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) 2002-2005 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: Steve Reinhardt
42 * Nathan Binkert
43 * Rick Strong
44 */
45
46#include <iostream>
47#include <sstream>
48#include <string>
49
50#include "arch/tlb.hh"
51#include "base/loader/symtab.hh"
52#include "base/cprintf.hh"
53#include "base/misc.hh"
54#include "base/output.hh"
55#include "base/trace.hh"
56#include "cpu/base.hh"
57#include "cpu/checker/cpu.hh"
58#include "cpu/cpuevent.hh"
59#include "cpu/profile.hh"
60#include "cpu/thread_context.hh"
61#include "debug/SyscallVerbose.hh"
62#include "params/BaseCPU.hh"
63#include "sim/full_system.hh"
64#include "sim/process.hh"
65#include "sim/sim_events.hh"
66#include "sim/sim_exit.hh"
67#include "sim/system.hh"
68
69// Hack
70#include "sim/stat_control.hh"
71
72using namespace std;
73
74vector<BaseCPU *> BaseCPU::cpuList;
75
76// This variable reflects the max number of threads in any CPU. Be
77// careful to only use it once all the CPUs that you care about have
78// been initialized
79int maxThreadsPerCPU = 1;
80
81CPUProgressEvent::CPUProgressEvent(BaseCPU *_cpu, Tick ival)
82 : Event(Event::Progress_Event_Pri), _interval(ival), lastNumInst(0),
83 cpu(_cpu), _repeatEvent(true)
84{
85 if (_interval)
86 cpu->schedule(this, curTick() + _interval);
87}
88
89void
90CPUProgressEvent::process()
91{
92 Counter temp = cpu->totalOps();
93#ifndef NDEBUG
94 double ipc = double(temp - lastNumInst) / (_interval / cpu->clockPeriod());
95
96 DPRINTFN("%s progress event, total committed:%i, progress insts committed: "
97 "%lli, IPC: %0.8d\n", cpu->name(), temp, temp - lastNumInst,
98 ipc);
99 ipc = 0.0;
100#else
101 cprintf("%lli: %s progress event, total committed:%i, progress insts "
102 "committed: %lli\n", curTick(), cpu->name(), temp,
103 temp - lastNumInst);
104#endif
105 lastNumInst = temp;
106
107 if (_repeatEvent)
108 cpu->schedule(this, curTick() + _interval);
109}
110
111const char *
112CPUProgressEvent::description() const
113{
114 return "CPU Progress";
115}
116
117BaseCPU::BaseCPU(Params *p, bool is_checker)
118 : MemObject(p), instCnt(0), _cpuId(p->cpu_id),
119 _instMasterId(p->system->getMasterId(name() + ".inst")),
120 _dataMasterId(p->system->getMasterId(name() + ".data")),
121 _taskId(ContextSwitchTaskId::Unknown), _pid(Request::invldPid),
122 _switchedOut(p->defer_registration),
123 interrupts(p->interrupts), profileEvent(NULL),
124 numThreads(p->numThreads), system(p->system)
125{
126 // if Python did not provide a valid ID, do it here
127 if (_cpuId == -1 ) {
128 _cpuId = cpuList.size();
129 }
130
131 // add self to global list of CPUs
132 cpuList.push_back(this);
133
134 DPRINTF(SyscallVerbose, "Constructing CPU with id %d\n", _cpuId);
135
136 if (numThreads > maxThreadsPerCPU)
137 maxThreadsPerCPU = numThreads;
138
139 // allocate per-thread instruction-based event queues
140 comInstEventQueue = new EventQueue *[numThreads];
141 for (ThreadID tid = 0; tid < numThreads; ++tid)
142 comInstEventQueue[tid] =
143 new EventQueue("instruction-based event queue");
144
145 //
146 // set up instruction-count-based termination events, if any
147 //
148 if (p->max_insts_any_thread != 0) {
149 const char *cause = "a thread reached the max instruction count";
150 for (ThreadID tid = 0; tid < numThreads; ++tid) {
151 Event *event = new SimLoopExitEvent(cause, 0);
152 comInstEventQueue[tid]->schedule(event, p->max_insts_any_thread);
153 }
154 }
155
156 if (p->max_insts_all_threads != 0) {
157 const char *cause = "all threads reached the max instruction count";
158
159 // allocate & initialize shared downcounter: each event will
160 // decrement this when triggered; simulation will terminate
161 // when counter reaches 0
162 int *counter = new int;
163 *counter = numThreads;
164 for (ThreadID tid = 0; tid < numThreads; ++tid) {
165 Event *event = new CountedExitEvent(cause, *counter);
166 comInstEventQueue[tid]->schedule(event, p->max_insts_all_threads);
167 }
168 }
169
170 // allocate per-thread load-based event queues
171 comLoadEventQueue = new EventQueue *[numThreads];
172 for (ThreadID tid = 0; tid < numThreads; ++tid)
173 comLoadEventQueue[tid] = new EventQueue("load-based event queue");
174
175 //
176 // set up instruction-count-based termination events, if any
177 //
178 if (p->max_loads_any_thread != 0) {
179 const char *cause = "a thread reached the max load count";
180 for (ThreadID tid = 0; tid < numThreads; ++tid) {
181 Event *event = new SimLoopExitEvent(cause, 0);
182 comLoadEventQueue[tid]->schedule(event, p->max_loads_any_thread);
183 }
184 }
185
186 if (p->max_loads_all_threads != 0) {
187 const char *cause = "all threads reached the max load count";
188 // allocate & initialize shared downcounter: each event will
189 // decrement this when triggered; simulation will terminate
190 // when counter reaches 0
191 int *counter = new int;
192 *counter = numThreads;
193 for (ThreadID tid = 0; tid < numThreads; ++tid) {
194 Event *event = new CountedExitEvent(cause, *counter);
195 comLoadEventQueue[tid]->schedule(event, p->max_loads_all_threads);
196 }
197 }
198
199 functionTracingEnabled = false;
200 if (p->function_trace) {
201 const string fname = csprintf("ftrace.%s", name());
202 functionTraceStream = simout.find(fname);
203 if (!functionTraceStream)
204 functionTraceStream = simout.create(fname);
205
206 currentFunctionStart = currentFunctionEnd = 0;
207 functionEntryTick = p->function_trace_start;
208
209 if (p->function_trace_start == 0) {
210 functionTracingEnabled = true;
211 } else {
212 typedef EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace> wrap;
213 Event *event = new wrap(this, true);
214 schedule(event, p->function_trace_start);
215 }
216 }
217
218 // The interrupts should always be present unless this CPU is
219 // switched in later or in case it is a checker CPU
220 if (!params()->defer_registration && !is_checker) {
221 if (interrupts) {
222 interrupts->setCPU(this);
223 } else {
224 fatal("CPU %s has no interrupt controller.\n"
225 "Ensure createInterruptController() is called.\n", name());
226 }
227 }
228
229 if (FullSystem) {
230 if (params()->profile)
231 profileEvent = new ProfileEvent(this, params()->profile);
232 }
233 tracer = params()->tracer;
234
235 if (params()->isa.size() != numThreads) {
236 fatal("Number of ISAs (%i) assigned to the CPU does not equal number "
237 "of threads (%i).\n", params()->isa.size(), numThreads);
238 }
239}
240
241void
242BaseCPU::enableFunctionTrace()
243{
244 functionTracingEnabled = true;
245}
246
247BaseCPU::~BaseCPU()
248{
249 delete profileEvent;
250 delete[] comLoadEventQueue;
251 delete[] comInstEventQueue;
252}
253
254void
255BaseCPU::init()
256{
257 if (!params()->defer_registration)
258 registerThreadContexts();
259}
260
261void
262BaseCPU::startup()
263{
264 if (FullSystem) {
265 if (!params()->defer_registration && profileEvent)
266 schedule(profileEvent, curTick());
267 }
268
269 if (params()->progress_interval) {
270 new CPUProgressEvent(this, params()->progress_interval);
271 }
272}
273
274
275void
276BaseCPU::regStats()
277{
278 using namespace Stats;
279
280 numCycles
281 .name(name() + ".numCycles")
282 .desc("number of cpu cycles simulated")
283 ;
284
285 numWorkItemsStarted
286 .name(name() + ".numWorkItemsStarted")
287 .desc("number of work items this cpu started")
288 ;
289
290 numWorkItemsCompleted
291 .name(name() + ".numWorkItemsCompleted")
292 .desc("number of work items this cpu completed")
293 ;
294
295 int size = threadContexts.size();
296 if (size > 1) {
297 for (int i = 0; i < size; ++i) {
298 stringstream namestr;
299 ccprintf(namestr, "%s.ctx%d", name(), i);
300 threadContexts[i]->regStats(namestr.str());
301 }
302 } else if (size == 1)
303 threadContexts[0]->regStats(name());
304}
305
306BaseMasterPort &
307BaseCPU::getMasterPort(const string &if_name, PortID idx)
308{
309 // Get the right port based on name. This applies to all the
310 // subclasses of the base CPU and relies on their implementation
311 // of getDataPort and getInstPort. In all cases there methods
312 // return a CpuPort pointer.
313 if (if_name == "dcache_port")
314 return getDataPort();
315 else if (if_name == "icache_port")
316 return getInstPort();
317 else
318 return MemObject::getMasterPort(if_name, idx);
319}
320
321void
322BaseCPU::registerThreadContexts()
323{
324 ThreadID size = threadContexts.size();
325 for (ThreadID tid = 0; tid < size; ++tid) {
326 ThreadContext *tc = threadContexts[tid];
327
328 /** This is so that contextId and cpuId match where there is a
329 * 1cpu:1context relationship. Otherwise, the order of registration
330 * could affect the assignment and cpu 1 could have context id 3, for
331 * example. We may even want to do something like this for SMT so that
332 * cpu 0 has the lowest thread contexts and cpu N has the highest, but
333 * I'll just do this for now
334 */
335 if (numThreads == 1)
336 tc->setContextId(system->registerThreadContext(tc, _cpuId));
337 else
338 tc->setContextId(system->registerThreadContext(tc));
339
340 if (!FullSystem)
341 tc->getProcessPtr()->assignThreadContext(tc->contextId());
342 }
343}
344
345
346int
347BaseCPU::findContext(ThreadContext *tc)
348{
349 ThreadID size = threadContexts.size();
350 for (ThreadID tid = 0; tid < size; ++tid) {
351 if (tc == threadContexts[tid])
352 return tid;
353 }
354 return 0;
355}
356
357void
358BaseCPU::switchOut()
359{
360 assert(!_switchedOut);
361 _switchedOut = true;
362 if (profileEvent && profileEvent->scheduled())
363 deschedule(profileEvent);
364}
365
366void
367BaseCPU::takeOverFrom(BaseCPU *oldCPU)
368{
369 assert(threadContexts.size() == oldCPU->threadContexts.size());
370 assert(_cpuId == oldCPU->cpuId());
371 assert(_switchedOut);
372 assert(oldCPU != this);
373 _pid = oldCPU->getPid();
374 _taskId = oldCPU->taskId();
375 _switchedOut = false;
376
377 ThreadID size = threadContexts.size();
378 for (ThreadID i = 0; i < size; ++i) {
379 ThreadContext *newTC = threadContexts[i];
380 ThreadContext *oldTC = oldCPU->threadContexts[i];
381
382 newTC->takeOverFrom(oldTC);
383
384 CpuEvent::replaceThreadContext(oldTC, newTC);
385
386 assert(newTC->contextId() == oldTC->contextId());
387 assert(newTC->threadId() == oldTC->threadId());
388 system->replaceThreadContext(newTC, newTC->contextId());
389
390 /* This code no longer works since the zero register (e.g.,
391 * r31 on Alpha) doesn't necessarily contain zero at this
392 * point.
393 if (DTRACE(Context))
394 ThreadContext::compare(oldTC, newTC);
395 */
396
397 BaseMasterPort *old_itb_port = oldTC->getITBPtr()->getMasterPort();
398 BaseMasterPort *old_dtb_port = oldTC->getDTBPtr()->getMasterPort();
399 BaseMasterPort *new_itb_port = newTC->getITBPtr()->getMasterPort();
400 BaseMasterPort *new_dtb_port = newTC->getDTBPtr()->getMasterPort();
401
402 // Move over any table walker ports if they exist
403 if (new_itb_port) {
404 assert(!new_itb_port->isConnected());
405 assert(old_itb_port);
406 assert(old_itb_port->isConnected());
407 BaseSlavePort &slavePort = old_itb_port->getSlavePort();
408 old_itb_port->unbind();
409 new_itb_port->bind(slavePort);
410 }
411 if (new_dtb_port) {
412 assert(!new_dtb_port->isConnected());
413 assert(old_dtb_port);
414 assert(old_dtb_port->isConnected());
415 BaseSlavePort &slavePort = old_dtb_port->getSlavePort();
416 old_dtb_port->unbind();
417 new_dtb_port->bind(slavePort);
418 }
419
420 // Checker whether or not we have to transfer CheckerCPU
421 // objects over in the switch
422 CheckerCPU *oldChecker = oldTC->getCheckerCpuPtr();
423 CheckerCPU *newChecker = newTC->getCheckerCpuPtr();
424 if (oldChecker && newChecker) {
425 BaseMasterPort *old_checker_itb_port =
426 oldChecker->getITBPtr()->getMasterPort();
427 BaseMasterPort *old_checker_dtb_port =
428 oldChecker->getDTBPtr()->getMasterPort();
429 BaseMasterPort *new_checker_itb_port =
430 newChecker->getITBPtr()->getMasterPort();
431 BaseMasterPort *new_checker_dtb_port =
432 newChecker->getDTBPtr()->getMasterPort();
433
434 // Move over any table walker ports if they exist for checker
435 if (new_checker_itb_port) {
436 assert(!new_checker_itb_port->isConnected());
437 assert(old_checker_itb_port);
438 assert(old_checker_itb_port->isConnected());
439 BaseSlavePort &slavePort =
440 old_checker_itb_port->getSlavePort();
441 old_checker_itb_port->unbind();
442 new_checker_itb_port->bind(slavePort);
443 }
444 if (new_checker_dtb_port) {
445 assert(!new_checker_dtb_port->isConnected());
446 assert(old_checker_dtb_port);
447 assert(old_checker_dtb_port->isConnected());
448 BaseSlavePort &slavePort =
449 old_checker_dtb_port->getSlavePort();
450 old_checker_dtb_port->unbind();
451 new_checker_dtb_port->bind(slavePort);
452 }
453 }
454 }
455
456 interrupts = oldCPU->interrupts;
457 interrupts->setCPU(this);
458 oldCPU->interrupts = NULL;
459
460 if (FullSystem) {
461 for (ThreadID i = 0; i < size; ++i)
462 threadContexts[i]->profileClear();
463
464 if (profileEvent)
465 schedule(profileEvent, curTick());
466 }
467
468 // All CPUs have an instruction and a data port, and the new CPU's
469 // ports are dangling while the old CPU has its ports connected
470 // already. Unbind the old CPU and then bind the ports of the one
471 // we are switching to.
472 assert(!getInstPort().isConnected());
473 assert(oldCPU->getInstPort().isConnected());
474 BaseSlavePort &inst_peer_port = oldCPU->getInstPort().getSlavePort();
475 oldCPU->getInstPort().unbind();
476 getInstPort().bind(inst_peer_port);
477
478 assert(!getDataPort().isConnected());
479 assert(oldCPU->getDataPort().isConnected());
480 BaseSlavePort &data_peer_port = oldCPU->getDataPort().getSlavePort();
481 oldCPU->getDataPort().unbind();
482 getDataPort().bind(data_peer_port);
483}
484
485
486BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, Tick _interval)
487 : cpu(_cpu), interval(_interval)
488{ }
489
490void
491BaseCPU::ProfileEvent::process()
492{
493 ThreadID size = cpu->threadContexts.size();
494 for (ThreadID i = 0; i < size; ++i) {
495 ThreadContext *tc = cpu->threadContexts[i];
496 tc->profileSample();
497 }
498
499 cpu->schedule(this, curTick() + interval);
500}
501
502void
503BaseCPU::serialize(std::ostream &os)
504{
505 SERIALIZE_SCALAR(instCnt);
506
507 /* Unlike _pid, _taskId is not serialized, as they are dynamically
508 * assigned unique ids that are only meaningful for the duration of
509 * a specific run. We will need to serialize the entire taskMap in
510 * system. */
511 SERIALIZE_SCALAR(_pid);
512
513 interrupts->serialize(os);
514}
515
516void
517BaseCPU::unserialize(Checkpoint *cp, const std::string §ion)
518{
519 UNSERIALIZE_SCALAR(instCnt);
520 UNSERIALIZE_SCALAR(_pid);
521 interrupts->unserialize(cp, section);
522}
523
524void
525BaseCPU::traceFunctionsInternal(Addr pc)
526{
527 if (!debugSymbolTable)
528 return;
529
530 // if pc enters different function, print new function symbol and
531 // update saved range. Otherwise do nothing.
532 if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
533 string sym_str;
534 bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
535 currentFunctionStart,
536 currentFunctionEnd);
537
538 if (!found) {
539 // no symbol found: use addr as label
540 sym_str = csprintf("0x%x", pc);
541 currentFunctionStart = pc;
542 currentFunctionEnd = pc + 1;
543 }
544
545 ccprintf(*functionTraceStream, " (%d)\n%d: %s",
546 curTick() - functionEntryTick, curTick(), sym_str);
547 functionEntryTick = curTick();
548 }
549}
550
551bool
552BaseCPU::CpuPort::recvTimingResp(PacketPtr pkt)
553{
554 panic("BaseCPU doesn't expect recvTiming!\n");
555 return true;
556}
557
558void
559BaseCPU::CpuPort::recvRetry()
560{
561 panic("BaseCPU doesn't expect recvRetry!\n");
562}
563
564void
565BaseCPU::CpuPort::recvFunctionalSnoop(PacketPtr pkt)
566{
567 // No internal storage to update (in the general case). A CPU with
568 // internal storage, e.g. an LSQ that should be part of the
569 // coherent memory has to check against stored data.
570}
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) 2002-2005 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: Steve Reinhardt
42 * Nathan Binkert
43 * Rick Strong
44 */
45
46#include <iostream>
47#include <sstream>
48#include <string>
49
50#include "arch/tlb.hh"
51#include "base/loader/symtab.hh"
52#include "base/cprintf.hh"
53#include "base/misc.hh"
54#include "base/output.hh"
55#include "base/trace.hh"
56#include "cpu/base.hh"
57#include "cpu/checker/cpu.hh"
58#include "cpu/cpuevent.hh"
59#include "cpu/profile.hh"
60#include "cpu/thread_context.hh"
61#include "debug/SyscallVerbose.hh"
62#include "params/BaseCPU.hh"
63#include "sim/full_system.hh"
64#include "sim/process.hh"
65#include "sim/sim_events.hh"
66#include "sim/sim_exit.hh"
67#include "sim/system.hh"
68
69// Hack
70#include "sim/stat_control.hh"
71
72using namespace std;
73
74vector<BaseCPU *> BaseCPU::cpuList;
75
76// This variable reflects the max number of threads in any CPU. Be
77// careful to only use it once all the CPUs that you care about have
78// been initialized
79int maxThreadsPerCPU = 1;
80
81CPUProgressEvent::CPUProgressEvent(BaseCPU *_cpu, Tick ival)
82 : Event(Event::Progress_Event_Pri), _interval(ival), lastNumInst(0),
83 cpu(_cpu), _repeatEvent(true)
84{
85 if (_interval)
86 cpu->schedule(this, curTick() + _interval);
87}
88
89void
90CPUProgressEvent::process()
91{
92 Counter temp = cpu->totalOps();
93#ifndef NDEBUG
94 double ipc = double(temp - lastNumInst) / (_interval / cpu->clockPeriod());
95
96 DPRINTFN("%s progress event, total committed:%i, progress insts committed: "
97 "%lli, IPC: %0.8d\n", cpu->name(), temp, temp - lastNumInst,
98 ipc);
99 ipc = 0.0;
100#else
101 cprintf("%lli: %s progress event, total committed:%i, progress insts "
102 "committed: %lli\n", curTick(), cpu->name(), temp,
103 temp - lastNumInst);
104#endif
105 lastNumInst = temp;
106
107 if (_repeatEvent)
108 cpu->schedule(this, curTick() + _interval);
109}
110
111const char *
112CPUProgressEvent::description() const
113{
114 return "CPU Progress";
115}
116
117BaseCPU::BaseCPU(Params *p, bool is_checker)
118 : MemObject(p), instCnt(0), _cpuId(p->cpu_id),
119 _instMasterId(p->system->getMasterId(name() + ".inst")),
120 _dataMasterId(p->system->getMasterId(name() + ".data")),
121 _taskId(ContextSwitchTaskId::Unknown), _pid(Request::invldPid),
122 _switchedOut(p->defer_registration),
123 interrupts(p->interrupts), profileEvent(NULL),
124 numThreads(p->numThreads), system(p->system)
125{
126 // if Python did not provide a valid ID, do it here
127 if (_cpuId == -1 ) {
128 _cpuId = cpuList.size();
129 }
130
131 // add self to global list of CPUs
132 cpuList.push_back(this);
133
134 DPRINTF(SyscallVerbose, "Constructing CPU with id %d\n", _cpuId);
135
136 if (numThreads > maxThreadsPerCPU)
137 maxThreadsPerCPU = numThreads;
138
139 // allocate per-thread instruction-based event queues
140 comInstEventQueue = new EventQueue *[numThreads];
141 for (ThreadID tid = 0; tid < numThreads; ++tid)
142 comInstEventQueue[tid] =
143 new EventQueue("instruction-based event queue");
144
145 //
146 // set up instruction-count-based termination events, if any
147 //
148 if (p->max_insts_any_thread != 0) {
149 const char *cause = "a thread reached the max instruction count";
150 for (ThreadID tid = 0; tid < numThreads; ++tid) {
151 Event *event = new SimLoopExitEvent(cause, 0);
152 comInstEventQueue[tid]->schedule(event, p->max_insts_any_thread);
153 }
154 }
155
156 if (p->max_insts_all_threads != 0) {
157 const char *cause = "all threads reached the max instruction count";
158
159 // allocate & initialize shared downcounter: each event will
160 // decrement this when triggered; simulation will terminate
161 // when counter reaches 0
162 int *counter = new int;
163 *counter = numThreads;
164 for (ThreadID tid = 0; tid < numThreads; ++tid) {
165 Event *event = new CountedExitEvent(cause, *counter);
166 comInstEventQueue[tid]->schedule(event, p->max_insts_all_threads);
167 }
168 }
169
170 // allocate per-thread load-based event queues
171 comLoadEventQueue = new EventQueue *[numThreads];
172 for (ThreadID tid = 0; tid < numThreads; ++tid)
173 comLoadEventQueue[tid] = new EventQueue("load-based event queue");
174
175 //
176 // set up instruction-count-based termination events, if any
177 //
178 if (p->max_loads_any_thread != 0) {
179 const char *cause = "a thread reached the max load count";
180 for (ThreadID tid = 0; tid < numThreads; ++tid) {
181 Event *event = new SimLoopExitEvent(cause, 0);
182 comLoadEventQueue[tid]->schedule(event, p->max_loads_any_thread);
183 }
184 }
185
186 if (p->max_loads_all_threads != 0) {
187 const char *cause = "all threads reached the max load count";
188 // allocate & initialize shared downcounter: each event will
189 // decrement this when triggered; simulation will terminate
190 // when counter reaches 0
191 int *counter = new int;
192 *counter = numThreads;
193 for (ThreadID tid = 0; tid < numThreads; ++tid) {
194 Event *event = new CountedExitEvent(cause, *counter);
195 comLoadEventQueue[tid]->schedule(event, p->max_loads_all_threads);
196 }
197 }
198
199 functionTracingEnabled = false;
200 if (p->function_trace) {
201 const string fname = csprintf("ftrace.%s", name());
202 functionTraceStream = simout.find(fname);
203 if (!functionTraceStream)
204 functionTraceStream = simout.create(fname);
205
206 currentFunctionStart = currentFunctionEnd = 0;
207 functionEntryTick = p->function_trace_start;
208
209 if (p->function_trace_start == 0) {
210 functionTracingEnabled = true;
211 } else {
212 typedef EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace> wrap;
213 Event *event = new wrap(this, true);
214 schedule(event, p->function_trace_start);
215 }
216 }
217
218 // The interrupts should always be present unless this CPU is
219 // switched in later or in case it is a checker CPU
220 if (!params()->defer_registration && !is_checker) {
221 if (interrupts) {
222 interrupts->setCPU(this);
223 } else {
224 fatal("CPU %s has no interrupt controller.\n"
225 "Ensure createInterruptController() is called.\n", name());
226 }
227 }
228
229 if (FullSystem) {
230 if (params()->profile)
231 profileEvent = new ProfileEvent(this, params()->profile);
232 }
233 tracer = params()->tracer;
234
235 if (params()->isa.size() != numThreads) {
236 fatal("Number of ISAs (%i) assigned to the CPU does not equal number "
237 "of threads (%i).\n", params()->isa.size(), numThreads);
238 }
239}
240
241void
242BaseCPU::enableFunctionTrace()
243{
244 functionTracingEnabled = true;
245}
246
247BaseCPU::~BaseCPU()
248{
249 delete profileEvent;
250 delete[] comLoadEventQueue;
251 delete[] comInstEventQueue;
252}
253
254void
255BaseCPU::init()
256{
257 if (!params()->defer_registration)
258 registerThreadContexts();
259}
260
261void
262BaseCPU::startup()
263{
264 if (FullSystem) {
265 if (!params()->defer_registration && profileEvent)
266 schedule(profileEvent, curTick());
267 }
268
269 if (params()->progress_interval) {
270 new CPUProgressEvent(this, params()->progress_interval);
271 }
272}
273
274
275void
276BaseCPU::regStats()
277{
278 using namespace Stats;
279
280 numCycles
281 .name(name() + ".numCycles")
282 .desc("number of cpu cycles simulated")
283 ;
284
285 numWorkItemsStarted
286 .name(name() + ".numWorkItemsStarted")
287 .desc("number of work items this cpu started")
288 ;
289
290 numWorkItemsCompleted
291 .name(name() + ".numWorkItemsCompleted")
292 .desc("number of work items this cpu completed")
293 ;
294
295 int size = threadContexts.size();
296 if (size > 1) {
297 for (int i = 0; i < size; ++i) {
298 stringstream namestr;
299 ccprintf(namestr, "%s.ctx%d", name(), i);
300 threadContexts[i]->regStats(namestr.str());
301 }
302 } else if (size == 1)
303 threadContexts[0]->regStats(name());
304}
305
306BaseMasterPort &
307BaseCPU::getMasterPort(const string &if_name, PortID idx)
308{
309 // Get the right port based on name. This applies to all the
310 // subclasses of the base CPU and relies on their implementation
311 // of getDataPort and getInstPort. In all cases there methods
312 // return a CpuPort pointer.
313 if (if_name == "dcache_port")
314 return getDataPort();
315 else if (if_name == "icache_port")
316 return getInstPort();
317 else
318 return MemObject::getMasterPort(if_name, idx);
319}
320
321void
322BaseCPU::registerThreadContexts()
323{
324 ThreadID size = threadContexts.size();
325 for (ThreadID tid = 0; tid < size; ++tid) {
326 ThreadContext *tc = threadContexts[tid];
327
328 /** This is so that contextId and cpuId match where there is a
329 * 1cpu:1context relationship. Otherwise, the order of registration
330 * could affect the assignment and cpu 1 could have context id 3, for
331 * example. We may even want to do something like this for SMT so that
332 * cpu 0 has the lowest thread contexts and cpu N has the highest, but
333 * I'll just do this for now
334 */
335 if (numThreads == 1)
336 tc->setContextId(system->registerThreadContext(tc, _cpuId));
337 else
338 tc->setContextId(system->registerThreadContext(tc));
339
340 if (!FullSystem)
341 tc->getProcessPtr()->assignThreadContext(tc->contextId());
342 }
343}
344
345
346int
347BaseCPU::findContext(ThreadContext *tc)
348{
349 ThreadID size = threadContexts.size();
350 for (ThreadID tid = 0; tid < size; ++tid) {
351 if (tc == threadContexts[tid])
352 return tid;
353 }
354 return 0;
355}
356
357void
358BaseCPU::switchOut()
359{
360 assert(!_switchedOut);
361 _switchedOut = true;
362 if (profileEvent && profileEvent->scheduled())
363 deschedule(profileEvent);
364}
365
366void
367BaseCPU::takeOverFrom(BaseCPU *oldCPU)
368{
369 assert(threadContexts.size() == oldCPU->threadContexts.size());
370 assert(_cpuId == oldCPU->cpuId());
371 assert(_switchedOut);
372 assert(oldCPU != this);
373 _pid = oldCPU->getPid();
374 _taskId = oldCPU->taskId();
375 _switchedOut = false;
376
377 ThreadID size = threadContexts.size();
378 for (ThreadID i = 0; i < size; ++i) {
379 ThreadContext *newTC = threadContexts[i];
380 ThreadContext *oldTC = oldCPU->threadContexts[i];
381
382 newTC->takeOverFrom(oldTC);
383
384 CpuEvent::replaceThreadContext(oldTC, newTC);
385
386 assert(newTC->contextId() == oldTC->contextId());
387 assert(newTC->threadId() == oldTC->threadId());
388 system->replaceThreadContext(newTC, newTC->contextId());
389
390 /* This code no longer works since the zero register (e.g.,
391 * r31 on Alpha) doesn't necessarily contain zero at this
392 * point.
393 if (DTRACE(Context))
394 ThreadContext::compare(oldTC, newTC);
395 */
396
397 BaseMasterPort *old_itb_port = oldTC->getITBPtr()->getMasterPort();
398 BaseMasterPort *old_dtb_port = oldTC->getDTBPtr()->getMasterPort();
399 BaseMasterPort *new_itb_port = newTC->getITBPtr()->getMasterPort();
400 BaseMasterPort *new_dtb_port = newTC->getDTBPtr()->getMasterPort();
401
402 // Move over any table walker ports if they exist
403 if (new_itb_port) {
404 assert(!new_itb_port->isConnected());
405 assert(old_itb_port);
406 assert(old_itb_port->isConnected());
407 BaseSlavePort &slavePort = old_itb_port->getSlavePort();
408 old_itb_port->unbind();
409 new_itb_port->bind(slavePort);
410 }
411 if (new_dtb_port) {
412 assert(!new_dtb_port->isConnected());
413 assert(old_dtb_port);
414 assert(old_dtb_port->isConnected());
415 BaseSlavePort &slavePort = old_dtb_port->getSlavePort();
416 old_dtb_port->unbind();
417 new_dtb_port->bind(slavePort);
418 }
419
420 // Checker whether or not we have to transfer CheckerCPU
421 // objects over in the switch
422 CheckerCPU *oldChecker = oldTC->getCheckerCpuPtr();
423 CheckerCPU *newChecker = newTC->getCheckerCpuPtr();
424 if (oldChecker && newChecker) {
425 BaseMasterPort *old_checker_itb_port =
426 oldChecker->getITBPtr()->getMasterPort();
427 BaseMasterPort *old_checker_dtb_port =
428 oldChecker->getDTBPtr()->getMasterPort();
429 BaseMasterPort *new_checker_itb_port =
430 newChecker->getITBPtr()->getMasterPort();
431 BaseMasterPort *new_checker_dtb_port =
432 newChecker->getDTBPtr()->getMasterPort();
433
434 // Move over any table walker ports if they exist for checker
435 if (new_checker_itb_port) {
436 assert(!new_checker_itb_port->isConnected());
437 assert(old_checker_itb_port);
438 assert(old_checker_itb_port->isConnected());
439 BaseSlavePort &slavePort =
440 old_checker_itb_port->getSlavePort();
441 old_checker_itb_port->unbind();
442 new_checker_itb_port->bind(slavePort);
443 }
444 if (new_checker_dtb_port) {
445 assert(!new_checker_dtb_port->isConnected());
446 assert(old_checker_dtb_port);
447 assert(old_checker_dtb_port->isConnected());
448 BaseSlavePort &slavePort =
449 old_checker_dtb_port->getSlavePort();
450 old_checker_dtb_port->unbind();
451 new_checker_dtb_port->bind(slavePort);
452 }
453 }
454 }
455
456 interrupts = oldCPU->interrupts;
457 interrupts->setCPU(this);
458 oldCPU->interrupts = NULL;
459
460 if (FullSystem) {
461 for (ThreadID i = 0; i < size; ++i)
462 threadContexts[i]->profileClear();
463
464 if (profileEvent)
465 schedule(profileEvent, curTick());
466 }
467
468 // All CPUs have an instruction and a data port, and the new CPU's
469 // ports are dangling while the old CPU has its ports connected
470 // already. Unbind the old CPU and then bind the ports of the one
471 // we are switching to.
472 assert(!getInstPort().isConnected());
473 assert(oldCPU->getInstPort().isConnected());
474 BaseSlavePort &inst_peer_port = oldCPU->getInstPort().getSlavePort();
475 oldCPU->getInstPort().unbind();
476 getInstPort().bind(inst_peer_port);
477
478 assert(!getDataPort().isConnected());
479 assert(oldCPU->getDataPort().isConnected());
480 BaseSlavePort &data_peer_port = oldCPU->getDataPort().getSlavePort();
481 oldCPU->getDataPort().unbind();
482 getDataPort().bind(data_peer_port);
483}
484
485
486BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, Tick _interval)
487 : cpu(_cpu), interval(_interval)
488{ }
489
490void
491BaseCPU::ProfileEvent::process()
492{
493 ThreadID size = cpu->threadContexts.size();
494 for (ThreadID i = 0; i < size; ++i) {
495 ThreadContext *tc = cpu->threadContexts[i];
496 tc->profileSample();
497 }
498
499 cpu->schedule(this, curTick() + interval);
500}
501
502void
503BaseCPU::serialize(std::ostream &os)
504{
505 SERIALIZE_SCALAR(instCnt);
506
507 /* Unlike _pid, _taskId is not serialized, as they are dynamically
508 * assigned unique ids that are only meaningful for the duration of
509 * a specific run. We will need to serialize the entire taskMap in
510 * system. */
511 SERIALIZE_SCALAR(_pid);
512
513 interrupts->serialize(os);
514}
515
516void
517BaseCPU::unserialize(Checkpoint *cp, const std::string §ion)
518{
519 UNSERIALIZE_SCALAR(instCnt);
520 UNSERIALIZE_SCALAR(_pid);
521 interrupts->unserialize(cp, section);
522}
523
524void
525BaseCPU::traceFunctionsInternal(Addr pc)
526{
527 if (!debugSymbolTable)
528 return;
529
530 // if pc enters different function, print new function symbol and
531 // update saved range. Otherwise do nothing.
532 if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
533 string sym_str;
534 bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
535 currentFunctionStart,
536 currentFunctionEnd);
537
538 if (!found) {
539 // no symbol found: use addr as label
540 sym_str = csprintf("0x%x", pc);
541 currentFunctionStart = pc;
542 currentFunctionEnd = pc + 1;
543 }
544
545 ccprintf(*functionTraceStream, " (%d)\n%d: %s",
546 curTick() - functionEntryTick, curTick(), sym_str);
547 functionEntryTick = curTick();
548 }
549}
550
551bool
552BaseCPU::CpuPort::recvTimingResp(PacketPtr pkt)
553{
554 panic("BaseCPU doesn't expect recvTiming!\n");
555 return true;
556}
557
558void
559BaseCPU::CpuPort::recvRetry()
560{
561 panic("BaseCPU doesn't expect recvRetry!\n");
562}
563
564void
565BaseCPU::CpuPort::recvFunctionalSnoop(PacketPtr pkt)
566{
567 // No internal storage to update (in the general case). A CPU with
568 // internal storage, e.g. an LSQ that should be part of the
569 // coherent memory has to check against stored data.
570}