cpu.cc revision 3125:febd811bccc6 
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 "cpu/quiesce_event.hh"
37#include "sim/system.hh"
38#else
39#include "sim/process.hh"
40#endif
41
42#include "cpu/activity.hh"
43#include "cpu/simple_thread.hh"
44#include "cpu/thread_context.hh"
45#include "cpu/o3/isa_specific.hh"
46#include "cpu/o3/cpu.hh"
47
48#include "sim/root.hh"
49#include "sim/stat_control.hh"
50
51#if USE_CHECKER
52#include "cpu/checker/cpu.hh"
53#endif
54
55using namespace std;
56using namespace TheISA;
57
58BaseO3CPU::BaseO3CPU(Params *params)
59    : BaseCPU(params), cpu_id(0)
60{
61}
62
63void
64BaseO3CPU::regStats()
65{
66    BaseCPU::regStats();
67}
68
69template <class Impl>
70FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c)
71    : Event(&mainEventQueue, CPU_Tick_Pri), cpu(c)
72{
73}
74
75template <class Impl>
76void
77FullO3CPU<Impl>::TickEvent::process()
78{
79    cpu->tick();
80}
81
82template <class Impl>
83const char *
84FullO3CPU<Impl>::TickEvent::description()
85{
86    return "FullO3CPU tick event";
87}
88
89template <class Impl>
90FullO3CPU<Impl>::ActivateThreadEvent::ActivateThreadEvent()
91    : Event(&mainEventQueue, CPU_Tick_Pri)
92{
93}
94
95template <class Impl>
96void
97FullO3CPU<Impl>::ActivateThreadEvent::init(int thread_num,
98                                           FullO3CPU<Impl> *thread_cpu)
99{
100    tid = thread_num;
101    cpu = thread_cpu;
102}
103
104template <class Impl>
105void
106FullO3CPU<Impl>::ActivateThreadEvent::process()
107{
108    cpu->activateThread(tid);
109}
110
111template <class Impl>
112const char *
113FullO3CPU<Impl>::ActivateThreadEvent::description()
114{
115    return "FullO3CPU \"Activate Thread\" event";
116}
117
118template <class Impl>
119FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent()
120    : Event(&mainEventQueue, CPU_Tick_Pri)
121{
122}
123
124template <class Impl>
125void
126FullO3CPU<Impl>::DeallocateContextEvent::init(int thread_num,
127                                           FullO3CPU<Impl> *thread_cpu)
128{
129    tid = thread_num;
130    cpu = thread_cpu;
131}
132
133template <class Impl>
134void
135FullO3CPU<Impl>::DeallocateContextEvent::process()
136{
137    cpu->deactivateThread(tid);
138    cpu->removeThread(tid);
139}
140
141template <class Impl>
142const char *
143FullO3CPU<Impl>::DeallocateContextEvent::description()
144{
145    return "FullO3CPU \"Deallocate Context\" event";
146}
147
148template <class Impl>
149FullO3CPU<Impl>::FullO3CPU(Params *params)
150    : BaseO3CPU(params),
151      tickEvent(this),
152      removeInstsThisCycle(false),
153      fetch(params),
154      decode(params),
155      rename(params),
156      iew(params),
157      commit(params),
158
159      regFile(params->numPhysIntRegs, params->numPhysFloatRegs),
160
161      freeList(params->numberOfThreads,
162               TheISA::NumIntRegs, params->numPhysIntRegs,
163               TheISA::NumFloatRegs, params->numPhysFloatRegs),
164
165      rob(params->numROBEntries, params->squashWidth,
166          params->smtROBPolicy, params->smtROBThreshold,
167          params->numberOfThreads),
168
169      scoreboard(params->numberOfThreads,
170                 TheISA::NumIntRegs, params->numPhysIntRegs,
171                 TheISA::NumFloatRegs, params->numPhysFloatRegs,
172                 TheISA::NumMiscRegs * number_of_threads,
173                 TheISA::ZeroReg),
174
175      timeBuffer(params->backComSize, params->forwardComSize),
176      fetchQueue(params->backComSize, params->forwardComSize),
177      decodeQueue(params->backComSize, params->forwardComSize),
178      renameQueue(params->backComSize, params->forwardComSize),
179      iewQueue(params->backComSize, params->forwardComSize),
180      activityRec(NumStages,
181                  params->backComSize + params->forwardComSize,
182                  params->activity),
183
184      globalSeqNum(1),
185#if FULL_SYSTEM
186      system(params->system),
187      physmem(system->physmem),
188#endif // FULL_SYSTEM
189      mem(params->mem),
190      drainCount(0),
191      deferRegistration(params->deferRegistration),
192      numThreads(number_of_threads)
193{
194    _status = Idle;
195
196    checker = NULL;
197
198    if (params->checker) {
199#if USE_CHECKER
200        BaseCPU *temp_checker = params->checker;
201        checker = dynamic_cast<Checker<DynInstPtr> *>(temp_checker);
202        checker->setMemory(mem);
203#if FULL_SYSTEM
204        checker->setSystem(params->system);
205#endif
206#else
207        panic("Checker enabled but not compiled in!");
208#endif // USE_CHECKER
209    }
210
211#if !FULL_SYSTEM
212    thread.resize(number_of_threads);
213    tids.resize(number_of_threads);
214#endif
215
216    // The stages also need their CPU pointer setup.  However this
217    // must be done at the upper level CPU because they have pointers
218    // to the upper level CPU, and not this FullO3CPU.
219
220    // Set up Pointers to the activeThreads list for each stage
221    fetch.setActiveThreads(&activeThreads);
222    decode.setActiveThreads(&activeThreads);
223    rename.setActiveThreads(&activeThreads);
224    iew.setActiveThreads(&activeThreads);
225    commit.setActiveThreads(&activeThreads);
226
227    // Give each of the stages the time buffer they will use.
228    fetch.setTimeBuffer(&timeBuffer);
229    decode.setTimeBuffer(&timeBuffer);
230    rename.setTimeBuffer(&timeBuffer);
231    iew.setTimeBuffer(&timeBuffer);
232    commit.setTimeBuffer(&timeBuffer);
233
234    // Also setup each of the stages' queues.
235    fetch.setFetchQueue(&fetchQueue);
236    decode.setFetchQueue(&fetchQueue);
237    commit.setFetchQueue(&fetchQueue);
238    decode.setDecodeQueue(&decodeQueue);
239    rename.setDecodeQueue(&decodeQueue);
240    rename.setRenameQueue(&renameQueue);
241    iew.setRenameQueue(&renameQueue);
242    iew.setIEWQueue(&iewQueue);
243    commit.setIEWQueue(&iewQueue);
244    commit.setRenameQueue(&renameQueue);
245
246    commit.setIEWStage(&iew);
247    rename.setIEWStage(&iew);
248    rename.setCommitStage(&commit);
249
250#if !FULL_SYSTEM
251    int active_threads = params->workload.size();
252
253    if (active_threads > Impl::MaxThreads) {
254        panic("Workload Size too large. Increase the 'MaxThreads'"
255              "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) or "
256              "edit your workload size.");
257    }
258#else
259    int active_threads = 1;
260#endif
261
262    //Make Sure That this a Valid Architeture
263    assert(params->numPhysIntRegs   >= numThreads * TheISA::NumIntRegs);
264    assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
265
266    rename.setScoreboard(&scoreboard);
267    iew.setScoreboard(&scoreboard);
268
269    // Setup the rename map for whichever stages need it.
270    PhysRegIndex lreg_idx = 0;
271    PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs
272
273    for (int tid=0; tid < numThreads; tid++) {
274        bool bindRegs = (tid <= active_threads - 1);
275
276        commitRenameMap[tid].init(TheISA::NumIntRegs,
277                                  params->numPhysIntRegs,
278                                  lreg_idx,            //Index for Logical. Regs
279
280                                  TheISA::NumFloatRegs,
281                                  params->numPhysFloatRegs,
282                                  freg_idx,            //Index for Float Regs
283
284                                  TheISA::NumMiscRegs,
285
286                                  TheISA::ZeroReg,
287                                  TheISA::ZeroReg,
288
289                                  tid,
290                                  false);
291
292        renameMap[tid].init(TheISA::NumIntRegs,
293                            params->numPhysIntRegs,
294                            lreg_idx,                  //Index for Logical. Regs
295
296                            TheISA::NumFloatRegs,
297                            params->numPhysFloatRegs,
298                            freg_idx,                  //Index for Float Regs
299
300                            TheISA::NumMiscRegs,
301
302                            TheISA::ZeroReg,
303                            TheISA::ZeroReg,
304
305                            tid,
306                            bindRegs);
307    }
308
309    rename.setRenameMap(renameMap);
310    commit.setRenameMap(commitRenameMap);
311
312    // Give renameMap & rename stage access to the freeList;
313    for (int i=0; i < numThreads; i++) {
314        renameMap[i].setFreeList(&freeList);
315    }
316    rename.setFreeList(&freeList);
317
318    // Setup the ROB for whichever stages need it.
319    commit.setROB(&rob);
320
321    lastRunningCycle = curTick;
322
323    lastActivatedCycle = -1;
324
325    // Give renameMap & rename stage access to the freeList;
326    //for (int i=0; i < numThreads; i++) {
327        //globalSeqNum[i] = 1;
328        //}
329
330    contextSwitch = false;
331}
332
333template <class Impl>
334FullO3CPU<Impl>::~FullO3CPU()
335{
336}
337
338template <class Impl>
339void
340FullO3CPU<Impl>::fullCPURegStats()
341{
342    BaseO3CPU::regStats();
343
344    // Register any of the O3CPU's stats here.
345    timesIdled
346        .name(name() + ".timesIdled")
347        .desc("Number of times that the entire CPU went into an idle state and"
348              " unscheduled itself")
349        .prereq(timesIdled);
350
351    idleCycles
352        .name(name() + ".idleCycles")
353        .desc("Total number of cycles that the CPU has spent unscheduled due "
354              "to idling")
355        .prereq(idleCycles);
356
357    // Number of Instructions simulated
358    // --------------------------------
359    // Should probably be in Base CPU but need templated
360    // MaxThreads so put in here instead
361    committedInsts
362        .init(numThreads)
363        .name(name() + ".committedInsts")
364        .desc("Number of Instructions Simulated");
365
366    totalCommittedInsts
367        .name(name() + ".committedInsts_total")
368        .desc("Number of Instructions Simulated");
369
370    cpi
371        .name(name() + ".cpi")
372        .desc("CPI: Cycles Per Instruction")
373        .precision(6);
374    cpi = simTicks / committedInsts;
375
376    totalCpi
377        .name(name() + ".cpi_total")
378        .desc("CPI: Total CPI of All Threads")
379        .precision(6);
380    totalCpi = simTicks / totalCommittedInsts;
381
382    ipc
383        .name(name() + ".ipc")
384        .desc("IPC: Instructions Per Cycle")
385        .precision(6);
386    ipc =  committedInsts / simTicks;
387
388    totalIpc
389        .name(name() + ".ipc_total")
390        .desc("IPC: Total IPC of All Threads")
391        .precision(6);
392    totalIpc =  totalCommittedInsts / simTicks;
393
394}
395
396template <class Impl>
397Port *
398FullO3CPU<Impl>::getPort(const std::string &if_name, int idx)
399{
400    if (if_name == "dcache_port")
401        return iew.getDcachePort();
402    else if (if_name == "icache_port")
403        return fetch.getIcachePort();
404    else
405        panic("No Such Port\n");
406}
407
408template <class Impl>
409void
410FullO3CPU<Impl>::tick()
411{
412    DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
413
414    ++numCycles;
415
416//    activity = false;
417
418    //Tick each of the stages
419    fetch.tick();
420
421    decode.tick();
422
423    rename.tick();
424
425    iew.tick();
426
427    commit.tick();
428
429#if !FULL_SYSTEM
430    doContextSwitch();
431#endif
432
433    // Now advance the time buffers
434    timeBuffer.advance();
435
436    fetchQueue.advance();
437    decodeQueue.advance();
438    renameQueue.advance();
439    iewQueue.advance();
440
441    activityRec.advance();
442
443    if (removeInstsThisCycle) {
444        cleanUpRemovedInsts();
445    }
446
447    if (!tickEvent.scheduled()) {
448        if (_status == SwitchedOut ||
449            getState() == SimObject::Drained) {
450            // increment stat
451            lastRunningCycle = curTick;
452        } else if (!activityRec.active()) {
453            lastRunningCycle = curTick;
454            timesIdled++;
455        } else {
456            tickEvent.schedule(curTick + cycles(1));
457        }
458    }
459
460#if !FULL_SYSTEM
461    updateThreadPriority();
462#endif
463
464}
465
466template <class Impl>
467void
468FullO3CPU<Impl>::init()
469{
470    if (!deferRegistration) {
471        registerThreadContexts();
472    }
473
474    // Set inSyscall so that the CPU doesn't squash when initially
475    // setting up registers.
476    for (int i = 0; i < number_of_threads; ++i)
477        thread[i]->inSyscall = true;
478
479    for (int tid=0; tid < number_of_threads; tid++) {
480#if FULL_SYSTEM
481        ThreadContext *src_tc = threadContexts[tid];
482#else
483        ThreadContext *src_tc = thread[tid]->getTC();
484#endif
485        // Threads start in the Suspended State
486        if (src_tc->status() != ThreadContext::Suspended) {
487            continue;
488        }
489
490#if FULL_SYSTEM
491        TheISA::initCPU(src_tc, src_tc->readCpuId());
492#endif
493    }
494
495    // Clear inSyscall.
496    for (int i = 0; i < number_of_threads; ++i)
497        thread[i]->inSyscall = false;
498
499    // Initialize stages.
500    fetch.initStage();
501    iew.initStage();
502    rename.initStage();
503    commit.initStage();
504
505    commit.setThreads(thread);
506}
507
508template <class Impl>
509void
510FullO3CPU<Impl>::activateThread(unsigned tid)
511{
512    list<unsigned>::iterator isActive = find(
513        activeThreads.begin(), activeThreads.end(), tid);
514
515    if (isActive == activeThreads.end()) {
516        DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
517                tid);
518
519        activeThreads.push_back(tid);
520    }
521}
522
523template <class Impl>
524void
525FullO3CPU<Impl>::deactivateThread(unsigned tid)
526{
527    //Remove From Active List, if Active
528    list<unsigned>::iterator thread_it =
529        find(activeThreads.begin(), activeThreads.end(), tid);
530
531    if (thread_it != activeThreads.end()) {
532        DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
533                tid);
534        activeThreads.erase(thread_it);
535    }
536}
537
538template <class Impl>
539void
540FullO3CPU<Impl>::activateContext(int tid, int delay)
541{
542    // Needs to set each stage to running as well.
543    if (delay){
544        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate "
545                "on cycle %d\n", tid, curTick + cycles(delay));
546        scheduleActivateThreadEvent(tid, delay);
547    } else {
548        activateThread(tid);
549    }
550
551    if(lastActivatedCycle < curTick) {
552        scheduleTickEvent(delay);
553
554        // Be sure to signal that there's some activity so the CPU doesn't
555        // deschedule itself.
556        activityRec.activity();
557        fetch.wakeFromQuiesce();
558
559        lastActivatedCycle = curTick;
560
561        _status = Running;
562    }
563}
564
565template <class Impl>
566void
567FullO3CPU<Impl>::deallocateContext(int tid, int delay)
568{
569    // Schedule removal of thread data from CPU
570    if (delay){
571        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate "
572                "on cycle %d\n", tid, curTick + cycles(delay));
573        scheduleDeallocateContextEvent(tid, delay);
574    } else {
575        deactivateThread(tid);
576        removeThread(tid);
577    }
578}
579
580template <class Impl>
581void
582FullO3CPU<Impl>::suspendContext(int tid)
583{
584    DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
585    deactivateThread(tid);
586    if (activeThreads.size() == 0)
587        unscheduleTickEvent();
588    _status = Idle;
589}
590
591template <class Impl>
592void
593FullO3CPU<Impl>::haltContext(int tid)
594{
595    //For now, this is the same as deallocate
596    DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid);
597    deallocateContext(tid, 1);
598}
599
600template <class Impl>
601void
602FullO3CPU<Impl>::insertThread(unsigned tid)
603{
604    DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
605    // Will change now that the PC and thread state is internal to the CPU
606    // and not in the ThreadContext.
607#if FULL_SYSTEM
608    ThreadContext *src_tc = system->threadContexts[tid];
609#else
610    ThreadContext *src_tc = tcBase(tid);
611#endif
612
613    //Bind Int Regs to Rename Map
614    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
615        PhysRegIndex phys_reg = freeList.getIntReg();
616
617        renameMap[tid].setEntry(ireg,phys_reg);
618        scoreboard.setReg(phys_reg);
619    }
620
621    //Bind Float Regs to Rename Map
622    for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
623        PhysRegIndex phys_reg = freeList.getFloatReg();
624
625        renameMap[tid].setEntry(freg,phys_reg);
626        scoreboard.setReg(phys_reg);
627    }
628
629    //Copy Thread Data Into RegFile
630    //this->copyFromTC(tid);
631
632    //Set PC/NPC/NNPC
633    setPC(src_tc->readPC(), tid);
634    setNextPC(src_tc->readNextPC(), tid);
635#if ISA_HAS_DELAY_SLOT
636    setNextNPC(src_tc->readNextNPC(), tid);
637#endif
638
639    src_tc->setStatus(ThreadContext::Active);
640
641    activateContext(tid,1);
642
643    //Reset ROB/IQ/LSQ Entries
644    commit.rob->resetEntries();
645    iew.resetEntries();
646}
647
648template <class Impl>
649void
650FullO3CPU<Impl>::removeThread(unsigned tid)
651{
652    DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
653
654    // Copy Thread Data From RegFile
655    // If thread is suspended, it might be re-allocated
656    //this->copyToTC(tid);
657
658    // Unbind Int Regs from Rename Map
659    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
660        PhysRegIndex phys_reg = renameMap[tid].lookup(ireg);
661
662        scoreboard.unsetReg(phys_reg);
663        freeList.addReg(phys_reg);
664    }
665
666    // Unbind Float Regs from Rename Map
667    for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
668        PhysRegIndex phys_reg = renameMap[tid].lookup(freg);
669
670        scoreboard.unsetReg(phys_reg);
671        freeList.addReg(phys_reg);
672    }
673
674    // Squash Throughout Pipeline
675    InstSeqNum squash_seq_num = commit.rob->readHeadInst(tid)->seqNum;
676    fetch.squash(0, squash_seq_num, true, tid);
677    decode.squash(tid);
678    rename.squash(squash_seq_num, tid);
679    iew.squash(tid);
680    commit.rob->squash(squash_seq_num, tid);
681
682    assert(iew.ldstQueue.getCount(tid) == 0);
683
684    // Reset ROB/IQ/LSQ Entries
685    if (activeThreads.size() >= 1) {
686        commit.rob->resetEntries();
687        iew.resetEntries();
688    }
689}
690
691
692template <class Impl>
693void
694FullO3CPU<Impl>::activateWhenReady(int tid)
695{
696    DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming"
697            "(e.g. PhysRegs/ROB/IQ/LSQ) \n",
698            tid);
699
700    bool ready = true;
701
702    if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) {
703        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
704                "Phys. Int. Regs.\n",
705                tid);
706        ready = false;
707    } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) {
708        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
709                "Phys. Float. Regs.\n",
710                tid);
711        ready = false;
712    } else if (commit.rob->numFreeEntries() >=
713               commit.rob->entryAmount(activeThreads.size() + 1)) {
714        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
715                "ROB entries.\n",
716                tid);
717        ready = false;
718    } else if (iew.instQueue.numFreeEntries() >=
719               iew.instQueue.entryAmount(activeThreads.size() + 1)) {
720        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
721                "IQ entries.\n",
722                tid);
723        ready = false;
724    } else if (iew.ldstQueue.numFreeEntries() >=
725               iew.ldstQueue.entryAmount(activeThreads.size() + 1)) {
726        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
727                "LSQ entries.\n",
728                tid);
729        ready = false;
730    }
731
732    if (ready) {
733        insertThread(tid);
734
735        contextSwitch = false;
736
737        cpuWaitList.remove(tid);
738    } else {
739        suspendContext(tid);
740
741        //blocks fetch
742        contextSwitch = true;
743
744        //@todo: dont always add to waitlist
745        //do waitlist
746        cpuWaitList.push_back(tid);
747    }
748}
749
750template <class Impl>
751void
752FullO3CPU<Impl>::serialize(std::ostream &os)
753{
754    SimObject::State so_state = SimObject::getState();
755    SERIALIZE_ENUM(so_state);
756    BaseCPU::serialize(os);
757    nameOut(os, csprintf("%s.tickEvent", name()));
758    tickEvent.serialize(os);
759
760    // Use SimpleThread's ability to checkpoint to make it easier to
761    // write out the registers.  Also make this static so it doesn't
762    // get instantiated multiple times (causes a panic in statistics).
763    static SimpleThread temp;
764
765    for (int i = 0; i < thread.size(); i++) {
766        nameOut(os, csprintf("%s.xc.%i", name(), i));
767        temp.copyTC(thread[i]->getTC());
768        temp.serialize(os);
769    }
770}
771
772template <class Impl>
773void
774FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string &section)
775{
776    SimObject::State so_state;
777    UNSERIALIZE_ENUM(so_state);
778    BaseCPU::unserialize(cp, section);
779    tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
780
781    // Use SimpleThread's ability to checkpoint to make it easier to
782    // read in the registers.  Also make this static so it doesn't
783    // get instantiated multiple times (causes a panic in statistics).
784    static SimpleThread temp;
785
786    for (int i = 0; i < thread.size(); i++) {
787        temp.copyTC(thread[i]->getTC());
788        temp.unserialize(cp, csprintf("%s.xc.%i", section, i));
789        thread[i]->getTC()->copyArchRegs(temp.getTC());
790    }
791}
792
793template <class Impl>
794unsigned int
795FullO3CPU<Impl>::drain(Event *drain_event)
796{
797    DPRINTF(O3CPU, "Switching out\n");
798    BaseCPU::switchOut(_sampler);
799    drainCount = 0;
800    fetch.drain();
801    decode.drain();
802    rename.drain();
803    iew.drain();
804    commit.drain();
805
806    // Wake the CPU and record activity so everything can drain out if
807    // the CPU was not able to immediately drain.
808    if (getState() != SimObject::Drained) {
809        // A bit of a hack...set the drainEvent after all the drain()
810        // calls have been made, that way if all of the stages drain
811        // immediately, the signalDrained() function knows not to call
812        // process on the drain event.
813        drainEvent = drain_event;
814
815        wakeCPU();
816        activityRec.activity();
817
818        return 1;
819    } else {
820        return 0;
821    }
822}
823
824template <class Impl>
825void
826FullO3CPU<Impl>::resume()
827{
828    assert(system->getMemoryMode() == System::Timing);
829    fetch.resume();
830    decode.resume();
831    rename.resume();
832    iew.resume();
833    commit.resume();
834
835    changeState(SimObject::Running);
836
837    if (_status == SwitchedOut || _status == Idle)
838        return;
839
840    if (!tickEvent.scheduled())
841        tickEvent.schedule(curTick);
842    _status = Running;
843}
844
845template <class Impl>
846void
847FullO3CPU<Impl>::signalDrained()
848{
849    if (++drainCount == NumStages) {
850        if (tickEvent.scheduled())
851            tickEvent.squash();
852
853        changeState(SimObject::Drained);
854
855        if (drainEvent) {
856            drainEvent->process();
857            drainEvent = NULL;
858        }
859    }
860    assert(drainCount <= 5);
861}
862
863template <class Impl>
864void
865FullO3CPU<Impl>::switchOut()
866{
867    fetch.switchOut();
868    rename.switchOut();
869    iew.switchOut();
870    commit.switchOut();
871    instList.clear();
872    while (!removeList.empty()) {
873        removeList.pop();
874    }
875
876    _status = SwitchedOut;
877#if USE_CHECKER
878    if (checker)
879        checker->switchOut();
880#endif
881}
882
883template <class Impl>
884void
885FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
886{
887    // Flush out any old data from the time buffers.
888    for (int i = 0; i < timeBuffer.getSize(); ++i) {
889        timeBuffer.advance();
890        fetchQueue.advance();
891        decodeQueue.advance();
892        renameQueue.advance();
893        iewQueue.advance();
894    }
895
896    activityRec.reset();
897
898    BaseCPU::takeOverFrom(oldCPU);
899
900    fetch.takeOverFrom();
901    decode.takeOverFrom();
902    rename.takeOverFrom();
903    iew.takeOverFrom();
904    commit.takeOverFrom();
905
906    assert(!tickEvent.scheduled());
907
908    // @todo: Figure out how to properly select the tid to put onto
909    // the active threads list.
910    int tid = 0;
911
912    list<unsigned>::iterator isActive = find(
913        activeThreads.begin(), activeThreads.end(), tid);
914
915    if (isActive == activeThreads.end()) {
916        //May Need to Re-code this if the delay variable is the delay
917        //needed for thread to activate
918        DPRINTF(O3CPU, "Adding Thread %i to active threads list\n",
919                tid);
920
921        activeThreads.push_back(tid);
922    }
923
924    // Set all statuses to active, schedule the CPU's tick event.
925    // @todo: Fix up statuses so this is handled properly
926    for (int i = 0; i < threadContexts.size(); ++i) {
927        ThreadContext *tc = threadContexts[i];
928        if (tc->status() == ThreadContext::Active && _status != Running) {
929            _status = Running;
930            tickEvent.schedule(curTick);
931        }
932    }
933    if (!tickEvent.scheduled())
934        tickEvent.schedule(curTick);
935}
936
937template <class Impl>
938void
939FullO3CPU<Impl>::serialize(std::ostream &os)
940{
941    BaseCPU::serialize(os);
942    nameOut(os, csprintf("%s.tickEvent", name()));
943    tickEvent.serialize(os);
944
945    // Use SimpleThread's ability to checkpoint to make it easier to
946    // write out the registers.  Also make this static so it doesn't
947    // get instantiated multiple times (causes a panic in statistics).
948    static CPUExecContext temp;
949
950    for (int i = 0; i < thread.size(); i++) {
951        nameOut(os, csprintf("%s.xc.%i", name(), i));
952        temp.copyXC(thread[i]->getXCProxy());
953        temp.serialize(os);
954    }
955}
956
957template <class Impl>
958void
959FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string &section)
960{
961    BaseCPU::unserialize(cp, section);
962    tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
963
964    // Use SimpleThread's ability to checkpoint to make it easier to
965    // read in the registers.  Also make this static so it doesn't
966    // get instantiated multiple times (causes a panic in statistics).
967    static CPUExecContext temp;
968
969    for (int i = 0; i < thread.size(); i++) {
970        temp.copyXC(thread[i]->getXCProxy());
971        temp.unserialize(cp, csprintf("%s.xc.%i", section, i));
972        thread[i]->getXCProxy()->copyArchRegs(temp.getProxy());
973    }
974}
975
976template <class Impl>
977uint64_t
978FullO3CPU<Impl>::readIntReg(int reg_idx)
979{
980    return regFile.readIntReg(reg_idx);
981}
982
983template <class Impl>
984FloatReg
985FullO3CPU<Impl>::readFloatReg(int reg_idx, int width)
986{
987    return regFile.readFloatReg(reg_idx, width);
988}
989
990template <class Impl>
991FloatReg
992FullO3CPU<Impl>::readFloatReg(int reg_idx)
993{
994    return regFile.readFloatReg(reg_idx);
995}
996
997template <class Impl>
998FloatRegBits
999FullO3CPU<Impl>::readFloatRegBits(int reg_idx, int width)
1000{
1001    return regFile.readFloatRegBits(reg_idx, width);
1002}
1003
1004template <class Impl>
1005FloatRegBits
1006FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
1007{
1008    return regFile.readFloatRegBits(reg_idx);
1009}
1010
1011template <class Impl>
1012void
1013FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
1014{
1015    regFile.setIntReg(reg_idx, val);
1016}
1017
1018template <class Impl>
1019void
1020FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val, int width)
1021{
1022    regFile.setFloatReg(reg_idx, val, width);
1023}
1024
1025template <class Impl>
1026void
1027FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
1028{
1029    regFile.setFloatReg(reg_idx, val);
1030}
1031
1032template <class Impl>
1033void
1034FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, int width)
1035{
1036    regFile.setFloatRegBits(reg_idx, val, width);
1037}
1038
1039template <class Impl>
1040void
1041FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
1042{
1043    regFile.setFloatRegBits(reg_idx, val);
1044}
1045
1046template <class Impl>
1047uint64_t
1048FullO3CPU<Impl>::readArchIntReg(int reg_idx, unsigned tid)
1049{
1050    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1051
1052    return regFile.readIntReg(phys_reg);
1053}
1054
1055template <class Impl>
1056float
1057FullO3CPU<Impl>::readArchFloatRegSingle(int reg_idx, unsigned tid)
1058{
1059    int idx = reg_idx + TheISA::FP_Base_DepTag;
1060    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1061
1062    return regFile.readFloatReg(phys_reg);
1063}
1064
1065template <class Impl>
1066double
1067FullO3CPU<Impl>::readArchFloatRegDouble(int reg_idx, unsigned tid)
1068{
1069    int idx = reg_idx + TheISA::FP_Base_DepTag;
1070    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1071
1072    return regFile.readFloatReg(phys_reg, 64);
1073}
1074
1075template <class Impl>
1076uint64_t
1077FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, unsigned tid)
1078{
1079    int idx = reg_idx + TheISA::FP_Base_DepTag;
1080    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1081
1082    return regFile.readFloatRegBits(phys_reg);
1083}
1084
1085template <class Impl>
1086void
1087FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, unsigned tid)
1088{
1089    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1090
1091    regFile.setIntReg(phys_reg, val);
1092}
1093
1094template <class Impl>
1095void
1096FullO3CPU<Impl>::setArchFloatRegSingle(int reg_idx, float val, unsigned tid)
1097{
1098    int idx = reg_idx + TheISA::FP_Base_DepTag;
1099    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1100
1101    regFile.setFloatReg(phys_reg, val);
1102}
1103
1104template <class Impl>
1105void
1106FullO3CPU<Impl>::setArchFloatRegDouble(int reg_idx, double val, unsigned tid)
1107{
1108    int idx = reg_idx + TheISA::FP_Base_DepTag;
1109    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1110
1111    regFile.setFloatReg(phys_reg, val, 64);
1112}
1113
1114template <class Impl>
1115void
1116FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, unsigned tid)
1117{
1118    int idx = reg_idx + TheISA::FP_Base_DepTag;
1119    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1120
1121    regFile.setFloatRegBits(phys_reg, val);
1122}
1123
1124template <class Impl>
1125uint64_t
1126FullO3CPU<Impl>::readPC(unsigned tid)
1127{
1128    return commit.readPC(tid);
1129}
1130
1131template <class Impl>
1132void
1133FullO3CPU<Impl>::setPC(Addr new_PC,unsigned tid)
1134{
1135    commit.setPC(new_PC, tid);
1136}
1137
1138template <class Impl>
1139uint64_t
1140FullO3CPU<Impl>::readNextPC(unsigned tid)
1141{
1142    return commit.readNextPC(tid);
1143}
1144
1145template <class Impl>
1146void
1147FullO3CPU<Impl>::setNextPC(uint64_t val,unsigned tid)
1148{
1149    commit.setNextPC(val, tid);
1150}
1151
1152template <class Impl>
1153uint64_t
1154FullO3CPU<Impl>::readNextNPC(unsigned tid)
1155{
1156    return commit.readNextNPC(tid);
1157}
1158
1159template <class Impl>
1160void
1161FullO3CPU<Impl>::setNextNPC(uint64_t val,unsigned tid)
1162{
1163    commit.setNextNPC(val, tid);
1164}
1165
1166template <class Impl>
1167typename FullO3CPU<Impl>::ListIt
1168FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1169{
1170    instList.push_back(inst);
1171
1172    return --(instList.end());
1173}
1174
1175template <class Impl>
1176void
1177FullO3CPU<Impl>::instDone(unsigned tid)
1178{
1179    // Keep an instruction count.
1180    thread[tid]->numInst++;
1181    thread[tid]->numInsts++;
1182    committedInsts[tid]++;
1183    totalCommittedInsts++;
1184
1185    // Check for instruction-count-based events.
1186    comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1187}
1188
1189template <class Impl>
1190void
1191FullO3CPU<Impl>::addToRemoveList(DynInstPtr &inst)
1192{
1193    removeInstsThisCycle = true;
1194
1195    removeList.push(inst->getInstListIt());
1196}
1197
1198template <class Impl>
1199void
1200FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1201{
1202    DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %#x "
1203            "[sn:%lli]\n",
1204            inst->threadNumber, inst->readPC(), inst->seqNum);
1205
1206    removeInstsThisCycle = true;
1207
1208    // Remove the front instruction.
1209    removeList.push(inst->getInstListIt());
1210}
1211
1212template <class Impl>
1213void
1214FullO3CPU<Impl>::removeInstsNotInROB(unsigned tid,
1215                                     bool squash_delay_slot,
1216                                     const InstSeqNum &delay_slot_seq_num)
1217{
1218    DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1219            " list.\n", tid);
1220
1221    ListIt end_it;
1222
1223    bool rob_empty = false;
1224
1225    if (instList.empty()) {
1226        return;
1227    } else if (rob.isEmpty(/*tid*/)) {
1228        DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1229        end_it = instList.begin();
1230        rob_empty = true;
1231    } else {
1232        end_it = (rob.readTailInst(tid))->getInstListIt();
1233        DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1234    }
1235
1236    removeInstsThisCycle = true;
1237
1238    ListIt inst_it = instList.end();
1239
1240    inst_it--;
1241
1242    // Walk through the instruction list, removing any instructions
1243    // that were inserted after the given instruction iterator, end_it.
1244    while (inst_it != end_it) {
1245        assert(!instList.empty());
1246
1247#if ISA_HAS_DELAY_SLOT
1248        if(!squash_delay_slot &&
1249           delay_slot_seq_num >= (*inst_it)->seqNum) {
1250            break;
1251        }
1252#endif
1253        squashInstIt(inst_it, tid);
1254
1255        inst_it--;
1256    }
1257
1258    // If the ROB was empty, then we actually need to remove the first
1259    // instruction as well.
1260    if (rob_empty) {
1261        squashInstIt(inst_it, tid);
1262    }
1263}
1264
1265template <class Impl>
1266void
1267FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num,
1268                                  unsigned tid)
1269{
1270    assert(!instList.empty());
1271
1272    removeInstsThisCycle = true;
1273
1274    ListIt inst_iter = instList.end();
1275
1276    inst_iter--;
1277
1278    DPRINTF(O3CPU, "Deleting instructions from instruction "
1279            "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1280            tid, seq_num, (*inst_iter)->seqNum);
1281
1282    while ((*inst_iter)->seqNum > seq_num) {
1283
1284        bool break_loop = (inst_iter == instList.begin());
1285
1286        squashInstIt(inst_iter, tid);
1287
1288        inst_iter--;
1289
1290        if (break_loop)
1291            break;
1292    }
1293}
1294
1295template <class Impl>
1296inline void
1297FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, const unsigned &tid)
1298{
1299    if ((*instIt)->threadNumber == tid) {
1300        DPRINTF(O3CPU, "Squashing instruction, "
1301                "[tid:%i] [sn:%lli] PC %#x\n",
1302                (*instIt)->threadNumber,
1303                (*instIt)->seqNum,
1304                (*instIt)->readPC());
1305
1306        // Mark it as squashed.
1307        (*instIt)->setSquashed();
1308
1309        // @todo: Formulate a consistent method for deleting
1310        // instructions from the instruction list
1311        // Remove the instruction from the list.
1312        removeList.push(instIt);
1313    }
1314}
1315
1316template <class Impl>
1317void
1318FullO3CPU<Impl>::cleanUpRemovedInsts()
1319{
1320    while (!removeList.empty()) {
1321        DPRINTF(O3CPU, "Removing instruction, "
1322                "[tid:%i] [sn:%lli] PC %#x\n",
1323                (*removeList.front())->threadNumber,
1324                (*removeList.front())->seqNum,
1325                (*removeList.front())->readPC());
1326
1327        instList.erase(removeList.front());
1328
1329        removeList.pop();
1330    }
1331
1332    removeInstsThisCycle = false;
1333}
1334/*
1335template <class Impl>
1336void
1337FullO3CPU<Impl>::removeAllInsts()
1338{
1339    instList.clear();
1340}
1341*/
1342template <class Impl>
1343void
1344FullO3CPU<Impl>::dumpInsts()
1345{
1346    int num = 0;
1347
1348    ListIt inst_list_it = instList.begin();
1349
1350    cprintf("Dumping Instruction List\n");
1351
1352    while (inst_list_it != instList.end()) {
1353        cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1354                "Squashed:%i\n\n",
1355                num, (*inst_list_it)->readPC(), (*inst_list_it)->threadNumber,
1356                (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1357                (*inst_list_it)->isSquashed());
1358        inst_list_it++;
1359        ++num;
1360    }
1361}
1362/*
1363template <class Impl>
1364void
1365FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1366{
1367    iew.wakeDependents(inst);
1368}
1369*/
1370template <class Impl>
1371void
1372FullO3CPU<Impl>::wakeCPU()
1373{
1374    if (activityRec.active() || tickEvent.scheduled()) {
1375        DPRINTF(Activity, "CPU already running.\n");
1376        return;
1377    }
1378
1379    DPRINTF(Activity, "Waking up CPU\n");
1380
1381    idleCycles += (curTick - 1) - lastRunningCycle;
1382
1383    tickEvent.schedule(curTick);
1384}
1385
1386template <class Impl>
1387int
1388FullO3CPU<Impl>::getFreeTid()
1389{
1390    for (int i=0; i < numThreads; i++) {
1391        if (!tids[i]) {
1392            tids[i] = true;
1393            return i;
1394        }
1395    }
1396
1397    return -1;
1398}
1399
1400template <class Impl>
1401void
1402FullO3CPU<Impl>::doContextSwitch()
1403{
1404    if (contextSwitch) {
1405
1406        //ADD CODE TO DEACTIVE THREAD HERE (???)
1407
1408        for (int tid=0; tid < cpuWaitList.size(); tid++) {
1409            activateWhenReady(tid);
1410        }
1411
1412        if (cpuWaitList.size() == 0)
1413            contextSwitch = true;
1414    }
1415}
1416
1417template <class Impl>
1418void
1419FullO3CPU<Impl>::updateThreadPriority()
1420{
1421    if (activeThreads.size() > 1)
1422    {
1423        //DEFAULT TO ROUND ROBIN SCHEME
1424        //e.g. Move highest priority to end of thread list
1425        list<unsigned>::iterator list_begin = activeThreads.begin();
1426        list<unsigned>::iterator list_end   = activeThreads.end();
1427
1428        unsigned high_thread = *list_begin;
1429
1430        activeThreads.erase(list_begin);
1431
1432        activeThreads.push_back(high_thread);
1433    }
1434}
1435
1436// Forward declaration of FullO3CPU.
1437template class FullO3CPU<O3CPUImpl>;
1438