src/cpu/simple/base.cc

   1 /*
   2  * Copyright (c) 2010-2012 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  * All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions are
  19  * met: redistributions of source code must retain the above copyright
  20  * notice, this list of conditions and the following disclaimer;
  21  * redistributions in binary form must reproduce the above copyright
  22  * notice, this list of conditions and the following disclaimer in the
  23  * documentation and/or other materials provided with the distribution;
  24  * neither the name of the copyright holders nor the names of its
  25  * contributors may be used to endorse or promote products derived from
  26  * this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Authors: Steve Reinhardt
  41  */
  42
  43 #include "arch/kernel_stats.hh"
  44 #include "arch/stacktrace.hh"
  45 #include "arch/tlb.hh"
  46 #include "arch/utility.hh"
  47 #include "arch/vtophys.hh"
  48 #include "base/loader/symtab.hh"
  49 #include "base/cp_annotate.hh"
  50 #include "base/cprintf.hh"
  51 #include "base/inifile.hh"
  52 #include "base/misc.hh"
  53 #include "base/pollevent.hh"
  54 #include "base/trace.hh"
  55 #include "base/types.hh"
  56 #include "config/the_isa.hh"
  57 #include "cpu/simple/base.hh"
  58 #include "cpu/base.hh"
  59 #include "cpu/checker/cpu.hh"
  60 #include "cpu/checker/thread_context.hh"
  61 #include "cpu/exetrace.hh"
  62 #include "cpu/profile.hh"
  63 #include "cpu/simple_thread.hh"
  64 #include "cpu/smt.hh"
  65 #include "cpu/static_inst.hh"
  66 #include "cpu/thread_context.hh"
  67 #include "debug/Decode.hh"
  68 #include "debug/Fetch.hh"
  69 #include "debug/Quiesce.hh"
  70 #include "mem/mem_object.hh"
  71 #include "mem/packet.hh"
  72 #include "mem/request.hh"
  73 #include "params/BaseSimpleCPU.hh"
  74 #include "sim/byteswap.hh"
  75 #include "sim/debug.hh"
  76 #include "sim/faults.hh"
  77 #include "sim/full_system.hh"
  78 #include "sim/sim_events.hh"
  79 #include "sim/sim_object.hh"
  80 #include "sim/stats.hh"
  81 #include "sim/system.hh"
  82
  83 using namespace std;
  84 using namespace TheISA;
  85
  86 BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
  87     : BaseCPU(p), traceData(NULL), thread(NULL)
  88 {
  89     if (FullSystem)
  90         thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb,
  91                                   p->isa[0]);
  92     else
  93         thread = new SimpleThread(this, /* thread_num */ 0, p->system,
  94                                   p->workload[0], p->itb, p->dtb, p->isa[0]);
  95
  96     thread->setStatus(ThreadContext::Halted);
  97
  98     tc = thread->getTC();
  99
 100     if (p->checker) {
 101         BaseCPU *temp_checker = p->checker;
 102         checker = dynamic_cast<CheckerCPU *>(temp_checker);
 103         checker->setSystem(p->system);
 104         // Manipulate thread context
 105         ThreadContext *cpu_tc = tc;
 106         tc = new CheckerThreadContext<ThreadContext>(cpu_tc, this->checker);
 107     } else {
 108         checker = NULL;
 109     }
 110
 111     numInst = 0;
 112     startNumInst = 0;
 113     numOp = 0;
 114     startNumOp = 0;
 115     numLoad = 0;
 116     startNumLoad = 0;
 117     lastIcacheStall = 0;
 118     lastDcacheStall = 0;
 119
 120     threadContexts.push_back(tc);
 121
 122
 123     fetchOffset = 0;
 124     stayAtPC = false;
 125 }
 126
 127 BaseSimpleCPU::~BaseSimpleCPU()
 128 {
 129 }
 130
 131 void
 132 BaseSimpleCPU::deallocateContext(ThreadID thread_num)
 133 {
 134     // for now, these are equivalent
 135     suspendContext(thread_num);
 136 }
 137
 138
 139 void
 140 BaseSimpleCPU::haltContext(ThreadID thread_num)
 141 {
 142     // for now, these are equivalent
 143     suspendContext(thread_num);
 144 }
 145
 146
 147 void
 148 BaseSimpleCPU::regStats()
 149 {
 150     using namespace Stats;
 151
 152     BaseCPU::regStats();
 153
 154     numInsts
 155         .name(name() + ".committedInsts")
 156         .desc("Number of instructions committed")
 157         ;
 158
 159     numOps
 160         .name(name() + ".committedOps")
 161         .desc("Number of ops (including micro ops) committed")
 162         ;
 163
 164     numIntAluAccesses
 165         .name(name() + ".num_int_alu_accesses")
 166         .desc("Number of integer alu accesses")
 167         ;
 168
 169     numFpAluAccesses
 170         .name(name() + ".num_fp_alu_accesses")
 171         .desc("Number of float alu accesses")
 172         ;
 173
 174     numCallsReturns
 175         .name(name() + ".num_func_calls")
 176         .desc("number of times a function call or return occured")
 177         ;
 178
 179     numCondCtrlInsts
 180         .name(name() + ".num_conditional_control_insts")
 181         .desc("number of instructions that are conditional controls")
 182         ;
 183
 184     numIntInsts
 185         .name(name() + ".num_int_insts")
 186         .desc("number of integer instructions")
 187         ;
 188
 189     numFpInsts
 190         .name(name() + ".num_fp_insts")
 191         .desc("number of float instructions")
 192         ;
 193
 194     numIntRegReads
 195         .name(name() + ".num_int_register_reads")
 196         .desc("number of times the integer registers were read")
 197         ;
 198
 199     numIntRegWrites
 200         .name(name() + ".num_int_register_writes")
 201         .desc("number of times the integer registers were written")
 202         ;
 203
 204     numFpRegReads
 205         .name(name() + ".num_fp_register_reads")
 206         .desc("number of times the floating registers were read")
 207         ;
 208
 209     numFpRegWrites
 210         .name(name() + ".num_fp_register_writes")
 211         .desc("number of times the floating registers were written")
 212         ;
 213
 214     numMemRefs
 215         .name(name()+".num_mem_refs")
 216         .desc("number of memory refs")
 217         ;
 218
 219     numStoreInsts
 220         .name(name() + ".num_store_insts")
 221         .desc("Number of store instructions")
 222         ;
 223
 224     numLoadInsts
 225         .name(name() + ".num_load_insts")
 226         .desc("Number of load instructions")
 227         ;
 228
 229     notIdleFraction
 230         .name(name() + ".not_idle_fraction")
 231         .desc("Percentage of non-idle cycles")
 232         ;
 233
 234     idleFraction
 235         .name(name() + ".idle_fraction")
 236         .desc("Percentage of idle cycles")
 237         ;
 238
 239     numBusyCycles
 240         .name(name() + ".num_busy_cycles")
 241         .desc("Number of busy cycles")
 242         ;
 243
 244     numIdleCycles
 245         .name(name()+".num_idle_cycles")
 246         .desc("Number of idle cycles")
 247         ;
 248
 249     icacheStallCycles
 250         .name(name() + ".icache_stall_cycles")
 251         .desc("ICache total stall cycles")
 252         .prereq(icacheStallCycles)
 253         ;
 254
 255     dcacheStallCycles
 256         .name(name() + ".dcache_stall_cycles")
 257         .desc("DCache total stall cycles")
 258         .prereq(dcacheStallCycles)
 259         ;
 260
 261     icacheRetryCycles
 262         .name(name() + ".icache_retry_cycles")
 263         .desc("ICache total retry cycles")
 264         .prereq(icacheRetryCycles)
 265         ;
 266
 267     dcacheRetryCycles
 268         .name(name() + ".dcache_retry_cycles")
 269         .desc("DCache total retry cycles")
 270         .prereq(dcacheRetryCycles)
 271         ;
 272
 273     idleFraction = constant(1.0) - notIdleFraction;
 274     numIdleCycles = idleFraction * numCycles;
 275     numBusyCycles = (notIdleFraction)*numCycles;
 276 }
 277
 278 void
 279 BaseSimpleCPU::resetStats()
 280 {
 281 //    startNumInst = numInst;
 282      notIdleFraction = (_status != Idle);
 283 }
 284
 285 void
 286 BaseSimpleCPU::serializeThread(ostream &os, ThreadID tid)
 287 {
 288     assert(_status == Idle || _status == Running);
 289     assert(tid == 0);
 290
 291     thread->serialize(os);
 292 }
 293
 294 void
 295 BaseSimpleCPU::unserializeThread(Checkpoint *cp, const string &section,
 296                                  ThreadID tid)
 297 {
 298     if (tid != 0)
 299         fatal("Trying to load more than one thread into a SimpleCPU\n");
 300     thread->unserialize(cp, section);
 301 }
 302
 303 void
 304 change_thread_state(ThreadID tid, int activate, int priority)
 305 {
 306 }
 307
 308 Addr
 309 BaseSimpleCPU::dbg_vtophys(Addr addr)
 310 {
 311     return vtophys(tc, addr);
 312 }
 313
 314 void
 315 BaseSimpleCPU::wakeup()
 316 {
 317     if (thread->status() != ThreadContext::Suspended)
 318         return;
 319
 320     DPRINTF(Quiesce,"Suspended Processor awoke\n");
 321     thread->activate();
 322 }
 323
 324 void
 325 BaseSimpleCPU::checkForInterrupts()
 326 {
 327     if (checkInterrupts(tc)) {
 328         Fault interrupt = interrupts->getInterrupt(tc);
 329
 330         if (interrupt != NoFault) {
 331             fetchOffset = 0;
 332             interrupts->updateIntrInfo(tc);
 333             interrupt->invoke(tc);
 334             thread->decoder.reset();
 335         }
 336     }
 337 }
 338
 339
 340 void
 341 BaseSimpleCPU::setupFetchRequest(Request *req)
 342 {
 343     Addr instAddr = thread->instAddr();
 344
 345     // set up memory request for instruction fetch
 346     DPRINTF(Fetch, "Fetch: PC:%08p\n", instAddr);
 347
 348     Addr fetchPC = (instAddr & PCMask) + fetchOffset;
 349     req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, instMasterId(),
 350             instAddr);
 351 }
 352
 353
 354 void
 355 BaseSimpleCPU::preExecute()
 356 {
 357     // maintain $r0 semantics
 358     thread->setIntReg(ZeroReg, 0);
 359 #if THE_ISA == ALPHA_ISA
 360     thread->setFloatReg(ZeroReg, 0.0);
 361 #endif // ALPHA_ISA
 362
 363     // check for instruction-count-based events
 364     comInstEventQueue[0]->serviceEvents(numInst);
 365     system->instEventQueue.serviceEvents(system->totalNumInsts);
 366
 367     // decode the instruction
 368     inst = gtoh(inst);
 369
 370     TheISA::PCState pcState = thread->pcState();
 371
 372     if (isRomMicroPC(pcState.microPC())) {
 373         stayAtPC = false;
 374         curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(),
 375                                                   curMacroStaticInst);
 376     } else if (!curMacroStaticInst) {
 377         //We're not in the middle of a macro instruction
 378         StaticInstPtr instPtr = NULL;
 379
 380         TheISA::Decoder *decoder = &(thread->decoder);
 381
 382         //Predecode, ie bundle up an ExtMachInst
 383         //If more fetch data is needed, pass it in.
 384         Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset;
 385         //if(decoder->needMoreBytes())
 386             decoder->moreBytes(pcState, fetchPC, inst);
 387         //else
 388         //    decoder->process();
 389
 390         //Decode an instruction if one is ready. Otherwise, we'll have to
 391         //fetch beyond the MachInst at the current pc.
 392         instPtr = decoder->decode(pcState);
 393         if (instPtr) {
 394             stayAtPC = false;
 395             thread->pcState(pcState);
 396         } else {
 397             stayAtPC = true;
 398             fetchOffset += sizeof(MachInst);
 399         }
 400
 401         //If we decoded an instruction and it's microcoded, start pulling
 402         //out micro ops
 403         if (instPtr && instPtr->isMacroop()) {
 404             curMacroStaticInst = instPtr;
 405             curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC());
 406         } else {
 407             curStaticInst = instPtr;
 408         }
 409     } else {
 410         //Read the next micro op from the macro op
 411         curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC());
 412     }
 413
 414     //If we decoded an instruction this "tick", record information about it.
 415     if (curStaticInst) {
 416 #if TRACING_ON
 417         traceData = tracer->getInstRecord(curTick(), tc,
 418                 curStaticInst, thread->pcState(), curMacroStaticInst);
 419
 420         DPRINTF(Decode,"Decode: Decoded %s instruction: %#x\n",
 421                 curStaticInst->getName(), curStaticInst->machInst);
 422 #endif // TRACING_ON
 423     }
 424 }
 425
 426 void
 427 BaseSimpleCPU::postExecute()
 428 {
 429     assert(curStaticInst);
 430
 431     TheISA::PCState pc = tc->pcState();
 432     Addr instAddr = pc.instAddr();
 433     if (FullSystem && thread->profile) {
 434         bool usermode = TheISA::inUserMode(tc);
 435         thread->profilePC = usermode ? 1 : instAddr;
 436         ProfileNode *node = thread->profile->consume(tc, curStaticInst);
 437         if (node)
 438             thread->profileNode = node;
 439     }
 440
 441     if (curStaticInst->isMemRef()) {
 442         numMemRefs++;
 443     }
 444
 445     if (curStaticInst->isLoad()) {
 446         ++numLoad;
 447         comLoadEventQueue[0]->serviceEvents(numLoad);
 448     }
 449
 450     if (CPA::available()) {
 451         CPA::cpa()->swAutoBegin(tc, pc.nextInstAddr());
 452     }
 453
 454     /* Power model statistics */
 455     //integer alu accesses
 456     if (curStaticInst->isInteger()){
 457         numIntAluAccesses++;
 458         numIntInsts++;
 459     }
 460
 461     //float alu accesses
 462     if (curStaticInst->isFloating()){
 463         numFpAluAccesses++;
 464         numFpInsts++;
 465     }
 466
 467     //number of function calls/returns to get window accesses
 468     if (curStaticInst->isCall() || curStaticInst->isReturn()){
 469         numCallsReturns++;
 470     }
 471
 472     //the number of branch predictions that will be made
 473     if (curStaticInst->isCondCtrl()){
 474         numCondCtrlInsts++;
 475     }
 476
 477     //result bus acceses
 478     if (curStaticInst->isLoad()){
 479         numLoadInsts++;
 480     }
 481
 482     if (curStaticInst->isStore()){
 483         numStoreInsts++;
 484     }
 485     /* End power model statistics */
 486
 487     if (FullSystem)
 488         traceFunctions(instAddr);
 489
 490     if (traceData) {
 491         traceData->dump();
 492         delete traceData;
 493         traceData = NULL;
 494     }
 495 }
 496
 497
 498 void
 499 BaseSimpleCPU::advancePC(Fault fault)
 500 {
 501     //Since we're moving to a new pc, zero out the offset
 502     fetchOffset = 0;
 503     if (fault != NoFault) {
 504         curMacroStaticInst = StaticInst::nullStaticInstPtr;
 505         fault->invoke(tc, curStaticInst);
 506         thread->decoder.reset();
 507     } else {
 508         if (curStaticInst) {
 509             if (curStaticInst->isLastMicroop())
 510                 curMacroStaticInst = StaticInst::nullStaticInstPtr;
 511             TheISA::PCState pcState = thread->pcState();
 512             TheISA::advancePC(pcState, curStaticInst);
 513             thread->pcState(pcState);
 514         }
 515     }
 516 }
 517
 518 /*Fault
 519 BaseSimpleCPU::CacheOp(uint8_t Op, Addr EffAddr)
 520 {
 521     // translate to physical address
 522     Fault fault = NoFault;
 523     int CacheID = Op & 0x3; // Lower 3 bits identify Cache
 524     int CacheOP = Op >> 2; // Upper 3 bits identify Cache Operation
 525     if(CacheID > 1)
 526       {
 527         warn("CacheOps not implemented for secondary/tertiary caches\n");
 528       }
 529     else
 530       {
 531         switch(CacheOP)
 532           { // Fill Packet Type
 533           case 0: warn("Invalidate Cache Op\n");
 534             break;
 535           case 1: warn("Index Load Tag Cache Op\n");
 536             break;
 537           case 2: warn("Index Store Tag Cache Op\n");
 538             break;
 539           case 4: warn("Hit Invalidate Cache Op\n");
 540             break;
 541           case 5: warn("Fill/Hit Writeback Invalidate Cache Op\n");
 542             break;
 543           case 6: warn("Hit Writeback\n");
 544             break;
 545           case 7: warn("Fetch & Lock Cache Op\n");
 546             break;
 547           default: warn("Unimplemented Cache Op\n");
 548           }
 549       }
 550     return fault;
 551 }*/