interrupts.cc revision 6041
1/* 2 * Copyright (c) 2008 The Hewlett-Packard Development Company 3 * All rights reserved. 4 * 5 * Redistribution and use of this software in source and binary forms, 6 * with or without modification, are permitted provided that the 7 * following conditions are met: 8 * 9 * The software must be used only for Non-Commercial Use which means any 10 * use which is NOT directed to receiving any direct monetary 11 * compensation for, or commercial advantage from such use. Illustrative 12 * examples of non-commercial use are academic research, personal study, 13 * teaching, education and corporate research & development. 14 * Illustrative examples of commercial use are distributing products for 15 * commercial advantage and providing services using the software for 16 * commercial advantage. 17 * 18 * If you wish to use this software or functionality therein that may be 19 * covered by patents for commercial use, please contact: 20 * Director of Intellectual Property Licensing 21 * Office of Strategy and Technology 22 * Hewlett-Packard Company 23 * 1501 Page Mill Road 24 * Palo Alto, California 94304 25 * 26 * Redistributions of source code must retain the above copyright notice, 27 * this list of conditions and the following disclaimer. Redistributions 28 * in binary form must reproduce the above copyright notice, this list of 29 * conditions and the following disclaimer in the documentation and/or 30 * other materials provided with the distribution. Neither the name of 31 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its 32 * contributors may be used to endorse or promote products derived from 33 * this software without specific prior written permission. No right of 34 * sublicense is granted herewith. Derivatives of the software and 35 * output created using the software may be prepared, but only for 36 * Non-Commercial Uses. Derivatives of the software may be shared with 37 * others provided: (i) the others agree to abide by the list of 38 * conditions herein which includes the Non-Commercial Use restrictions; 39 * and (ii) such Derivatives of the software include the above copyright 40 * notice to acknowledge the contribution from this software where 41 * applicable, this list of conditions and the disclaimer below. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * 55 * Authors: Gabe Black 56 */ 57 58#include "arch/x86/apicregs.hh" 59#include "arch/x86/interrupts.hh" 60#include "arch/x86/intmessage.hh" 61#include "cpu/base.hh" 62#include "mem/packet_access.hh" 63 64int 65divideFromConf(uint32_t conf) 66{ 67 // This figures out what division we want from the division configuration 68 // register in the local APIC. The encoding is a little odd but it can 69 // be deciphered fairly easily. 70 int shift = ((conf & 0x8) >> 1) | (conf & 0x3); 71 shift = (shift + 1) % 8; 72 return 1 << shift; 73} 74 75namespace X86ISA 76{ 77 78ApicRegIndex 79decodeAddr(Addr paddr) 80{ 81 ApicRegIndex regNum; 82 paddr &= ~mask(3); 83 switch (paddr) 84 { 85 case 0x20: 86 regNum = APIC_ID; 87 break; 88 case 0x30: 89 regNum = APIC_VERSION; 90 break; 91 case 0x80: 92 regNum = APIC_TASK_PRIORITY; 93 break; 94 case 0x90: 95 regNum = APIC_ARBITRATION_PRIORITY; 96 break; 97 case 0xA0: 98 regNum = APIC_PROCESSOR_PRIORITY; 99 break; 100 case 0xB0: 101 regNum = APIC_EOI; 102 break; 103 case 0xD0: 104 regNum = APIC_LOGICAL_DESTINATION; 105 break; 106 case 0xE0: 107 regNum = APIC_DESTINATION_FORMAT; 108 break; 109 case 0xF0: 110 regNum = APIC_SPURIOUS_INTERRUPT_VECTOR; 111 break; 112 case 0x100: 113 case 0x108: 114 case 0x110: 115 case 0x118: 116 case 0x120: 117 case 0x128: 118 case 0x130: 119 case 0x138: 120 case 0x140: 121 case 0x148: 122 case 0x150: 123 case 0x158: 124 case 0x160: 125 case 0x168: 126 case 0x170: 127 case 0x178: 128 regNum = APIC_IN_SERVICE((paddr - 0x100) / 0x8); 129 break; 130 case 0x180: 131 case 0x188: 132 case 0x190: 133 case 0x198: 134 case 0x1A0: 135 case 0x1A8: 136 case 0x1B0: 137 case 0x1B8: 138 case 0x1C0: 139 case 0x1C8: 140 case 0x1D0: 141 case 0x1D8: 142 case 0x1E0: 143 case 0x1E8: 144 case 0x1F0: 145 case 0x1F8: 146 regNum = APIC_TRIGGER_MODE((paddr - 0x180) / 0x8); 147 break; 148 case 0x200: 149 case 0x208: 150 case 0x210: 151 case 0x218: 152 case 0x220: 153 case 0x228: 154 case 0x230: 155 case 0x238: 156 case 0x240: 157 case 0x248: 158 case 0x250: 159 case 0x258: 160 case 0x260: 161 case 0x268: 162 case 0x270: 163 case 0x278: 164 regNum = APIC_INTERRUPT_REQUEST((paddr - 0x200) / 0x8); 165 break; 166 case 0x280: 167 regNum = APIC_ERROR_STATUS; 168 break; 169 case 0x300: 170 regNum = APIC_INTERRUPT_COMMAND_LOW; 171 break; 172 case 0x310: 173 regNum = APIC_INTERRUPT_COMMAND_HIGH; 174 break; 175 case 0x320: 176 regNum = APIC_LVT_TIMER; 177 break; 178 case 0x330: 179 regNum = APIC_LVT_THERMAL_SENSOR; 180 break; 181 case 0x340: 182 regNum = APIC_LVT_PERFORMANCE_MONITORING_COUNTERS; 183 break; 184 case 0x350: 185 regNum = APIC_LVT_LINT0; 186 break; 187 case 0x360: 188 regNum = APIC_LVT_LINT1; 189 break; 190 case 0x370: 191 regNum = APIC_LVT_ERROR; 192 break; 193 case 0x380: 194 regNum = APIC_INITIAL_COUNT; 195 break; 196 case 0x390: 197 regNum = APIC_CURRENT_COUNT; 198 break; 199 case 0x3E0: 200 regNum = APIC_DIVIDE_CONFIGURATION; 201 break; 202 default: 203 // A reserved register field. 204 panic("Accessed reserved register field %#x.\n", paddr); 205 break; 206 } 207 return regNum; 208} 209} 210 211Tick 212X86ISA::Interrupts::read(PacketPtr pkt) 213{ 214 Addr offset = pkt->getAddr() - pioAddr; 215 //Make sure we're at least only accessing one register. 216 if ((offset & ~mask(3)) != ((offset + pkt->getSize()) & ~mask(3))) 217 panic("Accessed more than one register at a time in the APIC!\n"); 218 ApicRegIndex reg = decodeAddr(offset); 219 uint32_t val = htog(readReg(reg)); 220 DPRINTF(LocalApic, 221 "Reading Local APIC register %d at offset %#x as %#x.\n", 222 reg, offset, val); 223 pkt->setData(((uint8_t *)&val) + (offset & mask(3))); 224 pkt->makeAtomicResponse(); 225 return latency; 226} 227 228Tick 229X86ISA::Interrupts::write(PacketPtr pkt) 230{ 231 Addr offset = pkt->getAddr() - pioAddr; 232 //Make sure we're at least only accessing one register. 233 if ((offset & ~mask(3)) != ((offset + pkt->getSize()) & ~mask(3))) 234 panic("Accessed more than one register at a time in the APIC!\n"); 235 ApicRegIndex reg = decodeAddr(offset); 236 uint32_t val = regs[reg]; 237 pkt->writeData(((uint8_t *)&val) + (offset & mask(3))); 238 DPRINTF(LocalApic, 239 "Writing Local APIC register %d at offset %#x as %#x.\n", 240 reg, offset, gtoh(val)); 241 setReg(reg, gtoh(val)); 242 pkt->makeAtomicResponse(); 243 return latency; 244} 245void 246X86ISA::Interrupts::requestInterrupt(uint8_t vector, 247 uint8_t deliveryMode, bool level) 248{ 249 /* 250 * Fixed and lowest-priority delivery mode interrupts are handled 251 * using the IRR/ISR registers, checking against the TPR, etc. 252 * The SMI, NMI, ExtInt, INIT, etc interrupts go straight through. 253 */ 254 if (deliveryMode == DeliveryMode::Fixed || 255 deliveryMode == DeliveryMode::LowestPriority) { 256 DPRINTF(LocalApic, "Interrupt is an %s.\n", 257 DeliveryMode::names[deliveryMode]); 258 // Queue up the interrupt in the IRR. 259 if (vector > IRRV) 260 IRRV = vector; 261 if (!getRegArrayBit(APIC_INTERRUPT_REQUEST_BASE, vector)) { 262 setRegArrayBit(APIC_INTERRUPT_REQUEST_BASE, vector); 263 if (level) { 264 setRegArrayBit(APIC_TRIGGER_MODE_BASE, vector); 265 } else { 266 clearRegArrayBit(APIC_TRIGGER_MODE_BASE, vector); 267 } 268 } 269 } else if (!DeliveryMode::isReserved(deliveryMode)) { 270 DPRINTF(LocalApic, "Interrupt is an %s.\n", 271 DeliveryMode::names[deliveryMode]); 272 if (deliveryMode == DeliveryMode::SMI && !pendingSmi) { 273 pendingUnmaskableInt = pendingSmi = true; 274 smiVector = vector; 275 } else if (deliveryMode == DeliveryMode::NMI && !pendingNmi) { 276 pendingUnmaskableInt = pendingNmi = true; 277 nmiVector = vector; 278 } else if (deliveryMode == DeliveryMode::ExtInt && !pendingExtInt) { 279 pendingExtInt = true; 280 extIntVector = vector; 281 } else if (deliveryMode == DeliveryMode::INIT && !pendingInit) { 282 pendingUnmaskableInt = pendingInit = true; 283 initVector = vector; 284 } 285 } 286 cpu->wakeup(); 287} 288 289 290void 291X86ISA::Interrupts::setCPU(BaseCPU * newCPU) 292{ 293 cpu = newCPU; 294 assert(cpu); 295 regs[APIC_ID] = (cpu->cpuId() << 24); 296} 297 298 299Tick 300X86ISA::Interrupts::recvMessage(PacketPtr pkt) 301{ 302 uint8_t id = (regs[APIC_ID] >> 24); 303 Addr offset = pkt->getAddr() - x86InterruptAddress(id, 0); 304 assert(pkt->cmd == MemCmd::MessageReq); 305 switch(offset) 306 { 307 case 0: 308 { 309 TriggerIntMessage message = pkt->get<TriggerIntMessage>(); 310 DPRINTF(LocalApic, 311 "Got Trigger Interrupt message with vector %#x.\n", 312 message.vector); 313 // Make sure we're really supposed to get this. 314 assert((message.destMode == 0 && message.destination == id) || 315 (bits((int)message.destination, id))); 316 317 requestInterrupt(message.vector, 318 message.deliveryMode, message.trigger); 319 } 320 break; 321 default: 322 panic("Local apic got unknown interrupt message at offset %#x.\n", 323 offset); 324 break; 325 } 326 delete pkt->req; 327 delete pkt; 328 return latency; 329} 330 331 332void 333X86ISA::Interrupts::addressRanges(AddrRangeList &range_list) 334{ 335 uint8_t id = (regs[APIC_ID] >> 24); 336 range_list.clear(); 337 range_list.push_back(RangeEx(x86LocalAPICAddress(id, 0), 338 x86LocalAPICAddress(id, 0) + PageBytes)); 339} 340 341 342void 343X86ISA::Interrupts::getIntAddrRange(AddrRangeList &range_list) 344{ 345 uint8_t id = (regs[APIC_ID] >> 24); 346 range_list.clear(); 347 range_list.push_back(RangeEx(x86InterruptAddress(id, 0), 348 x86InterruptAddress(id, 0) + PhysAddrAPICRangeSize)); 349} 350 351 352uint32_t 353X86ISA::Interrupts::readReg(ApicRegIndex reg) 354{ 355 if (reg >= APIC_TRIGGER_MODE(0) && 356 reg <= APIC_TRIGGER_MODE(15)) { 357 panic("Local APIC Trigger Mode registers are unimplemented.\n"); 358 } 359 switch (reg) { 360 case APIC_ARBITRATION_PRIORITY: 361 panic("Local APIC Arbitration Priority register unimplemented.\n"); 362 break; 363 case APIC_PROCESSOR_PRIORITY: 364 panic("Local APIC Processor Priority register unimplemented.\n"); 365 break; 366 case APIC_ERROR_STATUS: 367 regs[APIC_INTERNAL_STATE] &= ~ULL(0x1); 368 break; 369 case APIC_INTERRUPT_COMMAND_LOW: 370 panic("Local APIC Interrupt Command low" 371 " register unimplemented.\n"); 372 break; 373 case APIC_INTERRUPT_COMMAND_HIGH: 374 panic("Local APIC Interrupt Command high" 375 " register unimplemented.\n"); 376 break; 377 case APIC_CURRENT_COUNT: 378 { 379 if (apicTimerEvent.scheduled()) { 380 assert(clock); 381 // Compute how many m5 ticks happen per count. 382 uint64_t ticksPerCount = clock * 383 divideFromConf(regs[APIC_DIVIDE_CONFIGURATION]); 384 // Compute how many m5 ticks are left. 385 uint64_t val = apicTimerEvent.when() - curTick; 386 // Turn that into a count. 387 val = (val + ticksPerCount - 1) / ticksPerCount; 388 return val; 389 } else { 390 return 0; 391 } 392 } 393 default: 394 break; 395 } 396 return regs[reg]; 397} 398 399void 400X86ISA::Interrupts::setReg(ApicRegIndex reg, uint32_t val) 401{ 402 uint32_t newVal = val; 403 if (reg >= APIC_IN_SERVICE(0) && 404 reg <= APIC_IN_SERVICE(15)) { 405 panic("Local APIC In-Service registers are unimplemented.\n"); 406 } 407 if (reg >= APIC_TRIGGER_MODE(0) && 408 reg <= APIC_TRIGGER_MODE(15)) { 409 panic("Local APIC Trigger Mode registers are unimplemented.\n"); 410 } 411 if (reg >= APIC_INTERRUPT_REQUEST(0) && 412 reg <= APIC_INTERRUPT_REQUEST(15)) { 413 panic("Local APIC Interrupt Request registers " 414 "are unimplemented.\n"); 415 } 416 switch (reg) { 417 case APIC_ID: 418 newVal = val & 0xFF; 419 break; 420 case APIC_VERSION: 421 // The Local APIC Version register is read only. 422 return; 423 case APIC_TASK_PRIORITY: 424 newVal = val & 0xFF; 425 break; 426 case APIC_ARBITRATION_PRIORITY: 427 panic("Local APIC Arbitration Priority register unimplemented.\n"); 428 break; 429 case APIC_PROCESSOR_PRIORITY: 430 panic("Local APIC Processor Priority register unimplemented.\n"); 431 break; 432 case APIC_EOI: 433 // Remove the interrupt that just completed from the local apic state. 434 clearRegArrayBit(APIC_IN_SERVICE_BASE, ISRV); 435 updateISRV(); 436 return; 437 case APIC_LOGICAL_DESTINATION: 438 newVal = val & 0xFF000000; 439 break; 440 case APIC_DESTINATION_FORMAT: 441 newVal = val | 0x0FFFFFFF; 442 break; 443 case APIC_SPURIOUS_INTERRUPT_VECTOR: 444 regs[APIC_INTERNAL_STATE] &= ~ULL(1 << 1); 445 regs[APIC_INTERNAL_STATE] |= val & (1 << 8); 446 if (val & (1 << 9)) 447 warn("Focus processor checking not implemented.\n"); 448 break; 449 case APIC_ERROR_STATUS: 450 { 451 if (regs[APIC_INTERNAL_STATE] & 0x1) { 452 regs[APIC_INTERNAL_STATE] &= ~ULL(0x1); 453 newVal = 0; 454 } else { 455 regs[APIC_INTERNAL_STATE] |= ULL(0x1); 456 return; 457 } 458 459 } 460 break; 461 case APIC_INTERRUPT_COMMAND_LOW: 462 panic("Local APIC Interrupt Command low" 463 " register unimplemented.\n"); 464 break; 465 case APIC_INTERRUPT_COMMAND_HIGH: 466 panic("Local APIC Interrupt Command high" 467 " register unimplemented.\n"); 468 break; 469 case APIC_LVT_TIMER: 470 case APIC_LVT_THERMAL_SENSOR: 471 case APIC_LVT_PERFORMANCE_MONITORING_COUNTERS: 472 case APIC_LVT_LINT0: 473 case APIC_LVT_LINT1: 474 case APIC_LVT_ERROR: 475 { 476 uint64_t readOnlyMask = (1 << 12) | (1 << 14); 477 newVal = (val & ~readOnlyMask) | 478 (regs[reg] & readOnlyMask); 479 } 480 break; 481 case APIC_INITIAL_COUNT: 482 { 483 assert(clock); 484 newVal = bits(val, 31, 0); 485 // Compute how many timer ticks we're being programmed for. 486 uint64_t newCount = newVal * 487 (divideFromConf(regs[APIC_DIVIDE_CONFIGURATION])); 488 // Schedule on the edge of the next tick plus the new count. 489 Tick offset = curTick % clock; 490 if (offset) { 491 reschedule(apicTimerEvent, 492 curTick + (newCount + 1) * clock - offset, true); 493 } else { 494 reschedule(apicTimerEvent, 495 curTick + newCount * clock, true); 496 } 497 } 498 break; 499 case APIC_CURRENT_COUNT: 500 //Local APIC Current Count register is read only. 501 return; 502 case APIC_DIVIDE_CONFIGURATION: 503 newVal = val & 0xB; 504 break; 505 default: 506 break; 507 } 508 regs[reg] = newVal; 509 return; 510} 511 512 513X86ISA::Interrupts::Interrupts(Params * p) : 514 BasicPioDevice(p), IntDev(this), latency(p->pio_latency), clock(0), 515 apicTimerEvent(this), 516 pendingSmi(false), smiVector(0), 517 pendingNmi(false), nmiVector(0), 518 pendingExtInt(false), extIntVector(0), 519 pendingInit(false), initVector(0), 520 pendingUnmaskableInt(false) 521{ 522 pioSize = PageBytes; 523 memset(regs, 0, sizeof(regs)); 524 //Set the local apic DFR to the flat model. 525 regs[APIC_DESTINATION_FORMAT] = (uint32_t)(-1); 526 ISRV = 0; 527 IRRV = 0; 528} 529 530 531bool 532X86ISA::Interrupts::checkInterrupts(ThreadContext *tc) const 533{ 534 RFLAGS rflags = tc->readMiscRegNoEffect(MISCREG_RFLAGS); 535 if (pendingUnmaskableInt) { 536 DPRINTF(LocalApic, "Reported pending unmaskable interrupt.\n"); 537 return true; 538 } 539 if (rflags.intf) { 540 if (pendingExtInt) { 541 DPRINTF(LocalApic, "Reported pending external interrupt.\n"); 542 return true; 543 } 544 if (IRRV > ISRV && bits(IRRV, 7, 4) > 545 bits(regs[APIC_TASK_PRIORITY], 7, 4)) { 546 DPRINTF(LocalApic, "Reported pending regular interrupt.\n"); 547 return true; 548 } 549 } 550 return false; 551} 552 553Fault 554X86ISA::Interrupts::getInterrupt(ThreadContext *tc) 555{ 556 assert(checkInterrupts(tc)); 557 // These are all probably fairly uncommon, so we'll make them easier to 558 // check for. 559 if (pendingUnmaskableInt) { 560 if (pendingSmi) { 561 DPRINTF(LocalApic, "Generated SMI fault object.\n"); 562 return new SystemManagementInterrupt(); 563 } else if (pendingNmi) { 564 DPRINTF(LocalApic, "Generated NMI fault object.\n"); 565 return new NonMaskableInterrupt(nmiVector); 566 } else if (pendingInit) { 567 DPRINTF(LocalApic, "Generated INIT fault object.\n"); 568 return new InitInterrupt(initVector); 569 } else { 570 panic("pendingUnmaskableInt set, but no unmaskable " 571 "ints were pending.\n"); 572 return NoFault; 573 } 574 } else if (pendingExtInt) { 575 DPRINTF(LocalApic, "Generated external interrupt fault object.\n"); 576 return new ExternalInterrupt(extIntVector); 577 } else { 578 DPRINTF(LocalApic, "Generated regular interrupt fault object.\n"); 579 // The only thing left are fixed and lowest priority interrupts. 580 return new ExternalInterrupt(IRRV); 581 } 582} 583 584void 585X86ISA::Interrupts::updateIntrInfo(ThreadContext *tc) 586{ 587 assert(checkInterrupts(tc)); 588 if (pendingUnmaskableInt) { 589 if (pendingSmi) { 590 DPRINTF(LocalApic, "SMI sent to core.\n"); 591 pendingSmi = false; 592 } else if (pendingNmi) { 593 DPRINTF(LocalApic, "NMI sent to core.\n"); 594 pendingNmi = false; 595 } else if (pendingInit) { 596 DPRINTF(LocalApic, "Init sent to core.\n"); 597 pendingInit = false; 598 } 599 if (!(pendingSmi || pendingNmi || pendingInit)) 600 pendingUnmaskableInt = false; 601 } else if (pendingExtInt) { 602 pendingExtInt = false; 603 } else { 604 DPRINTF(LocalApic, "Interrupt %d sent to core.\n", IRRV); 605 // Mark the interrupt as "in service". 606 ISRV = IRRV; 607 setRegArrayBit(APIC_IN_SERVICE_BASE, ISRV); 608 // Clear it out of the IRR. 609 clearRegArrayBit(APIC_INTERRUPT_REQUEST_BASE, IRRV); 610 updateIRRV(); 611 } 612} 613 614X86ISA::Interrupts * 615X86LocalApicParams::create() 616{ 617 return new X86ISA::Interrupts(this); 618} 619