src/cpu/inorder/cpu.hh

   1 /*
   2  * Copyright (c) 2007 MIPS Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Korey Sewell
  29  *
  30  */
  31
  32 #ifndef __CPU_INORDER_CPU_HH__
  33 #define __CPU_INORDER_CPU_HH__
  34
  35 #include <iostream>
  36 #include <list>
  37 #include <queue>
  38 #include <set>
  39 #include <vector>
  40
  41 #include "arch/isa_traits.hh"
  42 #include "arch/types.hh"
  43 #include "base/statistics.hh"
  44 #include "base/timebuf.hh"
  45 #include "base/types.hh"
  46 #include "config/full_system.hh"
  47 #include "cpu/activity.hh"
  48 #include "cpu/base.hh"
  49 #include "cpu/simple_thread.hh"
  50 #include "cpu/inorder/inorder_dyn_inst.hh"
  51 #include "cpu/inorder/pipeline_traits.hh"
  52 #include "cpu/inorder/pipeline_stage.hh"
  53 #include "cpu/inorder/thread_state.hh"
  54 #include "cpu/inorder/reg_dep_map.hh"
  55 #include "cpu/o3/dep_graph.hh"
  56 #include "cpu/o3/rename_map.hh"
  57 #include "mem/packet.hh"
  58 #include "mem/port.hh"
  59 #include "mem/request.hh"
  60 #include "sim/eventq.hh"
  61 #include "sim/process.hh"
  62
  63 class ThreadContext;
  64 class MemInterface;
  65 class MemObject;
  66 class Process;
  67 class ResourcePool;
  68
  69 class InOrderCPU : public BaseCPU
  70 {
  71
  72   protected:
  73     typedef ThePipeline::Params Params;
  74     typedef InOrderThreadState Thread;
  75
  76    //ISA TypeDefs
  77     typedef TheISA::IntReg IntReg;
  78     typedef TheISA::FloatReg FloatReg;
  79     typedef TheISA::FloatRegBits FloatRegBits;
  80     typedef TheISA::RegFile RegFile;
  81     typedef TheISA::MiscReg MiscReg;
  82
  83     //DynInstPtr TypeDefs
  84     typedef ThePipeline::DynInstPtr DynInstPtr;
  85     typedef std::list<DynInstPtr>::iterator ListIt;
  86
  87     //TimeBuffer TypeDefs
  88     typedef TimeBuffer<InterStageStruct> StageQueue;
  89
  90     friend class Resource;
  91
  92   public:
  93     /** Constructs a CPU with the given parameters. */
  94     InOrderCPU(Params *params);
  95
  96     /** CPU ID */
  97     int cpu_id;
  98
  99     /** Type of core that this is */
 100     std::string coreType;
 101
 102     int readCpuId() { return cpu_id; }
 103
 104     void setCpuId(int val) { cpu_id = val; }
 105
 106     Params *cpu_params;
 107
 108   public:
 109     enum Status {
 110         Running,
 111         Idle,
 112         Halted,
 113         Blocked,
 114         SwitchedOut
 115     };
 116
 117     /** Overall CPU status. */
 118     Status _status;
 119
 120   private:
 121     /** Define TickEvent for the CPU */
 122     class TickEvent : public Event
 123     {
 124       private:
 125         /** Pointer to the CPU. */
 126         InOrderCPU *cpu;
 127
 128       public:
 129         /** Constructs a tick event. */
 130         TickEvent(InOrderCPU *c);
 131
 132         /** Processes a tick event, calling tick() on the CPU. */
 133         void process();
 134
 135         /** Returns the description of the tick event. */
 136         const char *description();
 137     };
 138
 139     /** The tick event used for scheduling CPU ticks. */
 140     TickEvent tickEvent;
 141
 142     /** Schedule tick event, regardless of its current state. */
 143     void scheduleTickEvent(int delay)
 144     {
 145         if (tickEvent.squashed())
 146           mainEventQueue.reschedule(&tickEvent, nextCycle(curTick + ticks(delay)));
 147         else if (!tickEvent.scheduled())
 148           mainEventQueue.schedule(&tickEvent, nextCycle(curTick + ticks(delay)));
 149     }
 150
 151     /** Unschedule tick event, regardless of its current state. */
 152     void unscheduleTickEvent()
 153     {
 154         if (tickEvent.scheduled())
 155             tickEvent.squash();
 156     }
 157
 158   public:
 159     // List of Events That can be scheduled from
 160     // within the CPU.
 161     // NOTE(1): The Resource Pool also uses this event list
 162     // to schedule events broadcast to all resources interfaces
 163     // NOTE(2): CPU Events usually need to schedule a corresponding resource
 164     // pool event.
 165     enum CPUEventType {
 166         ActivateThread,
 167         DeallocateThread,
 168         SuspendThread,
 169         DisableThreads,
 170         EnableThreads,
 171         DisableVPEs,
 172         EnableVPEs,
 173         Trap,
 174         InstGraduated,
 175         SquashAll,
 176         UpdatePCs,
 177         NumCPUEvents
 178     };
 179
 180     static std::string eventNames[NumCPUEvents];
 181
 182     /** Define CPU Event */
 183     class CPUEvent : public Event
 184     {
 185       protected:
 186         InOrderCPU *cpu;
 187
 188       public:
 189         CPUEventType cpuEventType;
 190         ThreadID tid;
 191         unsigned vpe;
 192         Fault fault;
 193
 194       public:
 195         /** Constructs a CPU event. */
 196         CPUEvent(InOrderCPU *_cpu, CPUEventType e_type, Fault fault,
 197                  ThreadID _tid, unsigned _vpe);
 198
 199         /** Set Type of Event To Be Scheduled */
 200         void setEvent(CPUEventType e_type, Fault _fault, ThreadID _tid,
 201                       unsigned _vpe)
 202         {
 203             fault = _fault;
 204             cpuEventType = e_type;
 205             tid = _tid;
 206             vpe = _vpe;
 207         }
 208
 209         /** Processes a resource event. */
 210         virtual void process();
 211
 212         /** Returns the description of the resource event. */
 213         const char *description();
 214
 215         /** Schedule Event */
 216         void scheduleEvent(int delay);
 217
 218         /** Unschedule This Event */
 219         void unscheduleEvent();
 220     };
 221
 222     /** Schedule a CPU Event */
 223     void scheduleCpuEvent(CPUEventType cpu_event, Fault fault, ThreadID tid,
 224                           unsigned vpe, unsigned delay = 0);
 225
 226   public:
 227     /** Interface between the CPU and CPU resources. */
 228     ResourcePool *resPool;
 229
 230     /** Instruction used to signify that there is no *real* instruction in buffer slot */
 231     DynInstPtr dummyBufferInst;
 232
 233     /** Used by resources to signify a denied access to a resource. */
 234     ResourceRequest *dummyReq;
 235
 236     /** Identifies the resource id that identifies a fetch
 237      * access unit.
 238      */
 239     unsigned fetchPortIdx;
 240
 241     /** Identifies the resource id that identifies a ITB       */
 242     unsigned itbIdx;
 243
 244     /** Identifies the resource id that identifies a data
 245      * access unit.
 246      */
 247     unsigned dataPortIdx;
 248
 249     /** Identifies the resource id that identifies a DTB       */
 250     unsigned dtbIdx;
 251
 252     /** The Pipeline Stages for the CPU */
 253     PipelineStage *pipelineStage[ThePipeline::NumStages];
 254
 255     /** Program Counters */
 256     TheISA::IntReg PC[ThePipeline::MaxThreads];
 257     TheISA::IntReg nextPC[ThePipeline::MaxThreads];
 258     TheISA::IntReg nextNPC[ThePipeline::MaxThreads];
 259
 260     /** The Register File for the CPU */
 261     TheISA::IntRegFile intRegFile[ThePipeline::MaxThreads];;
 262     union {
 263         FloatReg f[ThePipeline::MaxThreads][TheISA::NumFloatRegs];
 264         FloatRegBits i[ThePipeline::MaxThreads][TheISA::NumFloatRegs];
 265     } floatRegs;
 266
 267     /** ISA state */
 268     TheISA::ISA isa[ThePipeline::MaxThreads];
 269
 270     /** Dependency Tracker for Integer & Floating Point Regs */
 271     RegDepMap archRegDepMap[ThePipeline::MaxThreads];
 272
 273     /** Global communication structure */
 274     TimeBuffer<TimeStruct> timeBuffer;
 275
 276     /** Communication structure that sits in between pipeline stages */
 277     StageQueue *stageQueue[ThePipeline::NumStages-1];
 278
 279     TheISA::TLB *getITBPtr();
 280     TheISA::TLB *getDTBPtr();
 281
 282   public:
 283
 284     /** Registers statistics. */
 285     void regStats();
 286
 287     /** Ticks CPU, calling tick() on each stage, and checking the overall
 288      *  activity to see if the CPU should deschedule itself.
 289      */
 290     void tick();
 291
 292     /** Initialize the CPU */
 293     void init();
 294
 295     /** Reset State in the CPU */
 296     void reset();
 297
 298     /** Get a Memory Port */
 299     Port* getPort(const std::string &if_name, int idx = 0);
 300
 301     /** trap() - sets up a trap event on the cpuTraps to handle given fault.
 302      *  trapCPU() - Traps to handle given fault
 303      */
 304     void trap(Fault fault, ThreadID tid, int delay = 0);
 305     void trapCPU(Fault fault, ThreadID tid);
 306
 307     /** Setup CPU to insert a thread's context */
 308     void insertThread(ThreadID tid);
 309
 310     /** Remove all of a thread's context from CPU */
 311     void removeThread(ThreadID tid);
 312
 313     /** Add Thread to Active Threads List. */
 314     void activateContext(ThreadID tid, int delay = 0);
 315     void activateThread(ThreadID tid);
 316
 317     /** Remove Thread from Active Threads List */
 318     void suspendContext(ThreadID tid, int delay = 0);
 319     void suspendThread(ThreadID tid);
 320
 321     /** Remove Thread from Active Threads List &&
 322      *  Remove Thread Context from CPU.
 323      */
 324     void deallocateContext(ThreadID tid, int delay = 0);
 325     void deallocateThread(ThreadID tid);
 326     void deactivateThread(ThreadID tid);
 327
 328     PipelineStage* getPipeStage(int stage_num);
 329
 330     int
 331     contextId()
 332     {
 333         hack_once("return a bogus context id");
 334         return 0;
 335     }
 336
 337     /** Remove Thread from Active Threads List &&
 338      *  Remove Thread Context from CPU.
 339      */
 340     void haltContext(ThreadID tid, int delay = 0);
 341
 342     void removePipelineStalls(ThreadID tid);
 343
 344     void squashThreadInPipeline(ThreadID tid);
 345
 346     /// Notify the CPU to enable a virtual processor element.
 347     virtual void enableVirtProcElement(unsigned vpe);
 348     void enableVPEs(unsigned vpe);
 349
 350     /// Notify the CPU to disable a virtual processor element.
 351     virtual void disableVirtProcElement(ThreadID tid, unsigned vpe);
 352     void disableVPEs(ThreadID tid, unsigned vpe);
 353
 354     /// Notify the CPU that multithreading is enabled.
 355     virtual void enableMultiThreading(unsigned vpe);
 356     void enableThreads(unsigned vpe);
 357
 358     /// Notify the CPU that multithreading is disabled.
 359     virtual void disableMultiThreading(ThreadID tid, unsigned vpe);
 360     void disableThreads(ThreadID tid, unsigned vpe);
 361
 362     /** Activate a Thread When CPU Resources are Available. */
 363     void activateWhenReady(ThreadID tid);
 364
 365     /** Add or Remove a Thread Context in the CPU. */
 366     void doContextSwitch();
 367
 368     /** Update The Order In Which We Process Threads. */
 369     void updateThreadPriority();
 370
 371     /** Switches a Pipeline Stage to Active. (Unused currently) */
 372     void switchToActive(int stage_idx)
 373     { /*pipelineStage[stage_idx]->switchToActive();*/ }
 374
 375     /** Get the current instruction sequence number, and increment it. */
 376     InstSeqNum getAndIncrementInstSeq(ThreadID tid)
 377     { return globalSeqNum[tid]++; }
 378
 379     /** Get the current instruction sequence number, and increment it. */
 380     InstSeqNum nextInstSeqNum(ThreadID tid)
 381     { return globalSeqNum[tid]; }
 382
 383     /** Increment Instruction Sequence Number */
 384     void incrInstSeqNum(ThreadID tid)
 385     { globalSeqNum[tid]++; }
 386
 387     /** Set Instruction Sequence Number */
 388     void setInstSeqNum(ThreadID tid, InstSeqNum seq_num)
 389     {
 390         globalSeqNum[tid] = seq_num;
 391     }
 392
 393     /** Get & Update Next Event Number */
 394     InstSeqNum getNextEventNum()
 395     {
 396         return cpuEventNum++;
 397     }
 398
 399     /** Get instruction asid. */
 400     int getInstAsid(ThreadID tid)
 401     { return thread[tid]->getInstAsid(); }
 402
 403     /** Get data asid. */
 404     int getDataAsid(ThreadID tid)
 405     { return thread[tid]->getDataAsid(); }
 406
 407     /** Register file accessors  */
 408     uint64_t readIntReg(int reg_idx, ThreadID tid);
 409
 410     FloatReg readFloatReg(int reg_idx, ThreadID tid);
 411
 412     FloatRegBits readFloatRegBits(int reg_idx, ThreadID tid);
 413
 414     void setIntReg(int reg_idx, uint64_t val, ThreadID tid);
 415
 416     void setFloatReg(int reg_idx, FloatReg val, ThreadID tid);
 417
 418     void setFloatRegBits(int reg_idx, FloatRegBits val,  ThreadID tid);
 419
 420     /** Reads a miscellaneous register. */
 421     MiscReg readMiscRegNoEffect(int misc_reg, ThreadID tid = 0);
 422
 423     /** Reads a misc. register, including any side effects the read
 424      * might have as defined by the architecture.
 425      */
 426     MiscReg readMiscReg(int misc_reg, ThreadID tid = 0);
 427
 428     /** Sets a miscellaneous register. */
 429     void setMiscRegNoEffect(int misc_reg, const MiscReg &val,
 430                             ThreadID tid = 0);
 431
 432     /** Sets a misc. register, including any side effects the write
 433      * might have as defined by the architecture.
 434      */
 435     void setMiscReg(int misc_reg, const MiscReg &val, ThreadID tid = 0);
 436
 437     /** Reads a int/fp/misc reg. from another thread depending on ISA-defined
 438      *  target thread
 439      */
 440     uint64_t readRegOtherThread(unsigned misc_reg,
 441                                 ThreadID tid = InvalidThreadID);
 442
 443     /** Sets a int/fp/misc reg. from another thread depending on an ISA-defined
 444      * target thread
 445      */
 446     void setRegOtherThread(unsigned misc_reg, const MiscReg &val,
 447                            ThreadID tid);
 448
 449     /** Reads the commit PC of a specific thread. */
 450     uint64_t readPC(ThreadID tid);
 451
 452     /** Sets the commit PC of a specific thread. */
 453     void setPC(Addr new_PC, ThreadID tid);
 454
 455     /** Reads the next PC of a specific thread. */
 456     uint64_t readNextPC(ThreadID tid);
 457
 458     /** Sets the next PC of a specific thread. */
 459     void setNextPC(uint64_t val, ThreadID tid);
 460
 461     /** Reads the next NPC of a specific thread. */
 462     uint64_t readNextNPC(ThreadID tid);
 463
 464     /** Sets the next NPC of a specific thread. */
 465     void setNextNPC(uint64_t val, ThreadID tid);
 466
 467     /** Function to add instruction onto the head of the list of the
 468      *  instructions.  Used when new instructions are fetched.
 469      */
 470     ListIt addInst(DynInstPtr &inst);
 471
 472     /** Function to tell the CPU that an instruction has completed. */
 473     void instDone(DynInstPtr inst, ThreadID tid);
 474
 475     /** Add Instructions to the CPU Remove List*/
 476     void addToRemoveList(DynInstPtr &inst);
 477
 478     /** Remove an instruction from CPU */
 479     void removeInst(DynInstPtr &inst);
 480
 481     /** Remove all instructions younger than the given sequence number. */
 482     void removeInstsUntil(const InstSeqNum &seq_num,ThreadID tid);
 483
 484     /** Removes the instruction pointed to by the iterator. */
 485     inline void squashInstIt(const ListIt &instIt, ThreadID tid);
 486
 487     /** Cleans up all instructions on the instruction remove list. */
 488     void cleanUpRemovedInsts();
 489
 490     /** Cleans up all instructions on the request remove list. */
 491     void cleanUpRemovedReqs();
 492
 493     /** Cleans up all instructions on the CPU event remove list. */
 494     void cleanUpRemovedEvents();
 495
 496     /** Debug function to print all instructions on the list. */
 497     void dumpInsts();
 498
 499     /** Forwards an instruction read to the appropriate data
 500      *  resource (indexes into Resource Pool thru "dataPortIdx")
 501      */
 502     template <class T>
 503     Fault read(DynInstPtr inst, Addr addr, T &data, unsigned flags);
 504
 505     /** Forwards an instruction write. to the appropriate data
 506      *  resource (indexes into Resource Pool thru "dataPortIdx")
 507      */
 508     template <class T>
 509     Fault write(DynInstPtr inst, T data, Addr addr, unsigned flags,
 510                 uint64_t *write_res = NULL);
 511
 512     /** Forwards an instruction prefetch to the appropriate data
 513      *  resource (indexes into Resource Pool thru "dataPortIdx")
 514      */
 515     void prefetch(DynInstPtr inst);
 516
 517     /** Forwards an instruction writeHint to the appropriate data
 518      *  resource (indexes into Resource Pool thru "dataPortIdx")
 519      */
 520     void writeHint(DynInstPtr inst);
 521
 522     /** Executes a syscall.*/
 523     void syscall(int64_t callnum, ThreadID tid);
 524
 525   public:
 526     /** Per-Thread List of all the instructions in flight. */
 527     std::list<DynInstPtr> instList[ThePipeline::MaxThreads];
 528
 529     /** List of all the instructions that will be removed at the end of this
 530      *  cycle.
 531      */
 532     std::queue<ListIt> removeList;
 533
 534     /** List of all the resource requests that will be removed at the end of this
 535      *  cycle.
 536      */
 537     std::queue<ResourceRequest*> reqRemoveList;
 538
 539     /** List of all the cpu event requests that will be removed at the end of
 540      *  the current cycle.
 541      */
 542     std::queue<Event*> cpuEventRemoveList;
 543
 544     /** Records if instructions need to be removed this cycle due to
 545      *  being retired or squashed.
 546      */
 547     bool removeInstsThisCycle;
 548
 549     /** True if there is non-speculative Inst Active In Pipeline. Lets any
 550      * execution unit know, NOT to execute while the instruction is active.
 551      */
 552     bool nonSpecInstActive[ThePipeline::MaxThreads];
 553
 554     /** Instruction Seq. Num of current non-speculative instruction. */
 555     InstSeqNum nonSpecSeqNum[ThePipeline::MaxThreads];
 556
 557     /** Instruction Seq. Num of last instruction squashed in pipeline */
 558     InstSeqNum squashSeqNum[ThePipeline::MaxThreads];
 559
 560     /** Last Cycle that the CPU squashed instruction end. */
 561     Tick lastSquashCycle[ThePipeline::MaxThreads];
 562
 563     std::list<ThreadID> fetchPriorityList;
 564
 565   protected:
 566     /** Active Threads List */
 567     std::list<ThreadID> activeThreads;
 568
 569     /** Current Threads List */
 570     std::list<ThreadID> currentThreads;
 571
 572     /** Suspended Threads List */
 573     std::list<ThreadID> suspendedThreads;
 574
 575     /** Thread Status Functions (Unused Currently) */
 576     bool isThreadInCPU(ThreadID tid);
 577     bool isThreadActive(ThreadID tid);
 578     bool isThreadSuspended(ThreadID tid);
 579     void addToCurrentThreads(ThreadID tid);
 580     void removeFromCurrentThreads(ThreadID tid);
 581
 582   private:
 583     /** The activity recorder; used to tell if the CPU has any
 584      * activity remaining or if it can go to idle and deschedule
 585      * itself.
 586      */
 587     ActivityRecorder activityRec;
 588
 589   public:
 590     void readFunctional(Addr addr, uint32_t &buffer);
 591
 592     /** Number of Active Threads in the CPU */
 593     ThreadID numActiveThreads() { return activeThreads.size(); }
 594
 595     /** Records that there was time buffer activity this cycle. */
 596     void activityThisCycle() { activityRec.activity(); }
 597
 598     /** Changes a stage's status to active within the activity recorder. */
 599     void activateStage(const int idx)
 600     { activityRec.activateStage(idx); }
 601
 602     /** Changes a stage's status to inactive within the activity recorder. */
 603     void deactivateStage(const int idx)
 604     { activityRec.deactivateStage(idx); }
 605
 606     /** Wakes the CPU, rescheduling the CPU if it's not already active. */
 607     void wakeCPU();
 608
 609     /** Gets a free thread id. Use if thread ids change across system. */
 610     ThreadID getFreeTid();
 611
 612     // LL/SC debug functionality
 613     unsigned stCondFails;
 614     unsigned readStCondFailures() { return stCondFails; }
 615     unsigned setStCondFailures(unsigned st_fails) { return stCondFails = st_fails; }
 616
 617     /** Returns a pointer to a thread context. */
 618     ThreadContext *tcBase(ThreadID tid = 0)
 619     {
 620         return thread[tid]->getTC();
 621     }
 622
 623     /** Count the Total Instructions Committed in the CPU. */
 624     virtual Counter totalInstructions() const
 625     {
 626         Counter total(0);
 627
 628         for (ThreadID tid = 0; tid < (ThreadID)thread.size(); tid++)
 629             total += thread[tid]->numInst;
 630
 631         return total;
 632     }
 633
 634     /** The global sequence number counter. */
 635     InstSeqNum globalSeqNum[ThePipeline::MaxThreads];
 636
 637     /** The global event number counter. */
 638     InstSeqNum cpuEventNum;
 639
 640     /** Counter of how many stages have completed switching out. */
 641     int switchCount;
 642
 643     /** Pointers to all of the threads in the CPU. */
 644     std::vector<Thread *> thread;
 645
 646     /** Pointer to the icache interface. */
 647     MemInterface *icacheInterface;
 648
 649     /** Pointer to the dcache interface. */
 650     MemInterface *dcacheInterface;
 651
 652     /** Whether or not the CPU should defer its registration. */
 653     bool deferRegistration;
 654
 655     /** Per-Stage Instruction Tracing */
 656     bool stageTracing;
 657
 658     /** Is there a context switch pending? */
 659     bool contextSwitch;
 660
 661     /** Threads Scheduled to Enter CPU */
 662     std::list<int> cpuWaitList;
 663
 664     /** The cycle that the CPU was last running, used for statistics. */
 665     Tick lastRunningCycle;
 666
 667     /** Number of Virtual Processors the CPU can process */
 668     unsigned numVirtProcs;
 669
 670     /** Update Thread , used for statistic purposes*/
 671     inline void tickThreadStats();
 672
 673     /** Per-Thread Tick */
 674     Stats::Vector threadCycles;
 675
 676     /** Tick for SMT */
 677     Stats::Scalar smtCycles;
 678
 679     /** Stat for total number of times the CPU is descheduled. */
 680     Stats::Scalar timesIdled;
 681
 682     /** Stat for total number of cycles the CPU spends descheduled. */
 683     Stats::Scalar idleCycles;
 684
 685     /** Stat for the number of committed instructions per thread. */
 686     Stats::Vector committedInsts;
 687
 688     /** Stat for the number of committed instructions per thread. */
 689     Stats::Vector smtCommittedInsts;
 690
 691     /** Stat for the total number of committed instructions. */
 692     Stats::Scalar totalCommittedInsts;
 693
 694     /** Stat for the CPI per thread. */
 695     Stats::Formula cpi;
 696
 697     /** Stat for the SMT-CPI per thread. */
 698     Stats::Formula smtCpi;
 699
 700     /** Stat for the total CPI. */
 701     Stats::Formula totalCpi;
 702
 703     /** Stat for the IPC per thread. */
 704     Stats::Formula ipc;
 705
 706     /** Stat for the total IPC. */
 707     Stats::Formula smtIpc;
 708
 709     /** Stat for the total IPC. */
 710     Stats::Formula totalIpc;
 711 };
 712
 713 #endif // __CPU_O3_CPU_HH__