table_walker.cc revision 14088
1/* 2 * Copyright (c) 2010, 2012-2018 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 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Ali Saidi 38 * Giacomo Gabrielli 39 */ 40#include "arch/arm/table_walker.hh" 41 42#include <memory> 43 44#include "arch/arm/faults.hh" 45#include "arch/arm/stage2_mmu.hh" 46#include "arch/arm/system.hh" 47#include "arch/arm/tlb.hh" 48#include "cpu/base.hh" 49#include "cpu/thread_context.hh" 50#include "debug/Checkpoint.hh" 51#include "debug/Drain.hh" 52#include "debug/TLB.hh" 53#include "debug/TLBVerbose.hh" 54#include "dev/dma_device.hh" 55#include "sim/system.hh" 56 57using namespace ArmISA; 58 59TableWalker::TableWalker(const Params *p) 60 : ClockedObject(p), 61 stage2Mmu(NULL), port(NULL), masterId(Request::invldMasterId), 62 isStage2(p->is_stage2), tlb(NULL), 63 currState(NULL), pending(false), 64 numSquashable(p->num_squash_per_cycle), 65 pendingReqs(0), 66 pendingChangeTick(curTick()), 67 doL1DescEvent([this]{ doL1DescriptorWrapper(); }, name()), 68 doL2DescEvent([this]{ doL2DescriptorWrapper(); }, name()), 69 doL0LongDescEvent([this]{ doL0LongDescriptorWrapper(); }, name()), 70 doL1LongDescEvent([this]{ doL1LongDescriptorWrapper(); }, name()), 71 doL2LongDescEvent([this]{ doL2LongDescriptorWrapper(); }, name()), 72 doL3LongDescEvent([this]{ doL3LongDescriptorWrapper(); }, name()), 73 LongDescEventByLevel { &doL0LongDescEvent, &doL1LongDescEvent, 74 &doL2LongDescEvent, &doL3LongDescEvent }, 75 doProcessEvent([this]{ processWalkWrapper(); }, name()) 76{ 77 sctlr = 0; 78 79 // Cache system-level properties 80 if (FullSystem) { 81 ArmSystem *armSys = dynamic_cast<ArmSystem *>(p->sys); 82 assert(armSys); 83 haveSecurity = armSys->haveSecurity(); 84 _haveLPAE = armSys->haveLPAE(); 85 _haveVirtualization = armSys->haveVirtualization(); 86 physAddrRange = armSys->physAddrRange(); 87 _haveLargeAsid64 = armSys->haveLargeAsid64(); 88 } else { 89 haveSecurity = _haveLPAE = _haveVirtualization = false; 90 _haveLargeAsid64 = false; 91 physAddrRange = 32; 92 } 93 94} 95 96TableWalker::~TableWalker() 97{ 98 ; 99} 100 101void 102TableWalker::setMMU(Stage2MMU *m, MasterID master_id) 103{ 104 stage2Mmu = m; 105 port = &m->getDMAPort(); 106 masterId = master_id; 107} 108 109void 110TableWalker::init() 111{ 112 fatal_if(!stage2Mmu, "Table walker must have a valid stage-2 MMU\n"); 113 fatal_if(!port, "Table walker must have a valid port\n"); 114 fatal_if(!tlb, "Table walker must have a valid TLB\n"); 115} 116 117Port & 118TableWalker::getPort(const std::string &if_name, PortID idx) 119{ 120 if (if_name == "port") { 121 if (!isStage2) { 122 return *port; 123 } else { 124 fatal("Cannot access table walker port through stage-two walker\n"); 125 } 126 } 127 return ClockedObject::getPort(if_name, idx); 128} 129 130TableWalker::WalkerState::WalkerState() : 131 tc(nullptr), aarch64(false), el(EL0), physAddrRange(0), req(nullptr), 132 asid(0), vmid(0), isHyp(false), transState(nullptr), 133 vaddr(0), vaddr_tainted(0), 134 sctlr(0), scr(0), cpsr(0), tcr(0), 135 htcr(0), hcr(0), vtcr(0), 136 isWrite(false), isFetch(false), isSecure(false), 137 secureLookup(false), rwTable(false), userTable(false), xnTable(false), 138 pxnTable(false), stage2Req(false), 139 stage2Tran(nullptr), timing(false), functional(false), 140 mode(BaseTLB::Read), tranType(TLB::NormalTran), l2Desc(l1Desc), 141 delayed(false), tableWalker(nullptr) 142{ 143} 144 145void 146TableWalker::completeDrain() 147{ 148 if (drainState() == DrainState::Draining && 149 stateQueues[L0].empty() && stateQueues[L1].empty() && 150 stateQueues[L2].empty() && stateQueues[L3].empty() && 151 pendingQueue.empty()) { 152 153 DPRINTF(Drain, "TableWalker done draining, processing drain event\n"); 154 signalDrainDone(); 155 } 156} 157 158DrainState 159TableWalker::drain() 160{ 161 bool state_queues_not_empty = false; 162 163 for (int i = 0; i < MAX_LOOKUP_LEVELS; ++i) { 164 if (!stateQueues[i].empty()) { 165 state_queues_not_empty = true; 166 break; 167 } 168 } 169 170 if (state_queues_not_empty || pendingQueue.size()) { 171 DPRINTF(Drain, "TableWalker not drained\n"); 172 return DrainState::Draining; 173 } else { 174 DPRINTF(Drain, "TableWalker free, no need to drain\n"); 175 return DrainState::Drained; 176 } 177} 178 179void 180TableWalker::drainResume() 181{ 182 if (params()->sys->isTimingMode() && currState) { 183 delete currState; 184 currState = NULL; 185 pendingChange(); 186 } 187} 188 189Fault 190TableWalker::walk(const RequestPtr &_req, ThreadContext *_tc, uint16_t _asid, 191 uint8_t _vmid, bool _isHyp, TLB::Mode _mode, 192 TLB::Translation *_trans, bool _timing, bool _functional, 193 bool secure, TLB::ArmTranslationType tranType, 194 bool _stage2Req) 195{ 196 assert(!(_functional && _timing)); 197 ++statWalks; 198 199 WalkerState *savedCurrState = NULL; 200 201 if (!currState && !_functional) { 202 // For atomic mode, a new WalkerState instance should be only created 203 // once per TLB. For timing mode, a new instance is generated for every 204 // TLB miss. 205 DPRINTF(TLBVerbose, "creating new instance of WalkerState\n"); 206 207 currState = new WalkerState(); 208 currState->tableWalker = this; 209 } else if (_functional) { 210 // If we are mixing functional mode with timing (or even 211 // atomic), we need to to be careful and clean up after 212 // ourselves to not risk getting into an inconsistent state. 213 DPRINTF(TLBVerbose, "creating functional instance of WalkerState\n"); 214 savedCurrState = currState; 215 currState = new WalkerState(); 216 currState->tableWalker = this; 217 } else if (_timing) { 218 // This is a translation that was completed and then faulted again 219 // because some underlying parameters that affect the translation 220 // changed out from under us (e.g. asid). It will either be a 221 // misprediction, in which case nothing will happen or we'll use 222 // this fault to re-execute the faulting instruction which should clean 223 // up everything. 224 if (currState->vaddr_tainted == _req->getVaddr()) { 225 ++statSquashedBefore; 226 return std::make_shared<ReExec>(); 227 } 228 } 229 pendingChange(); 230 231 currState->startTime = curTick(); 232 currState->tc = _tc; 233 // ARM DDI 0487A.f (ARMv8 ARM) pg J8-5672 234 // aarch32/translation/translation/AArch32.TranslateAddress dictates 235 // even AArch32 EL0 will use AArch64 translation if EL1 is in AArch64. 236 if (isStage2) { 237 currState->el = EL1; 238 currState->aarch64 = ELIs64(_tc, EL2); 239 } else { 240 currState->el = 241 TLB::tranTypeEL(_tc->readMiscReg(MISCREG_CPSR), tranType); 242 currState->aarch64 = 243 ELIs64(_tc, currState->el == EL0 ? EL1 : currState->el); 244 } 245 currState->transState = _trans; 246 currState->req = _req; 247 currState->fault = NoFault; 248 currState->asid = _asid; 249 currState->vmid = _vmid; 250 currState->isHyp = _isHyp; 251 currState->timing = _timing; 252 currState->functional = _functional; 253 currState->mode = _mode; 254 currState->tranType = tranType; 255 currState->isSecure = secure; 256 currState->physAddrRange = physAddrRange; 257 258 /** @todo These should be cached or grabbed from cached copies in 259 the TLB, all these miscreg reads are expensive */ 260 currState->vaddr_tainted = currState->req->getVaddr(); 261 if (currState->aarch64) 262 currState->vaddr = purifyTaggedAddr(currState->vaddr_tainted, 263 currState->tc, currState->el); 264 else 265 currState->vaddr = currState->vaddr_tainted; 266 267 if (currState->aarch64) { 268 if (isStage2) { 269 currState->sctlr = currState->tc->readMiscReg(MISCREG_SCTLR_EL1); 270 currState->vtcr = currState->tc->readMiscReg(MISCREG_VTCR_EL2); 271 } else switch (currState->el) { 272 case EL0: 273 case EL1: 274 currState->sctlr = currState->tc->readMiscReg(MISCREG_SCTLR_EL1); 275 currState->tcr = currState->tc->readMiscReg(MISCREG_TCR_EL1); 276 break; 277 case EL2: 278 assert(_haveVirtualization); 279 currState->sctlr = currState->tc->readMiscReg(MISCREG_SCTLR_EL2); 280 currState->tcr = currState->tc->readMiscReg(MISCREG_TCR_EL2); 281 break; 282 case EL3: 283 assert(haveSecurity); 284 currState->sctlr = currState->tc->readMiscReg(MISCREG_SCTLR_EL3); 285 currState->tcr = currState->tc->readMiscReg(MISCREG_TCR_EL3); 286 break; 287 default: 288 panic("Invalid exception level"); 289 break; 290 } 291 currState->hcr = currState->tc->readMiscReg(MISCREG_HCR_EL2); 292 } else { 293 currState->sctlr = currState->tc->readMiscReg(snsBankedIndex( 294 MISCREG_SCTLR, currState->tc, !currState->isSecure)); 295 currState->ttbcr = currState->tc->readMiscReg(snsBankedIndex( 296 MISCREG_TTBCR, currState->tc, !currState->isSecure)); 297 currState->htcr = currState->tc->readMiscReg(MISCREG_HTCR); 298 currState->hcr = currState->tc->readMiscReg(MISCREG_HCR); 299 currState->vtcr = currState->tc->readMiscReg(MISCREG_VTCR); 300 } 301 sctlr = currState->sctlr; 302 303 currState->isFetch = (currState->mode == TLB::Execute); 304 currState->isWrite = (currState->mode == TLB::Write); 305 306 statRequestOrigin[REQUESTED][currState->isFetch]++; 307 308 currState->stage2Req = _stage2Req && !isStage2; 309 310 bool long_desc_format = currState->aarch64 || _isHyp || isStage2 || 311 longDescFormatInUse(currState->tc); 312 313 if (long_desc_format) { 314 // Helper variables used for hierarchical permissions 315 currState->secureLookup = currState->isSecure; 316 currState->rwTable = true; 317 currState->userTable = true; 318 currState->xnTable = false; 319 currState->pxnTable = false; 320 321 ++statWalksLongDescriptor; 322 } else { 323 ++statWalksShortDescriptor; 324 } 325 326 if (!currState->timing) { 327 Fault fault = NoFault; 328 if (currState->aarch64) 329 fault = processWalkAArch64(); 330 else if (long_desc_format) 331 fault = processWalkLPAE(); 332 else 333 fault = processWalk(); 334 335 // If this was a functional non-timing access restore state to 336 // how we found it. 337 if (currState->functional) { 338 delete currState; 339 currState = savedCurrState; 340 } 341 return fault; 342 } 343 344 if (pending || pendingQueue.size()) { 345 pendingQueue.push_back(currState); 346 currState = NULL; 347 pendingChange(); 348 } else { 349 pending = true; 350 pendingChange(); 351 if (currState->aarch64) 352 return processWalkAArch64(); 353 else if (long_desc_format) 354 return processWalkLPAE(); 355 else 356 return processWalk(); 357 } 358 359 return NoFault; 360} 361 362void 363TableWalker::processWalkWrapper() 364{ 365 assert(!currState); 366 assert(pendingQueue.size()); 367 pendingChange(); 368 currState = pendingQueue.front(); 369 370 // Check if a previous walk filled this request already 371 // @TODO Should this always be the TLB or should we look in the stage2 TLB? 372 TlbEntry* te = tlb->lookup(currState->vaddr, currState->asid, 373 currState->vmid, currState->isHyp, currState->isSecure, true, false, 374 currState->el); 375 376 // Check if we still need to have a walk for this request. If the requesting 377 // instruction has been squashed, or a previous walk has filled the TLB with 378 // a match, we just want to get rid of the walk. The latter could happen 379 // when there are multiple outstanding misses to a single page and a 380 // previous request has been successfully translated. 381 if (!currState->transState->squashed() && !te) { 382 // We've got a valid request, lets process it 383 pending = true; 384 pendingQueue.pop_front(); 385 // Keep currState in case one of the processWalk... calls NULLs it 386 WalkerState *curr_state_copy = currState; 387 Fault f; 388 if (currState->aarch64) 389 f = processWalkAArch64(); 390 else if (longDescFormatInUse(currState->tc) || 391 currState->isHyp || isStage2) 392 f = processWalkLPAE(); 393 else 394 f = processWalk(); 395 396 if (f != NoFault) { 397 curr_state_copy->transState->finish(f, curr_state_copy->req, 398 curr_state_copy->tc, curr_state_copy->mode); 399 400 delete curr_state_copy; 401 } 402 return; 403 } 404 405 406 // If the instruction that we were translating for has been 407 // squashed we shouldn't bother. 408 unsigned num_squashed = 0; 409 ThreadContext *tc = currState->tc; 410 while ((num_squashed < numSquashable) && currState && 411 (currState->transState->squashed() || te)) { 412 pendingQueue.pop_front(); 413 num_squashed++; 414 statSquashedBefore++; 415 416 DPRINTF(TLB, "Squashing table walk for address %#x\n", 417 currState->vaddr_tainted); 418 419 if (currState->transState->squashed()) { 420 // finish the translation which will delete the translation object 421 currState->transState->finish( 422 std::make_shared<UnimpFault>("Squashed Inst"), 423 currState->req, currState->tc, currState->mode); 424 } else { 425 // translate the request now that we know it will work 426 statWalkServiceTime.sample(curTick() - currState->startTime); 427 tlb->translateTiming(currState->req, currState->tc, 428 currState->transState, currState->mode); 429 430 } 431 432 // delete the current request 433 delete currState; 434 435 // peak at the next one 436 if (pendingQueue.size()) { 437 currState = pendingQueue.front(); 438 te = tlb->lookup(currState->vaddr, currState->asid, 439 currState->vmid, currState->isHyp, currState->isSecure, true, 440 false, currState->el); 441 } else { 442 // Terminate the loop, nothing more to do 443 currState = NULL; 444 } 445 } 446 pendingChange(); 447 448 // if we still have pending translations, schedule more work 449 nextWalk(tc); 450 currState = NULL; 451} 452 453Fault 454TableWalker::processWalk() 455{ 456 Addr ttbr = 0; 457 458 // If translation isn't enabled, we shouldn't be here 459 assert(currState->sctlr.m || isStage2); 460 461 DPRINTF(TLB, "Beginning table walk for address %#x, TTBCR: %#x, bits:%#x\n", 462 currState->vaddr_tainted, currState->ttbcr, mbits(currState->vaddr, 31, 463 32 - currState->ttbcr.n)); 464 465 statWalkWaitTime.sample(curTick() - currState->startTime); 466 467 if (currState->ttbcr.n == 0 || !mbits(currState->vaddr, 31, 468 32 - currState->ttbcr.n)) { 469 DPRINTF(TLB, " - Selecting TTBR0\n"); 470 // Check if table walk is allowed when Security Extensions are enabled 471 if (haveSecurity && currState->ttbcr.pd0) { 472 if (currState->isFetch) 473 return std::make_shared<PrefetchAbort>( 474 currState->vaddr_tainted, 475 ArmFault::TranslationLL + L1, 476 isStage2, 477 ArmFault::VmsaTran); 478 else 479 return std::make_shared<DataAbort>( 480 currState->vaddr_tainted, 481 TlbEntry::DomainType::NoAccess, currState->isWrite, 482 ArmFault::TranslationLL + L1, isStage2, 483 ArmFault::VmsaTran); 484 } 485 ttbr = currState->tc->readMiscReg(snsBankedIndex( 486 MISCREG_TTBR0, currState->tc, !currState->isSecure)); 487 } else { 488 DPRINTF(TLB, " - Selecting TTBR1\n"); 489 // Check if table walk is allowed when Security Extensions are enabled 490 if (haveSecurity && currState->ttbcr.pd1) { 491 if (currState->isFetch) 492 return std::make_shared<PrefetchAbort>( 493 currState->vaddr_tainted, 494 ArmFault::TranslationLL + L1, 495 isStage2, 496 ArmFault::VmsaTran); 497 else 498 return std::make_shared<DataAbort>( 499 currState->vaddr_tainted, 500 TlbEntry::DomainType::NoAccess, currState->isWrite, 501 ArmFault::TranslationLL + L1, isStage2, 502 ArmFault::VmsaTran); 503 } 504 ttbr = currState->tc->readMiscReg(snsBankedIndex( 505 MISCREG_TTBR1, currState->tc, !currState->isSecure)); 506 currState->ttbcr.n = 0; 507 } 508 509 Addr l1desc_addr = mbits(ttbr, 31, 14 - currState->ttbcr.n) | 510 (bits(currState->vaddr, 31 - currState->ttbcr.n, 20) << 2); 511 DPRINTF(TLB, " - Descriptor at address %#x (%s)\n", l1desc_addr, 512 currState->isSecure ? "s" : "ns"); 513 514 // Trickbox address check 515 Fault f; 516 f = testWalk(l1desc_addr, sizeof(uint32_t), 517 TlbEntry::DomainType::NoAccess, L1); 518 if (f) { 519 DPRINTF(TLB, "Trickbox check caused fault on %#x\n", currState->vaddr_tainted); 520 if (currState->timing) { 521 pending = false; 522 nextWalk(currState->tc); 523 currState = NULL; 524 } else { 525 currState->tc = NULL; 526 currState->req = NULL; 527 } 528 return f; 529 } 530 531 Request::Flags flag = Request::PT_WALK; 532 if (currState->sctlr.c == 0) { 533 flag.set(Request::UNCACHEABLE); 534 } 535 536 if (currState->isSecure) { 537 flag.set(Request::SECURE); 538 } 539 540 bool delayed; 541 delayed = fetchDescriptor(l1desc_addr, (uint8_t*)&currState->l1Desc.data, 542 sizeof(uint32_t), flag, L1, &doL1DescEvent, 543 &TableWalker::doL1Descriptor); 544 if (!delayed) { 545 f = currState->fault; 546 } 547 548 return f; 549} 550 551Fault 552TableWalker::processWalkLPAE() 553{ 554 Addr ttbr, ttbr0_max, ttbr1_min, desc_addr; 555 int tsz, n; 556 LookupLevel start_lookup_level = L1; 557 558 DPRINTF(TLB, "Beginning table walk for address %#x, TTBCR: %#x\n", 559 currState->vaddr_tainted, currState->ttbcr); 560 561 statWalkWaitTime.sample(curTick() - currState->startTime); 562 563 Request::Flags flag = Request::PT_WALK; 564 if (currState->isSecure) 565 flag.set(Request::SECURE); 566 567 // work out which base address register to use, if in hyp mode we always 568 // use HTTBR 569 if (isStage2) { 570 DPRINTF(TLB, " - Selecting VTTBR (long-desc.)\n"); 571 ttbr = currState->tc->readMiscReg(MISCREG_VTTBR); 572 tsz = sext<4>(currState->vtcr.t0sz); 573 start_lookup_level = currState->vtcr.sl0 ? L1 : L2; 574 } else if (currState->isHyp) { 575 DPRINTF(TLB, " - Selecting HTTBR (long-desc.)\n"); 576 ttbr = currState->tc->readMiscReg(MISCREG_HTTBR); 577 tsz = currState->htcr.t0sz; 578 } else { 579 assert(longDescFormatInUse(currState->tc)); 580 581 // Determine boundaries of TTBR0/1 regions 582 if (currState->ttbcr.t0sz) 583 ttbr0_max = (1ULL << (32 - currState->ttbcr.t0sz)) - 1; 584 else if (currState->ttbcr.t1sz) 585 ttbr0_max = (1ULL << 32) - 586 (1ULL << (32 - currState->ttbcr.t1sz)) - 1; 587 else 588 ttbr0_max = (1ULL << 32) - 1; 589 if (currState->ttbcr.t1sz) 590 ttbr1_min = (1ULL << 32) - (1ULL << (32 - currState->ttbcr.t1sz)); 591 else 592 ttbr1_min = (1ULL << (32 - currState->ttbcr.t0sz)); 593 594 // The following code snippet selects the appropriate translation table base 595 // address (TTBR0 or TTBR1) and the appropriate starting lookup level 596 // depending on the address range supported by the translation table (ARM 597 // ARM issue C B3.6.4) 598 if (currState->vaddr <= ttbr0_max) { 599 DPRINTF(TLB, " - Selecting TTBR0 (long-desc.)\n"); 600 // Check if table walk is allowed 601 if (currState->ttbcr.epd0) { 602 if (currState->isFetch) 603 return std::make_shared<PrefetchAbort>( 604 currState->vaddr_tainted, 605 ArmFault::TranslationLL + L1, 606 isStage2, 607 ArmFault::LpaeTran); 608 else 609 return std::make_shared<DataAbort>( 610 currState->vaddr_tainted, 611 TlbEntry::DomainType::NoAccess, 612 currState->isWrite, 613 ArmFault::TranslationLL + L1, 614 isStage2, 615 ArmFault::LpaeTran); 616 } 617 ttbr = currState->tc->readMiscReg(snsBankedIndex( 618 MISCREG_TTBR0, currState->tc, !currState->isSecure)); 619 tsz = currState->ttbcr.t0sz; 620 if (ttbr0_max < (1ULL << 30)) // Upper limit < 1 GB 621 start_lookup_level = L2; 622 } else if (currState->vaddr >= ttbr1_min) { 623 DPRINTF(TLB, " - Selecting TTBR1 (long-desc.)\n"); 624 // Check if table walk is allowed 625 if (currState->ttbcr.epd1) { 626 if (currState->isFetch) 627 return std::make_shared<PrefetchAbort>( 628 currState->vaddr_tainted, 629 ArmFault::TranslationLL + L1, 630 isStage2, 631 ArmFault::LpaeTran); 632 else 633 return std::make_shared<DataAbort>( 634 currState->vaddr_tainted, 635 TlbEntry::DomainType::NoAccess, 636 currState->isWrite, 637 ArmFault::TranslationLL + L1, 638 isStage2, 639 ArmFault::LpaeTran); 640 } 641 ttbr = currState->tc->readMiscReg(snsBankedIndex( 642 MISCREG_TTBR1, currState->tc, !currState->isSecure)); 643 tsz = currState->ttbcr.t1sz; 644 if (ttbr1_min >= (1ULL << 31) + (1ULL << 30)) // Lower limit >= 3 GB 645 start_lookup_level = L2; 646 } else { 647 // Out of boundaries -> translation fault 648 if (currState->isFetch) 649 return std::make_shared<PrefetchAbort>( 650 currState->vaddr_tainted, 651 ArmFault::TranslationLL + L1, 652 isStage2, 653 ArmFault::LpaeTran); 654 else 655 return std::make_shared<DataAbort>( 656 currState->vaddr_tainted, 657 TlbEntry::DomainType::NoAccess, 658 currState->isWrite, ArmFault::TranslationLL + L1, 659 isStage2, ArmFault::LpaeTran); 660 } 661 662 } 663 664 // Perform lookup (ARM ARM issue C B3.6.6) 665 if (start_lookup_level == L1) { 666 n = 5 - tsz; 667 desc_addr = mbits(ttbr, 39, n) | 668 (bits(currState->vaddr, n + 26, 30) << 3); 669 DPRINTF(TLB, " - Descriptor at address %#x (%s) (long-desc.)\n", 670 desc_addr, currState->isSecure ? "s" : "ns"); 671 } else { 672 // Skip first-level lookup 673 n = (tsz >= 2 ? 14 - tsz : 12); 674 desc_addr = mbits(ttbr, 39, n) | 675 (bits(currState->vaddr, n + 17, 21) << 3); 676 DPRINTF(TLB, " - Descriptor at address %#x (%s) (long-desc.)\n", 677 desc_addr, currState->isSecure ? "s" : "ns"); 678 } 679 680 // Trickbox address check 681 Fault f = testWalk(desc_addr, sizeof(uint64_t), 682 TlbEntry::DomainType::NoAccess, start_lookup_level); 683 if (f) { 684 DPRINTF(TLB, "Trickbox check caused fault on %#x\n", currState->vaddr_tainted); 685 if (currState->timing) { 686 pending = false; 687 nextWalk(currState->tc); 688 currState = NULL; 689 } else { 690 currState->tc = NULL; 691 currState->req = NULL; 692 } 693 return f; 694 } 695 696 if (currState->sctlr.c == 0) { 697 flag.set(Request::UNCACHEABLE); 698 } 699 700 currState->longDesc.lookupLevel = start_lookup_level; 701 currState->longDesc.aarch64 = false; 702 currState->longDesc.grainSize = Grain4KB; 703 704 bool delayed = fetchDescriptor(desc_addr, (uint8_t*)&currState->longDesc.data, 705 sizeof(uint64_t), flag, start_lookup_level, 706 LongDescEventByLevel[start_lookup_level], 707 &TableWalker::doLongDescriptor); 708 if (!delayed) { 709 f = currState->fault; 710 } 711 712 return f; 713} 714 715unsigned 716TableWalker::adjustTableSizeAArch64(unsigned tsz) 717{ 718 if (tsz < 25) 719 return 25; 720 if (tsz > 48) 721 return 48; 722 return tsz; 723} 724 725bool 726TableWalker::checkAddrSizeFaultAArch64(Addr addr, int currPhysAddrRange) 727{ 728 return (currPhysAddrRange != MaxPhysAddrRange && 729 bits(addr, MaxPhysAddrRange - 1, currPhysAddrRange)); 730} 731 732Fault 733TableWalker::processWalkAArch64() 734{ 735 assert(currState->aarch64); 736 737 DPRINTF(TLB, "Beginning table walk for address %#llx, TCR: %#llx\n", 738 currState->vaddr_tainted, currState->tcr); 739 740 static const GrainSize GrainMap_tg0[] = 741 { Grain4KB, Grain64KB, Grain16KB, ReservedGrain }; 742 static const GrainSize GrainMap_tg1[] = 743 { ReservedGrain, Grain16KB, Grain4KB, Grain64KB }; 744 745 statWalkWaitTime.sample(curTick() - currState->startTime); 746 747 // Determine TTBR, table size, granule size and phys. address range 748 Addr ttbr = 0; 749 int tsz = 0, ps = 0; 750 GrainSize tg = Grain4KB; // grain size computed from tg* field 751 bool fault = false; 752 753 LookupLevel start_lookup_level = MAX_LOOKUP_LEVELS; 754 755 switch (currState->el) { 756 case EL0: 757 case EL1: 758 if (isStage2) { 759 DPRINTF(TLB, " - Selecting VTTBR0 (AArch64 stage 2)\n"); 760 ttbr = currState->tc->readMiscReg(MISCREG_VTTBR_EL2); 761 tsz = 64 - currState->vtcr.t0sz64; 762 tg = GrainMap_tg0[currState->vtcr.tg0]; 763 // ARM DDI 0487A.f D7-2148 764 // The starting level of stage 2 translation depends on 765 // VTCR_EL2.SL0 and VTCR_EL2.TG0 766 LookupLevel __ = MAX_LOOKUP_LEVELS; // invalid level 767 uint8_t sl_tg = (currState->vtcr.sl0 << 2) | currState->vtcr.tg0; 768 static const LookupLevel SLL[] = { 769 L2, L3, L3, __, // sl0 == 0 770 L1, L2, L2, __, // sl0 == 1, etc. 771 L0, L1, L1, __, 772 __, __, __, __ 773 }; 774 start_lookup_level = SLL[sl_tg]; 775 panic_if(start_lookup_level == MAX_LOOKUP_LEVELS, 776 "Cannot discern lookup level from vtcr.{sl0,tg0}"); 777 ps = currState->vtcr.ps; 778 } else { 779 switch (bits(currState->vaddr, 63,48)) { 780 case 0: 781 DPRINTF(TLB, " - Selecting TTBR0 (AArch64)\n"); 782 ttbr = currState->tc->readMiscReg(MISCREG_TTBR0_EL1); 783 tsz = adjustTableSizeAArch64(64 - currState->tcr.t0sz); 784 tg = GrainMap_tg0[currState->tcr.tg0]; 785 if (bits(currState->vaddr, 63, tsz) != 0x0 || 786 currState->tcr.epd0) 787 fault = true; 788 break; 789 case 0xffff: 790 DPRINTF(TLB, " - Selecting TTBR1 (AArch64)\n"); 791 ttbr = currState->tc->readMiscReg(MISCREG_TTBR1_EL1); 792 tsz = adjustTableSizeAArch64(64 - currState->tcr.t1sz); 793 tg = GrainMap_tg1[currState->tcr.tg1]; 794 if (bits(currState->vaddr, 63, tsz) != mask(64-tsz) || 795 currState->tcr.epd1) 796 fault = true; 797 break; 798 default: 799 // top two bytes must be all 0s or all 1s, else invalid addr 800 fault = true; 801 } 802 ps = currState->tcr.ips; 803 } 804 break; 805 case EL2: 806 switch(bits(currState->vaddr, 63,48)) { 807 case 0: 808 DPRINTF(TLB, " - Selecting TTBR0 (AArch64)\n"); 809 ttbr = currState->tc->readMiscReg(MISCREG_TTBR0_EL2); 810 tsz = adjustTableSizeAArch64(64 - currState->tcr.t0sz); 811 tg = GrainMap_tg0[currState->tcr.tg0]; 812 break; 813 814 case 0xffff: 815 DPRINTF(TLB, " - Selecting TTBR1 (AArch64)\n"); 816 ttbr = currState->tc->readMiscReg(MISCREG_TTBR1_EL2); 817 tsz = adjustTableSizeAArch64(64 - currState->tcr.t1sz); 818 tg = GrainMap_tg1[currState->tcr.tg1]; 819 if (bits(currState->vaddr, 63, tsz) != mask(64-tsz) || 820 currState->tcr.epd1 || !currState->hcr.e2h) 821 fault = true; 822 break; 823 824 default: 825 // invalid addr if top two bytes are not all 0s 826 fault = true; 827 } 828 ps = currState->tcr.ps; 829 break; 830 case EL3: 831 switch(bits(currState->vaddr, 63,48)) { 832 case 0: 833 DPRINTF(TLB, " - Selecting TTBR0 (AArch64)\n"); 834 ttbr = currState->tc->readMiscReg(MISCREG_TTBR0_EL3); 835 tsz = adjustTableSizeAArch64(64 - currState->tcr.t0sz); 836 tg = GrainMap_tg0[currState->tcr.tg0]; 837 break; 838 default: 839 // invalid addr if top two bytes are not all 0s 840 fault = true; 841 } 842 ps = currState->tcr.ps; 843 break; 844 } 845 846 if (fault) { 847 Fault f; 848 if (currState->isFetch) 849 f = std::make_shared<PrefetchAbort>( 850 currState->vaddr_tainted, 851 ArmFault::TranslationLL + L0, isStage2, 852 ArmFault::LpaeTran); 853 else 854 f = std::make_shared<DataAbort>( 855 currState->vaddr_tainted, 856 TlbEntry::DomainType::NoAccess, 857 currState->isWrite, 858 ArmFault::TranslationLL + L0, 859 isStage2, ArmFault::LpaeTran); 860 861 if (currState->timing) { 862 pending = false; 863 nextWalk(currState->tc); 864 currState = NULL; 865 } else { 866 currState->tc = NULL; 867 currState->req = NULL; 868 } 869 return f; 870 871 } 872 873 if (tg == ReservedGrain) { 874 warn_once("Reserved granule size requested; gem5's IMPLEMENTATION " 875 "DEFINED behavior takes this to mean 4KB granules\n"); 876 tg = Grain4KB; 877 } 878 879 // Determine starting lookup level 880 // See aarch64/translation/walk in Appendix G: ARMv8 Pseudocode Library 881 // in ARM DDI 0487A. These table values correspond to the cascading tests 882 // to compute the lookup level and are of the form 883 // (grain_size + N*stride), for N = {1, 2, 3}. 884 // A value of 64 will never succeed and a value of 0 will always succeed. 885 if (start_lookup_level == MAX_LOOKUP_LEVELS) { 886 struct GrainMap { 887 GrainSize grain_size; 888 unsigned lookup_level_cutoff[MAX_LOOKUP_LEVELS]; 889 }; 890 static const GrainMap GM[] = { 891 { Grain4KB, { 39, 30, 0, 0 } }, 892 { Grain16KB, { 47, 36, 25, 0 } }, 893 { Grain64KB, { 64, 42, 29, 0 } } 894 }; 895 896 const unsigned *lookup = NULL; // points to a lookup_level_cutoff 897 898 for (unsigned i = 0; i < 3; ++i) { // choose entry of GM[] 899 if (tg == GM[i].grain_size) { 900 lookup = GM[i].lookup_level_cutoff; 901 break; 902 } 903 } 904 assert(lookup); 905 906 for (int L = L0; L != MAX_LOOKUP_LEVELS; ++L) { 907 if (tsz > lookup[L]) { 908 start_lookup_level = (LookupLevel) L; 909 break; 910 } 911 } 912 panic_if(start_lookup_level == MAX_LOOKUP_LEVELS, 913 "Table walker couldn't find lookup level\n"); 914 } 915 916 int stride = tg - 3; 917 918 // Determine table base address 919 int base_addr_lo = 3 + tsz - stride * (3 - start_lookup_level) - tg; 920 Addr base_addr = mbits(ttbr, 47, base_addr_lo); 921 922 // Determine physical address size and raise an Address Size Fault if 923 // necessary 924 int pa_range = decodePhysAddrRange64(ps); 925 // Clamp to lower limit 926 if (pa_range > physAddrRange) 927 currState->physAddrRange = physAddrRange; 928 else 929 currState->physAddrRange = pa_range; 930 if (checkAddrSizeFaultAArch64(base_addr, currState->physAddrRange)) { 931 DPRINTF(TLB, "Address size fault before any lookup\n"); 932 Fault f; 933 if (currState->isFetch) 934 f = std::make_shared<PrefetchAbort>( 935 currState->vaddr_tainted, 936 ArmFault::AddressSizeLL + start_lookup_level, 937 isStage2, 938 ArmFault::LpaeTran); 939 else 940 f = std::make_shared<DataAbort>( 941 currState->vaddr_tainted, 942 TlbEntry::DomainType::NoAccess, 943 currState->isWrite, 944 ArmFault::AddressSizeLL + start_lookup_level, 945 isStage2, 946 ArmFault::LpaeTran); 947 948 949 if (currState->timing) { 950 pending = false; 951 nextWalk(currState->tc); 952 currState = NULL; 953 } else { 954 currState->tc = NULL; 955 currState->req = NULL; 956 } 957 return f; 958 959 } 960 961 // Determine descriptor address 962 Addr desc_addr = base_addr | 963 (bits(currState->vaddr, tsz - 1, 964 stride * (3 - start_lookup_level) + tg) << 3); 965 966 // Trickbox address check 967 Fault f = testWalk(desc_addr, sizeof(uint64_t), 968 TlbEntry::DomainType::NoAccess, start_lookup_level); 969 if (f) { 970 DPRINTF(TLB, "Trickbox check caused fault on %#x\n", currState->vaddr_tainted); 971 if (currState->timing) { 972 pending = false; 973 nextWalk(currState->tc); 974 currState = NULL; 975 } else { 976 currState->tc = NULL; 977 currState->req = NULL; 978 } 979 return f; 980 } 981 982 Request::Flags flag = Request::PT_WALK; 983 if (currState->sctlr.c == 0) { 984 flag.set(Request::UNCACHEABLE); 985 } 986 987 if (currState->isSecure) { 988 flag.set(Request::SECURE); 989 } 990 991 currState->longDesc.lookupLevel = start_lookup_level; 992 currState->longDesc.aarch64 = true; 993 currState->longDesc.grainSize = tg; 994 995 if (currState->timing) { 996 fetchDescriptor(desc_addr, (uint8_t*) &currState->longDesc.data, 997 sizeof(uint64_t), flag, start_lookup_level, 998 LongDescEventByLevel[start_lookup_level], NULL); 999 } else { 1000 fetchDescriptor(desc_addr, (uint8_t*)&currState->longDesc.data, 1001 sizeof(uint64_t), flag, -1, NULL, 1002 &TableWalker::doLongDescriptor); 1003 f = currState->fault; 1004 } 1005 1006 return f; 1007} 1008 1009void 1010TableWalker::memAttrs(ThreadContext *tc, TlbEntry &te, SCTLR sctlr, 1011 uint8_t texcb, bool s) 1012{ 1013 // Note: tc and sctlr local variables are hiding tc and sctrl class 1014 // variables 1015 DPRINTF(TLBVerbose, "memAttrs texcb:%d s:%d\n", texcb, s); 1016 te.shareable = false; // default value 1017 te.nonCacheable = false; 1018 te.outerShareable = false; 1019 if (sctlr.tre == 0 || ((sctlr.tre == 1) && (sctlr.m == 0))) { 1020 switch(texcb) { 1021 case 0: // Stongly-ordered 1022 te.nonCacheable = true; 1023 te.mtype = TlbEntry::MemoryType::StronglyOrdered; 1024 te.shareable = true; 1025 te.innerAttrs = 1; 1026 te.outerAttrs = 0; 1027 break; 1028 case 1: // Shareable Device 1029 te.nonCacheable = true; 1030 te.mtype = TlbEntry::MemoryType::Device; 1031 te.shareable = true; 1032 te.innerAttrs = 3; 1033 te.outerAttrs = 0; 1034 break; 1035 case 2: // Outer and Inner Write-Through, no Write-Allocate 1036 te.mtype = TlbEntry::MemoryType::Normal; 1037 te.shareable = s; 1038 te.innerAttrs = 6; 1039 te.outerAttrs = bits(texcb, 1, 0); 1040 break; 1041 case 3: // Outer and Inner Write-Back, no Write-Allocate 1042 te.mtype = TlbEntry::MemoryType::Normal; 1043 te.shareable = s; 1044 te.innerAttrs = 7; 1045 te.outerAttrs = bits(texcb, 1, 0); 1046 break; 1047 case 4: // Outer and Inner Non-cacheable 1048 te.nonCacheable = true; 1049 te.mtype = TlbEntry::MemoryType::Normal; 1050 te.shareable = s; 1051 te.innerAttrs = 0; 1052 te.outerAttrs = bits(texcb, 1, 0); 1053 break; 1054 case 5: // Reserved 1055 panic("Reserved texcb value!\n"); 1056 break; 1057 case 6: // Implementation Defined 1058 panic("Implementation-defined texcb value!\n"); 1059 break; 1060 case 7: // Outer and Inner Write-Back, Write-Allocate 1061 te.mtype = TlbEntry::MemoryType::Normal; 1062 te.shareable = s; 1063 te.innerAttrs = 5; 1064 te.outerAttrs = 1; 1065 break; 1066 case 8: // Non-shareable Device 1067 te.nonCacheable = true; 1068 te.mtype = TlbEntry::MemoryType::Device; 1069 te.shareable = false; 1070 te.innerAttrs = 3; 1071 te.outerAttrs = 0; 1072 break; 1073 case 9 ... 15: // Reserved 1074 panic("Reserved texcb value!\n"); 1075 break; 1076 case 16 ... 31: // Cacheable Memory 1077 te.mtype = TlbEntry::MemoryType::Normal; 1078 te.shareable = s; 1079 if (bits(texcb, 1,0) == 0 || bits(texcb, 3,2) == 0) 1080 te.nonCacheable = true; 1081 te.innerAttrs = bits(texcb, 1, 0); 1082 te.outerAttrs = bits(texcb, 3, 2); 1083 break; 1084 default: 1085 panic("More than 32 states for 5 bits?\n"); 1086 } 1087 } else { 1088 assert(tc); 1089 PRRR prrr = tc->readMiscReg(snsBankedIndex(MISCREG_PRRR, 1090 currState->tc, !currState->isSecure)); 1091 NMRR nmrr = tc->readMiscReg(snsBankedIndex(MISCREG_NMRR, 1092 currState->tc, !currState->isSecure)); 1093 DPRINTF(TLBVerbose, "memAttrs PRRR:%08x NMRR:%08x\n", prrr, nmrr); 1094 uint8_t curr_tr = 0, curr_ir = 0, curr_or = 0; 1095 switch(bits(texcb, 2,0)) { 1096 case 0: 1097 curr_tr = prrr.tr0; 1098 curr_ir = nmrr.ir0; 1099 curr_or = nmrr.or0; 1100 te.outerShareable = (prrr.nos0 == 0); 1101 break; 1102 case 1: 1103 curr_tr = prrr.tr1; 1104 curr_ir = nmrr.ir1; 1105 curr_or = nmrr.or1; 1106 te.outerShareable = (prrr.nos1 == 0); 1107 break; 1108 case 2: 1109 curr_tr = prrr.tr2; 1110 curr_ir = nmrr.ir2; 1111 curr_or = nmrr.or2; 1112 te.outerShareable = (prrr.nos2 == 0); 1113 break; 1114 case 3: 1115 curr_tr = prrr.tr3; 1116 curr_ir = nmrr.ir3; 1117 curr_or = nmrr.or3; 1118 te.outerShareable = (prrr.nos3 == 0); 1119 break; 1120 case 4: 1121 curr_tr = prrr.tr4; 1122 curr_ir = nmrr.ir4; 1123 curr_or = nmrr.or4; 1124 te.outerShareable = (prrr.nos4 == 0); 1125 break; 1126 case 5: 1127 curr_tr = prrr.tr5; 1128 curr_ir = nmrr.ir5; 1129 curr_or = nmrr.or5; 1130 te.outerShareable = (prrr.nos5 == 0); 1131 break; 1132 case 6: 1133 panic("Imp defined type\n"); 1134 case 7: 1135 curr_tr = prrr.tr7; 1136 curr_ir = nmrr.ir7; 1137 curr_or = nmrr.or7; 1138 te.outerShareable = (prrr.nos7 == 0); 1139 break; 1140 } 1141 1142 switch(curr_tr) { 1143 case 0: 1144 DPRINTF(TLBVerbose, "StronglyOrdered\n"); 1145 te.mtype = TlbEntry::MemoryType::StronglyOrdered; 1146 te.nonCacheable = true; 1147 te.innerAttrs = 1; 1148 te.outerAttrs = 0; 1149 te.shareable = true; 1150 break; 1151 case 1: 1152 DPRINTF(TLBVerbose, "Device ds1:%d ds0:%d s:%d\n", 1153 prrr.ds1, prrr.ds0, s); 1154 te.mtype = TlbEntry::MemoryType::Device; 1155 te.nonCacheable = true; 1156 te.innerAttrs = 3; 1157 te.outerAttrs = 0; 1158 if (prrr.ds1 && s) 1159 te.shareable = true; 1160 if (prrr.ds0 && !s) 1161 te.shareable = true; 1162 break; 1163 case 2: 1164 DPRINTF(TLBVerbose, "Normal ns1:%d ns0:%d s:%d\n", 1165 prrr.ns1, prrr.ns0, s); 1166 te.mtype = TlbEntry::MemoryType::Normal; 1167 if (prrr.ns1 && s) 1168 te.shareable = true; 1169 if (prrr.ns0 && !s) 1170 te.shareable = true; 1171 break; 1172 case 3: 1173 panic("Reserved type"); 1174 } 1175 1176 if (te.mtype == TlbEntry::MemoryType::Normal){ 1177 switch(curr_ir) { 1178 case 0: 1179 te.nonCacheable = true; 1180 te.innerAttrs = 0; 1181 break; 1182 case 1: 1183 te.innerAttrs = 5; 1184 break; 1185 case 2: 1186 te.innerAttrs = 6; 1187 break; 1188 case 3: 1189 te.innerAttrs = 7; 1190 break; 1191 } 1192 1193 switch(curr_or) { 1194 case 0: 1195 te.nonCacheable = true; 1196 te.outerAttrs = 0; 1197 break; 1198 case 1: 1199 te.outerAttrs = 1; 1200 break; 1201 case 2: 1202 te.outerAttrs = 2; 1203 break; 1204 case 3: 1205 te.outerAttrs = 3; 1206 break; 1207 } 1208 } 1209 } 1210 DPRINTF(TLBVerbose, "memAttrs: shareable: %d, innerAttrs: %d, " 1211 "outerAttrs: %d\n", 1212 te.shareable, te.innerAttrs, te.outerAttrs); 1213 te.setAttributes(false); 1214} 1215 1216void 1217TableWalker::memAttrsLPAE(ThreadContext *tc, TlbEntry &te, 1218 LongDescriptor &lDescriptor) 1219{ 1220 assert(_haveLPAE); 1221 1222 uint8_t attr; 1223 uint8_t sh = lDescriptor.sh(); 1224 // Different format and source of attributes if this is a stage 2 1225 // translation 1226 if (isStage2) { 1227 attr = lDescriptor.memAttr(); 1228 uint8_t attr_3_2 = (attr >> 2) & 0x3; 1229 uint8_t attr_1_0 = attr & 0x3; 1230 1231 DPRINTF(TLBVerbose, "memAttrsLPAE MemAttr:%#x sh:%#x\n", attr, sh); 1232 1233 if (attr_3_2 == 0) { 1234 te.mtype = attr_1_0 == 0 ? TlbEntry::MemoryType::StronglyOrdered 1235 : TlbEntry::MemoryType::Device; 1236 te.outerAttrs = 0; 1237 te.innerAttrs = attr_1_0 == 0 ? 1 : 3; 1238 te.nonCacheable = true; 1239 } else { 1240 te.mtype = TlbEntry::MemoryType::Normal; 1241 te.outerAttrs = attr_3_2 == 1 ? 0 : 1242 attr_3_2 == 2 ? 2 : 1; 1243 te.innerAttrs = attr_1_0 == 1 ? 0 : 1244 attr_1_0 == 2 ? 6 : 5; 1245 te.nonCacheable = (attr_3_2 == 1) || (attr_1_0 == 1); 1246 } 1247 } else { 1248 uint8_t attrIndx = lDescriptor.attrIndx(); 1249 1250 // LPAE always uses remapping of memory attributes, irrespective of the 1251 // value of SCTLR.TRE 1252 MiscRegIndex reg = attrIndx & 0x4 ? MISCREG_MAIR1 : MISCREG_MAIR0; 1253 int reg_as_int = snsBankedIndex(reg, currState->tc, 1254 !currState->isSecure); 1255 uint32_t mair = currState->tc->readMiscReg(reg_as_int); 1256 attr = (mair >> (8 * (attrIndx % 4))) & 0xff; 1257 uint8_t attr_7_4 = bits(attr, 7, 4); 1258 uint8_t attr_3_0 = bits(attr, 3, 0); 1259 DPRINTF(TLBVerbose, "memAttrsLPAE AttrIndx:%#x sh:%#x, attr %#x\n", attrIndx, sh, attr); 1260 1261 // Note: the memory subsystem only cares about the 'cacheable' memory 1262 // attribute. The other attributes are only used to fill the PAR register 1263 // accordingly to provide the illusion of full support 1264 te.nonCacheable = false; 1265 1266 switch (attr_7_4) { 1267 case 0x0: 1268 // Strongly-ordered or Device memory 1269 if (attr_3_0 == 0x0) 1270 te.mtype = TlbEntry::MemoryType::StronglyOrdered; 1271 else if (attr_3_0 == 0x4) 1272 te.mtype = TlbEntry::MemoryType::Device; 1273 else 1274 panic("Unpredictable behavior\n"); 1275 te.nonCacheable = true; 1276 te.outerAttrs = 0; 1277 break; 1278 case 0x4: 1279 // Normal memory, Outer Non-cacheable 1280 te.mtype = TlbEntry::MemoryType::Normal; 1281 te.outerAttrs = 0; 1282 if (attr_3_0 == 0x4) 1283 // Inner Non-cacheable 1284 te.nonCacheable = true; 1285 else if (attr_3_0 < 0x8) 1286 panic("Unpredictable behavior\n"); 1287 break; 1288 case 0x8: 1289 case 0x9: 1290 case 0xa: 1291 case 0xb: 1292 case 0xc: 1293 case 0xd: 1294 case 0xe: 1295 case 0xf: 1296 if (attr_7_4 & 0x4) { 1297 te.outerAttrs = (attr_7_4 & 1) ? 1 : 3; 1298 } else { 1299 te.outerAttrs = 0x2; 1300 } 1301 // Normal memory, Outer Cacheable 1302 te.mtype = TlbEntry::MemoryType::Normal; 1303 if (attr_3_0 != 0x4 && attr_3_0 < 0x8) 1304 panic("Unpredictable behavior\n"); 1305 break; 1306 default: 1307 panic("Unpredictable behavior\n"); 1308 break; 1309 } 1310 1311 switch (attr_3_0) { 1312 case 0x0: 1313 te.innerAttrs = 0x1; 1314 break; 1315 case 0x4: 1316 te.innerAttrs = attr_7_4 == 0 ? 0x3 : 0; 1317 break; 1318 case 0x8: 1319 case 0x9: 1320 case 0xA: 1321 case 0xB: 1322 te.innerAttrs = 6; 1323 break; 1324 case 0xC: 1325 case 0xD: 1326 case 0xE: 1327 case 0xF: 1328 te.innerAttrs = attr_3_0 & 1 ? 0x5 : 0x7; 1329 break; 1330 default: 1331 panic("Unpredictable behavior\n"); 1332 break; 1333 } 1334 } 1335 1336 te.outerShareable = sh == 2; 1337 te.shareable = (sh & 0x2) ? true : false; 1338 te.setAttributes(true); 1339 te.attributes |= (uint64_t) attr << 56; 1340} 1341 1342void 1343TableWalker::memAttrsAArch64(ThreadContext *tc, TlbEntry &te, 1344 LongDescriptor &lDescriptor) 1345{ 1346 uint8_t attr; 1347 uint8_t attr_hi; 1348 uint8_t attr_lo; 1349 uint8_t sh = lDescriptor.sh(); 1350 1351 if (isStage2) { 1352 attr = lDescriptor.memAttr(); 1353 uint8_t attr_hi = (attr >> 2) & 0x3; 1354 uint8_t attr_lo = attr & 0x3; 1355 1356 DPRINTF(TLBVerbose, "memAttrsAArch64 MemAttr:%#x sh:%#x\n", attr, sh); 1357 1358 if (attr_hi == 0) { 1359 te.mtype = attr_lo == 0 ? TlbEntry::MemoryType::StronglyOrdered 1360 : TlbEntry::MemoryType::Device; 1361 te.outerAttrs = 0; 1362 te.innerAttrs = attr_lo == 0 ? 1 : 3; 1363 te.nonCacheable = true; 1364 } else { 1365 te.mtype = TlbEntry::MemoryType::Normal; 1366 te.outerAttrs = attr_hi == 1 ? 0 : 1367 attr_hi == 2 ? 2 : 1; 1368 te.innerAttrs = attr_lo == 1 ? 0 : 1369 attr_lo == 2 ? 6 : 5; 1370 // Treat write-through memory as uncacheable, this is safe 1371 // but for performance reasons not optimal. 1372 te.nonCacheable = (attr_hi == 1) || (attr_hi == 2) || 1373 (attr_lo == 1) || (attr_lo == 2); 1374 } 1375 } else { 1376 uint8_t attrIndx = lDescriptor.attrIndx(); 1377 1378 DPRINTF(TLBVerbose, "memAttrsAArch64 AttrIndx:%#x sh:%#x\n", attrIndx, sh); 1379 1380 // Select MAIR 1381 uint64_t mair; 1382 switch (currState->el) { 1383 case EL0: 1384 case EL1: 1385 mair = tc->readMiscReg(MISCREG_MAIR_EL1); 1386 break; 1387 case EL2: 1388 mair = tc->readMiscReg(MISCREG_MAIR_EL2); 1389 break; 1390 case EL3: 1391 mair = tc->readMiscReg(MISCREG_MAIR_EL3); 1392 break; 1393 default: 1394 panic("Invalid exception level"); 1395 break; 1396 } 1397 1398 // Select attributes 1399 attr = bits(mair, 8 * attrIndx + 7, 8 * attrIndx); 1400 attr_lo = bits(attr, 3, 0); 1401 attr_hi = bits(attr, 7, 4); 1402 1403 // Memory type 1404 te.mtype = attr_hi == 0 ? TlbEntry::MemoryType::Device : TlbEntry::MemoryType::Normal; 1405 1406 // Cacheability 1407 te.nonCacheable = false; 1408 if (te.mtype == TlbEntry::MemoryType::Device) { // Device memory 1409 te.nonCacheable = true; 1410 } 1411 // Treat write-through memory as uncacheable, this is safe 1412 // but for performance reasons not optimal. 1413 switch (attr_hi) { 1414 case 0x1 ... 0x3: // Normal Memory, Outer Write-through transient 1415 case 0x4: // Normal memory, Outer Non-cacheable 1416 case 0x8 ... 0xb: // Normal Memory, Outer Write-through non-transient 1417 te.nonCacheable = true; 1418 } 1419 switch (attr_lo) { 1420 case 0x1 ... 0x3: // Normal Memory, Inner Write-through transient 1421 case 0x9 ... 0xb: // Normal Memory, Inner Write-through non-transient 1422 warn_if(!attr_hi, "Unpredictable behavior"); 1423 M5_FALLTHROUGH; 1424 case 0x4: // Device-nGnRE memory or 1425 // Normal memory, Inner Non-cacheable 1426 case 0x8: // Device-nGRE memory or 1427 // Normal memory, Inner Write-through non-transient 1428 te.nonCacheable = true; 1429 } 1430 1431 te.shareable = sh == 2; 1432 te.outerShareable = (sh & 0x2) ? true : false; 1433 // Attributes formatted according to the 64-bit PAR 1434 te.attributes = ((uint64_t) attr << 56) | 1435 (1 << 11) | // LPAE bit 1436 (te.ns << 9) | // NS bit 1437 (sh << 7); 1438 } 1439} 1440 1441void 1442TableWalker::doL1Descriptor() 1443{ 1444 if (currState->fault != NoFault) { 1445 return; 1446 } 1447 1448 currState->l1Desc.data = htog(currState->l1Desc.data, 1449 byteOrder(currState->tc)); 1450 1451 DPRINTF(TLB, "L1 descriptor for %#x is %#x\n", 1452 currState->vaddr_tainted, currState->l1Desc.data); 1453 TlbEntry te; 1454 1455 switch (currState->l1Desc.type()) { 1456 case L1Descriptor::Ignore: 1457 case L1Descriptor::Reserved: 1458 if (!currState->timing) { 1459 currState->tc = NULL; 1460 currState->req = NULL; 1461 } 1462 DPRINTF(TLB, "L1 Descriptor Reserved/Ignore, causing fault\n"); 1463 if (currState->isFetch) 1464 currState->fault = 1465 std::make_shared<PrefetchAbort>( 1466 currState->vaddr_tainted, 1467 ArmFault::TranslationLL + L1, 1468 isStage2, 1469 ArmFault::VmsaTran); 1470 else 1471 currState->fault = 1472 std::make_shared<DataAbort>( 1473 currState->vaddr_tainted, 1474 TlbEntry::DomainType::NoAccess, 1475 currState->isWrite, 1476 ArmFault::TranslationLL + L1, isStage2, 1477 ArmFault::VmsaTran); 1478 return; 1479 case L1Descriptor::Section: 1480 if (currState->sctlr.afe && bits(currState->l1Desc.ap(), 0) == 0) { 1481 /** @todo: check sctlr.ha (bit[17]) if Hardware Access Flag is 1482 * enabled if set, do l1.Desc.setAp0() instead of generating 1483 * AccessFlag0 1484 */ 1485 1486 currState->fault = std::make_shared<DataAbort>( 1487 currState->vaddr_tainted, 1488 currState->l1Desc.domain(), 1489 currState->isWrite, 1490 ArmFault::AccessFlagLL + L1, 1491 isStage2, 1492 ArmFault::VmsaTran); 1493 } 1494 if (currState->l1Desc.supersection()) { 1495 panic("Haven't implemented supersections\n"); 1496 } 1497 insertTableEntry(currState->l1Desc, false); 1498 return; 1499 case L1Descriptor::PageTable: 1500 { 1501 Addr l2desc_addr; 1502 l2desc_addr = currState->l1Desc.l2Addr() | 1503 (bits(currState->vaddr, 19, 12) << 2); 1504 DPRINTF(TLB, "L1 descriptor points to page table at: %#x (%s)\n", 1505 l2desc_addr, currState->isSecure ? "s" : "ns"); 1506 1507 // Trickbox address check 1508 currState->fault = testWalk(l2desc_addr, sizeof(uint32_t), 1509 currState->l1Desc.domain(), L2); 1510 1511 if (currState->fault) { 1512 if (!currState->timing) { 1513 currState->tc = NULL; 1514 currState->req = NULL; 1515 } 1516 return; 1517 } 1518 1519 Request::Flags flag = Request::PT_WALK; 1520 if (currState->isSecure) 1521 flag.set(Request::SECURE); 1522 1523 bool delayed; 1524 delayed = fetchDescriptor(l2desc_addr, 1525 (uint8_t*)&currState->l2Desc.data, 1526 sizeof(uint32_t), flag, -1, &doL2DescEvent, 1527 &TableWalker::doL2Descriptor); 1528 if (delayed) { 1529 currState->delayed = true; 1530 } 1531 1532 return; 1533 } 1534 default: 1535 panic("A new type in a 2 bit field?\n"); 1536 } 1537} 1538 1539void 1540TableWalker::doLongDescriptor() 1541{ 1542 if (currState->fault != NoFault) { 1543 return; 1544 } 1545 1546 currState->longDesc.data = htog(currState->longDesc.data, 1547 byteOrder(currState->tc)); 1548 1549 DPRINTF(TLB, "L%d descriptor for %#llx is %#llx (%s)\n", 1550 currState->longDesc.lookupLevel, currState->vaddr_tainted, 1551 currState->longDesc.data, 1552 currState->aarch64 ? "AArch64" : "long-desc."); 1553 1554 if ((currState->longDesc.type() == LongDescriptor::Block) || 1555 (currState->longDesc.type() == LongDescriptor::Page)) { 1556 DPRINTF(TLBVerbose, "Analyzing L%d descriptor: %#llx, pxn: %d, " 1557 "xn: %d, ap: %d, af: %d, type: %d\n", 1558 currState->longDesc.lookupLevel, 1559 currState->longDesc.data, 1560 currState->longDesc.pxn(), 1561 currState->longDesc.xn(), 1562 currState->longDesc.ap(), 1563 currState->longDesc.af(), 1564 currState->longDesc.type()); 1565 } else { 1566 DPRINTF(TLBVerbose, "Analyzing L%d descriptor: %#llx, type: %d\n", 1567 currState->longDesc.lookupLevel, 1568 currState->longDesc.data, 1569 currState->longDesc.type()); 1570 } 1571 1572 TlbEntry te; 1573 1574 switch (currState->longDesc.type()) { 1575 case LongDescriptor::Invalid: 1576 if (!currState->timing) { 1577 currState->tc = NULL; 1578 currState->req = NULL; 1579 } 1580 1581 DPRINTF(TLB, "L%d descriptor Invalid, causing fault type %d\n", 1582 currState->longDesc.lookupLevel, 1583 ArmFault::TranslationLL + currState->longDesc.lookupLevel); 1584 if (currState->isFetch) 1585 currState->fault = std::make_shared<PrefetchAbort>( 1586 currState->vaddr_tainted, 1587 ArmFault::TranslationLL + currState->longDesc.lookupLevel, 1588 isStage2, 1589 ArmFault::LpaeTran); 1590 else 1591 currState->fault = std::make_shared<DataAbort>( 1592 currState->vaddr_tainted, 1593 TlbEntry::DomainType::NoAccess, 1594 currState->isWrite, 1595 ArmFault::TranslationLL + currState->longDesc.lookupLevel, 1596 isStage2, 1597 ArmFault::LpaeTran); 1598 return; 1599 case LongDescriptor::Block: 1600 case LongDescriptor::Page: 1601 { 1602 bool fault = false; 1603 bool aff = false; 1604 // Check for address size fault 1605 if (checkAddrSizeFaultAArch64( 1606 mbits(currState->longDesc.data, MaxPhysAddrRange - 1, 1607 currState->longDesc.offsetBits()), 1608 currState->physAddrRange)) { 1609 fault = true; 1610 DPRINTF(TLB, "L%d descriptor causing Address Size Fault\n", 1611 currState->longDesc.lookupLevel); 1612 // Check for access fault 1613 } else if (currState->longDesc.af() == 0) { 1614 fault = true; 1615 DPRINTF(TLB, "L%d descriptor causing Access Fault\n", 1616 currState->longDesc.lookupLevel); 1617 aff = true; 1618 } 1619 if (fault) { 1620 if (currState->isFetch) 1621 currState->fault = std::make_shared<PrefetchAbort>( 1622 currState->vaddr_tainted, 1623 (aff ? ArmFault::AccessFlagLL : ArmFault::AddressSizeLL) + 1624 currState->longDesc.lookupLevel, 1625 isStage2, 1626 ArmFault::LpaeTran); 1627 else 1628 currState->fault = std::make_shared<DataAbort>( 1629 currState->vaddr_tainted, 1630 TlbEntry::DomainType::NoAccess, currState->isWrite, 1631 (aff ? ArmFault::AccessFlagLL : ArmFault::AddressSizeLL) + 1632 currState->longDesc.lookupLevel, 1633 isStage2, 1634 ArmFault::LpaeTran); 1635 } else { 1636 insertTableEntry(currState->longDesc, true); 1637 } 1638 } 1639 return; 1640 case LongDescriptor::Table: 1641 { 1642 // Set hierarchical permission flags 1643 currState->secureLookup = currState->secureLookup && 1644 currState->longDesc.secureTable(); 1645 currState->rwTable = currState->rwTable && 1646 currState->longDesc.rwTable(); 1647 currState->userTable = currState->userTable && 1648 currState->longDesc.userTable(); 1649 currState->xnTable = currState->xnTable || 1650 currState->longDesc.xnTable(); 1651 currState->pxnTable = currState->pxnTable || 1652 currState->longDesc.pxnTable(); 1653 1654 // Set up next level lookup 1655 Addr next_desc_addr = currState->longDesc.nextDescAddr( 1656 currState->vaddr); 1657 1658 DPRINTF(TLB, "L%d descriptor points to L%d descriptor at: %#x (%s)\n", 1659 currState->longDesc.lookupLevel, 1660 currState->longDesc.lookupLevel + 1, 1661 next_desc_addr, 1662 currState->secureLookup ? "s" : "ns"); 1663 1664 // Check for address size fault 1665 if (currState->aarch64 && checkAddrSizeFaultAArch64( 1666 next_desc_addr, currState->physAddrRange)) { 1667 DPRINTF(TLB, "L%d descriptor causing Address Size Fault\n", 1668 currState->longDesc.lookupLevel); 1669 if (currState->isFetch) 1670 currState->fault = std::make_shared<PrefetchAbort>( 1671 currState->vaddr_tainted, 1672 ArmFault::AddressSizeLL 1673 + currState->longDesc.lookupLevel, 1674 isStage2, 1675 ArmFault::LpaeTran); 1676 else 1677 currState->fault = std::make_shared<DataAbort>( 1678 currState->vaddr_tainted, 1679 TlbEntry::DomainType::NoAccess, currState->isWrite, 1680 ArmFault::AddressSizeLL 1681 + currState->longDesc.lookupLevel, 1682 isStage2, 1683 ArmFault::LpaeTran); 1684 return; 1685 } 1686 1687 // Trickbox address check 1688 currState->fault = testWalk( 1689 next_desc_addr, sizeof(uint64_t), TlbEntry::DomainType::Client, 1690 toLookupLevel(currState->longDesc.lookupLevel +1)); 1691 1692 if (currState->fault) { 1693 if (!currState->timing) { 1694 currState->tc = NULL; 1695 currState->req = NULL; 1696 } 1697 return; 1698 } 1699 1700 Request::Flags flag = Request::PT_WALK; 1701 if (currState->secureLookup) 1702 flag.set(Request::SECURE); 1703 1704 LookupLevel L = currState->longDesc.lookupLevel = 1705 (LookupLevel) (currState->longDesc.lookupLevel + 1); 1706 Event *event = NULL; 1707 switch (L) { 1708 case L1: 1709 assert(currState->aarch64); 1710 case L2: 1711 case L3: 1712 event = LongDescEventByLevel[L]; 1713 break; 1714 default: 1715 panic("Wrong lookup level in table walk\n"); 1716 break; 1717 } 1718 1719 bool delayed; 1720 delayed = fetchDescriptor(next_desc_addr, (uint8_t*)&currState->longDesc.data, 1721 sizeof(uint64_t), flag, -1, event, 1722 &TableWalker::doLongDescriptor); 1723 if (delayed) { 1724 currState->delayed = true; 1725 } 1726 } 1727 return; 1728 default: 1729 panic("A new type in a 2 bit field?\n"); 1730 } 1731} 1732 1733void 1734TableWalker::doL2Descriptor() 1735{ 1736 if (currState->fault != NoFault) { 1737 return; 1738 } 1739 1740 currState->l2Desc.data = htog(currState->l2Desc.data, 1741 byteOrder(currState->tc)); 1742 1743 DPRINTF(TLB, "L2 descriptor for %#x is %#x\n", 1744 currState->vaddr_tainted, currState->l2Desc.data); 1745 TlbEntry te; 1746 1747 if (currState->l2Desc.invalid()) { 1748 DPRINTF(TLB, "L2 descriptor invalid, causing fault\n"); 1749 if (!currState->timing) { 1750 currState->tc = NULL; 1751 currState->req = NULL; 1752 } 1753 if (currState->isFetch) 1754 currState->fault = std::make_shared<PrefetchAbort>( 1755 currState->vaddr_tainted, 1756 ArmFault::TranslationLL + L2, 1757 isStage2, 1758 ArmFault::VmsaTran); 1759 else 1760 currState->fault = std::make_shared<DataAbort>( 1761 currState->vaddr_tainted, currState->l1Desc.domain(), 1762 currState->isWrite, ArmFault::TranslationLL + L2, 1763 isStage2, 1764 ArmFault::VmsaTran); 1765 return; 1766 } 1767 1768 if (currState->sctlr.afe && bits(currState->l2Desc.ap(), 0) == 0) { 1769 /** @todo: check sctlr.ha (bit[17]) if Hardware Access Flag is enabled 1770 * if set, do l2.Desc.setAp0() instead of generating AccessFlag0 1771 */ 1772 DPRINTF(TLB, "Generating access fault at L2, afe: %d, ap: %d\n", 1773 currState->sctlr.afe, currState->l2Desc.ap()); 1774 1775 currState->fault = std::make_shared<DataAbort>( 1776 currState->vaddr_tainted, 1777 TlbEntry::DomainType::NoAccess, currState->isWrite, 1778 ArmFault::AccessFlagLL + L2, isStage2, 1779 ArmFault::VmsaTran); 1780 } 1781 1782 insertTableEntry(currState->l2Desc, false); 1783} 1784 1785void 1786TableWalker::doL1DescriptorWrapper() 1787{ 1788 currState = stateQueues[L1].front(); 1789 currState->delayed = false; 1790 // if there's a stage2 translation object we don't need it any more 1791 if (currState->stage2Tran) { 1792 delete currState->stage2Tran; 1793 currState->stage2Tran = NULL; 1794 } 1795 1796 1797 DPRINTF(TLBVerbose, "L1 Desc object host addr: %p\n",&currState->l1Desc.data); 1798 DPRINTF(TLBVerbose, "L1 Desc object data: %08x\n",currState->l1Desc.data); 1799 1800 DPRINTF(TLBVerbose, "calling doL1Descriptor for vaddr:%#x\n", currState->vaddr_tainted); 1801 doL1Descriptor(); 1802 1803 stateQueues[L1].pop_front(); 1804 // Check if fault was generated 1805 if (currState->fault != NoFault) { 1806 currState->transState->finish(currState->fault, currState->req, 1807 currState->tc, currState->mode); 1808 statWalksShortTerminatedAtLevel[0]++; 1809 1810 pending = false; 1811 nextWalk(currState->tc); 1812 1813 currState->req = NULL; 1814 currState->tc = NULL; 1815 currState->delayed = false; 1816 delete currState; 1817 } 1818 else if (!currState->delayed) { 1819 // delay is not set so there is no L2 to do 1820 // Don't finish the translation if a stage 2 look up is underway 1821 statWalkServiceTime.sample(curTick() - currState->startTime); 1822 DPRINTF(TLBVerbose, "calling translateTiming again\n"); 1823 tlb->translateTiming(currState->req, currState->tc, 1824 currState->transState, currState->mode); 1825 statWalksShortTerminatedAtLevel[0]++; 1826 1827 pending = false; 1828 nextWalk(currState->tc); 1829 1830 currState->req = NULL; 1831 currState->tc = NULL; 1832 currState->delayed = false; 1833 delete currState; 1834 } else { 1835 // need to do L2 descriptor 1836 stateQueues[L2].push_back(currState); 1837 } 1838 currState = NULL; 1839} 1840 1841void 1842TableWalker::doL2DescriptorWrapper() 1843{ 1844 currState = stateQueues[L2].front(); 1845 assert(currState->delayed); 1846 // if there's a stage2 translation object we don't need it any more 1847 if (currState->stage2Tran) { 1848 delete currState->stage2Tran; 1849 currState->stage2Tran = NULL; 1850 } 1851 1852 DPRINTF(TLBVerbose, "calling doL2Descriptor for vaddr:%#x\n", 1853 currState->vaddr_tainted); 1854 doL2Descriptor(); 1855 1856 // Check if fault was generated 1857 if (currState->fault != NoFault) { 1858 currState->transState->finish(currState->fault, currState->req, 1859 currState->tc, currState->mode); 1860 statWalksShortTerminatedAtLevel[1]++; 1861 } else { 1862 statWalkServiceTime.sample(curTick() - currState->startTime); 1863 DPRINTF(TLBVerbose, "calling translateTiming again\n"); 1864 tlb->translateTiming(currState->req, currState->tc, 1865 currState->transState, currState->mode); 1866 statWalksShortTerminatedAtLevel[1]++; 1867 } 1868 1869 1870 stateQueues[L2].pop_front(); 1871 pending = false; 1872 nextWalk(currState->tc); 1873 1874 currState->req = NULL; 1875 currState->tc = NULL; 1876 currState->delayed = false; 1877 1878 delete currState; 1879 currState = NULL; 1880} 1881 1882void 1883TableWalker::doL0LongDescriptorWrapper() 1884{ 1885 doLongDescriptorWrapper(L0); 1886} 1887 1888void 1889TableWalker::doL1LongDescriptorWrapper() 1890{ 1891 doLongDescriptorWrapper(L1); 1892} 1893 1894void 1895TableWalker::doL2LongDescriptorWrapper() 1896{ 1897 doLongDescriptorWrapper(L2); 1898} 1899 1900void 1901TableWalker::doL3LongDescriptorWrapper() 1902{ 1903 doLongDescriptorWrapper(L3); 1904} 1905 1906void 1907TableWalker::doLongDescriptorWrapper(LookupLevel curr_lookup_level) 1908{ 1909 currState = stateQueues[curr_lookup_level].front(); 1910 assert(curr_lookup_level == currState->longDesc.lookupLevel); 1911 currState->delayed = false; 1912 1913 // if there's a stage2 translation object we don't need it any more 1914 if (currState->stage2Tran) { 1915 delete currState->stage2Tran; 1916 currState->stage2Tran = NULL; 1917 } 1918 1919 DPRINTF(TLBVerbose, "calling doLongDescriptor for vaddr:%#x\n", 1920 currState->vaddr_tainted); 1921 doLongDescriptor(); 1922 1923 stateQueues[curr_lookup_level].pop_front(); 1924 1925 if (currState->fault != NoFault) { 1926 // A fault was generated 1927 currState->transState->finish(currState->fault, currState->req, 1928 currState->tc, currState->mode); 1929 1930 pending = false; 1931 nextWalk(currState->tc); 1932 1933 currState->req = NULL; 1934 currState->tc = NULL; 1935 currState->delayed = false; 1936 delete currState; 1937 } else if (!currState->delayed) { 1938 // No additional lookups required 1939 DPRINTF(TLBVerbose, "calling translateTiming again\n"); 1940 statWalkServiceTime.sample(curTick() - currState->startTime); 1941 tlb->translateTiming(currState->req, currState->tc, 1942 currState->transState, currState->mode); 1943 statWalksLongTerminatedAtLevel[(unsigned) curr_lookup_level]++; 1944 1945 pending = false; 1946 nextWalk(currState->tc); 1947 1948 currState->req = NULL; 1949 currState->tc = NULL; 1950 currState->delayed = false; 1951 delete currState; 1952 } else { 1953 if (curr_lookup_level >= MAX_LOOKUP_LEVELS - 1) 1954 panic("Max. number of lookups already reached in table walk\n"); 1955 // Need to perform additional lookups 1956 stateQueues[currState->longDesc.lookupLevel].push_back(currState); 1957 } 1958 currState = NULL; 1959} 1960 1961 1962void 1963TableWalker::nextWalk(ThreadContext *tc) 1964{ 1965 if (pendingQueue.size()) 1966 schedule(doProcessEvent, clockEdge(Cycles(1))); 1967 else 1968 completeDrain(); 1969} 1970 1971bool 1972TableWalker::fetchDescriptor(Addr descAddr, uint8_t *data, int numBytes, 1973 Request::Flags flags, int queueIndex, Event *event, 1974 void (TableWalker::*doDescriptor)()) 1975{ 1976 bool isTiming = currState->timing; 1977 1978 DPRINTF(TLBVerbose, "Fetching descriptor at address: 0x%x stage2Req: %d\n", 1979 descAddr, currState->stage2Req); 1980 1981 // If this translation has a stage 2 then we know descAddr is an IPA and 1982 // needs to be translated before we can access the page table. Do that 1983 // check here. 1984 if (currState->stage2Req) { 1985 Fault fault; 1986 flags = flags | TLB::MustBeOne; 1987 1988 if (isTiming) { 1989 Stage2MMU::Stage2Translation *tran = new 1990 Stage2MMU::Stage2Translation(*stage2Mmu, data, event, 1991 currState->vaddr); 1992 currState->stage2Tran = tran; 1993 stage2Mmu->readDataTimed(currState->tc, descAddr, tran, numBytes, 1994 flags); 1995 fault = tran->fault; 1996 } else { 1997 fault = stage2Mmu->readDataUntimed(currState->tc, 1998 currState->vaddr, descAddr, data, numBytes, flags, 1999 currState->functional); 2000 } 2001 2002 if (fault != NoFault) { 2003 currState->fault = fault; 2004 } 2005 if (isTiming) { 2006 if (queueIndex >= 0) { 2007 DPRINTF(TLBVerbose, "Adding to walker fifo: queue size before adding: %d\n", 2008 stateQueues[queueIndex].size()); 2009 stateQueues[queueIndex].push_back(currState); 2010 currState = NULL; 2011 } 2012 } else { 2013 (this->*doDescriptor)(); 2014 } 2015 } else { 2016 if (isTiming) { 2017 port->dmaAction(MemCmd::ReadReq, descAddr, numBytes, event, data, 2018 currState->tc->getCpuPtr()->clockPeriod(),flags); 2019 if (queueIndex >= 0) { 2020 DPRINTF(TLBVerbose, "Adding to walker fifo: queue size before adding: %d\n", 2021 stateQueues[queueIndex].size()); 2022 stateQueues[queueIndex].push_back(currState); 2023 currState = NULL; 2024 } 2025 } else if (!currState->functional) { 2026 port->dmaAction(MemCmd::ReadReq, descAddr, numBytes, NULL, data, 2027 currState->tc->getCpuPtr()->clockPeriod(), flags); 2028 (this->*doDescriptor)(); 2029 } else { 2030 RequestPtr req = std::make_shared<Request>( 2031 descAddr, numBytes, flags, masterId); 2032 2033 req->taskId(ContextSwitchTaskId::DMA); 2034 PacketPtr pkt = new Packet(req, MemCmd::ReadReq); 2035 pkt->dataStatic(data); 2036 port->sendFunctional(pkt); 2037 (this->*doDescriptor)(); 2038 delete pkt; 2039 } 2040 } 2041 return (isTiming); 2042} 2043 2044void 2045TableWalker::insertTableEntry(DescriptorBase &descriptor, bool longDescriptor) 2046{ 2047 TlbEntry te; 2048 2049 // Create and fill a new page table entry 2050 te.valid = true; 2051 te.longDescFormat = longDescriptor; 2052 te.isHyp = currState->isHyp; 2053 te.asid = currState->asid; 2054 te.vmid = currState->vmid; 2055 te.N = descriptor.offsetBits(); 2056 te.vpn = currState->vaddr >> te.N; 2057 te.size = (1<<te.N) - 1; 2058 te.pfn = descriptor.pfn(); 2059 te.domain = descriptor.domain(); 2060 te.lookupLevel = descriptor.lookupLevel; 2061 te.ns = !descriptor.secure(haveSecurity, currState) || isStage2; 2062 te.nstid = !currState->isSecure; 2063 te.xn = descriptor.xn(); 2064 if (currState->aarch64) 2065 te.el = currState->el; 2066 else 2067 te.el = EL1; 2068 2069 statPageSizes[pageSizeNtoStatBin(te.N)]++; 2070 statRequestOrigin[COMPLETED][currState->isFetch]++; 2071 2072 // ASID has no meaning for stage 2 TLB entries, so mark all stage 2 entries 2073 // as global 2074 te.global = descriptor.global(currState) || isStage2; 2075 if (longDescriptor) { 2076 LongDescriptor lDescriptor = 2077 dynamic_cast<LongDescriptor &>(descriptor); 2078 2079 te.xn |= currState->xnTable; 2080 te.pxn = currState->pxnTable || lDescriptor.pxn(); 2081 if (isStage2) { 2082 // this is actually the HAP field, but its stored in the same bit 2083 // possitions as the AP field in a stage 1 translation. 2084 te.hap = lDescriptor.ap(); 2085 } else { 2086 te.ap = ((!currState->rwTable || descriptor.ap() >> 1) << 1) | 2087 (currState->userTable && (descriptor.ap() & 0x1)); 2088 } 2089 if (currState->aarch64) 2090 memAttrsAArch64(currState->tc, te, lDescriptor); 2091 else 2092 memAttrsLPAE(currState->tc, te, lDescriptor); 2093 } else { 2094 te.ap = descriptor.ap(); 2095 memAttrs(currState->tc, te, currState->sctlr, descriptor.texcb(), 2096 descriptor.shareable()); 2097 } 2098 2099 // Debug output 2100 DPRINTF(TLB, descriptor.dbgHeader().c_str()); 2101 DPRINTF(TLB, " - N:%d pfn:%#x size:%#x global:%d valid:%d\n", 2102 te.N, te.pfn, te.size, te.global, te.valid); 2103 DPRINTF(TLB, " - vpn:%#x xn:%d pxn:%d ap:%d domain:%d asid:%d " 2104 "vmid:%d hyp:%d nc:%d ns:%d\n", te.vpn, te.xn, te.pxn, 2105 te.ap, static_cast<uint8_t>(te.domain), te.asid, te.vmid, te.isHyp, 2106 te.nonCacheable, te.ns); 2107 DPRINTF(TLB, " - domain from L%d desc:%d data:%#x\n", 2108 descriptor.lookupLevel, static_cast<uint8_t>(descriptor.domain()), 2109 descriptor.getRawData()); 2110 2111 // Insert the entry into the TLB 2112 tlb->insert(currState->vaddr, te); 2113 if (!currState->timing) { 2114 currState->tc = NULL; 2115 currState->req = NULL; 2116 } 2117} 2118 2119ArmISA::TableWalker * 2120ArmTableWalkerParams::create() 2121{ 2122 return new ArmISA::TableWalker(this); 2123} 2124 2125LookupLevel 2126TableWalker::toLookupLevel(uint8_t lookup_level_as_int) 2127{ 2128 switch (lookup_level_as_int) { 2129 case L1: 2130 return L1; 2131 case L2: 2132 return L2; 2133 case L3: 2134 return L3; 2135 default: 2136 panic("Invalid lookup level conversion"); 2137 } 2138} 2139 2140/* this method keeps track of the table walker queue's residency, so 2141 * needs to be called whenever requests start and complete. */ 2142void 2143TableWalker::pendingChange() 2144{ 2145 unsigned n = pendingQueue.size(); 2146 if ((currState != NULL) && (currState != pendingQueue.front())) { 2147 ++n; 2148 } 2149 2150 if (n != pendingReqs) { 2151 Tick now = curTick(); 2152 statPendingWalks.sample(pendingReqs, now - pendingChangeTick); 2153 pendingReqs = n; 2154 pendingChangeTick = now; 2155 } 2156} 2157 2158Fault 2159TableWalker::testWalk(Addr pa, Addr size, TlbEntry::DomainType domain, 2160 LookupLevel lookup_level) 2161{ 2162 return tlb->testWalk(pa, size, currState->vaddr, currState->isSecure, 2163 currState->mode, domain, lookup_level); 2164} 2165 2166 2167uint8_t 2168TableWalker::pageSizeNtoStatBin(uint8_t N) 2169{ 2170 /* for statPageSizes */ 2171 switch(N) { 2172 case 12: return 0; // 4K 2173 case 14: return 1; // 16K (using 16K granule in v8-64) 2174 case 16: return 2; // 64K 2175 case 20: return 3; // 1M 2176 case 21: return 4; // 2M-LPAE 2177 case 24: return 5; // 16M 2178 case 25: return 6; // 32M (using 16K granule in v8-64) 2179 case 29: return 7; // 512M (using 64K granule in v8-64) 2180 case 30: return 8; // 1G-LPAE 2181 default: 2182 panic("unknown page size"); 2183 return 255; 2184 } 2185} 2186 2187void 2188TableWalker::regStats() 2189{ 2190 ClockedObject::regStats(); 2191 2192 statWalks 2193 .name(name() + ".walks") 2194 .desc("Table walker walks requested") 2195 ; 2196 2197 statWalksShortDescriptor 2198 .name(name() + ".walksShort") 2199 .desc("Table walker walks initiated with short descriptors") 2200 .flags(Stats::nozero) 2201 ; 2202 2203 statWalksLongDescriptor 2204 .name(name() + ".walksLong") 2205 .desc("Table walker walks initiated with long descriptors") 2206 .flags(Stats::nozero) 2207 ; 2208 2209 statWalksShortTerminatedAtLevel 2210 .init(2) 2211 .name(name() + ".walksShortTerminationLevel") 2212 .desc("Level at which table walker walks " 2213 "with short descriptors terminate") 2214 .flags(Stats::nozero) 2215 ; 2216 statWalksShortTerminatedAtLevel.subname(0, "Level1"); 2217 statWalksShortTerminatedAtLevel.subname(1, "Level2"); 2218 2219 statWalksLongTerminatedAtLevel 2220 .init(4) 2221 .name(name() + ".walksLongTerminationLevel") 2222 .desc("Level at which table walker walks " 2223 "with long descriptors terminate") 2224 .flags(Stats::nozero) 2225 ; 2226 statWalksLongTerminatedAtLevel.subname(0, "Level0"); 2227 statWalksLongTerminatedAtLevel.subname(1, "Level1"); 2228 statWalksLongTerminatedAtLevel.subname(2, "Level2"); 2229 statWalksLongTerminatedAtLevel.subname(3, "Level3"); 2230 2231 statSquashedBefore 2232 .name(name() + ".walksSquashedBefore") 2233 .desc("Table walks squashed before starting") 2234 .flags(Stats::nozero) 2235 ; 2236 2237 statSquashedAfter 2238 .name(name() + ".walksSquashedAfter") 2239 .desc("Table walks squashed after completion") 2240 .flags(Stats::nozero) 2241 ; 2242 2243 statWalkWaitTime 2244 .init(16) 2245 .name(name() + ".walkWaitTime") 2246 .desc("Table walker wait (enqueue to first request) latency") 2247 .flags(Stats::pdf | Stats::nozero | Stats::nonan) 2248 ; 2249 2250 statWalkServiceTime 2251 .init(16) 2252 .name(name() + ".walkCompletionTime") 2253 .desc("Table walker service (enqueue to completion) latency") 2254 .flags(Stats::pdf | Stats::nozero | Stats::nonan) 2255 ; 2256 2257 statPendingWalks 2258 .init(16) 2259 .name(name() + ".walksPending") 2260 .desc("Table walker pending requests distribution") 2261 .flags(Stats::pdf | Stats::dist | Stats::nozero | Stats::nonan) 2262 ; 2263 2264 statPageSizes // see DDI 0487A D4-1661 2265 .init(9) 2266 .name(name() + ".walkPageSizes") 2267 .desc("Table walker page sizes translated") 2268 .flags(Stats::total | Stats::pdf | Stats::dist | Stats::nozero) 2269 ; 2270 statPageSizes.subname(0, "4K"); 2271 statPageSizes.subname(1, "16K"); 2272 statPageSizes.subname(2, "64K"); 2273 statPageSizes.subname(3, "1M"); 2274 statPageSizes.subname(4, "2M"); 2275 statPageSizes.subname(5, "16M"); 2276 statPageSizes.subname(6, "32M"); 2277 statPageSizes.subname(7, "512M"); 2278 statPageSizes.subname(8, "1G"); 2279 2280 statRequestOrigin 2281 .init(2,2) // Instruction/Data, requests/completed 2282 .name(name() + ".walkRequestOrigin") 2283 .desc("Table walker requests started/completed, data/inst") 2284 .flags(Stats::total) 2285 ; 2286 statRequestOrigin.subname(0,"Requested"); 2287 statRequestOrigin.subname(1,"Completed"); 2288 statRequestOrigin.ysubname(0,"Data"); 2289 statRequestOrigin.ysubname(1,"Inst"); 2290} 2291