts.empty()) {
422        fatal("FullO3CPU %s has no interrupt controller.\n"
423              "Ensure createInterruptController() is called.\n", name());
424    }
425
426    for (ThreadID tid = 0; tid < this->numThreads; tid++)
427        this->thread[tid]->setFuncExeInst(0);
428}
429
430template <class Impl>
431FullO3CPU<Impl>::~FullO3CPU()
432{
433}
434
435template <class Impl>
436void
437FullO3CPU<Impl>::regProbePoints()
438{
439    BaseCPU::regProbePoints();
440
441    ppInstAccessComplete = new ProbePointArg<PacketPtr>(getProbeManager(), "InstAccessComplete");
442    ppDataAccessComplete = new ProbePointArg<std::pair<DynInstPtr, PacketPtr> >(getProbeManager(), "DataAccessComplete");
443
444    fetch.regProbePoints();
445    rename.regProbePoints();
446    iew.regProbePoints();
447    commit.regProbePoints();
448}
449
450template <class Impl>
451void
452FullO3CPU<Impl>::regStats()
453{
454    BaseO3CPU::regStats();
455
456    // Register any of the O3CPU's stats here.
457    timesIdled
458        .name(name() + ".timesIdled")
459        .desc("Number of times that the entire CPU went into an idle state and"
460              " unscheduled itself")
461        .prereq(timesIdled);
462
463    idleCycles
464        .name(name() + ".idleCycles")
465        .desc("Total number of cycles that the CPU has spent unscheduled due "
466              "to idling")
467        .prereq(idleCycles);
468
469    quiesceCycles
470        .name(name() + ".quiesceCycles")
471        .desc("Total number of cycles that CPU has spent quiesced or waiting "
472              "for an interrupt")
473        .prereq(quiesceCycles);
474
475    // Number of Instructions simulated
476    // --------------------------------
477    // Should probably be in Base CPU but need templated
478    // MaxThreads so put in here instead
479    committedInsts
480        .init(numThreads)
481        .name(name() + ".committedInsts")
482        .desc("Number of Instructions Simulated")
483        .flags(Stats::total);
484
485    committedOps
486        .init(numThreads)
487        .name(name() + ".committedOps")
488        .desc("Number of Ops (including micro ops) Simulated")
489        .flags(Stats::total);
490
491    cpi
492        .name(name() + ".cpi")
493        .desc("CPI: Cycles Per Instruction")
494        .precision(6);
495    cpi = numCycles / committedInsts;
496
497    totalCpi
498        .name(name() + ".cpi_total")
499        .desc("CPI: Total CPI of All Threads")
500        .precision(6);
501    totalCpi = numCycles / sum(committedInsts);
502
503    ipc
504        .name(name() + ".ipc")
505        .desc("IPC: Instructions Per Cycle")
506        .precision(6);
507    ipc =  committedInsts / numCycles;
508
509    totalIpc
510        .name(name() + ".ipc_total")
511        .desc("IPC: Total IPC of All Threads")
512        .precision(6);
513    totalIpc =  sum(committedInsts) / numCycles;
514
515    this->fetch.regStats();
516    this->decode.regStats();
517    this->rename.regStats();
518    this->iew.regStats();
519    this->commit.regStats();
520    this->rob.regStats();
521
522    intRegfileReads
523        .name(name() + ".int_regfile_reads")
524        .desc("number of integer regfile reads")
525        .prereq(intRegfileReads);
526
527    intRegfileWrites
528        .name(name() + ".int_regfile_writes")
529        .desc("number of integer regfile writes")
530        .prereq(intRegfileWrites);
531
532    fpRegfileReads
533        .name(name() + ".fp_regfile_reads")
534        .desc("number of floating regfile reads")
535        .prereq(fpRegfileReads);
536
537    fpRegfileWrites
538        .name(name() + ".fp_regfile_writes")
539        .desc("number of floating regfile writes")
540        .prereq(fpRegfileWrites);
541
542    vecRegfileReads
543        .name(name() + ".vec_regfile_reads")
544        .desc("number of vector regfile reads")
545        .prereq(vecRegfileReads);
546
547    vecRegfileWrites
548        .name(name() + ".vec_regfile_writes")
549        .desc("number of vector regfile writes")
550        .prereq(vecRegfileWrites);
551
552    vecPredRegfileReads
553        .name(name() + ".pred_regfile_reads")
554        .desc("number of predicate regfile reads")
555        .prereq(vecPredRegfileReads);
556
557    vecPredRegfileWrites
558        .name(name() + ".pred_regfile_writes")
559        .desc("number of predicate regfile writes")
560        .prereq(vecPredRegfileWrites);
561
562    ccRegfileReads
563        .name(name() + ".cc_regfile_reads")
564        .desc("number of cc regfile reads")
565        .prereq(ccRegfileReads);
566
567    ccRegfileWrites
568        .name(name() + ".cc_regfile_writes")
569        .desc("number of cc regfile writes")
570        .prereq(ccRegfileWrites);
571
572    miscRegfileReads
573        .name(name() + ".misc_regfile_reads")
574        .desc("number of misc regfile reads")
575        .prereq(miscRegfileReads);
576
577    miscRegfileWrites
578        .name(name() + ".misc_regfile_writes")
579        .desc("number of misc regfile writes")
580        .prereq(miscRegfileWrites);
581}
582
583template <class Impl>
584void
585FullO3CPU<Impl>::tick()
586{
587    DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
588    assert(!switchedOut());
589    assert(drainState() != DrainState::Drained);
590
591    ++numCycles;
592    updateCycleCounters(BaseCPU::CPU_STATE_ON);
593
594//    activity = false;
595
596    //Tick each of the stages
597    fetch.tick();
598
599    decode.tick();
600
601    rename.tick();
602
603    iew.tick();
604
605    commit.tick();
606
607    // Now advance the time buffers
608    timeBuffer.advance();
609
610    fetchQueue.advance();
611    decodeQueue.advance();
612    renameQueue.advance();
613    iewQueue.advance();
614
615    activityRec.advance();
616
617    if (removeInstsThisCycle) {
618        cleanUpRemovedInsts();
619    }
620
621    if (!tickEvent.scheduled()) {
622        if (_status == SwitchedOut) {
623            DPRINTF(O3CPU, "Switched out!\n");
624            // increment stat
625            lastRunningCycle = curCycle();
626        } else if (!activityRec.active() || _status == Idle) {
627            DPRINTF(O3CPU, "Idle!\n");
628            lastRunningCycle = curCycle();
629            timesIdled++;
630        } else {
631            schedule(tickEvent, clockEdge(Cycles(1)));
632            DPRINTF(O3CPU, "Scheduling next tick!\n");
633        }
634    }
635
636    if (!FullSystem)
637        updateThreadPriority();
638
639    tryDrain();
640}
641
642template <class Impl>
643void
644FullO3CPU<Impl>::init()
645{
646    BaseCPU::init();
647
648    for (ThreadID tid = 0; tid < numThreads; ++tid) {
649        // Set noSquashFromTC so that the CPU doesn't squash when initially
650        // setting up registers.
651        thread[tid]->noSquashFromTC = true;
652        // Initialise the ThreadContext's memory proxies
653        thread[tid]->initMemProxies(thread[tid]->getTC());
654    }
655
656    if (FullSystem && !params()->switched_out) {
657        for (ThreadID tid = 0; tid < numThreads; tid++) {
658            ThreadContext *src_tc = threadContexts[tid];
659            TheISA::initCPU(src_tc, src_tc->contextId());
660        }
661    }
662
663    // Clear noSquashFromTC.
664    for (int tid = 0; tid < numThreads; ++tid)
665        thread[tid]->noSquashFromTC = false;
666
667    commit.setThreads(thread);
668}
669
670template <class Impl>
671void
672FullO3CPU<Impl>::startup()
673{
674    BaseCPU::startup();
675    for (int tid = 0; tid < numThreads; ++tid)
676        isa[tid]->startup(threadContexts[tid]);
677
678    fetch.startupStage();
679    decode.startupStage();
680    iew.startupStage();
681    rename.startupStage();
682    commit.startupStage();
683}
684
685template <class Impl>
686void
687FullO3CPU<Impl>::activateThread(ThreadID tid)
688{
689    list<ThreadID>::iterator isActive =
690        std::find(activeThreads.begin(), activeThreads.end(), tid);
691
692    DPRINTF(O3CPU, "[tid:%i] Calling activate thread.\n", tid);
693    assert(!switchedOut());
694
695    if (isActive == activeThreads.end()) {
696        DPRINTF(O3CPU, "[tid:%i] Adding to active threads list\n",
697                tid);
698
699        activeThreads.push_back(tid);
700    }
701}
702
703template <class Impl>
704void
705FullO3CPU<Impl>::deactivateThread(ThreadID tid)
706{
707    //Remove From Active List, if Active
708    list<ThreadID>::iterator thread_it =
709        std::find(activeThreads.begin(), activeThreads.end(), tid);
710
711    DPRINTF(O3CPU, "[tid:%i] Calling deactivate thread.\n", tid);
712    assert(!switchedOut());
713
714    if (thread_it != activeThreads.end()) {
715        DPRINTF(O3CPU,"[tid:%i] Removing from active threads list\n",
716                tid);
717        activeThreads.erase(thread_it);
718    }
719
720    fetch.deactivateThread(tid);
721    commit.deactivateThread(tid);
722}
723
724template <class Impl>
725Counter
726FullO3CPU<Impl>::totalInsts() const
727{
728    Counter total(0);
729
730    ThreadID size = thread.size();
731    for (ThreadID i = 0; i < size; i++)
732        total += thread[i]->numInst;
733
734    return total;
735}
736
737template <class Impl>
738Counter
739FullO3CPU<Impl>::totalOps() const
740{
741    Counter total(0);
742
743    ThreadID size = thread.size();
744    for (ThreadID i = 0; i < size; i++)
745        total += thread[i]->numOp;
746
747    return total;
748}
749
750template <class Impl>
751void
752FullO3CPU<Impl>::activateContext(ThreadID tid)
753{
754    assert(!switchedOut());
755
756    // Needs to set each stage to running as well.
757    activateThread(tid);
758
759    // We don't want to wake the CPU if it is drained. In that case,
760    // we just want to flag the thread as active and schedule the tick
761    // event from drainResume() instead.
762    if (drainState() == DrainState::Drained)
763        return;
764
765    // If we are time 0 or if the last activation time is in the past,
766    // schedule the next tick and wake up the fetch unit
767    if (lastActivatedCycle == 0 || lastActivatedCycle < curTick()) {
768        scheduleTickEvent(Cycles(0));
769
770        // Be sure to signal that there's some activity so the CPU doesn't
771        // deschedule itself.
772        activityRec.activity();
773        fetch.wakeFromQuiesce();
774
775        Cycles cycles(curCycle() - lastRunningCycle);
776        // @todo: This is an oddity that is only here to match the stats
777        if (cycles != 0)
778            --cycles;
779        quiesceCycles += cycles;
780
781        lastActivatedCycle = curTick();
782
783        _status = Running;
784
785        BaseCPU::activateContext(tid);
786    }
787}
788
789template <class Impl>
790void
791FullO3CPU<Impl>::suspendContext(ThreadID tid)
792{
793    DPRINTF(O3CPU,"[tid:%i] Suspending Thread Context.\n", tid);
794    assert(!switchedOut());
795
796    deactivateThread(tid);
797
798    // If this was the last thread then unschedule the tick event.
799    if (activeThreads.size() == 0) {
800        unscheduleTickEvent();
801        lastRunningCycle = curCycle();
802        _status = Idle;
803    }
804
805    DPRINTF(Quiesce, "Suspending Context\n");
806
807    BaseCPU::suspendContext(tid);
808}
809
810template <class Impl>
811void
812FullO3CPU<Impl>::haltContext(ThreadID tid)
813{
814    //For now, this is the same as deallocate
815    DPRINTF(O3CPU,"[tid:%i] Halt Context called. Deallocating\n", tid);
816    assert(!switchedOut());
817
818    deactivateThread(tid);
819    removeThread(tid);
820
821    updateCycleCounters(BaseCPU::CPU_STATE_SLEEP);
822}
823
824template <class Impl>
825void
826FullO3CPU<Impl>::insertThread(ThreadID tid)
827{
828    DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
829    // Will change now that the PC and thread state is internal to the CPU
830    // and not in the ThreadContext.
831    ThreadContext *src_tc;
832    if (FullSystem)
833        src_tc = system->threadContexts[tid];
834    else
835        src_tc = tcBase(tid);
836
837    //Bind Int Regs to Rename Map
838
839    for (RegId reg_id(IntRegClass, 0); reg_id.index() < TheISA::NumIntRegs;
840         reg_id.index()++) {
841        PhysRegIdPtr phys_reg = freeList.getIntReg();
842        renameMap[tid].setEntry(reg_id, phys_reg);
843        scoreboard.setReg(phys_reg);
844    }
845
846    //Bind Float Regs to Rename Map
847    for (RegId reg_id(FloatRegClass, 0); reg_id.index() < TheISA::NumFloatRegs;
848         reg_id.index()++) {
849        PhysRegIdPtr phys_reg = freeList.getFloatReg();
850        renameMap[tid].setEntry(reg_id, phys_reg);
851        scoreboard.setReg(phys_reg);
852    }
853
854    //Bind condition-code Regs to Rename Map
855    for (RegId reg_id(CCRegClass, 0); reg_id.index() < TheISA::NumCCRegs;
856         reg_id.index()++) {
857        PhysRegIdPtr phys_reg = freeList.getCCReg();
858        renameMap[tid].setEntry(reg_id, phys_reg);
859        scoreboard.setReg(phys_reg);
860    }
861
862    //Copy Thread Data Into RegFile
863    //this->copyFromTC(tid);
864
865    //Set PC/NPC/NNPC
866    pcState(src_tc->pcState(), tid);
867
868    src_tc->setStatus(ThreadContext::Active);
869
870    activateContext(tid);
871
872    //Reset ROB/IQ/LSQ Entries
873    commit.rob->resetEntries();
874}
875
876template <class Impl>
877void
878FullO3CPU<Impl>::removeThread(ThreadID tid)
879{
880    DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
881
882    // Copy Thread Data From RegFile
883    // If thread is suspended, it might be re-allocated
884    // this->copyToTC(tid);
885
886
887    // @todo: 2-27-2008: Fix how we free up rename mappings
888    // here to alleviate the case for double-freeing registers
889    // in SMT workloads.
890
891    // clear all thread-specific states in each stage of the pipeline
892    // since this thread is going to be completely removed from the CPU
893    commit.clearStates(tid);
894    fetch.clearStates(tid);
895    decode.clearStates(tid);
896    rename.clearStates(tid);
897    iew.clearStates(tid);
898
899    // at this step, all instructions in the pipeline should be already
900    // either committed successfully or squashed. All thread-specific
901    // queues in the pipeline must be empty.
902    assert(iew.instQueue.getCount(tid) == 0);
903    assert(iew.ldstQueue.getCount(tid) == 0);
904    assert(commit.rob->isEmpty(tid));
905
906    // Reset ROB/IQ/LSQ Entries
907
908    // Commented out for now.  This should be possible to do by
909    // telling all the pipeline stages to drain first, and then
910    // checking until the drain completes.  Once the pipeline is
911    // drained, call resetEntries(). - 10-09-06 ktlim
912/*
913    if (activeThreads.size() >= 1) {
914        commit.rob->resetEntries();
915        iew.resetEntries();
916    }
917*/
918}
919
920template <class Impl>
921bool
922FullO3CPU<Impl>::simPalCheck(int palFunc, ThreadID tid)
923{
924#if THE_ISA == ALPHA_ISA
925    auto *stats = dynamic_cast<AlphaISA::Kernel::Statistics *>(
926            this->thread[tid]->kernelStats);
927    if (stats)
928        stats->callpal(palFunc, this->threadContexts[tid]);
929
930    switch (palFunc) {
931      case PAL::halt:
932        halt();
933        if (--System::numSystemsRunning == 0)
934            exitSimLoop("all cpus halted");
935        break;
936
937      case PAL::bpt:
938      case PAL::bugchk:
939        if (this->system->breakpoint())
940            return false;
941        break;
942    }
943#endif
944    return true;
945}
946
947template <class Impl>
948void
949FullO3CPU<Impl>::switchRenameMode(ThreadID tid, UnifiedFreeList* freelist)
950{
951    auto pc = this->pcState(tid);
952
953    // new_mode is the new vector renaming mode
954    auto new_mode = RenameMode<TheISA::ISA>::mode(pc);
955
956    // We update vecMode only if there has been a change
957    if (new_mode != vecMode) {
958        vecMode = new_mode;
959
960        renameMap[tid].switchMode(vecMode);
961        commitRenameMap[tid].switchMode(vecMode);
962        renameMap[tid].switchFreeList(freelist);
963    }
964}
965
966template <class Impl>
967Fault
968FullO3CPU<Impl>::getInterrupts()
969{
970    // Check if there are any outstanding interrupts
971    return this->interrupts[0]->getInterrupt(this->threadContexts[0]);
972}
973
974template <class Impl>
975void
976FullO3CPU<Impl>::processInterrupts(const Fault &interrupt)
977{
978    // Check for interrupts here.  For now can copy the code that
979    // exists within isa_fullsys_traits.hh.  Also assume that thread 0
980    // is the one that handles the interrupts.
981    // @todo: Possibly consolidate the interrupt checking code.
982    // @todo: Allow other threads to handle interrupts.
983
984    assert(interrupt != NoFault);
985    this->interrupts[0]->updateIntrInfo(this->threadContexts[0]);
986
987    DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name());
988    this->trap(interrupt, 0, nullptr);
989}
990
991template <class Impl>
992void
993FullO3CPU<Impl>::trap(const Fault &fault, ThreadID tid,
994                      const StaticInstPtr &inst)
995{
996    // Pass the thread's TC into the invoke method.
997    fault->invoke(this->threadContexts[tid], inst);
998}
999
1000template <class Impl>
1001void
1002FullO3CPU<Impl>::syscall(int64_t callnum, ThreadID tid, Fault *fault)
1003{
1004    DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid);
1005
1006    DPRINTF(Activity,"Activity: syscall() called.\n");
1007
1008    // Temporarily increase this by one to account for the syscall
1009    // instruction.
1010    ++(this->thread[tid]->funcExeInst);
1011
1012    // Execute the actual syscall.
1013    this->thread[tid]->syscall(callnum, fault);
1014
1015    // Decrease funcExeInst by one as the normal commit will handle
1016    // incrementing it.
1017    --(this->thread[tid]->funcExeInst);
1018}
1019
1020template <class Impl>
1021void
1022FullO3CPU<Impl>::serializeThread(CheckpointOut &cp, ThreadID tid) const
1023{
1024    thread[tid]->serialize(cp);
1025}
1026
1027template <class Impl>
1028void
1029FullO3CPU<Impl>::unserializeThread(CheckpointIn &cp, ThreadID tid)
1030{
1031    thread[tid]->unserialize(cp);
1032}
1033
1034template <class Impl>
1035DrainState
1036FullO3CPU<Impl>::drain()
1037{
1038    // Deschedule any power gating event (if any)
1039    deschedulePowerGatingEvent();
1040
1041    // If the CPU isn't doing anything, then return immediately.
1042    if (switchedOut())
1043        return DrainState::Drained;
1044
1045    DPRINTF(Drain, "Draining...\n");
1046
1047    // We only need to signal a drain to the commit stage as this
1048    // initiates squashing controls the draining. Once the commit
1049    // stage commits an instruction where it is safe to stop, it'll
1050    // squash the rest of the instructions in the pipeline and force
1051    // the fetch stage to stall. The pipeline will be drained once all
1052    // in-flight instructions have retired.
1053    commit.drain();
1054
1055    // Wake the CPU and record activity so everything can drain out if
1056    // the CPU was not able to immediately drain.
1057    if (!isDrained())  {
1058        // If a thread is suspended, wake it up so it can be drained
1059        for (auto t : threadContexts) {
1060            if (t->status() == ThreadContext::Suspended){
1061                DPRINTF(Drain, "Currently suspended so activate %i \n",
1062                        t->threadId());
1063                t->activate();
1064                // As the thread is now active, change the power state as well
1065                activateContext(t->threadId());
1066            }
1067        }
1068
1069        wakeCPU();
1070        activityRec.activity();
1071
1072        DPRINTF(Drain, "CPU not drained\n");
1073
1074        return DrainState::Draining;
1075    } else {
1076        DPRINTF(Drain, "CPU is already drained\n");
1077        if (tickEvent.scheduled())
1078            deschedule(tickEvent);
1079
1080        // Flush out any old data from the time buffers.  In
1081        // particular, there might be some data in flight from the
1082        // fetch stage that isn't visible in any of the CPU buffers we
1083        // test in isDrained().
1084        for (int i = 0; i < timeBuffer.getSize(); ++i) {
1085            timeBuffer.advance();
1086            fetchQueue.advance();
1087            decodeQueue.advance();
1088            renameQueue.advance();
1089            iewQueue.advance();
1090        }
1091
1092        drainSanityCheck();
1093        return DrainState::Drained;
1094    }
1095}
1096
1097template <class Impl>
1098bool
1099FullO3CPU<Impl>::tryDrain()
1100{
1101    if (drainState() != DrainState::Draining || !isDrained())
1102        return false;
1103
1104    if (tickEvent.scheduled())
1105        deschedule(tickEvent);
1106
1107    DPRINTF(Drain, "CPU done draining, processing drain event\n");
1108    signalDrainDone();
1109
1110    return true;
1111}
1112
1113template <class Impl>
1114void
1115FullO3CPU<Impl>::drainSanityCheck() const
1116{
1117    assert(isDrained());
1118    fetch.drainSanityCheck();
1119    decode.drainSanityCheck();
1120    rename.drainSanityCheck();
1121    iew.drainSanityCheck();
1122    commit.drainSanityCheck();
1123}
1124
1125template <class Impl>
1126bool
1127FullO3CPU<Impl>::isDrained() const
1128{
1129    bool drained(true);
1130
1131    if (!instList.empty() || !removeList.empty()) {
1132        DPRINTF(Drain, "Main CPU structures not drained.\n");
1133        drained = false;
1134    }
1135
1136    if (!fetch.isDrained()) {
1137        DPRINTF(Drain, "Fetch not drained.\n");
1138        drained = false;
1139    }
1140
1141    if (!decode.isDrained()) {
1142        DPRINTF(Drain, "Decode not drained.\n");
1143        drained = false;
1144    }
1145
1146    if (!rename.isDrained()) {
1147        DPRINTF(Drain, "Rename not drained.\n");
1148        drained = false;
1149    }
1150
1151    if (!iew.isDrained()) {
1152        DPRINTF(Drain, "IEW not drained.\n");
1153        drained = false;
1154    }
1155
1156    if (!commit.isDrained()) {
1157        DPRINTF(Drain, "Commit not drained.\n");
1158        drained = false;
1159    }
1160
1161    return drained;
1162}
1163
1164template <class Impl>
1165void
1166FullO3CPU<Impl>::commitDrained(ThreadID tid)
1167{
1168    fetch.drainStall(tid);
1169}
1170
1171template <class Impl>
1172void
1173FullO3CPU<Impl>::drainResume()
1174{
1175    if (switchedOut())
1176        return;
1177
1178    DPRINTF(Drain, "Resuming...\n");
1179    verifyMemoryMode();
1180
1181    fetch.drainResume();
1182    commit.drainResume();
1183
1184    _status = Idle;
1185    for (ThreadID i = 0; i < thread.size(); i++) {
1186        if (thread[i]->status() == ThreadContext::Active) {
1187            DPRINTF(Drain, "Activating thread: %i\n", i);
1188            activateThread(i);
1189            _status = Running;
1190        }
1191    }
1192
1193    assert(!tickEvent.scheduled());
1194    if (_status == Running)
1195        schedule(tickEvent, nextCycle());
1196
1197    // Reschedule any power gating event (if any)
1198    schedulePowerGatingEvent();
1199}
1200
1201template <class Impl>
1202void
1203FullO3CPU<Impl>::switchOut()
1204{
1205    DPRINTF(O3CPU, "Switching out\n");
1206    BaseCPU::switchOut();
1207
1208    activityRec.reset();
1209
1210    _status = SwitchedOut;
1211
1212    if (checker)
1213        checker->switchOut();
1214}
1215
1216template <class Impl>
1217void
1218FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
1219{
1220    BaseCPU::takeOverFrom(oldCPU);
1221
1222    fetch.takeOverFrom();
1223    decode.takeOverFrom();
1224    rename.takeOverFrom();
1225    iew.takeOverFrom();
1226    commit.takeOverFrom();
1227
1228    assert(!tickEvent.scheduled());
1229
1230    FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU);
1231    if (oldO3CPU)
1232        globalSeqNum = oldO3CPU->globalSeqNum;
1233
1234    lastRunningCycle = curCycle();
1235    _status = Idle;
1236}
1237
1238template <class Impl>
1239void
1240FullO3CPU<Impl>::verifyMemoryMode() const
1241{
1242    if (!system->isTimingMode()) {
1243        fatal("The O3 CPU requires the memory system to be in "
1244              "'timing' mode.\n");
1245    }
1246}
1247
1248template <class Impl>
1249RegVal
1250FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid) const
1251{
1252    return this->isa[tid]->readMiscRegNoEffect(misc_reg);
1253}
1254
1255template <class Impl>
1256RegVal
1257FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid)
1258{
1259    miscRegfileReads++;
1260    return this->isa[tid]->readMiscReg(misc_reg, tcBase(tid));
1261}
1262
1263template <class Impl>
1264void
1265FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg, RegVal val, ThreadID tid)
1266{
1267    this->isa[tid]->setMiscRegNoEffect(misc_reg, val);
1268}
1269
1270template <class Impl>
1271void
1272FullO3CPU<Impl>::setMiscReg(int misc_reg, RegVal val, ThreadID tid)
1273{
1274    miscRegfileWrites++;
1275    this->isa[tid]->setMiscReg(misc_reg, val, tcBase(tid));
1276}
1277
1278template <class Impl>
1279RegVal
1280FullO3CPU<Impl>::readIntReg(PhysRegIdPtr phys_reg)
1281{
1282    intRegfileReads++;
1283    return regFile.readIntReg(phys_reg);
1284}
1285
1286template <class Impl>
1287RegVal
1288FullO3CPU<Impl>::readFloatReg(PhysRegIdPtr phys_reg)
1289{
1290    fpRegfileReads++;
1291    return regFile.readFloatReg(phys_reg);
1292}
1293
1294template <class Impl>
1295auto
1296FullO3CPU<Impl>::readVecReg(PhysRegIdPtr phys_reg) const
1297        -> const VecRegContainer&
1298{
1299    vecRegfileReads++;
1300    return regFile.readVecReg(phys_reg);
1301}
1302
1303template <class Impl>
1304auto
1305FullO3CPU<Impl>::getWritableVecReg(PhysRegIdPtr phys_reg)
1306        -> VecRegContainer&
1307{
1308    vecRegfileWrites++;
1309    return regFile.getWritableVecReg(phys_reg);
1310}
1311
1312template <class Impl>
1313auto
1314FullO3CPU<Impl>::readVecElem(PhysRegIdPtr phys_reg) const -> const VecElem&
1315{
1316    vecRegfileReads++;
1317    return regFile.readVecElem(phys_reg);
1318}
1319
1320template <class Impl>
1321auto
1322FullO3CPU<Impl>::readVecPredReg(PhysRegIdPtr phys_reg) const
1323        -> const VecPredRegContainer&
1324{
1325    vecPredRegfileReads++;
1326    return regFile.readVecPredReg(phys_reg);
1327}
1328
1329template <class Impl>
1330auto
1331FullO3CPU<Impl>::getWritableVecPredReg(PhysRegIdPtr phys_reg)
1332        -> VecPredRegContainer&
1333{
1334    vecPredRegfileWrites++;
1335    return regFile.getWritableVecPredReg(phys_reg);
1336}
1337
1338template <class Impl>
1339RegVal
1340FullO3CPU<Impl>::readCCReg(PhysRegIdPtr phys_reg)
1341{
1342    ccRegfileReads++;
1343    return regFile.readCCReg(phys_reg);
1344}
1345
1346template <class Impl>
1347void
1348FullO3CPU<Impl>::setIntReg(PhysRegIdPtr phys_reg, RegVal val)
1349{
1350    intRegfileWrites++;
1351    regFile.setIntReg(phys_reg, val);
1352}
1353
1354template <class Impl>
1355void
1356FullO3CPU<Impl>::setFloatReg(PhysRegIdPtr phys_reg, RegVal val)
1357{
1358    fpRegfileWrites++;
1359    regFile.setFloatReg(phys_reg, val);
1360}
1361
1362template <class Impl>
1363void
1364FullO3CPU<Impl>::setVecReg(PhysRegIdPtr phys_reg, const VecRegContainer& val)
1365{
1366    vecRegfileWrites++;
1367    regFile.setVecReg(phys_reg, val);
1368}
1369
1370template <class Impl>
1371void
1372FullO3CPU<Impl>::setVecElem(PhysRegIdPtr phys_reg, const VecElem& val)
1373{
1374    vecRegfileWrites++;
1375    regFile.setVecElem(phys_reg, val);
1376}
1377
1378template <class Impl>
1379void
1380FullO3CPU<Impl>::setVecPredReg(PhysRegIdPtr phys_reg,
1381                               const VecPredRegContainer& val)
1382{
1383    vecPredRegfileWrites++;
1384    regFile.setVecPredReg(phys_reg, val);
1385}
1386
1387template <class Impl>
1388void
1389FullO3CPU<Impl>::setCCReg(PhysRegIdPtr phys_reg, RegVal val)
1390{
1391    ccRegfileWrites++;
1392    regFile.setCCReg(phys_reg, val);
1393}
1394
1395template <class Impl>
1396RegVal
1397FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid)
1398{
1399    intRegfileReads++;
1400    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1401            RegId(IntRegClass, reg_idx));
1402
1403    return regFile.readIntReg(phys_reg);
1404}
1405
1406template <class Impl>
1407RegVal
1408FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid)
1409{
1410    fpRegfileReads++;
1411    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1412        RegId(FloatRegClass, reg_idx));
1413
1414    return regFile.readFloatReg(phys_reg);
1415}
1416
1417template <class Impl>
1418auto
1419FullO3CPU<Impl>::readArchVecReg(int reg_idx, ThreadID tid) const
1420        -> const VecRegContainer&
1421{
1422    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1423                RegId(VecRegClass, reg_idx));
1424    return readVecReg(phys_reg);
1425}
1426
1427template <class Impl>
1428auto
1429FullO3CPU<Impl>::getWritableArchVecReg(int reg_idx, ThreadID tid)
1430        -> VecRegContainer&
1431{
1432    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1433                RegId(VecRegClass, reg_idx));
1434    return getWritableVecReg(phys_reg);
1435}
1436
1437template <class Impl>
1438auto
1439FullO3CPU<Impl>::readArchVecElem(const RegIndex& reg_idx, const ElemIndex& ldx,
1440                                 ThreadID tid) const -> const VecElem&
1441{
1442    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1443                                RegId(VecElemClass, reg_idx, ldx));
1444    return readVecElem(phys_reg);
1445}
1446
1447template <class Impl>
1448auto
1449FullO3CPU<Impl>::readArchVecPredReg(int reg_idx, ThreadID tid) const
1450        -> const VecPredRegContainer&
1451{
1452    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1453                RegId(VecPredRegClass, reg_idx));
1454    return readVecPredReg(phys_reg);
1455}
1456
1457template <class Impl>
1458auto
1459FullO3CPU<Impl>::getWritableArchVecPredReg(int reg_idx, ThreadID tid)
1460        -> VecPredRegContainer&
1461{
1462    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1463                RegId(VecPredRegClass, reg_idx));
1464    return getWritableVecPredReg(phys_reg);
1465}
1466
1467template <class Impl>
1468RegVal
1469FullO3CPU<Impl>::readArchCCReg(int reg_idx, ThreadID tid)
1470{
1471    ccRegfileReads++;
1472    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1473        RegId(CCRegClass, reg_idx));
1474
1475    return regFile.readCCReg(phys_reg);
1476}
1477
1478template <class Impl>
1479void
1480FullO3CPU<Impl>::setArchIntReg(int reg_idx, RegVal val, ThreadID tid)
1481{
1482    intRegfileWrites++;
1483    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1484            RegId(IntRegClass, reg_idx));
1485
1486    regFile.setIntReg(phys_reg, val);
1487}
1488
1489template <class Impl>
1490void
1491FullO3CPU<Impl>::setArchFloatReg(int reg_idx, RegVal val, ThreadID tid)
1492{
1493    fpRegfileWrites++;
1494    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1495            RegId(FloatRegClass, reg_idx));
1496
1497    regFile.setFloatReg(phys_reg, val);
1498}
1499
1500template <class Impl>
1501void
1502FullO3CPU<Impl>::setArchVecReg(int reg_idx, const VecRegContainer& val,
1503                               ThreadID tid)
1504{
1505    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1506                RegId(VecRegClass, reg_idx));
1507    setVecReg(phys_reg, val);
1508}
1509
1510template <class Impl>
1511void
1512FullO3CPU<Impl>::setArchVecElem(const RegIndex& reg_idx, const ElemIndex& ldx,
1513                                const VecElem& val, ThreadID tid)
1514{
1515    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1516                RegId(VecElemClass, reg_idx, ldx));
1517    setVecElem(phys_reg, val);
1518}
1519
1520template <class Impl>
1521void
1522FullO3CPU<Impl>::setArchVecPredReg(int reg_idx, const VecPredRegContainer& val,
1523                                   ThreadID tid)
1524{
1525    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1526                RegId(VecPredRegClass, reg_idx));
1527    setVecPredReg(phys_reg, val);
1528}
1529
1530template <class Impl>
1531void
1532FullO3CPU<Impl>::setArchCCReg(int reg_idx, RegVal val, ThreadID tid)
1533{
1534    ccRegfileWrites++;
1535    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1536            RegId(CCRegClass, reg_idx));
1537
1538    regFile.setCCReg(phys_reg, val);
1539}
1540
1541template <class Impl>
1542TheISA::PCState
1543FullO3CPU<Impl>::pcState(ThreadID tid)
1544{
1545    return commit.pcState(tid);
1546}
1547
1548template <class Impl>
1549void
1550FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid)
1551{
1552    commit.pcState(val, tid);
1553}
1554
1555template <class Impl>
1556Addr
1557FullO3CPU<Impl>::instAddr(ThreadID tid)
1558{
1559    return commit.instAddr(tid);
1560}
1561
1562template <class Impl>
1563Addr
1564FullO3CPU<Impl>::nextInstAddr(ThreadID tid)
1565{
1566    return commit.nextInstAddr(tid);
1567}
1568
1569template <class Impl>
1570MicroPC
1571FullO3CPU<Impl>::microPC(ThreadID tid)
1572{
1573    return commit.microPC(tid);
1574}
1575
1576template <class Impl>
1577void
1578FullO3CPU<Impl>::squashFromTC(ThreadID tid)
1579{
1580    this->thread[tid]->noSquashFromTC = true;
1581    this->commit.generateTCEvent(tid);
1582}
1583
1584template <class Impl>
1585typename FullO3CPU<Impl>::ListIt
1586FullO3CPU<Impl>::addInst(const DynInstPtr &inst)
1587{
1588    instList.push_back(inst);
1589
1590    return --(instList.end());
1591}
1592
1593template <class Impl>
1594void
1595FullO3CPU<Impl>::instDone(ThreadID tid, const DynInstPtr &inst)
1596{
1597    // Keep an instruction count.
1598    if (!inst->isMicroop() || inst->isLastMicroop()) {
1599        thread[tid]->numInst++;
1600        thread[tid]->numInsts++;
1601        committedInsts[tid]++;
1602        system->totalNumInsts++;
1603
1604        // Check for instruction-count-based events.
1605        comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1606        system->instEventQueue.serviceEvents(system->totalNumInsts);
1607    }
1608    thread[tid]->numOp++;
1609    thread[tid]->numOps++;
1610    committedOps[tid]++;
1611
1612    probeInstCommit(inst->staticInst, inst->instAddr());
1613}
1614
1615template <class Impl>
1616void
1617FullO3CPU<Impl>::removeFrontInst(const DynInstPtr &inst)
1618{
1619    DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s "
1620            "[sn:%lli]\n",
1621            inst->threadNumber, inst->pcState(), inst->seqNum);
1622
1623    removeInstsThisCycle = true;
1624
1625    // Remove the front instruction.
1626    removeList.push(inst->getInstListIt());
1627}
1628
1629template <class Impl>
1630void
1631FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid)
1632{
1633    DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1634            " list.\n", tid);
1635
1636    ListIt end_it;
1637
1638    bool rob_empty = false;
1639
1640    if (instList.empty()) {
1641        return;
1642    } else if (rob.isEmpty(tid)) {
1643        DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1644        end_it = instList.begin();
1645        rob_empty = true;
1646    } else {
1647        end_it = (rob.readTailInst(tid))->getInstListIt();
1648        DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1649    }
1650
1651    removeInstsThisCycle = true;
1652
1653    ListIt inst_it = instList.end();
1654
1655    inst_it--;
1656
1657    // Walk through the instruction list, removing any instructions
1658    // that were inserted after the given instruction iterator, end_it.
1659    while (inst_it != end_it) {
1660        assert(!instList.empty());
1661
1662        squashInstIt(inst_it, tid);
1663
1664        inst_it--;
1665    }
1666
1667    // If the ROB was empty, then we actually need to remove the first
1668    // instruction as well.
1669    if (rob_empty) {
1670        squashInstIt(inst_it, tid);
1671    }
1672}
1673
1674template <class Impl>
1675void
1676FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid)
1677{
1678    assert(!instList.empty());
1679
1680    removeInstsThisCycle = true;
1681
1682    ListIt inst_iter = instList.end();
1683
1684    inst_iter--;
1685
1686    DPRINTF(O3CPU, "Deleting instructions from instruction "
1687            "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1688            tid, seq_num, (*inst_iter)->seqNum);
1689
1690    while ((*inst_iter)->seqNum > seq_num) {
1691
1692        bool break_loop = (inst_iter == instList.begin());
1693
1694        squashInstIt(inst_iter, tid);
1695
1696        inst_iter--;
1697
1698        if (break_loop)
1699            break;
1700    }
1701}
1702
1703template <class Impl>
1704inline void
1705FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid)
1706{
1707    if ((*instIt)->threadNumber == tid) {
1708        DPRINTF(O3CPU, "Squashing instruction, "
1709                "[tid:%i] [sn:%lli] PC %s\n",
1710                (*instIt)->threadNumber,
1711                (*instIt)->seqNum,
1712                (*instIt)->pcState());
1713
1714        // Mark it as squashed.
1715        (*instIt)->setSquashed();
1716
1717        // @todo: Formulate a consistent method for deleting
1718        // instructions from the instruction list
1719        // Remove the instruction from the list.
1720        removeList.push(instIt);
1721    }
1722}
1723
1724template <class Impl>
1725void
1726FullO3CPU<Impl>::cleanUpRemovedInsts()
1727{
1728    while (!removeList.empty()) {
1729        DPRINTF(O3CPU, "Removing instruction, "
1730                "[tid:%i] [sn:%lli] PC %s\n",
1731                (*removeList.front())->threadNumber,
1732                (*removeList.front())->seqNum,
1733                (*removeList.front())->pcState());
1734
1735        instList.erase(removeList.front());
1736
1737        removeList.pop();
1738    }
1739
1740    removeInstsThisCycle = false;
1741}
1742/*
1743template <class Impl>
1744void
1745FullO3CPU<Impl>::removeAllInsts()
1746{
1747    instList.clear();
1748}
1749*/
1750template <class Impl>
1751void
1752FullO3CPU<Impl>::dumpInsts()
1753{
1754    int num = 0;
1755
1756    ListIt inst_list_it = instList.begin();
1757
1758    cprintf("Dumping Instruction List\n");
1759
1760    while (inst_list_it != instList.end()) {
1761        cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1762                "Squashed:%i\n\n",
1763                num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber,
1764                (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1765                (*inst_list_it)->isSquashed());
1766        inst_list_it++;
1767        ++num;
1768    }
1769}
1770/*
1771template <class Impl>
1772void
1773FullO3CPU<Impl>::wakeDependents(const DynInstPtr &inst)
1774{
1775    iew.wakeDependents(inst);
1776}
1777*/
1778template <class Impl>
1779void
1780FullO3CPU<Impl>::wakeCPU()
1781{
1782    if (activityRec.active() || tickEvent.scheduled()) {
1783        DPRINTF(Activity, "CPU already running.\n");
1784        return;
1785    }
1786
1787    DPRINTF(Activity, "Waking up CPU\n");
1788
1789    Cycles cycles(curCycle() - lastRunningCycle);
1790    // @todo: This is an oddity that is only here to match the stats
1791    if (cycles > 1) {
1792        --cycles;
1793        idleCycles += cycles;
1794        numCycles += cycles;
1795    }
1796
1797    schedule(tickEvent, clockEdge());
1798}
1799
1800template <class Impl>
1801void
1802FullO3CPU<Impl>::wakeup(ThreadID tid)
1803{
1804    if (this->thread[tid]->status() != ThreadContext::Suspended)
1805        return;
1806
1807    this->wakeCPU();
1808
1809    DPRINTF(Quiesce, "Suspended Processor woken\n");
1810    this->threadContexts[tid]->activate();
1811}
1812
1813template <class Impl>
1814ThreadID
1815FullO3CPU<Impl>::getFreeTid()
1816{
1817    for (ThreadID tid = 0; tid < numThreads; tid++) {
1818        if (!tids[tid]) {
1819            tids[tid] = true;
1820            return tid;
1821        }
1822    }
1823
1824    return InvalidThreadID;
1825}
1826
1827template <class Impl>
1828void
1829FullO3CPU<Impl>::updateThreadPriority()
1830{
1831    if (activeThreads.size() > 1) {
1832        //DEFAULT TO ROUND ROBIN SCHEME
1833        //e.g. Move highest priority to end of thread list
1834        list<ThreadID>::iterator list_begin = activeThreads.begin();
1835
1836        unsigned high_thread = *list_begin;
1837
1838        activeThreads.erase(list_begin);
1839
1840        activeThreads.push_back(high_thread);
1841    }
1842}
1843
1844template <class Impl>
1845void
1846FullO3CPU<Impl>::addThreadToExitingList(ThreadID tid)
1847{
1848    DPRINTF(O3CPU, "Thread %d is inserted to exitingThreads list\n", tid);
1849
1850    // the thread trying to exit can't be already halted
1851    assert(tcBase(tid)->status() != ThreadContext::Halted);
1852
1853    // make sure the thread has not been added to the list yet
1854    assert(exitingThreads.count(tid) == 0);
1855
1856    // add the thread to exitingThreads list to mark that this thread is
1857    // trying to exit. The boolean value in the pair denotes if a thread is
1858    // ready to exit. The thread is not ready to exit until the corresponding
1859    // exit trap event is processed in the future. Until then, it'll be still
1860    // an active thread that is trying to exit.
1861    exitingThreads.emplace(std::make_pair(tid, false));
1862}
1863
1864template <class Impl>
1865bool
1866FullO3CPU<Impl>::isThreadExiting(ThreadID tid) const
1867{
1868    return exitingThreads.count(tid) == 1;
1869}
1870
1871template <class Impl>
1872void
1873FullO3CPU<Impl>::scheduleThreadExitEvent(ThreadID tid)
1874{
1875    assert(exitingThreads.count(tid) == 1);
1876
1877    // exit trap event has been processed. Now, the thread is ready to exit
1878    // and be removed from the CPU.
1879    exitingThreads[tid] = true;
1880
1881    // we schedule a threadExitEvent in the next cycle to properly clean
1882    // up the thread's states in the pipeline. threadExitEvent has lower
1883    // priority than tickEvent, so the cleanup will happen at the very end
1884    // of the next cycle after all pipeline stages complete their operations.
1885    // We want all stages to complete squashing instructions before doing
1886    // the cleanup.
1887    if (!threadExitEvent.scheduled()) {
1888        schedule(threadExitEvent, nextCycle());
1889    }
1890}
1891
1892template <class Impl>
1893void
1894FullO3CPU<Impl>::exitThreads()
1895{
1896    // there must be at least one thread trying to exit
1897    assert(exitingThreads.size() > 0);
1898
1899    // terminate all threads that are ready to exit
1900    auto it = exitingThreads.begin();
1901    while (it != exitingThreads.end()) {
1902        ThreadID thread_id = it->first;
1903        bool readyToExit = it->second;
1904
1905        if (readyToExit) {
1906            DPRINTF(O3CPU, "Exiting thread %d\n", thread_id);
1907            haltContext(thread_id);
1908            tcBase(thread_id)->setStatus(ThreadContext::Halted);
1909            it = exitingThreads.erase(it);
1910        } else {
1911            it++;
1912        }
1913    }
1914}
1915
1916// Forward declaration of FullO3CPU.
1917template class FullO3CPU<O3CPUImpl>;
1918