cpu_impl.hh revision 12104:edd63f9c6184
1/*
2 * Copyright (c) 2011 ARM Limited
3 * Copyright (c) 2013 Advanced Micro Devices, Inc.
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder.  You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2006 The Regents of The University of Michigan
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 *          Geoffrey Blake
43 */
44
45#ifndef __CPU_CHECKER_CPU_IMPL_HH__
46#define __CPU_CHECKER_CPU_IMPL_HH__
47
48#include <list>
49#include <string>
50
51#include "arch/isa_traits.hh"
52#include "arch/vtophys.hh"
53#include "base/refcnt.hh"
54#include "config/the_isa.hh"
55#include "cpu/base_dyn_inst.hh"
56#include "cpu/exetrace.hh"
57#include "cpu/reg_class.hh"
58#include "cpu/simple_thread.hh"
59#include "cpu/static_inst.hh"
60#include "cpu/thread_context.hh"
61#include "cpu/checker/cpu.hh"
62#include "debug/Checker.hh"
63#include "sim/full_system.hh"
64#include "sim/sim_object.hh"
65#include "sim/stats.hh"
66
67using namespace std;
68using namespace TheISA;
69
70template <class Impl>
71void
72Checker<Impl>::advancePC(const Fault &fault)
73{
74    if (fault != NoFault) {
75        curMacroStaticInst = StaticInst::nullStaticInstPtr;
76        fault->invoke(tc, curStaticInst);
77        thread->decoder.reset();
78    } else {
79        if (curStaticInst) {
80            if (curStaticInst->isLastMicroop())
81                curMacroStaticInst = StaticInst::nullStaticInstPtr;
82            TheISA::PCState pcState = thread->pcState();
83            TheISA::advancePC(pcState, curStaticInst);
84            thread->pcState(pcState);
85            DPRINTF(Checker, "Advancing PC to %s.\n", thread->pcState());
86        }
87    }
88}
89//////////////////////////////////////////////////
90
91template <class Impl>
92void
93Checker<Impl>::handlePendingInt()
94{
95    DPRINTF(Checker, "IRQ detected at PC: %s with %d insts in buffer\n",
96                     thread->pcState(), instList.size());
97    DynInstPtr boundaryInst = NULL;
98    if (!instList.empty()) {
99        // Set the instructions as completed and verify as much as possible.
100        DynInstPtr inst;
101        typename std::list<DynInstPtr>::iterator itr;
102
103        for (itr = instList.begin(); itr != instList.end(); itr++) {
104            (*itr)->setCompleted();
105        }
106
107        inst = instList.front();
108        boundaryInst = instList.back();
109        verify(inst); // verify the instructions
110        inst = NULL;
111    }
112    if ((!boundaryInst && curMacroStaticInst &&
113          curStaticInst->isDelayedCommit() &&
114          !curStaticInst->isLastMicroop()) ||
115        (boundaryInst && boundaryInst->isDelayedCommit() &&
116         !boundaryInst->isLastMicroop())) {
117        panic("%lli: Trying to take an interrupt in middle of "
118              "a non-interuptable instruction!", curTick());
119    }
120    boundaryInst = NULL;
121    thread->decoder.reset();
122    curMacroStaticInst = StaticInst::nullStaticInstPtr;
123}
124
125template <class Impl>
126void
127Checker<Impl>::verify(DynInstPtr &completed_inst)
128{
129    DynInstPtr inst;
130
131    // Make sure serializing instructions are actually
132    // seen as serializing to commit. instList should be
133    // empty in these cases.
134    if ((completed_inst->isSerializing() ||
135        completed_inst->isSerializeBefore()) &&
136        (!instList.empty() ?
137         (instList.front()->seqNum != completed_inst->seqNum) : 0)) {
138        panic("%lli: Instruction sn:%lli at PC %s is serializing before but is"
139              " entering instList with other instructions\n", curTick(),
140              completed_inst->seqNum, completed_inst->pcState());
141    }
142
143    // Either check this instruction, or add it to a list of
144    // instructions waiting to be checked.  Instructions must be
145    // checked in program order, so if a store has committed yet not
146    // completed, there may be some instructions that are waiting
147    // behind it that have completed and must be checked.
148    if (!instList.empty()) {
149        if (youngestSN < completed_inst->seqNum) {
150            DPRINTF(Checker, "Adding instruction [sn:%lli] PC:%s to list\n",
151                    completed_inst->seqNum, completed_inst->pcState());
152            instList.push_back(completed_inst);
153            youngestSN = completed_inst->seqNum;
154        }
155
156        if (!instList.front()->isCompleted()) {
157            return;
158        } else {
159            inst = instList.front();
160            instList.pop_front();
161        }
162    } else {
163        if (!completed_inst->isCompleted()) {
164            if (youngestSN < completed_inst->seqNum) {
165                DPRINTF(Checker, "Adding instruction [sn:%lli] PC:%s to list\n",
166                        completed_inst->seqNum, completed_inst->pcState());
167                instList.push_back(completed_inst);
168                youngestSN = completed_inst->seqNum;
169            }
170            return;
171        } else {
172            if (youngestSN < completed_inst->seqNum) {
173                inst = completed_inst;
174                youngestSN = completed_inst->seqNum;
175            } else {
176                return;
177            }
178        }
179    }
180
181    // Make sure a serializing instruction is actually seen as
182    // serializing. instList should be empty here
183    if (inst->isSerializeAfter() && !instList.empty()) {
184        panic("%lli: Instruction sn:%lli at PC %s is serializing after but is"
185             " exiting instList with other instructions\n", curTick(),
186             completed_inst->seqNum, completed_inst->pcState());
187    }
188    unverifiedInst = inst;
189    inst = NULL;
190
191    // Try to check all instructions that are completed, ending if we
192    // run out of instructions to check or if an instruction is not
193    // yet completed.
194    while (1) {
195        DPRINTF(Checker, "Processing instruction [sn:%lli] PC:%s.\n",
196                unverifiedInst->seqNum, unverifiedInst->pcState());
197        unverifiedReq = NULL;
198        unverifiedReq = unverifiedInst->reqToVerify;
199        unverifiedMemData = unverifiedInst->memData;
200        // Make sure results queue is empty
201        while (!result.empty()) {
202            result.pop();
203        }
204        numCycles++;
205
206        Fault fault = NoFault;
207
208        // maintain $r0 semantics
209        thread->setIntReg(ZeroReg, 0);
210#if THE_ISA == ALPHA_ISA
211        thread->setFloatReg(ZeroReg, 0.0);
212#endif
213
214        // Check if any recent PC changes match up with anything we
215        // expect to happen.  This is mostly to check if traps or
216        // PC-based events have occurred in both the checker and CPU.
217        if (changedPC) {
218            DPRINTF(Checker, "Changed PC recently to %s\n",
219                    thread->pcState());
220            if (willChangePC) {
221                if (newPCState == thread->pcState()) {
222                    DPRINTF(Checker, "Changed PC matches expected PC\n");
223                } else {
224                    warn("%lli: Changed PC does not match expected PC, "
225                         "changed: %s, expected: %s",
226                         curTick(), thread->pcState(), newPCState);
227                    CheckerCPU::handleError();
228                }
229                willChangePC = false;
230            }
231            changedPC = false;
232        }
233
234        // Try to fetch the instruction
235        uint64_t fetchOffset = 0;
236        bool fetchDone = false;
237
238        while (!fetchDone) {
239            Addr fetch_PC = thread->instAddr();
240            fetch_PC = (fetch_PC & PCMask) + fetchOffset;
241
242            MachInst machInst;
243
244            // If not in the middle of a macro instruction
245            if (!curMacroStaticInst) {
246                // set up memory request for instruction fetch
247                memReq = new Request(unverifiedInst->threadNumber, fetch_PC,
248                                     sizeof(MachInst),
249                                     0,
250                                     masterId,
251                                     fetch_PC, thread->contextId());
252                memReq->setVirt(0, fetch_PC, sizeof(MachInst),
253                                Request::INST_FETCH, masterId, thread->instAddr());
254
255
256                fault = itb->translateFunctional(memReq, tc, BaseTLB::Execute);
257
258                if (fault != NoFault) {
259                    if (unverifiedInst->getFault() == NoFault) {
260                        // In this case the instruction was not a dummy
261                        // instruction carrying an ITB fault.  In the single
262                        // threaded case the ITB should still be able to
263                        // translate this instruction; in the SMT case it's
264                        // possible that its ITB entry was kicked out.
265                        warn("%lli: Instruction PC %s was not found in the "
266                             "ITB!", curTick(), thread->pcState());
267                        handleError(unverifiedInst);
268
269                        // go to the next instruction
270                        advancePC(NoFault);
271
272                        // Give up on an ITB fault..
273                        delete memReq;
274                        unverifiedInst = NULL;
275                        return;
276                    } else {
277                        // The instruction is carrying an ITB fault.  Handle
278                        // the fault and see if our results match the CPU on
279                        // the next tick().
280                        fault = unverifiedInst->getFault();
281                        delete memReq;
282                        break;
283                    }
284                } else {
285                    PacketPtr pkt = new Packet(memReq, MemCmd::ReadReq);
286
287                    pkt->dataStatic(&machInst);
288                    icachePort->sendFunctional(pkt);
289                    machInst = gtoh(machInst);
290
291                    delete memReq;
292                    delete pkt;
293                }
294            }
295
296            if (fault == NoFault) {
297                TheISA::PCState pcState = thread->pcState();
298
299                if (isRomMicroPC(pcState.microPC())) {
300                    fetchDone = true;
301                    curStaticInst =
302                        microcodeRom.fetchMicroop(pcState.microPC(), NULL);
303                } else if (!curMacroStaticInst) {
304                    //We're not in the middle of a macro instruction
305                    StaticInstPtr instPtr = nullptr;
306
307                    //Predecode, ie bundle up an ExtMachInst
308                    //If more fetch data is needed, pass it in.
309                    Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset;
310                    thread->decoder.moreBytes(pcState, fetchPC, machInst);
311
312                    //If an instruction is ready, decode it.
313                    //Otherwise, we'll have to fetch beyond the
314                    //MachInst at the current pc.
315                    if (thread->decoder.instReady()) {
316                        fetchDone = true;
317                        instPtr = thread->decoder.decode(pcState);
318                        thread->pcState(pcState);
319                    } else {
320                        fetchDone = false;
321                        fetchOffset += sizeof(TheISA::MachInst);
322                    }
323
324                    //If we decoded an instruction and it's microcoded,
325                    //start pulling out micro ops
326                    if (instPtr && instPtr->isMacroop()) {
327                        curMacroStaticInst = instPtr;
328                        curStaticInst =
329                            instPtr->fetchMicroop(pcState.microPC());
330                    } else {
331                        curStaticInst = instPtr;
332                    }
333                } else {
334                    // Read the next micro op from the macro-op
335                    curStaticInst =
336                        curMacroStaticInst->fetchMicroop(pcState.microPC());
337                    fetchDone = true;
338                }
339            }
340        }
341        // reset decoder on Checker
342        thread->decoder.reset();
343
344        // Check Checker and CPU get same instruction, and record
345        // any faults the CPU may have had.
346        Fault unverifiedFault;
347        if (fault == NoFault) {
348            unverifiedFault = unverifiedInst->getFault();
349
350            // Checks that the instruction matches what we expected it to be.
351            // Checks both the machine instruction and the PC.
352            validateInst(unverifiedInst);
353        }
354
355        // keep an instruction count
356        numInst++;
357
358
359        // Either the instruction was a fault and we should process the fault,
360        // or we should just go ahead execute the instruction.  This assumes
361        // that the instruction is properly marked as a fault.
362        if (fault == NoFault) {
363            // Execute Checker instruction and trace
364            if (!unverifiedInst->isUnverifiable()) {
365                Trace::InstRecord *traceData = tracer->getInstRecord(curTick(),
366                                                           tc,
367                                                           curStaticInst,
368                                                           pcState(),
369                                                           curMacroStaticInst);
370                fault = curStaticInst->execute(this, traceData);
371                if (traceData) {
372                    traceData->dump();
373                    delete traceData;
374                }
375            }
376
377            if (fault == NoFault && unverifiedFault == NoFault) {
378                thread->funcExeInst++;
379                // Checks to make sure instrution results are correct.
380                validateExecution(unverifiedInst);
381
382                if (curStaticInst->isLoad()) {
383                    ++numLoad;
384                }
385            } else if (fault != NoFault && unverifiedFault == NoFault) {
386                panic("%lli: sn: %lli at PC: %s took a fault in checker "
387                      "but not in driver CPU\n", curTick(),
388                      unverifiedInst->seqNum, unverifiedInst->pcState());
389            } else if (fault == NoFault && unverifiedFault != NoFault) {
390                panic("%lli: sn: %lli at PC: %s took a fault in driver "
391                      "CPU but not in checker\n", curTick(),
392                      unverifiedInst->seqNum, unverifiedInst->pcState());
393            }
394        }
395
396        // Take any faults here
397        if (fault != NoFault) {
398            if (FullSystem) {
399                fault->invoke(tc, curStaticInst);
400                willChangePC = true;
401                newPCState = thread->pcState();
402                DPRINTF(Checker, "Fault, PC is now %s\n", newPCState);
403                curMacroStaticInst = StaticInst::nullStaticInstPtr;
404            }
405        } else {
406           advancePC(fault);
407        }
408
409        if (FullSystem) {
410            // @todo: Determine if these should happen only if the
411            // instruction hasn't faulted.  In the SimpleCPU case this may
412            // not be true, but in the O3 case this may be true.
413            Addr oldpc;
414            int count = 0;
415            do {
416                oldpc = thread->instAddr();
417                system->pcEventQueue.service(tc);
418                count++;
419            } while (oldpc != thread->instAddr());
420            if (count > 1) {
421                willChangePC = true;
422                newPCState = thread->pcState();
423                DPRINTF(Checker, "PC Event, PC is now %s\n", newPCState);
424            }
425        }
426
427        // @todo:  Optionally can check all registers. (Or just those
428        // that have been modified).
429        validateState();
430
431        // Continue verifying instructions if there's another completed
432        // instruction waiting to be verified.
433        if (instList.empty()) {
434            break;
435        } else if (instList.front()->isCompleted()) {
436            unverifiedInst = NULL;
437            unverifiedInst = instList.front();
438            instList.pop_front();
439        } else {
440            break;
441        }
442    }
443    unverifiedInst = NULL;
444}
445
446template <class Impl>
447void
448Checker<Impl>::switchOut()
449{
450    instList.clear();
451}
452
453template <class Impl>
454void
455Checker<Impl>::takeOverFrom(BaseCPU *oldCPU)
456{
457}
458
459template <class Impl>
460void
461Checker<Impl>::validateInst(DynInstPtr &inst)
462{
463    if (inst->instAddr() != thread->instAddr()) {
464        warn("%lli: PCs do not match! Inst: %s, checker: %s",
465             curTick(), inst->pcState(), thread->pcState());
466        if (changedPC) {
467            warn("%lli: Changed PCs recently, may not be an error",
468                 curTick());
469        } else {
470            handleError(inst);
471        }
472    }
473
474    if (curStaticInst != inst->staticInst) {
475        warn("%lli: StaticInstPtrs don't match. (%s, %s).\n", curTick(),
476                curStaticInst->getName(), inst->staticInst->getName());
477    }
478}
479
480template <class Impl>
481void
482Checker<Impl>::validateExecution(DynInstPtr &inst)
483{
484    uint64_t checker_val;
485    uint64_t inst_val;
486    int idx = -1;
487    bool result_mismatch = false;
488
489    if (inst->isUnverifiable()) {
490        // Unverifiable instructions assume they were executed
491        // properly by the CPU. Grab the result from the
492        // instruction and write it to the register.
493        copyResult(inst, 0, idx);
494    } else if (inst->numDestRegs() > 0 && !result.empty()) {
495        DPRINTF(Checker, "Dest regs %d, number of checker dest regs %d\n",
496                         inst->numDestRegs(), result.size());
497        for (int i = 0; i < inst->numDestRegs() && !result.empty(); i++) {
498            result.front().get(checker_val);
499            result.pop();
500            inst_val = 0;
501            inst->template popResult<uint64_t>(inst_val);
502            if (checker_val != inst_val) {
503                result_mismatch = true;
504                idx = i;
505                break;
506            }
507        }
508    } // Checker CPU checks all the saved results in the dyninst passed by
509      // the cpu model being checked against the saved results present in
510      // the static inst executed in the Checker.  Sometimes the number
511      // of saved results differs between the dyninst and static inst, but
512      // this is ok and not a bug.  May be worthwhile to try and correct this.
513
514    if (result_mismatch) {
515        warn("%lli: Instruction results do not match! (Values may not "
516             "actually be integers) Inst: %#x, checker: %#x",
517             curTick(), inst_val, checker_val);
518
519        // It's useful to verify load values from memory, but in MP
520        // systems the value obtained at execute may be different than
521        // the value obtained at completion.  Similarly DMA can
522        // present the same problem on even UP systems.  Thus there is
523        // the option to only warn on loads having a result error.
524        // The load/store queue in Detailed CPU can also cause problems
525        // if load/store forwarding is allowed.
526        if (inst->isLoad() && warnOnlyOnLoadError) {
527            copyResult(inst, inst_val, idx);
528        } else {
529            handleError(inst);
530        }
531    }
532
533    if (inst->nextInstAddr() != thread->nextInstAddr()) {
534        warn("%lli: Instruction next PCs do not match! Inst: %#x, "
535             "checker: %#x",
536             curTick(), inst->nextInstAddr(), thread->nextInstAddr());
537        handleError(inst);
538    }
539
540    // Checking side effect registers can be difficult if they are not
541    // checked simultaneously with the execution of the instruction.
542    // This is because other valid instructions may have modified
543    // these registers in the meantime, and their values are not
544    // stored within the DynInst.
545    while (!miscRegIdxs.empty()) {
546        int misc_reg_idx = miscRegIdxs.front();
547        miscRegIdxs.pop();
548
549        if (inst->tcBase()->readMiscRegNoEffect(misc_reg_idx) !=
550            thread->readMiscRegNoEffect(misc_reg_idx)) {
551            warn("%lli: Misc reg idx %i (side effect) does not match! "
552                 "Inst: %#x, checker: %#x",
553                 curTick(), misc_reg_idx,
554                 inst->tcBase()->readMiscRegNoEffect(misc_reg_idx),
555                 thread->readMiscRegNoEffect(misc_reg_idx));
556            handleError(inst);
557        }
558    }
559}
560
561
562// This function is weird, if it is called it means the Checker and
563// O3 have diverged, so panic is called for now.  It may be useful
564// to resynch states and continue if the divergence is a false positive
565template <class Impl>
566void
567Checker<Impl>::validateState()
568{
569    if (updateThisCycle) {
570        // Change this back to warn if divergences end up being false positives
571        panic("%lli: Instruction PC %#x results didn't match up, copying all "
572             "registers from main CPU", curTick(), unverifiedInst->instAddr());
573
574        // Terribly convoluted way to make sure O3 model does not implode
575        bool no_squash_from_TC = unverifiedInst->thread->noSquashFromTC;
576        unverifiedInst->thread->noSquashFromTC = true;
577
578        // Heavy-weight copying of all registers
579        thread->copyArchRegs(unverifiedInst->tcBase());
580        unverifiedInst->thread->noSquashFromTC = no_squash_from_TC;
581
582        // Set curStaticInst to unverifiedInst->staticInst
583        curStaticInst = unverifiedInst->staticInst;
584        // Also advance the PC.  Hopefully no PC-based events happened.
585        advancePC(NoFault);
586        updateThisCycle = false;
587    }
588}
589
590template <class Impl>
591void
592Checker<Impl>::copyResult(DynInstPtr &inst, uint64_t mismatch_val,
593                          int start_idx)
594{
595    // We've already popped one dest off the queue,
596    // so do the fix-up then start with the next dest reg;
597    if (start_idx >= 0) {
598        RegId idx = inst->destRegIdx(start_idx);
599        switch (idx.regClass) {
600          case IntRegClass:
601            thread->setIntReg(idx.regIdx, mismatch_val);
602            break;
603          case FloatRegClass:
604            thread->setFloatRegBits(idx.regIdx, mismatch_val);
605            break;
606          case CCRegClass:
607            thread->setCCReg(idx.regIdx, mismatch_val);
608            break;
609          case MiscRegClass:
610            thread->setMiscReg(idx.regIdx, mismatch_val);
611            break;
612        }
613    }
614    start_idx++;
615    uint64_t res = 0;
616    for (int i = start_idx; i < inst->numDestRegs(); i++) {
617        RegId idx = inst->destRegIdx(i);
618        inst->template popResult<uint64_t>(res);
619        switch (idx.regClass) {
620          case IntRegClass:
621            thread->setIntReg(idx.regIdx, res);
622            break;
623          case FloatRegClass:
624            thread->setFloatRegBits(idx.regIdx, res);
625            break;
626          case CCRegClass:
627            thread->setCCReg(idx.regIdx, res);
628            break;
629          case MiscRegClass:
630            // Try to get the proper misc register index for ARM here...
631            thread->setMiscReg(idx.regIdx, res);
632            break;
633            // else Register is out of range...
634        }
635    }
636}
637
638template <class Impl>
639void
640Checker<Impl>::dumpAndExit(DynInstPtr &inst)
641{
642    cprintf("Error detected, instruction information:\n");
643    cprintf("PC:%s, nextPC:%#x\n[sn:%lli]\n[tid:%i]\n"
644            "Completed:%i\n",
645            inst->pcState(),
646            inst->nextInstAddr(),
647            inst->seqNum,
648            inst->threadNumber,
649            inst->isCompleted());
650    inst->dump();
651    CheckerCPU::dumpAndExit();
652}
653
654template <class Impl>
655void
656Checker<Impl>::dumpInsts()
657{
658    int num = 0;
659
660    InstListIt inst_list_it = --(instList.end());
661
662    cprintf("Inst list size: %i\n", instList.size());
663
664    while (inst_list_it != instList.end())
665    {
666        cprintf("Instruction:%i\n",
667                num);
668
669        cprintf("PC:%s\n[sn:%lli]\n[tid:%i]\n"
670                "Completed:%i\n",
671                (*inst_list_it)->pcState(),
672                (*inst_list_it)->seqNum,
673                (*inst_list_it)->threadNumber,
674                (*inst_list_it)->isCompleted());
675
676        cprintf("\n");
677
678        inst_list_it--;
679        ++num;
680    }
681
682}
683
684#endif//__CPU_CHECKER_CPU_IMPL_HH__
685