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 "arch/registers.hh"
  44 #include "base/statistics.hh"
  45 #include "base/timebuf.hh"
  46 #include "base/types.hh"
  47 #include "config/full_system.hh"
  48 #include "config/the_isa.hh"
  49 #include "cpu/activity.hh"
  50 #include "cpu/base.hh"
  51 #include "cpu/simple_thread.hh"
  52 #include "cpu/inorder/inorder_dyn_inst.hh"
  53 #include "cpu/inorder/pipeline_traits.hh"
  54 #include "cpu/inorder/pipeline_stage.hh"
  55 #include "cpu/inorder/thread_state.hh"
  56 #include "cpu/inorder/reg_dep_map.hh"
  57 #include "cpu/o3/dep_graph.hh"
  58 #include "cpu/o3/rename_map.hh"
  59 #include "mem/packet.hh"
  60 #include "mem/port.hh"
  61 #include "mem/request.hh"
  62 #include "sim/eventq.hh"
  63 #include "sim/process.hh"
  64
  65 class ThreadContext;
  66 class MemInterface;
  67 class MemObject;
  68 class Process;
  69 class ResourcePool;
  70
  71 class InOrderCPU : public BaseCPU
  72 {
  73
  74   protected:
  75     typedef ThePipeline::Params Params;
  76     typedef InOrderThreadState Thread;
  77
  78    //ISA TypeDefs
  79     typedef TheISA::IntReg IntReg;
  80     typedef TheISA::FloatReg FloatReg;
  81     typedef TheISA::FloatRegBits FloatRegBits;
  82     typedef TheISA::MiscReg MiscReg;
  83
  84     //DynInstPtr TypeDefs
  85     typedef ThePipeline::DynInstPtr DynInstPtr;
  86     typedef std::list<DynInstPtr>::iterator ListIt;
  87
  88     //TimeBuffer TypeDefs
  89     typedef TimeBuffer<InterStageStruct> StageQueue;
  90
  91     friend class Resource;
  92
  93   public:
  94     /** Constructs a CPU with the given parameters. */
  95     InOrderCPU(Params *params);
  96
  97     /** CPU ID */
  98     int cpu_id;
  99
 100     /** Type of core that this is */
 101     std::string coreType;
 102
 103     // Only need for SE MODE
 104     enum ThreadModel {
 105         Single,
 106         SMT,
 107         SwitchOnCacheMiss
 108     };
 109
 110     ThreadModel threadModel;
 111
 112     int readCpuId() { return cpu_id; }
 113
 114     void setCpuId(int val) { cpu_id = val; }
 115
 116     Params *cpu_params;
 117
 118   public:
 119     enum Status {
 120         Running,
 121         Idle,
 122         Halted,
 123         Blocked,
 124         SwitchedOut
 125     };
 126
 127     /** Overall CPU status. */
 128     Status _status;
 129   private:
 130     /** Define TickEvent for the CPU */
 131     class TickEvent : public Event
 132     {
 133       private:
 134         /** Pointer to the CPU. */
 135         InOrderCPU *cpu;
 136
 137       public:
 138         /** Constructs a tick event. */
 139         TickEvent(InOrderCPU *c);
 140
 141         /** Processes a tick event, calling tick() on the CPU. */
 142         void process();
 143
 144         /** Returns the description of the tick event. */
 145         const char *description();
 146     };
 147
 148     /** The tick event used for scheduling CPU ticks. */
 149     TickEvent tickEvent;
 150
 151     /** Schedule tick event, regardless of its current state. */
 152     void scheduleTickEvent(int delay)
 153     {
 154         if (tickEvent.squashed())
 155           mainEventQueue.reschedule(&tickEvent,
 156                                     nextCycle(curTick + ticks(delay)));
 157         else if (!tickEvent.scheduled())
 158           mainEventQueue.schedule(&tickEvent,
 159                                   nextCycle(curTick + ticks(delay)));
 160     }
 161
 162     /** Unschedule tick event, regardless of its current state. */
 163     void unscheduleTickEvent()
 164     {
 165         if (tickEvent.scheduled())
 166             tickEvent.squash();
 167     }
 168
 169   public:
 170     // List of Events That can be scheduled from
 171     // within the CPU.
 172     // NOTE(1): The Resource Pool also uses this event list
 173     // to schedule events broadcast to all resources interfaces
 174     // NOTE(2): CPU Events usually need to schedule a corresponding resource
 175     // pool event.
 176     enum CPUEventType {
 177         ActivateThread,
 178         ActivateNextReadyThread,
 179         DeactivateThread,
 180         DeallocateThread,
 181         SuspendThread,
 182         Trap,
 183         InstGraduated,
 184         SquashFromMemStall,
 185         UpdatePCs,
 186         NumCPUEvents
 187     };
 188
 189     static std::string eventNames[NumCPUEvents];
 190
 191     /** Define CPU Event */
 192     class CPUEvent : public Event
 193     {
 194       protected:
 195         InOrderCPU *cpu;
 196
 197       public:
 198         CPUEventType cpuEventType;
 199         ThreadID tid;
 200         DynInstPtr inst;
 201         Fault fault;
 202         unsigned vpe;
 203
 204       public:
 205         /** Constructs a CPU event. */
 206         CPUEvent(InOrderCPU *_cpu, CPUEventType e_type, Fault fault,
 207                  ThreadID _tid, DynInstPtr inst, unsigned event_pri_offset);
 208
 209         /** Set Type of Event To Be Scheduled */
 210         void setEvent(CPUEventType e_type, Fault _fault, ThreadID _tid,
 211                       DynInstPtr _inst)
 212         {
 213             fault = _fault;
 214             cpuEventType = e_type;
 215             tid = _tid;
 216             inst = _inst;
 217             vpe = 0;
 218         }
 219
 220         /** Processes a resource event. */
 221         virtual void process();
 222
 223         /** Returns the description of the resource event. */
 224         const char *description();
 225
 226         /** Schedule Event */
 227         void scheduleEvent(int delay);
 228
 229         /** Unschedule This Event */
 230         void unscheduleEvent();
 231     };
 232
 233     /** Schedule a CPU Event */
 234     void scheduleCpuEvent(CPUEventType cpu_event, Fault fault, ThreadID tid,
 235                           DynInstPtr inst, unsigned delay = 0,
 236                           unsigned event_pri_offset = 0);
 237
 238   public:
 239     /** Interface between the CPU and CPU resources. */
 240     ResourcePool *resPool;
 241
 242     /** Instruction used to signify that there is no *real* instruction in
 243         buffer slot */
 244     DynInstPtr dummyInst;
 245
 246     /** Used by resources to signify a denied access to a resource. */
 247     ResourceRequest *dummyReq;
 248
 249     /** Identifies the resource id that identifies a fetch
 250      * access unit.
 251      */
 252     unsigned fetchPortIdx;
 253
 254     /** Identifies the resource id that identifies a ITB       */
 255     unsigned itbIdx;
 256
 257     /** Identifies the resource id that identifies a data
 258      * access unit.
 259      */
 260     unsigned dataPortIdx;
 261
 262     /** Identifies the resource id that identifies a DTB       */
 263     unsigned dtbIdx;
 264
 265     /** The Pipeline Stages for the CPU */
 266     PipelineStage *pipelineStage[ThePipeline::NumStages];
 267
 268     /** Program Counters */
 269     TheISA::IntReg PC[ThePipeline::MaxThreads];
 270     TheISA::IntReg nextPC[ThePipeline::MaxThreads];
 271     TheISA::IntReg nextNPC[ThePipeline::MaxThreads];
 272
 273     /** The Register File for the CPU */
 274     union {
 275         FloatReg f[ThePipeline::MaxThreads][TheISA::NumFloatRegs];
 276         FloatRegBits i[ThePipeline::MaxThreads][TheISA::NumFloatRegs];
 277     } floatRegs;
 278     TheISA::IntReg intRegs[ThePipeline::MaxThreads][TheISA::NumIntRegs];
 279
 280     /** ISA state */
 281     TheISA::ISA isa[ThePipeline::MaxThreads];
 282
 283     /** Dependency Tracker for Integer & Floating Point Regs */
 284     RegDepMap archRegDepMap[ThePipeline::MaxThreads];
 285
 286     /** Global communication structure */
 287     TimeBuffer<TimeStruct> timeBuffer;
 288
 289     /** Communication structure that sits in between pipeline stages */
 290     StageQueue *stageQueue[ThePipeline::NumStages-1];
 291
 292     TheISA::TLB *getITBPtr();
 293     TheISA::TLB *getDTBPtr();
 294
 295   public:
 296
 297     /** Registers statistics. */
 298     void regStats();
 299
 300     /** Ticks CPU, calling tick() on each stage, and checking the overall
 301      *  activity to see if the CPU should deschedule itself.
 302      */
 303     void tick();
 304
 305     /** Initialize the CPU */
 306     void init();
 307
 308     /** Reset State in the CPU */
 309     void reset();
 310
 311     /** Get a Memory Port */
 312     Port* getPort(const std::string &if_name, int idx = 0);
 313
 314 #if FULL_SYSTEM
 315     /** HW return from error interrupt. */
 316     Fault hwrei(ThreadID tid);
 317
 318     bool simPalCheck(int palFunc, ThreadID tid);
 319
 320     /** Returns the Fault for any valid interrupt. */
 321     Fault getInterrupts();
 322
 323     /** Processes any an interrupt fault. */
 324     void processInterrupts(Fault interrupt);
 325
 326     /** Halts the CPU. */
 327     void halt() { panic("Halt not implemented!\n"); }
 328
 329     /** Update the Virt and Phys ports of all ThreadContexts to
 330      * reflect change in memory connections. */
 331     void updateMemPorts();
 332
 333     /** Check if this address is a valid instruction address. */
 334     bool validInstAddr(Addr addr) { return true; }
 335
 336     /** Check if this address is a valid data address. */
 337     bool validDataAddr(Addr addr) { return true; }
 338 #endif
 339
 340     /** trap() - sets up a trap event on the cpuTraps to handle given fault.
 341      *  trapCPU() - Traps to handle given fault
 342      */
 343     void trap(Fault fault, ThreadID tid, int delay = 0);
 344     void trapCPU(Fault fault, ThreadID tid);
 345
 346     /** Add Thread to Active Threads List. */
 347     void activateContext(ThreadID tid, int delay = 0);
 348     void activateThread(ThreadID tid);
 349
 350     /** Add Thread to Active Threads List. */
 351     void activateNextReadyContext(int delay = 0);
 352     void activateNextReadyThread();
 353
 354     /** Remove from Active Thread List */
 355     void deactivateContext(ThreadID tid, int delay = 0);
 356     void deactivateThread(ThreadID tid);
 357
 358     /** Suspend Thread, Remove from Active Threads List, Add to Suspend List */
 359     void haltContext(ThreadID tid, int delay = 0);
 360     void suspendContext(ThreadID tid, int delay = 0);
 361     void suspendThread(ThreadID tid);
 362
 363     /** Remove Thread from Active Threads List, Remove Any Loaded Thread State */
 364     void deallocateContext(ThreadID tid, int delay = 0);
 365     void deallocateThread(ThreadID tid);
 366
 367     /** squashFromMemStall() - sets up a squash event
 368      *  squashDueToMemStall() - squashes pipeline
 369      */
 370     void squashFromMemStall(DynInstPtr inst, ThreadID tid, int delay = 0);
 371     void squashDueToMemStall(int stage_num, InstSeqNum seq_num, ThreadID tid);
 372
 373     void removePipelineStalls(ThreadID tid);
 374     void squashThreadInPipeline(ThreadID tid);
 375     void squashBehindMemStall(int stage_num, InstSeqNum seq_num, ThreadID tid);
 376
 377     PipelineStage* getPipeStage(int stage_num);
 378
 379     int
 380     contextId()
 381     {
 382         hack_once("return a bogus context id");
 383         return 0;
 384     }
 385
 386     /** Update The Order In Which We Process Threads. */
 387     void updateThreadPriority();
 388
 389     /** Switches a Pipeline Stage to Active. (Unused currently) */
 390     void switchToActive(int stage_idx)
 391     { /*pipelineStage[stage_idx]->switchToActive();*/ }
 392
 393     /** Get the current instruction sequence number, and increment it. */
 394     InstSeqNum getAndIncrementInstSeq(ThreadID tid)
 395     { return globalSeqNum[tid]++; }
 396
 397     /** Get the current instruction sequence number, and increment it. */
 398     InstSeqNum nextInstSeqNum(ThreadID tid)
 399     { return globalSeqNum[tid]; }
 400
 401     /** Increment Instruction Sequence Number */
 402     void incrInstSeqNum(ThreadID tid)
 403     { globalSeqNum[tid]++; }
 404
 405     /** Set Instruction Sequence Number */
 406     void setInstSeqNum(ThreadID tid, InstSeqNum seq_num)
 407     {
 408         globalSeqNum[tid] = seq_num;
 409     }
 410
 411     /** Get & Update Next Event Number */
 412     InstSeqNum getNextEventNum()
 413     {
 414 #ifdef DEBUG
 415         return cpuEventNum++;
 416 #else
 417         return 0;
 418 #endif
 419     }
 420
 421     /** Register file accessors  */
 422     uint64_t readIntReg(int reg_idx, ThreadID tid);
 423
 424     FloatReg readFloatReg(int reg_idx, ThreadID tid);
 425
 426     FloatRegBits readFloatRegBits(int reg_idx, ThreadID tid);
 427
 428     void setIntReg(int reg_idx, uint64_t val, ThreadID tid);
 429
 430     void setFloatReg(int reg_idx, FloatReg val, ThreadID tid);
 431
 432     void setFloatRegBits(int reg_idx, FloatRegBits val,  ThreadID tid);
 433
 434     /** Reads a miscellaneous register. */
 435     MiscReg readMiscRegNoEffect(int misc_reg, ThreadID tid = 0);
 436
 437     /** Reads a misc. register, including any side effects the read
 438      * might have as defined by the architecture.
 439      */
 440     MiscReg readMiscReg(int misc_reg, ThreadID tid = 0);
 441
 442     /** Sets a miscellaneous register. */
 443     void setMiscRegNoEffect(int misc_reg, const MiscReg &val,
 444                             ThreadID tid = 0);
 445
 446     /** Sets a misc. register, including any side effects the write
 447      * might have as defined by the architecture.
 448      */
 449     void setMiscReg(int misc_reg, const MiscReg &val, ThreadID tid = 0);
 450
 451     /** Reads a int/fp/misc reg. from another thread depending on ISA-defined
 452      *  target thread
 453      */
 454     uint64_t readRegOtherThread(unsigned misc_reg,
 455                                 ThreadID tid = InvalidThreadID);
 456
 457     /** Sets a int/fp/misc reg. from another thread depending on an ISA-defined
 458      * target thread
 459      */
 460     void setRegOtherThread(unsigned misc_reg, const MiscReg &val,
 461                            ThreadID tid);
 462
 463     /** Reads the commit PC of a specific thread. */
 464     uint64_t readPC(ThreadID tid);
 465
 466     /** Sets the commit PC of a specific thread. */
 467     void setPC(Addr new_PC, ThreadID tid);
 468
 469     /** Reads the next PC of a specific thread. */
 470     uint64_t readNextPC(ThreadID tid);
 471
 472     /** Sets the next PC of a specific thread. */
 473     void setNextPC(uint64_t val, ThreadID tid);
 474
 475     /** Reads the next NPC of a specific thread. */
 476     uint64_t readNextNPC(ThreadID tid);
 477
 478     /** Sets the next NPC of a specific thread. */
 479     void setNextNPC(uint64_t val, ThreadID tid);
 480
 481     /** Function to add instruction onto the head of the list of the
 482      *  instructions.  Used when new instructions are fetched.
 483      */
 484     ListIt addInst(DynInstPtr &inst);
 485
 486     /** Function to tell the CPU that an instruction has completed. */
 487     void instDone(DynInstPtr inst, ThreadID tid);
 488
 489     /** Add Instructions to the CPU Remove List*/
 490     void addToRemoveList(DynInstPtr &inst);
 491
 492     /** Remove an instruction from CPU */
 493     void removeInst(DynInstPtr &inst);
 494
 495     /** Remove all instructions younger than the given sequence number. */
 496     void removeInstsUntil(const InstSeqNum &seq_num,ThreadID tid);
 497
 498     /** Removes the instruction pointed to by the iterator. */
 499     inline void squashInstIt(const ListIt &instIt, ThreadID tid);
 500
 501     /** Cleans up all instructions on the instruction remove list. */
 502     void cleanUpRemovedInsts();
 503
 504     /** Cleans up all instructions on the request remove list. */
 505     void cleanUpRemovedReqs();
 506
 507     /** Cleans up all instructions on the CPU event remove list. */
 508     void cleanUpRemovedEvents();
 509
 510     /** Debug function to print all instructions on the list. */
 511     void dumpInsts();
 512
 513     /** Forwards an instruction read to the appropriate data
 514      *  resource (indexes into Resource Pool thru "dataPortIdx")
 515      */
 516     template <class T>
 517     Fault read(DynInstPtr inst, Addr addr, T &data, unsigned flags);
 518
 519     /** Forwards an instruction write. to the appropriate data
 520      *  resource (indexes into Resource Pool thru "dataPortIdx")
 521      */
 522     template <class T>
 523     Fault write(DynInstPtr inst, T data, Addr addr, unsigned flags,
 524                 uint64_t *write_res = NULL);
 525
 526     /** Forwards an instruction prefetch to the appropriate data
 527      *  resource (indexes into Resource Pool thru "dataPortIdx")
 528      */
 529     void prefetch(DynInstPtr inst);
 530
 531     /** Forwards an instruction writeHint to the appropriate data
 532      *  resource (indexes into Resource Pool thru "dataPortIdx")
 533      */
 534     void writeHint(DynInstPtr inst);
 535
 536     /** Executes a syscall.*/
 537     void syscall(int64_t callnum, ThreadID tid);
 538
 539   public:
 540     /** Per-Thread List of all the instructions in flight. */
 541     std::list<DynInstPtr> instList[ThePipeline::MaxThreads];
 542
 543     /** List of all the instructions that will be removed at the end of this
 544      *  cycle.
 545      */
 546     std::queue<ListIt> removeList;
 547
 548     /** List of all the resource requests that will be removed at the end
 549      *  of this cycle.
 550      */
 551     std::queue<ResourceRequest*> reqRemoveList;
 552
 553     /** List of all the cpu event requests that will be removed at the end of
 554      *  the current cycle.
 555      */
 556     std::queue<Event*> cpuEventRemoveList;
 557
 558     /** Records if instructions need to be removed this cycle due to
 559      *  being retired or squashed.
 560      */
 561     bool removeInstsThisCycle;
 562
 563     /** True if there is non-speculative Inst Active In Pipeline. Lets any
 564      * execution unit know, NOT to execute while the instruction is active.
 565      */
 566     bool nonSpecInstActive[ThePipeline::MaxThreads];
 567
 568     /** Instruction Seq. Num of current non-speculative instruction. */
 569     InstSeqNum nonSpecSeqNum[ThePipeline::MaxThreads];
 570
 571     /** Instruction Seq. Num of last instruction squashed in pipeline */
 572     InstSeqNum squashSeqNum[ThePipeline::MaxThreads];
 573
 574     /** Last Cycle that the CPU squashed instruction end. */
 575     Tick lastSquashCycle[ThePipeline::MaxThreads];
 576
 577     std::list<ThreadID> fetchPriorityList;
 578
 579   protected:
 580     /** Active Threads List */
 581     std::list<ThreadID> activeThreads;
 582
 583     /** Ready Threads List */
 584     std::list<ThreadID> readyThreads;
 585
 586     /** Suspended Threads List */
 587     std::list<ThreadID> suspendedThreads;
 588
 589     /** Thread Status Functions */
 590     bool isThreadActive(ThreadID tid);
 591     bool isThreadReady(ThreadID tid);
 592     bool isThreadSuspended(ThreadID tid);
 593
 594   private:
 595     /** The activity recorder; used to tell if the CPU has any
 596      * activity remaining or if it can go to idle and deschedule
 597      * itself.
 598      */
 599     ActivityRecorder activityRec;
 600
 601   public:
 602     /** Number of Active Threads in the CPU */
 603     ThreadID numActiveThreads() { return activeThreads.size(); }
 604
 605     /** Thread id of active thread
 606      *  Only used for SwitchOnCacheMiss model.
 607      *  Assumes only 1 thread active
 608      */
 609     ThreadID activeThreadId()
 610     {
 611         if (numActiveThreads() > 0)
 612             return activeThreads.front();
 613         else
 614             return InvalidThreadID;
 615     }
 616
 617
 618     /** Records that there was time buffer activity this cycle. */
 619     void activityThisCycle() { activityRec.activity(); }
 620
 621     /** Changes a stage's status to active within the activity recorder. */
 622     void activateStage(const int idx)
 623     { activityRec.activateStage(idx); }
 624
 625     /** Changes a stage's status to inactive within the activity recorder. */
 626     void deactivateStage(const int idx)
 627     { activityRec.deactivateStage(idx); }
 628
 629     /** Wakes the CPU, rescheduling the CPU if it's not already active. */
 630     void wakeCPU();
 631
 632 #if FULL_SYSTEM
 633     virtual void wakeup();
 634 #endif
 635
 636     // LL/SC debug functionality
 637     unsigned stCondFails;
 638
 639     unsigned readStCondFailures()
 640     { return stCondFails; }
 641
 642     unsigned setStCondFailures(unsigned st_fails)
 643     { return stCondFails = st_fails; }
 644
 645     /** Returns a pointer to a thread context. */
 646     ThreadContext *tcBase(ThreadID tid = 0)
 647     {
 648         return thread[tid]->getTC();
 649     }
 650
 651     /** Count the Total Instructions Committed in the CPU. */
 652     virtual Counter totalInstructions() const
 653     {
 654         Counter total(0);
 655
 656         for (ThreadID tid = 0; tid < (ThreadID)thread.size(); tid++)
 657             total += thread[tid]->numInst;
 658
 659         return total;
 660     }
 661
 662 #if FULL_SYSTEM
 663     /** Pointer to the system. */
 664     System *system;
 665
 666     /** Pointer to physical memory. */
 667     PhysicalMemory *physmem;
 668 #endif
 669
 670     /** The global sequence number counter. */
 671     InstSeqNum globalSeqNum[ThePipeline::MaxThreads];
 672
 673 #ifdef DEBUG
 674     /** The global event number counter. */
 675     InstSeqNum cpuEventNum;
 676
 677     /** Number of resource requests active in CPU **/
 678     unsigned resReqCount;
 679
 680     Stats::Scalar maxResReqCount;
 681 #endif
 682
 683     /** Counter of how many stages have completed switching out. */
 684     int switchCount;
 685
 686     /** Pointers to all of the threads in the CPU. */
 687     std::vector<Thread *> thread;
 688
 689     /** Pointer to the icache interface. */
 690     MemInterface *icacheInterface;
 691
 692     /** Pointer to the dcache interface. */
 693     MemInterface *dcacheInterface;
 694
 695     /** Whether or not the CPU should defer its registration. */
 696     bool deferRegistration;
 697
 698     /** Per-Stage Instruction Tracing */
 699     bool stageTracing;
 700
 701     /** The cycle that the CPU was last running, used for statistics. */
 702     Tick lastRunningCycle;
 703
 704     /** Update Thread , used for statistic purposes*/
 705     inline void tickThreadStats();
 706
 707     /** Per-Thread Tick */
 708     Stats::Vector threadCycles;
 709
 710     /** Tick for SMT */
 711     Stats::Scalar smtCycles;
 712
 713     /** Stat for total number of times the CPU is descheduled. */
 714     Stats::Scalar timesIdled;
 715
 716     /** Stat for total number of cycles the CPU spends descheduled. */
 717     Stats::Scalar idleCycles;
 718
 719     /** Stat for the number of committed instructions per thread. */
 720     Stats::Vector committedInsts;
 721
 722     /** Stat for the number of committed instructions per thread. */
 723     Stats::Vector smtCommittedInsts;
 724
 725     /** Stat for the total number of committed instructions. */
 726     Stats::Scalar totalCommittedInsts;
 727
 728     /** Stat for the CPI per thread. */
 729     Stats::Formula cpi;
 730
 731     /** Stat for the SMT-CPI per thread. */
 732     Stats::Formula smtCpi;
 733
 734     /** Stat for the total CPI. */
 735     Stats::Formula totalCpi;
 736
 737     /** Stat for the IPC per thread. */
 738     Stats::Formula ipc;
 739
 740     /** Stat for the total IPC. */
 741     Stats::Formula smtIpc;
 742
 743     /** Stat for the total IPC. */
 744     Stats::Formula totalIpc;
 745 };
 746
 747 #endif // __CPU_O3_CPU_HH__