cpu.cc revision 11423:831c7f2f9e39 
1/*
2 * Copyright (c) 2011-2012, 2014 ARM Limited
3 * Copyright (c) 2013 Advanced Micro Devices, Inc.
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder.  You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2004-2006 The Regents of The University of Michigan
16 * Copyright (c) 2011 Regents of the University of California
17 * All rights reserved.
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions are
21 * met: redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer;
23 * redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution;
26 * neither the name of the copyright holders nor the names of its
27 * contributors may be used to endorse or promote products derived from
28 * this software without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 *
42 * Authors: Kevin Lim
43 *          Korey Sewell
44 *          Rick Strong
45 */
46
47#include "arch/kernel_stats.hh"
48#include "config/the_isa.hh"
49#include "cpu/checker/cpu.hh"
50#include "cpu/checker/thread_context.hh"
51#include "cpu/o3/cpu.hh"
52#include "cpu/o3/isa_specific.hh"
53#include "cpu/o3/thread_context.hh"
54#include "cpu/activity.hh"
55#include "cpu/quiesce_event.hh"
56#include "cpu/simple_thread.hh"
57#include "cpu/thread_context.hh"
58#include "debug/Activity.hh"
59#include "debug/Drain.hh"
60#include "debug/O3CPU.hh"
61#include "debug/Quiesce.hh"
62#include "enums/MemoryMode.hh"
63#include "sim/core.hh"
64#include "sim/full_system.hh"
65#include "sim/process.hh"
66#include "sim/stat_control.hh"
67#include "sim/system.hh"
68
69#if THE_ISA == ALPHA_ISA
70#include "arch/alpha/osfpal.hh"
71#include "debug/Activity.hh"
72#endif
73
74struct BaseCPUParams;
75
76using namespace TheISA;
77using namespace std;
78
79BaseO3CPU::BaseO3CPU(BaseCPUParams *params)
80    : BaseCPU(params)
81{
82}
83
84void
85BaseO3CPU::regStats()
86{
87    BaseCPU::regStats();
88}
89
90template<class Impl>
91bool
92FullO3CPU<Impl>::IcachePort::recvTimingResp(PacketPtr pkt)
93{
94    DPRINTF(O3CPU, "Fetch unit received timing\n");
95    // We shouldn't ever get a cacheable block in Modified state
96    assert(pkt->req->isUncacheable() ||
97           !(pkt->cacheResponding() && !pkt->hasSharers()));
98    fetch->processCacheCompletion(pkt);
99
100    return true;
101}
102
103template<class Impl>
104void
105FullO3CPU<Impl>::IcachePort::recvReqRetry()
106{
107    fetch->recvReqRetry();
108}
109
110template <class Impl>
111bool
112FullO3CPU<Impl>::DcachePort::recvTimingResp(PacketPtr pkt)
113{
114    return lsq->recvTimingResp(pkt);
115}
116
117template <class Impl>
118void
119FullO3CPU<Impl>::DcachePort::recvTimingSnoopReq(PacketPtr pkt)
120{
121    for (ThreadID tid = 0; tid < cpu->numThreads; tid++) {
122        if (cpu->getCpuAddrMonitor(tid)->doMonitor(pkt)) {
123            cpu->wakeup(tid);
124        }
125    }
126    lsq->recvTimingSnoopReq(pkt);
127}
128
129template <class Impl>
130void
131FullO3CPU<Impl>::DcachePort::recvReqRetry()
132{
133    lsq->recvReqRetry();
134}
135
136template <class Impl>
137FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c)
138    : Event(CPU_Tick_Pri), cpu(c)
139{
140}
141
142template <class Impl>
143void
144FullO3CPU<Impl>::TickEvent::process()
145{
146    cpu->tick();
147}
148
149template <class Impl>
150const char *
151FullO3CPU<Impl>::TickEvent::description() const
152{
153    return "FullO3CPU tick";
154}
155
156template <class Impl>
157FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
158    : BaseO3CPU(params),
159      itb(params->itb),
160      dtb(params->dtb),
161      tickEvent(this),
162#ifndef NDEBUG
163      instcount(0),
164#endif
165      removeInstsThisCycle(false),
166      fetch(this, params),
167      decode(this, params),
168      rename(this, params),
169      iew(this, params),
170      commit(this, params),
171
172      regFile(params->numPhysIntRegs,
173              params->numPhysFloatRegs,
174              params->numPhysCCRegs),
175
176      freeList(name() + ".freelist", &regFile),
177
178      rob(this, params),
179
180      scoreboard(name() + ".scoreboard",
181                 regFile.totalNumPhysRegs(), TheISA::NumMiscRegs,
182                 TheISA::ZeroReg, TheISA::ZeroReg),
183
184      isa(numThreads, NULL),
185
186      icachePort(&fetch, this),
187      dcachePort(&iew.ldstQueue, this),
188
189      timeBuffer(params->backComSize, params->forwardComSize),
190      fetchQueue(params->backComSize, params->forwardComSize),
191      decodeQueue(params->backComSize, params->forwardComSize),
192      renameQueue(params->backComSize, params->forwardComSize),
193      iewQueue(params->backComSize, params->forwardComSize),
194      activityRec(name(), NumStages,
195                  params->backComSize + params->forwardComSize,
196                  params->activity),
197
198      globalSeqNum(1),
199      system(params->system),
200      lastRunningCycle(curCycle())
201{
202    if (!params->switched_out) {
203        _status = Running;
204    } else {
205        _status = SwitchedOut;
206    }
207
208    if (params->checker) {
209        BaseCPU *temp_checker = params->checker;
210        checker = dynamic_cast<Checker<Impl> *>(temp_checker);
211        checker->setIcachePort(&icachePort);
212        checker->setSystem(params->system);
213    } else {
214        checker = NULL;
215    }
216
217    if (!FullSystem) {
218        thread.resize(numThreads);
219        tids.resize(numThreads);
220    }
221
222    // The stages also need their CPU pointer setup.  However this
223    // must be done at the upper level CPU because they have pointers
224    // to the upper level CPU, and not this FullO3CPU.
225
226    // Set up Pointers to the activeThreads list for each stage
227    fetch.setActiveThreads(&activeThreads);
228    decode.setActiveThreads(&activeThreads);
229    rename.setActiveThreads(&activeThreads);
230    iew.setActiveThreads(&activeThreads);
231    commit.setActiveThreads(&activeThreads);
232
233    // Give each of the stages the time buffer they will use.
234    fetch.setTimeBuffer(&timeBuffer);
235    decode.setTimeBuffer(&timeBuffer);
236    rename.setTimeBuffer(&timeBuffer);
237    iew.setTimeBuffer(&timeBuffer);
238    commit.setTimeBuffer(&timeBuffer);
239
240    // Also setup each of the stages' queues.
241    fetch.setFetchQueue(&fetchQueue);
242    decode.setFetchQueue(&fetchQueue);
243    commit.setFetchQueue(&fetchQueue);
244    decode.setDecodeQueue(&decodeQueue);
245    rename.setDecodeQueue(&decodeQueue);
246    rename.setRenameQueue(&renameQueue);
247    iew.setRenameQueue(&renameQueue);
248    iew.setIEWQueue(&iewQueue);
249    commit.setIEWQueue(&iewQueue);
250    commit.setRenameQueue(&renameQueue);
251
252    commit.setIEWStage(&iew);
253    rename.setIEWStage(&iew);
254    rename.setCommitStage(&commit);
255
256    ThreadID active_threads;
257    if (FullSystem) {
258        active_threads = 1;
259    } else {
260        active_threads = params->workload.size();
261
262        if (active_threads > Impl::MaxThreads) {
263            panic("Workload Size too large. Increase the 'MaxThreads' "
264                  "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) "
265                  "or edit your workload size.");
266        }
267    }
268
269    //Make Sure That this a Valid Architeture
270    assert(params->numPhysIntRegs   >= numThreads * TheISA::NumIntRegs);
271    assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
272    assert(params->numPhysCCRegs >= numThreads * TheISA::NumCCRegs);
273
274    rename.setScoreboard(&scoreboard);
275    iew.setScoreboard(&scoreboard);
276
277    // Setup the rename map for whichever stages need it.
278    for (ThreadID tid = 0; tid < numThreads; tid++) {
279        isa[tid] = params->isa[tid];
280
281        // Only Alpha has an FP zero register, so for other ISAs we
282        // use an invalid FP register index to avoid special treatment
283        // of any valid FP reg.
284        RegIndex invalidFPReg = TheISA::NumFloatRegs + 1;
285        RegIndex fpZeroReg =
286            (THE_ISA == ALPHA_ISA) ? TheISA::ZeroReg : invalidFPReg;
287
288        commitRenameMap[tid].init(&regFile, TheISA::ZeroReg, fpZeroReg,
289                                  &freeList);
290
291        renameMap[tid].init(&regFile, TheISA::ZeroReg, fpZeroReg,
292                            &freeList);
293    }
294
295    // Initialize rename map to assign physical registers to the
296    // architectural registers for active threads only.
297    for (ThreadID tid = 0; tid < active_threads; tid++) {
298        for (RegIndex ridx = 0; ridx < TheISA::NumIntRegs; ++ridx) {
299            // Note that we can't use the rename() method because we don't
300            // want special treatment for the zero register at this point
301            PhysRegIndex phys_reg = freeList.getIntReg();
302            renameMap[tid].setIntEntry(ridx, phys_reg);
303            commitRenameMap[tid].setIntEntry(ridx, phys_reg);
304        }
305
306        for (RegIndex ridx = 0; ridx < TheISA::NumFloatRegs; ++ridx) {
307            PhysRegIndex phys_reg = freeList.getFloatReg();
308            renameMap[tid].setFloatEntry(ridx, phys_reg);
309            commitRenameMap[tid].setFloatEntry(ridx, phys_reg);
310        }
311
312        for (RegIndex ridx = 0; ridx < TheISA::NumCCRegs; ++ridx) {
313            PhysRegIndex phys_reg = freeList.getCCReg();
314            renameMap[tid].setCCEntry(ridx, phys_reg);
315            commitRenameMap[tid].setCCEntry(ridx, phys_reg);
316        }
317    }
318
319    rename.setRenameMap(renameMap);
320    commit.setRenameMap(commitRenameMap);
321    rename.setFreeList(&freeList);
322
323    // Setup the ROB for whichever stages need it.
324    commit.setROB(&rob);
325
326    lastActivatedCycle = 0;
327#if 0
328    // Give renameMap & rename stage access to the freeList;
329    for (ThreadID tid = 0; tid < numThreads; tid++)
330        globalSeqNum[tid] = 1;
331#endif
332
333    DPRINTF(O3CPU, "Creating O3CPU object.\n");
334
335    // Setup any thread state.
336    this->thread.resize(this->numThreads);
337
338    for (ThreadID tid = 0; tid < this->numThreads; ++tid) {
339        if (FullSystem) {
340            // SMT is not supported in FS mode yet.
341            assert(this->numThreads == 1);
342            this->thread[tid] = new Thread(this, 0, NULL);
343        } else {
344            if (tid < params->workload.size()) {
345                DPRINTF(O3CPU, "Workload[%i] process is %#x",
346                        tid, this->thread[tid]);
347                this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
348                        (typename Impl::O3CPU *)(this),
349                        tid, params->workload[tid]);
350
351                //usedTids[tid] = true;
352                //threadMap[tid] = tid;
353            } else {
354                //Allocate Empty thread so M5 can use later
355                //when scheduling threads to CPU
356                Process* dummy_proc = NULL;
357
358                this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
359                        (typename Impl::O3CPU *)(this),
360                        tid, dummy_proc);
361                //usedTids[tid] = false;
362            }
363        }
364
365        ThreadContext *tc;
366
367        // Setup the TC that will serve as the interface to the threads/CPU.
368        O3ThreadContext<Impl> *o3_tc = new O3ThreadContext<Impl>;
369
370        tc = o3_tc;
371
372        // If we're using a checker, then the TC should be the
373        // CheckerThreadContext.
374        if (params->checker) {
375            tc = new CheckerThreadContext<O3ThreadContext<Impl> >(
376                o3_tc, this->checker);
377        }
378
379        o3_tc->cpu = (typename Impl::O3CPU *)(this);
380        assert(o3_tc->cpu);
381        o3_tc->thread = this->thread[tid];
382
383        if (FullSystem) {
384            // Setup quiesce event.
385            this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
386        }
387        // Give the thread the TC.
388        this->thread[tid]->tc = tc;
389
390        // Add the TC to the CPU's list of TC's.
391        this->threadContexts.push_back(tc);
392    }
393
394    // FullO3CPU always requires an interrupt controller.
395    if (!params->switched_out && interrupts.empty()) {
396        fatal("FullO3CPU %s has no interrupt controller.\n"
397              "Ensure createInterruptController() is called.\n", name());
398    }
399
400    for (ThreadID tid = 0; tid < this->numThreads; tid++)
401        this->thread[tid]->setFuncExeInst(0);
402}
403
404template <class Impl>
405FullO3CPU<Impl>::~FullO3CPU()
406{
407}
408
409template <class Impl>
410void
411FullO3CPU<Impl>::regProbePoints()
412{
413    BaseCPU::regProbePoints();
414
415    ppInstAccessComplete = new ProbePointArg<PacketPtr>(getProbeManager(), "InstAccessComplete");
416    ppDataAccessComplete = new ProbePointArg<std::pair<DynInstPtr, PacketPtr> >(getProbeManager(), "DataAccessComplete");
417
418    fetch.regProbePoints();
419    rename.regProbePoints();
420    iew.regProbePoints();
421    commit.regProbePoints();
422}
423
424template <class Impl>
425void
426FullO3CPU<Impl>::regStats()
427{
428    BaseO3CPU::regStats();
429
430    // Register any of the O3CPU's stats here.
431    timesIdled
432        .name(name() + ".timesIdled")
433        .desc("Number of times that the entire CPU went into an idle state and"
434              " unscheduled itself")
435        .prereq(timesIdled);
436
437    idleCycles
438        .name(name() + ".idleCycles")
439        .desc("Total number of cycles that the CPU has spent unscheduled due "
440              "to idling")
441        .prereq(idleCycles);
442
443    quiesceCycles
444        .name(name() + ".quiesceCycles")
445        .desc("Total number of cycles that CPU has spent quiesced or waiting "
446              "for an interrupt")
447        .prereq(quiesceCycles);
448
449    // Number of Instructions simulated
450    // --------------------------------
451    // Should probably be in Base CPU but need templated
452    // MaxThreads so put in here instead
453    committedInsts
454        .init(numThreads)
455        .name(name() + ".committedInsts")
456        .desc("Number of Instructions Simulated")
457        .flags(Stats::total);
458
459    committedOps
460        .init(numThreads)
461        .name(name() + ".committedOps")
462        .desc("Number of Ops (including micro ops) Simulated")
463        .flags(Stats::total);
464
465    cpi
466        .name(name() + ".cpi")
467        .desc("CPI: Cycles Per Instruction")
468        .precision(6);
469    cpi = numCycles / committedInsts;
470
471    totalCpi
472        .name(name() + ".cpi_total")
473        .desc("CPI: Total CPI of All Threads")
474        .precision(6);
475    totalCpi = numCycles / sum(committedInsts);
476
477    ipc
478        .name(name() + ".ipc")
479        .desc("IPC: Instructions Per Cycle")
480        .precision(6);
481    ipc =  committedInsts / numCycles;
482
483    totalIpc
484        .name(name() + ".ipc_total")
485        .desc("IPC: Total IPC of All Threads")
486        .precision(6);
487    totalIpc =  sum(committedInsts) / numCycles;
488
489    this->fetch.regStats();
490    this->decode.regStats();
491    this->rename.regStats();
492    this->iew.regStats();
493    this->commit.regStats();
494    this->rob.regStats();
495
496    intRegfileReads
497        .name(name() + ".int_regfile_reads")
498        .desc("number of integer regfile reads")
499        .prereq(intRegfileReads);
500
501    intRegfileWrites
502        .name(name() + ".int_regfile_writes")
503        .desc("number of integer regfile writes")
504        .prereq(intRegfileWrites);
505
506    fpRegfileReads
507        .name(name() + ".fp_regfile_reads")
508        .desc("number of floating regfile reads")
509        .prereq(fpRegfileReads);
510
511    fpRegfileWrites
512        .name(name() + ".fp_regfile_writes")
513        .desc("number of floating regfile writes")
514        .prereq(fpRegfileWrites);
515
516    ccRegfileReads
517        .name(name() + ".cc_regfile_reads")
518        .desc("number of cc regfile reads")
519        .prereq(ccRegfileReads);
520
521    ccRegfileWrites
522        .name(name() + ".cc_regfile_writes")
523        .desc("number of cc regfile writes")
524        .prereq(ccRegfileWrites);
525
526    miscRegfileReads
527        .name(name() + ".misc_regfile_reads")
528        .desc("number of misc regfile reads")
529        .prereq(miscRegfileReads);
530
531    miscRegfileWrites
532        .name(name() + ".misc_regfile_writes")
533        .desc("number of misc regfile writes")
534        .prereq(miscRegfileWrites);
535}
536
537template <class Impl>
538void
539FullO3CPU<Impl>::tick()
540{
541    DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
542    assert(!switchedOut());
543    assert(drainState() != DrainState::Drained);
544
545    ++numCycles;
546    ppCycles->notify(1);
547
548//    activity = false;
549
550    //Tick each of the stages
551    fetch.tick();
552
553    decode.tick();
554
555    rename.tick();
556
557    iew.tick();
558
559    commit.tick();
560
561    // Now advance the time buffers
562    timeBuffer.advance();
563
564    fetchQueue.advance();
565    decodeQueue.advance();
566    renameQueue.advance();
567    iewQueue.advance();
568
569    activityRec.advance();
570
571    if (removeInstsThisCycle) {
572        cleanUpRemovedInsts();
573    }
574
575    if (!tickEvent.scheduled()) {
576        if (_status == SwitchedOut) {
577            DPRINTF(O3CPU, "Switched out!\n");
578            // increment stat
579            lastRunningCycle = curCycle();
580        } else if (!activityRec.active() || _status == Idle) {
581            DPRINTF(O3CPU, "Idle!\n");
582            lastRunningCycle = curCycle();
583            timesIdled++;
584        } else {
585            schedule(tickEvent, clockEdge(Cycles(1)));
586            DPRINTF(O3CPU, "Scheduling next tick!\n");
587        }
588    }
589
590    if (!FullSystem)
591        updateThreadPriority();
592
593    tryDrain();
594}
595
596template <class Impl>
597void
598FullO3CPU<Impl>::init()
599{
600    BaseCPU::init();
601
602    for (ThreadID tid = 0; tid < numThreads; ++tid) {
603        // Set noSquashFromTC so that the CPU doesn't squash when initially
604        // setting up registers.
605        thread[tid]->noSquashFromTC = true;
606        // Initialise the ThreadContext's memory proxies
607        thread[tid]->initMemProxies(thread[tid]->getTC());
608    }
609
610    if (FullSystem && !params()->switched_out) {
611        for (ThreadID tid = 0; tid < numThreads; tid++) {
612            ThreadContext *src_tc = threadContexts[tid];
613            TheISA::initCPU(src_tc, src_tc->contextId());
614        }
615    }
616
617    // Clear noSquashFromTC.
618    for (int tid = 0; tid < numThreads; ++tid)
619        thread[tid]->noSquashFromTC = false;
620
621    commit.setThreads(thread);
622}
623
624template <class Impl>
625void
626FullO3CPU<Impl>::startup()
627{
628    BaseCPU::startup();
629    for (int tid = 0; tid < numThreads; ++tid)
630        isa[tid]->startup(threadContexts[tid]);
631
632    fetch.startupStage();
633    decode.startupStage();
634    iew.startupStage();
635    rename.startupStage();
636    commit.startupStage();
637}
638
639template <class Impl>
640void
641FullO3CPU<Impl>::activateThread(ThreadID tid)
642{
643    list<ThreadID>::iterator isActive =
644        std::find(activeThreads.begin(), activeThreads.end(), tid);
645
646    DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid);
647    assert(!switchedOut());
648
649    if (isActive == activeThreads.end()) {
650        DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
651                tid);
652
653        activeThreads.push_back(tid);
654    }
655}
656
657template <class Impl>
658void
659FullO3CPU<Impl>::deactivateThread(ThreadID tid)
660{
661    //Remove From Active List, if Active
662    list<ThreadID>::iterator thread_it =
663        std::find(activeThreads.begin(), activeThreads.end(), tid);
664
665    DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid);
666    assert(!switchedOut());
667
668    if (thread_it != activeThreads.end()) {
669        DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
670                tid);
671        activeThreads.erase(thread_it);
672    }
673
674    fetch.deactivateThread(tid);
675    commit.deactivateThread(tid);
676}
677
678template <class Impl>
679Counter
680FullO3CPU<Impl>::totalInsts() const
681{
682    Counter total(0);
683
684    ThreadID size = thread.size();
685    for (ThreadID i = 0; i < size; i++)
686        total += thread[i]->numInst;
687
688    return total;
689}
690
691template <class Impl>
692Counter
693FullO3CPU<Impl>::totalOps() const
694{
695    Counter total(0);
696
697    ThreadID size = thread.size();
698    for (ThreadID i = 0; i < size; i++)
699        total += thread[i]->numOp;
700
701    return total;
702}
703
704template <class Impl>
705void
706FullO3CPU<Impl>::activateContext(ThreadID tid)
707{
708    assert(!switchedOut());
709
710    // Needs to set each stage to running as well.
711    activateThread(tid);
712
713    // We don't want to wake the CPU if it is drained. In that case,
714    // we just want to flag the thread as active and schedule the tick
715    // event from drainResume() instead.
716    if (drainState() == DrainState::Drained)
717        return;
718
719    // If we are time 0 or if the last activation time is in the past,
720    // schedule the next tick and wake up the fetch unit
721    if (lastActivatedCycle == 0 || lastActivatedCycle < curTick()) {
722        scheduleTickEvent(Cycles(0));
723
724        // Be sure to signal that there's some activity so the CPU doesn't
725        // deschedule itself.
726        activityRec.activity();
727        fetch.wakeFromQuiesce();
728
729        Cycles cycles(curCycle() - lastRunningCycle);
730        // @todo: This is an oddity that is only here to match the stats
731        if (cycles != 0)
732            --cycles;
733        quiesceCycles += cycles;
734
735        lastActivatedCycle = curTick();
736
737        _status = Running;
738
739        BaseCPU::activateContext(tid);
740    }
741}
742
743template <class Impl>
744void
745FullO3CPU<Impl>::suspendContext(ThreadID tid)
746{
747    DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
748    assert(!switchedOut());
749
750    deactivateThread(tid);
751
752    // If this was the last thread then unschedule the tick event.
753    if (activeThreads.size() == 0) {
754        unscheduleTickEvent();
755        lastRunningCycle = curCycle();
756        _status = Idle;
757    }
758
759    DPRINTF(Quiesce, "Suspending Context\n");
760
761    BaseCPU::suspendContext(tid);
762}
763
764template <class Impl>
765void
766FullO3CPU<Impl>::haltContext(ThreadID tid)
767{
768    //For now, this is the same as deallocate
769    DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid);
770    assert(!switchedOut());
771
772    deactivateThread(tid);
773    removeThread(tid);
774}
775
776template <class Impl>
777void
778FullO3CPU<Impl>::insertThread(ThreadID tid)
779{
780    DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
781    // Will change now that the PC and thread state is internal to the CPU
782    // and not in the ThreadContext.
783    ThreadContext *src_tc;
784    if (FullSystem)
785        src_tc = system->threadContexts[tid];
786    else
787        src_tc = tcBase(tid);
788
789    //Bind Int Regs to Rename Map
790    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
791        PhysRegIndex phys_reg = freeList.getIntReg();
792
793        renameMap[tid].setEntry(ireg,phys_reg);
794        scoreboard.setReg(phys_reg);
795    }
796
797    //Bind Float Regs to Rename Map
798    int max_reg = TheISA::FP_Reg_Base + TheISA::NumFloatRegs;
799    for (int freg = TheISA::FP_Reg_Base; freg < max_reg; freg++) {
800        PhysRegIndex phys_reg = freeList.getFloatReg();
801
802        renameMap[tid].setEntry(freg,phys_reg);
803        scoreboard.setReg(phys_reg);
804    }
805
806    //Bind condition-code Regs to Rename Map
807    max_reg = TheISA::CC_Reg_Base + TheISA::NumCCRegs;
808    for (int creg = TheISA::CC_Reg_Base;
809         creg < max_reg; creg++) {
810        PhysRegIndex phys_reg = freeList.getCCReg();
811
812        renameMap[tid].setEntry(creg,phys_reg);
813        scoreboard.setReg(phys_reg);
814    }
815
816    //Copy Thread Data Into RegFile
817    //this->copyFromTC(tid);
818
819    //Set PC/NPC/NNPC
820    pcState(src_tc->pcState(), tid);
821
822    src_tc->setStatus(ThreadContext::Active);
823
824    activateContext(tid);
825
826    //Reset ROB/IQ/LSQ Entries
827    commit.rob->resetEntries();
828    iew.resetEntries();
829}
830
831template <class Impl>
832void
833FullO3CPU<Impl>::removeThread(ThreadID tid)
834{
835    DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
836
837    // Copy Thread Data From RegFile
838    // If thread is suspended, it might be re-allocated
839    // this->copyToTC(tid);
840
841
842    // @todo: 2-27-2008: Fix how we free up rename mappings
843    // here to alleviate the case for double-freeing registers
844    // in SMT workloads.
845
846    // Unbind Int Regs from Rename Map
847    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
848        PhysRegIndex phys_reg = renameMap[tid].lookup(ireg);
849        scoreboard.unsetReg(phys_reg);
850        freeList.addReg(phys_reg);
851    }
852
853    // Unbind Float Regs from Rename Map
854    int max_reg = TheISA::FP_Reg_Base + TheISA::NumFloatRegs;
855    for (int freg = TheISA::FP_Reg_Base; freg < max_reg; freg++) {
856        PhysRegIndex phys_reg = renameMap[tid].lookup(freg);
857        scoreboard.unsetReg(phys_reg);
858        freeList.addReg(phys_reg);
859    }
860
861    // Unbind condition-code Regs from Rename Map
862    max_reg = TheISA::CC_Reg_Base + TheISA::NumCCRegs;
863    for (int creg = TheISA::CC_Reg_Base; creg < max_reg; creg++) {
864        PhysRegIndex phys_reg = renameMap[tid].lookup(creg);
865        scoreboard.unsetReg(phys_reg);
866        freeList.addReg(phys_reg);
867    }
868
869    // Squash Throughout Pipeline
870    DynInstPtr inst = commit.rob->readHeadInst(tid);
871    InstSeqNum squash_seq_num = inst->seqNum;
872    fetch.squash(0, squash_seq_num, inst, tid);
873    decode.squash(tid);
874    rename.squash(squash_seq_num, tid);
875    iew.squash(tid);
876    iew.ldstQueue.squash(squash_seq_num, tid);
877    commit.rob->squash(squash_seq_num, tid);
878
879
880    assert(iew.instQueue.getCount(tid) == 0);
881    assert(iew.ldstQueue.getCount(tid) == 0);
882
883    // Reset ROB/IQ/LSQ Entries
884
885    // Commented out for now.  This should be possible to do by
886    // telling all the pipeline stages to drain first, and then
887    // checking until the drain completes.  Once the pipeline is
888    // drained, call resetEntries(). - 10-09-06 ktlim
889/*
890    if (activeThreads.size() >= 1) {
891        commit.rob->resetEntries();
892        iew.resetEntries();
893    }
894*/
895}
896
897template <class Impl>
898Fault
899FullO3CPU<Impl>::hwrei(ThreadID tid)
900{
901#if THE_ISA == ALPHA_ISA
902    // Need to clear the lock flag upon returning from an interrupt.
903    this->setMiscRegNoEffect(AlphaISA::MISCREG_LOCKFLAG, false, tid);
904
905    this->thread[tid]->kernelStats->hwrei();
906
907    // FIXME: XXX check for interrupts? XXX
908#endif
909    return NoFault;
910}
911
912template <class Impl>
913bool
914FullO3CPU<Impl>::simPalCheck(int palFunc, ThreadID tid)
915{
916#if THE_ISA == ALPHA_ISA
917    if (this->thread[tid]->kernelStats)
918        this->thread[tid]->kernelStats->callpal(palFunc,
919                                                this->threadContexts[tid]);
920
921    switch (palFunc) {
922      case PAL::halt:
923        halt();
924        if (--System::numSystemsRunning == 0)
925            exitSimLoop("all cpus halted");
926        break;
927
928      case PAL::bpt:
929      case PAL::bugchk:
930        if (this->system->breakpoint())
931            return false;
932        break;
933    }
934#endif
935    return true;
936}
937
938template <class Impl>
939Fault
940FullO3CPU<Impl>::getInterrupts()
941{
942    // Check if there are any outstanding interrupts
943    return this->interrupts[0]->getInterrupt(this->threadContexts[0]);
944}
945
946template <class Impl>
947void
948FullO3CPU<Impl>::processInterrupts(const Fault &interrupt)
949{
950    // Check for interrupts here.  For now can copy the code that
951    // exists within isa_fullsys_traits.hh.  Also assume that thread 0
952    // is the one that handles the interrupts.
953    // @todo: Possibly consolidate the interrupt checking code.
954    // @todo: Allow other threads to handle interrupts.
955
956    assert(interrupt != NoFault);
957    this->interrupts[0]->updateIntrInfo(this->threadContexts[0]);
958
959    DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name());
960    this->trap(interrupt, 0, nullptr);
961}
962
963template <class Impl>
964void
965FullO3CPU<Impl>::trap(const Fault &fault, ThreadID tid,
966                      const StaticInstPtr &inst)
967{
968    // Pass the thread's TC into the invoke method.
969    fault->invoke(this->threadContexts[tid], inst);
970}
971
972template <class Impl>
973void
974FullO3CPU<Impl>::syscall(int64_t callnum, ThreadID tid)
975{
976    DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid);
977
978    DPRINTF(Activity,"Activity: syscall() called.\n");
979
980    // Temporarily increase this by one to account for the syscall
981    // instruction.
982    ++(this->thread[tid]->funcExeInst);
983
984    // Execute the actual syscall.
985    this->thread[tid]->syscall(callnum);
986
987    // Decrease funcExeInst by one as the normal commit will handle
988    // incrementing it.
989    --(this->thread[tid]->funcExeInst);
990}
991
992template <class Impl>
993void
994FullO3CPU<Impl>::serializeThread(CheckpointOut &cp, ThreadID tid) const
995{
996    thread[tid]->serialize(cp);
997}
998
999template <class Impl>
1000void
1001FullO3CPU<Impl>::unserializeThread(CheckpointIn &cp, ThreadID tid)
1002{
1003    thread[tid]->unserialize(cp);
1004}
1005
1006template <class Impl>
1007DrainState
1008FullO3CPU<Impl>::drain()
1009{
1010    // If the CPU isn't doing anything, then return immediately.
1011    if (switchedOut())
1012        return DrainState::Drained;
1013
1014    DPRINTF(Drain, "Draining...\n");
1015
1016    // We only need to signal a drain to the commit stage as this
1017    // initiates squashing controls the draining. Once the commit
1018    // stage commits an instruction where it is safe to stop, it'll
1019    // squash the rest of the instructions in the pipeline and force
1020    // the fetch stage to stall. The pipeline will be drained once all
1021    // in-flight instructions have retired.
1022    commit.drain();
1023
1024    // Wake the CPU and record activity so everything can drain out if
1025    // the CPU was not able to immediately drain.
1026    if (!isDrained())  {
1027        wakeCPU();
1028        activityRec.activity();
1029
1030        DPRINTF(Drain, "CPU not drained\n");
1031
1032        return DrainState::Draining;
1033    } else {
1034        DPRINTF(Drain, "CPU is already drained\n");
1035        if (tickEvent.scheduled())
1036            deschedule(tickEvent);
1037
1038        // Flush out any old data from the time buffers.  In
1039        // particular, there might be some data in flight from the
1040        // fetch stage that isn't visible in any of the CPU buffers we
1041        // test in isDrained().
1042        for (int i = 0; i < timeBuffer.getSize(); ++i) {
1043            timeBuffer.advance();
1044            fetchQueue.advance();
1045            decodeQueue.advance();
1046            renameQueue.advance();
1047            iewQueue.advance();
1048        }
1049
1050        drainSanityCheck();
1051        return DrainState::Drained;
1052    }
1053}
1054
1055template <class Impl>
1056bool
1057FullO3CPU<Impl>::tryDrain()
1058{
1059    if (drainState() != DrainState::Draining || !isDrained())
1060        return false;
1061
1062    if (tickEvent.scheduled())
1063        deschedule(tickEvent);
1064
1065    DPRINTF(Drain, "CPU done draining, processing drain event\n");
1066    signalDrainDone();
1067
1068    return true;
1069}
1070
1071template <class Impl>
1072void
1073FullO3CPU<Impl>::drainSanityCheck() const
1074{
1075    assert(isDrained());
1076    fetch.drainSanityCheck();
1077    decode.drainSanityCheck();
1078    rename.drainSanityCheck();
1079    iew.drainSanityCheck();
1080    commit.drainSanityCheck();
1081}
1082
1083template <class Impl>
1084bool
1085FullO3CPU<Impl>::isDrained() const
1086{
1087    bool drained(true);
1088
1089    if (!instList.empty() || !removeList.empty()) {
1090        DPRINTF(Drain, "Main CPU structures not drained.\n");
1091        drained = false;
1092    }
1093
1094    if (!fetch.isDrained()) {
1095        DPRINTF(Drain, "Fetch not drained.\n");
1096        drained = false;
1097    }
1098
1099    if (!decode.isDrained()) {
1100        DPRINTF(Drain, "Decode not drained.\n");
1101        drained = false;
1102    }
1103
1104    if (!rename.isDrained()) {
1105        DPRINTF(Drain, "Rename not drained.\n");
1106        drained = false;
1107    }
1108
1109    if (!iew.isDrained()) {
1110        DPRINTF(Drain, "IEW not drained.\n");
1111        drained = false;
1112    }
1113
1114    if (!commit.isDrained()) {
1115        DPRINTF(Drain, "Commit not drained.\n");
1116        drained = false;
1117    }
1118
1119    return drained;
1120}
1121
1122template <class Impl>
1123void
1124FullO3CPU<Impl>::commitDrained(ThreadID tid)
1125{
1126    fetch.drainStall(tid);
1127}
1128
1129template <class Impl>
1130void
1131FullO3CPU<Impl>::drainResume()
1132{
1133    if (switchedOut())
1134        return;
1135
1136    DPRINTF(Drain, "Resuming...\n");
1137    verifyMemoryMode();
1138
1139    fetch.drainResume();
1140    commit.drainResume();
1141
1142    _status = Idle;
1143    for (ThreadID i = 0; i < thread.size(); i++) {
1144        if (thread[i]->status() == ThreadContext::Active) {
1145            DPRINTF(Drain, "Activating thread: %i\n", i);
1146            activateThread(i);
1147            _status = Running;
1148        }
1149    }
1150
1151    assert(!tickEvent.scheduled());
1152    if (_status == Running)
1153        schedule(tickEvent, nextCycle());
1154}
1155
1156template <class Impl>
1157void
1158FullO3CPU<Impl>::switchOut()
1159{
1160    DPRINTF(O3CPU, "Switching out\n");
1161    BaseCPU::switchOut();
1162
1163    activityRec.reset();
1164
1165    _status = SwitchedOut;
1166
1167    if (checker)
1168        checker->switchOut();
1169}
1170
1171template <class Impl>
1172void
1173FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
1174{
1175    BaseCPU::takeOverFrom(oldCPU);
1176
1177    fetch.takeOverFrom();
1178    decode.takeOverFrom();
1179    rename.takeOverFrom();
1180    iew.takeOverFrom();
1181    commit.takeOverFrom();
1182
1183    assert(!tickEvent.scheduled());
1184
1185    FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU);
1186    if (oldO3CPU)
1187        globalSeqNum = oldO3CPU->globalSeqNum;
1188
1189    lastRunningCycle = curCycle();
1190    _status = Idle;
1191}
1192
1193template <class Impl>
1194void
1195FullO3CPU<Impl>::verifyMemoryMode() const
1196{
1197    if (!system->isTimingMode()) {
1198        fatal("The O3 CPU requires the memory system to be in "
1199              "'timing' mode.\n");
1200    }
1201}
1202
1203template <class Impl>
1204TheISA::MiscReg
1205FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid) const
1206{
1207    return this->isa[tid]->readMiscRegNoEffect(misc_reg);
1208}
1209
1210template <class Impl>
1211TheISA::MiscReg
1212FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid)
1213{
1214    miscRegfileReads++;
1215    return this->isa[tid]->readMiscReg(misc_reg, tcBase(tid));
1216}
1217
1218template <class Impl>
1219void
1220FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg,
1221        const TheISA::MiscReg &val, ThreadID tid)
1222{
1223    this->isa[tid]->setMiscRegNoEffect(misc_reg, val);
1224}
1225
1226template <class Impl>
1227void
1228FullO3CPU<Impl>::setMiscReg(int misc_reg,
1229        const TheISA::MiscReg &val, ThreadID tid)
1230{
1231    miscRegfileWrites++;
1232    this->isa[tid]->setMiscReg(misc_reg, val, tcBase(tid));
1233}
1234
1235template <class Impl>
1236uint64_t
1237FullO3CPU<Impl>::readIntReg(int reg_idx)
1238{
1239    intRegfileReads++;
1240    return regFile.readIntReg(reg_idx);
1241}
1242
1243template <class Impl>
1244FloatReg
1245FullO3CPU<Impl>::readFloatReg(int reg_idx)
1246{
1247    fpRegfileReads++;
1248    return regFile.readFloatReg(reg_idx);
1249}
1250
1251template <class Impl>
1252FloatRegBits
1253FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
1254{
1255    fpRegfileReads++;
1256    return regFile.readFloatRegBits(reg_idx);
1257}
1258
1259template <class Impl>
1260CCReg
1261FullO3CPU<Impl>::readCCReg(int reg_idx)
1262{
1263    ccRegfileReads++;
1264    return regFile.readCCReg(reg_idx);
1265}
1266
1267template <class Impl>
1268void
1269FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
1270{
1271    intRegfileWrites++;
1272    regFile.setIntReg(reg_idx, val);
1273}
1274
1275template <class Impl>
1276void
1277FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
1278{
1279    fpRegfileWrites++;
1280    regFile.setFloatReg(reg_idx, val);
1281}
1282
1283template <class Impl>
1284void
1285FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
1286{
1287    fpRegfileWrites++;
1288    regFile.setFloatRegBits(reg_idx, val);
1289}
1290
1291template <class Impl>
1292void
1293FullO3CPU<Impl>::setCCReg(int reg_idx, CCReg val)
1294{
1295    ccRegfileWrites++;
1296    regFile.setCCReg(reg_idx, val);
1297}
1298
1299template <class Impl>
1300uint64_t
1301FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid)
1302{
1303    intRegfileReads++;
1304    PhysRegIndex phys_reg = commitRenameMap[tid].lookupInt(reg_idx);
1305
1306    return regFile.readIntReg(phys_reg);
1307}
1308
1309template <class Impl>
1310float
1311FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid)
1312{
1313    fpRegfileReads++;
1314    PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx);
1315
1316    return regFile.readFloatReg(phys_reg);
1317}
1318
1319template <class Impl>
1320uint64_t
1321FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, ThreadID tid)
1322{
1323    fpRegfileReads++;
1324    PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx);
1325
1326    return regFile.readFloatRegBits(phys_reg);
1327}
1328
1329template <class Impl>
1330CCReg
1331FullO3CPU<Impl>::readArchCCReg(int reg_idx, ThreadID tid)
1332{
1333    ccRegfileReads++;
1334    PhysRegIndex phys_reg = commitRenameMap[tid].lookupCC(reg_idx);
1335
1336    return regFile.readCCReg(phys_reg);
1337}
1338
1339template <class Impl>
1340void
1341FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, ThreadID tid)
1342{
1343    intRegfileWrites++;
1344    PhysRegIndex phys_reg = commitRenameMap[tid].lookupInt(reg_idx);
1345
1346    regFile.setIntReg(phys_reg, val);
1347}
1348
1349template <class Impl>
1350void
1351FullO3CPU<Impl>::setArchFloatReg(int reg_idx, float val, ThreadID tid)
1352{
1353    fpRegfileWrites++;
1354    PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx);
1355
1356    regFile.setFloatReg(phys_reg, val);
1357}
1358
1359template <class Impl>
1360void
1361FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, ThreadID tid)
1362{
1363    fpRegfileWrites++;
1364    PhysRegIndex phys_reg = commitRenameMap[tid].lookupFloat(reg_idx);
1365
1366    regFile.setFloatRegBits(phys_reg, val);
1367}
1368
1369template <class Impl>
1370void
1371FullO3CPU<Impl>::setArchCCReg(int reg_idx, CCReg val, ThreadID tid)
1372{
1373    ccRegfileWrites++;
1374    PhysRegIndex phys_reg = commitRenameMap[tid].lookupCC(reg_idx);
1375
1376    regFile.setCCReg(phys_reg, val);
1377}
1378
1379template <class Impl>
1380TheISA::PCState
1381FullO3CPU<Impl>::pcState(ThreadID tid)
1382{
1383    return commit.pcState(tid);
1384}
1385
1386template <class Impl>
1387void
1388FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid)
1389{
1390    commit.pcState(val, tid);
1391}
1392
1393template <class Impl>
1394Addr
1395FullO3CPU<Impl>::instAddr(ThreadID tid)
1396{
1397    return commit.instAddr(tid);
1398}
1399
1400template <class Impl>
1401Addr
1402FullO3CPU<Impl>::nextInstAddr(ThreadID tid)
1403{
1404    return commit.nextInstAddr(tid);
1405}
1406
1407template <class Impl>
1408MicroPC
1409FullO3CPU<Impl>::microPC(ThreadID tid)
1410{
1411    return commit.microPC(tid);
1412}
1413
1414template <class Impl>
1415void
1416FullO3CPU<Impl>::squashFromTC(ThreadID tid)
1417{
1418    this->thread[tid]->noSquashFromTC = true;
1419    this->commit.generateTCEvent(tid);
1420}
1421
1422template <class Impl>
1423typename FullO3CPU<Impl>::ListIt
1424FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1425{
1426    instList.push_back(inst);
1427
1428    return --(instList.end());
1429}
1430
1431template <class Impl>
1432void
1433FullO3CPU<Impl>::instDone(ThreadID tid, DynInstPtr &inst)
1434{
1435    // Keep an instruction count.
1436    if (!inst->isMicroop() || inst->isLastMicroop()) {
1437        thread[tid]->numInst++;
1438        thread[tid]->numInsts++;
1439        committedInsts[tid]++;
1440        system->totalNumInsts++;
1441
1442        // Check for instruction-count-based events.
1443        comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1444        system->instEventQueue.serviceEvents(system->totalNumInsts);
1445    }
1446    thread[tid]->numOp++;
1447    thread[tid]->numOps++;
1448    committedOps[tid]++;
1449
1450    probeInstCommit(inst->staticInst);
1451}
1452
1453template <class Impl>
1454void
1455FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1456{
1457    DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s "
1458            "[sn:%lli]\n",
1459            inst->threadNumber, inst->pcState(), inst->seqNum);
1460
1461    removeInstsThisCycle = true;
1462
1463    // Remove the front instruction.
1464    removeList.push(inst->getInstListIt());
1465}
1466
1467template <class Impl>
1468void
1469FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid)
1470{
1471    DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1472            " list.\n", tid);
1473
1474    ListIt end_it;
1475
1476    bool rob_empty = false;
1477
1478    if (instList.empty()) {
1479        return;
1480    } else if (rob.isEmpty(tid)) {
1481        DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1482        end_it = instList.begin();
1483        rob_empty = true;
1484    } else {
1485        end_it = (rob.readTailInst(tid))->getInstListIt();
1486        DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1487    }
1488
1489    removeInstsThisCycle = true;
1490
1491    ListIt inst_it = instList.end();
1492
1493    inst_it--;
1494
1495    // Walk through the instruction list, removing any instructions
1496    // that were inserted after the given instruction iterator, end_it.
1497    while (inst_it != end_it) {
1498        assert(!instList.empty());
1499
1500        squashInstIt(inst_it, tid);
1501
1502        inst_it--;
1503    }
1504
1505    // If the ROB was empty, then we actually need to remove the first
1506    // instruction as well.
1507    if (rob_empty) {
1508        squashInstIt(inst_it, tid);
1509    }
1510}
1511
1512template <class Impl>
1513void
1514FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid)
1515{
1516    assert(!instList.empty());
1517
1518    removeInstsThisCycle = true;
1519
1520    ListIt inst_iter = instList.end();
1521
1522    inst_iter--;
1523
1524    DPRINTF(O3CPU, "Deleting instructions from instruction "
1525            "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1526            tid, seq_num, (*inst_iter)->seqNum);
1527
1528    while ((*inst_iter)->seqNum > seq_num) {
1529
1530        bool break_loop = (inst_iter == instList.begin());
1531
1532        squashInstIt(inst_iter, tid);
1533
1534        inst_iter--;
1535
1536        if (break_loop)
1537            break;
1538    }
1539}
1540
1541template <class Impl>
1542inline void
1543FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid)
1544{
1545    if ((*instIt)->threadNumber == tid) {
1546        DPRINTF(O3CPU, "Squashing instruction, "
1547                "[tid:%i] [sn:%lli] PC %s\n",
1548                (*instIt)->threadNumber,
1549                (*instIt)->seqNum,
1550                (*instIt)->pcState());
1551
1552        // Mark it as squashed.
1553        (*instIt)->setSquashed();
1554
1555        // @todo: Formulate a consistent method for deleting
1556        // instructions from the instruction list
1557        // Remove the instruction from the list.
1558        removeList.push(instIt);
1559    }
1560}
1561
1562template <class Impl>
1563void
1564FullO3CPU<Impl>::cleanUpRemovedInsts()
1565{
1566    while (!removeList.empty()) {
1567        DPRINTF(O3CPU, "Removing instruction, "
1568                "[tid:%i] [sn:%lli] PC %s\n",
1569                (*removeList.front())->threadNumber,
1570                (*removeList.front())->seqNum,
1571                (*removeList.front())->pcState());
1572
1573        instList.erase(removeList.front());
1574
1575        removeList.pop();
1576    }
1577
1578    removeInstsThisCycle = false;
1579}
1580/*
1581template <class Impl>
1582void
1583FullO3CPU<Impl>::removeAllInsts()
1584{
1585    instList.clear();
1586}
1587*/
1588template <class Impl>
1589void
1590FullO3CPU<Impl>::dumpInsts()
1591{
1592    int num = 0;
1593
1594    ListIt inst_list_it = instList.begin();
1595
1596    cprintf("Dumping Instruction List\n");
1597
1598    while (inst_list_it != instList.end()) {
1599        cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1600                "Squashed:%i\n\n",
1601                num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber,
1602                (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1603                (*inst_list_it)->isSquashed());
1604        inst_list_it++;
1605        ++num;
1606    }
1607}
1608/*
1609template <class Impl>
1610void
1611FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1612{
1613    iew.wakeDependents(inst);
1614}
1615*/
1616template <class Impl>
1617void
1618FullO3CPU<Impl>::wakeCPU()
1619{
1620    if (activityRec.active() || tickEvent.scheduled()) {
1621        DPRINTF(Activity, "CPU already running.\n");
1622        return;
1623    }
1624
1625    DPRINTF(Activity, "Waking up CPU\n");
1626
1627    Cycles cycles(curCycle() - lastRunningCycle);
1628    // @todo: This is an oddity that is only here to match the stats
1629    if (cycles > 1) {
1630        --cycles;
1631        idleCycles += cycles;
1632        numCycles += cycles;
1633        ppCycles->notify(cycles);
1634    }
1635
1636    schedule(tickEvent, clockEdge());
1637}
1638
1639template <class Impl>
1640void
1641FullO3CPU<Impl>::wakeup(ThreadID tid)
1642{
1643    if (this->thread[tid]->status() != ThreadContext::Suspended)
1644        return;
1645
1646    this->wakeCPU();
1647
1648    DPRINTF(Quiesce, "Suspended Processor woken\n");
1649    this->threadContexts[tid]->activate();
1650}
1651
1652template <class Impl>
1653ThreadID
1654FullO3CPU<Impl>::getFreeTid()
1655{
1656    for (ThreadID tid = 0; tid < numThreads; tid++) {
1657        if (!tids[tid]) {
1658            tids[tid] = true;
1659            return tid;
1660        }
1661    }
1662
1663    return InvalidThreadID;
1664}
1665
1666template <class Impl>
1667void
1668FullO3CPU<Impl>::updateThreadPriority()
1669{
1670    if (activeThreads.size() > 1) {
1671        //DEFAULT TO ROUND ROBIN SCHEME
1672        //e.g. Move highest priority to end of thread list
1673        list<ThreadID>::iterator list_begin = activeThreads.begin();
1674
1675        unsigned high_thread = *list_begin;
1676
1677        activeThreads.erase(list_begin);
1678
1679        activeThreads.push_back(high_thread);
1680    }
1681}
1682
1683// Forward declaration of FullO3CPU.
1684template class FullO3CPU<O3CPUImpl>;
1685