1/*
2 * Copyright (c) 2011-2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2004-2006 The Regents of The University of Michigan
15 * Copyright (c) 2011 Regents of the University of California
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Kevin Lim
42 * Korey Sewell
43 * Rick Strong
44 */
45
46#include "arch/kernel_stats.hh"
47#include "config/the_isa.hh"
48#include "cpu/checker/cpu.hh"
49#include "cpu/checker/thread_context.hh"
50#include "cpu/o3/cpu.hh"
51#include "cpu/o3/isa_specific.hh"
52#include "cpu/o3/thread_context.hh"
53#include "cpu/activity.hh"
54#include "cpu/quiesce_event.hh"
55#include "cpu/simple_thread.hh"
56#include "cpu/thread_context.hh"
57#include "debug/Activity.hh"
58#include "debug/Drain.hh"
59#include "debug/O3CPU.hh"
60#include "debug/Quiesce.hh"
61#include "enums/MemoryMode.hh"
62#include "sim/core.hh"
63#include "sim/full_system.hh"
64#include "sim/process.hh"
65#include "sim/stat_control.hh"
66#include "sim/system.hh"
67
68#if THE_ISA == ALPHA_ISA
69#include "arch/alpha/osfpal.hh"
70#include "debug/Activity.hh"
71#endif
72
73struct BaseCPUParams;
74
75using namespace TheISA;
76using namespace std;
77
78BaseO3CPU::BaseO3CPU(BaseCPUParams *params)
79 : BaseCPU(params)
80{
81}
82
83void
84BaseO3CPU::regStats()
85{
86 BaseCPU::regStats();
87}
88
89template<class Impl>
90bool
91FullO3CPU<Impl>::IcachePort::recvTimingResp(PacketPtr pkt)
92{
93 DPRINTF(O3CPU, "Fetch unit received timing\n");
94 // We shouldn't ever get a block in ownership state
95 assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted()));
96 fetch->processCacheCompletion(pkt);
97
98 return true;
99}
100
101template<class Impl>
102void
103FullO3CPU<Impl>::IcachePort::recvRetry()
104{
105 fetch->recvRetry();
106}
107
108template <class Impl>
109bool
110FullO3CPU<Impl>::DcachePort::recvTimingResp(PacketPtr pkt)
111{
112 return lsq->recvTimingResp(pkt);
113}
114
115template <class Impl>
116void
117FullO3CPU<Impl>::DcachePort::recvTimingSnoopReq(PacketPtr pkt)
118{
119 lsq->recvTimingSnoopReq(pkt);
120}
121
122template <class Impl>
123void
124FullO3CPU<Impl>::DcachePort::recvRetry()
125{
126 lsq->recvRetry();
127}
128
129template <class Impl>
130FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c)
131 : Event(CPU_Tick_Pri), cpu(c)
132{
133}
134
135template <class Impl>
136void
137FullO3CPU<Impl>::TickEvent::process()
138{
139 cpu->tick();
140}
141
142template <class Impl>
143const char *
144FullO3CPU<Impl>::TickEvent::description() const
145{
146 return "FullO3CPU tick";
147}
148
149template <class Impl>
150FullO3CPU<Impl>::ActivateThreadEvent::ActivateThreadEvent()
151 : Event(CPU_Switch_Pri)
152{
153}
154
155template <class Impl>
156void
157FullO3CPU<Impl>::ActivateThreadEvent::init(int thread_num,
158 FullO3CPU<Impl> *thread_cpu)
159{
160 tid = thread_num;
161 cpu = thread_cpu;
162}
163
164template <class Impl>
165void
166FullO3CPU<Impl>::ActivateThreadEvent::process()
167{
168 cpu->activateThread(tid);
169}
170
171template <class Impl>
172const char *
173FullO3CPU<Impl>::ActivateThreadEvent::description() const
174{
175 return "FullO3CPU \"Activate Thread\"";
176}
177
178template <class Impl>
179FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent()
180 : Event(CPU_Tick_Pri), tid(0), remove(false), cpu(NULL)
181{
182}
183
184template <class Impl>
185void
186FullO3CPU<Impl>::DeallocateContextEvent::init(int thread_num,
187 FullO3CPU<Impl> *thread_cpu)
188{
189 tid = thread_num;
190 cpu = thread_cpu;
191 remove = false;
192}
193
194template <class Impl>
195void
196FullO3CPU<Impl>::DeallocateContextEvent::process()
197{
198 cpu->deactivateThread(tid);
199 if (remove)
200 cpu->removeThread(tid);
201}
202
203template <class Impl>
204const char *
205FullO3CPU<Impl>::DeallocateContextEvent::description() const
206{
207 return "FullO3CPU \"Deallocate Context\"";
208}
209
210template <class Impl>
211FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
212 : BaseO3CPU(params),
213 itb(params->itb),
214 dtb(params->dtb),
215 tickEvent(this),
216#ifndef NDEBUG
217 instcount(0),
218#endif
219 removeInstsThisCycle(false),
220 fetch(this, params),
221 decode(this, params),
222 rename(this, params),
223 iew(this, params),
224 commit(this, params),
225
226 regFile(this, params->numPhysIntRegs,
227 params->numPhysFloatRegs),
228
229 freeList(params->numThreads,
230 TheISA::NumIntRegs, params->numPhysIntRegs,
231 TheISA::NumFloatRegs, params->numPhysFloatRegs),
232
233 rob(this,
234 params->numROBEntries, params->squashWidth,
235 params->smtROBPolicy, params->smtROBThreshold,
236 params->numThreads),
237
238 scoreboard(params->numThreads,
239 TheISA::NumIntRegs, params->numPhysIntRegs,
240 TheISA::NumFloatRegs, params->numPhysFloatRegs,
241 TheISA::NumMiscRegs * numThreads,
242 TheISA::ZeroReg),
243
244 isa(numThreads, NULL),
245
246 icachePort(&fetch, this),
247 dcachePort(&iew.ldstQueue, this),
248
249 timeBuffer(params->backComSize, params->forwardComSize),
250 fetchQueue(params->backComSize, params->forwardComSize),
251 decodeQueue(params->backComSize, params->forwardComSize),
252 renameQueue(params->backComSize, params->forwardComSize),
253 iewQueue(params->backComSize, params->forwardComSize),
254 activityRec(name(), NumStages,
255 params->backComSize + params->forwardComSize,
256 params->activity),
257
258 globalSeqNum(1),
259 system(params->system),
260 drainCount(0),
261 lastRunningCycle(curCycle())
262{
263 if (!params->switched_out) {
264 _status = Running;
265 } else {
266 _status = SwitchedOut;
267 }
268
269 if (params->checker) {
270 BaseCPU *temp_checker = params->checker;
271 checker = dynamic_cast<Checker<Impl> *>(temp_checker);
272 checker->setIcachePort(&icachePort);
273 checker->setSystem(params->system);
274 } else {
275 checker = NULL;
276 }
277
278 if (!FullSystem) {
279 thread.resize(numThreads);
280 tids.resize(numThreads);
281 }
282
283 // The stages also need their CPU pointer setup. However this
284 // must be done at the upper level CPU because they have pointers
285 // to the upper level CPU, and not this FullO3CPU.
286
287 // Set up Pointers to the activeThreads list for each stage
288 fetch.setActiveThreads(&activeThreads);
289 decode.setActiveThreads(&activeThreads);
290 rename.setActiveThreads(&activeThreads);
291 iew.setActiveThreads(&activeThreads);
292 commit.setActiveThreads(&activeThreads);
293
294 // Give each of the stages the time buffer they will use.
295 fetch.setTimeBuffer(&timeBuffer);
296 decode.setTimeBuffer(&timeBuffer);
297 rename.setTimeBuffer(&timeBuffer);
298 iew.setTimeBuffer(&timeBuffer);
299 commit.setTimeBuffer(&timeBuffer);
300
301 // Also setup each of the stages' queues.
302 fetch.setFetchQueue(&fetchQueue);
303 decode.setFetchQueue(&fetchQueue);
304 commit.setFetchQueue(&fetchQueue);
305 decode.setDecodeQueue(&decodeQueue);
306 rename.setDecodeQueue(&decodeQueue);
307 rename.setRenameQueue(&renameQueue);
308 iew.setRenameQueue(&renameQueue);
309 iew.setIEWQueue(&iewQueue);
310 commit.setIEWQueue(&iewQueue);
311 commit.setRenameQueue(&renameQueue);
312
313 commit.setIEWStage(&iew);
314 rename.setIEWStage(&iew);
315 rename.setCommitStage(&commit);
316
317 ThreadID active_threads;
318 if (FullSystem) {
319 active_threads = 1;
320 } else {
321 active_threads = params->workload.size();
322
323 if (active_threads > Impl::MaxThreads) {
324 panic("Workload Size too large. Increase the 'MaxThreads' "
325 "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) "
326 "or edit your workload size.");
327 }
328 }
329
330 //Make Sure That this a Valid Architeture
331 assert(params->numPhysIntRegs >= numThreads * TheISA::NumIntRegs);
332 assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
333
334 rename.setScoreboard(&scoreboard);
335 iew.setScoreboard(&scoreboard);
336
337 // Setup the rename map for whichever stages need it.
338 PhysRegIndex lreg_idx = 0;
339 PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs
340
341 for (ThreadID tid = 0; tid < numThreads; tid++) {
342 bool bindRegs = (tid <= active_threads - 1);
343
344 isa[tid] = params->isa[tid];
345
346 commitRenameMap[tid].init(TheISA::NumIntRegs,
347 params->numPhysIntRegs,
348 lreg_idx, //Index for Logical. Regs
349
350 TheISA::NumFloatRegs,
351 params->numPhysFloatRegs,
352 freg_idx, //Index for Float Regs
353
354 TheISA::NumMiscRegs,
355
356 TheISA::ZeroReg,
357 TheISA::ZeroReg,
358
359 tid,
360 false);
361
362 renameMap[tid].init(TheISA::NumIntRegs,
363 params->numPhysIntRegs,
364 lreg_idx, //Index for Logical. Regs
365
366 TheISA::NumFloatRegs,
367 params->numPhysFloatRegs,
368 freg_idx, //Index for Float Regs
369
370 TheISA::NumMiscRegs,
371
372 TheISA::ZeroReg,
373 TheISA::ZeroReg,
374
375 tid,
376 bindRegs);
377
378 activateThreadEvent[tid].init(tid, this);
379 deallocateContextEvent[tid].init(tid, this);
380 }
381
382 rename.setRenameMap(renameMap);
383 commit.setRenameMap(commitRenameMap);
384
385 // Give renameMap & rename stage access to the freeList;
386 for (ThreadID tid = 0; tid < numThreads; tid++)
387 renameMap[tid].setFreeList(&freeList);
388 rename.setFreeList(&freeList);
389
390 // Setup the ROB for whichever stages need it.
391 commit.setROB(&rob);
392
393 lastActivatedCycle = 0;
394#if 0
395 // Give renameMap & rename stage access to the freeList;
396 for (ThreadID tid = 0; tid < numThreads; tid++)
397 globalSeqNum[tid] = 1;
398#endif
399
400 contextSwitch = false;
401 DPRINTF(O3CPU, "Creating O3CPU object.\n");
402
403 // Setup any thread state.
404 this->thread.resize(this->numThreads);
405
406 for (ThreadID tid = 0; tid < this->numThreads; ++tid) {
407 if (FullSystem) {
408 // SMT is not supported in FS mode yet.
409 assert(this->numThreads == 1);
410 this->thread[tid] = new Thread(this, 0, NULL);
411 } else {
412 if (tid < params->workload.size()) {
413 DPRINTF(O3CPU, "Workload[%i] process is %#x",
414 tid, this->thread[tid]);
415 this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
416 (typename Impl::O3CPU *)(this),
417 tid, params->workload[tid]);
418
419 //usedTids[tid] = true;
420 //threadMap[tid] = tid;
421 } else {
422 //Allocate Empty thread so M5 can use later
423 //when scheduling threads to CPU
424 Process* dummy_proc = NULL;
425
426 this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
427 (typename Impl::O3CPU *)(this),
428 tid, dummy_proc);
429 //usedTids[tid] = false;
430 }
431 }
432
433 ThreadContext *tc;
434
435 // Setup the TC that will serve as the interface to the threads/CPU.
436 O3ThreadContext<Impl> *o3_tc = new O3ThreadContext<Impl>;
437
438 tc = o3_tc;
439
440 // If we're using a checker, then the TC should be the
441 // CheckerThreadContext.
442 if (params->checker) {
443 tc = new CheckerThreadContext<O3ThreadContext<Impl> >(
444 o3_tc, this->checker);
445 }
446
447 o3_tc->cpu = (typename Impl::O3CPU *)(this);
448 assert(o3_tc->cpu);
449 o3_tc->thread = this->thread[tid];
450
451 if (FullSystem) {
452 // Setup quiesce event.
453 this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
454 }
455 // Give the thread the TC.
456 this->thread[tid]->tc = tc;
457
458 // Add the TC to the CPU's list of TC's.
459 this->threadContexts.push_back(tc);
460 }
461
462 // FullO3CPU always requires an interrupt controller.
463 if (!params->switched_out && !interrupts) {
464 fatal("FullO3CPU %s has no interrupt controller.\n"
465 "Ensure createInterruptController() is called.\n", name());
466 }
467
468 for (ThreadID tid = 0; tid < this->numThreads; tid++)
469 this->thread[tid]->setFuncExeInst(0);
470}
471
472template <class Impl>
473FullO3CPU<Impl>::~FullO3CPU()
474{
475}
476
477template <class Impl>
478void
479FullO3CPU<Impl>::regStats()
480{
481 BaseO3CPU::regStats();
482
483 // Register any of the O3CPU's stats here.
484 timesIdled
485 .name(name() + ".timesIdled")
486 .desc("Number of times that the entire CPU went into an idle state and"
487 " unscheduled itself")
488 .prereq(timesIdled);
489
490 idleCycles
491 .name(name() + ".idleCycles")
492 .desc("Total number of cycles that the CPU has spent unscheduled due "
493 "to idling")
494 .prereq(idleCycles);
495
496 quiesceCycles
497 .name(name() + ".quiesceCycles")
498 .desc("Total number of cycles that CPU has spent quiesced or waiting "
499 "for an interrupt")
500 .prereq(quiesceCycles);
501
502 // Number of Instructions simulated
503 // --------------------------------
504 // Should probably be in Base CPU but need templated
505 // MaxThreads so put in here instead
506 committedInsts
507 .init(numThreads)
508 .name(name() + ".committedInsts")
509 .desc("Number of Instructions Simulated");
510
511 committedOps
512 .init(numThreads)
513 .name(name() + ".committedOps")
514 .desc("Number of Ops (including micro ops) Simulated");
515
516 totalCommittedInsts
517 .name(name() + ".committedInsts_total")
518 .desc("Number of Instructions Simulated");
519
520 cpi
521 .name(name() + ".cpi")
522 .desc("CPI: Cycles Per Instruction")
523 .precision(6);
524 cpi = numCycles / committedInsts;
525
526 totalCpi
527 .name(name() + ".cpi_total")
528 .desc("CPI: Total CPI of All Threads")
529 .precision(6);
530 totalCpi = numCycles / totalCommittedInsts;
531
532 ipc
533 .name(name() + ".ipc")
534 .desc("IPC: Instructions Per Cycle")
535 .precision(6);
536 ipc = committedInsts / numCycles;
537
538 totalIpc
539 .name(name() + ".ipc_total")
540 .desc("IPC: Total IPC of All Threads")
541 .precision(6);
542 totalIpc = totalCommittedInsts / numCycles;
543
544 this->fetch.regStats();
545 this->decode.regStats();
546 this->rename.regStats();
547 this->iew.regStats();
548 this->commit.regStats();
549 this->rob.regStats();
550
551 intRegfileReads
552 .name(name() + ".int_regfile_reads")
553 .desc("number of integer regfile reads")
554 .prereq(intRegfileReads);
555
556 intRegfileWrites
557 .name(name() + ".int_regfile_writes")
558 .desc("number of integer regfile writes")
559 .prereq(intRegfileWrites);
560
561 fpRegfileReads
562 .name(name() + ".fp_regfile_reads")
563 .desc("number of floating regfile reads")
564 .prereq(fpRegfileReads);
565
566 fpRegfileWrites
567 .name(name() + ".fp_regfile_writes")
568 .desc("number of floating regfile writes")
569 .prereq(fpRegfileWrites);
570
571 miscRegfileReads
572 .name(name() + ".misc_regfile_reads")
573 .desc("number of misc regfile reads")
574 .prereq(miscRegfileReads);
575
576 miscRegfileWrites
577 .name(name() + ".misc_regfile_writes")
578 .desc("number of misc regfile writes")
579 .prereq(miscRegfileWrites);
580}
581
582template <class Impl>
583void
584FullO3CPU<Impl>::tick()
585{
586 DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
587
588 ++numCycles;
589
590// activity = false;
591
592 //Tick each of the stages
593 fetch.tick();
594
595 decode.tick();
596
597 rename.tick();
598
599 iew.tick();
600
601 commit.tick();
602
603 if (!FullSystem)
604 doContextSwitch();
605
606 // Now advance the time buffers
607 timeBuffer.advance();
608
609 fetchQueue.advance();
610 decodeQueue.advance();
611 renameQueue.advance();
612 iewQueue.advance();
613
614 activityRec.advance();
615
616 if (removeInstsThisCycle) {
617 cleanUpRemovedInsts();
618 }
619
620 if (!tickEvent.scheduled()) {
621 if (_status == SwitchedOut ||
622 getDrainState() == Drainable::Drained) {
623 DPRINTF(O3CPU, "Switched out!\n");
624 // increment stat
625 lastRunningCycle = curCycle();
626 } else if (!activityRec.active() || _status == Idle) {
627 DPRINTF(O3CPU, "Idle!\n");
628 lastRunningCycle = curCycle();
629 timesIdled++;
630 } else {
631 schedule(tickEvent, clockEdge(Cycles(1)));
632 DPRINTF(O3CPU, "Scheduling next tick!\n");
633 }
634 }
635
636 if (!FullSystem)
637 updateThreadPriority();
638}
639
640template <class Impl>
641void
642FullO3CPU<Impl>::init()
643{
644 BaseCPU::init();
645
646 if (!params()->switched_out &&
647 system->getMemoryMode() != Enums::timing) {
648 fatal("The O3 CPU requires the memory system to be in "
649 "'timing' mode.\n");
650 }
651
652 for (ThreadID tid = 0; tid < numThreads; ++tid) {
653 // Set noSquashFromTC so that the CPU doesn't squash when initially
654 // setting up registers.
655 thread[tid]->noSquashFromTC = true;
656 // Initialise the ThreadContext's memory proxies
657 thread[tid]->initMemProxies(thread[tid]->getTC());
658 }
659
660 // this CPU could still be unconnected if we are restoring from a
661 // checkpoint and this CPU is to be switched in, thus we can only
662 // do this here if the instruction port is actually connected, if
663 // not we have to do it as part of takeOverFrom
664 if (icachePort.isConnected())
665 fetch.setIcache();
666
667 if (FullSystem && !params()->switched_out) {
668 for (ThreadID tid = 0; tid < numThreads; tid++) {
669 ThreadContext *src_tc = threadContexts[tid];
670 TheISA::initCPU(src_tc, src_tc->contextId());
671 }
672 }
673
674 // Clear noSquashFromTC.
675 for (int tid = 0; tid < numThreads; ++tid)
676 thread[tid]->noSquashFromTC = false;
677
678 commit.setThreads(thread);
679}
680
681template <class Impl>
682void
683FullO3CPU<Impl>::startup()
684{
685 fetch.startupStage();
686 iew.startupStage();
687 rename.startupStage();
688 commit.startupStage();
689}
690
691template <class Impl>
692void
693FullO3CPU<Impl>::activateThread(ThreadID tid)
694{
695 list<ThreadID>::iterator isActive =
696 std::find(activeThreads.begin(), activeThreads.end(), tid);
697
698 DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid);
699
700 if (isActive == activeThreads.end()) {
701 DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
702 tid);
703
704 activeThreads.push_back(tid);
705 }
706}
707
708template <class Impl>
709void
710FullO3CPU<Impl>::deactivateThread(ThreadID tid)
711{
712 //Remove From Active List, if Active
713 list<ThreadID>::iterator thread_it =
714 std::find(activeThreads.begin(), activeThreads.end(), tid);
715
716 DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid);
717
718 if (thread_it != activeThreads.end()) {
719 DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
720 tid);
721 activeThreads.erase(thread_it);
722 }
723}
724
725template <class Impl>
726Counter
727FullO3CPU<Impl>::totalInsts() const
728{
729 Counter total(0);
730
731 ThreadID size = thread.size();
732 for (ThreadID i = 0; i < size; i++)
733 total += thread[i]->numInst;
734
735 return total;
736}
737
738template <class Impl>
739Counter
740FullO3CPU<Impl>::totalOps() const
741{
742 Counter total(0);
743
744 ThreadID size = thread.size();
745 for (ThreadID i = 0; i < size; i++)
746 total += thread[i]->numOp;
747
748 return total;
749}
750
751template <class Impl>
752void
753FullO3CPU<Impl>::activateContext(ThreadID tid, Cycles delay)
754{
755 // Needs to set each stage to running as well.
756 if (delay){
757 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate "
758 "on cycle %d\n", tid, clockEdge(delay));
759 scheduleActivateThreadEvent(tid, delay);
760 } else {
761 activateThread(tid);
762 }
763
764 // If we are time 0 or if the last activation time is in the past,
765 // schedule the next tick and wake up the fetch unit
766 if (lastActivatedCycle == 0 || lastActivatedCycle < curTick()) {
767 scheduleTickEvent(delay);
768
769 // Be sure to signal that there's some activity so the CPU doesn't
770 // deschedule itself.
771 activityRec.activity();
772 fetch.wakeFromQuiesce();
773
774 Cycles cycles(curCycle() - lastRunningCycle);
775 // @todo: This is an oddity that is only here to match the stats
776 if (cycles != 0)
777 --cycles;
778 quiesceCycles += cycles;
779
780 lastActivatedCycle = curTick();
781
782 _status = Running;
783 }
784}
785
786template <class Impl>
787bool
788FullO3CPU<Impl>::scheduleDeallocateContext(ThreadID tid, bool remove,
789 Cycles delay)
790{
791 // Schedule removal of thread data from CPU
792 if (delay){
793 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate "
794 "on tick %d\n", tid, clockEdge(delay));
795 scheduleDeallocateContextEvent(tid, remove, delay);
796 return false;
797 } else {
798 deactivateThread(tid);
799 if (remove)
800 removeThread(tid);
801 return true;
802 }
803}
804
805template <class Impl>
806void
807FullO3CPU<Impl>::suspendContext(ThreadID tid)
808{
809 DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
810 bool deallocated = scheduleDeallocateContext(tid, false, Cycles(1));
811 // If this was the last thread then unschedule the tick event.
812 if ((activeThreads.size() == 1 && !deallocated) ||
813 activeThreads.size() == 0)
814 unscheduleTickEvent();
815
816 DPRINTF(Quiesce, "Suspending Context\n");
817 lastRunningCycle = curCycle();
818 _status = Idle;
819}
820
821template <class Impl>
822void
823FullO3CPU<Impl>::haltContext(ThreadID tid)
824{
825 //For now, this is the same as deallocate
826 DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid);
827 scheduleDeallocateContext(tid, true, Cycles(1));
828}
829
830template <class Impl>
831void
832FullO3CPU<Impl>::insertThread(ThreadID tid)
833{
834 DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
835 // Will change now that the PC and thread state is internal to the CPU
836 // and not in the ThreadContext.
837 ThreadContext *src_tc;
838 if (FullSystem)
839 src_tc = system->threadContexts[tid];
840 else
841 src_tc = tcBase(tid);
842
843 //Bind Int Regs to Rename Map
844 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
845 PhysRegIndex phys_reg = freeList.getIntReg();
846
847 renameMap[tid].setEntry(ireg,phys_reg);
848 scoreboard.setReg(phys_reg);
849 }
850
851 //Bind Float Regs to Rename Map
852 for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
853 PhysRegIndex phys_reg = freeList.getFloatReg();
854
855 renameMap[tid].setEntry(freg,phys_reg);
856 scoreboard.setReg(phys_reg);
857 }
858
859 //Copy Thread Data Into RegFile
860 //this->copyFromTC(tid);
861
862 //Set PC/NPC/NNPC
863 pcState(src_tc->pcState(), tid);
864
865 src_tc->setStatus(ThreadContext::Active);
866
867 activateContext(tid, Cycles(1));
868
869 //Reset ROB/IQ/LSQ Entries
870 commit.rob->resetEntries();
871 iew.resetEntries();
872}
873
874template <class Impl>
875void
876FullO3CPU<Impl>::removeThread(ThreadID tid)
877{
878 DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
879
880 // Copy Thread Data From RegFile
881 // If thread is suspended, it might be re-allocated
882 // this->copyToTC(tid);
883
884
885 // @todo: 2-27-2008: Fix how we free up rename mappings
886 // here to alleviate the case for double-freeing registers
887 // in SMT workloads.
888
889 // Unbind Int Regs from Rename Map
890 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
891 PhysRegIndex phys_reg = renameMap[tid].lookup(ireg);
892
893 scoreboard.unsetReg(phys_reg);
894 freeList.addReg(phys_reg);
895 }
896
897 // Unbind Float Regs from Rename Map
898 for (int freg = TheISA::NumIntRegs; freg < TheISA::NumFloatRegs; freg++) {
899 PhysRegIndex phys_reg = renameMap[tid].lookup(freg);
900
901 scoreboard.unsetReg(phys_reg);
902 freeList.addReg(phys_reg);
903 }
904
905 // Squash Throughout Pipeline
906 DynInstPtr inst = commit.rob->readHeadInst(tid);
907 InstSeqNum squash_seq_num = inst->seqNum;
908 fetch.squash(0, squash_seq_num, inst, tid);
909 decode.squash(tid);
910 rename.squash(squash_seq_num, tid);
911 iew.squash(tid);
912 iew.ldstQueue.squash(squash_seq_num, tid);
913 commit.rob->squash(squash_seq_num, tid);
914
915
916 assert(iew.instQueue.getCount(tid) == 0);
917 assert(iew.ldstQueue.getCount(tid) == 0);
918
919 // Reset ROB/IQ/LSQ Entries
920
921 // Commented out for now. This should be possible to do by
922 // telling all the pipeline stages to drain first, and then
923 // checking until the drain completes. Once the pipeline is
924 // drained, call resetEntries(). - 10-09-06 ktlim
925/*
926 if (activeThreads.size() >= 1) {
927 commit.rob->resetEntries();
928 iew.resetEntries();
929 }
930*/
931}
932
933
934template <class Impl>
935void
936FullO3CPU<Impl>::activateWhenReady(ThreadID tid)
937{
938 DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming"
939 "(e.g. PhysRegs/ROB/IQ/LSQ) \n",
940 tid);
941
942 bool ready = true;
943
944 if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) {
945 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
946 "Phys. Int. Regs.\n",
947 tid);
948 ready = false;
949 } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) {
950 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
951 "Phys. Float. Regs.\n",
952 tid);
953 ready = false;
954 } else if (commit.rob->numFreeEntries() >=
955 commit.rob->entryAmount(activeThreads.size() + 1)) {
956 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
957 "ROB entries.\n",
958 tid);
959 ready = false;
960 } else if (iew.instQueue.numFreeEntries() >=
961 iew.instQueue.entryAmount(activeThreads.size() + 1)) {
962 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
963 "IQ entries.\n",
964 tid);
965 ready = false;
966 } else if (iew.ldstQueue.numFreeEntries() >=
967 iew.ldstQueue.entryAmount(activeThreads.size() + 1)) {
968 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
969 "LSQ entries.\n",
970 tid);
971 ready = false;
972 }
973
974 if (ready) {
975 insertThread(tid);
976
977 contextSwitch = false;
978
979 cpuWaitList.remove(tid);
980 } else {
981 suspendContext(tid);
982
983 //blocks fetch
984 contextSwitch = true;
985
986 //@todo: dont always add to waitlist
987 //do waitlist
988 cpuWaitList.push_back(tid);
989 }
990}
991
992template <class Impl>
993Fault
994FullO3CPU<Impl>::hwrei(ThreadID tid)
995{
996#if THE_ISA == ALPHA_ISA
997 // Need to clear the lock flag upon returning from an interrupt.
998 this->setMiscRegNoEffect(AlphaISA::MISCREG_LOCKFLAG, false, tid);
999
1000 this->thread[tid]->kernelStats->hwrei();
1001
1002 // FIXME: XXX check for interrupts? XXX
1003#endif
1004 return NoFault;
1005}
1006
1007template <class Impl>
1008bool
1009FullO3CPU<Impl>::simPalCheck(int palFunc, ThreadID tid)
1010{
1011#if THE_ISA == ALPHA_ISA
1012 if (this->thread[tid]->kernelStats)
1013 this->thread[tid]->kernelStats->callpal(palFunc,
1014 this->threadContexts[tid]);
1015
1016 switch (palFunc) {
1017 case PAL::halt:
1018 halt();
1019 if (--System::numSystemsRunning == 0)
1020 exitSimLoop("all cpus halted");
1021 break;
1022
1023 case PAL::bpt:
1024 case PAL::bugchk:
1025 if (this->system->breakpoint())
1026 return false;
1027 break;
1028 }
1029#endif
1030 return true;
1031}
1032
1033template <class Impl>
1034Fault
1035FullO3CPU<Impl>::getInterrupts()
1036{
1037 // Check if there are any outstanding interrupts
1038 return this->interrupts->getInterrupt(this->threadContexts[0]);
1039}
1040
1041template <class Impl>
1042void
1043FullO3CPU<Impl>::processInterrupts(Fault interrupt)
1044{
1045 // Check for interrupts here. For now can copy the code that
1046 // exists within isa_fullsys_traits.hh. Also assume that thread 0
1047 // is the one that handles the interrupts.
1048 // @todo: Possibly consolidate the interrupt checking code.
1049 // @todo: Allow other threads to handle interrupts.
1050
1051 assert(interrupt != NoFault);
1052 this->interrupts->updateIntrInfo(this->threadContexts[0]);
1053
1054 DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name());
1055 this->trap(interrupt, 0, NULL);
1056}
1057
1058template <class Impl>
1059void
1060FullO3CPU<Impl>::trap(Fault fault, ThreadID tid, StaticInstPtr inst)
1061{
1062 // Pass the thread's TC into the invoke method.
1063 fault->invoke(this->threadContexts[tid], inst);
1064}
1065
1066template <class Impl>
1067void
1068FullO3CPU<Impl>::syscall(int64_t callnum, ThreadID tid)
1069{
1070 DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid);
1071
1072 DPRINTF(Activity,"Activity: syscall() called.\n");
1073
1074 // Temporarily increase this by one to account for the syscall
1075 // instruction.
1076 ++(this->thread[tid]->funcExeInst);
1077
1078 // Execute the actual syscall.
1079 this->thread[tid]->syscall(callnum);
1080
1081 // Decrease funcExeInst by one as the normal commit will handle
1082 // incrementing it.
1083 --(this->thread[tid]->funcExeInst);
1084}
1085
1086template <class Impl>
1087void
1088FullO3CPU<Impl>::serialize(std::ostream &os)
1089{
1090 Drainable::State so_state(getDrainState());
1091 SERIALIZE_ENUM(so_state);
1092 BaseCPU::serialize(os);
1093 nameOut(os, csprintf("%s.tickEvent", name()));
1094 tickEvent.serialize(os);
1095
1096 for (ThreadID i = 0; i < thread.size(); i++) {
1097 nameOut(os, csprintf("%s.xc.%i", name(), i));
1098 thread[i]->serialize(os);
1099 }
1100}
1101
1102template <class Impl>
1103void
1104FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string §ion)
1105{
1106 Drainable::State so_state;
1107 UNSERIALIZE_ENUM(so_state);
1108 BaseCPU::unserialize(cp, section);
1109 tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
1110
1111 for (ThreadID i = 0; i < thread.size(); i++) {
1112 thread[i]->unserialize(cp,
1113 csprintf("%s.xc.%i", section, i));
1114 if (thread[i]->status() == ThreadContext::Active)
1115 activateThread(i);
1116 }
1117}
1118
1119template <class Impl>
1120unsigned int
1121FullO3CPU<Impl>::drain(DrainManager *drain_manager)
1122{
1123 DPRINTF(O3CPU, "Switching out\n");
1124
1125 // If the CPU isn't doing anything, then return immediately.
1126 if (_status == SwitchedOut)
1127 return 0;
1128
1129 drainCount = 0;
1130 fetch.drain();
1131 decode.drain();
1132 rename.drain();
1133 iew.drain();
1134 commit.drain();
1135
1136 // Wake the CPU and record activity so everything can drain out if
1137 // the CPU was not able to immediately drain.
1138 if (getDrainState() != Drainable::Drained) {
1139 // A bit of a hack...set the drainManager after all the drain()
1140 // calls have been made, that way if all of the stages drain
1141 // immediately, the signalDrained() function knows not to call
1142 // process on the drain event.
1143 drainManager = drain_manager;
1144
1145 wakeCPU();
1146 activityRec.activity();
1147
1148 DPRINTF(Drain, "CPU not drained\n");
1149
1150 return 1;
1151 } else {
1152 return 0;
1153 }
1154}
1155
1156template <class Impl>
1157void
1158FullO3CPU<Impl>::drainResume()
1159{
1160 fetch.resume();
1161 decode.resume();
1162 rename.resume();
1163 iew.resume();
1164 commit.resume();
1165
1166 setDrainState(Drainable::Running);
1167
1168 if (_status == SwitchedOut)
1169 return;
1170
1171 if (system->getMemoryMode() != Enums::timing) {
1172 fatal("The O3 CPU requires the memory system to be in "
1173 "'timing' mode.\n");
1174 }
1175
1176 if (!tickEvent.scheduled())
1177 schedule(tickEvent, nextCycle());
1178 _status = Running;
1179}
1180
1181template <class Impl>
1182void
1183FullO3CPU<Impl>::signalDrained()
1184{
1185 if (++drainCount == NumStages) {
1186 if (tickEvent.scheduled())
1187 tickEvent.squash();
1188
1189 setDrainState(Drainable::Drained);
1190
1191 if (drainManager) {
1192 DPRINTF(Drain, "CPU done draining, processing drain event\n");
1193 drainManager->signalDrainDone();
1194 drainManager = NULL;
1195 }
1196 }
1197 assert(drainCount <= 5);
1198}
1199
1200template <class Impl>
1201void
1202FullO3CPU<Impl>::switchOut()
1203{
1204 BaseCPU::switchOut();
1205
1206 fetch.switchOut();
1207 rename.switchOut();
1208 iew.switchOut();
1209 commit.switchOut();
1210 instList.clear();
1211 while (!removeList.empty()) {
1212 removeList.pop();
1213 }
1214
1215 _status = SwitchedOut;
1216
1217 if (checker)
1218 checker->switchOut();
1219
1220 if (tickEvent.scheduled())
1221 tickEvent.squash();
1222}
1223
1224template <class Impl>
1225void
1226FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
1227{
1228 // Flush out any old data from the time buffers.
1229 for (int i = 0; i < timeBuffer.getSize(); ++i) {
1230 timeBuffer.advance();
1231 fetchQueue.advance();
1232 decodeQueue.advance();
1233 renameQueue.advance();
1234 iewQueue.advance();
1235 }
1236
1237 activityRec.reset();
1238
1239 BaseCPU::takeOverFrom(oldCPU);
1240
1241 fetch.takeOverFrom();
1242 decode.takeOverFrom();
1243 rename.takeOverFrom();
1244 iew.takeOverFrom();
1245 commit.takeOverFrom();
1246
1247 assert(!tickEvent.scheduled() || tickEvent.squashed());
1248
1249 FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU);
1250 if (oldO3CPU)
1251 globalSeqNum = oldO3CPU->globalSeqNum;
1252
1253 // @todo: Figure out how to properly select the tid to put onto
1254 // the active threads list.
1255 ThreadID tid = 0;
1256
1257 list<ThreadID>::iterator isActive =
1258 std::find(activeThreads.begin(), activeThreads.end(), tid);
1259
1260 if (isActive == activeThreads.end()) {
1261 //May Need to Re-code this if the delay variable is the delay
1262 //needed for thread to activate
1263 DPRINTF(O3CPU, "Adding Thread %i to active threads list\n",
1264 tid);
1265
1266 activeThreads.push_back(tid);
1267 }
1268
1269 // Set all statuses to active, schedule the CPU's tick event.
1270 // @todo: Fix up statuses so this is handled properly
1271 ThreadID size = threadContexts.size();
1272 for (ThreadID i = 0; i < size; ++i) {
1273 ThreadContext *tc = threadContexts[i];
1274 if (tc->status() == ThreadContext::Active && _status != Running) {
1275 _status = Running;
1276 reschedule(tickEvent, nextCycle(), true);
1277 }
1278 }
1279 if (!tickEvent.scheduled())
1280 schedule(tickEvent, nextCycle());
1281
1282 lastRunningCycle = curCycle();
1283}
1284
1285template <class Impl>
1286TheISA::MiscReg
1287FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid)
1288{
1289 return this->isa[tid]->readMiscRegNoEffect(misc_reg);
1290}
1291
1292template <class Impl>
1293TheISA::MiscReg
1294FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid)
1295{
1296 miscRegfileReads++;
1297 return this->isa[tid]->readMiscReg(misc_reg, tcBase(tid));
1298}
1299
1300template <class Impl>
1301void
1302FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg,
1303 const TheISA::MiscReg &val, ThreadID tid)
1304{
1305 this->isa[tid]->setMiscRegNoEffect(misc_reg, val);
1306}
1307
1308template <class Impl>
1309void
1310FullO3CPU<Impl>::setMiscReg(int misc_reg,
1311 const TheISA::MiscReg &val, ThreadID tid)
1312{
1313 miscRegfileWrites++;
1314 this->isa[tid]->setMiscReg(misc_reg, val, tcBase(tid));
1315}
1316
1317template <class Impl>
1318uint64_t
1319FullO3CPU<Impl>::readIntReg(int reg_idx)
1320{
1321 intRegfileReads++;
1322 return regFile.readIntReg(reg_idx);
1323}
1324
1325template <class Impl>
1326FloatReg
1327FullO3CPU<Impl>::readFloatReg(int reg_idx)
1328{
1329 fpRegfileReads++;
1330 return regFile.readFloatReg(reg_idx);
1331}
1332
1333template <class Impl>
1334FloatRegBits
1335FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
1336{
1337 fpRegfileReads++;
1338 return regFile.readFloatRegBits(reg_idx);
1339}
1340
1341template <class Impl>
1342void
1343FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
1344{
1345 intRegfileWrites++;
1346 regFile.setIntReg(reg_idx, val);
1347}
1348
1349template <class Impl>
1350void
1351FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
1352{
1353 fpRegfileWrites++;
1354 regFile.setFloatReg(reg_idx, val);
1355}
1356
1357template <class Impl>
1358void
1359FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
1360{
1361 fpRegfileWrites++;
1362 regFile.setFloatRegBits(reg_idx, val);
1363}
1364
1365template <class Impl>
1366uint64_t
1367FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid)
1368{
1369 intRegfileReads++;
1370 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1371
1372 return regFile.readIntReg(phys_reg);
1373}
1374
1375template <class Impl>
1376float
1377FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid)
1378{
1379 fpRegfileReads++;
1380 int idx = reg_idx + TheISA::NumIntRegs;
1381 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1382
1383 return regFile.readFloatReg(phys_reg);
1384}
1385
1386template <class Impl>
1387uint64_t
1388FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, ThreadID tid)
1389{
1390 fpRegfileReads++;
1391 int idx = reg_idx + TheISA::NumIntRegs;
1392 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1393
1394 return regFile.readFloatRegBits(phys_reg);
1395}
1396
1397template <class Impl>
1398void
1399FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, ThreadID tid)
1400{
1401 intRegfileWrites++;
1402 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1403
1404 regFile.setIntReg(phys_reg, val);
1405}
1406
1407template <class Impl>
1408void
1409FullO3CPU<Impl>::setArchFloatReg(int reg_idx, float val, ThreadID tid)
1410{
1411 fpRegfileWrites++;
1412 int idx = reg_idx + TheISA::NumIntRegs;
1413 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1414
1415 regFile.setFloatReg(phys_reg, val);
1416}
1417
1418template <class Impl>
1419void
1420FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, ThreadID tid)
1421{
1422 fpRegfileWrites++;
1423 int idx = reg_idx + TheISA::NumIntRegs;
1424 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1425
1426 regFile.setFloatRegBits(phys_reg, val);
1427}
1428
1429template <class Impl>
1430TheISA::PCState
1431FullO3CPU<Impl>::pcState(ThreadID tid)
1432{
1433 return commit.pcState(tid);
1434}
1435
1436template <class Impl>
1437void
1438FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid)
1439{
1440 commit.pcState(val, tid);
1441}
1442
1443template <class Impl>
1444Addr
1445FullO3CPU<Impl>::instAddr(ThreadID tid)
1446{
1447 return commit.instAddr(tid);
1448}
1449
1450template <class Impl>
1451Addr
1452FullO3CPU<Impl>::nextInstAddr(ThreadID tid)
1453{
1454 return commit.nextInstAddr(tid);
1455}
1456
1457template <class Impl>
1458MicroPC
1459FullO3CPU<Impl>::microPC(ThreadID tid)
1460{
1461 return commit.microPC(tid);
1462}
1463
1464template <class Impl>
1465void
1466FullO3CPU<Impl>::squashFromTC(ThreadID tid)
1467{
1468 this->thread[tid]->noSquashFromTC = true;
1469 this->commit.generateTCEvent(tid);
1470}
1471
1472template <class Impl>
1473typename FullO3CPU<Impl>::ListIt
1474FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1475{
1476 instList.push_back(inst);
1477
1478 return --(instList.end());
1479}
1480
1481template <class Impl>
1482void
1483FullO3CPU<Impl>::instDone(ThreadID tid, DynInstPtr &inst)
1484{
1485 // Keep an instruction count.
1486 if (!inst->isMicroop() || inst->isLastMicroop()) {
1487 thread[tid]->numInst++;
1488 thread[tid]->numInsts++;
1489 committedInsts[tid]++;
1490 totalCommittedInsts++;
1491 }
1492 thread[tid]->numOp++;
1493 thread[tid]->numOps++;
1494 committedOps[tid]++;
1495
1496 system->totalNumInsts++;
1497 // Check for instruction-count-based events.
1498 comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1499 system->instEventQueue.serviceEvents(system->totalNumInsts);
1500}
1501
1502template <class Impl>
1503void
1504FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1505{
1506 DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s "
1507 "[sn:%lli]\n",
1508 inst->threadNumber, inst->pcState(), inst->seqNum);
1509
1510 removeInstsThisCycle = true;
1511
1512 // Remove the front instruction.
1513 removeList.push(inst->getInstListIt());
1514}
1515
1516template <class Impl>
1517void
1518FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid)
1519{
1520 DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1521 " list.\n", tid);
1522
1523 ListIt end_it;
1524
1525 bool rob_empty = false;
1526
1527 if (instList.empty()) {
1528 return;
1529 } else if (rob.isEmpty(/*tid*/)) {
1530 DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1531 end_it = instList.begin();
1532 rob_empty = true;
1533 } else {
1534 end_it = (rob.readTailInst(tid))->getInstListIt();
1535 DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1536 }
1537
1538 removeInstsThisCycle = true;
1539
1540 ListIt inst_it = instList.end();
1541
1542 inst_it--;
1543
1544 // Walk through the instruction list, removing any instructions
1545 // that were inserted after the given instruction iterator, end_it.
1546 while (inst_it != end_it) {
1547 assert(!instList.empty());
1548
1549 squashInstIt(inst_it, tid);
1550
1551 inst_it--;
1552 }
1553
1554 // If the ROB was empty, then we actually need to remove the first
1555 // instruction as well.
1556 if (rob_empty) {
1557 squashInstIt(inst_it, tid);
1558 }
1559}
1560
1561template <class Impl>
1562void
1563FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid)
1564{
1565 assert(!instList.empty());
1566
1567 removeInstsThisCycle = true;
1568
1569 ListIt inst_iter = instList.end();
1570
1571 inst_iter--;
1572
1573 DPRINTF(O3CPU, "Deleting instructions from instruction "
1574 "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1575 tid, seq_num, (*inst_iter)->seqNum);
1576
1577 while ((*inst_iter)->seqNum > seq_num) {
1578
1579 bool break_loop = (inst_iter == instList.begin());
1580
1581 squashInstIt(inst_iter, tid);
1582
1583 inst_iter--;
1584
1585 if (break_loop)
1586 break;
1587 }
1588}
1589
1590template <class Impl>
1591inline void
1592FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid)
1593{
1594 if ((*instIt)->threadNumber == tid) {
1595 DPRINTF(O3CPU, "Squashing instruction, "
1596 "[tid:%i] [sn:%lli] PC %s\n",
1597 (*instIt)->threadNumber,
1598 (*instIt)->seqNum,
1599 (*instIt)->pcState());
1600
1601 // Mark it as squashed.
1602 (*instIt)->setSquashed();
1603
1604 // @todo: Formulate a consistent method for deleting
1605 // instructions from the instruction list
1606 // Remove the instruction from the list.
1607 removeList.push(instIt);
1608 }
1609}
1610
1611template <class Impl>
1612void
1613FullO3CPU<Impl>::cleanUpRemovedInsts()
1614{
1615 while (!removeList.empty()) {
1616 DPRINTF(O3CPU, "Removing instruction, "
1617 "[tid:%i] [sn:%lli] PC %s\n",
1618 (*removeList.front())->threadNumber,
1619 (*removeList.front())->seqNum,
1620 (*removeList.front())->pcState());
1621
1622 instList.erase(removeList.front());
1623
1624 removeList.pop();
1625 }
1626
1627 removeInstsThisCycle = false;
1628}
1629/*
1630template <class Impl>
1631void
1632FullO3CPU<Impl>::removeAllInsts()
1633{
1634 instList.clear();
1635}
1636*/
1637template <class Impl>
1638void
1639FullO3CPU<Impl>::dumpInsts()
1640{
1641 int num = 0;
1642
1643 ListIt inst_list_it = instList.begin();
1644
1645 cprintf("Dumping Instruction List\n");
1646
1647 while (inst_list_it != instList.end()) {
1648 cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1649 "Squashed:%i\n\n",
1650 num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber,
1651 (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1652 (*inst_list_it)->isSquashed());
1653 inst_list_it++;
1654 ++num;
1655 }
1656}
1657/*
1658template <class Impl>
1659void
1660FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1661{
1662 iew.wakeDependents(inst);
1663}
1664*/
1665template <class Impl>
1666void
1667FullO3CPU<Impl>::wakeCPU()
1668{
1669 if (activityRec.active() || tickEvent.scheduled()) {
1670 DPRINTF(Activity, "CPU already running.\n");
1671 return;
1672 }
1673
1674 DPRINTF(Activity, "Waking up CPU\n");
1675
1676 Cycles cycles(curCycle() - lastRunningCycle);
1677 // @todo: This is an oddity that is only here to match the stats
1678 if (cycles != 0)
1679 --cycles;
1680 idleCycles += cycles;
1681 numCycles += cycles;
1682
1683 schedule(tickEvent, nextCycle());
1684}
1685
1686template <class Impl>
1687void
1688FullO3CPU<Impl>::wakeup()
1689{
1690 if (this->thread[0]->status() != ThreadContext::Suspended)
1691 return;
1692
1693 this->wakeCPU();
1694
1695 DPRINTF(Quiesce, "Suspended Processor woken\n");
1696 this->threadContexts[0]->activate();
1697}
1698
1699template <class Impl>
1700ThreadID
1701FullO3CPU<Impl>::getFreeTid()
1702{
1703 for (ThreadID tid = 0; tid < numThreads; tid++) {
1704 if (!tids[tid]) {
1705 tids[tid] = true;
1706 return tid;
1707 }
1708 }
1709
1710 return InvalidThreadID;
1711}
1712
1713template <class Impl>
1714void
1715FullO3CPU<Impl>::doContextSwitch()
1716{
1717 if (contextSwitch) {
1718
1719 //ADD CODE TO DEACTIVE THREAD HERE (???)
1720
1721 ThreadID size = cpuWaitList.size();
1722 for (ThreadID tid = 0; tid < size; tid++) {
1723 activateWhenReady(tid);
1724 }
1725
1726 if (cpuWaitList.size() == 0)
1727 contextSwitch = true;
1728 }
1729}
1730
1731template <class Impl>
1732void
1733FullO3CPU<Impl>::updateThreadPriority()
1734{
1735 if (activeThreads.size() > 1) {
1736 //DEFAULT TO ROUND ROBIN SCHEME
1737 //e.g. Move highest priority to end of thread list
1738 list<ThreadID>::iterator list_begin = activeThreads.begin();
1739
1740 unsigned high_thread = *list_begin;
1741
1742 activeThreads.erase(list_begin);
1743
1744 activeThreads.push_back(high_thread);
1745 }
1746}
1747
1748// Forward declaration of FullO3CPU.
1749template class FullO3CPU<O3CPUImpl>;
2 * Copyright (c) 2011-2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2004-2006 The Regents of The University of Michigan
15 * Copyright (c) 2011 Regents of the University of California
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Kevin Lim
42 * Korey Sewell
43 * Rick Strong
44 */
45
46#include "arch/kernel_stats.hh"
47#include "config/the_isa.hh"
48#include "cpu/checker/cpu.hh"
49#include "cpu/checker/thread_context.hh"
50#include "cpu/o3/cpu.hh"
51#include "cpu/o3/isa_specific.hh"
52#include "cpu/o3/thread_context.hh"
53#include "cpu/activity.hh"
54#include "cpu/quiesce_event.hh"
55#include "cpu/simple_thread.hh"
56#include "cpu/thread_context.hh"
57#include "debug/Activity.hh"
58#include "debug/Drain.hh"
59#include "debug/O3CPU.hh"
60#include "debug/Quiesce.hh"
61#include "enums/MemoryMode.hh"
62#include "sim/core.hh"
63#include "sim/full_system.hh"
64#include "sim/process.hh"
65#include "sim/stat_control.hh"
66#include "sim/system.hh"
67
68#if THE_ISA == ALPHA_ISA
69#include "arch/alpha/osfpal.hh"
70#include "debug/Activity.hh"
71#endif
72
73struct BaseCPUParams;
74
75using namespace TheISA;
76using namespace std;
77
78BaseO3CPU::BaseO3CPU(BaseCPUParams *params)
79 : BaseCPU(params)
80{
81}
82
83void
84BaseO3CPU::regStats()
85{
86 BaseCPU::regStats();
87}
88
89template<class Impl>
90bool
91FullO3CPU<Impl>::IcachePort::recvTimingResp(PacketPtr pkt)
92{
93 DPRINTF(O3CPU, "Fetch unit received timing\n");
94 // We shouldn't ever get a block in ownership state
95 assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted()));
96 fetch->processCacheCompletion(pkt);
97
98 return true;
99}
100
101template<class Impl>
102void
103FullO3CPU<Impl>::IcachePort::recvRetry()
104{
105 fetch->recvRetry();
106}
107
108template <class Impl>
109bool
110FullO3CPU<Impl>::DcachePort::recvTimingResp(PacketPtr pkt)
111{
112 return lsq->recvTimingResp(pkt);
113}
114
115template <class Impl>
116void
117FullO3CPU<Impl>::DcachePort::recvTimingSnoopReq(PacketPtr pkt)
118{
119 lsq->recvTimingSnoopReq(pkt);
120}
121
122template <class Impl>
123void
124FullO3CPU<Impl>::DcachePort::recvRetry()
125{
126 lsq->recvRetry();
127}
128
129template <class Impl>
130FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c)
131 : Event(CPU_Tick_Pri), cpu(c)
132{
133}
134
135template <class Impl>
136void
137FullO3CPU<Impl>::TickEvent::process()
138{
139 cpu->tick();
140}
141
142template <class Impl>
143const char *
144FullO3CPU<Impl>::TickEvent::description() const
145{
146 return "FullO3CPU tick";
147}
148
149template <class Impl>
150FullO3CPU<Impl>::ActivateThreadEvent::ActivateThreadEvent()
151 : Event(CPU_Switch_Pri)
152{
153}
154
155template <class Impl>
156void
157FullO3CPU<Impl>::ActivateThreadEvent::init(int thread_num,
158 FullO3CPU<Impl> *thread_cpu)
159{
160 tid = thread_num;
161 cpu = thread_cpu;
162}
163
164template <class Impl>
165void
166FullO3CPU<Impl>::ActivateThreadEvent::process()
167{
168 cpu->activateThread(tid);
169}
170
171template <class Impl>
172const char *
173FullO3CPU<Impl>::ActivateThreadEvent::description() const
174{
175 return "FullO3CPU \"Activate Thread\"";
176}
177
178template <class Impl>
179FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent()
180 : Event(CPU_Tick_Pri), tid(0), remove(false), cpu(NULL)
181{
182}
183
184template <class Impl>
185void
186FullO3CPU<Impl>::DeallocateContextEvent::init(int thread_num,
187 FullO3CPU<Impl> *thread_cpu)
188{
189 tid = thread_num;
190 cpu = thread_cpu;
191 remove = false;
192}
193
194template <class Impl>
195void
196FullO3CPU<Impl>::DeallocateContextEvent::process()
197{
198 cpu->deactivateThread(tid);
199 if (remove)
200 cpu->removeThread(tid);
201}
202
203template <class Impl>
204const char *
205FullO3CPU<Impl>::DeallocateContextEvent::description() const
206{
207 return "FullO3CPU \"Deallocate Context\"";
208}
209
210template <class Impl>
211FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
212 : BaseO3CPU(params),
213 itb(params->itb),
214 dtb(params->dtb),
215 tickEvent(this),
216#ifndef NDEBUG
217 instcount(0),
218#endif
219 removeInstsThisCycle(false),
220 fetch(this, params),
221 decode(this, params),
222 rename(this, params),
223 iew(this, params),
224 commit(this, params),
225
226 regFile(this, params->numPhysIntRegs,
227 params->numPhysFloatRegs),
228
229 freeList(params->numThreads,
230 TheISA::NumIntRegs, params->numPhysIntRegs,
231 TheISA::NumFloatRegs, params->numPhysFloatRegs),
232
233 rob(this,
234 params->numROBEntries, params->squashWidth,
235 params->smtROBPolicy, params->smtROBThreshold,
236 params->numThreads),
237
238 scoreboard(params->numThreads,
239 TheISA::NumIntRegs, params->numPhysIntRegs,
240 TheISA::NumFloatRegs, params->numPhysFloatRegs,
241 TheISA::NumMiscRegs * numThreads,
242 TheISA::ZeroReg),
243
244 isa(numThreads, NULL),
245
246 icachePort(&fetch, this),
247 dcachePort(&iew.ldstQueue, this),
248
249 timeBuffer(params->backComSize, params->forwardComSize),
250 fetchQueue(params->backComSize, params->forwardComSize),
251 decodeQueue(params->backComSize, params->forwardComSize),
252 renameQueue(params->backComSize, params->forwardComSize),
253 iewQueue(params->backComSize, params->forwardComSize),
254 activityRec(name(), NumStages,
255 params->backComSize + params->forwardComSize,
256 params->activity),
257
258 globalSeqNum(1),
259 system(params->system),
260 drainCount(0),
261 lastRunningCycle(curCycle())
262{
263 if (!params->switched_out) {
264 _status = Running;
265 } else {
266 _status = SwitchedOut;
267 }
268
269 if (params->checker) {
270 BaseCPU *temp_checker = params->checker;
271 checker = dynamic_cast<Checker<Impl> *>(temp_checker);
272 checker->setIcachePort(&icachePort);
273 checker->setSystem(params->system);
274 } else {
275 checker = NULL;
276 }
277
278 if (!FullSystem) {
279 thread.resize(numThreads);
280 tids.resize(numThreads);
281 }
282
283 // The stages also need their CPU pointer setup. However this
284 // must be done at the upper level CPU because they have pointers
285 // to the upper level CPU, and not this FullO3CPU.
286
287 // Set up Pointers to the activeThreads list for each stage
288 fetch.setActiveThreads(&activeThreads);
289 decode.setActiveThreads(&activeThreads);
290 rename.setActiveThreads(&activeThreads);
291 iew.setActiveThreads(&activeThreads);
292 commit.setActiveThreads(&activeThreads);
293
294 // Give each of the stages the time buffer they will use.
295 fetch.setTimeBuffer(&timeBuffer);
296 decode.setTimeBuffer(&timeBuffer);
297 rename.setTimeBuffer(&timeBuffer);
298 iew.setTimeBuffer(&timeBuffer);
299 commit.setTimeBuffer(&timeBuffer);
300
301 // Also setup each of the stages' queues.
302 fetch.setFetchQueue(&fetchQueue);
303 decode.setFetchQueue(&fetchQueue);
304 commit.setFetchQueue(&fetchQueue);
305 decode.setDecodeQueue(&decodeQueue);
306 rename.setDecodeQueue(&decodeQueue);
307 rename.setRenameQueue(&renameQueue);
308 iew.setRenameQueue(&renameQueue);
309 iew.setIEWQueue(&iewQueue);
310 commit.setIEWQueue(&iewQueue);
311 commit.setRenameQueue(&renameQueue);
312
313 commit.setIEWStage(&iew);
314 rename.setIEWStage(&iew);
315 rename.setCommitStage(&commit);
316
317 ThreadID active_threads;
318 if (FullSystem) {
319 active_threads = 1;
320 } else {
321 active_threads = params->workload.size();
322
323 if (active_threads > Impl::MaxThreads) {
324 panic("Workload Size too large. Increase the 'MaxThreads' "
325 "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) "
326 "or edit your workload size.");
327 }
328 }
329
330 //Make Sure That this a Valid Architeture
331 assert(params->numPhysIntRegs >= numThreads * TheISA::NumIntRegs);
332 assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
333
334 rename.setScoreboard(&scoreboard);
335 iew.setScoreboard(&scoreboard);
336
337 // Setup the rename map for whichever stages need it.
338 PhysRegIndex lreg_idx = 0;
339 PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs
340
341 for (ThreadID tid = 0; tid < numThreads; tid++) {
342 bool bindRegs = (tid <= active_threads - 1);
343
344 isa[tid] = params->isa[tid];
345
346 commitRenameMap[tid].init(TheISA::NumIntRegs,
347 params->numPhysIntRegs,
348 lreg_idx, //Index for Logical. Regs
349
350 TheISA::NumFloatRegs,
351 params->numPhysFloatRegs,
352 freg_idx, //Index for Float Regs
353
354 TheISA::NumMiscRegs,
355
356 TheISA::ZeroReg,
357 TheISA::ZeroReg,
358
359 tid,
360 false);
361
362 renameMap[tid].init(TheISA::NumIntRegs,
363 params->numPhysIntRegs,
364 lreg_idx, //Index for Logical. Regs
365
366 TheISA::NumFloatRegs,
367 params->numPhysFloatRegs,
368 freg_idx, //Index for Float Regs
369
370 TheISA::NumMiscRegs,
371
372 TheISA::ZeroReg,
373 TheISA::ZeroReg,
374
375 tid,
376 bindRegs);
377
378 activateThreadEvent[tid].init(tid, this);
379 deallocateContextEvent[tid].init(tid, this);
380 }
381
382 rename.setRenameMap(renameMap);
383 commit.setRenameMap(commitRenameMap);
384
385 // Give renameMap & rename stage access to the freeList;
386 for (ThreadID tid = 0; tid < numThreads; tid++)
387 renameMap[tid].setFreeList(&freeList);
388 rename.setFreeList(&freeList);
389
390 // Setup the ROB for whichever stages need it.
391 commit.setROB(&rob);
392
393 lastActivatedCycle = 0;
394#if 0
395 // Give renameMap & rename stage access to the freeList;
396 for (ThreadID tid = 0; tid < numThreads; tid++)
397 globalSeqNum[tid] = 1;
398#endif
399
400 contextSwitch = false;
401 DPRINTF(O3CPU, "Creating O3CPU object.\n");
402
403 // Setup any thread state.
404 this->thread.resize(this->numThreads);
405
406 for (ThreadID tid = 0; tid < this->numThreads; ++tid) {
407 if (FullSystem) {
408 // SMT is not supported in FS mode yet.
409 assert(this->numThreads == 1);
410 this->thread[tid] = new Thread(this, 0, NULL);
411 } else {
412 if (tid < params->workload.size()) {
413 DPRINTF(O3CPU, "Workload[%i] process is %#x",
414 tid, this->thread[tid]);
415 this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
416 (typename Impl::O3CPU *)(this),
417 tid, params->workload[tid]);
418
419 //usedTids[tid] = true;
420 //threadMap[tid] = tid;
421 } else {
422 //Allocate Empty thread so M5 can use later
423 //when scheduling threads to CPU
424 Process* dummy_proc = NULL;
425
426 this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
427 (typename Impl::O3CPU *)(this),
428 tid, dummy_proc);
429 //usedTids[tid] = false;
430 }
431 }
432
433 ThreadContext *tc;
434
435 // Setup the TC that will serve as the interface to the threads/CPU.
436 O3ThreadContext<Impl> *o3_tc = new O3ThreadContext<Impl>;
437
438 tc = o3_tc;
439
440 // If we're using a checker, then the TC should be the
441 // CheckerThreadContext.
442 if (params->checker) {
443 tc = new CheckerThreadContext<O3ThreadContext<Impl> >(
444 o3_tc, this->checker);
445 }
446
447 o3_tc->cpu = (typename Impl::O3CPU *)(this);
448 assert(o3_tc->cpu);
449 o3_tc->thread = this->thread[tid];
450
451 if (FullSystem) {
452 // Setup quiesce event.
453 this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
454 }
455 // Give the thread the TC.
456 this->thread[tid]->tc = tc;
457
458 // Add the TC to the CPU's list of TC's.
459 this->threadContexts.push_back(tc);
460 }
461
462 // FullO3CPU always requires an interrupt controller.
463 if (!params->switched_out && !interrupts) {
464 fatal("FullO3CPU %s has no interrupt controller.\n"
465 "Ensure createInterruptController() is called.\n", name());
466 }
467
468 for (ThreadID tid = 0; tid < this->numThreads; tid++)
469 this->thread[tid]->setFuncExeInst(0);
470}
471
472template <class Impl>
473FullO3CPU<Impl>::~FullO3CPU()
474{
475}
476
477template <class Impl>
478void
479FullO3CPU<Impl>::regStats()
480{
481 BaseO3CPU::regStats();
482
483 // Register any of the O3CPU's stats here.
484 timesIdled
485 .name(name() + ".timesIdled")
486 .desc("Number of times that the entire CPU went into an idle state and"
487 " unscheduled itself")
488 .prereq(timesIdled);
489
490 idleCycles
491 .name(name() + ".idleCycles")
492 .desc("Total number of cycles that the CPU has spent unscheduled due "
493 "to idling")
494 .prereq(idleCycles);
495
496 quiesceCycles
497 .name(name() + ".quiesceCycles")
498 .desc("Total number of cycles that CPU has spent quiesced or waiting "
499 "for an interrupt")
500 .prereq(quiesceCycles);
501
502 // Number of Instructions simulated
503 // --------------------------------
504 // Should probably be in Base CPU but need templated
505 // MaxThreads so put in here instead
506 committedInsts
507 .init(numThreads)
508 .name(name() + ".committedInsts")
509 .desc("Number of Instructions Simulated");
510
511 committedOps
512 .init(numThreads)
513 .name(name() + ".committedOps")
514 .desc("Number of Ops (including micro ops) Simulated");
515
516 totalCommittedInsts
517 .name(name() + ".committedInsts_total")
518 .desc("Number of Instructions Simulated");
519
520 cpi
521 .name(name() + ".cpi")
522 .desc("CPI: Cycles Per Instruction")
523 .precision(6);
524 cpi = numCycles / committedInsts;
525
526 totalCpi
527 .name(name() + ".cpi_total")
528 .desc("CPI: Total CPI of All Threads")
529 .precision(6);
530 totalCpi = numCycles / totalCommittedInsts;
531
532 ipc
533 .name(name() + ".ipc")
534 .desc("IPC: Instructions Per Cycle")
535 .precision(6);
536 ipc = committedInsts / numCycles;
537
538 totalIpc
539 .name(name() + ".ipc_total")
540 .desc("IPC: Total IPC of All Threads")
541 .precision(6);
542 totalIpc = totalCommittedInsts / numCycles;
543
544 this->fetch.regStats();
545 this->decode.regStats();
546 this->rename.regStats();
547 this->iew.regStats();
548 this->commit.regStats();
549 this->rob.regStats();
550
551 intRegfileReads
552 .name(name() + ".int_regfile_reads")
553 .desc("number of integer regfile reads")
554 .prereq(intRegfileReads);
555
556 intRegfileWrites
557 .name(name() + ".int_regfile_writes")
558 .desc("number of integer regfile writes")
559 .prereq(intRegfileWrites);
560
561 fpRegfileReads
562 .name(name() + ".fp_regfile_reads")
563 .desc("number of floating regfile reads")
564 .prereq(fpRegfileReads);
565
566 fpRegfileWrites
567 .name(name() + ".fp_regfile_writes")
568 .desc("number of floating regfile writes")
569 .prereq(fpRegfileWrites);
570
571 miscRegfileReads
572 .name(name() + ".misc_regfile_reads")
573 .desc("number of misc regfile reads")
574 .prereq(miscRegfileReads);
575
576 miscRegfileWrites
577 .name(name() + ".misc_regfile_writes")
578 .desc("number of misc regfile writes")
579 .prereq(miscRegfileWrites);
580}
581
582template <class Impl>
583void
584FullO3CPU<Impl>::tick()
585{
586 DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
587
588 ++numCycles;
589
590// activity = false;
591
592 //Tick each of the stages
593 fetch.tick();
594
595 decode.tick();
596
597 rename.tick();
598
599 iew.tick();
600
601 commit.tick();
602
603 if (!FullSystem)
604 doContextSwitch();
605
606 // Now advance the time buffers
607 timeBuffer.advance();
608
609 fetchQueue.advance();
610 decodeQueue.advance();
611 renameQueue.advance();
612 iewQueue.advance();
613
614 activityRec.advance();
615
616 if (removeInstsThisCycle) {
617 cleanUpRemovedInsts();
618 }
619
620 if (!tickEvent.scheduled()) {
621 if (_status == SwitchedOut ||
622 getDrainState() == Drainable::Drained) {
623 DPRINTF(O3CPU, "Switched out!\n");
624 // increment stat
625 lastRunningCycle = curCycle();
626 } else if (!activityRec.active() || _status == Idle) {
627 DPRINTF(O3CPU, "Idle!\n");
628 lastRunningCycle = curCycle();
629 timesIdled++;
630 } else {
631 schedule(tickEvent, clockEdge(Cycles(1)));
632 DPRINTF(O3CPU, "Scheduling next tick!\n");
633 }
634 }
635
636 if (!FullSystem)
637 updateThreadPriority();
638}
639
640template <class Impl>
641void
642FullO3CPU<Impl>::init()
643{
644 BaseCPU::init();
645
646 if (!params()->switched_out &&
647 system->getMemoryMode() != Enums::timing) {
648 fatal("The O3 CPU requires the memory system to be in "
649 "'timing' mode.\n");
650 }
651
652 for (ThreadID tid = 0; tid < numThreads; ++tid) {
653 // Set noSquashFromTC so that the CPU doesn't squash when initially
654 // setting up registers.
655 thread[tid]->noSquashFromTC = true;
656 // Initialise the ThreadContext's memory proxies
657 thread[tid]->initMemProxies(thread[tid]->getTC());
658 }
659
660 // this CPU could still be unconnected if we are restoring from a
661 // checkpoint and this CPU is to be switched in, thus we can only
662 // do this here if the instruction port is actually connected, if
663 // not we have to do it as part of takeOverFrom
664 if (icachePort.isConnected())
665 fetch.setIcache();
666
667 if (FullSystem && !params()->switched_out) {
668 for (ThreadID tid = 0; tid < numThreads; tid++) {
669 ThreadContext *src_tc = threadContexts[tid];
670 TheISA::initCPU(src_tc, src_tc->contextId());
671 }
672 }
673
674 // Clear noSquashFromTC.
675 for (int tid = 0; tid < numThreads; ++tid)
676 thread[tid]->noSquashFromTC = false;
677
678 commit.setThreads(thread);
679}
680
681template <class Impl>
682void
683FullO3CPU<Impl>::startup()
684{
685 fetch.startupStage();
686 iew.startupStage();
687 rename.startupStage();
688 commit.startupStage();
689}
690
691template <class Impl>
692void
693FullO3CPU<Impl>::activateThread(ThreadID tid)
694{
695 list<ThreadID>::iterator isActive =
696 std::find(activeThreads.begin(), activeThreads.end(), tid);
697
698 DPRINTF(O3CPU, "[tid:%i]: Calling activate thread.\n", tid);
699
700 if (isActive == activeThreads.end()) {
701 DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n",
702 tid);
703
704 activeThreads.push_back(tid);
705 }
706}
707
708template <class Impl>
709void
710FullO3CPU<Impl>::deactivateThread(ThreadID tid)
711{
712 //Remove From Active List, if Active
713 list<ThreadID>::iterator thread_it =
714 std::find(activeThreads.begin(), activeThreads.end(), tid);
715
716 DPRINTF(O3CPU, "[tid:%i]: Calling deactivate thread.\n", tid);
717
718 if (thread_it != activeThreads.end()) {
719 DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n",
720 tid);
721 activeThreads.erase(thread_it);
722 }
723}
724
725template <class Impl>
726Counter
727FullO3CPU<Impl>::totalInsts() const
728{
729 Counter total(0);
730
731 ThreadID size = thread.size();
732 for (ThreadID i = 0; i < size; i++)
733 total += thread[i]->numInst;
734
735 return total;
736}
737
738template <class Impl>
739Counter
740FullO3CPU<Impl>::totalOps() const
741{
742 Counter total(0);
743
744 ThreadID size = thread.size();
745 for (ThreadID i = 0; i < size; i++)
746 total += thread[i]->numOp;
747
748 return total;
749}
750
751template <class Impl>
752void
753FullO3CPU<Impl>::activateContext(ThreadID tid, Cycles delay)
754{
755 // Needs to set each stage to running as well.
756 if (delay){
757 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate "
758 "on cycle %d\n", tid, clockEdge(delay));
759 scheduleActivateThreadEvent(tid, delay);
760 } else {
761 activateThread(tid);
762 }
763
764 // If we are time 0 or if the last activation time is in the past,
765 // schedule the next tick and wake up the fetch unit
766 if (lastActivatedCycle == 0 || lastActivatedCycle < curTick()) {
767 scheduleTickEvent(delay);
768
769 // Be sure to signal that there's some activity so the CPU doesn't
770 // deschedule itself.
771 activityRec.activity();
772 fetch.wakeFromQuiesce();
773
774 Cycles cycles(curCycle() - lastRunningCycle);
775 // @todo: This is an oddity that is only here to match the stats
776 if (cycles != 0)
777 --cycles;
778 quiesceCycles += cycles;
779
780 lastActivatedCycle = curTick();
781
782 _status = Running;
783 }
784}
785
786template <class Impl>
787bool
788FullO3CPU<Impl>::scheduleDeallocateContext(ThreadID tid, bool remove,
789 Cycles delay)
790{
791 // Schedule removal of thread data from CPU
792 if (delay){
793 DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate "
794 "on tick %d\n", tid, clockEdge(delay));
795 scheduleDeallocateContextEvent(tid, remove, delay);
796 return false;
797 } else {
798 deactivateThread(tid);
799 if (remove)
800 removeThread(tid);
801 return true;
802 }
803}
804
805template <class Impl>
806void
807FullO3CPU<Impl>::suspendContext(ThreadID tid)
808{
809 DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid);
810 bool deallocated = scheduleDeallocateContext(tid, false, Cycles(1));
811 // If this was the last thread then unschedule the tick event.
812 if ((activeThreads.size() == 1 && !deallocated) ||
813 activeThreads.size() == 0)
814 unscheduleTickEvent();
815
816 DPRINTF(Quiesce, "Suspending Context\n");
817 lastRunningCycle = curCycle();
818 _status = Idle;
819}
820
821template <class Impl>
822void
823FullO3CPU<Impl>::haltContext(ThreadID tid)
824{
825 //For now, this is the same as deallocate
826 DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid);
827 scheduleDeallocateContext(tid, true, Cycles(1));
828}
829
830template <class Impl>
831void
832FullO3CPU<Impl>::insertThread(ThreadID tid)
833{
834 DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
835 // Will change now that the PC and thread state is internal to the CPU
836 // and not in the ThreadContext.
837 ThreadContext *src_tc;
838 if (FullSystem)
839 src_tc = system->threadContexts[tid];
840 else
841 src_tc = tcBase(tid);
842
843 //Bind Int Regs to Rename Map
844 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
845 PhysRegIndex phys_reg = freeList.getIntReg();
846
847 renameMap[tid].setEntry(ireg,phys_reg);
848 scoreboard.setReg(phys_reg);
849 }
850
851 //Bind Float Regs to Rename Map
852 for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) {
853 PhysRegIndex phys_reg = freeList.getFloatReg();
854
855 renameMap[tid].setEntry(freg,phys_reg);
856 scoreboard.setReg(phys_reg);
857 }
858
859 //Copy Thread Data Into RegFile
860 //this->copyFromTC(tid);
861
862 //Set PC/NPC/NNPC
863 pcState(src_tc->pcState(), tid);
864
865 src_tc->setStatus(ThreadContext::Active);
866
867 activateContext(tid, Cycles(1));
868
869 //Reset ROB/IQ/LSQ Entries
870 commit.rob->resetEntries();
871 iew.resetEntries();
872}
873
874template <class Impl>
875void
876FullO3CPU<Impl>::removeThread(ThreadID tid)
877{
878 DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
879
880 // Copy Thread Data From RegFile
881 // If thread is suspended, it might be re-allocated
882 // this->copyToTC(tid);
883
884
885 // @todo: 2-27-2008: Fix how we free up rename mappings
886 // here to alleviate the case for double-freeing registers
887 // in SMT workloads.
888
889 // Unbind Int Regs from Rename Map
890 for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) {
891 PhysRegIndex phys_reg = renameMap[tid].lookup(ireg);
892
893 scoreboard.unsetReg(phys_reg);
894 freeList.addReg(phys_reg);
895 }
896
897 // Unbind Float Regs from Rename Map
898 for (int freg = TheISA::NumIntRegs; freg < TheISA::NumFloatRegs; freg++) {
899 PhysRegIndex phys_reg = renameMap[tid].lookup(freg);
900
901 scoreboard.unsetReg(phys_reg);
902 freeList.addReg(phys_reg);
903 }
904
905 // Squash Throughout Pipeline
906 DynInstPtr inst = commit.rob->readHeadInst(tid);
907 InstSeqNum squash_seq_num = inst->seqNum;
908 fetch.squash(0, squash_seq_num, inst, tid);
909 decode.squash(tid);
910 rename.squash(squash_seq_num, tid);
911 iew.squash(tid);
912 iew.ldstQueue.squash(squash_seq_num, tid);
913 commit.rob->squash(squash_seq_num, tid);
914
915
916 assert(iew.instQueue.getCount(tid) == 0);
917 assert(iew.ldstQueue.getCount(tid) == 0);
918
919 // Reset ROB/IQ/LSQ Entries
920
921 // Commented out for now. This should be possible to do by
922 // telling all the pipeline stages to drain first, and then
923 // checking until the drain completes. Once the pipeline is
924 // drained, call resetEntries(). - 10-09-06 ktlim
925/*
926 if (activeThreads.size() >= 1) {
927 commit.rob->resetEntries();
928 iew.resetEntries();
929 }
930*/
931}
932
933
934template <class Impl>
935void
936FullO3CPU<Impl>::activateWhenReady(ThreadID tid)
937{
938 DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming"
939 "(e.g. PhysRegs/ROB/IQ/LSQ) \n",
940 tid);
941
942 bool ready = true;
943
944 if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) {
945 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
946 "Phys. Int. Regs.\n",
947 tid);
948 ready = false;
949 } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) {
950 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
951 "Phys. Float. Regs.\n",
952 tid);
953 ready = false;
954 } else if (commit.rob->numFreeEntries() >=
955 commit.rob->entryAmount(activeThreads.size() + 1)) {
956 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
957 "ROB entries.\n",
958 tid);
959 ready = false;
960 } else if (iew.instQueue.numFreeEntries() >=
961 iew.instQueue.entryAmount(activeThreads.size() + 1)) {
962 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
963 "IQ entries.\n",
964 tid);
965 ready = false;
966 } else if (iew.ldstQueue.numFreeEntries() >=
967 iew.ldstQueue.entryAmount(activeThreads.size() + 1)) {
968 DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough "
969 "LSQ entries.\n",
970 tid);
971 ready = false;
972 }
973
974 if (ready) {
975 insertThread(tid);
976
977 contextSwitch = false;
978
979 cpuWaitList.remove(tid);
980 } else {
981 suspendContext(tid);
982
983 //blocks fetch
984 contextSwitch = true;
985
986 //@todo: dont always add to waitlist
987 //do waitlist
988 cpuWaitList.push_back(tid);
989 }
990}
991
992template <class Impl>
993Fault
994FullO3CPU<Impl>::hwrei(ThreadID tid)
995{
996#if THE_ISA == ALPHA_ISA
997 // Need to clear the lock flag upon returning from an interrupt.
998 this->setMiscRegNoEffect(AlphaISA::MISCREG_LOCKFLAG, false, tid);
999
1000 this->thread[tid]->kernelStats->hwrei();
1001
1002 // FIXME: XXX check for interrupts? XXX
1003#endif
1004 return NoFault;
1005}
1006
1007template <class Impl>
1008bool
1009FullO3CPU<Impl>::simPalCheck(int palFunc, ThreadID tid)
1010{
1011#if THE_ISA == ALPHA_ISA
1012 if (this->thread[tid]->kernelStats)
1013 this->thread[tid]->kernelStats->callpal(palFunc,
1014 this->threadContexts[tid]);
1015
1016 switch (palFunc) {
1017 case PAL::halt:
1018 halt();
1019 if (--System::numSystemsRunning == 0)
1020 exitSimLoop("all cpus halted");
1021 break;
1022
1023 case PAL::bpt:
1024 case PAL::bugchk:
1025 if (this->system->breakpoint())
1026 return false;
1027 break;
1028 }
1029#endif
1030 return true;
1031}
1032
1033template <class Impl>
1034Fault
1035FullO3CPU<Impl>::getInterrupts()
1036{
1037 // Check if there are any outstanding interrupts
1038 return this->interrupts->getInterrupt(this->threadContexts[0]);
1039}
1040
1041template <class Impl>
1042void
1043FullO3CPU<Impl>::processInterrupts(Fault interrupt)
1044{
1045 // Check for interrupts here. For now can copy the code that
1046 // exists within isa_fullsys_traits.hh. Also assume that thread 0
1047 // is the one that handles the interrupts.
1048 // @todo: Possibly consolidate the interrupt checking code.
1049 // @todo: Allow other threads to handle interrupts.
1050
1051 assert(interrupt != NoFault);
1052 this->interrupts->updateIntrInfo(this->threadContexts[0]);
1053
1054 DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name());
1055 this->trap(interrupt, 0, NULL);
1056}
1057
1058template <class Impl>
1059void
1060FullO3CPU<Impl>::trap(Fault fault, ThreadID tid, StaticInstPtr inst)
1061{
1062 // Pass the thread's TC into the invoke method.
1063 fault->invoke(this->threadContexts[tid], inst);
1064}
1065
1066template <class Impl>
1067void
1068FullO3CPU<Impl>::syscall(int64_t callnum, ThreadID tid)
1069{
1070 DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid);
1071
1072 DPRINTF(Activity,"Activity: syscall() called.\n");
1073
1074 // Temporarily increase this by one to account for the syscall
1075 // instruction.
1076 ++(this->thread[tid]->funcExeInst);
1077
1078 // Execute the actual syscall.
1079 this->thread[tid]->syscall(callnum);
1080
1081 // Decrease funcExeInst by one as the normal commit will handle
1082 // incrementing it.
1083 --(this->thread[tid]->funcExeInst);
1084}
1085
1086template <class Impl>
1087void
1088FullO3CPU<Impl>::serialize(std::ostream &os)
1089{
1090 Drainable::State so_state(getDrainState());
1091 SERIALIZE_ENUM(so_state);
1092 BaseCPU::serialize(os);
1093 nameOut(os, csprintf("%s.tickEvent", name()));
1094 tickEvent.serialize(os);
1095
1096 for (ThreadID i = 0; i < thread.size(); i++) {
1097 nameOut(os, csprintf("%s.xc.%i", name(), i));
1098 thread[i]->serialize(os);
1099 }
1100}
1101
1102template <class Impl>
1103void
1104FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string §ion)
1105{
1106 Drainable::State so_state;
1107 UNSERIALIZE_ENUM(so_state);
1108 BaseCPU::unserialize(cp, section);
1109 tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
1110
1111 for (ThreadID i = 0; i < thread.size(); i++) {
1112 thread[i]->unserialize(cp,
1113 csprintf("%s.xc.%i", section, i));
1114 if (thread[i]->status() == ThreadContext::Active)
1115 activateThread(i);
1116 }
1117}
1118
1119template <class Impl>
1120unsigned int
1121FullO3CPU<Impl>::drain(DrainManager *drain_manager)
1122{
1123 DPRINTF(O3CPU, "Switching out\n");
1124
1125 // If the CPU isn't doing anything, then return immediately.
1126 if (_status == SwitchedOut)
1127 return 0;
1128
1129 drainCount = 0;
1130 fetch.drain();
1131 decode.drain();
1132 rename.drain();
1133 iew.drain();
1134 commit.drain();
1135
1136 // Wake the CPU and record activity so everything can drain out if
1137 // the CPU was not able to immediately drain.
1138 if (getDrainState() != Drainable::Drained) {
1139 // A bit of a hack...set the drainManager after all the drain()
1140 // calls have been made, that way if all of the stages drain
1141 // immediately, the signalDrained() function knows not to call
1142 // process on the drain event.
1143 drainManager = drain_manager;
1144
1145 wakeCPU();
1146 activityRec.activity();
1147
1148 DPRINTF(Drain, "CPU not drained\n");
1149
1150 return 1;
1151 } else {
1152 return 0;
1153 }
1154}
1155
1156template <class Impl>
1157void
1158FullO3CPU<Impl>::drainResume()
1159{
1160 fetch.resume();
1161 decode.resume();
1162 rename.resume();
1163 iew.resume();
1164 commit.resume();
1165
1166 setDrainState(Drainable::Running);
1167
1168 if (_status == SwitchedOut)
1169 return;
1170
1171 if (system->getMemoryMode() != Enums::timing) {
1172 fatal("The O3 CPU requires the memory system to be in "
1173 "'timing' mode.\n");
1174 }
1175
1176 if (!tickEvent.scheduled())
1177 schedule(tickEvent, nextCycle());
1178 _status = Running;
1179}
1180
1181template <class Impl>
1182void
1183FullO3CPU<Impl>::signalDrained()
1184{
1185 if (++drainCount == NumStages) {
1186 if (tickEvent.scheduled())
1187 tickEvent.squash();
1188
1189 setDrainState(Drainable::Drained);
1190
1191 if (drainManager) {
1192 DPRINTF(Drain, "CPU done draining, processing drain event\n");
1193 drainManager->signalDrainDone();
1194 drainManager = NULL;
1195 }
1196 }
1197 assert(drainCount <= 5);
1198}
1199
1200template <class Impl>
1201void
1202FullO3CPU<Impl>::switchOut()
1203{
1204 BaseCPU::switchOut();
1205
1206 fetch.switchOut();
1207 rename.switchOut();
1208 iew.switchOut();
1209 commit.switchOut();
1210 instList.clear();
1211 while (!removeList.empty()) {
1212 removeList.pop();
1213 }
1214
1215 _status = SwitchedOut;
1216
1217 if (checker)
1218 checker->switchOut();
1219
1220 if (tickEvent.scheduled())
1221 tickEvent.squash();
1222}
1223
1224template <class Impl>
1225void
1226FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
1227{
1228 // Flush out any old data from the time buffers.
1229 for (int i = 0; i < timeBuffer.getSize(); ++i) {
1230 timeBuffer.advance();
1231 fetchQueue.advance();
1232 decodeQueue.advance();
1233 renameQueue.advance();
1234 iewQueue.advance();
1235 }
1236
1237 activityRec.reset();
1238
1239 BaseCPU::takeOverFrom(oldCPU);
1240
1241 fetch.takeOverFrom();
1242 decode.takeOverFrom();
1243 rename.takeOverFrom();
1244 iew.takeOverFrom();
1245 commit.takeOverFrom();
1246
1247 assert(!tickEvent.scheduled() || tickEvent.squashed());
1248
1249 FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU);
1250 if (oldO3CPU)
1251 globalSeqNum = oldO3CPU->globalSeqNum;
1252
1253 // @todo: Figure out how to properly select the tid to put onto
1254 // the active threads list.
1255 ThreadID tid = 0;
1256
1257 list<ThreadID>::iterator isActive =
1258 std::find(activeThreads.begin(), activeThreads.end(), tid);
1259
1260 if (isActive == activeThreads.end()) {
1261 //May Need to Re-code this if the delay variable is the delay
1262 //needed for thread to activate
1263 DPRINTF(O3CPU, "Adding Thread %i to active threads list\n",
1264 tid);
1265
1266 activeThreads.push_back(tid);
1267 }
1268
1269 // Set all statuses to active, schedule the CPU's tick event.
1270 // @todo: Fix up statuses so this is handled properly
1271 ThreadID size = threadContexts.size();
1272 for (ThreadID i = 0; i < size; ++i) {
1273 ThreadContext *tc = threadContexts[i];
1274 if (tc->status() == ThreadContext::Active && _status != Running) {
1275 _status = Running;
1276 reschedule(tickEvent, nextCycle(), true);
1277 }
1278 }
1279 if (!tickEvent.scheduled())
1280 schedule(tickEvent, nextCycle());
1281
1282 lastRunningCycle = curCycle();
1283}
1284
1285template <class Impl>
1286TheISA::MiscReg
1287FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid)
1288{
1289 return this->isa[tid]->readMiscRegNoEffect(misc_reg);
1290}
1291
1292template <class Impl>
1293TheISA::MiscReg
1294FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid)
1295{
1296 miscRegfileReads++;
1297 return this->isa[tid]->readMiscReg(misc_reg, tcBase(tid));
1298}
1299
1300template <class Impl>
1301void
1302FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg,
1303 const TheISA::MiscReg &val, ThreadID tid)
1304{
1305 this->isa[tid]->setMiscRegNoEffect(misc_reg, val);
1306}
1307
1308template <class Impl>
1309void
1310FullO3CPU<Impl>::setMiscReg(int misc_reg,
1311 const TheISA::MiscReg &val, ThreadID tid)
1312{
1313 miscRegfileWrites++;
1314 this->isa[tid]->setMiscReg(misc_reg, val, tcBase(tid));
1315}
1316
1317template <class Impl>
1318uint64_t
1319FullO3CPU<Impl>::readIntReg(int reg_idx)
1320{
1321 intRegfileReads++;
1322 return regFile.readIntReg(reg_idx);
1323}
1324
1325template <class Impl>
1326FloatReg
1327FullO3CPU<Impl>::readFloatReg(int reg_idx)
1328{
1329 fpRegfileReads++;
1330 return regFile.readFloatReg(reg_idx);
1331}
1332
1333template <class Impl>
1334FloatRegBits
1335FullO3CPU<Impl>::readFloatRegBits(int reg_idx)
1336{
1337 fpRegfileReads++;
1338 return regFile.readFloatRegBits(reg_idx);
1339}
1340
1341template <class Impl>
1342void
1343FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val)
1344{
1345 intRegfileWrites++;
1346 regFile.setIntReg(reg_idx, val);
1347}
1348
1349template <class Impl>
1350void
1351FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val)
1352{
1353 fpRegfileWrites++;
1354 regFile.setFloatReg(reg_idx, val);
1355}
1356
1357template <class Impl>
1358void
1359FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val)
1360{
1361 fpRegfileWrites++;
1362 regFile.setFloatRegBits(reg_idx, val);
1363}
1364
1365template <class Impl>
1366uint64_t
1367FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid)
1368{
1369 intRegfileReads++;
1370 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1371
1372 return regFile.readIntReg(phys_reg);
1373}
1374
1375template <class Impl>
1376float
1377FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid)
1378{
1379 fpRegfileReads++;
1380 int idx = reg_idx + TheISA::NumIntRegs;
1381 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1382
1383 return regFile.readFloatReg(phys_reg);
1384}
1385
1386template <class Impl>
1387uint64_t
1388FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, ThreadID tid)
1389{
1390 fpRegfileReads++;
1391 int idx = reg_idx + TheISA::NumIntRegs;
1392 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1393
1394 return regFile.readFloatRegBits(phys_reg);
1395}
1396
1397template <class Impl>
1398void
1399FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, ThreadID tid)
1400{
1401 intRegfileWrites++;
1402 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx);
1403
1404 regFile.setIntReg(phys_reg, val);
1405}
1406
1407template <class Impl>
1408void
1409FullO3CPU<Impl>::setArchFloatReg(int reg_idx, float val, ThreadID tid)
1410{
1411 fpRegfileWrites++;
1412 int idx = reg_idx + TheISA::NumIntRegs;
1413 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1414
1415 regFile.setFloatReg(phys_reg, val);
1416}
1417
1418template <class Impl>
1419void
1420FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, ThreadID tid)
1421{
1422 fpRegfileWrites++;
1423 int idx = reg_idx + TheISA::NumIntRegs;
1424 PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx);
1425
1426 regFile.setFloatRegBits(phys_reg, val);
1427}
1428
1429template <class Impl>
1430TheISA::PCState
1431FullO3CPU<Impl>::pcState(ThreadID tid)
1432{
1433 return commit.pcState(tid);
1434}
1435
1436template <class Impl>
1437void
1438FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid)
1439{
1440 commit.pcState(val, tid);
1441}
1442
1443template <class Impl>
1444Addr
1445FullO3CPU<Impl>::instAddr(ThreadID tid)
1446{
1447 return commit.instAddr(tid);
1448}
1449
1450template <class Impl>
1451Addr
1452FullO3CPU<Impl>::nextInstAddr(ThreadID tid)
1453{
1454 return commit.nextInstAddr(tid);
1455}
1456
1457template <class Impl>
1458MicroPC
1459FullO3CPU<Impl>::microPC(ThreadID tid)
1460{
1461 return commit.microPC(tid);
1462}
1463
1464template <class Impl>
1465void
1466FullO3CPU<Impl>::squashFromTC(ThreadID tid)
1467{
1468 this->thread[tid]->noSquashFromTC = true;
1469 this->commit.generateTCEvent(tid);
1470}
1471
1472template <class Impl>
1473typename FullO3CPU<Impl>::ListIt
1474FullO3CPU<Impl>::addInst(DynInstPtr &inst)
1475{
1476 instList.push_back(inst);
1477
1478 return --(instList.end());
1479}
1480
1481template <class Impl>
1482void
1483FullO3CPU<Impl>::instDone(ThreadID tid, DynInstPtr &inst)
1484{
1485 // Keep an instruction count.
1486 if (!inst->isMicroop() || inst->isLastMicroop()) {
1487 thread[tid]->numInst++;
1488 thread[tid]->numInsts++;
1489 committedInsts[tid]++;
1490 totalCommittedInsts++;
1491 }
1492 thread[tid]->numOp++;
1493 thread[tid]->numOps++;
1494 committedOps[tid]++;
1495
1496 system->totalNumInsts++;
1497 // Check for instruction-count-based events.
1498 comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst);
1499 system->instEventQueue.serviceEvents(system->totalNumInsts);
1500}
1501
1502template <class Impl>
1503void
1504FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst)
1505{
1506 DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s "
1507 "[sn:%lli]\n",
1508 inst->threadNumber, inst->pcState(), inst->seqNum);
1509
1510 removeInstsThisCycle = true;
1511
1512 // Remove the front instruction.
1513 removeList.push(inst->getInstListIt());
1514}
1515
1516template <class Impl>
1517void
1518FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid)
1519{
1520 DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
1521 " list.\n", tid);
1522
1523 ListIt end_it;
1524
1525 bool rob_empty = false;
1526
1527 if (instList.empty()) {
1528 return;
1529 } else if (rob.isEmpty(/*tid*/)) {
1530 DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
1531 end_it = instList.begin();
1532 rob_empty = true;
1533 } else {
1534 end_it = (rob.readTailInst(tid))->getInstListIt();
1535 DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
1536 }
1537
1538 removeInstsThisCycle = true;
1539
1540 ListIt inst_it = instList.end();
1541
1542 inst_it--;
1543
1544 // Walk through the instruction list, removing any instructions
1545 // that were inserted after the given instruction iterator, end_it.
1546 while (inst_it != end_it) {
1547 assert(!instList.empty());
1548
1549 squashInstIt(inst_it, tid);
1550
1551 inst_it--;
1552 }
1553
1554 // If the ROB was empty, then we actually need to remove the first
1555 // instruction as well.
1556 if (rob_empty) {
1557 squashInstIt(inst_it, tid);
1558 }
1559}
1560
1561template <class Impl>
1562void
1563FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid)
1564{
1565 assert(!instList.empty());
1566
1567 removeInstsThisCycle = true;
1568
1569 ListIt inst_iter = instList.end();
1570
1571 inst_iter--;
1572
1573 DPRINTF(O3CPU, "Deleting instructions from instruction "
1574 "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
1575 tid, seq_num, (*inst_iter)->seqNum);
1576
1577 while ((*inst_iter)->seqNum > seq_num) {
1578
1579 bool break_loop = (inst_iter == instList.begin());
1580
1581 squashInstIt(inst_iter, tid);
1582
1583 inst_iter--;
1584
1585 if (break_loop)
1586 break;
1587 }
1588}
1589
1590template <class Impl>
1591inline void
1592FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid)
1593{
1594 if ((*instIt)->threadNumber == tid) {
1595 DPRINTF(O3CPU, "Squashing instruction, "
1596 "[tid:%i] [sn:%lli] PC %s\n",
1597 (*instIt)->threadNumber,
1598 (*instIt)->seqNum,
1599 (*instIt)->pcState());
1600
1601 // Mark it as squashed.
1602 (*instIt)->setSquashed();
1603
1604 // @todo: Formulate a consistent method for deleting
1605 // instructions from the instruction list
1606 // Remove the instruction from the list.
1607 removeList.push(instIt);
1608 }
1609}
1610
1611template <class Impl>
1612void
1613FullO3CPU<Impl>::cleanUpRemovedInsts()
1614{
1615 while (!removeList.empty()) {
1616 DPRINTF(O3CPU, "Removing instruction, "
1617 "[tid:%i] [sn:%lli] PC %s\n",
1618 (*removeList.front())->threadNumber,
1619 (*removeList.front())->seqNum,
1620 (*removeList.front())->pcState());
1621
1622 instList.erase(removeList.front());
1623
1624 removeList.pop();
1625 }
1626
1627 removeInstsThisCycle = false;
1628}
1629/*
1630template <class Impl>
1631void
1632FullO3CPU<Impl>::removeAllInsts()
1633{
1634 instList.clear();
1635}
1636*/
1637template <class Impl>
1638void
1639FullO3CPU<Impl>::dumpInsts()
1640{
1641 int num = 0;
1642
1643 ListIt inst_list_it = instList.begin();
1644
1645 cprintf("Dumping Instruction List\n");
1646
1647 while (inst_list_it != instList.end()) {
1648 cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
1649 "Squashed:%i\n\n",
1650 num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber,
1651 (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
1652 (*inst_list_it)->isSquashed());
1653 inst_list_it++;
1654 ++num;
1655 }
1656}
1657/*
1658template <class Impl>
1659void
1660FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst)
1661{
1662 iew.wakeDependents(inst);
1663}
1664*/
1665template <class Impl>
1666void
1667FullO3CPU<Impl>::wakeCPU()
1668{
1669 if (activityRec.active() || tickEvent.scheduled()) {
1670 DPRINTF(Activity, "CPU already running.\n");
1671 return;
1672 }
1673
1674 DPRINTF(Activity, "Waking up CPU\n");
1675
1676 Cycles cycles(curCycle() - lastRunningCycle);
1677 // @todo: This is an oddity that is only here to match the stats
1678 if (cycles != 0)
1679 --cycles;
1680 idleCycles += cycles;
1681 numCycles += cycles;
1682
1683 schedule(tickEvent, nextCycle());
1684}
1685
1686template <class Impl>
1687void
1688FullO3CPU<Impl>::wakeup()
1689{
1690 if (this->thread[0]->status() != ThreadContext::Suspended)
1691 return;
1692
1693 this->wakeCPU();
1694
1695 DPRINTF(Quiesce, "Suspended Processor woken\n");
1696 this->threadContexts[0]->activate();
1697}
1698
1699template <class Impl>
1700ThreadID
1701FullO3CPU<Impl>::getFreeTid()
1702{
1703 for (ThreadID tid = 0; tid < numThreads; tid++) {
1704 if (!tids[tid]) {
1705 tids[tid] = true;
1706 return tid;
1707 }
1708 }
1709
1710 return InvalidThreadID;
1711}
1712
1713template <class Impl>
1714void
1715FullO3CPU<Impl>::doContextSwitch()
1716{
1717 if (contextSwitch) {
1718
1719 //ADD CODE TO DEACTIVE THREAD HERE (???)
1720
1721 ThreadID size = cpuWaitList.size();
1722 for (ThreadID tid = 0; tid < size; tid++) {
1723 activateWhenReady(tid);
1724 }
1725
1726 if (cpuWaitList.size() == 0)
1727 contextSwitch = true;
1728 }
1729}
1730
1731template <class Impl>
1732void
1733FullO3CPU<Impl>::updateThreadPriority()
1734{
1735 if (activeThreads.size() > 1) {
1736 //DEFAULT TO ROUND ROBIN SCHEME
1737 //e.g. Move highest priority to end of thread list
1738 list<ThreadID>::iterator list_begin = activeThreads.begin();
1739
1740 unsigned high_thread = *list_begin;
1741
1742 activeThreads.erase(list_begin);
1743
1744 activeThreads.push_back(high_thread);
1745 }
1746}
1747
1748// Forward declaration of FullO3CPU.
1749template class FullO3CPU<O3CPUImpl>;