timing.cc revision 10596:1eec33d2fc52
1/* 2 * Copyright 2014 Google, Inc. 3 * Copyright (c) 2010-2013 ARM Limited 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) 2002-2005 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: Steve Reinhardt 42 */ 43 44#include "arch/locked_mem.hh" 45#include "arch/mmapped_ipr.hh" 46#include "arch/utility.hh" 47#include "base/bigint.hh" 48#include "config/the_isa.hh" 49#include "cpu/simple/timing.hh" 50#include "cpu/exetrace.hh" 51#include "debug/Config.hh" 52#include "debug/Drain.hh" 53#include "debug/ExecFaulting.hh" 54#include "debug/SimpleCPU.hh" 55#include "mem/packet.hh" 56#include "mem/packet_access.hh" 57#include "params/TimingSimpleCPU.hh" 58#include "sim/faults.hh" 59#include "sim/full_system.hh" 60#include "sim/system.hh" 61 62#include "debug/Mwait.hh" 63 64using namespace std; 65using namespace TheISA; 66 67void 68TimingSimpleCPU::init() 69{ 70 BaseCPU::init(); 71 72 // Initialise the ThreadContext's memory proxies 73 tcBase()->initMemProxies(tcBase()); 74 75 if (FullSystem && !params()->switched_out) { 76 for (int i = 0; i < threadContexts.size(); ++i) { 77 ThreadContext *tc = threadContexts[i]; 78 // initialize CPU, including PC 79 TheISA::initCPU(tc, _cpuId); 80 } 81 } 82} 83 84void 85TimingSimpleCPU::TimingCPUPort::TickEvent::schedule(PacketPtr _pkt, Tick t) 86{ 87 pkt = _pkt; 88 cpu->schedule(this, t); 89} 90 91TimingSimpleCPU::TimingSimpleCPU(TimingSimpleCPUParams *p) 92 : BaseSimpleCPU(p), fetchTranslation(this), icachePort(this), 93 dcachePort(this), ifetch_pkt(NULL), dcache_pkt(NULL), previousCycle(0), 94 fetchEvent(this), drainManager(NULL) 95{ 96 _status = Idle; 97 98 system->totalNumInsts = 0; 99} 100 101 102 103TimingSimpleCPU::~TimingSimpleCPU() 104{ 105} 106 107unsigned int 108TimingSimpleCPU::drain(DrainManager *drain_manager) 109{ 110 assert(!drainManager); 111 if (switchedOut()) 112 return 0; 113 114 if (_status == Idle || 115 (_status == BaseSimpleCPU::Running && isDrained())) { 116 DPRINTF(Drain, "No need to drain.\n"); 117 return 0; 118 } else { 119 drainManager = drain_manager; 120 DPRINTF(Drain, "Requesting drain: %s\n", pcState()); 121 122 // The fetch event can become descheduled if a drain didn't 123 // succeed on the first attempt. We need to reschedule it if 124 // the CPU is waiting for a microcode routine to complete. 125 if (_status == BaseSimpleCPU::Running && !fetchEvent.scheduled()) 126 schedule(fetchEvent, clockEdge()); 127 128 return 1; 129 } 130} 131 132void 133TimingSimpleCPU::drainResume() 134{ 135 assert(!fetchEvent.scheduled()); 136 assert(!drainManager); 137 if (switchedOut()) 138 return; 139 140 DPRINTF(SimpleCPU, "Resume\n"); 141 verifyMemoryMode(); 142 143 assert(!threadContexts.empty()); 144 if (threadContexts.size() > 1) 145 fatal("The timing CPU only supports one thread.\n"); 146 147 if (thread->status() == ThreadContext::Active) { 148 schedule(fetchEvent, nextCycle()); 149 _status = BaseSimpleCPU::Running; 150 notIdleFraction = 1; 151 } else { 152 _status = BaseSimpleCPU::Idle; 153 notIdleFraction = 0; 154 } 155} 156 157bool 158TimingSimpleCPU::tryCompleteDrain() 159{ 160 if (!drainManager) 161 return false; 162 163 DPRINTF(Drain, "tryCompleteDrain: %s\n", pcState()); 164 if (!isDrained()) 165 return false; 166 167 DPRINTF(Drain, "CPU done draining, processing drain event\n"); 168 drainManager->signalDrainDone(); 169 drainManager = NULL; 170 171 return true; 172} 173 174void 175TimingSimpleCPU::switchOut() 176{ 177 BaseSimpleCPU::switchOut(); 178 179 assert(!fetchEvent.scheduled()); 180 assert(_status == BaseSimpleCPU::Running || _status == Idle); 181 assert(!stayAtPC); 182 assert(microPC() == 0); 183 184 updateCycleCounts(); 185} 186 187 188void 189TimingSimpleCPU::takeOverFrom(BaseCPU *oldCPU) 190{ 191 BaseSimpleCPU::takeOverFrom(oldCPU); 192 193 previousCycle = curCycle(); 194} 195 196void 197TimingSimpleCPU::verifyMemoryMode() const 198{ 199 if (!system->isTimingMode()) { 200 fatal("The timing CPU requires the memory system to be in " 201 "'timing' mode.\n"); 202 } 203} 204 205void 206TimingSimpleCPU::activateContext(ThreadID thread_num) 207{ 208 DPRINTF(SimpleCPU, "ActivateContext %d\n", thread_num); 209 210 assert(thread_num == 0); 211 assert(thread); 212 213 assert(_status == Idle); 214 215 notIdleFraction = 1; 216 _status = BaseSimpleCPU::Running; 217 218 // kick things off by initiating the fetch of the next instruction 219 schedule(fetchEvent, clockEdge(Cycles(0))); 220} 221 222 223void 224TimingSimpleCPU::suspendContext(ThreadID thread_num) 225{ 226 DPRINTF(SimpleCPU, "SuspendContext %d\n", thread_num); 227 228 assert(thread_num == 0); 229 assert(thread); 230 231 if (_status == Idle) 232 return; 233 234 assert(_status == BaseSimpleCPU::Running); 235 236 // just change status to Idle... if status != Running, 237 // completeInst() will not initiate fetch of next instruction. 238 239 notIdleFraction = 0; 240 _status = Idle; 241} 242 243bool 244TimingSimpleCPU::handleReadPacket(PacketPtr pkt) 245{ 246 RequestPtr req = pkt->req; 247 248 // We're about the issues a locked load, so tell the monitor 249 // to start caring about this address 250 if (pkt->isRead() && pkt->req->isLLSC()) { 251 TheISA::handleLockedRead(thread, pkt->req); 252 } 253 if (req->isMmappedIpr()) { 254 Cycles delay = TheISA::handleIprRead(thread->getTC(), pkt); 255 new IprEvent(pkt, this, clockEdge(delay)); 256 _status = DcacheWaitResponse; 257 dcache_pkt = NULL; 258 } else if (!dcachePort.sendTimingReq(pkt)) { 259 _status = DcacheRetry; 260 dcache_pkt = pkt; 261 } else { 262 _status = DcacheWaitResponse; 263 // memory system takes ownership of packet 264 dcache_pkt = NULL; 265 } 266 return dcache_pkt == NULL; 267} 268 269void 270TimingSimpleCPU::sendData(RequestPtr req, uint8_t *data, uint64_t *res, 271 bool read) 272{ 273 PacketPtr pkt; 274 buildPacket(pkt, req, read); 275 pkt->dataDynamic<uint8_t>(data); 276 if (req->getFlags().isSet(Request::NO_ACCESS)) { 277 assert(!dcache_pkt); 278 pkt->makeResponse(); 279 completeDataAccess(pkt); 280 } else if (read) { 281 handleReadPacket(pkt); 282 } else { 283 bool do_access = true; // flag to suppress cache access 284 285 if (req->isLLSC()) { 286 do_access = TheISA::handleLockedWrite(thread, req, dcachePort.cacheBlockMask); 287 } else if (req->isCondSwap()) { 288 assert(res); 289 req->setExtraData(*res); 290 } 291 292 if (do_access) { 293 dcache_pkt = pkt; 294 handleWritePacket(); 295 } else { 296 _status = DcacheWaitResponse; 297 completeDataAccess(pkt); 298 } 299 } 300} 301 302void 303TimingSimpleCPU::sendSplitData(RequestPtr req1, RequestPtr req2, 304 RequestPtr req, uint8_t *data, bool read) 305{ 306 PacketPtr pkt1, pkt2; 307 buildSplitPacket(pkt1, pkt2, req1, req2, req, data, read); 308 if (req->getFlags().isSet(Request::NO_ACCESS)) { 309 assert(!dcache_pkt); 310 pkt1->makeResponse(); 311 completeDataAccess(pkt1); 312 } else if (read) { 313 SplitFragmentSenderState * send_state = 314 dynamic_cast<SplitFragmentSenderState *>(pkt1->senderState); 315 if (handleReadPacket(pkt1)) { 316 send_state->clearFromParent(); 317 send_state = dynamic_cast<SplitFragmentSenderState *>( 318 pkt2->senderState); 319 if (handleReadPacket(pkt2)) { 320 send_state->clearFromParent(); 321 } 322 } 323 } else { 324 dcache_pkt = pkt1; 325 SplitFragmentSenderState * send_state = 326 dynamic_cast<SplitFragmentSenderState *>(pkt1->senderState); 327 if (handleWritePacket()) { 328 send_state->clearFromParent(); 329 dcache_pkt = pkt2; 330 send_state = dynamic_cast<SplitFragmentSenderState *>( 331 pkt2->senderState); 332 if (handleWritePacket()) { 333 send_state->clearFromParent(); 334 } 335 } 336 } 337} 338 339void 340TimingSimpleCPU::translationFault(const Fault &fault) 341{ 342 // fault may be NoFault in cases where a fault is suppressed, 343 // for instance prefetches. 344 updateCycleCounts(); 345 346 if (traceData) { 347 // Since there was a fault, we shouldn't trace this instruction. 348 delete traceData; 349 traceData = NULL; 350 } 351 352 postExecute(); 353 354 advanceInst(fault); 355} 356 357void 358TimingSimpleCPU::buildPacket(PacketPtr &pkt, RequestPtr req, bool read) 359{ 360 pkt = read ? Packet::createRead(req) : Packet::createWrite(req); 361} 362 363void 364TimingSimpleCPU::buildSplitPacket(PacketPtr &pkt1, PacketPtr &pkt2, 365 RequestPtr req1, RequestPtr req2, RequestPtr req, 366 uint8_t *data, bool read) 367{ 368 pkt1 = pkt2 = NULL; 369 370 assert(!req1->isMmappedIpr() && !req2->isMmappedIpr()); 371 372 if (req->getFlags().isSet(Request::NO_ACCESS)) { 373 buildPacket(pkt1, req, read); 374 return; 375 } 376 377 buildPacket(pkt1, req1, read); 378 buildPacket(pkt2, req2, read); 379 380 req->setPhys(req1->getPaddr(), req->getSize(), req1->getFlags(), dataMasterId()); 381 PacketPtr pkt = new Packet(req, pkt1->cmd.responseCommand()); 382 383 pkt->dataDynamic<uint8_t>(data); 384 pkt1->dataStatic<uint8_t>(data); 385 pkt2->dataStatic<uint8_t>(data + req1->getSize()); 386 387 SplitMainSenderState * main_send_state = new SplitMainSenderState; 388 pkt->senderState = main_send_state; 389 main_send_state->fragments[0] = pkt1; 390 main_send_state->fragments[1] = pkt2; 391 main_send_state->outstanding = 2; 392 pkt1->senderState = new SplitFragmentSenderState(pkt, 0); 393 pkt2->senderState = new SplitFragmentSenderState(pkt, 1); 394} 395 396Fault 397TimingSimpleCPU::readMem(Addr addr, uint8_t *data, 398 unsigned size, unsigned flags) 399{ 400 Fault fault; 401 const int asid = 0; 402 const ThreadID tid = 0; 403 const Addr pc = thread->instAddr(); 404 unsigned block_size = cacheLineSize(); 405 BaseTLB::Mode mode = BaseTLB::Read; 406 407 if (traceData) { 408 traceData->setAddr(addr); 409 } 410 411 RequestPtr req = new Request(asid, addr, size, 412 flags, dataMasterId(), pc, _cpuId, tid); 413 414 req->taskId(taskId()); 415 416 Addr split_addr = roundDown(addr + size - 1, block_size); 417 assert(split_addr <= addr || split_addr - addr < block_size); 418 419 _status = DTBWaitResponse; 420 if (split_addr > addr) { 421 RequestPtr req1, req2; 422 assert(!req->isLLSC() && !req->isSwap()); 423 req->splitOnVaddr(split_addr, req1, req2); 424 425 WholeTranslationState *state = 426 new WholeTranslationState(req, req1, req2, new uint8_t[size], 427 NULL, mode); 428 DataTranslation<TimingSimpleCPU *> *trans1 = 429 new DataTranslation<TimingSimpleCPU *>(this, state, 0); 430 DataTranslation<TimingSimpleCPU *> *trans2 = 431 new DataTranslation<TimingSimpleCPU *>(this, state, 1); 432 433 thread->dtb->translateTiming(req1, tc, trans1, mode); 434 thread->dtb->translateTiming(req2, tc, trans2, mode); 435 } else { 436 WholeTranslationState *state = 437 new WholeTranslationState(req, new uint8_t[size], NULL, mode); 438 DataTranslation<TimingSimpleCPU *> *translation 439 = new DataTranslation<TimingSimpleCPU *>(this, state); 440 thread->dtb->translateTiming(req, tc, translation, mode); 441 } 442 443 return NoFault; 444} 445 446bool 447TimingSimpleCPU::handleWritePacket() 448{ 449 RequestPtr req = dcache_pkt->req; 450 if (req->isMmappedIpr()) { 451 Cycles delay = TheISA::handleIprWrite(thread->getTC(), dcache_pkt); 452 new IprEvent(dcache_pkt, this, clockEdge(delay)); 453 _status = DcacheWaitResponse; 454 dcache_pkt = NULL; 455 } else if (!dcachePort.sendTimingReq(dcache_pkt)) { 456 _status = DcacheRetry; 457 } else { 458 _status = DcacheWaitResponse; 459 // memory system takes ownership of packet 460 dcache_pkt = NULL; 461 } 462 return dcache_pkt == NULL; 463} 464 465Fault 466TimingSimpleCPU::writeMem(uint8_t *data, unsigned size, 467 Addr addr, unsigned flags, uint64_t *res) 468{ 469 uint8_t *newData = new uint8_t[size]; 470 const int asid = 0; 471 const ThreadID tid = 0; 472 const Addr pc = thread->instAddr(); 473 unsigned block_size = cacheLineSize(); 474 BaseTLB::Mode mode = BaseTLB::Write; 475 476 if (data == NULL) { 477 assert(flags & Request::CACHE_BLOCK_ZERO); 478 // This must be a cache block cleaning request 479 memset(newData, 0, size); 480 } else { 481 memcpy(newData, data, size); 482 } 483 484 if (traceData) { 485 traceData->setAddr(addr); 486 } 487 488 RequestPtr req = new Request(asid, addr, size, 489 flags, dataMasterId(), pc, _cpuId, tid); 490 491 req->taskId(taskId()); 492 493 Addr split_addr = roundDown(addr + size - 1, block_size); 494 assert(split_addr <= addr || split_addr - addr < block_size); 495 496 _status = DTBWaitResponse; 497 if (split_addr > addr) { 498 RequestPtr req1, req2; 499 assert(!req->isLLSC() && !req->isSwap()); 500 req->splitOnVaddr(split_addr, req1, req2); 501 502 WholeTranslationState *state = 503 new WholeTranslationState(req, req1, req2, newData, res, mode); 504 DataTranslation<TimingSimpleCPU *> *trans1 = 505 new DataTranslation<TimingSimpleCPU *>(this, state, 0); 506 DataTranslation<TimingSimpleCPU *> *trans2 = 507 new DataTranslation<TimingSimpleCPU *>(this, state, 1); 508 509 thread->dtb->translateTiming(req1, tc, trans1, mode); 510 thread->dtb->translateTiming(req2, tc, trans2, mode); 511 } else { 512 WholeTranslationState *state = 513 new WholeTranslationState(req, newData, res, mode); 514 DataTranslation<TimingSimpleCPU *> *translation = 515 new DataTranslation<TimingSimpleCPU *>(this, state); 516 thread->dtb->translateTiming(req, tc, translation, mode); 517 } 518 519 // Translation faults will be returned via finishTranslation() 520 return NoFault; 521} 522 523 524void 525TimingSimpleCPU::finishTranslation(WholeTranslationState *state) 526{ 527 _status = BaseSimpleCPU::Running; 528 529 if (state->getFault() != NoFault) { 530 if (state->isPrefetch()) { 531 state->setNoFault(); 532 } 533 delete [] state->data; 534 state->deleteReqs(); 535 translationFault(state->getFault()); 536 } else { 537 if (!state->isSplit) { 538 sendData(state->mainReq, state->data, state->res, 539 state->mode == BaseTLB::Read); 540 } else { 541 sendSplitData(state->sreqLow, state->sreqHigh, state->mainReq, 542 state->data, state->mode == BaseTLB::Read); 543 } 544 } 545 546 delete state; 547} 548 549 550void 551TimingSimpleCPU::fetch() 552{ 553 DPRINTF(SimpleCPU, "Fetch\n"); 554 555 if (!curStaticInst || !curStaticInst->isDelayedCommit()) { 556 checkForInterrupts(); 557 checkPcEventQueue(); 558 } 559 560 // We must have just got suspended by a PC event 561 if (_status == Idle) 562 return; 563 564 TheISA::PCState pcState = thread->pcState(); 565 bool needToFetch = !isRomMicroPC(pcState.microPC()) && !curMacroStaticInst; 566 567 if (needToFetch) { 568 _status = BaseSimpleCPU::Running; 569 Request *ifetch_req = new Request(); 570 ifetch_req->taskId(taskId()); 571 ifetch_req->setThreadContext(_cpuId, /* thread ID */ 0); 572 setupFetchRequest(ifetch_req); 573 DPRINTF(SimpleCPU, "Translating address %#x\n", ifetch_req->getVaddr()); 574 thread->itb->translateTiming(ifetch_req, tc, &fetchTranslation, 575 BaseTLB::Execute); 576 } else { 577 _status = IcacheWaitResponse; 578 completeIfetch(NULL); 579 580 updateCycleCounts(); 581 } 582} 583 584 585void 586TimingSimpleCPU::sendFetch(const Fault &fault, RequestPtr req, 587 ThreadContext *tc) 588{ 589 if (fault == NoFault) { 590 DPRINTF(SimpleCPU, "Sending fetch for addr %#x(pa: %#x)\n", 591 req->getVaddr(), req->getPaddr()); 592 ifetch_pkt = new Packet(req, MemCmd::ReadReq); 593 ifetch_pkt->dataStatic(&inst); 594 DPRINTF(SimpleCPU, " -- pkt addr: %#x\n", ifetch_pkt->getAddr()); 595 596 if (!icachePort.sendTimingReq(ifetch_pkt)) { 597 // Need to wait for retry 598 _status = IcacheRetry; 599 } else { 600 // Need to wait for cache to respond 601 _status = IcacheWaitResponse; 602 // ownership of packet transferred to memory system 603 ifetch_pkt = NULL; 604 } 605 } else { 606 DPRINTF(SimpleCPU, "Translation of addr %#x faulted\n", req->getVaddr()); 607 delete req; 608 // fetch fault: advance directly to next instruction (fault handler) 609 _status = BaseSimpleCPU::Running; 610 advanceInst(fault); 611 } 612 613 updateCycleCounts(); 614} 615 616 617void 618TimingSimpleCPU::advanceInst(const Fault &fault) 619{ 620 if (_status == Faulting) 621 return; 622 623 if (fault != NoFault) { 624 advancePC(fault); 625 DPRINTF(SimpleCPU, "Fault occured, scheduling fetch event\n"); 626 reschedule(fetchEvent, clockEdge(), true); 627 _status = Faulting; 628 return; 629 } 630 631 632 if (!stayAtPC) 633 advancePC(fault); 634 635 if (tryCompleteDrain()) 636 return; 637 638 if (_status == BaseSimpleCPU::Running) { 639 // kick off fetch of next instruction... callback from icache 640 // response will cause that instruction to be executed, 641 // keeping the CPU running. 642 fetch(); 643 } 644} 645 646 647void 648TimingSimpleCPU::completeIfetch(PacketPtr pkt) 649{ 650 DPRINTF(SimpleCPU, "Complete ICache Fetch for addr %#x\n", pkt ? 651 pkt->getAddr() : 0); 652 653 // received a response from the icache: execute the received 654 // instruction 655 assert(!pkt || !pkt->isError()); 656 assert(_status == IcacheWaitResponse); 657 658 _status = BaseSimpleCPU::Running; 659 660 updateCycleCounts(); 661 662 if (pkt) 663 pkt->req->setAccessLatency(); 664 665 666 preExecute(); 667 if (curStaticInst && curStaticInst->isMemRef()) { 668 // load or store: just send to dcache 669 Fault fault = curStaticInst->initiateAcc(this, traceData); 670 671 // If we're not running now the instruction will complete in a dcache 672 // response callback or the instruction faulted and has started an 673 // ifetch 674 if (_status == BaseSimpleCPU::Running) { 675 if (fault != NoFault && traceData) { 676 // If there was a fault, we shouldn't trace this instruction. 677 delete traceData; 678 traceData = NULL; 679 } 680 681 postExecute(); 682 // @todo remove me after debugging with legion done 683 if (curStaticInst && (!curStaticInst->isMicroop() || 684 curStaticInst->isFirstMicroop())) 685 instCnt++; 686 advanceInst(fault); 687 } 688 } else if (curStaticInst) { 689 // non-memory instruction: execute completely now 690 Fault fault = curStaticInst->execute(this, traceData); 691 692 // keep an instruction count 693 if (fault == NoFault) 694 countInst(); 695 else if (traceData && !DTRACE(ExecFaulting)) { 696 delete traceData; 697 traceData = NULL; 698 } 699 700 postExecute(); 701 // @todo remove me after debugging with legion done 702 if (curStaticInst && (!curStaticInst->isMicroop() || 703 curStaticInst->isFirstMicroop())) 704 instCnt++; 705 advanceInst(fault); 706 } else { 707 advanceInst(NoFault); 708 } 709 710 if (pkt) { 711 delete pkt->req; 712 delete pkt; 713 } 714} 715 716void 717TimingSimpleCPU::IcachePort::ITickEvent::process() 718{ 719 cpu->completeIfetch(pkt); 720} 721 722bool 723TimingSimpleCPU::IcachePort::recvTimingResp(PacketPtr pkt) 724{ 725 DPRINTF(SimpleCPU, "Received timing response %#x\n", pkt->getAddr()); 726 // delay processing of returned data until next CPU clock edge 727 Tick next_tick = cpu->clockEdge(); 728 729 if (next_tick == curTick()) 730 cpu->completeIfetch(pkt); 731 else 732 tickEvent.schedule(pkt, next_tick); 733 734 return true; 735} 736 737void 738TimingSimpleCPU::IcachePort::recvRetry() 739{ 740 // we shouldn't get a retry unless we have a packet that we're 741 // waiting to transmit 742 assert(cpu->ifetch_pkt != NULL); 743 assert(cpu->_status == IcacheRetry); 744 PacketPtr tmp = cpu->ifetch_pkt; 745 if (sendTimingReq(tmp)) { 746 cpu->_status = IcacheWaitResponse; 747 cpu->ifetch_pkt = NULL; 748 } 749} 750 751void 752TimingSimpleCPU::completeDataAccess(PacketPtr pkt) 753{ 754 // received a response from the dcache: complete the load or store 755 // instruction 756 assert(!pkt->isError()); 757 assert(_status == DcacheWaitResponse || _status == DTBWaitResponse || 758 pkt->req->getFlags().isSet(Request::NO_ACCESS)); 759 760 pkt->req->setAccessLatency(); 761 762 updateCycleCounts(); 763 764 if (pkt->senderState) { 765 SplitFragmentSenderState * send_state = 766 dynamic_cast<SplitFragmentSenderState *>(pkt->senderState); 767 assert(send_state); 768 delete pkt->req; 769 delete pkt; 770 PacketPtr big_pkt = send_state->bigPkt; 771 delete send_state; 772 773 SplitMainSenderState * main_send_state = 774 dynamic_cast<SplitMainSenderState *>(big_pkt->senderState); 775 assert(main_send_state); 776 // Record the fact that this packet is no longer outstanding. 777 assert(main_send_state->outstanding != 0); 778 main_send_state->outstanding--; 779 780 if (main_send_state->outstanding) { 781 return; 782 } else { 783 delete main_send_state; 784 big_pkt->senderState = NULL; 785 pkt = big_pkt; 786 } 787 } 788 789 _status = BaseSimpleCPU::Running; 790 791 Fault fault = curStaticInst->completeAcc(pkt, this, traceData); 792 793 // keep an instruction count 794 if (fault == NoFault) 795 countInst(); 796 else if (traceData) { 797 // If there was a fault, we shouldn't trace this instruction. 798 delete traceData; 799 traceData = NULL; 800 } 801 802 delete pkt->req; 803 delete pkt; 804 805 postExecute(); 806 807 advanceInst(fault); 808} 809 810void 811TimingSimpleCPU::updateCycleCounts() 812{ 813 const Cycles delta(curCycle() - previousCycle); 814 815 numCycles += delta; 816 ppCycles->notify(delta); 817 818 previousCycle = curCycle(); 819} 820 821void 822TimingSimpleCPU::DcachePort::recvTimingSnoopReq(PacketPtr pkt) 823{ 824 // X86 ISA: Snooping an invalidation for monitor/mwait 825 if(cpu->getAddrMonitor()->doMonitor(pkt)) { 826 cpu->wakeup(); 827 } 828 TheISA::handleLockedSnoop(cpu->thread, pkt, cacheBlockMask); 829} 830 831void 832TimingSimpleCPU::DcachePort::recvFunctionalSnoop(PacketPtr pkt) 833{ 834 // X86 ISA: Snooping an invalidation for monitor/mwait 835 if(cpu->getAddrMonitor()->doMonitor(pkt)) { 836 cpu->wakeup(); 837 } 838} 839 840bool 841TimingSimpleCPU::DcachePort::recvTimingResp(PacketPtr pkt) 842{ 843 // delay processing of returned data until next CPU clock edge 844 Tick next_tick = cpu->clockEdge(); 845 846 if (next_tick == curTick()) { 847 cpu->completeDataAccess(pkt); 848 } else { 849 if (!tickEvent.scheduled()) { 850 tickEvent.schedule(pkt, next_tick); 851 } else { 852 // In the case of a split transaction and a cache that is 853 // faster than a CPU we could get two responses before 854 // next_tick expires 855 if (!retryEvent.scheduled()) 856 cpu->schedule(retryEvent, next_tick); 857 return false; 858 } 859 } 860 861 return true; 862} 863 864void 865TimingSimpleCPU::DcachePort::DTickEvent::process() 866{ 867 cpu->completeDataAccess(pkt); 868} 869 870void 871TimingSimpleCPU::DcachePort::recvRetry() 872{ 873 // we shouldn't get a retry unless we have a packet that we're 874 // waiting to transmit 875 assert(cpu->dcache_pkt != NULL); 876 assert(cpu->_status == DcacheRetry); 877 PacketPtr tmp = cpu->dcache_pkt; 878 if (tmp->senderState) { 879 // This is a packet from a split access. 880 SplitFragmentSenderState * send_state = 881 dynamic_cast<SplitFragmentSenderState *>(tmp->senderState); 882 assert(send_state); 883 PacketPtr big_pkt = send_state->bigPkt; 884 885 SplitMainSenderState * main_send_state = 886 dynamic_cast<SplitMainSenderState *>(big_pkt->senderState); 887 assert(main_send_state); 888 889 if (sendTimingReq(tmp)) { 890 // If we were able to send without retrying, record that fact 891 // and try sending the other fragment. 892 send_state->clearFromParent(); 893 int other_index = main_send_state->getPendingFragment(); 894 if (other_index > 0) { 895 tmp = main_send_state->fragments[other_index]; 896 cpu->dcache_pkt = tmp; 897 if ((big_pkt->isRead() && cpu->handleReadPacket(tmp)) || 898 (big_pkt->isWrite() && cpu->handleWritePacket())) { 899 main_send_state->fragments[other_index] = NULL; 900 } 901 } else { 902 cpu->_status = DcacheWaitResponse; 903 // memory system takes ownership of packet 904 cpu->dcache_pkt = NULL; 905 } 906 } 907 } else if (sendTimingReq(tmp)) { 908 cpu->_status = DcacheWaitResponse; 909 // memory system takes ownership of packet 910 cpu->dcache_pkt = NULL; 911 } 912} 913 914TimingSimpleCPU::IprEvent::IprEvent(Packet *_pkt, TimingSimpleCPU *_cpu, 915 Tick t) 916 : pkt(_pkt), cpu(_cpu) 917{ 918 cpu->schedule(this, t); 919} 920 921void 922TimingSimpleCPU::IprEvent::process() 923{ 924 cpu->completeDataAccess(pkt); 925} 926 927const char * 928TimingSimpleCPU::IprEvent::description() const 929{ 930 return "Timing Simple CPU Delay IPR event"; 931} 932 933 934void 935TimingSimpleCPU::printAddr(Addr a) 936{ 937 dcachePort.printAddr(a); 938} 939 940 941//////////////////////////////////////////////////////////////////////// 942// 943// TimingSimpleCPU Simulation Object 944// 945TimingSimpleCPU * 946TimingSimpleCPUParams::create() 947{ 948 numThreads = 1; 949 if (!FullSystem && workload.size() != 1) 950 panic("only one workload allowed"); 951 return new TimingSimpleCPU(this); 952} 953