cpu.cc revision 2876:a862ab9f93f8 
1/*
2 * Copyright (c) 2004-2006 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Kevin Lim
29 *          Korey Sewell
30 */
31
32#include "config/full_system.hh"
33#include "config/use_checker.hh"
34
35#if FULL_SYSTEM
36#include "sim/system.hh"
37#else
38#include "sim/process.hh"
39#endif
40
41#include "cpu/activity.hh"
42#include "cpu/simple_thread.hh"
43#include "cpu/thread_context.hh"
44#include "cpu/o3/isa_specific.hh"
45#include "cpu/o3/cpu.hh"
46
47#include "sim/root.hh"
48#include "sim/stat_control.hh"
49
50#if USE_CHECKER
51#include "cpu/checker/cpu.hh"
52#endif
53
54using namespace std;
55using namespace TheISA;
56
57BaseO3CPU::BaseO3CPU(Params *params)
58    : BaseCPU(params), cpu_id(0)
59{
60}
61
62void
63BaseO3CPU::regStats()
64{
65    BaseCPU::regStats();
66}
67
68template <class Impl>
69FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c)
70    : Event(&mainEventQueue, CPU_Tick_Pri), cpu(c)
71{
72}
73
74template <class Impl>
75void
76FullO3CPU<Impl>::TickEvent::process()
77{
78    cpu->tick();
79}
80
81template <class Impl>
82const char *
83FullO3CPU<Impl>::TickEvent::description()
84{
85    return "FullO3CPU tick event";
86}
87
88template <class Impl>
89FullO3CPU<Impl>::ActivateThreadEvent::ActivateThreadEvent()
90    : Event(&mainEventQueue, CPU_Tick_Pri)
91{
92}
93
94template <class Impl>
95void
96FullO3CPU<Impl>::ActivateThreadEvent::init(int thread_num,
97                                           FullO3CPU<Impl> *thread_cpu)
98{
99    tid = thread_num;
100    cpu = thread_cpu;
101}
102
103template <class Impl>
104void
105FullO3CPU<Impl>::ActivateThreadEvent::process()
106{
107    cpu->activateThread(tid);
108}
109
110template <class Impl>
111const char *
112FullO3CPU<Impl>::ActivateThreadEvent::description()
113{
114    return "FullO3CPU \"Activate Thread\" event";
115}
116
117template <class Impl>
118FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent()
119    : Event(&mainEventQueue, CPU_Tick_Pri)
120{
121}
122
123template <class Impl>
124void
125FullO3CPU<Impl>::DeallocateContextEvent::init(int thread_num,
126                                           FullO3CPU<Impl> *thread_cpu)
127{
128    tid = thread_num;
129    cpu = thread_cpu;
130}
131
132template <class Impl>
133void
134FullO3CPU<Impl>::DeallocateContextEvent::process()
135{
136    cpu->deactivateThread(tid);
137    cpu->removeThread(tid);
138}
139
140template <class Impl>
141const char *
142FullO3CPU<Impl>::DeallocateContextEvent::description()
143{
144    return "FullO3CPU \"Deallocate Context\" event";
145}
146
147template <class Impl>
148FullO3CPU<Impl>::FullO3CPU(Params *params)
149    : BaseO3CPU(params),
150      tickEvent(this),
151      removeInstsThisCycle(false),
152      fetch(params),
153      decode(params),
154      rename(params),
155      iew(params),
156      commit(params),
157
158      regFile(params->numPhysIntRegs, params->numPhysFloatRegs),
159
160      freeList(params->numberOfThreads,
161               TheISA::NumIntRegs, params->numPhysIntRegs,
162               TheISA::NumFloatRegs, params->numPhysFloatRegs),
163
164      rob(params->numROBEntries, params->squashWidth,
165          params->smtROBPolicy, params->smtROBThreshold,
166          params->numberOfThreads),
167
168      scoreboard(params->numberOfThreads,
169                 TheISA::NumIntRegs, params->numPhysIntRegs,
170                 TheISA::NumFloatRegs, params->numPhysFloatRegs,
171                 TheISA::NumMiscRegs * number_of_threads,
172                 TheISA::ZeroReg),
173
174      // For now just have these time buffers be pretty big.
175      // @todo: Make these time buffer sizes parameters or derived
176      // from latencies
177      timeBuffer(5, 5),
178      fetchQueue(5, 5),
179      decodeQueue(5, 5),
180      renameQueue(5, 5),
181      iewQueue(5, 5),
182      activityRec(NumStages, 10, params->activity),
183
184      globalSeqNum(1),
185
186#if FULL_SYSTEM
187      system(params->system),
188      physmem(system->physmem),
189#endif // FULL_SYSTEM
190      mem(params->mem),
191      drainCount(0),
192      deferRegistration(params->deferRegistration),
193      numThreads(number_of_threads)
194{
195    _status = Idle;
196
197    checker = NULL;
198
199    if (params->checker) {
200#if USE_CHECKER
201        BaseCPU *temp_checker = params->checker;
202        checker = dynamic_cast<Checker<DynInstPtr> *>(temp_checker);
203        checker->setMemory(mem);
204#if FULL_SYSTEM
205        checker->setSystem(params->system);
206#endif
207#else
208        panic("Checker enabled but not compiled in!");
209#endif // USE_CHECKER
210    }
211
212#if !FULL_SYSTEM
213    thread.resize(number_of_threads);
214    tids.resize(number_of_threads);
215#endif
216
217    // The stages also need their CPU pointer setup.  However this
218    // must be done at the upper level CPU because they have pointers
219    // to the upper level CPU, and not this FullO3CPU.
220
221    // Set up Pointers to the activeThreads list for each stage
222    fetch.setActiveThreads(&activeThreads);
223    decode.setActiveThreads(&activeThreads);
224    rename.setActiveThreads(&activeThreads);
225    iew.setActiveThreads(&activeThreads);
226    commit.setActiveThreads(&activeThreads);
227
228    // Give each of the stages the time buffer they will use.
229    fetch.setTimeBuffer(&timeBuffer);
230    decode.setTimeBuffer(&timeBuffer);
231    rename.setTimeBuffer(&timeBuffer);
232    iew.setTimeBuffer(&timeBuffer);
233    commit.setTimeBuffer(&timeBuffer);
234
235    // Also setup each of the stages' queues.
236    fetch.setFetchQueue(&fetchQueue);
237    decode.setFetchQueue(&fetchQueue);
238    commit.setFetchQueue(&fetchQueue);
239    decode.setDecodeQueue(&decodeQueue);
240    rename.setDecodeQueue(&decodeQueue);
241    rename.setRenameQueue(&renameQueue);
242    iew.setRenameQueue(&renameQueue);
243    iew.setIEWQueue(&iewQueue);
244    commit.setIEWQueue(&iewQueue);
245    commit.setRenameQueue(&renameQueue);
246
247    commit.setFetchStage(&fetch);
248    commit.setIEWStage(&iew);
249    rename.setIEWStage(&iew);
250    rename.setCommitStage(&commit);
251
252#if !FULL_SYSTEM
253    int active_threads = params->workload.size();
254
255    if (active_threads > Impl::MaxThreads) {
256        panic("Workload Size too large. Increase the 'MaxThreads'"
257              "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) or "
258              "edit your workload size.");
259    }
260#else
261    int active_threads = 1;
262#endif
263
264    //Make Sure That this a Valid Architeture
265    assert(params->numPhysIntRegs   >= numThreads * TheISA::NumIntRegs);
266    assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
267
268    rename.setScoreboard(&scoreboard);
269    iew.setScoreboard(&scoreboard);
270
271    // Setup the rename map for whichever stages need it.
272    PhysRegIndex lreg_idx = 0;
273    PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs
274
275    for (int tid=0; tid < numThreads; tid++) {
276        bool bindRegs = (tid <= active_threads - 1);
277
278        commitRenameMap[tid].init(TheISA::NumIntRegs,
279                                  params->numPhysIntRegs,
280                                  lreg_idx,            //Index for Logical. Regs
281
282                                  TheISA::NumFloatRegs,
283                                  params->numPhysFloatRegs,
284                                  freg_idx,            //Index for Float Regs
285
286                                  TheISA::NumMiscRegs,
287
288                                  TheISA::ZeroReg,
289                                  TheISA::ZeroReg,
290
291                                  tid,
292                                  false);
293
294        renameMap[tid].init(TheISA::NumIntRegs,
295                            params->numPhysIntRegs,
296                            lreg_idx,                  //Index for Logical. Regs
297
298                            TheISA::NumFloatRegs,
299                            params->numPhysFloatRegs,
300                            freg_idx,                  //Index for Float Regs
301
302                            TheISA::NumMiscRegs,
303
304                            TheISA::ZeroReg,
305                            TheISA::ZeroReg,
306
307                            tid,
308                            bindRegs);
309    }
310
311    rename.setRenameMap(renameMap);
312    commit.setRenameMap(commitRenameMap);
313
314    // Give renameMap & rename stage access to the freeList;
315    for (int i=0; i < numThreads; i++) {
316        renameMap[i].setFreeList(&freeList);
317    }
318    rename.setFreeList(&freeList);
319
320    // Setup the ROB for whichever stages need it.
321    commit.setROB(&rob);
322
323    lastRunningCycle = curTick;
324
325    lastActivatedCycle = -1;
326
327    contextSwitch = false;
328}
329
330template <class Impl>
331FullO3CPU<Impl>::~FullO3CPU()
332{
333}
334
335template <class Impl>
336void
337FullO3CPU<Impl>::fullCPURegStats()
338{
339    BaseO3CPU::regStats();
340
341    // Register any of the O3CPU's stats here.
342    timesIdled
343        .name(name() + ".timesIdled")
344        .desc("Number of times that the entire CPU went into an idle state and"
345              " unscheduled itself")
346        .prereq(timesIdled);
347
348    idleCycles
349        .name(name() + ".idleCycles")
350        .desc("Total number of cycles that the CPU has spent unscheduled due "
351              "to idling")
352        .prereq(idleCycles);
353
354    // Number of Instructions simulated
355    // --------------------------------
356    // Should probably be in Base CPU but need templated
357    // MaxThreads so put in here instead
358    committedInsts
359        .init(numThreads)
360        .name(name() + ".committedInsts")
361        .desc("Number of Instructions Simulated");
362
363    totalCommittedInsts
364        .name(name() + ".committedInsts_total")
365        .desc("Number of Instructions Simulated");
366
367    cpi
368        .name(name() + ".cpi")
369        .desc("CPI: Cycles Per Instruction")
370        .precision(6);
371    cpi = simTicks / committedInsts;
372
373    totalCpi
374        .name(name() + ".cpi_total")
375        .desc("CPI: Total CPI of All Threads")
376        .precision(6);
377    totalCpi = simTicks / totalCommittedInsts;
378
379    ipc
380        .name(name() + ".ipc")
381        .desc("IPC: Instructions Per Cycle")
382        .precision(6);
383    ipc =  committedInsts / simTicks;
384
385    totalIpc
386        .name(name() + ".ipc_total")
387        .desc("IPC: Total IPC of All Threads")
388        .precision(6);
389    totalIpc =  totalCommittedInsts / simTicks;
390
391}
392
393template <class Impl>
394void
395FullO3CPU<Impl>::tick()
396{
397    DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
398
399    ++numCycles;
400
401//    activity = false;
402
403    //Tick each of the stages
404    fetch.tick();
405
406    decode.tick();
407
408    rename.tick();
409
410    iew.tick();
411
412    commit.tick();
413
414#if !FULL_SYSTEM
415    doContextSwitch();
416#endif
417
418    // Now advance the time buffers
419    timeBuffer.advance();
420
421    fetchQueue.advance();
422    decodeQueue.advance();
423    renameQueue.advance();
424    iewQueue.advance();
425
426    activityRec.advance();
427
428    if (removeInstsThisCycle) {
429        cleanUpRemovedInsts();
430    }
431
432    if (!tickEvent.scheduled()) {
433        if (_status == SwitchedOut) {
434            // increment stat
435            lastRunningCycle = curTick;
436        } else if (!activityRec.active()) {
437            lastRunningCycle = curTick;
438            timesIdled++;
439        } else {
440            tickEvent.schedule(curTick + cycles(1));
441        }
442    }
443
444#if !FULL_SYSTEM
445    updateThreadPriority();
446#endif
447
448}
449
450template <class Impl>
451void
452FullO3CPU<Impl>::init()
453{
454    if (!deferRegistration) {
455        registerThreadContexts();
456    }
457
458    // Set inSyscall so that the CPU doesn't squash when initially
459    // setting up registers.
460    for (int i = 0; i < number_of_threads; ++i)
461        thread[i]->inSyscall = true;
462
463    for (int tid=0; tid < number_of_threads; tid++) {
464#if FULL_SYSTEM
465        ThreadContext *src_tc = threadContexts[tid];
466#else
467        ThreadContext *src_tc = thread[tid]->getTC();
468#endif
469        // Threads start in the Suspended State
470        if (src_tc->status() != ThreadContext::Suspended) {
471            continue;
472        }
473
474#if FULL_SYSTEM
475        TheISA::initCPU(src_tc, src_tc->readCpuId());
476#endif
477    }
478
479    // Clear inSyscall.
480    for (int i = 0; i < number_of_threads; ++i)
481        thread[i]->inSyscall = false;
482
483    // Initialize stages.
484    fetch.initStage();
485    iew.initStage();
486    rename.initStage();
487    commit.initStage();
488
489    commit.setThreads(thread);
490}
491
492template <class Impl>
493void
494FullO3CPU<Impl>::activateThread(unsigned tid)
495{
496    list<unsigned>::iterator isActive = find(
497        activeThreads.begin(), activeThreads.end(), tid);
498
499    if (isActive == activeThreads.end()) {
500        DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
501                tid);
502
503        activeThreads.push_back(tid);
504    }
505}
506
507template <class Impl>
508void
509FullO3CPU<Impl>::deactivateThread(unsigned tid)
510{
511    //Remove From Active List, if Active
512    list<unsigned>::iterator thread_it =
513        find(activeThreads.begin(), activeThreads.end(), tid);
514
515    if (thread_it != activeThreads.end()) {
516        DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
517                tid);
518        activeThreads.erase(thread_it);
519    }
520}
521
522template <class Impl>
523void
524FullO3CPU<Impl>::activateContext(int tid, int delay)
525{
526    // Needs to set each stage to running as well.
527    if (delay){
528        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate "
529                "on cycle %d\n", tid, curTick + cycles(delay));
530        scheduleActivateThreadEvent(tid, delay);
531    } else {
532        activateThread(tid);
533    }
534
535    if(lastActivatedCycle < curTick) {
536        scheduleTickEvent(delay);
537
538        // Be sure to signal that there's some activity so the CPU doesn't
539        // deschedule itself.
540        activityRec.activity();
541        fetch.wakeFromQuiesce();
542
543        lastActivatedCycle = curTick;
544
545        _status = Running;
546    }
547}
548
549template <class Impl>
550void
551FullO3CPU<Impl>::deallocateContext(int tid, int delay)
552{
553    // Schedule removal of thread data from CPU
554    if (delay){
555        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate "
556                "on cycle %d\n", tid, curTick + cycles(delay));
557        scheduleDeallocateContextEvent(tid, delay);
558    } else {
559        deactivateThread(tid);
560        removeThread(tid);
561    }
562}
563
564template <class Impl>
565void
566FullO3CPU<Impl>::suspendContext(int tid)
567{
568    DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
569    unscheduleTickEvent();
570    _status = Idle;
571/*
572    //Remove From Active List, if Active
573    list<unsigned>::iterator isActive = find(
574        activeThreads.begin(), activeThreads.end(), tid);
575
576    if (isActive != activeThreads.end()) {
577        DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
578                tid);
579        activeThreads.erase(isActive);
580    }
581*/
582}
583
584template <class Impl>
585void
586FullO3CPU<Impl>::haltContext(int tid)
587{
588    DPRINTF(O3CPU,"[tid:%i]: Halting Thread Context", tid);
589/*
590    //Remove From Active List, if Active
591    list<unsigned>::iterator isActive = find(
592        activeThreads.begin(), activeThreads.end(), tid);
593
594    if (isActive != activeThreads.end()) {
595        DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
596                tid);
597        activeThreads.erase(isActive);
598
599        removeThread(tid);
600    }
601*/
602}
603
604template <class Impl>
605void
606FullO3CPU<Impl>::insertThread(unsigned tid)
607{
608    DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
609    // Will change now that the PC and thread state is internal to the CPU
610    // and not in the ThreadContext.
611#if FULL_SYSTEM
612    ThreadContext *src_tc = system->threadContexts[tid];
613#else
614    ThreadContext *src_tc = tcBase(tid);
615#endif
616
617    //Bind Int Regs to Rename Map
618    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
619        PhysRegIndex phys_reg = freeList.getIntReg();
620
621        renameMap[tid].setEntry(ireg,phys_reg);
622        scoreboard.setReg(phys_reg);
623    }
624
625    //Bind Float Regs to Rename Map
626    for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
627        PhysRegIndex phys_reg = freeList.getFloatReg();
628
629        renameMap[tid].setEntry(freg,phys_reg);
630        scoreboard.setReg(phys_reg);
631    }
632
633    //Copy Thread Data Into RegFile
634    //this->copyFromTC(tid);
635
636    //Set PC/NPC/NNPC
637    setPC(src_tc->readPC(), tid);
638    setNextPC(src_tc->readNextPC(), tid);
639#if THE_ISA != ALPHA_ISA
640    setNextNPC(src_tc->readNextNPC(), tid);
641#endif
642
643    src_tc->setStatus(ThreadContext::Active);
644
645    activateContext(tid,1);
646
647    //Reset ROB/IQ/LSQ Entries
648    commit.rob->resetEntries();
649    iew.resetEntries();
650}
651
652template <class Impl>
653void
654FullO3CPU<Impl>::removeThread(unsigned tid)
655{
656    DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.");
657
658    // Copy Thread Data From RegFile
659    // If thread is suspended, it might be re-allocated
660    //this->copyToTC(tid);
661
662    // Unbind Int Regs from Rename Map
663    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
664        PhysRegIndex phys_reg = renameMap[tid].lookup(ireg);
665
666        scoreboard.unsetReg(phys_reg);
667        freeList.addReg(phys_reg);
668    }
669
670    // Unbind Float Regs from Rename Map
671    for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
672        PhysRegIndex phys_reg = renameMap[tid].lookup(freg);
673
674        scoreboard.unsetReg(phys_reg);
675        freeList.addReg(phys_reg);
676    }
677
678    // Squash Throughout Pipeline
679    fetch.squash(0,tid);
680    decode.squash(tid);
681    rename.squash(tid);
682    iew.squash(tid);
683    commit.rob->squash(commit.rob->readHeadInst(tid)->seqNum, tid);
684
685    assert(iew.ldstQueue.getCount(tid) == 0);
686
687    // Reset ROB/IQ/LSQ Entries
688    if (activeThreads.size() >= 1) {
689        commit.rob->resetEntries();
690        iew.resetEntries();
691    }
692}
693
694
695template <class Impl>
696void
697FullO3CPU<Impl>::activateWhenReady(int tid)
698{
699    DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming"
700            "(e.g. PhysRegs/ROB/IQ/LSQ) \n",
701            tid);
702
703    bool ready = true;
704
705    if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) {
706        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
707                "Phys. Int. Regs.\n",
708                tid);
709        ready = false;
710    } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) {
711        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
712                "Phys. Float. Regs.\n",
713                tid);
714        ready = false;
715    } else if (commit.rob->numFreeEntries() >=
716               commit.rob->entryAmount(activeThreads.size() + 1)) {
717        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
718                "ROB entries.\n",
719                tid);
720        ready = false;
721    } else if (iew.instQueue.numFreeEntries() >=
722               iew.instQueue.entryAmount(activeThreads.size() + 1)) {
723        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
724                "IQ entries.\n",
725                tid);
726        ready = false;
727    } else if (iew.ldstQueue.numFreeEntries() >=
728               iew.ldstQueue.entryAmount(activeThreads.size() + 1)) {
729        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
730                "LSQ entries.\n",
731                tid);
732        ready = false;
733    }
734
735    if (ready) {
736        insertThread(tid);
737
738        contextSwitch = false;
739
740        cpuWaitList.remove(tid);
741    } else {
742        suspendContext(tid);
743
744        //blocks fetch
745        contextSwitch = true;
746
747        //@todo: dont always add to waitlist
748        //do waitlist
749        cpuWaitList.push_back(tid);
750    }
751}
752
753template <class Impl>
754bool
755FullO3CPU<Impl>::drain(Event *drain_event)
756{
757    drainCount = 0;
758    drainEvent = drain_event;
759    fetch.drain();
760    decode.drain();
761    rename.drain();
762    iew.drain();
763    commit.drain();
764
765    // Wake the CPU and record activity so everything can drain out if
766    // the CPU is currently idle.
767    wakeCPU();
768    activityRec.activity();
769
770    return false;
771}
772
773template <class Impl>
774void
775FullO3CPU<Impl>::resume()
776{
777    if (_status == SwitchedOut)
778        return;
779    fetch.resume();
780    decode.resume();
781    rename.resume();
782    iew.resume();
783    commit.resume();
784
785    if (!tickEvent.scheduled())
786        tickEvent.schedule(curTick);
787    _status = Running;
788}
789
790template <class Impl>
791void
792FullO3CPU<Impl>::signalDrained()
793{
794    if (++drainCount == NumStages) {
795        if (tickEvent.scheduled())
796            tickEvent.squash();
797        _status = Drained;
798        drainEvent->process();
799    }
800    assert(drainCount <= 5);
801}
802
803template <class Impl>
804void
805FullO3CPU<Impl>::switchOut()
806{
807    fetch.switchOut();
808    rename.switchOut();
809    commit.switchOut();
810    instList.clear();
811    while (!removeList.empty()) {
812        removeList.pop();
813    }
814
815    _status = SwitchedOut;
816#if USE_CHECKER
817    if (checker)
818        checker->switchOut();
819#endif
820}
821
822template <class Impl>
823void
824FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
825{
826    // Flush out any old data from the time buffers.
827    for (int i = 0; i < 10; ++i) {
828        timeBuffer.advance();
829        fetchQueue.advance();
830        decodeQueue.advance();
831        renameQueue.advance();
832        iewQueue.advance();
833    }
834
835    activityRec.reset();
836
837    BaseCPU::takeOverFrom(oldCPU);
838
839    fetch.takeOverFrom();
840    decode.takeOverFrom();
841    rename.takeOverFrom();
842    iew.takeOverFrom();
843    commit.takeOverFrom();
844
845    assert(!tickEvent.scheduled());
846
847    // @todo: Figure out how to properly select the tid to put onto
848    // the active threads list.
849    int tid = 0;
850
851    list<unsigned>::iterator isActive = find(
852        activeThreads.begin(), activeThreads.end(), tid);
853
854    if (isActive == activeThreads.end()) {
855        //May Need to Re-code this if the delay variable is the delay
856        //needed for thread to activate
857        DPRINTF(O3CPU, "Adding Thread %i to active threads list\n",
858                tid);
859
860        activeThreads.push_back(tid);
861    }
862
863    // Set all statuses to active, schedule the CPU's tick event.
864    // @todo: Fix up statuses so this is handled properly
865    for (int i = 0; i < threadContexts.size(); ++i) {
866        ThreadContext *tc = threadContexts[i];
867        if (tc->status() == ThreadContext::Active && _status != Running) {
868            _status = Running;
869            tickEvent.schedule(curTick);
870        }
871    }
872    if (!tickEvent.scheduled())
873        tickEvent.schedule(curTick);
874}
875
876template <class Impl>
877uint64_t
878FullO3CPU<Impl>::readIntReg(int reg_idx)
879{
880    return regFile.readIntReg(reg_idx);
881}
882
883template <class Impl>
884FloatReg
885FullO3CPU<Impl>::readFloatReg(int reg_idx, int width)
886{
887    return regFile.readFloatReg(reg_idx, width);
888}
889
890template <class Impl>
891FloatReg
892FullO3CPU<Impl>::readFloatReg(int reg_idx)
893{
894    return regFile.readFloatReg(reg_idx);
895}
896
897template <class Impl>
898FloatRegBits
899FullO3CPU<Impl>::readFloatRegBits(int reg_idx, int width)
900{
901    return regFile.readFloatRegBits(reg_idx, width);
902}
903
904template <class Impl>
905FloatRegBits
906FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
907{
908    return regFile.readFloatRegBits(reg_idx);
909}
910
911template <class Impl>
912void
913FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
914{
915    regFile.setIntReg(reg_idx, val);
916}
917
918template <class Impl>
919void
920FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val, int width)
921{
922    regFile.setFloatReg(reg_idx, val, width);
923}
924
925template <class Impl>
926void
927FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
928{
929    regFile.setFloatReg(reg_idx, val);
930}
931
932template <class Impl>
933void
934FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, int width)
935{
936    regFile.setFloatRegBits(reg_idx, val, width);
937}
938
939template <class Impl>
940void
941FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
942{
943    regFile.setFloatRegBits(reg_idx, val);
944}
945
946template <class Impl>
947uint64_t
948FullO3CPU<Impl>::readArchIntReg(int reg_idx, unsigned tid)
949{
950    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
951
952    return regFile.readIntReg(phys_reg);
953}
954
955template <class Impl>
956float
957FullO3CPU<Impl>::readArchFloatRegSingle(int reg_idx, unsigned tid)
958{
959    int idx = reg_idx + TheISA::FP_Base_DepTag;
960    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
961
962    return regFile.readFloatReg(phys_reg);
963}
964
965template <class Impl>
966double
967FullO3CPU<Impl>::readArchFloatRegDouble(int reg_idx, unsigned tid)
968{
969    int idx = reg_idx + TheISA::FP_Base_DepTag;
970    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
971
972    return regFile.readFloatReg(phys_reg, 64);
973}
974
975template <class Impl>
976uint64_t
977FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, unsigned tid)
978{
979    int idx = reg_idx + TheISA::FP_Base_DepTag;
980    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
981
982    return regFile.readFloatRegBits(phys_reg);
983}
984
985template <class Impl>
986void
987FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, unsigned tid)
988{
989    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
990
991    regFile.setIntReg(phys_reg, val);
992}
993
994template <class Impl>
995void
996FullO3CPU<Impl>::setArchFloatRegSingle(int reg_idx, float val, unsigned tid)
997{
998    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
999
1000    regFile.setFloatReg(phys_reg, val);
1001}
1002
1003template <class Impl>
1004void
1005FullO3CPU<Impl>::setArchFloatRegDouble(int reg_idx, double val, unsigned tid)
1006{
1007    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1008
1009    regFile.setFloatReg(phys_reg, val, 64);
1010}
1011
1012template <class Impl>
1013void
1014FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, unsigned tid)
1015{
1016    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1017
1018    regFile.setFloatRegBits(phys_reg, val);
1019}
1020
1021template <class Impl>
1022uint64_t
1023FullO3CPU<Impl>::readPC(unsigned tid)
1024{
1025    return commit.readPC(tid);
1026}
1027
1028template <class Impl>
1029void
1030FullO3CPU<Impl>::setPC(Addr new_PC,unsigned tid)
1031{
1032    commit.setPC(new_PC, tid);
1033}
1034
1035template <class Impl>
1036uint64_t
1037FullO3CPU<Impl>::readNextPC(unsigned tid)
1038{
1039    return commit.readNextPC(tid);
1040}
1041
1042template <class Impl>
1043void
1044FullO3CPU<Impl>::setNextPC(uint64_t val,unsigned tid)
1045{
1046    commit.setNextPC(val, tid);
1047}
1048
1049#if THE_ISA != ALPHA_ISA
1050template <class Impl>
1051uint64_t
1052FullO3CPU<Impl>::readNextNPC(unsigned tid)
1053{
1054    return commit.readNextNPC(tid);
1055}
1056
1057template <class Impl>
1058void
1059FullO3CPU<Impl>::setNextNNPC(uint64_t val,unsigned tid)
1060{
1061    commit.setNextNPC(val, tid);
1062}
1063#endif
1064
1065template <class Impl>
1066typename FullO3CPU<Impl>::ListIt
1067FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1068{
1069    instList.push_back(inst);
1070
1071    return --(instList.end());
1072}
1073
1074template <class Impl>
1075void
1076FullO3CPU<Impl>::instDone(unsigned tid)
1077{
1078    // Keep an instruction count.
1079    thread[tid]->numInst++;
1080    thread[tid]->numInsts++;
1081    committedInsts[tid]++;
1082    totalCommittedInsts++;
1083
1084    // Check for instruction-count-based events.
1085    comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1086}
1087
1088template <class Impl>
1089void
1090FullO3CPU<Impl>::addToRemoveList(DynInstPtr &inst)
1091{
1092    removeInstsThisCycle = true;
1093
1094    removeList.push(inst->getInstListIt());
1095}
1096
1097template <class Impl>
1098void
1099FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1100{
1101    DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %#x "
1102            "[sn:%lli]\n",
1103            inst->threadNumber, inst->readPC(), inst->seqNum);
1104
1105    removeInstsThisCycle = true;
1106
1107    // Remove the front instruction.
1108    removeList.push(inst->getInstListIt());
1109}
1110
1111template <class Impl>
1112void
1113FullO3CPU<Impl>::removeInstsNotInROB(unsigned tid)
1114{
1115    DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1116            " list.\n", tid);
1117
1118    ListIt end_it;
1119
1120    bool rob_empty = false;
1121
1122    if (instList.empty()) {
1123        return;
1124    } else if (rob.isEmpty(/*tid*/)) {
1125        DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1126        end_it = instList.begin();
1127        rob_empty = true;
1128    } else {
1129        end_it = (rob.readTailInst(tid))->getInstListIt();
1130        DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1131    }
1132
1133    removeInstsThisCycle = true;
1134
1135    ListIt inst_it = instList.end();
1136
1137    inst_it--;
1138
1139    // Walk through the instruction list, removing any instructions
1140    // that were inserted after the given instruction iterator, end_it.
1141    while (inst_it != end_it) {
1142        assert(!instList.empty());
1143
1144        squashInstIt(inst_it, tid);
1145
1146        inst_it--;
1147    }
1148
1149    // If the ROB was empty, then we actually need to remove the first
1150    // instruction as well.
1151    if (rob_empty) {
1152        squashInstIt(inst_it, tid);
1153    }
1154}
1155
1156template <class Impl>
1157void
1158FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num,
1159                                  unsigned tid)
1160{
1161    assert(!instList.empty());
1162
1163    removeInstsThisCycle = true;
1164
1165    ListIt inst_iter = instList.end();
1166
1167    inst_iter--;
1168
1169    DPRINTF(O3CPU, "Deleting instructions from instruction "
1170            "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1171            tid, seq_num, (*inst_iter)->seqNum);
1172
1173    while ((*inst_iter)->seqNum > seq_num) {
1174
1175        bool break_loop = (inst_iter == instList.begin());
1176
1177        squashInstIt(inst_iter, tid);
1178
1179        inst_iter--;
1180
1181        if (break_loop)
1182            break;
1183    }
1184}
1185
1186template <class Impl>
1187inline void
1188FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, const unsigned &tid)
1189{
1190    if ((*instIt)->threadNumber == tid) {
1191        DPRINTF(O3CPU, "Squashing instruction, "
1192                "[tid:%i] [sn:%lli] PC %#x\n",
1193                (*instIt)->threadNumber,
1194                (*instIt)->seqNum,
1195                (*instIt)->readPC());
1196
1197        // Mark it as squashed.
1198        (*instIt)->setSquashed();
1199
1200        // @todo: Formulate a consistent method for deleting
1201        // instructions from the instruction list
1202        // Remove the instruction from the list.
1203        removeList.push(instIt);
1204    }
1205}
1206
1207template <class Impl>
1208void
1209FullO3CPU<Impl>::cleanUpRemovedInsts()
1210{
1211    while (!removeList.empty()) {
1212        DPRINTF(O3CPU, "Removing instruction, "
1213                "[tid:%i] [sn:%lli] PC %#x\n",
1214                (*removeList.front())->threadNumber,
1215                (*removeList.front())->seqNum,
1216                (*removeList.front())->readPC());
1217
1218        instList.erase(removeList.front());
1219
1220        removeList.pop();
1221    }
1222
1223    removeInstsThisCycle = false;
1224}
1225/*
1226template <class Impl>
1227void
1228FullO3CPU<Impl>::removeAllInsts()
1229{
1230    instList.clear();
1231}
1232*/
1233template <class Impl>
1234void
1235FullO3CPU<Impl>::dumpInsts()
1236{
1237    int num = 0;
1238
1239    ListIt inst_list_it = instList.begin();
1240
1241    cprintf("Dumping Instruction List\n");
1242
1243    while (inst_list_it != instList.end()) {
1244        cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1245                "Squashed:%i\n\n",
1246                num, (*inst_list_it)->readPC(), (*inst_list_it)->threadNumber,
1247                (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1248                (*inst_list_it)->isSquashed());
1249        inst_list_it++;
1250        ++num;
1251    }
1252}
1253/*
1254template <class Impl>
1255void
1256FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1257{
1258    iew.wakeDependents(inst);
1259}
1260*/
1261template <class Impl>
1262void
1263FullO3CPU<Impl>::wakeCPU()
1264{
1265    if (activityRec.active() || tickEvent.scheduled()) {
1266        DPRINTF(Activity, "CPU already running.\n");
1267        return;
1268    }
1269
1270    DPRINTF(Activity, "Waking up CPU\n");
1271
1272    idleCycles += (curTick - 1) - lastRunningCycle;
1273
1274    tickEvent.schedule(curTick);
1275}
1276
1277template <class Impl>
1278int
1279FullO3CPU<Impl>::getFreeTid()
1280{
1281    for (int i=0; i < numThreads; i++) {
1282        if (!tids[i]) {
1283            tids[i] = true;
1284            return i;
1285        }
1286    }
1287
1288    return -1;
1289}
1290
1291template <class Impl>
1292void
1293FullO3CPU<Impl>::doContextSwitch()
1294{
1295    if (contextSwitch) {
1296
1297        //ADD CODE TO DEACTIVE THREAD HERE (???)
1298
1299        for (int tid=0; tid < cpuWaitList.size(); tid++) {
1300            activateWhenReady(tid);
1301        }
1302
1303        if (cpuWaitList.size() == 0)
1304            contextSwitch = true;
1305    }
1306}
1307
1308template <class Impl>
1309void
1310FullO3CPU<Impl>::updateThreadPriority()
1311{
1312    if (activeThreads.size() > 1)
1313    {
1314        //DEFAULT TO ROUND ROBIN SCHEME
1315        //e.g. Move highest priority to end of thread list
1316        list<unsigned>::iterator list_begin = activeThreads.begin();
1317        list<unsigned>::iterator list_end   = activeThreads.end();
1318
1319        unsigned high_thread = *list_begin;
1320
1321        activeThreads.erase(list_begin);
1322
1323        activeThreads.push_back(high_thread);
1324    }
1325}
1326
1327// Forward declaration of FullO3CPU.
1328template class FullO3CPU<O3CPUImpl>;
1329