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