cpu.cc revision 9158 
1/*
2 * Copyright (c) 2011-2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2004-2006 The Regents of The University of Michigan
15 * Copyright (c) 2011 Regents of the University of California
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Kevin Lim
42 *          Korey Sewell
43 *          Rick Strong
44 */
45
46#include "arch/kernel_stats.hh"
47#include "config/the_isa.hh"
48#include "cpu/checker/cpu.hh"
49#include "cpu/checker/thread_context.hh"
50#include "cpu/o3/cpu.hh"
51#include "cpu/o3/isa_specific.hh"
52#include "cpu/o3/thread_context.hh"
53#include "cpu/activity.hh"
54#include "cpu/quiesce_event.hh"
55#include "cpu/simple_thread.hh"
56#include "cpu/thread_context.hh"
57#include "debug/Activity.hh"
58#include "debug/Drain.hh"
59#include "debug/O3CPU.hh"
60#include "debug/Quiesce.hh"
61#include "enums/MemoryMode.hh"
62#include "sim/core.hh"
63#include "sim/full_system.hh"
64#include "sim/process.hh"
65#include "sim/stat_control.hh"
66#include "sim/system.hh"
67
68#if THE_ISA == ALPHA_ISA
69#include "arch/alpha/osfpal.hh"
70#include "debug/Activity.hh"
71#endif
72
73struct BaseCPUParams;
74
75using namespace TheISA;
76using namespace std;
77
78BaseO3CPU::BaseO3CPU(BaseCPUParams *params)
79    : BaseCPU(params)
80{
81}
82
83void
84BaseO3CPU::regStats()
85{
86    BaseCPU::regStats();
87}
88
89template<class Impl>
90bool
91FullO3CPU<Impl>::IcachePort::recvTimingResp(PacketPtr pkt)
92{
93    DPRINTF(O3CPU, "Fetch unit received timing\n");
94    // We shouldn't ever get a block in ownership state
95    assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted()));
96    fetch->processCacheCompletion(pkt);
97
98    return true;
99}
100
101template<class Impl>
102void
103FullO3CPU<Impl>::IcachePort::recvRetry()
104{
105    fetch->recvRetry();
106}
107
108template <class Impl>
109bool
110FullO3CPU<Impl>::DcachePort::recvTimingResp(PacketPtr pkt)
111{
112    return lsq->recvTimingResp(pkt);
113}
114
115template <class Impl>
116void
117FullO3CPU<Impl>::DcachePort::recvTimingSnoopReq(PacketPtr pkt)
118{
119    lsq->recvTimingSnoopReq(pkt);
120}
121
122template <class Impl>
123void
124FullO3CPU<Impl>::DcachePort::recvRetry()
125{
126    lsq->recvRetry();
127}
128
129template <class Impl>
130FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c)
131    : Event(CPU_Tick_Pri), cpu(c)
132{
133}
134
135template <class Impl>
136void
137FullO3CPU<Impl>::TickEvent::process()
138{
139    cpu->tick();
140}
141
142template <class Impl>
143const char *
144FullO3CPU<Impl>::TickEvent::description() const
145{
146    return "FullO3CPU tick";
147}
148
149template <class Impl>
150FullO3CPU<Impl>::ActivateThreadEvent::ActivateThreadEvent()
151    : Event(CPU_Switch_Pri)
152{
153}
154
155template <class Impl>
156void
157FullO3CPU<Impl>::ActivateThreadEvent::init(int thread_num,
158                                           FullO3CPU<Impl> *thread_cpu)
159{
160    tid = thread_num;
161    cpu = thread_cpu;
162}
163
164template <class Impl>
165void
166FullO3CPU<Impl>::ActivateThreadEvent::process()
167{
168    cpu->activateThread(tid);
169}
170
171template <class Impl>
172const char *
173FullO3CPU<Impl>::ActivateThreadEvent::description() const
174{
175    return "FullO3CPU \"Activate Thread\"";
176}
177
178template <class Impl>
179FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent()
180    : Event(CPU_Tick_Pri), tid(0), remove(false), cpu(NULL)
181{
182}
183
184template <class Impl>
185void
186FullO3CPU<Impl>::DeallocateContextEvent::init(int thread_num,
187                                              FullO3CPU<Impl> *thread_cpu)
188{
189    tid = thread_num;
190    cpu = thread_cpu;
191    remove = false;
192}
193
194template <class Impl>
195void
196FullO3CPU<Impl>::DeallocateContextEvent::process()
197{
198    cpu->deactivateThread(tid);
199    if (remove)
200        cpu->removeThread(tid);
201}
202
203template <class Impl>
204const char *
205FullO3CPU<Impl>::DeallocateContextEvent::description() const
206{
207    return "FullO3CPU \"Deallocate Context\"";
208}
209
210template <class Impl>
211FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
212    : BaseO3CPU(params),
213      itb(params->itb),
214      dtb(params->dtb),
215      tickEvent(this),
216#ifndef NDEBUG
217      instcount(0),
218#endif
219      removeInstsThisCycle(false),
220      fetch(this, params),
221      decode(this, params),
222      rename(this, params),
223      iew(this, params),
224      commit(this, params),
225
226      regFile(this, params->numPhysIntRegs,
227              params->numPhysFloatRegs),
228
229      freeList(params->numThreads,
230               TheISA::NumIntRegs, params->numPhysIntRegs,
231               TheISA::NumFloatRegs, params->numPhysFloatRegs),
232
233      rob(this,
234          params->numROBEntries, params->squashWidth,
235          params->smtROBPolicy, params->smtROBThreshold,
236          params->numThreads),
237
238      scoreboard(params->numThreads,
239                 TheISA::NumIntRegs, params->numPhysIntRegs,
240                 TheISA::NumFloatRegs, params->numPhysFloatRegs,
241                 TheISA::NumMiscRegs * numThreads,
242                 TheISA::ZeroReg),
243
244      icachePort(&fetch, this),
245      dcachePort(&iew.ldstQueue, this),
246
247      timeBuffer(params->backComSize, params->forwardComSize),
248      fetchQueue(params->backComSize, params->forwardComSize),
249      decodeQueue(params->backComSize, params->forwardComSize),
250      renameQueue(params->backComSize, params->forwardComSize),
251      iewQueue(params->backComSize, params->forwardComSize),
252      activityRec(name(), NumStages,
253                  params->backComSize + params->forwardComSize,
254                  params->activity),
255
256      globalSeqNum(1),
257      system(params->system),
258      drainCount(0),
259      deferRegistration(params->defer_registration)
260{
261    if (!deferRegistration) {
262        _status = Running;
263    } else {
264        _status = SwitchedOut;
265    }
266
267    if (params->checker) {
268        BaseCPU *temp_checker = params->checker;
269        checker = dynamic_cast<Checker<Impl> *>(temp_checker);
270        checker->setIcachePort(&icachePort);
271        checker->setSystem(params->system);
272    } else {
273        checker = NULL;
274    }
275
276    if (!FullSystem) {
277        thread.resize(numThreads);
278        tids.resize(numThreads);
279    }
280
281    // The stages also need their CPU pointer setup.  However this
282    // must be done at the upper level CPU because they have pointers
283    // to the upper level CPU, and not this FullO3CPU.
284
285    // Set up Pointers to the activeThreads list for each stage
286    fetch.setActiveThreads(&activeThreads);
287    decode.setActiveThreads(&activeThreads);
288    rename.setActiveThreads(&activeThreads);
289    iew.setActiveThreads(&activeThreads);
290    commit.setActiveThreads(&activeThreads);
291
292    // Give each of the stages the time buffer they will use.
293    fetch.setTimeBuffer(&timeBuffer);
294    decode.setTimeBuffer(&timeBuffer);
295    rename.setTimeBuffer(&timeBuffer);
296    iew.setTimeBuffer(&timeBuffer);
297    commit.setTimeBuffer(&timeBuffer);
298
299    // Also setup each of the stages' queues.
300    fetch.setFetchQueue(&fetchQueue);
301    decode.setFetchQueue(&fetchQueue);
302    commit.setFetchQueue(&fetchQueue);
303    decode.setDecodeQueue(&decodeQueue);
304    rename.setDecodeQueue(&decodeQueue);
305    rename.setRenameQueue(&renameQueue);
306    iew.setRenameQueue(&renameQueue);
307    iew.setIEWQueue(&iewQueue);
308    commit.setIEWQueue(&iewQueue);
309    commit.setRenameQueue(&renameQueue);
310
311    commit.setIEWStage(&iew);
312    rename.setIEWStage(&iew);
313    rename.setCommitStage(&commit);
314
315    ThreadID active_threads;
316    if (FullSystem) {
317        active_threads = 1;
318    } else {
319        active_threads = params->workload.size();
320
321        if (active_threads > Impl::MaxThreads) {
322            panic("Workload Size too large. Increase the 'MaxThreads' "
323                  "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) "
324                  "or edit your workload size.");
325        }
326    }
327
328    //Make Sure That this a Valid Architeture
329    assert(params->numPhysIntRegs   >= numThreads * TheISA::NumIntRegs);
330    assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
331
332    rename.setScoreboard(&scoreboard);
333    iew.setScoreboard(&scoreboard);
334
335    // Setup the rename map for whichever stages need it.
336    PhysRegIndex lreg_idx = 0;
337    PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs
338
339    for (ThreadID tid = 0; tid < numThreads; tid++) {
340        bool bindRegs = (tid <= active_threads - 1);
341
342        commitRenameMap[tid].init(TheISA::NumIntRegs,
343                                  params->numPhysIntRegs,
344                                  lreg_idx,            //Index for Logical. Regs
345
346                                  TheISA::NumFloatRegs,
347                                  params->numPhysFloatRegs,
348                                  freg_idx,            //Index for Float Regs
349
350                                  TheISA::NumMiscRegs,
351
352                                  TheISA::ZeroReg,
353                                  TheISA::ZeroReg,
354
355                                  tid,
356                                  false);
357
358        renameMap[tid].init(TheISA::NumIntRegs,
359                            params->numPhysIntRegs,
360                            lreg_idx,                  //Index for Logical. Regs
361
362                            TheISA::NumFloatRegs,
363                            params->numPhysFloatRegs,
364                            freg_idx,                  //Index for Float Regs
365
366                            TheISA::NumMiscRegs,
367
368                            TheISA::ZeroReg,
369                            TheISA::ZeroReg,
370
371                            tid,
372                            bindRegs);
373
374        activateThreadEvent[tid].init(tid, this);
375        deallocateContextEvent[tid].init(tid, this);
376    }
377
378    rename.setRenameMap(renameMap);
379    commit.setRenameMap(commitRenameMap);
380
381    // Give renameMap & rename stage access to the freeList;
382    for (ThreadID tid = 0; tid < numThreads; tid++)
383        renameMap[tid].setFreeList(&freeList);
384    rename.setFreeList(&freeList);
385
386    // Setup the ROB for whichever stages need it.
387    commit.setROB(&rob);
388
389    lastRunningCycle = curTick();
390
391    lastActivatedCycle = 0;
392#if 0
393    // Give renameMap & rename stage access to the freeList;
394    for (ThreadID tid = 0; tid < numThreads; tid++)
395        globalSeqNum[tid] = 1;
396#endif
397
398    contextSwitch = false;
399    DPRINTF(O3CPU, "Creating O3CPU object.\n");
400
401    // Setup any thread state.
402    this->thread.resize(this->numThreads);
403
404    for (ThreadID tid = 0; tid < this->numThreads; ++tid) {
405        if (FullSystem) {
406            // SMT is not supported in FS mode yet.
407            assert(this->numThreads == 1);
408            this->thread[tid] = new Thread(this, 0, NULL);
409        } else {
410            if (tid < params->workload.size()) {
411                DPRINTF(O3CPU, "Workload[%i] process is %#x",
412                        tid, this->thread[tid]);
413                this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
414                        (typename Impl::O3CPU *)(this),
415                        tid, params->workload[tid]);
416
417                //usedTids[tid] = true;
418                //threadMap[tid] = tid;
419            } else {
420                //Allocate Empty thread so M5 can use later
421                //when scheduling threads to CPU
422                Process* dummy_proc = NULL;
423
424                this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
425                        (typename Impl::O3CPU *)(this),
426                        tid, dummy_proc);
427                //usedTids[tid] = false;
428            }
429        }
430
431        ThreadContext *tc;
432
433        // Setup the TC that will serve as the interface to the threads/CPU.
434        O3ThreadContext<Impl> *o3_tc = new O3ThreadContext<Impl>;
435
436        tc = o3_tc;
437
438        // If we're using a checker, then the TC should be the
439        // CheckerThreadContext.
440        if (params->checker) {
441            tc = new CheckerThreadContext<O3ThreadContext<Impl> >(
442                o3_tc, this->checker);
443        }
444
445        o3_tc->cpu = (typename Impl::O3CPU *)(this);
446        assert(o3_tc->cpu);
447        o3_tc->thread = this->thread[tid];
448
449        if (FullSystem) {
450            // Setup quiesce event.
451            this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
452        }
453        // Give the thread the TC.
454        this->thread[tid]->tc = tc;
455
456        // Add the TC to the CPU's list of TC's.
457        this->threadContexts.push_back(tc);
458    }
459
460    // FullO3CPU always requires an interrupt controller.
461    if (!params->defer_registration && !interrupts) {
462        fatal("FullO3CPU %s has no interrupt controller.\n"
463              "Ensure createInterruptController() is called.\n", name());
464    }
465
466    for (ThreadID tid = 0; tid < this->numThreads; tid++)
467        this->thread[tid]->setFuncExeInst(0);
468
469    lockAddr = 0;
470    lockFlag = false;
471}
472
473template <class Impl>
474FullO3CPU<Impl>::~FullO3CPU()
475{
476}
477
478template <class Impl>
479void
480FullO3CPU<Impl>::regStats()
481{
482    BaseO3CPU::regStats();
483
484    // Register any of the O3CPU's stats here.
485    timesIdled
486        .name(name() + ".timesIdled")
487        .desc("Number of times that the entire CPU went into an idle state and"
488              " unscheduled itself")
489        .prereq(timesIdled);
490
491    idleCycles
492        .name(name() + ".idleCycles")
493        .desc("Total number of cycles that the CPU has spent unscheduled due "
494              "to idling")
495        .prereq(idleCycles);
496
497    quiesceCycles
498        .name(name() + ".quiesceCycles")
499        .desc("Total number of cycles that CPU has spent quiesced or waiting "
500              "for an interrupt")
501        .prereq(quiesceCycles);
502
503    // Number of Instructions simulated
504    // --------------------------------
505    // Should probably be in Base CPU but need templated
506    // MaxThreads so put in here instead
507    committedInsts
508        .init(numThreads)
509        .name(name() + ".committedInsts")
510        .desc("Number of Instructions Simulated");
511
512    committedOps
513        .init(numThreads)
514        .name(name() + ".committedOps")
515        .desc("Number of Ops (including micro ops) Simulated");
516
517    totalCommittedInsts
518        .name(name() + ".committedInsts_total")
519        .desc("Number of Instructions Simulated");
520
521    cpi
522        .name(name() + ".cpi")
523        .desc("CPI: Cycles Per Instruction")
524        .precision(6);
525    cpi = numCycles / committedInsts;
526
527    totalCpi
528        .name(name() + ".cpi_total")
529        .desc("CPI: Total CPI of All Threads")
530        .precision(6);
531    totalCpi = numCycles / totalCommittedInsts;
532
533    ipc
534        .name(name() + ".ipc")
535        .desc("IPC: Instructions Per Cycle")
536        .precision(6);
537    ipc =  committedInsts / numCycles;
538
539    totalIpc
540        .name(name() + ".ipc_total")
541        .desc("IPC: Total IPC of All Threads")
542        .precision(6);
543    totalIpc =  totalCommittedInsts / numCycles;
544
545    this->fetch.regStats();
546    this->decode.regStats();
547    this->rename.regStats();
548    this->iew.regStats();
549    this->commit.regStats();
550    this->rob.regStats();
551
552    intRegfileReads
553        .name(name() + ".int_regfile_reads")
554        .desc("number of integer regfile reads")
555        .prereq(intRegfileReads);
556
557    intRegfileWrites
558        .name(name() + ".int_regfile_writes")
559        .desc("number of integer regfile writes")
560        .prereq(intRegfileWrites);
561
562    fpRegfileReads
563        .name(name() + ".fp_regfile_reads")
564        .desc("number of floating regfile reads")
565        .prereq(fpRegfileReads);
566
567    fpRegfileWrites
568        .name(name() + ".fp_regfile_writes")
569        .desc("number of floating regfile writes")
570        .prereq(fpRegfileWrites);
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
589    ++numCycles;
590
591//    activity = false;
592
593    //Tick each of the stages
594    fetch.tick();
595
596    decode.tick();
597
598    rename.tick();
599
600    iew.tick();
601
602    commit.tick();
603
604    if (!FullSystem)
605        doContextSwitch();
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            getState() == SimObject::Drained) {
624            DPRINTF(O3CPU, "Switched out!\n");
625            // increment stat
626            lastRunningCycle = curTick();
627        } else if (!activityRec.active() || _status == Idle) {
628            DPRINTF(O3CPU, "Idle!\n");
629            lastRunningCycle = curTick();
630            timesIdled++;
631        } else {
632            schedule(tickEvent, nextCycle(curTick() + ticks(1)));
633            DPRINTF(O3CPU, "Scheduling next tick!\n");
634        }
635    }
636
637    if (!FullSystem)
638        updateThreadPriority();
639}
640
641template <class Impl>
642void
643FullO3CPU<Impl>::init()
644{
645    BaseCPU::init();
646
647    for (ThreadID tid = 0; tid < numThreads; ++tid) {
648        // Set inSyscall so that the CPU doesn't squash when initially
649        // setting up registers.
650        thread[tid]->inSyscall = true;
651        // Initialise the ThreadContext's memory proxies
652        thread[tid]->initMemProxies(thread[tid]->getTC());
653    }
654
655    // this CPU could still be unconnected if we are restoring from a
656    // checkpoint and this CPU is to be switched in, thus we can only
657    // do this here if the instruction port is actually connected, if
658    // not we have to do it as part of takeOverFrom
659    if (icachePort.isConnected())
660        fetch.setIcache();
661
662    if (FullSystem && !params()->defer_registration) {
663        for (ThreadID tid = 0; tid < numThreads; tid++) {
664            ThreadContext *src_tc = threadContexts[tid];
665            TheISA::initCPU(src_tc, src_tc->contextId());
666        }
667    }
668
669    // Clear inSyscall.
670    for (int tid = 0; tid < numThreads; ++tid)
671        thread[tid]->inSyscall = false;
672
673    // Initialize stages.
674    fetch.initStage();
675    iew.initStage();
676    rename.initStage();
677    commit.initStage();
678
679    commit.setThreads(thread);
680}
681
682template <class Impl>
683void
684FullO3CPU<Impl>::activateThread(ThreadID tid)
685{
686    list<ThreadID>::iterator isActive =
687        std::find(activeThreads.begin(), activeThreads.end(), tid);
688
689    DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid);
690
691    if (isActive == activeThreads.end()) {
692        DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
693                tid);
694
695        activeThreads.push_back(tid);
696    }
697}
698
699template <class Impl>
700void
701FullO3CPU<Impl>::deactivateThread(ThreadID tid)
702{
703    //Remove From Active List, if Active
704    list<ThreadID>::iterator thread_it =
705        std::find(activeThreads.begin(), activeThreads.end(), tid);
706
707    DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid);
708
709    if (thread_it != activeThreads.end()) {
710        DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
711                tid);
712        activeThreads.erase(thread_it);
713    }
714}
715
716template <class Impl>
717Counter
718FullO3CPU<Impl>::totalInsts() const
719{
720    Counter total(0);
721
722    ThreadID size = thread.size();
723    for (ThreadID i = 0; i < size; i++)
724        total += thread[i]->numInst;
725
726    return total;
727}
728
729template <class Impl>
730Counter
731FullO3CPU<Impl>::totalOps() const
732{
733    Counter total(0);
734
735    ThreadID size = thread.size();
736    for (ThreadID i = 0; i < size; i++)
737        total += thread[i]->numOp;
738
739    return total;
740}
741
742template <class Impl>
743void
744FullO3CPU<Impl>::activateContext(ThreadID tid, int delay)
745{
746    // Needs to set each stage to running as well.
747    if (delay){
748        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate "
749                "on cycle %d\n", tid, curTick() + ticks(delay));
750        scheduleActivateThreadEvent(tid, delay);
751    } else {
752        activateThread(tid);
753    }
754
755    // If we are time 0 or if the last activation time is in the past,
756    // schedule the next tick and wake up the fetch unit
757    if (lastActivatedCycle == 0 || lastActivatedCycle < curTick()) {
758        scheduleTickEvent(delay);
759
760        // Be sure to signal that there's some activity so the CPU doesn't
761        // deschedule itself.
762        activityRec.activity();
763        fetch.wakeFromQuiesce();
764
765        quiesceCycles += tickToCycles((curTick() - 1) - lastRunningCycle);
766
767        lastActivatedCycle = curTick();
768
769        _status = Running;
770    }
771}
772
773template <class Impl>
774bool
775FullO3CPU<Impl>::scheduleDeallocateContext(ThreadID tid, bool remove,
776                                           int delay)
777{
778    // Schedule removal of thread data from CPU
779    if (delay){
780        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate "
781                "on cycle %d\n", tid, curTick() + ticks(delay));
782        scheduleDeallocateContextEvent(tid, remove, delay);
783        return false;
784    } else {
785        deactivateThread(tid);
786        if (remove)
787            removeThread(tid);
788        return true;
789    }
790}
791
792template <class Impl>
793void
794FullO3CPU<Impl>::suspendContext(ThreadID tid)
795{
796    DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
797    bool deallocated = scheduleDeallocateContext(tid, false, 1);
798    // If this was the last thread then unschedule the tick event.
799    if ((activeThreads.size() == 1 && !deallocated) ||
800        activeThreads.size() == 0)
801        unscheduleTickEvent();
802
803    DPRINTF(Quiesce, "Suspending Context\n");
804    lastRunningCycle = curTick();
805    _status = Idle;
806}
807
808template <class Impl>
809void
810FullO3CPU<Impl>::haltContext(ThreadID tid)
811{
812    //For now, this is the same as deallocate
813    DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid);
814    scheduleDeallocateContext(tid, true, 1);
815}
816
817template <class Impl>
818void
819FullO3CPU<Impl>::insertThread(ThreadID tid)
820{
821    DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
822    // Will change now that the PC and thread state is internal to the CPU
823    // and not in the ThreadContext.
824    ThreadContext *src_tc;
825    if (FullSystem)
826        src_tc = system->threadContexts[tid];
827    else
828        src_tc = tcBase(tid);
829
830    //Bind Int Regs to Rename Map
831    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
832        PhysRegIndex phys_reg = freeList.getIntReg();
833
834        renameMap[tid].setEntry(ireg,phys_reg);
835        scoreboard.setReg(phys_reg);
836    }
837
838    //Bind Float Regs to Rename Map
839    for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
840        PhysRegIndex phys_reg = freeList.getFloatReg();
841
842        renameMap[tid].setEntry(freg,phys_reg);
843        scoreboard.setReg(phys_reg);
844    }
845
846    //Copy Thread Data Into RegFile
847    //this->copyFromTC(tid);
848
849    //Set PC/NPC/NNPC
850    pcState(src_tc->pcState(), tid);
851
852    src_tc->setStatus(ThreadContext::Active);
853
854    activateContext(tid,1);
855
856    //Reset ROB/IQ/LSQ Entries
857    commit.rob->resetEntries();
858    iew.resetEntries();
859}
860
861template <class Impl>
862void
863FullO3CPU<Impl>::removeThread(ThreadID tid)
864{
865    DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
866
867    // Copy Thread Data From RegFile
868    // If thread is suspended, it might be re-allocated
869    // this->copyToTC(tid);
870
871
872    // @todo: 2-27-2008: Fix how we free up rename mappings
873    // here to alleviate the case for double-freeing registers
874    // in SMT workloads.
875
876    // Unbind Int Regs from Rename Map
877    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
878        PhysRegIndex phys_reg = renameMap[tid].lookup(ireg);
879
880        scoreboard.unsetReg(phys_reg);
881        freeList.addReg(phys_reg);
882    }
883
884    // Unbind Float Regs from Rename Map
885    for (int freg = TheISA::NumIntRegs; freg < TheISA::NumFloatRegs; freg++) {
886        PhysRegIndex phys_reg = renameMap[tid].lookup(freg);
887
888        scoreboard.unsetReg(phys_reg);
889        freeList.addReg(phys_reg);
890    }
891
892    // Squash Throughout Pipeline
893    DynInstPtr inst = commit.rob->readHeadInst(tid);
894    InstSeqNum squash_seq_num = inst->seqNum;
895    fetch.squash(0, squash_seq_num, inst, tid);
896    decode.squash(tid);
897    rename.squash(squash_seq_num, tid);
898    iew.squash(tid);
899    iew.ldstQueue.squash(squash_seq_num, tid);
900    commit.rob->squash(squash_seq_num, tid);
901
902
903    assert(iew.instQueue.getCount(tid) == 0);
904    assert(iew.ldstQueue.getCount(tid) == 0);
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
920
921template <class Impl>
922void
923FullO3CPU<Impl>::activateWhenReady(ThreadID tid)
924{
925    DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming"
926            "(e.g. PhysRegs/ROB/IQ/LSQ) \n",
927            tid);
928
929    bool ready = true;
930
931    if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) {
932        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
933                "Phys. Int. Regs.\n",
934                tid);
935        ready = false;
936    } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) {
937        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
938                "Phys. Float. Regs.\n",
939                tid);
940        ready = false;
941    } else if (commit.rob->numFreeEntries() >=
942               commit.rob->entryAmount(activeThreads.size() + 1)) {
943        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
944                "ROB entries.\n",
945                tid);
946        ready = false;
947    } else if (iew.instQueue.numFreeEntries() >=
948               iew.instQueue.entryAmount(activeThreads.size() + 1)) {
949        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
950                "IQ entries.\n",
951                tid);
952        ready = false;
953    } else if (iew.ldstQueue.numFreeEntries() >=
954               iew.ldstQueue.entryAmount(activeThreads.size() + 1)) {
955        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
956                "LSQ entries.\n",
957                tid);
958        ready = false;
959    }
960
961    if (ready) {
962        insertThread(tid);
963
964        contextSwitch = false;
965
966        cpuWaitList.remove(tid);
967    } else {
968        suspendContext(tid);
969
970        //blocks fetch
971        contextSwitch = true;
972
973        //@todo: dont always add to waitlist
974        //do waitlist
975        cpuWaitList.push_back(tid);
976    }
977}
978
979template <class Impl>
980Fault
981FullO3CPU<Impl>::hwrei(ThreadID tid)
982{
983#if THE_ISA == ALPHA_ISA
984    // Need to clear the lock flag upon returning from an interrupt.
985    this->setMiscRegNoEffect(AlphaISA::MISCREG_LOCKFLAG, false, tid);
986
987    this->thread[tid]->kernelStats->hwrei();
988
989    // FIXME: XXX check for interrupts? XXX
990#endif
991    return NoFault;
992}
993
994template <class Impl>
995bool
996FullO3CPU<Impl>::simPalCheck(int palFunc, ThreadID tid)
997{
998#if THE_ISA == ALPHA_ISA
999    if (this->thread[tid]->kernelStats)
1000        this->thread[tid]->kernelStats->callpal(palFunc,
1001                                                this->threadContexts[tid]);
1002
1003    switch (palFunc) {
1004      case PAL::halt:
1005        halt();
1006        if (--System::numSystemsRunning == 0)
1007            exitSimLoop("all cpus halted");
1008        break;
1009
1010      case PAL::bpt:
1011      case PAL::bugchk:
1012        if (this->system->breakpoint())
1013            return false;
1014        break;
1015    }
1016#endif
1017    return true;
1018}
1019
1020template <class Impl>
1021Fault
1022FullO3CPU<Impl>::getInterrupts()
1023{
1024    // Check if there are any outstanding interrupts
1025    return this->interrupts->getInterrupt(this->threadContexts[0]);
1026}
1027
1028template <class Impl>
1029void
1030FullO3CPU<Impl>::processInterrupts(Fault interrupt)
1031{
1032    // Check for interrupts here.  For now can copy the code that
1033    // exists within isa_fullsys_traits.hh.  Also assume that thread 0
1034    // is the one that handles the interrupts.
1035    // @todo: Possibly consolidate the interrupt checking code.
1036    // @todo: Allow other threads to handle interrupts.
1037
1038    assert(interrupt != NoFault);
1039    this->interrupts->updateIntrInfo(this->threadContexts[0]);
1040
1041    DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name());
1042    this->trap(interrupt, 0, NULL);
1043}
1044
1045template <class Impl>
1046void
1047FullO3CPU<Impl>::trap(Fault fault, ThreadID tid, StaticInstPtr inst)
1048{
1049    // Pass the thread's TC into the invoke method.
1050    fault->invoke(this->threadContexts[tid], inst);
1051}
1052
1053template <class Impl>
1054void
1055FullO3CPU<Impl>::syscall(int64_t callnum, ThreadID tid)
1056{
1057    DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid);
1058
1059    DPRINTF(Activity,"Activity: syscall() called.\n");
1060
1061    // Temporarily increase this by one to account for the syscall
1062    // instruction.
1063    ++(this->thread[tid]->funcExeInst);
1064
1065    // Execute the actual syscall.
1066    this->thread[tid]->syscall(callnum);
1067
1068    // Decrease funcExeInst by one as the normal commit will handle
1069    // incrementing it.
1070    --(this->thread[tid]->funcExeInst);
1071}
1072
1073template <class Impl>
1074void
1075FullO3CPU<Impl>::serialize(std::ostream &os)
1076{
1077    SimObject::State so_state = SimObject::getState();
1078    SERIALIZE_ENUM(so_state);
1079    BaseCPU::serialize(os);
1080    nameOut(os, csprintf("%s.tickEvent", name()));
1081    tickEvent.serialize(os);
1082
1083    // Use SimpleThread's ability to checkpoint to make it easier to
1084    // write out the registers.  Also make this static so it doesn't
1085    // get instantiated multiple times (causes a panic in statistics).
1086    static SimpleThread temp;
1087
1088    ThreadID size = thread.size();
1089    for (ThreadID i = 0; i < size; i++) {
1090        nameOut(os, csprintf("%s.xc.%i", name(), i));
1091        temp.copyTC(thread[i]->getTC());
1092        temp.serialize(os);
1093    }
1094}
1095
1096template <class Impl>
1097void
1098FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string &section)
1099{
1100    SimObject::State so_state;
1101    UNSERIALIZE_ENUM(so_state);
1102    BaseCPU::unserialize(cp, section);
1103    tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
1104
1105    // Use SimpleThread's ability to checkpoint to make it easier to
1106    // read in the registers.  Also make this static so it doesn't
1107    // get instantiated multiple times (causes a panic in statistics).
1108    static SimpleThread temp;
1109
1110    ThreadID size = thread.size();
1111    for (ThreadID i = 0; i < size; i++) {
1112        temp.copyTC(thread[i]->getTC());
1113        temp.unserialize(cp, csprintf("%s.xc.%i", section, i));
1114        thread[i]->getTC()->copyArchRegs(temp.getTC());
1115    }
1116}
1117
1118template <class Impl>
1119unsigned int
1120FullO3CPU<Impl>::drain(Event *drain_event)
1121{
1122    DPRINTF(O3CPU, "Switching out\n");
1123
1124    // If the CPU isn't doing anything, then return immediately.
1125    if (_status == SwitchedOut)
1126        return 0;
1127
1128    drainCount = 0;
1129    fetch.drain();
1130    decode.drain();
1131    rename.drain();
1132    iew.drain();
1133    commit.drain();
1134
1135    // Wake the CPU and record activity so everything can drain out if
1136    // the CPU was not able to immediately drain.
1137    if (getState() != SimObject::Drained) {
1138        // A bit of a hack...set the drainEvent after all the drain()
1139        // calls have been made, that way if all of the stages drain
1140        // immediately, the signalDrained() function knows not to call
1141        // process on the drain event.
1142        drainEvent = drain_event;
1143
1144        wakeCPU();
1145        activityRec.activity();
1146
1147        DPRINTF(Drain, "CPU not drained\n");
1148
1149        return 1;
1150    } else {
1151        return 0;
1152    }
1153}
1154
1155template <class Impl>
1156void
1157FullO3CPU<Impl>::resume()
1158{
1159    fetch.resume();
1160    decode.resume();
1161    rename.resume();
1162    iew.resume();
1163    commit.resume();
1164
1165    changeState(SimObject::Running);
1166
1167    if (_status == SwitchedOut)
1168        return;
1169
1170    assert(system->getMemoryMode() == Enums::timing);
1171
1172    if (!tickEvent.scheduled())
1173        schedule(tickEvent, nextCycle());
1174    _status = Running;
1175}
1176
1177template <class Impl>
1178void
1179FullO3CPU<Impl>::signalDrained()
1180{
1181    if (++drainCount == NumStages) {
1182        if (tickEvent.scheduled())
1183            tickEvent.squash();
1184
1185        changeState(SimObject::Drained);
1186
1187        BaseCPU::switchOut();
1188
1189        if (drainEvent) {
1190            DPRINTF(Drain, "CPU done draining, processing drain event\n");
1191            drainEvent->process();
1192            drainEvent = NULL;
1193        }
1194    }
1195    assert(drainCount <= 5);
1196}
1197
1198template <class Impl>
1199void
1200FullO3CPU<Impl>::switchOut()
1201{
1202    fetch.switchOut();
1203    rename.switchOut();
1204    iew.switchOut();
1205    commit.switchOut();
1206    instList.clear();
1207    while (!removeList.empty()) {
1208        removeList.pop();
1209    }
1210
1211    _status = SwitchedOut;
1212
1213    if (checker)
1214        checker->switchOut();
1215
1216    if (tickEvent.scheduled())
1217        tickEvent.squash();
1218}
1219
1220template <class Impl>
1221void
1222FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
1223{
1224    // Flush out any old data from the time buffers.
1225    for (int i = 0; i < timeBuffer.getSize(); ++i) {
1226        timeBuffer.advance();
1227        fetchQueue.advance();
1228        decodeQueue.advance();
1229        renameQueue.advance();
1230        iewQueue.advance();
1231    }
1232
1233    activityRec.reset();
1234
1235    BaseCPU::takeOverFrom(oldCPU);
1236
1237    fetch.takeOverFrom();
1238    decode.takeOverFrom();
1239    rename.takeOverFrom();
1240    iew.takeOverFrom();
1241    commit.takeOverFrom();
1242
1243    assert(!tickEvent.scheduled() || tickEvent.squashed());
1244
1245    FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU);
1246    if (oldO3CPU)
1247        globalSeqNum = oldO3CPU->globalSeqNum;
1248
1249    // @todo: Figure out how to properly select the tid to put onto
1250    // the active threads list.
1251    ThreadID tid = 0;
1252
1253    list<ThreadID>::iterator isActive =
1254        std::find(activeThreads.begin(), activeThreads.end(), tid);
1255
1256    if (isActive == activeThreads.end()) {
1257        //May Need to Re-code this if the delay variable is the delay
1258        //needed for thread to activate
1259        DPRINTF(O3CPU, "Adding Thread %i to active threads list\n",
1260                tid);
1261
1262        activeThreads.push_back(tid);
1263    }
1264
1265    // Set all statuses to active, schedule the CPU's tick event.
1266    // @todo: Fix up statuses so this is handled properly
1267    ThreadID size = threadContexts.size();
1268    for (ThreadID i = 0; i < size; ++i) {
1269        ThreadContext *tc = threadContexts[i];
1270        if (tc->status() == ThreadContext::Active && _status != Running) {
1271            _status = Running;
1272            reschedule(tickEvent, nextCycle(), true);
1273        }
1274    }
1275    if (!tickEvent.scheduled())
1276        schedule(tickEvent, nextCycle());
1277
1278    lastRunningCycle = curTick();
1279}
1280
1281template <class Impl>
1282TheISA::MiscReg
1283FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid)
1284{
1285    return this->isa[tid].readMiscRegNoEffect(misc_reg);
1286}
1287
1288template <class Impl>
1289TheISA::MiscReg
1290FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid)
1291{
1292    miscRegfileReads++;
1293    return this->isa[tid].readMiscReg(misc_reg, tcBase(tid));
1294}
1295
1296template <class Impl>
1297void
1298FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg,
1299        const TheISA::MiscReg &val, ThreadID tid)
1300{
1301    this->isa[tid].setMiscRegNoEffect(misc_reg, val);
1302}
1303
1304template <class Impl>
1305void
1306FullO3CPU<Impl>::setMiscReg(int misc_reg,
1307        const TheISA::MiscReg &val, ThreadID tid)
1308{
1309    miscRegfileWrites++;
1310    this->isa[tid].setMiscReg(misc_reg, val, tcBase(tid));
1311}
1312
1313template <class Impl>
1314uint64_t
1315FullO3CPU<Impl>::readIntReg(int reg_idx)
1316{
1317    intRegfileReads++;
1318    return regFile.readIntReg(reg_idx);
1319}
1320
1321template <class Impl>
1322FloatReg
1323FullO3CPU<Impl>::readFloatReg(int reg_idx)
1324{
1325    fpRegfileReads++;
1326    return regFile.readFloatReg(reg_idx);
1327}
1328
1329template <class Impl>
1330FloatRegBits
1331FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
1332{
1333    fpRegfileReads++;
1334    return regFile.readFloatRegBits(reg_idx);
1335}
1336
1337template <class Impl>
1338void
1339FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
1340{
1341    intRegfileWrites++;
1342    regFile.setIntReg(reg_idx, val);
1343}
1344
1345template <class Impl>
1346void
1347FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
1348{
1349    fpRegfileWrites++;
1350    regFile.setFloatReg(reg_idx, val);
1351}
1352
1353template <class Impl>
1354void
1355FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
1356{
1357    fpRegfileWrites++;
1358    regFile.setFloatRegBits(reg_idx, val);
1359}
1360
1361template <class Impl>
1362uint64_t
1363FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid)
1364{
1365    intRegfileReads++;
1366    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1367
1368    return regFile.readIntReg(phys_reg);
1369}
1370
1371template <class Impl>
1372float
1373FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid)
1374{
1375    fpRegfileReads++;
1376    int idx = reg_idx + TheISA::NumIntRegs;
1377    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1378
1379    return regFile.readFloatReg(phys_reg);
1380}
1381
1382template <class Impl>
1383uint64_t
1384FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, ThreadID tid)
1385{
1386    fpRegfileReads++;
1387    int idx = reg_idx + TheISA::NumIntRegs;
1388    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1389
1390    return regFile.readFloatRegBits(phys_reg);
1391}
1392
1393template <class Impl>
1394void
1395FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, ThreadID tid)
1396{
1397    intRegfileWrites++;
1398    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1399
1400    regFile.setIntReg(phys_reg, val);
1401}
1402
1403template <class Impl>
1404void
1405FullO3CPU<Impl>::setArchFloatReg(int reg_idx, float val, ThreadID tid)
1406{
1407    fpRegfileWrites++;
1408    int idx = reg_idx + TheISA::NumIntRegs;
1409    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1410
1411    regFile.setFloatReg(phys_reg, val);
1412}
1413
1414template <class Impl>
1415void
1416FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, ThreadID tid)
1417{
1418    fpRegfileWrites++;
1419    int idx = reg_idx + TheISA::NumIntRegs;
1420    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1421
1422    regFile.setFloatRegBits(phys_reg, val);
1423}
1424
1425template <class Impl>
1426TheISA::PCState
1427FullO3CPU<Impl>::pcState(ThreadID tid)
1428{
1429    return commit.pcState(tid);
1430}
1431
1432template <class Impl>
1433void
1434FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid)
1435{
1436    commit.pcState(val, tid);
1437}
1438
1439template <class Impl>
1440Addr
1441FullO3CPU<Impl>::instAddr(ThreadID tid)
1442{
1443    return commit.instAddr(tid);
1444}
1445
1446template <class Impl>
1447Addr
1448FullO3CPU<Impl>::nextInstAddr(ThreadID tid)
1449{
1450    return commit.nextInstAddr(tid);
1451}
1452
1453template <class Impl>
1454MicroPC
1455FullO3CPU<Impl>::microPC(ThreadID tid)
1456{
1457    return commit.microPC(tid);
1458}
1459
1460template <class Impl>
1461void
1462FullO3CPU<Impl>::squashFromTC(ThreadID tid)
1463{
1464    this->thread[tid]->inSyscall = true;
1465    this->commit.generateTCEvent(tid);
1466}
1467
1468template <class Impl>
1469typename FullO3CPU<Impl>::ListIt
1470FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1471{
1472    instList.push_back(inst);
1473
1474    return --(instList.end());
1475}
1476
1477template <class Impl>
1478void
1479FullO3CPU<Impl>::instDone(ThreadID tid, DynInstPtr &inst)
1480{
1481    // Keep an instruction count.
1482    if (!inst->isMicroop() || inst->isLastMicroop()) {
1483        thread[tid]->numInst++;
1484        thread[tid]->numInsts++;
1485        committedInsts[tid]++;
1486        totalCommittedInsts++;
1487    }
1488    thread[tid]->numOp++;
1489    thread[tid]->numOps++;
1490    committedOps[tid]++;
1491
1492    system->totalNumInsts++;
1493    // Check for instruction-count-based events.
1494    comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1495    system->instEventQueue.serviceEvents(system->totalNumInsts);
1496}
1497
1498template <class Impl>
1499void
1500FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1501{
1502    DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s "
1503            "[sn:%lli]\n",
1504            inst->threadNumber, inst->pcState(), inst->seqNum);
1505
1506    removeInstsThisCycle = true;
1507
1508    // Remove the front instruction.
1509    removeList.push(inst->getInstListIt());
1510}
1511
1512template <class Impl>
1513void
1514FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid)
1515{
1516    DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1517            " list.\n", tid);
1518
1519    ListIt end_it;
1520
1521    bool rob_empty = false;
1522
1523    if (instList.empty()) {
1524        return;
1525    } else if (rob.isEmpty(/*tid*/)) {
1526        DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1527        end_it = instList.begin();
1528        rob_empty = true;
1529    } else {
1530        end_it = (rob.readTailInst(tid))->getInstListIt();
1531        DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1532    }
1533
1534    removeInstsThisCycle = true;
1535
1536    ListIt inst_it = instList.end();
1537
1538    inst_it--;
1539
1540    // Walk through the instruction list, removing any instructions
1541    // that were inserted after the given instruction iterator, end_it.
1542    while (inst_it != end_it) {
1543        assert(!instList.empty());
1544
1545        squashInstIt(inst_it, tid);
1546
1547        inst_it--;
1548    }
1549
1550    // If the ROB was empty, then we actually need to remove the first
1551    // instruction as well.
1552    if (rob_empty) {
1553        squashInstIt(inst_it, tid);
1554    }
1555}
1556
1557template <class Impl>
1558void
1559FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid)
1560{
1561    assert(!instList.empty());
1562
1563    removeInstsThisCycle = true;
1564
1565    ListIt inst_iter = instList.end();
1566
1567    inst_iter--;
1568
1569    DPRINTF(O3CPU, "Deleting instructions from instruction "
1570            "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1571            tid, seq_num, (*inst_iter)->seqNum);
1572
1573    while ((*inst_iter)->seqNum > seq_num) {
1574
1575        bool break_loop = (inst_iter == instList.begin());
1576
1577        squashInstIt(inst_iter, tid);
1578
1579        inst_iter--;
1580
1581        if (break_loop)
1582            break;
1583    }
1584}
1585
1586template <class Impl>
1587inline void
1588FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid)
1589{
1590    if ((*instIt)->threadNumber == tid) {
1591        DPRINTF(O3CPU, "Squashing instruction, "
1592                "[tid:%i] [sn:%lli] PC %s\n",
1593                (*instIt)->threadNumber,
1594                (*instIt)->seqNum,
1595                (*instIt)->pcState());
1596
1597        // Mark it as squashed.
1598        (*instIt)->setSquashed();
1599
1600        // @todo: Formulate a consistent method for deleting
1601        // instructions from the instruction list
1602        // Remove the instruction from the list.
1603        removeList.push(instIt);
1604    }
1605}
1606
1607template <class Impl>
1608void
1609FullO3CPU<Impl>::cleanUpRemovedInsts()
1610{
1611    while (!removeList.empty()) {
1612        DPRINTF(O3CPU, "Removing instruction, "
1613                "[tid:%i] [sn:%lli] PC %s\n",
1614                (*removeList.front())->threadNumber,
1615                (*removeList.front())->seqNum,
1616                (*removeList.front())->pcState());
1617
1618        instList.erase(removeList.front());
1619
1620        removeList.pop();
1621    }
1622
1623    removeInstsThisCycle = false;
1624}
1625/*
1626template <class Impl>
1627void
1628FullO3CPU<Impl>::removeAllInsts()
1629{
1630    instList.clear();
1631}
1632*/
1633template <class Impl>
1634void
1635FullO3CPU<Impl>::dumpInsts()
1636{
1637    int num = 0;
1638
1639    ListIt inst_list_it = instList.begin();
1640
1641    cprintf("Dumping Instruction List\n");
1642
1643    while (inst_list_it != instList.end()) {
1644        cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1645                "Squashed:%i\n\n",
1646                num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber,
1647                (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1648                (*inst_list_it)->isSquashed());
1649        inst_list_it++;
1650        ++num;
1651    }
1652}
1653/*
1654template <class Impl>
1655void
1656FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1657{
1658    iew.wakeDependents(inst);
1659}
1660*/
1661template <class Impl>
1662void
1663FullO3CPU<Impl>::wakeCPU()
1664{
1665    if (activityRec.active() || tickEvent.scheduled()) {
1666        DPRINTF(Activity, "CPU already running.\n");
1667        return;
1668    }
1669
1670    DPRINTF(Activity, "Waking up CPU\n");
1671
1672    idleCycles += tickToCycles((curTick() - 1) - lastRunningCycle);
1673    numCycles += tickToCycles((curTick() - 1) - lastRunningCycle);
1674
1675    schedule(tickEvent, nextCycle());
1676}
1677
1678template <class Impl>
1679void
1680FullO3CPU<Impl>::wakeup()
1681{
1682    if (this->thread[0]->status() != ThreadContext::Suspended)
1683        return;
1684
1685    this->wakeCPU();
1686
1687    DPRINTF(Quiesce, "Suspended Processor woken\n");
1688    this->threadContexts[0]->activate();
1689}
1690
1691template <class Impl>
1692ThreadID
1693FullO3CPU<Impl>::getFreeTid()
1694{
1695    for (ThreadID tid = 0; tid < numThreads; tid++) {
1696        if (!tids[tid]) {
1697            tids[tid] = true;
1698            return tid;
1699        }
1700    }
1701
1702    return InvalidThreadID;
1703}
1704
1705template <class Impl>
1706void
1707FullO3CPU<Impl>::doContextSwitch()
1708{
1709    if (contextSwitch) {
1710
1711        //ADD CODE TO DEACTIVE THREAD HERE (???)
1712
1713        ThreadID size = cpuWaitList.size();
1714        for (ThreadID tid = 0; tid < size; tid++) {
1715            activateWhenReady(tid);
1716        }
1717
1718        if (cpuWaitList.size() == 0)
1719            contextSwitch = true;
1720    }
1721}
1722
1723template <class Impl>
1724void
1725FullO3CPU<Impl>::updateThreadPriority()
1726{
1727    if (activeThreads.size() > 1) {
1728        //DEFAULT TO ROUND ROBIN SCHEME
1729        //e.g. Move highest priority to end of thread list
1730        list<ThreadID>::iterator list_begin = activeThreads.begin();
1731
1732        unsigned high_thread = *list_begin;
1733
1734        activeThreads.erase(list_begin);
1735
1736        activeThreads.push_back(high_thread);
1737    }
1738}
1739
1740// Forward declaration of FullO3CPU.
1741template class FullO3CPU<O3CPUImpl>;
1742