cpu.cc revision 3226:de4981baa276 
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_Switch_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    if (remove)
139        cpu->removeThread(tid);
140}
141
142template <class Impl>
143const char *
144FullO3CPU<Impl>::DeallocateContextEvent::description()
145{
146    return "FullO3CPU \"Deallocate Context\" event";
147}
148
149template <class Impl>
150FullO3CPU<Impl>::FullO3CPU(Params *params)
151    : BaseO3CPU(params),
152      tickEvent(this),
153      removeInstsThisCycle(false),
154      fetch(params),
155      decode(params),
156      rename(params),
157      iew(params),
158      commit(params),
159
160      regFile(params->numPhysIntRegs, params->numPhysFloatRegs),
161
162      freeList(params->numberOfThreads,
163               TheISA::NumIntRegs, params->numPhysIntRegs,
164               TheISA::NumFloatRegs, params->numPhysFloatRegs),
165
166      rob(params->numROBEntries, params->squashWidth,
167          params->smtROBPolicy, params->smtROBThreshold,
168          params->numberOfThreads),
169
170      scoreboard(params->numberOfThreads,
171                 TheISA::NumIntRegs, params->numPhysIntRegs,
172                 TheISA::NumFloatRegs, params->numPhysFloatRegs,
173                 TheISA::NumMiscRegs * number_of_threads,
174                 TheISA::ZeroReg),
175
176      timeBuffer(params->backComSize, params->forwardComSize),
177      fetchQueue(params->backComSize, params->forwardComSize),
178      decodeQueue(params->backComSize, params->forwardComSize),
179      renameQueue(params->backComSize, params->forwardComSize),
180      iewQueue(params->backComSize, params->forwardComSize),
181      activityRec(NumStages,
182                  params->backComSize + params->forwardComSize,
183                  params->activity),
184
185      globalSeqNum(1),
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    if (!deferRegistration) {
196        _status = Running;
197    } else {
198        _status = Idle;
199    }
200
201    checker = NULL;
202
203    if (params->checker) {
204#if USE_CHECKER
205        BaseCPU *temp_checker = params->checker;
206        checker = dynamic_cast<Checker<DynInstPtr> *>(temp_checker);
207        checker->setMemory(mem);
208#if FULL_SYSTEM
209        checker->setSystem(params->system);
210#endif
211#else
212        panic("Checker enabled but not compiled in!");
213#endif // USE_CHECKER
214    }
215
216#if !FULL_SYSTEM
217    thread.resize(number_of_threads);
218    tids.resize(number_of_threads);
219#endif
220
221    // The stages also need their CPU pointer setup.  However this
222    // must be done at the upper level CPU because they have pointers
223    // to the upper level CPU, and not this FullO3CPU.
224
225    // Set up Pointers to the activeThreads list for each stage
226    fetch.setActiveThreads(&activeThreads);
227    decode.setActiveThreads(&activeThreads);
228    rename.setActiveThreads(&activeThreads);
229    iew.setActiveThreads(&activeThreads);
230    commit.setActiveThreads(&activeThreads);
231
232    // Give each of the stages the time buffer they will use.
233    fetch.setTimeBuffer(&timeBuffer);
234    decode.setTimeBuffer(&timeBuffer);
235    rename.setTimeBuffer(&timeBuffer);
236    iew.setTimeBuffer(&timeBuffer);
237    commit.setTimeBuffer(&timeBuffer);
238
239    // Also setup each of the stages' queues.
240    fetch.setFetchQueue(&fetchQueue);
241    decode.setFetchQueue(&fetchQueue);
242    commit.setFetchQueue(&fetchQueue);
243    decode.setDecodeQueue(&decodeQueue);
244    rename.setDecodeQueue(&decodeQueue);
245    rename.setRenameQueue(&renameQueue);
246    iew.setRenameQueue(&renameQueue);
247    iew.setIEWQueue(&iewQueue);
248    commit.setIEWQueue(&iewQueue);
249    commit.setRenameQueue(&renameQueue);
250
251    commit.setIEWStage(&iew);
252    rename.setIEWStage(&iew);
253    rename.setCommitStage(&commit);
254
255#if !FULL_SYSTEM
256    int active_threads = params->workload.size();
257
258    if (active_threads > Impl::MaxThreads) {
259        panic("Workload Size too large. Increase the 'MaxThreads'"
260              "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) or "
261              "edit your workload size.");
262    }
263#else
264    int active_threads = 1;
265#endif
266
267    //Make Sure That this a Valid Architeture
268    assert(params->numPhysIntRegs   >= numThreads * TheISA::NumIntRegs);
269    assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
270
271    rename.setScoreboard(&scoreboard);
272    iew.setScoreboard(&scoreboard);
273
274    // Setup the rename map for whichever stages need it.
275    PhysRegIndex lreg_idx = 0;
276    PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs
277
278    for (int tid=0; tid < numThreads; tid++) {
279        bool bindRegs = (tid <= active_threads - 1);
280
281        commitRenameMap[tid].init(TheISA::NumIntRegs,
282                                  params->numPhysIntRegs,
283                                  lreg_idx,            //Index for Logical. Regs
284
285                                  TheISA::NumFloatRegs,
286                                  params->numPhysFloatRegs,
287                                  freg_idx,            //Index for Float Regs
288
289                                  TheISA::NumMiscRegs,
290
291                                  TheISA::ZeroReg,
292                                  TheISA::ZeroReg,
293
294                                  tid,
295                                  false);
296
297        renameMap[tid].init(TheISA::NumIntRegs,
298                            params->numPhysIntRegs,
299                            lreg_idx,                  //Index for Logical. Regs
300
301                            TheISA::NumFloatRegs,
302                            params->numPhysFloatRegs,
303                            freg_idx,                  //Index for Float Regs
304
305                            TheISA::NumMiscRegs,
306
307                            TheISA::ZeroReg,
308                            TheISA::ZeroReg,
309
310                            tid,
311                            bindRegs);
312
313        activateThreadEvent[tid].init(tid, this);
314        deallocateContextEvent[tid].init(tid, this);
315    }
316
317    rename.setRenameMap(renameMap);
318    commit.setRenameMap(commitRenameMap);
319
320    // Give renameMap & rename stage access to the freeList;
321    for (int i=0; i < numThreads; i++) {
322        renameMap[i].setFreeList(&freeList);
323    }
324    rename.setFreeList(&freeList);
325
326    // Setup the ROB for whichever stages need it.
327    commit.setROB(&rob);
328
329    lastRunningCycle = curTick;
330
331    lastActivatedCycle = -1;
332
333    // Give renameMap & rename stage access to the freeList;
334    //for (int i=0; i < numThreads; i++) {
335        //globalSeqNum[i] = 1;
336        //}
337
338    contextSwitch = false;
339}
340
341template <class Impl>
342FullO3CPU<Impl>::~FullO3CPU()
343{
344}
345
346template <class Impl>
347void
348FullO3CPU<Impl>::fullCPURegStats()
349{
350    BaseO3CPU::regStats();
351
352    // Register any of the O3CPU's stats here.
353    timesIdled
354        .name(name() + ".timesIdled")
355        .desc("Number of times that the entire CPU went into an idle state and"
356              " unscheduled itself")
357        .prereq(timesIdled);
358
359    idleCycles
360        .name(name() + ".idleCycles")
361        .desc("Total number of cycles that the CPU has spent unscheduled due "
362              "to idling")
363        .prereq(idleCycles);
364
365    // Number of Instructions simulated
366    // --------------------------------
367    // Should probably be in Base CPU but need templated
368    // MaxThreads so put in here instead
369    committedInsts
370        .init(numThreads)
371        .name(name() + ".committedInsts")
372        .desc("Number of Instructions Simulated");
373
374    totalCommittedInsts
375        .name(name() + ".committedInsts_total")
376        .desc("Number of Instructions Simulated");
377
378    cpi
379        .name(name() + ".cpi")
380        .desc("CPI: Cycles Per Instruction")
381        .precision(6);
382    cpi = simTicks / committedInsts;
383
384    totalCpi
385        .name(name() + ".cpi_total")
386        .desc("CPI: Total CPI of All Threads")
387        .precision(6);
388    totalCpi = simTicks / totalCommittedInsts;
389
390    ipc
391        .name(name() + ".ipc")
392        .desc("IPC: Instructions Per Cycle")
393        .precision(6);
394    ipc =  committedInsts / simTicks;
395
396    totalIpc
397        .name(name() + ".ipc_total")
398        .desc("IPC: Total IPC of All Threads")
399        .precision(6);
400    totalIpc =  totalCommittedInsts / simTicks;
401
402}
403
404template <class Impl>
405Port *
406FullO3CPU<Impl>::getPort(const std::string &if_name, int idx)
407{
408    if (if_name == "dcache_port")
409        return iew.getDcachePort();
410    else if (if_name == "icache_port")
411        return fetch.getIcachePort();
412    else
413        panic("No Such Port\n");
414}
415
416template <class Impl>
417void
418FullO3CPU<Impl>::tick()
419{
420    DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
421
422    ++numCycles;
423
424//    activity = false;
425
426    //Tick each of the stages
427    fetch.tick();
428
429    decode.tick();
430
431    rename.tick();
432
433    iew.tick();
434
435    commit.tick();
436
437#if !FULL_SYSTEM
438    doContextSwitch();
439#endif
440
441    // Now advance the time buffers
442    timeBuffer.advance();
443
444    fetchQueue.advance();
445    decodeQueue.advance();
446    renameQueue.advance();
447    iewQueue.advance();
448
449    activityRec.advance();
450
451    if (removeInstsThisCycle) {
452        cleanUpRemovedInsts();
453    }
454
455    if (!tickEvent.scheduled()) {
456        if (_status == SwitchedOut ||
457            getState() == SimObject::Drained) {
458            DPRINTF(O3CPU, "Switched out!\n");
459            // increment stat
460            lastRunningCycle = curTick;
461        } else if (!activityRec.active() || _status == Idle) {
462            DPRINTF(O3CPU, "Idle!\n");
463            lastRunningCycle = curTick;
464            timesIdled++;
465        } else {
466            tickEvent.schedule(curTick + cycles(1));
467            DPRINTF(O3CPU, "Scheduling next tick!\n");
468        }
469    }
470
471#if !FULL_SYSTEM
472    updateThreadPriority();
473#endif
474
475}
476
477template <class Impl>
478void
479FullO3CPU<Impl>::init()
480{
481    if (!deferRegistration) {
482        registerThreadContexts();
483    }
484
485    // Set inSyscall so that the CPU doesn't squash when initially
486    // setting up registers.
487    for (int i = 0; i < number_of_threads; ++i)
488        thread[i]->inSyscall = true;
489
490    for (int tid=0; tid < number_of_threads; tid++) {
491#if FULL_SYSTEM
492        ThreadContext *src_tc = threadContexts[tid];
493#else
494        ThreadContext *src_tc = thread[tid]->getTC();
495#endif
496        // Threads start in the Suspended State
497        if (src_tc->status() != ThreadContext::Suspended) {
498            continue;
499        }
500
501#if FULL_SYSTEM
502        TheISA::initCPU(src_tc, src_tc->readCpuId());
503#endif
504    }
505
506    // Clear inSyscall.
507    for (int i = 0; i < number_of_threads; ++i)
508        thread[i]->inSyscall = false;
509
510    // Initialize stages.
511    fetch.initStage();
512    iew.initStage();
513    rename.initStage();
514    commit.initStage();
515
516    commit.setThreads(thread);
517}
518
519template <class Impl>
520void
521FullO3CPU<Impl>::activateThread(unsigned tid)
522{
523    list<unsigned>::iterator isActive = find(
524        activeThreads.begin(), activeThreads.end(), tid);
525
526    DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid);
527
528    if (isActive == activeThreads.end()) {
529        DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
530                tid);
531
532        activeThreads.push_back(tid);
533    }
534}
535
536template <class Impl>
537void
538FullO3CPU<Impl>::deactivateThread(unsigned tid)
539{
540    //Remove From Active List, if Active
541    list<unsigned>::iterator thread_it =
542        find(activeThreads.begin(), activeThreads.end(), tid);
543
544    DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid);
545
546    if (thread_it != activeThreads.end()) {
547        DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
548                tid);
549        activeThreads.erase(thread_it);
550    }
551}
552
553template <class Impl>
554void
555FullO3CPU<Impl>::activateContext(int tid, int delay)
556{
557    // Needs to set each stage to running as well.
558    if (delay){
559        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate "
560                "on cycle %d\n", tid, curTick + cycles(delay));
561        scheduleActivateThreadEvent(tid, delay);
562    } else {
563        activateThread(tid);
564    }
565
566    if (lastActivatedCycle < curTick) {
567        scheduleTickEvent(delay);
568
569        // Be sure to signal that there's some activity so the CPU doesn't
570        // deschedule itself.
571        activityRec.activity();
572        fetch.wakeFromQuiesce();
573
574        lastActivatedCycle = curTick;
575
576        _status = Running;
577    }
578}
579
580template <class Impl>
581bool
582FullO3CPU<Impl>::deallocateContext(int tid, bool remove, int delay)
583{
584    // Schedule removal of thread data from CPU
585    if (delay){
586        DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate "
587                "on cycle %d\n", tid, curTick + cycles(delay));
588        scheduleDeallocateContextEvent(tid, remove, delay);
589        return false;
590    } else {
591        deactivateThread(tid);
592        if (remove)
593            removeThread(tid);
594        return true;
595    }
596}
597
598template <class Impl>
599void
600FullO3CPU<Impl>::suspendContext(int tid)
601{
602    DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
603    bool deallocated = deallocateContext(tid, false, 1);
604    // If this was the last thread then unschedule the tick event.
605    if ((activeThreads.size() == 1 && !deallocated) || activeThreads.size() == 0)
606        unscheduleTickEvent();
607    _status = Idle;
608}
609
610template <class Impl>
611void
612FullO3CPU<Impl>::haltContext(int tid)
613{
614    //For now, this is the same as deallocate
615    DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid);
616    deallocateContext(tid, true, 1);
617}
618
619template <class Impl>
620void
621FullO3CPU<Impl>::insertThread(unsigned tid)
622{
623    DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
624    // Will change now that the PC and thread state is internal to the CPU
625    // and not in the ThreadContext.
626#if FULL_SYSTEM
627    ThreadContext *src_tc = system->threadContexts[tid];
628#else
629    ThreadContext *src_tc = tcBase(tid);
630#endif
631
632    //Bind Int Regs to Rename Map
633    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
634        PhysRegIndex phys_reg = freeList.getIntReg();
635
636        renameMap[tid].setEntry(ireg,phys_reg);
637        scoreboard.setReg(phys_reg);
638    }
639
640    //Bind Float Regs to Rename Map
641    for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
642        PhysRegIndex phys_reg = freeList.getFloatReg();
643
644        renameMap[tid].setEntry(freg,phys_reg);
645        scoreboard.setReg(phys_reg);
646    }
647
648    //Copy Thread Data Into RegFile
649    //this->copyFromTC(tid);
650
651    //Set PC/NPC/NNPC
652    setPC(src_tc->readPC(), tid);
653    setNextPC(src_tc->readNextPC(), tid);
654#if ISA_HAS_DELAY_SLOT
655    setNextNPC(src_tc->readNextNPC(), tid);
656#endif
657
658    src_tc->setStatus(ThreadContext::Active);
659
660    activateContext(tid,1);
661
662    //Reset ROB/IQ/LSQ Entries
663    commit.rob->resetEntries();
664    iew.resetEntries();
665}
666
667template <class Impl>
668void
669FullO3CPU<Impl>::removeThread(unsigned tid)
670{
671    DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
672
673    // Copy Thread Data From RegFile
674    // If thread is suspended, it might be re-allocated
675    //this->copyToTC(tid);
676
677    // Unbind Int Regs from Rename Map
678    for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
679        PhysRegIndex phys_reg = renameMap[tid].lookup(ireg);
680
681        scoreboard.unsetReg(phys_reg);
682        freeList.addReg(phys_reg);
683    }
684
685    // Unbind Float Regs from Rename Map
686    for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
687        PhysRegIndex phys_reg = renameMap[tid].lookup(freg);
688
689        scoreboard.unsetReg(phys_reg);
690        freeList.addReg(phys_reg);
691    }
692
693    // Squash Throughout Pipeline
694    InstSeqNum squash_seq_num = commit.rob->readHeadInst(tid)->seqNum;
695    fetch.squash(0, squash_seq_num, true, tid);
696    decode.squash(tid);
697    rename.squash(squash_seq_num, tid);
698    iew.squash(tid);
699    commit.rob->squash(squash_seq_num, tid);
700
701    assert(iew.ldstQueue.getCount(tid) == 0);
702
703    // Reset ROB/IQ/LSQ Entries
704    if (activeThreads.size() >= 1) {
705        commit.rob->resetEntries();
706        iew.resetEntries();
707    }
708}
709
710
711template <class Impl>
712void
713FullO3CPU<Impl>::activateWhenReady(int tid)
714{
715    DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming"
716            "(e.g. PhysRegs/ROB/IQ/LSQ) \n",
717            tid);
718
719    bool ready = true;
720
721    if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) {
722        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
723                "Phys. Int. Regs.\n",
724                tid);
725        ready = false;
726    } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) {
727        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
728                "Phys. Float. Regs.\n",
729                tid);
730        ready = false;
731    } else if (commit.rob->numFreeEntries() >=
732               commit.rob->entryAmount(activeThreads.size() + 1)) {
733        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
734                "ROB entries.\n",
735                tid);
736        ready = false;
737    } else if (iew.instQueue.numFreeEntries() >=
738               iew.instQueue.entryAmount(activeThreads.size() + 1)) {
739        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
740                "IQ entries.\n",
741                tid);
742        ready = false;
743    } else if (iew.ldstQueue.numFreeEntries() >=
744               iew.ldstQueue.entryAmount(activeThreads.size() + 1)) {
745        DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
746                "LSQ entries.\n",
747                tid);
748        ready = false;
749    }
750
751    if (ready) {
752        insertThread(tid);
753
754        contextSwitch = false;
755
756        cpuWaitList.remove(tid);
757    } else {
758        suspendContext(tid);
759
760        //blocks fetch
761        contextSwitch = true;
762
763        //@todo: dont always add to waitlist
764        //do waitlist
765        cpuWaitList.push_back(tid);
766    }
767}
768
769template <class Impl>
770void
771FullO3CPU<Impl>::serialize(std::ostream &os)
772{
773    SimObject::State so_state = SimObject::getState();
774    SERIALIZE_ENUM(so_state);
775    BaseCPU::serialize(os);
776    nameOut(os, csprintf("%s.tickEvent", name()));
777    tickEvent.serialize(os);
778
779    // Use SimpleThread's ability to checkpoint to make it easier to
780    // write out the registers.  Also make this static so it doesn't
781    // get instantiated multiple times (causes a panic in statistics).
782    static SimpleThread temp;
783
784    for (int i = 0; i < thread.size(); i++) {
785        nameOut(os, csprintf("%s.xc.%i", name(), i));
786        temp.copyTC(thread[i]->getTC());
787        temp.serialize(os);
788    }
789}
790
791template <class Impl>
792void
793FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string &section)
794{
795    SimObject::State so_state;
796    UNSERIALIZE_ENUM(so_state);
797    BaseCPU::unserialize(cp, section);
798    tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
799
800    // Use SimpleThread's ability to checkpoint to make it easier to
801    // read in the registers.  Also make this static so it doesn't
802    // get instantiated multiple times (causes a panic in statistics).
803    static SimpleThread temp;
804
805    for (int i = 0; i < thread.size(); i++) {
806        temp.copyTC(thread[i]->getTC());
807        temp.unserialize(cp, csprintf("%s.xc.%i", section, i));
808        thread[i]->getTC()->copyArchRegs(temp.getTC());
809    }
810}
811
812template <class Impl>
813unsigned int
814FullO3CPU<Impl>::drain(Event *drain_event)
815{
816    DPRINTF(O3CPU, "Switching out\n");
817    drainCount = 0;
818    fetch.drain();
819    decode.drain();
820    rename.drain();
821    iew.drain();
822    commit.drain();
823
824    // Wake the CPU and record activity so everything can drain out if
825    // the CPU was not able to immediately drain.
826    if (getState() != SimObject::Drained) {
827        // A bit of a hack...set the drainEvent after all the drain()
828        // calls have been made, that way if all of the stages drain
829        // immediately, the signalDrained() function knows not to call
830        // process on the drain event.
831        drainEvent = drain_event;
832
833        wakeCPU();
834        activityRec.activity();
835
836        return 1;
837    } else {
838        return 0;
839    }
840}
841
842template <class Impl>
843void
844FullO3CPU<Impl>::resume()
845{
846#if FULL_SYSTEM
847    assert(system->getMemoryMode() == System::Timing);
848#endif
849    fetch.resume();
850    decode.resume();
851    rename.resume();
852    iew.resume();
853    commit.resume();
854
855    changeState(SimObject::Running);
856
857    if (_status == SwitchedOut || _status == Idle)
858        return;
859
860    if (!tickEvent.scheduled())
861        tickEvent.schedule(curTick);
862    _status = Running;
863}
864
865template <class Impl>
866void
867FullO3CPU<Impl>::signalDrained()
868{
869    if (++drainCount == NumStages) {
870        if (tickEvent.scheduled())
871            tickEvent.squash();
872
873        changeState(SimObject::Drained);
874
875        BaseCPU::switchOut();
876
877        if (drainEvent) {
878            drainEvent->process();
879            drainEvent = NULL;
880        }
881    }
882    assert(drainCount <= 5);
883}
884
885template <class Impl>
886void
887FullO3CPU<Impl>::switchOut()
888{
889    fetch.switchOut();
890    rename.switchOut();
891    iew.switchOut();
892    commit.switchOut();
893    instList.clear();
894    while (!removeList.empty()) {
895        removeList.pop();
896    }
897
898    _status = SwitchedOut;
899#if USE_CHECKER
900    if (checker)
901        checker->switchOut();
902#endif
903    if (tickEvent.scheduled())
904        tickEvent.squash();
905}
906
907template <class Impl>
908void
909FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
910{
911    // Flush out any old data from the time buffers.
912    for (int i = 0; i < timeBuffer.getSize(); ++i) {
913        timeBuffer.advance();
914        fetchQueue.advance();
915        decodeQueue.advance();
916        renameQueue.advance();
917        iewQueue.advance();
918    }
919
920    activityRec.reset();
921
922    BaseCPU::takeOverFrom(oldCPU);
923
924    fetch.takeOverFrom();
925    decode.takeOverFrom();
926    rename.takeOverFrom();
927    iew.takeOverFrom();
928    commit.takeOverFrom();
929
930    assert(!tickEvent.scheduled());
931
932    // @todo: Figure out how to properly select the tid to put onto
933    // the active threads list.
934    int tid = 0;
935
936    list<unsigned>::iterator isActive = find(
937        activeThreads.begin(), activeThreads.end(), tid);
938
939    if (isActive == activeThreads.end()) {
940        //May Need to Re-code this if the delay variable is the delay
941        //needed for thread to activate
942        DPRINTF(O3CPU, "Adding Thread %i to active threads list\n",
943                tid);
944
945        activeThreads.push_back(tid);
946    }
947
948    // Set all statuses to active, schedule the CPU's tick event.
949    // @todo: Fix up statuses so this is handled properly
950    for (int i = 0; i < threadContexts.size(); ++i) {
951        ThreadContext *tc = threadContexts[i];
952        if (tc->status() == ThreadContext::Active && _status != Running) {
953            _status = Running;
954            tickEvent.schedule(curTick);
955        }
956    }
957    if (!tickEvent.scheduled())
958        tickEvent.schedule(curTick);
959
960    Port *peer;
961    Port *icachePort = fetch.getIcachePort();
962    if (icachePort->getPeer() == NULL) {
963        peer = oldCPU->getPort("icachePort")->getPeer();
964        icachePort->setPeer(peer);
965    } else {
966        peer = icachePort->getPeer();
967    }
968    peer->setPeer(icachePort);
969
970    Port *dcachePort = iew.getDcachePort();
971    if (dcachePort->getPeer() == NULL) {
972        Port *peer = oldCPU->getPort("dcachePort")->getPeer();
973        dcachePort->setPeer(peer);
974    } else {
975        peer = dcachePort->getPeer();
976    }
977    peer->setPeer(dcachePort);
978}
979
980template <class Impl>
981uint64_t
982FullO3CPU<Impl>::readIntReg(int reg_idx)
983{
984    return regFile.readIntReg(reg_idx);
985}
986
987template <class Impl>
988FloatReg
989FullO3CPU<Impl>::readFloatReg(int reg_idx, int width)
990{
991    return regFile.readFloatReg(reg_idx, width);
992}
993
994template <class Impl>
995FloatReg
996FullO3CPU<Impl>::readFloatReg(int reg_idx)
997{
998    return regFile.readFloatReg(reg_idx);
999}
1000
1001template <class Impl>
1002FloatRegBits
1003FullO3CPU<Impl>::readFloatRegBits(int reg_idx, int width)
1004{
1005    return regFile.readFloatRegBits(reg_idx, width);
1006}
1007
1008template <class Impl>
1009FloatRegBits
1010FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
1011{
1012    return regFile.readFloatRegBits(reg_idx);
1013}
1014
1015template <class Impl>
1016void
1017FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
1018{
1019    regFile.setIntReg(reg_idx, val);
1020}
1021
1022template <class Impl>
1023void
1024FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val, int width)
1025{
1026    regFile.setFloatReg(reg_idx, val, width);
1027}
1028
1029template <class Impl>
1030void
1031FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
1032{
1033    regFile.setFloatReg(reg_idx, val);
1034}
1035
1036template <class Impl>
1037void
1038FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, int width)
1039{
1040    regFile.setFloatRegBits(reg_idx, val, width);
1041}
1042
1043template <class Impl>
1044void
1045FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
1046{
1047    regFile.setFloatRegBits(reg_idx, val);
1048}
1049
1050template <class Impl>
1051uint64_t
1052FullO3CPU<Impl>::readArchIntReg(int reg_idx, unsigned tid)
1053{
1054    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1055
1056    return regFile.readIntReg(phys_reg);
1057}
1058
1059template <class Impl>
1060float
1061FullO3CPU<Impl>::readArchFloatRegSingle(int reg_idx, unsigned tid)
1062{
1063    int idx = reg_idx + TheISA::FP_Base_DepTag;
1064    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1065
1066    return regFile.readFloatReg(phys_reg);
1067}
1068
1069template <class Impl>
1070double
1071FullO3CPU<Impl>::readArchFloatRegDouble(int reg_idx, unsigned tid)
1072{
1073    int idx = reg_idx + TheISA::FP_Base_DepTag;
1074    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1075
1076    return regFile.readFloatReg(phys_reg, 64);
1077}
1078
1079template <class Impl>
1080uint64_t
1081FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, unsigned tid)
1082{
1083    int idx = reg_idx + TheISA::FP_Base_DepTag;
1084    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1085
1086    return regFile.readFloatRegBits(phys_reg);
1087}
1088
1089template <class Impl>
1090void
1091FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, unsigned tid)
1092{
1093    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1094
1095    regFile.setIntReg(phys_reg, val);
1096}
1097
1098template <class Impl>
1099void
1100FullO3CPU<Impl>::setArchFloatRegSingle(int reg_idx, float val, unsigned tid)
1101{
1102    int idx = reg_idx + TheISA::FP_Base_DepTag;
1103    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1104
1105    regFile.setFloatReg(phys_reg, val);
1106}
1107
1108template <class Impl>
1109void
1110FullO3CPU<Impl>::setArchFloatRegDouble(int reg_idx, double val, unsigned tid)
1111{
1112    int idx = reg_idx + TheISA::FP_Base_DepTag;
1113    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1114
1115    regFile.setFloatReg(phys_reg, val, 64);
1116}
1117
1118template <class Impl>
1119void
1120FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, unsigned tid)
1121{
1122    int idx = reg_idx + TheISA::FP_Base_DepTag;
1123    PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1124
1125    regFile.setFloatRegBits(phys_reg, val);
1126}
1127
1128template <class Impl>
1129uint64_t
1130FullO3CPU<Impl>::readPC(unsigned tid)
1131{
1132    return commit.readPC(tid);
1133}
1134
1135template <class Impl>
1136void
1137FullO3CPU<Impl>::setPC(Addr new_PC,unsigned tid)
1138{
1139    commit.setPC(new_PC, tid);
1140}
1141
1142template <class Impl>
1143uint64_t
1144FullO3CPU<Impl>::readNextPC(unsigned tid)
1145{
1146    return commit.readNextPC(tid);
1147}
1148
1149template <class Impl>
1150void
1151FullO3CPU<Impl>::setNextPC(uint64_t val,unsigned tid)
1152{
1153    commit.setNextPC(val, tid);
1154}
1155
1156template <class Impl>
1157uint64_t
1158FullO3CPU<Impl>::readNextNPC(unsigned tid)
1159{
1160    return commit.readNextNPC(tid);
1161}
1162
1163template <class Impl>
1164void
1165FullO3CPU<Impl>::setNextNPC(uint64_t val,unsigned tid)
1166{
1167    commit.setNextNPC(val, tid);
1168}
1169
1170template <class Impl>
1171typename FullO3CPU<Impl>::ListIt
1172FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1173{
1174    instList.push_back(inst);
1175
1176    return --(instList.end());
1177}
1178
1179template <class Impl>
1180void
1181FullO3CPU<Impl>::instDone(unsigned tid)
1182{
1183    // Keep an instruction count.
1184    thread[tid]->numInst++;
1185    thread[tid]->numInsts++;
1186    committedInsts[tid]++;
1187    totalCommittedInsts++;
1188
1189    // Check for instruction-count-based events.
1190    comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1191}
1192
1193template <class Impl>
1194void
1195FullO3CPU<Impl>::addToRemoveList(DynInstPtr &inst)
1196{
1197    removeInstsThisCycle = true;
1198
1199    removeList.push(inst->getInstListIt());
1200}
1201
1202template <class Impl>
1203void
1204FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1205{
1206    DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %#x "
1207            "[sn:%lli]\n",
1208            inst->threadNumber, inst->readPC(), inst->seqNum);
1209
1210    removeInstsThisCycle = true;
1211
1212    // Remove the front instruction.
1213    removeList.push(inst->getInstListIt());
1214}
1215
1216template <class Impl>
1217void
1218FullO3CPU<Impl>::removeInstsNotInROB(unsigned tid,
1219                                     bool squash_delay_slot,
1220                                     const InstSeqNum &delay_slot_seq_num)
1221{
1222    DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1223            " list.\n", tid);
1224
1225    ListIt end_it;
1226
1227    bool rob_empty = false;
1228
1229    if (instList.empty()) {
1230        return;
1231    } else if (rob.isEmpty(/*tid*/)) {
1232        DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1233        end_it = instList.begin();
1234        rob_empty = true;
1235    } else {
1236        end_it = (rob.readTailInst(tid))->getInstListIt();
1237        DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1238    }
1239
1240    removeInstsThisCycle = true;
1241
1242    ListIt inst_it = instList.end();
1243
1244    inst_it--;
1245
1246    // Walk through the instruction list, removing any instructions
1247    // that were inserted after the given instruction iterator, end_it.
1248    while (inst_it != end_it) {
1249        assert(!instList.empty());
1250
1251#if ISA_HAS_DELAY_SLOT
1252        if(!squash_delay_slot &&
1253           delay_slot_seq_num >= (*inst_it)->seqNum) {
1254            break;
1255        }
1256#endif
1257        squashInstIt(inst_it, tid);
1258
1259        inst_it--;
1260    }
1261
1262    // If the ROB was empty, then we actually need to remove the first
1263    // instruction as well.
1264    if (rob_empty) {
1265        squashInstIt(inst_it, tid);
1266    }
1267}
1268
1269template <class Impl>
1270void
1271FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num,
1272                                  unsigned tid)
1273{
1274    assert(!instList.empty());
1275
1276    removeInstsThisCycle = true;
1277
1278    ListIt inst_iter = instList.end();
1279
1280    inst_iter--;
1281
1282    DPRINTF(O3CPU, "Deleting instructions from instruction "
1283            "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1284            tid, seq_num, (*inst_iter)->seqNum);
1285
1286    while ((*inst_iter)->seqNum > seq_num) {
1287
1288        bool break_loop = (inst_iter == instList.begin());
1289
1290        squashInstIt(inst_iter, tid);
1291
1292        inst_iter--;
1293
1294        if (break_loop)
1295            break;
1296    }
1297}
1298
1299template <class Impl>
1300inline void
1301FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, const unsigned &tid)
1302{
1303    if ((*instIt)->threadNumber == tid) {
1304        DPRINTF(O3CPU, "Squashing instruction, "
1305                "[tid:%i] [sn:%lli] PC %#x\n",
1306                (*instIt)->threadNumber,
1307                (*instIt)->seqNum,
1308                (*instIt)->readPC());
1309
1310        // Mark it as squashed.
1311        (*instIt)->setSquashed();
1312
1313        // @todo: Formulate a consistent method for deleting
1314        // instructions from the instruction list
1315        // Remove the instruction from the list.
1316        removeList.push(instIt);
1317    }
1318}
1319
1320template <class Impl>
1321void
1322FullO3CPU<Impl>::cleanUpRemovedInsts()
1323{
1324    while (!removeList.empty()) {
1325        DPRINTF(O3CPU, "Removing instruction, "
1326                "[tid:%i] [sn:%lli] PC %#x\n",
1327                (*removeList.front())->threadNumber,
1328                (*removeList.front())->seqNum,
1329                (*removeList.front())->readPC());
1330
1331        instList.erase(removeList.front());
1332
1333        removeList.pop();
1334    }
1335
1336    removeInstsThisCycle = false;
1337}
1338/*
1339template <class Impl>
1340void
1341FullO3CPU<Impl>::removeAllInsts()
1342{
1343    instList.clear();
1344}
1345*/
1346template <class Impl>
1347void
1348FullO3CPU<Impl>::dumpInsts()
1349{
1350    int num = 0;
1351
1352    ListIt inst_list_it = instList.begin();
1353
1354    cprintf("Dumping Instruction List\n");
1355
1356    while (inst_list_it != instList.end()) {
1357        cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1358                "Squashed:%i\n\n",
1359                num, (*inst_list_it)->readPC(), (*inst_list_it)->threadNumber,
1360                (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1361                (*inst_list_it)->isSquashed());
1362        inst_list_it++;
1363        ++num;
1364    }
1365}
1366/*
1367template <class Impl>
1368void
1369FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1370{
1371    iew.wakeDependents(inst);
1372}
1373*/
1374template <class Impl>
1375void
1376FullO3CPU<Impl>::wakeCPU()
1377{
1378    if (activityRec.active() || tickEvent.scheduled()) {
1379        DPRINTF(Activity, "CPU already running.\n");
1380        return;
1381    }
1382
1383    DPRINTF(Activity, "Waking up CPU\n");
1384
1385    idleCycles += (curTick - 1) - lastRunningCycle;
1386
1387    tickEvent.schedule(curTick);
1388}
1389
1390template <class Impl>
1391int
1392FullO3CPU<Impl>::getFreeTid()
1393{
1394    for (int i=0; i < numThreads; i++) {
1395        if (!tids[i]) {
1396            tids[i] = true;
1397            return i;
1398        }
1399    }
1400
1401    return -1;
1402}
1403
1404template <class Impl>
1405void
1406FullO3CPU<Impl>::doContextSwitch()
1407{
1408    if (contextSwitch) {
1409
1410        //ADD CODE TO DEACTIVE THREAD HERE (???)
1411
1412        for (int tid=0; tid < cpuWaitList.size(); tid++) {
1413            activateWhenReady(tid);
1414        }
1415
1416        if (cpuWaitList.size() == 0)
1417            contextSwitch = true;
1418    }
1419}
1420
1421template <class Impl>
1422void
1423FullO3CPU<Impl>::updateThreadPriority()
1424{
1425    if (activeThreads.size() > 1)
1426    {
1427        //DEFAULT TO ROUND ROBIN SCHEME
1428        //e.g. Move highest priority to end of thread list
1429        list<unsigned>::iterator list_begin = activeThreads.begin();
1430        list<unsigned>::iterator list_end   = activeThreads.end();
1431
1432        unsigned high_thread = *list_begin;
1433
1434        activeThreads.erase(list_begin);
1435
1436        activeThreads.push_back(high_thread);
1437    }
1438}
1439
1440// Forward declaration of FullO3CPU.
1441template class FullO3CPU<O3CPUImpl>;
1442