cpu.cc revision 13644 
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>
921Fault
922FullO3CPU<Impl>::hwrei(ThreadID tid)
923{
924#if THE_ISA == ALPHA_ISA
925    // Need to clear the lock flag upon returning from an interrupt.
926    this->setMiscRegNoEffect(AlphaISA::MISCREG_LOCKFLAG, false, tid);
927
928    this->thread[tid]->kernelStats->hwrei();
929
930    // FIXME: XXX check for interrupts? XXX
931#endif
932    return NoFault;
933}
934
935template <class Impl>
936bool
937FullO3CPU<Impl>::simPalCheck(int palFunc, ThreadID tid)
938{
939#if THE_ISA == ALPHA_ISA
940    if (this->thread[tid]->kernelStats)
941        this->thread[tid]->kernelStats->callpal(palFunc,
942                                                this->threadContexts[tid]);
943
944    switch (palFunc) {
945      case PAL::halt:
946        halt();
947        if (--System::numSystemsRunning == 0)
948            exitSimLoop("all cpus halted");
949        break;
950
951      case PAL::bpt:
952      case PAL::bugchk:
953        if (this->system->breakpoint())
954            return false;
955        break;
956    }
957#endif
958    return true;
959}
960
961template <class Impl>
962void
963FullO3CPU<Impl>::switchRenameMode(ThreadID tid, UnifiedFreeList* freelist)
964{
965    auto pc = this->pcState(tid);
966
967    // new_mode is the new vector renaming mode
968    auto new_mode = RenameMode<TheISA::ISA>::mode(pc);
969
970    // We update vecMode only if there has been a change
971    if (new_mode != vecMode) {
972        vecMode = new_mode;
973
974        renameMap[tid].switchMode(vecMode);
975        commitRenameMap[tid].switchMode(vecMode);
976        renameMap[tid].switchFreeList(freelist);
977    }
978}
979
980template <class Impl>
981Fault
982FullO3CPU<Impl>::getInterrupts()
983{
984    // Check if there are any outstanding interrupts
985    return this->interrupts[0]->getInterrupt(this->threadContexts[0]);
986}
987
988template <class Impl>
989void
990FullO3CPU<Impl>::processInterrupts(const Fault &interrupt)
991{
992    // Check for interrupts here.  For now can copy the code that
993    // exists within isa_fullsys_traits.hh.  Also assume that thread 0
994    // is the one that handles the interrupts.
995    // @todo: Possibly consolidate the interrupt checking code.
996    // @todo: Allow other threads to handle interrupts.
997
998    assert(interrupt != NoFault);
999    this->interrupts[0]->updateIntrInfo(this->threadContexts[0]);
1000
1001    DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name());
1002    this->trap(interrupt, 0, nullptr);
1003}
1004
1005template <class Impl>
1006void
1007FullO3CPU<Impl>::trap(const Fault &fault, ThreadID tid,
1008                      const StaticInstPtr &inst)
1009{
1010    // Pass the thread's TC into the invoke method.
1011    fault->invoke(this->threadContexts[tid], inst);
1012}
1013
1014template <class Impl>
1015void
1016FullO3CPU<Impl>::syscall(int64_t callnum, ThreadID tid, Fault *fault)
1017{
1018    DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid);
1019
1020    DPRINTF(Activity,"Activity: syscall() called.\n");
1021
1022    // Temporarily increase this by one to account for the syscall
1023    // instruction.
1024    ++(this->thread[tid]->funcExeInst);
1025
1026    // Execute the actual syscall.
1027    this->thread[tid]->syscall(callnum, fault);
1028
1029    // Decrease funcExeInst by one as the normal commit will handle
1030    // incrementing it.
1031    --(this->thread[tid]->funcExeInst);
1032}
1033
1034template <class Impl>
1035void
1036FullO3CPU<Impl>::serializeThread(CheckpointOut &cp, ThreadID tid) const
1037{
1038    thread[tid]->serialize(cp);
1039}
1040
1041template <class Impl>
1042void
1043FullO3CPU<Impl>::unserializeThread(CheckpointIn &cp, ThreadID tid)
1044{
1045    thread[tid]->unserialize(cp);
1046}
1047
1048template <class Impl>
1049DrainState
1050FullO3CPU<Impl>::drain()
1051{
1052    // Deschedule any power gating event (if any)
1053    deschedulePowerGatingEvent();
1054
1055    // If the CPU isn't doing anything, then return immediately.
1056    if (switchedOut())
1057        return DrainState::Drained;
1058
1059    DPRINTF(Drain, "Draining...\n");
1060
1061    // We only need to signal a drain to the commit stage as this
1062    // initiates squashing controls the draining. Once the commit
1063    // stage commits an instruction where it is safe to stop, it'll
1064    // squash the rest of the instructions in the pipeline and force
1065    // the fetch stage to stall. The pipeline will be drained once all
1066    // in-flight instructions have retired.
1067    commit.drain();
1068
1069    // Wake the CPU and record activity so everything can drain out if
1070    // the CPU was not able to immediately drain.
1071    if (!isDrained())  {
1072        // If a thread is suspended, wake it up so it can be drained
1073        for (auto t : threadContexts) {
1074            if (t->status() == ThreadContext::Suspended){
1075                DPRINTF(Drain, "Currently suspended so activate %i \n",
1076                        t->threadId());
1077                t->activate();
1078                // As the thread is now active, change the power state as well
1079                activateContext(t->threadId());
1080            }
1081        }
1082
1083        wakeCPU();
1084        activityRec.activity();
1085
1086        DPRINTF(Drain, "CPU not drained\n");
1087
1088        return DrainState::Draining;
1089    } else {
1090        DPRINTF(Drain, "CPU is already drained\n");
1091        if (tickEvent.scheduled())
1092            deschedule(tickEvent);
1093
1094        // Flush out any old data from the time buffers.  In
1095        // particular, there might be some data in flight from the
1096        // fetch stage that isn't visible in any of the CPU buffers we
1097        // test in isDrained().
1098        for (int i = 0; i < timeBuffer.getSize(); ++i) {
1099            timeBuffer.advance();
1100            fetchQueue.advance();
1101            decodeQueue.advance();
1102            renameQueue.advance();
1103            iewQueue.advance();
1104        }
1105
1106        drainSanityCheck();
1107        return DrainState::Drained;
1108    }
1109}
1110
1111template <class Impl>
1112bool
1113FullO3CPU<Impl>::tryDrain()
1114{
1115    if (drainState() != DrainState::Draining || !isDrained())
1116        return false;
1117
1118    if (tickEvent.scheduled())
1119        deschedule(tickEvent);
1120
1121    DPRINTF(Drain, "CPU done draining, processing drain event\n");
1122    signalDrainDone();
1123
1124    return true;
1125}
1126
1127template <class Impl>
1128void
1129FullO3CPU<Impl>::drainSanityCheck() const
1130{
1131    assert(isDrained());
1132    fetch.drainSanityCheck();
1133    decode.drainSanityCheck();
1134    rename.drainSanityCheck();
1135    iew.drainSanityCheck();
1136    commit.drainSanityCheck();
1137}
1138
1139template <class Impl>
1140bool
1141FullO3CPU<Impl>::isDrained() const
1142{
1143    bool drained(true);
1144
1145    if (!instList.empty() || !removeList.empty()) {
1146        DPRINTF(Drain, "Main CPU structures not drained.\n");
1147        drained = false;
1148    }
1149
1150    if (!fetch.isDrained()) {
1151        DPRINTF(Drain, "Fetch not drained.\n");
1152        drained = false;
1153    }
1154
1155    if (!decode.isDrained()) {
1156        DPRINTF(Drain, "Decode not drained.\n");
1157        drained = false;
1158    }
1159
1160    if (!rename.isDrained()) {
1161        DPRINTF(Drain, "Rename not drained.\n");
1162        drained = false;
1163    }
1164
1165    if (!iew.isDrained()) {
1166        DPRINTF(Drain, "IEW not drained.\n");
1167        drained = false;
1168    }
1169
1170    if (!commit.isDrained()) {
1171        DPRINTF(Drain, "Commit not drained.\n");
1172        drained = false;
1173    }
1174
1175    return drained;
1176}
1177
1178template <class Impl>
1179void
1180FullO3CPU<Impl>::commitDrained(ThreadID tid)
1181{
1182    fetch.drainStall(tid);
1183}
1184
1185template <class Impl>
1186void
1187FullO3CPU<Impl>::drainResume()
1188{
1189    if (switchedOut())
1190        return;
1191
1192    DPRINTF(Drain, "Resuming...\n");
1193    verifyMemoryMode();
1194
1195    fetch.drainResume();
1196    commit.drainResume();
1197
1198    _status = Idle;
1199    for (ThreadID i = 0; i < thread.size(); i++) {
1200        if (thread[i]->status() == ThreadContext::Active) {
1201            DPRINTF(Drain, "Activating thread: %i\n", i);
1202            activateThread(i);
1203            _status = Running;
1204        }
1205    }
1206
1207    assert(!tickEvent.scheduled());
1208    if (_status == Running)
1209        schedule(tickEvent, nextCycle());
1210
1211    // Reschedule any power gating event (if any)
1212    schedulePowerGatingEvent();
1213}
1214
1215template <class Impl>
1216void
1217FullO3CPU<Impl>::switchOut()
1218{
1219    DPRINTF(O3CPU, "Switching out\n");
1220    BaseCPU::switchOut();
1221
1222    activityRec.reset();
1223
1224    _status = SwitchedOut;
1225
1226    if (checker)
1227        checker->switchOut();
1228}
1229
1230template <class Impl>
1231void
1232FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
1233{
1234    BaseCPU::takeOverFrom(oldCPU);
1235
1236    fetch.takeOverFrom();
1237    decode.takeOverFrom();
1238    rename.takeOverFrom();
1239    iew.takeOverFrom();
1240    commit.takeOverFrom();
1241
1242    assert(!tickEvent.scheduled());
1243
1244    FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU);
1245    if (oldO3CPU)
1246        globalSeqNum = oldO3CPU->globalSeqNum;
1247
1248    lastRunningCycle = curCycle();
1249    _status = Idle;
1250}
1251
1252template <class Impl>
1253void
1254FullO3CPU<Impl>::verifyMemoryMode() const
1255{
1256    if (!system->isTimingMode()) {
1257        fatal("The O3 CPU requires the memory system to be in "
1258              "'timing' mode.\n");
1259    }
1260}
1261
1262template <class Impl>
1263RegVal
1264FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid) const
1265{
1266    return this->isa[tid]->readMiscRegNoEffect(misc_reg);
1267}
1268
1269template <class Impl>
1270RegVal
1271FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid)
1272{
1273    miscRegfileReads++;
1274    return this->isa[tid]->readMiscReg(misc_reg, tcBase(tid));
1275}
1276
1277template <class Impl>
1278void
1279FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg, RegVal val, ThreadID tid)
1280{
1281    this->isa[tid]->setMiscRegNoEffect(misc_reg, val);
1282}
1283
1284template <class Impl>
1285void
1286FullO3CPU<Impl>::setMiscReg(int misc_reg, RegVal val, ThreadID tid)
1287{
1288    miscRegfileWrites++;
1289    this->isa[tid]->setMiscReg(misc_reg, val, tcBase(tid));
1290}
1291
1292template <class Impl>
1293RegVal
1294FullO3CPU<Impl>::readIntReg(PhysRegIdPtr phys_reg)
1295{
1296    intRegfileReads++;
1297    return regFile.readIntReg(phys_reg);
1298}
1299
1300template <class Impl>
1301RegVal
1302FullO3CPU<Impl>::readFloatReg(PhysRegIdPtr phys_reg)
1303{
1304    fpRegfileReads++;
1305    return regFile.readFloatReg(phys_reg);
1306}
1307
1308template <class Impl>
1309auto
1310FullO3CPU<Impl>::readVecReg(PhysRegIdPtr phys_reg) const
1311        -> const VecRegContainer&
1312{
1313    vecRegfileReads++;
1314    return regFile.readVecReg(phys_reg);
1315}
1316
1317template <class Impl>
1318auto
1319FullO3CPU<Impl>::getWritableVecReg(PhysRegIdPtr phys_reg)
1320        -> VecRegContainer&
1321{
1322    vecRegfileWrites++;
1323    return regFile.getWritableVecReg(phys_reg);
1324}
1325
1326template <class Impl>
1327auto
1328FullO3CPU<Impl>::readVecElem(PhysRegIdPtr phys_reg) const -> const VecElem&
1329{
1330    vecRegfileReads++;
1331    return regFile.readVecElem(phys_reg);
1332}
1333
1334template <class Impl>
1335auto
1336FullO3CPU<Impl>::readVecPredReg(PhysRegIdPtr phys_reg) const
1337        -> const VecPredRegContainer&
1338{
1339    vecPredRegfileReads++;
1340    return regFile.readVecPredReg(phys_reg);
1341}
1342
1343template <class Impl>
1344auto
1345FullO3CPU<Impl>::getWritableVecPredReg(PhysRegIdPtr phys_reg)
1346        -> VecPredRegContainer&
1347{
1348    vecPredRegfileWrites++;
1349    return regFile.getWritableVecPredReg(phys_reg);
1350}
1351
1352template <class Impl>
1353RegVal
1354FullO3CPU<Impl>::readCCReg(PhysRegIdPtr phys_reg)
1355{
1356    ccRegfileReads++;
1357    return regFile.readCCReg(phys_reg);
1358}
1359
1360template <class Impl>
1361void
1362FullO3CPU<Impl>::setIntReg(PhysRegIdPtr phys_reg, RegVal val)
1363{
1364    intRegfileWrites++;
1365    regFile.setIntReg(phys_reg, val);
1366}
1367
1368template <class Impl>
1369void
1370FullO3CPU<Impl>::setFloatReg(PhysRegIdPtr phys_reg, RegVal val)
1371{
1372    fpRegfileWrites++;
1373    regFile.setFloatReg(phys_reg, val);
1374}
1375
1376template <class Impl>
1377void
1378FullO3CPU<Impl>::setVecReg(PhysRegIdPtr phys_reg, const VecRegContainer& val)
1379{
1380    vecRegfileWrites++;
1381    regFile.setVecReg(phys_reg, val);
1382}
1383
1384template <class Impl>
1385void
1386FullO3CPU<Impl>::setVecElem(PhysRegIdPtr phys_reg, const VecElem& val)
1387{
1388    vecRegfileWrites++;
1389    regFile.setVecElem(phys_reg, val);
1390}
1391
1392template <class Impl>
1393void
1394FullO3CPU<Impl>::setVecPredReg(PhysRegIdPtr phys_reg,
1395                               const VecPredRegContainer& val)
1396{
1397    vecPredRegfileWrites++;
1398    regFile.setVecPredReg(phys_reg, val);
1399}
1400
1401template <class Impl>
1402void
1403FullO3CPU<Impl>::setCCReg(PhysRegIdPtr phys_reg, RegVal val)
1404{
1405    ccRegfileWrites++;
1406    regFile.setCCReg(phys_reg, val);
1407}
1408
1409template <class Impl>
1410RegVal
1411FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid)
1412{
1413    intRegfileReads++;
1414    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1415            RegId(IntRegClass, reg_idx));
1416
1417    return regFile.readIntReg(phys_reg);
1418}
1419
1420template <class Impl>
1421RegVal
1422FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid)
1423{
1424    fpRegfileReads++;
1425    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1426        RegId(FloatRegClass, reg_idx));
1427
1428    return regFile.readFloatReg(phys_reg);
1429}
1430
1431template <class Impl>
1432auto
1433FullO3CPU<Impl>::readArchVecReg(int reg_idx, ThreadID tid) const
1434        -> const VecRegContainer&
1435{
1436    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1437                RegId(VecRegClass, reg_idx));
1438    return readVecReg(phys_reg);
1439}
1440
1441template <class Impl>
1442auto
1443FullO3CPU<Impl>::getWritableArchVecReg(int reg_idx, ThreadID tid)
1444        -> VecRegContainer&
1445{
1446    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1447                RegId(VecRegClass, reg_idx));
1448    return getWritableVecReg(phys_reg);
1449}
1450
1451template <class Impl>
1452auto
1453FullO3CPU<Impl>::readArchVecElem(const RegIndex& reg_idx, const ElemIndex& ldx,
1454                                 ThreadID tid) const -> const VecElem&
1455{
1456    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1457                                RegId(VecElemClass, reg_idx, ldx));
1458    return readVecElem(phys_reg);
1459}
1460
1461template <class Impl>
1462auto
1463FullO3CPU<Impl>::readArchVecPredReg(int reg_idx, ThreadID tid) const
1464        -> const VecPredRegContainer&
1465{
1466    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1467                RegId(VecPredRegClass, reg_idx));
1468    return readVecPredReg(phys_reg);
1469}
1470
1471template <class Impl>
1472auto
1473FullO3CPU<Impl>::getWritableArchVecPredReg(int reg_idx, ThreadID tid)
1474        -> VecPredRegContainer&
1475{
1476    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1477                RegId(VecPredRegClass, reg_idx));
1478    return getWritableVecPredReg(phys_reg);
1479}
1480
1481template <class Impl>
1482RegVal
1483FullO3CPU<Impl>::readArchCCReg(int reg_idx, ThreadID tid)
1484{
1485    ccRegfileReads++;
1486    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1487        RegId(CCRegClass, reg_idx));
1488
1489    return regFile.readCCReg(phys_reg);
1490}
1491
1492template <class Impl>
1493void
1494FullO3CPU<Impl>::setArchIntReg(int reg_idx, RegVal val, ThreadID tid)
1495{
1496    intRegfileWrites++;
1497    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1498            RegId(IntRegClass, reg_idx));
1499
1500    regFile.setIntReg(phys_reg, val);
1501}
1502
1503template <class Impl>
1504void
1505FullO3CPU<Impl>::setArchFloatReg(int reg_idx, RegVal val, ThreadID tid)
1506{
1507    fpRegfileWrites++;
1508    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1509            RegId(FloatRegClass, reg_idx));
1510
1511    regFile.setFloatReg(phys_reg, val);
1512}
1513
1514template <class Impl>
1515void
1516FullO3CPU<Impl>::setArchVecReg(int reg_idx, const VecRegContainer& val,
1517                               ThreadID tid)
1518{
1519    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1520                RegId(VecRegClass, reg_idx));
1521    setVecReg(phys_reg, val);
1522}
1523
1524template <class Impl>
1525void
1526FullO3CPU<Impl>::setArchVecElem(const RegIndex& reg_idx, const ElemIndex& ldx,
1527                                const VecElem& val, ThreadID tid)
1528{
1529    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1530                RegId(VecElemClass, reg_idx, ldx));
1531    setVecElem(phys_reg, val);
1532}
1533
1534template <class Impl>
1535void
1536FullO3CPU<Impl>::setArchVecPredReg(int reg_idx, const VecPredRegContainer& val,
1537                                   ThreadID tid)
1538{
1539    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1540                RegId(VecPredRegClass, reg_idx));
1541    setVecPredReg(phys_reg, val);
1542}
1543
1544template <class Impl>
1545void
1546FullO3CPU<Impl>::setArchCCReg(int reg_idx, RegVal val, ThreadID tid)
1547{
1548    ccRegfileWrites++;
1549    PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
1550            RegId(CCRegClass, reg_idx));
1551
1552    regFile.setCCReg(phys_reg, val);
1553}
1554
1555template <class Impl>
1556TheISA::PCState
1557FullO3CPU<Impl>::pcState(ThreadID tid)
1558{
1559    return commit.pcState(tid);
1560}
1561
1562template <class Impl>
1563void
1564FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid)
1565{
1566    commit.pcState(val, tid);
1567}
1568
1569template <class Impl>
1570Addr
1571FullO3CPU<Impl>::instAddr(ThreadID tid)
1572{
1573    return commit.instAddr(tid);
1574}
1575
1576template <class Impl>
1577Addr
1578FullO3CPU<Impl>::nextInstAddr(ThreadID tid)
1579{
1580    return commit.nextInstAddr(tid);
1581}
1582
1583template <class Impl>
1584MicroPC
1585FullO3CPU<Impl>::microPC(ThreadID tid)
1586{
1587    return commit.microPC(tid);
1588}
1589
1590template <class Impl>
1591void
1592FullO3CPU<Impl>::squashFromTC(ThreadID tid)
1593{
1594    this->thread[tid]->noSquashFromTC = true;
1595    this->commit.generateTCEvent(tid);
1596}
1597
1598template <class Impl>
1599typename FullO3CPU<Impl>::ListIt
1600FullO3CPU<Impl>::addInst(const DynInstPtr &inst)
1601{
1602    instList.push_back(inst);
1603
1604    return --(instList.end());
1605}
1606
1607template <class Impl>
1608void
1609FullO3CPU<Impl>::instDone(ThreadID tid, const DynInstPtr &inst)
1610{
1611    // Keep an instruction count.
1612    if (!inst->isMicroop() || inst->isLastMicroop()) {
1613        thread[tid]->numInst++;
1614        thread[tid]->numInsts++;
1615        committedInsts[tid]++;
1616        system->totalNumInsts++;
1617
1618        // Check for instruction-count-based events.
1619        comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1620        system->instEventQueue.serviceEvents(system->totalNumInsts);
1621    }
1622    thread[tid]->numOp++;
1623    thread[tid]->numOps++;
1624    committedOps[tid]++;
1625
1626    probeInstCommit(inst->staticInst);
1627}
1628
1629template <class Impl>
1630void
1631FullO3CPU<Impl>::removeFrontInst(const DynInstPtr &inst)
1632{
1633    DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s "
1634            "[sn:%lli]\n",
1635            inst->threadNumber, inst->pcState(), inst->seqNum);
1636
1637    removeInstsThisCycle = true;
1638
1639    // Remove the front instruction.
1640    removeList.push(inst->getInstListIt());
1641}
1642
1643template <class Impl>
1644void
1645FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid)
1646{
1647    DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1648            " list.\n", tid);
1649
1650    ListIt end_it;
1651
1652    bool rob_empty = false;
1653
1654    if (instList.empty()) {
1655        return;
1656    } else if (rob.isEmpty(tid)) {
1657        DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1658        end_it = instList.begin();
1659        rob_empty = true;
1660    } else {
1661        end_it = (rob.readTailInst(tid))->getInstListIt();
1662        DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1663    }
1664
1665    removeInstsThisCycle = true;
1666
1667    ListIt inst_it = instList.end();
1668
1669    inst_it--;
1670
1671    // Walk through the instruction list, removing any instructions
1672    // that were inserted after the given instruction iterator, end_it.
1673    while (inst_it != end_it) {
1674        assert(!instList.empty());
1675
1676        squashInstIt(inst_it, tid);
1677
1678        inst_it--;
1679    }
1680
1681    // If the ROB was empty, then we actually need to remove the first
1682    // instruction as well.
1683    if (rob_empty) {
1684        squashInstIt(inst_it, tid);
1685    }
1686}
1687
1688template <class Impl>
1689void
1690FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid)
1691{
1692    assert(!instList.empty());
1693
1694    removeInstsThisCycle = true;
1695
1696    ListIt inst_iter = instList.end();
1697
1698    inst_iter--;
1699
1700    DPRINTF(O3CPU, "Deleting instructions from instruction "
1701            "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1702            tid, seq_num, (*inst_iter)->seqNum);
1703
1704    while ((*inst_iter)->seqNum > seq_num) {
1705
1706        bool break_loop = (inst_iter == instList.begin());
1707
1708        squashInstIt(inst_iter, tid);
1709
1710        inst_iter--;
1711
1712        if (break_loop)
1713            break;
1714    }
1715}
1716
1717template <class Impl>
1718inline void
1719FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid)
1720{
1721    if ((*instIt)->threadNumber == tid) {
1722        DPRINTF(O3CPU, "Squashing instruction, "
1723                "[tid:%i] [sn:%lli] PC %s\n",
1724                (*instIt)->threadNumber,
1725                (*instIt)->seqNum,
1726                (*instIt)->pcState());
1727
1728        // Mark it as squashed.
1729        (*instIt)->setSquashed();
1730
1731        // @todo: Formulate a consistent method for deleting
1732        // instructions from the instruction list
1733        // Remove the instruction from the list.
1734        removeList.push(instIt);
1735    }
1736}
1737
1738template <class Impl>
1739void
1740FullO3CPU<Impl>::cleanUpRemovedInsts()
1741{
1742    while (!removeList.empty()) {
1743        DPRINTF(O3CPU, "Removing instruction, "
1744                "[tid:%i] [sn:%lli] PC %s\n",
1745                (*removeList.front())->threadNumber,
1746                (*removeList.front())->seqNum,
1747                (*removeList.front())->pcState());
1748
1749        instList.erase(removeList.front());
1750
1751        removeList.pop();
1752    }
1753
1754    removeInstsThisCycle = false;
1755}
1756/*
1757template <class Impl>
1758void
1759FullO3CPU<Impl>::removeAllInsts()
1760{
1761    instList.clear();
1762}
1763*/
1764template <class Impl>
1765void
1766FullO3CPU<Impl>::dumpInsts()
1767{
1768    int num = 0;
1769
1770    ListIt inst_list_it = instList.begin();
1771
1772    cprintf("Dumping Instruction List\n");
1773
1774    while (inst_list_it != instList.end()) {
1775        cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1776                "Squashed:%i\n\n",
1777                num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber,
1778                (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1779                (*inst_list_it)->isSquashed());
1780        inst_list_it++;
1781        ++num;
1782    }
1783}
1784/*
1785template <class Impl>
1786void
1787FullO3CPU<Impl>::wakeDependents(const DynInstPtr &inst)
1788{
1789    iew.wakeDependents(inst);
1790}
1791*/
1792template <class Impl>
1793void
1794FullO3CPU<Impl>::wakeCPU()
1795{
1796    if (activityRec.active() || tickEvent.scheduled()) {
1797        DPRINTF(Activity, "CPU already running.\n");
1798        return;
1799    }
1800
1801    DPRINTF(Activity, "Waking up CPU\n");
1802
1803    Cycles cycles(curCycle() - lastRunningCycle);
1804    // @todo: This is an oddity that is only here to match the stats
1805    if (cycles > 1) {
1806        --cycles;
1807        idleCycles += cycles;
1808        numCycles += cycles;
1809    }
1810
1811    schedule(tickEvent, clockEdge());
1812}
1813
1814template <class Impl>
1815void
1816FullO3CPU<Impl>::wakeup(ThreadID tid)
1817{
1818    if (this->thread[tid]->status() != ThreadContext::Suspended)
1819        return;
1820
1821    this->wakeCPU();
1822
1823    DPRINTF(Quiesce, "Suspended Processor woken\n");
1824    this->threadContexts[tid]->activate();
1825}
1826
1827template <class Impl>
1828ThreadID
1829FullO3CPU<Impl>::getFreeTid()
1830{
1831    for (ThreadID tid = 0; tid < numThreads; tid++) {
1832        if (!tids[tid]) {
1833            tids[tid] = true;
1834            return tid;
1835        }
1836    }
1837
1838    return InvalidThreadID;
1839}
1840
1841template <class Impl>
1842void
1843FullO3CPU<Impl>::updateThreadPriority()
1844{
1845    if (activeThreads.size() > 1) {
1846        //DEFAULT TO ROUND ROBIN SCHEME
1847        //e.g. Move highest priority to end of thread list
1848        list<ThreadID>::iterator list_begin = activeThreads.begin();
1849
1850        unsigned high_thread = *list_begin;
1851
1852        activeThreads.erase(list_begin);
1853
1854        activeThreads.push_back(high_thread);
1855    }
1856}
1857
1858template <class Impl>
1859void
1860FullO3CPU<Impl>::addThreadToExitingList(ThreadID tid)
1861{
1862    DPRINTF(O3CPU, "Thread %d is inserted to exitingThreads list\n", tid);
1863
1864    // the thread trying to exit can't be already halted
1865    assert(tcBase(tid)->status() != ThreadContext::Halted);
1866
1867    // make sure the thread has not been added to the list yet
1868    assert(exitingThreads.count(tid) == 0);
1869
1870    // add the thread to exitingThreads list to mark that this thread is
1871    // trying to exit. The boolean value in the pair denotes if a thread is
1872    // ready to exit. The thread is not ready to exit until the corresponding
1873    // exit trap event is processed in the future. Until then, it'll be still
1874    // an active thread that is trying to exit.
1875    exitingThreads.emplace(std::make_pair(tid, false));
1876}
1877
1878template <class Impl>
1879bool
1880FullO3CPU<Impl>::isThreadExiting(ThreadID tid) const
1881{
1882    return exitingThreads.count(tid) == 1;
1883}
1884
1885template <class Impl>
1886void
1887FullO3CPU<Impl>::scheduleThreadExitEvent(ThreadID tid)
1888{
1889    assert(exitingThreads.count(tid) == 1);
1890
1891    // exit trap event has been processed. Now, the thread is ready to exit
1892    // and be removed from the CPU.
1893    exitingThreads[tid] = true;
1894
1895    // we schedule a threadExitEvent in the next cycle to properly clean
1896    // up the thread's states in the pipeline. threadExitEvent has lower
1897    // priority than tickEvent, so the cleanup will happen at the very end
1898    // of the next cycle after all pipeline stages complete their operations.
1899    // We want all stages to complete squashing instructions before doing
1900    // the cleanup.
1901    if (!threadExitEvent.scheduled()) {
1902        schedule(threadExitEvent, nextCycle());
1903    }
1904}
1905
1906template <class Impl>
1907void
1908FullO3CPU<Impl>::exitThreads()
1909{
1910    // there must be at least one thread trying to exit
1911    assert(exitingThreads.size() > 0);
1912
1913    // terminate all threads that are ready to exit
1914    auto it = exitingThreads.begin();
1915    while (it != exitingThreads.end()) {
1916        ThreadID thread_id = it->first;
1917        bool readyToExit = it->second;
1918
1919        if (readyToExit) {
1920            DPRINTF(O3CPU, "Exiting thread %d\n", thread_id);
1921            haltContext(thread_id);
1922            tcBase(thread_id)->setStatus(ThreadContext::Halted);
1923            it = exitingThreads.erase(it);
1924        } else {
1925            it++;
1926        }
1927    }
1928}
1929
1930// Forward declaration of FullO3CPU.
1931template class FullO3CPU<O3CPUImpl>;
1932