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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#include "cpu/activity.hh"
36#include "cpu/simple_thread.hh"
37#include "cpu/thread_context.hh"
38#include "cpu/o3/isa_specific.hh"
39#include "cpu/o3/cpu.hh"
40#include "enums/MemoryMode.hh"
41#include "sim/core.hh"
42#include "sim/stat_control.hh"
43
44#if FULL_SYSTEM
45#include "cpu/quiesce_event.hh"
46#include "sim/system.hh"
47#else
48#include "sim/process.hh"
49#endif
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";
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\"";
116}
117
118template <class Impl>
119FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent()
120 : Event(&mainEventQueue, CPU_Tick_Pri), tid(0), remove(false), cpu(NULL)
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 remove = false;
132}
133
134template <class Impl>
135void
136FullO3CPU<Impl>::DeallocateContextEvent::process()
137{
138 cpu->deactivateThread(tid);
139 if (remove)
140 cpu->removeThread(tid);
141}
142
143template <class Impl>
144const char *
145FullO3CPU<Impl>::DeallocateContextEvent::description()
146{
147 return "FullO3CPU \"Deallocate Context\"";
148}
149
150template <class Impl>
151FullO3CPU<Impl>::FullO3CPU(O3CPU *o3_cpu, Params *params)
152 : BaseO3CPU(params),
153 itb(params->itb),
154 dtb(params->dtb),
155 tickEvent(this),
156 removeInstsThisCycle(false),
157 fetch(o3_cpu, params),
158 decode(o3_cpu, params),
159 rename(o3_cpu, params),
160 iew(o3_cpu, params),
161 commit(o3_cpu, params),
162
163 regFile(o3_cpu, params->numPhysIntRegs,
164 params->numPhysFloatRegs),
165
166 freeList(params->numberOfThreads,
167 TheISA::NumIntRegs, params->numPhysIntRegs,
168 TheISA::NumFloatRegs, params->numPhysFloatRegs),
169
170 rob(o3_cpu,
171 params->numROBEntries, params->squashWidth,
172 params->smtROBPolicy, params->smtROBThreshold,
173 params->numberOfThreads),
174
175 scoreboard(params->numberOfThreads,
176 TheISA::NumIntRegs, params->numPhysIntRegs,
177 TheISA::NumFloatRegs, params->numPhysFloatRegs,
178 TheISA::NumMiscRegs * number_of_threads,
179 TheISA::ZeroReg),
180
181 timeBuffer(params->backComSize, params->forwardComSize),
182 fetchQueue(params->backComSize, params->forwardComSize),
183 decodeQueue(params->backComSize, params->forwardComSize),
184 renameQueue(params->backComSize, params->forwardComSize),
185 iewQueue(params->backComSize, params->forwardComSize),
186 activityRec(NumStages,
187 params->backComSize + params->forwardComSize,
188 params->activity),
189
190 globalSeqNum(1),
191#if FULL_SYSTEM
192 system(params->system),
193 physmem(system->physmem),
194#endif // FULL_SYSTEM
195 drainCount(0),
196 deferRegistration(params->deferRegistration),
197 numThreads(number_of_threads)
198{
199 if (!deferRegistration) {
200 _status = Running;
201 } else {
202 _status = Idle;
203 }
204
205#if USE_CHECKER
206 if (params->checker) {
207 BaseCPU *temp_checker = params->checker;
208 checker = dynamic_cast<Checker<DynInstPtr> *>(temp_checker);
209#if FULL_SYSTEM
210 checker->setSystem(params->system);
211#endif
212 } else {
213 checker = NULL;
214 }
215#endif // USE_CHECKER
216
217#if !FULL_SYSTEM
218 thread.resize(number_of_threads);
219 tids.resize(number_of_threads);
220#endif
221
222 // The stages also need their CPU pointer setup. However this
223 // must be done at the upper level CPU because they have pointers
224 // to the upper level CPU, and not this FullO3CPU.
225
226 // Set up Pointers to the activeThreads list for each stage
227 fetch.setActiveThreads(&activeThreads);
228 decode.setActiveThreads(&activeThreads);
229 rename.setActiveThreads(&activeThreads);
230 iew.setActiveThreads(&activeThreads);
231 commit.setActiveThreads(&activeThreads);
232
233 // Give each of the stages the time buffer they will use.
234 fetch.setTimeBuffer(&timeBuffer);
235 decode.setTimeBuffer(&timeBuffer);
236 rename.setTimeBuffer(&timeBuffer);
237 iew.setTimeBuffer(&timeBuffer);
238 commit.setTimeBuffer(&timeBuffer);
239
240 // Also setup each of the stages' queues.
241 fetch.setFetchQueue(&fetchQueue);
242 decode.setFetchQueue(&fetchQueue);
243 commit.setFetchQueue(&fetchQueue);
244 decode.setDecodeQueue(&decodeQueue);
245 rename.setDecodeQueue(&decodeQueue);
246 rename.setRenameQueue(&renameQueue);
247 iew.setRenameQueue(&renameQueue);
248 iew.setIEWQueue(&iewQueue);
249 commit.setIEWQueue(&iewQueue);
250 commit.setRenameQueue(&renameQueue);
251
252 commit.setIEWStage(&iew);
253 rename.setIEWStage(&iew);
254 rename.setCommitStage(&commit);
255
256#if !FULL_SYSTEM
257 int active_threads = params->workload.size();
258
259 if (active_threads > Impl::MaxThreads) {
260 panic("Workload Size too large. Increase the 'MaxThreads'"
261 "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) or "
262 "edit your workload size.");
263 }
264#else
265 int active_threads = 1;
266#endif
267
268 //Make Sure That this a Valid Architeture
269 assert(params->numPhysIntRegs >= numThreads * TheISA::NumIntRegs);
270 assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
271
272 rename.setScoreboard(&scoreboard);
273 iew.setScoreboard(&scoreboard);
274
275 // Setup the rename map for whichever stages need it.
276 PhysRegIndex lreg_idx = 0;
277 PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs
278
279 for (int tid=0; tid < numThreads; tid++) {
280 bool bindRegs = (tid <= active_threads - 1);
281
282 commitRenameMap[tid].init(TheISA::NumIntRegs,
283 params->numPhysIntRegs,
284 lreg_idx, //Index for Logical. Regs
285
286 TheISA::NumFloatRegs,
287 params->numPhysFloatRegs,
288 freg_idx, //Index for Float Regs
289
290 TheISA::NumMiscRegs,
291
292 TheISA::ZeroReg,
293 TheISA::ZeroReg,
294
295 tid,
296 false);
297
298 renameMap[tid].init(TheISA::NumIntRegs,
299 params->numPhysIntRegs,
300 lreg_idx, //Index for Logical. Regs
301
302 TheISA::NumFloatRegs,
303 params->numPhysFloatRegs,
304 freg_idx, //Index for Float Regs
305
306 TheISA::NumMiscRegs,
307
308 TheISA::ZeroReg,
309 TheISA::ZeroReg,
310
311 tid,
312 bindRegs);
313
314 activateThreadEvent[tid].init(tid, this);
315 deallocateContextEvent[tid].init(tid, this);
316 }
317
318 rename.setRenameMap(renameMap);
319 commit.setRenameMap(commitRenameMap);
320
321 // Give renameMap & rename stage access to the freeList;
322 for (int i=0; i < numThreads; i++) {
323 renameMap[i].setFreeList(&freeList);
324 }
325 rename.setFreeList(&freeList);
326
327 // Setup the ROB for whichever stages need it.
328 commit.setROB(&rob);
329
330 lastRunningCycle = curTick;
331
332 lastActivatedCycle = -1;
333
334 // Give renameMap & rename stage access to the freeList;
335 //for (int i=0; i < numThreads; i++) {
336 //globalSeqNum[i] = 1;
337 //}
338
339 contextSwitch = false;
340}
341
342template <class Impl>
343FullO3CPU<Impl>::~FullO3CPU()
344{
345}
346
347template <class Impl>
348void
349FullO3CPU<Impl>::fullCPURegStats()
350{
351 BaseO3CPU::regStats();
352
353 // Register any of the O3CPU's stats here.
354 timesIdled
355 .name(name() + ".timesIdled")
356 .desc("Number of times that the entire CPU went into an idle state and"
357 " unscheduled itself")
358 .prereq(timesIdled);
359
360 idleCycles
361 .name(name() + ".idleCycles")
362 .desc("Total number of cycles that the CPU has spent unscheduled due "
363 "to idling")
364 .prereq(idleCycles);
365
366 // Number of Instructions simulated
367 // --------------------------------
368 // Should probably be in Base CPU but need templated
369 // MaxThreads so put in here instead
370 committedInsts
371 .init(numThreads)
372 .name(name() + ".committedInsts")
373 .desc("Number of Instructions Simulated");
374
375 totalCommittedInsts
376 .name(name() + ".committedInsts_total")
377 .desc("Number of Instructions Simulated");
378
379 cpi
380 .name(name() + ".cpi")
381 .desc("CPI: Cycles Per Instruction")
382 .precision(6);
383 cpi = numCycles / committedInsts;
384
385 totalCpi
386 .name(name() + ".cpi_total")
387 .desc("CPI: Total CPI of All Threads")
388 .precision(6);
389 totalCpi = numCycles / totalCommittedInsts;
390
391 ipc
392 .name(name() + ".ipc")
393 .desc("IPC: Instructions Per Cycle")
394 .precision(6);
395 ipc = committedInsts / numCycles;
396
397 totalIpc
398 .name(name() + ".ipc_total")
399 .desc("IPC: Total IPC of All Threads")
400 .precision(6);
401 totalIpc = totalCommittedInsts / numCycles;
402
403}
404
405template <class Impl>
406Port *
407FullO3CPU<Impl>::getPort(const std::string &if_name, int idx)
408{
409 if (if_name == "dcache_port")
410 return iew.getDcachePort();
411 else if (if_name == "icache_port")
412 return fetch.getIcachePort();
413 else
414 panic("No Such Port\n");
415}
416
417template <class Impl>
418void
419FullO3CPU<Impl>::tick()
420{
421 DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
422
423 ++numCycles;
424
425// activity = false;
426
427 //Tick each of the stages
428 fetch.tick();
429
430 decode.tick();
431
432 rename.tick();
433
434 iew.tick();
435
436 commit.tick();
437
438#if !FULL_SYSTEM
439 doContextSwitch();
440#endif
441
442 // Now advance the time buffers
443 timeBuffer.advance();
444
445 fetchQueue.advance();
446 decodeQueue.advance();
447 renameQueue.advance();
448 iewQueue.advance();
449
450 activityRec.advance();
451
452 if (removeInstsThisCycle) {
453 cleanUpRemovedInsts();
454 }
455
456 if (!tickEvent.scheduled()) {
457 if (_status == SwitchedOut ||
458 getState() == SimObject::Drained) {
459 DPRINTF(O3CPU, "Switched out!\n");
460 // increment stat
461 lastRunningCycle = curTick;
462 } else if (!activityRec.active() || _status == Idle) {
463 DPRINTF(O3CPU, "Idle!\n");
464 lastRunningCycle = curTick;
465 timesIdled++;
466 } else {
467 tickEvent.schedule(nextCycle(curTick + ticks(1)));
468 DPRINTF(O3CPU, "Scheduling next tick!\n");
469 }
470 }
471
472#if !FULL_SYSTEM
473 updateThreadPriority();
474#endif
475
476}
477
478template <class Impl>
479void
480FullO3CPU<Impl>::init()
481{
482 if (!deferRegistration) {
483 registerThreadContexts();
484 }
485
486 // Set inSyscall so that the CPU doesn't squash when initially
487 // setting up registers.
488 for (int i = 0; i < number_of_threads; ++i)
489 thread[i]->inSyscall = true;
490
491 for (int tid=0; tid < number_of_threads; tid++) {
492#if FULL_SYSTEM
493 ThreadContext *src_tc = threadContexts[tid];
494#else
495 ThreadContext *src_tc = thread[tid]->getTC();
496#endif
497 // Threads start in the Suspended State
498 if (src_tc->status() != ThreadContext::Suspended) {
499 continue;
500 }
501
502#if FULL_SYSTEM
503 TheISA::initCPU(src_tc, src_tc->readCpuId());
504#endif
505 }
506
507 // Clear inSyscall.
508 for (int i = 0; i < number_of_threads; ++i)
509 thread[i]->inSyscall = false;
510
511 // Initialize stages.
512 fetch.initStage();
513 iew.initStage();
514 rename.initStage();
515 commit.initStage();
516
517 commit.setThreads(thread);
518}
519
520template <class Impl>
521void
522FullO3CPU<Impl>::activateThread(unsigned tid)
523{
524 list<unsigned>::iterator isActive = find(
525 activeThreads.begin(), activeThreads.end(), tid);
526
527 DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid);
528
529 if (isActive == activeThreads.end()) {
530 DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
531 tid);
532
533 activeThreads.push_back(tid);
534 }
535}
536
537template <class Impl>
538void
539FullO3CPU<Impl>::deactivateThread(unsigned tid)
540{
541 //Remove From Active List, if Active
542 list::iterator thread_it =
543 find(activeThreads.begin(), activeThreads.end(), tid);
544
545 DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid);
546
547 if (thread_it != activeThreads.end()) {
548 DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
549 tid);
550 activeThreads.erase(thread_it);
551 }
552}
553
554template <class Impl>
555void
556FullO3CPU<Impl>::activateContext(int tid, int delay)
557{
558 // Needs to set each stage to running as well.
559 if (delay){
560 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate "
561 "on cycle %d\n", tid, curTick + ticks(delay));
562 scheduleActivateThreadEvent(tid, delay);
563 } else {
564 activateThread(tid);
565 }
566
567 if (lastActivatedCycle < curTick) {
568 scheduleTickEvent(delay);
569
570 // Be sure to signal that there's some activity so the CPU doesn't
571 // deschedule itself.
572 activityRec.activity();
573 fetch.wakeFromQuiesce();
574
575 lastActivatedCycle = curTick;
576
577 _status = Running;
578 }
579}
580
581template <class Impl>
582bool
583FullO3CPU<Impl>::deallocateContext(int tid, bool remove, int delay)
584{
585 // Schedule removal of thread data from CPU
586 if (delay){
587 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate "
588 "on cycle %d\n", tid, curTick + ticks(delay));
589 scheduleDeallocateContextEvent(tid, remove, delay);
590 return false;
591 } else {
592 deactivateThread(tid);
593 if (remove)
594 removeThread(tid);
595 return true;
596 }
597}
598
599template <class Impl>
600void
601FullO3CPU<Impl>::suspendContext(int tid)
602{
603 DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
604 bool deallocated = deallocateContext(tid, false, 1);
605 // If this was the last thread then unschedule the tick event.
606 if (activeThreads.size() == 1 && !deallocated ||
607 activeThreads.size() == 0)
608 unscheduleTickEvent();
609 _status = Idle;
610}
611
612template <class Impl>
613void
614FullO3CPU<Impl>::haltContext(int tid)
615{
616 //For now, this is the same as deallocate
617 DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid);
618 deallocateContext(tid, true, 1);
619}
620
621template <class Impl>
622void
623FullO3CPU<Impl>::insertThread(unsigned tid)
624{
625 DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
626 // Will change now that the PC and thread state is internal to the CPU
627 // and not in the ThreadContext.
628#if FULL_SYSTEM
629 ThreadContext *src_tc = system->threadContexts[tid];
630#else
631 ThreadContext *src_tc = tcBase(tid);
632#endif
633
634 //Bind Int Regs to Rename Map
635 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
636 PhysRegIndex phys_reg = freeList.getIntReg();
637
638 renameMap[tid].setEntry(ireg,phys_reg);
639 scoreboard.setReg(phys_reg);
640 }
641
642 //Bind Float Regs to Rename Map
643 for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
644 PhysRegIndex phys_reg = freeList.getFloatReg();
645
646 renameMap[tid].setEntry(freg,phys_reg);
647 scoreboard.setReg(phys_reg);
648 }
649
650 //Copy Thread Data Into RegFile
651 //this->copyFromTC(tid);
652
653 //Set PC/NPC/NNPC
654 setPC(src_tc->readPC(), tid);
655 setNextPC(src_tc->readNextPC(), tid);
656 setNextNPC(src_tc->readNextNPC(), tid);
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, sizeof(TheISA::MachInst), 0, squash_seq_num, 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
705 // Commented out for now. This should be possible to do by
706 // telling all the pipeline stages to drain first, and then
707 // checking until the drain completes. Once the pipeline is
708 // drained, call resetEntries(). - 10-09-06 ktlim
709/*
710 if (activeThreads.size() >= 1) {
711 commit.rob->resetEntries();
712 iew.resetEntries();
713 }
714*/
715}
716
717
718template <class Impl>
719void
720FullO3CPU<Impl>::activateWhenReady(int tid)
721{
722 DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming"
723 "(e.g. PhysRegs/ROB/IQ/LSQ) \n",
724 tid);
725
726 bool ready = true;
727
728 if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) {
729 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
730 "Phys. Int. Regs.\n",
731 tid);
732 ready = false;
733 } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) {
734 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
735 "Phys. Float. Regs.\n",
736 tid);
737 ready = false;
738 } else if (commit.rob->numFreeEntries() >=
739 commit.rob->entryAmount(activeThreads.size() + 1)) {
740 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
741 "ROB entries.\n",
742 tid);
743 ready = false;
744 } else if (iew.instQueue.numFreeEntries() >=
745 iew.instQueue.entryAmount(activeThreads.size() + 1)) {
746 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
747 "IQ entries.\n",
748 tid);
749 ready = false;
750 } else if (iew.ldstQueue.numFreeEntries() >=
751 iew.ldstQueue.entryAmount(activeThreads.size() + 1)) {
752 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
753 "LSQ entries.\n",
754 tid);
755 ready = false;
756 }
757
758 if (ready) {
759 insertThread(tid);
760
761 contextSwitch = false;
762
763 cpuWaitList.remove(tid);
764 } else {
765 suspendContext(tid);
766
767 //blocks fetch
768 contextSwitch = true;
769
770 //@todo: dont always add to waitlist
771 //do waitlist
772 cpuWaitList.push_back(tid);
773 }
774}
775
776#if FULL_SYSTEM
777template <class Impl>
778void
779FullO3CPU<Impl>::updateMemPorts()
780{
781 // Update all ThreadContext's memory ports (Functional/Virtual
782 // Ports)
783 for (int i = 0; i < thread.size(); ++i)
784 thread[i]->connectMemPorts();
785}
786#endif
787
788template <class Impl>
789void
790FullO3CPU<Impl>::serialize(std::ostream &os)
791{
792 SimObject::State so_state = SimObject::getState();
793 SERIALIZE_ENUM(so_state);
794 BaseCPU::serialize(os);
795 nameOut(os, csprintf("%s.tickEvent", name()));
796 tickEvent.serialize(os);
797
798 // Use SimpleThread's ability to checkpoint to make it easier to
799 // write out the registers. Also make this static so it doesn't
800 // get instantiated multiple times (causes a panic in statistics).
801 static SimpleThread temp;
802
803 for (int i = 0; i < thread.size(); i++) {
804 nameOut(os, csprintf("%s.xc.%i", name(), i));
805 temp.copyTC(thread[i]->getTC());
806 temp.serialize(os);
807 }
808}
809
810template <class Impl>
811void
812FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string &section)
813{
814 SimObject::State so_state;
815 UNSERIALIZE_ENUM(so_state);
816 BaseCPU::unserialize(cp, section);
817 tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
818
819 // Use SimpleThread's ability to checkpoint to make it easier to
820 // read in the registers. Also make this static so it doesn't
821 // get instantiated multiple times (causes a panic in statistics).
822 static SimpleThread temp;
823
824 for (int i = 0; i < thread.size(); i++) {
825 temp.copyTC(thread[i]->getTC());
826 temp.unserialize(cp, csprintf("%s.xc.%i", section, i));
827 thread[i]->getTC()->copyArchRegs(temp.getTC());
828 }
829}
830
831template <class Impl>
832unsigned int
833FullO3CPU<Impl>::drain(Event *drain_event)
834{
835 DPRINTF(O3CPU, "Switching out\n");
836
837 // If the CPU isn't doing anything, then return immediately.
838 if (_status == Idle || _status == SwitchedOut) {
839 return 0;
840 }
841
842 drainCount = 0;
843 fetch.drain();
844 decode.drain();
845 rename.drain();
846 iew.drain();
847 commit.drain();
848
849 // Wake the CPU and record activity so everything can drain out if
850 // the CPU was not able to immediately drain.
851 if (getState() != SimObject::Drained) {
852 // A bit of a hack...set the drainEvent after all the drain()
853 // calls have been made, that way if all of the stages drain
854 // immediately, the signalDrained() function knows not to call
855 // process on the drain event.
856 drainEvent = drain_event;
857
858 wakeCPU();
859 activityRec.activity();
860
861 return 1;
862 } else {
863 return 0;
864 }
865}
866
867template <class Impl>
868void
869FullO3CPU<Impl>::resume()
870{
871 fetch.resume();
872 decode.resume();
873 rename.resume();
874 iew.resume();
875 commit.resume();
876
877 changeState(SimObject::Running);
878
879 if (_status == SwitchedOut || _status == Idle)
880 return;
881
882#if FULL_SYSTEM
883 assert(system->getMemoryMode() == Enums::timing);
884#endif
885
886 if (!tickEvent.scheduled())
887 tickEvent.schedule(nextCycle());
888 _status = Running;
889}
890
891template <class Impl>
892void
893FullO3CPU<Impl>::signalDrained()
894{
895 if (++drainCount == NumStages) {
896 if (tickEvent.scheduled())
897 tickEvent.squash();
898
899 changeState(SimObject::Drained);
900
901 BaseCPU::switchOut();
902
903 if (drainEvent) {
904 drainEvent->process();
905 drainEvent = NULL;
906 }
907 }
908 assert(drainCount <= 5);
909}
910
911template <class Impl>
912void
913FullO3CPU<Impl>::switchOut()
914{
915 fetch.switchOut();
916 rename.switchOut();
917 iew.switchOut();
918 commit.switchOut();
919 instList.clear();
920 while (!removeList.empty()) {
921 removeList.pop();
922 }
923
924 _status = SwitchedOut;
925#if USE_CHECKER
926 if (checker)
927 checker->switchOut();
928#endif
929 if (tickEvent.scheduled())
930 tickEvent.squash();
931}
932
933template <class Impl>
934void
935FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
936{
937 // Flush out any old data from the time buffers.
938 for (int i = 0; i < timeBuffer.getSize(); ++i) {
939 timeBuffer.advance();
940 fetchQueue.advance();
941 decodeQueue.advance();
942 renameQueue.advance();
943 iewQueue.advance();
944 }
945
946 activityRec.reset();
947
948 BaseCPU::takeOverFrom(oldCPU, fetch.getIcachePort(), iew.getDcachePort());
949
950 fetch.takeOverFrom();
951 decode.takeOverFrom();
952 rename.takeOverFrom();
953 iew.takeOverFrom();
954 commit.takeOverFrom();
955
956 assert(!tickEvent.scheduled());
957
958 // @todo: Figure out how to properly select the tid to put onto
959 // the active threads list.
960 int tid = 0;
961
962 list<unsigned>::iterator isActive = find(
963 activeThreads.begin(), activeThreads.end(), tid);
964
965 if (isActive == activeThreads.end()) {
966 //May Need to Re-code this if the delay variable is the delay
967 //needed for thread to activate
968 DPRINTF(O3CPU, "Adding Thread %i to active threads list\n",
969 tid);
970
971 activeThreads.push_back(tid);
972 }
973
974 // Set all statuses to active, schedule the CPU's tick event.
975 // @todo: Fix up statuses so this is handled properly
976 for (int i = 0; i < threadContexts.size(); ++i) {
977 ThreadContext *tc = threadContexts[i];
978 if (tc->status() == ThreadContext::Active && _status != Running) {
979 _status = Running;
980 tickEvent.schedule(nextCycle());
981 }
982 }
983 if (!tickEvent.scheduled())
984 tickEvent.schedule(nextCycle());
985}
986
987template <class Impl>
988uint64_t
989FullO3CPU<Impl>::readIntReg(int reg_idx)
990{
991 return regFile.readIntReg(reg_idx);
992}
993
994template <class Impl>
995FloatReg
996FullO3CPU<Impl>::readFloatReg(int reg_idx, int width)
997{
998 return regFile.readFloatReg(reg_idx, width);
999}
1000
1001template <class Impl>
1002FloatReg
1003FullO3CPU<Impl>::readFloatReg(int reg_idx)
1004{
1005 return regFile.readFloatReg(reg_idx);
1006}
1007
1008template <class Impl>
1009FloatRegBits
1010FullO3CPU<Impl>::readFloatRegBits(int reg_idx, int width)
1011{
1012 return regFile.readFloatRegBits(reg_idx, width);
1013}
1014
1015template <class Impl>
1016FloatRegBits
1017FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
1018{
1019 return regFile.readFloatRegBits(reg_idx);
1020}
1021
1022template <class Impl>
1023void
1024FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
1025{
1026 regFile.setIntReg(reg_idx, val);
1027}
1028
1029template <class Impl>
1030void
1031FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val, int width)
1032{
1033 regFile.setFloatReg(reg_idx, val, width);
1034}
1035
1036template <class Impl>
1037void
1038FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
1039{
1040 regFile.setFloatReg(reg_idx, val);
1041}
1042
1043template <class Impl>
1044void
1045FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, int width)
1046{
1047 regFile.setFloatRegBits(reg_idx, val, width);
1048}
1049
1050template <class Impl>
1051void
1052FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
1053{
1054 regFile.setFloatRegBits(reg_idx, val);
1055}
1056
1057template <class Impl>
1058uint64_t
1059FullO3CPU<Impl>::readArchIntReg(int reg_idx, unsigned tid)
1060{
1061 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1062
1063 return regFile.readIntReg(phys_reg);
1064}
1065
1066template <class Impl>
1067float
1068FullO3CPU<Impl>::readArchFloatRegSingle(int reg_idx, unsigned tid)
1069{
1070 int idx = reg_idx + TheISA::FP_Base_DepTag;
1071 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1072
1073 return regFile.readFloatReg(phys_reg);
1074}
1075
1076template <class Impl>
1077double
1078FullO3CPU<Impl>::readArchFloatRegDouble(int reg_idx, unsigned tid)
1079{
1080 int idx = reg_idx + TheISA::FP_Base_DepTag;
1081 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1082
1083 return regFile.readFloatReg(phys_reg, 64);
1084}
1085
1086template <class Impl>
1087uint64_t
1088FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, unsigned tid)
1089{
1090 int idx = reg_idx + TheISA::FP_Base_DepTag;
1091 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1092
1093 return regFile.readFloatRegBits(phys_reg);
1094}
1095
1096template <class Impl>
1097void
1098FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, unsigned tid)
1099{
1100 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1101
1102 regFile.setIntReg(phys_reg, val);
1103}
1104
1105template <class Impl>
1106void
1107FullO3CPU<Impl>::setArchFloatRegSingle(int reg_idx, float val, unsigned tid)
1108{
1109 int idx = reg_idx + TheISA::FP_Base_DepTag;
1110 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1111
1112 regFile.setFloatReg(phys_reg, val);
1113}
1114
1115template <class Impl>
1116void
1117FullO3CPU<Impl>::setArchFloatRegDouble(int reg_idx, double val, unsigned tid)
1118{
1119 int idx = reg_idx + TheISA::FP_Base_DepTag;
1120 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1121
1122 regFile.setFloatReg(phys_reg, val, 64);
1123}
1124
1125template <class Impl>
1126void
1127FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, unsigned tid)
1128{
1129 int idx = reg_idx + TheISA::FP_Base_DepTag;
1130 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1131
1132 regFile.setFloatRegBits(phys_reg, val);
1133}
1134
1135template <class Impl>
1136uint64_t
1137FullO3CPU<Impl>::readPC(unsigned tid)
1138{
1139 return commit.readPC(tid);
1140}
1141
1142template <class Impl>
1143void
1144FullO3CPU<Impl>::setPC(Addr new_PC,unsigned tid)
1145{
1146 commit.setPC(new_PC, tid);
1147}
1148
1149template <class Impl>
1150uint64_t
1151FullO3CPU<Impl>::readMicroPC(unsigned tid)
1152{
1153 return commit.readMicroPC(tid);
1154}
1155
1156template <class Impl>
1157void
1158FullO3CPU<Impl>::setMicroPC(Addr new_PC,unsigned tid)
1159{
1160 commit.setMicroPC(new_PC, tid);
1161}
1162
1163template <class Impl>
1164uint64_t
1165FullO3CPU<Impl>::readNextPC(unsigned tid)
1166{
1167 return commit.readNextPC(tid);
1168}
1169
1170template <class Impl>
1171void
1172FullO3CPU<Impl>::setNextPC(uint64_t val,unsigned tid)
1173{
1174 commit.setNextPC(val, tid);
1175}
1176
1177template <class Impl>
1178uint64_t
1179FullO3CPU<Impl>::readNextNPC(unsigned tid)
1180{
1181 return commit.readNextNPC(tid);
1182}
1183
1184template <class Impl>
1185void
1186FullO3CPU<Impl>::setNextNPC(uint64_t val,unsigned tid)
1187{
1188 commit.setNextNPC(val, tid);
1189}
1190
1191template <class Impl>
1192uint64_t
1193FullO3CPU<Impl>::readNextMicroPC(unsigned tid)
1194{
1195 return commit.readNextMicroPC(tid);
1196}
1197
1198template <class Impl>
1199void
1200FullO3CPU<Impl>::setNextMicroPC(Addr new_PC,unsigned tid)
1201{
1202 commit.setNextMicroPC(new_PC, tid);
1203}
1204
1205template <class Impl>
1206typename FullO3CPU<Impl>::ListIt
1207FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1208{
1209 instList.push_back(inst);
1210
1211 return --(instList.end());
1212}
1213
1214template <class Impl>
1215void
1216FullO3CPU<Impl>::instDone(unsigned tid)
1217{
1218 // Keep an instruction count.
1219 thread[tid]->numInst++;
1220 thread[tid]->numInsts++;
1221 committedInsts[tid]++;
1222 totalCommittedInsts++;
1223
1224 // Check for instruction-count-based events.
1225 comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1226}
1227
1228template <class Impl>
1229void
1230FullO3CPU<Impl>::addToRemoveList(DynInstPtr &inst)
1231{
1232 removeInstsThisCycle = true;
1233
1234 removeList.push(inst->getInstListIt());
1235}
1236
1237template <class Impl>
1238void
1239FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1240{
1241 DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %#x "
1242 "[sn:%lli]\n",
1243 inst->threadNumber, inst->readPC(), inst->seqNum);
1244
1245 removeInstsThisCycle = true;
1246
1247 // Remove the front instruction.
1248 removeList.push(inst->getInstListIt());
1249}
1250
1251template <class Impl>
1252void
1253FullO3CPU<Impl>::removeInstsNotInROB(unsigned tid)
1254{
1255 DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1256 " list.\n", tid);
1257
1258 ListIt end_it;
1259
1260 bool rob_empty = false;
1261
1262 if (instList.empty()) {
1263 return;
1264 } else if (rob.isEmpty(/*tid*/)) {
1265 DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1266 end_it = instList.begin();
1267 rob_empty = true;
1268 } else {
1269 end_it = (rob.readTailInst(tid))->getInstListIt();
1270 DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1271 }
1272
1273 removeInstsThisCycle = true;
1274
1275 ListIt inst_it = instList.end();
1276
1277 inst_it--;
1278
1279 // Walk through the instruction list, removing any instructions
1280 // that were inserted after the given instruction iterator, end_it.
1281 while (inst_it != end_it) {
1282 assert(!instList.empty());
1283
1284 squashInstIt(inst_it, tid);
1285
1286 inst_it--;
1287 }
1288
1289 // If the ROB was empty, then we actually need to remove the first
1290 // instruction as well.
1291 if (rob_empty) {
1292 squashInstIt(inst_it, tid);
1293 }
1294}
1295
1296template <class Impl>
1297void
1298FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num,
1299 unsigned tid)
1300{
1301 assert(!instList.empty());
1302
1303 removeInstsThisCycle = true;
1304
1305 ListIt inst_iter = instList.end();
1306
1307 inst_iter--;
1308
1309 DPRINTF(O3CPU, "Deleting instructions from instruction "
1310 "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1311 tid, seq_num, (*inst_iter)->seqNum);
1312
1313 while ((*inst_iter)->seqNum > seq_num) {
1314
1315 bool break_loop = (inst_iter == instList.begin());
1316
1317 squashInstIt(inst_iter, tid);
1318
1319 inst_iter--;
1320
1321 if (break_loop)
1322 break;
1323 }
1324}
1325
1326template <class Impl>
1327inline void
1328FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, const unsigned &tid)
1329{
1330 if ((*instIt)->threadNumber == tid) {
1331 DPRINTF(O3CPU, "Squashing instruction, "
1332 "[tid:%i] [sn:%lli] PC %#x\n",
1333 (*instIt)->threadNumber,
1334 (*instIt)->seqNum,
1335 (*instIt)->readPC());
1336
1337 // Mark it as squashed.
1338 (*instIt)->setSquashed();
1339
1340 // @todo: Formulate a consistent method for deleting
1341 // instructions from the instruction list
1342 // Remove the instruction from the list.
1343 removeList.push(instIt);
1344 }
1345}
1346
1347template <class Impl>
1348void
1349FullO3CPU<Impl>::cleanUpRemovedInsts()
1350{
1351 while (!removeList.empty()) {
1352 DPRINTF(O3CPU, "Removing instruction, "
1353 "[tid:%i] [sn:%lli] PC %#x\n",
1354 (*removeList.front())->threadNumber,
1355 (*removeList.front())->seqNum,
1356 (*removeList.front())->readPC());
1357
1358 instList.erase(removeList.front());
1359
1360 removeList.pop();
1361 }
1362
1363 removeInstsThisCycle = false;
1364}
1365/*
1366template <class Impl>
1367void
1368FullO3CPU<Impl>::removeAllInsts()
1369{
1370 instList.clear();
1371}
1372*/
1373template <class Impl>
1374void
1375FullO3CPU<Impl>::dumpInsts()
1376{
1377 int num = 0;
1378
1379 ListIt inst_list_it = instList.begin();
1380
1381 cprintf("Dumping Instruction List\n");
1382
1383 while (inst_list_it != instList.end()) {
1384 cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1385 "Squashed:%i\n\n",
1386 num, (*inst_list_it)->readPC(), (*inst_list_it)->threadNumber,
1387 (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1388 (*inst_list_it)->isSquashed());
1389 inst_list_it++;
1390 ++num;
1391 }
1392}
1393/*
1394template <class Impl>
1395void
1396FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1397{
1398 iew.wakeDependents(inst);
1399}
1400*/
1401template <class Impl>
1402void
1403FullO3CPU<Impl>::wakeCPU()
1404{
1405 if (activityRec.active() || tickEvent.scheduled()) {
1406 DPRINTF(Activity, "CPU already running.\n");
1407 return;
1408 }
1409
1410 DPRINTF(Activity, "Waking up CPU\n");
1411
1412 idleCycles += tickToCycles((curTick - 1) - lastRunningCycle);
1413 numCycles += tickToCycles((curTick - 1) - lastRunningCycle);
1414
1415 tickEvent.schedule(nextCycle());
1416}
1417
1418template <class Impl>
1419int
1420FullO3CPU<Impl>::getFreeTid()
1421{
1422 for (int i=0; i < numThreads; i++) {
1423 if (!tids[i]) {
1424 tids[i] = true;
1425 return i;
1426 }
1427 }
1428
1429 return -1;
1430}
1431
1432template <class Impl>
1433void
1434FullO3CPU<Impl>::doContextSwitch()
1435{
1436 if (contextSwitch) {
1437
1438 //ADD CODE TO DEACTIVE THREAD HERE (???)
1439
1440 for (int tid=0; tid < cpuWaitList.size(); tid++) {
1441 activateWhenReady(tid);
1442 }
1443
1444 if (cpuWaitList.size() == 0)
1445 contextSwitch = true;
1446 }
1447}
1448
1449template <class Impl>
1450void
1451FullO3CPU<Impl>::updateThreadPriority()
1452{
1453 if (activeThreads.size() > 1)
1454 {
1455 //DEFAULT TO ROUND ROBIN SCHEME
1456 //e.g. Move highest priority to end of thread list
1457 list::iterator list_begin = activeThreads.begin();
1458 list::iterator list_end = activeThreads.end();
1459
1460 unsigned high_thread = *list_begin;
1461
1462 activeThreads.erase(list_begin);
1463
1464 activeThreads.push_back(high_thread);
1465 }
1466}
1467
1468// Forward declaration of FullO3CPU.
1469template class FullO3CPU<O3CPUImpl>;