interrupts.cc revision 10542:7be879ff600c 
1/*
2 * Copyright (c) 2012-2013 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2008 The Hewlett-Packard Development Company
15 * All rights reserved.
16 *
17 * The license below extends only to copyright in the software and shall
18 * not be construed as granting a license to any other intellectual
19 * property including but not limited to intellectual property relating
20 * to a hardware implementation of the functionality of the software
21 * licensed hereunder.  You may use the software subject to the license
22 * terms below provided that you ensure that this notice is replicated
23 * unmodified and in its entirety in all distributions of the software,
24 * modified or unmodified, in source code or in binary form.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions are
28 * met: redistributions of source code must retain the above copyright
29 * notice, this list of conditions and the following disclaimer;
30 * redistributions in binary form must reproduce the above copyright
31 * notice, this list of conditions and the following disclaimer in the
32 * documentation and/or other materials provided with the distribution;
33 * neither the name of the copyright holders nor the names of its
34 * contributors may be used to endorse or promote products derived from
35 * this software without specific prior written permission.
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
38 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
39 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
40 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
41 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
44 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
45 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 *
49 * Authors: Gabe Black
50 */
51
52#include <memory>
53
54#include "arch/x86/regs/apic.hh"
55#include "arch/x86/interrupts.hh"
56#include "arch/x86/intmessage.hh"
57#include "cpu/base.hh"
58#include "debug/LocalApic.hh"
59#include "dev/x86/i82094aa.hh"
60#include "dev/x86/pc.hh"
61#include "dev/x86/south_bridge.hh"
62#include "mem/packet_access.hh"
63#include "sim/system.hh"
64#include "sim/full_system.hh"
65
66int
67divideFromConf(uint32_t conf)
68{
69    // This figures out what division we want from the division configuration
70    // register in the local APIC. The encoding is a little odd but it can
71    // be deciphered fairly easily.
72    int shift = ((conf & 0x8) >> 1) | (conf & 0x3);
73    shift = (shift + 1) % 8;
74    return 1 << shift;
75}
76
77namespace X86ISA
78{
79
80ApicRegIndex
81decodeAddr(Addr paddr)
82{
83    ApicRegIndex regNum;
84    paddr &= ~mask(3);
85    switch (paddr)
86    {
87      case 0x20:
88        regNum = APIC_ID;
89        break;
90      case 0x30:
91        regNum = APIC_VERSION;
92        break;
93      case 0x80:
94        regNum = APIC_TASK_PRIORITY;
95        break;
96      case 0x90:
97        regNum = APIC_ARBITRATION_PRIORITY;
98        break;
99      case 0xA0:
100        regNum = APIC_PROCESSOR_PRIORITY;
101        break;
102      case 0xB0:
103        regNum = APIC_EOI;
104        break;
105      case 0xD0:
106        regNum = APIC_LOGICAL_DESTINATION;
107        break;
108      case 0xE0:
109        regNum = APIC_DESTINATION_FORMAT;
110        break;
111      case 0xF0:
112        regNum = APIC_SPURIOUS_INTERRUPT_VECTOR;
113        break;
114      case 0x100:
115      case 0x108:
116      case 0x110:
117      case 0x118:
118      case 0x120:
119      case 0x128:
120      case 0x130:
121      case 0x138:
122      case 0x140:
123      case 0x148:
124      case 0x150:
125      case 0x158:
126      case 0x160:
127      case 0x168:
128      case 0x170:
129      case 0x178:
130        regNum = APIC_IN_SERVICE((paddr - 0x100) / 0x8);
131        break;
132      case 0x180:
133      case 0x188:
134      case 0x190:
135      case 0x198:
136      case 0x1A0:
137      case 0x1A8:
138      case 0x1B0:
139      case 0x1B8:
140      case 0x1C0:
141      case 0x1C8:
142      case 0x1D0:
143      case 0x1D8:
144      case 0x1E0:
145      case 0x1E8:
146      case 0x1F0:
147      case 0x1F8:
148        regNum = APIC_TRIGGER_MODE((paddr - 0x180) / 0x8);
149        break;
150      case 0x200:
151      case 0x208:
152      case 0x210:
153      case 0x218:
154      case 0x220:
155      case 0x228:
156      case 0x230:
157      case 0x238:
158      case 0x240:
159      case 0x248:
160      case 0x250:
161      case 0x258:
162      case 0x260:
163      case 0x268:
164      case 0x270:
165      case 0x278:
166        regNum = APIC_INTERRUPT_REQUEST((paddr - 0x200) / 0x8);
167        break;
168      case 0x280:
169        regNum = APIC_ERROR_STATUS;
170        break;
171      case 0x300:
172        regNum = APIC_INTERRUPT_COMMAND_LOW;
173        break;
174      case 0x310:
175        regNum = APIC_INTERRUPT_COMMAND_HIGH;
176        break;
177      case 0x320:
178        regNum = APIC_LVT_TIMER;
179        break;
180      case 0x330:
181        regNum = APIC_LVT_THERMAL_SENSOR;
182        break;
183      case 0x340:
184        regNum = APIC_LVT_PERFORMANCE_MONITORING_COUNTERS;
185        break;
186      case 0x350:
187        regNum = APIC_LVT_LINT0;
188        break;
189      case 0x360:
190        regNum = APIC_LVT_LINT1;
191        break;
192      case 0x370:
193        regNum = APIC_LVT_ERROR;
194        break;
195      case 0x380:
196        regNum = APIC_INITIAL_COUNT;
197        break;
198      case 0x390:
199        regNum = APIC_CURRENT_COUNT;
200        break;
201      case 0x3E0:
202        regNum = APIC_DIVIDE_CONFIGURATION;
203        break;
204      default:
205        // A reserved register field.
206        panic("Accessed reserved register field %#x.\n", paddr);
207        break;
208    }
209    return regNum;
210}
211}
212
213Tick
214X86ISA::Interrupts::read(PacketPtr pkt)
215{
216    Addr offset = pkt->getAddr() - pioAddr;
217    //Make sure we're at least only accessing one register.
218    if ((offset & ~mask(3)) != ((offset + pkt->getSize()) & ~mask(3)))
219        panic("Accessed more than one register at a time in the APIC!\n");
220    ApicRegIndex reg = decodeAddr(offset);
221    uint32_t val = htog(readReg(reg));
222    DPRINTF(LocalApic,
223            "Reading Local APIC register %d at offset %#x as %#x.\n",
224            reg, offset, val);
225    pkt->setData(((uint8_t *)&val) + (offset & mask(3)));
226    pkt->makeAtomicResponse();
227    return pioDelay;
228}
229
230Tick
231X86ISA::Interrupts::write(PacketPtr pkt)
232{
233    Addr offset = pkt->getAddr() - pioAddr;
234    //Make sure we're at least only accessing one register.
235    if ((offset & ~mask(3)) != ((offset + pkt->getSize()) & ~mask(3)))
236        panic("Accessed more than one register at a time in the APIC!\n");
237    ApicRegIndex reg = decodeAddr(offset);
238    uint32_t val = regs[reg];
239    pkt->writeData(((uint8_t *)&val) + (offset & mask(3)));
240    DPRINTF(LocalApic,
241            "Writing Local APIC register %d at offset %#x as %#x.\n",
242            reg, offset, gtoh(val));
243    setReg(reg, gtoh(val));
244    pkt->makeAtomicResponse();
245    return pioDelay;
246}
247void
248X86ISA::Interrupts::requestInterrupt(uint8_t vector,
249        uint8_t deliveryMode, bool level)
250{
251    /*
252     * Fixed and lowest-priority delivery mode interrupts are handled
253     * using the IRR/ISR registers, checking against the TPR, etc.
254     * The SMI, NMI, ExtInt, INIT, etc interrupts go straight through.
255     */
256    if (deliveryMode == DeliveryMode::Fixed ||
257            deliveryMode == DeliveryMode::LowestPriority) {
258        DPRINTF(LocalApic, "Interrupt is an %s.\n",
259                DeliveryMode::names[deliveryMode]);
260        // Queue up the interrupt in the IRR.
261        if (vector > IRRV)
262            IRRV = vector;
263        if (!getRegArrayBit(APIC_INTERRUPT_REQUEST_BASE, vector)) {
264            setRegArrayBit(APIC_INTERRUPT_REQUEST_BASE, vector);
265            if (level) {
266                setRegArrayBit(APIC_TRIGGER_MODE_BASE, vector);
267            } else {
268                clearRegArrayBit(APIC_TRIGGER_MODE_BASE, vector);
269            }
270        }
271    } else if (!DeliveryMode::isReserved(deliveryMode)) {
272        DPRINTF(LocalApic, "Interrupt is an %s.\n",
273                DeliveryMode::names[deliveryMode]);
274        if (deliveryMode == DeliveryMode::SMI && !pendingSmi) {
275            pendingUnmaskableInt = pendingSmi = true;
276            smiVector = vector;
277        } else if (deliveryMode == DeliveryMode::NMI && !pendingNmi) {
278            pendingUnmaskableInt = pendingNmi = true;
279            nmiVector = vector;
280        } else if (deliveryMode == DeliveryMode::ExtInt && !pendingExtInt) {
281            pendingExtInt = true;
282            extIntVector = vector;
283        } else if (deliveryMode == DeliveryMode::INIT && !pendingInit) {
284            pendingUnmaskableInt = pendingInit = true;
285            initVector = vector;
286        } else if (deliveryMode == DeliveryMode::SIPI &&
287                !pendingStartup && !startedUp) {
288            pendingUnmaskableInt = pendingStartup = true;
289            startupVector = vector;
290        }
291    }
292    if (FullSystem)
293        cpu->wakeup();
294}
295
296
297void
298X86ISA::Interrupts::setCPU(BaseCPU * newCPU)
299{
300    assert(newCPU);
301    if (cpu != NULL && cpu->cpuId() != newCPU->cpuId()) {
302        panic("Local APICs can't be moved between CPUs"
303                " with different IDs.\n");
304    }
305    cpu = newCPU;
306    initialApicId = cpu->cpuId();
307    regs[APIC_ID] = (initialApicId << 24);
308    pioAddr = x86LocalAPICAddress(initialApicId, 0);
309}
310
311
312void
313X86ISA::Interrupts::init()
314{
315    //
316    // The local apic must register its address ranges on both its pio
317    // port via the basicpiodevice(piodevice) init() function and its
318    // int port that it inherited from IntDevice.  Note IntDevice is
319    // not a SimObject itself.
320    //
321    BasicPioDevice::init();
322    IntDevice::init();
323
324    // the slave port has a range so inform the connected master
325    intSlavePort.sendRangeChange();
326}
327
328
329Tick
330X86ISA::Interrupts::recvMessage(PacketPtr pkt)
331{
332    Addr offset = pkt->getAddr() - x86InterruptAddress(initialApicId, 0);
333    assert(pkt->cmd == MemCmd::MessageReq);
334    switch(offset)
335    {
336      case 0:
337        {
338            TriggerIntMessage message = pkt->get<TriggerIntMessage>();
339            DPRINTF(LocalApic,
340                    "Got Trigger Interrupt message with vector %#x.\n",
341                    message.vector);
342
343            requestInterrupt(message.vector,
344                    message.deliveryMode, message.trigger);
345        }
346        break;
347      default:
348        panic("Local apic got unknown interrupt message at offset %#x.\n",
349                offset);
350        break;
351    }
352    pkt->makeAtomicResponse();
353    return pioDelay;
354}
355
356
357Tick
358X86ISA::Interrupts::recvResponse(PacketPtr pkt)
359{
360    assert(!pkt->isError());
361    assert(pkt->cmd == MemCmd::MessageResp);
362    if (--pendingIPIs == 0) {
363        InterruptCommandRegLow low = regs[APIC_INTERRUPT_COMMAND_LOW];
364        // Record that the ICR is now idle.
365        low.deliveryStatus = 0;
366        regs[APIC_INTERRUPT_COMMAND_LOW] = low;
367    }
368    DPRINTF(LocalApic, "ICR is now idle.\n");
369    return 0;
370}
371
372
373AddrRangeList
374X86ISA::Interrupts::getIntAddrRange() const
375{
376    AddrRangeList ranges;
377    ranges.push_back(RangeEx(x86InterruptAddress(initialApicId, 0),
378                             x86InterruptAddress(initialApicId, 0) +
379                             PhysAddrAPICRangeSize));
380    return ranges;
381}
382
383
384uint32_t
385X86ISA::Interrupts::readReg(ApicRegIndex reg)
386{
387    if (reg >= APIC_TRIGGER_MODE(0) &&
388            reg <= APIC_TRIGGER_MODE(15)) {
389        panic("Local APIC Trigger Mode registers are unimplemented.\n");
390    }
391    switch (reg) {
392      case APIC_ARBITRATION_PRIORITY:
393        panic("Local APIC Arbitration Priority register unimplemented.\n");
394        break;
395      case APIC_PROCESSOR_PRIORITY:
396        panic("Local APIC Processor Priority register unimplemented.\n");
397        break;
398      case APIC_ERROR_STATUS:
399        regs[APIC_INTERNAL_STATE] &= ~ULL(0x1);
400        break;
401      case APIC_CURRENT_COUNT:
402        {
403            if (apicTimerEvent.scheduled()) {
404                // Compute how many m5 ticks happen per count.
405                uint64_t ticksPerCount = clockPeriod() *
406                    divideFromConf(regs[APIC_DIVIDE_CONFIGURATION]);
407                // Compute how many m5 ticks are left.
408                uint64_t val = apicTimerEvent.when() - curTick();
409                // Turn that into a count.
410                val = (val + ticksPerCount - 1) / ticksPerCount;
411                return val;
412            } else {
413                return 0;
414            }
415        }
416      default:
417        break;
418    }
419    return regs[reg];
420}
421
422void
423X86ISA::Interrupts::setReg(ApicRegIndex reg, uint32_t val)
424{
425    uint32_t newVal = val;
426    if (reg >= APIC_IN_SERVICE(0) &&
427            reg <= APIC_IN_SERVICE(15)) {
428        panic("Local APIC In-Service registers are unimplemented.\n");
429    }
430    if (reg >= APIC_TRIGGER_MODE(0) &&
431            reg <= APIC_TRIGGER_MODE(15)) {
432        panic("Local APIC Trigger Mode registers are unimplemented.\n");
433    }
434    if (reg >= APIC_INTERRUPT_REQUEST(0) &&
435            reg <= APIC_INTERRUPT_REQUEST(15)) {
436        panic("Local APIC Interrupt Request registers "
437                "are unimplemented.\n");
438    }
439    switch (reg) {
440      case APIC_ID:
441        newVal = val & 0xFF;
442        break;
443      case APIC_VERSION:
444        // The Local APIC Version register is read only.
445        return;
446      case APIC_TASK_PRIORITY:
447        newVal = val & 0xFF;
448        break;
449      case APIC_ARBITRATION_PRIORITY:
450        panic("Local APIC Arbitration Priority register unimplemented.\n");
451        break;
452      case APIC_PROCESSOR_PRIORITY:
453        panic("Local APIC Processor Priority register unimplemented.\n");
454        break;
455      case APIC_EOI:
456        // Remove the interrupt that just completed from the local apic state.
457        clearRegArrayBit(APIC_IN_SERVICE_BASE, ISRV);
458        updateISRV();
459        return;
460      case APIC_LOGICAL_DESTINATION:
461        newVal = val & 0xFF000000;
462        break;
463      case APIC_DESTINATION_FORMAT:
464        newVal = val | 0x0FFFFFFF;
465        break;
466      case APIC_SPURIOUS_INTERRUPT_VECTOR:
467        regs[APIC_INTERNAL_STATE] &= ~ULL(1 << 1);
468        regs[APIC_INTERNAL_STATE] |= val & (1 << 8);
469        if (val & (1 << 9))
470            warn("Focus processor checking not implemented.\n");
471        break;
472      case APIC_ERROR_STATUS:
473        {
474            if (regs[APIC_INTERNAL_STATE] & 0x1) {
475                regs[APIC_INTERNAL_STATE] &= ~ULL(0x1);
476                newVal = 0;
477            } else {
478                regs[APIC_INTERNAL_STATE] |= ULL(0x1);
479                return;
480            }
481
482        }
483        break;
484      case APIC_INTERRUPT_COMMAND_LOW:
485        {
486            InterruptCommandRegLow low = regs[APIC_INTERRUPT_COMMAND_LOW];
487            // Check if we're already sending an IPI.
488            if (low.deliveryStatus) {
489                newVal = low;
490                break;
491            }
492            low = val;
493            InterruptCommandRegHigh high = regs[APIC_INTERRUPT_COMMAND_HIGH];
494            TriggerIntMessage message = 0;
495            message.destination = high.destination;
496            message.vector = low.vector;
497            message.deliveryMode = low.deliveryMode;
498            message.destMode = low.destMode;
499            message.level = low.level;
500            message.trigger = low.trigger;
501            ApicList apics;
502            int numContexts = sys->numContexts();
503            switch (low.destShorthand) {
504              case 0:
505                if (message.deliveryMode == DeliveryMode::LowestPriority) {
506                    panic("Lowest priority delivery mode "
507                            "IPIs aren't implemented.\n");
508                }
509                if (message.destMode == 1) {
510                    int dest = message.destination;
511                    hack_once("Assuming logical destinations are 1 << id.\n");
512                    for (int i = 0; i < numContexts; i++) {
513                        if (dest & 0x1)
514                            apics.push_back(i);
515                        dest = dest >> 1;
516                    }
517                } else {
518                    if (message.destination == 0xFF) {
519                        for (int i = 0; i < numContexts; i++) {
520                            if (i == initialApicId) {
521                                requestInterrupt(message.vector,
522                                        message.deliveryMode, message.trigger);
523                            } else {
524                                apics.push_back(i);
525                            }
526                        }
527                    } else {
528                        if (message.destination == initialApicId) {
529                            requestInterrupt(message.vector,
530                                    message.deliveryMode, message.trigger);
531                        } else {
532                            apics.push_back(message.destination);
533                        }
534                    }
535                }
536                break;
537              case 1:
538                newVal = val;
539                requestInterrupt(message.vector,
540                        message.deliveryMode, message.trigger);
541                break;
542              case 2:
543                requestInterrupt(message.vector,
544                        message.deliveryMode, message.trigger);
545                // Fall through
546              case 3:
547                {
548                    for (int i = 0; i < numContexts; i++) {
549                        if (i != initialApicId) {
550                            apics.push_back(i);
551                        }
552                    }
553                }
554                break;
555            }
556            // Record that an IPI is being sent if one actually is.
557            if (apics.size()) {
558                low.deliveryStatus = 1;
559                pendingIPIs += apics.size();
560            }
561            regs[APIC_INTERRUPT_COMMAND_LOW] = low;
562            intMasterPort.sendMessage(apics, message, sys->isTimingMode());
563            newVal = regs[APIC_INTERRUPT_COMMAND_LOW];
564        }
565        break;
566      case APIC_LVT_TIMER:
567      case APIC_LVT_THERMAL_SENSOR:
568      case APIC_LVT_PERFORMANCE_MONITORING_COUNTERS:
569      case APIC_LVT_LINT0:
570      case APIC_LVT_LINT1:
571      case APIC_LVT_ERROR:
572        {
573            uint64_t readOnlyMask = (1 << 12) | (1 << 14);
574            newVal = (val & ~readOnlyMask) |
575                     (regs[reg] & readOnlyMask);
576        }
577        break;
578      case APIC_INITIAL_COUNT:
579        {
580            newVal = bits(val, 31, 0);
581            // Compute how many timer ticks we're being programmed for.
582            uint64_t newCount = newVal *
583                (divideFromConf(regs[APIC_DIVIDE_CONFIGURATION]));
584            // Schedule on the edge of the next tick plus the new count.
585            Tick offset = curTick() % clockPeriod();
586            if (offset) {
587                reschedule(apicTimerEvent,
588                           curTick() + (newCount + 1) *
589                           clockPeriod() - offset, true);
590            } else {
591                if (newCount)
592                    reschedule(apicTimerEvent,
593                               curTick() + newCount *
594                               clockPeriod(), true);
595            }
596        }
597        break;
598      case APIC_CURRENT_COUNT:
599        //Local APIC Current Count register is read only.
600        return;
601      case APIC_DIVIDE_CONFIGURATION:
602        newVal = val & 0xB;
603        break;
604      default:
605        break;
606    }
607    regs[reg] = newVal;
608    return;
609}
610
611
612X86ISA::Interrupts::Interrupts(Params * p)
613    : BasicPioDevice(p, PageBytes), IntDevice(this, p->int_latency),
614      apicTimerEvent(this),
615      pendingSmi(false), smiVector(0),
616      pendingNmi(false), nmiVector(0),
617      pendingExtInt(false), extIntVector(0),
618      pendingInit(false), initVector(0),
619      pendingStartup(false), startupVector(0),
620      startedUp(false), pendingUnmaskableInt(false),
621      pendingIPIs(0), cpu(NULL),
622      intSlavePort(name() + ".int_slave", this, this)
623{
624    memset(regs, 0, sizeof(regs));
625    //Set the local apic DFR to the flat model.
626    regs[APIC_DESTINATION_FORMAT] = (uint32_t)(-1);
627    ISRV = 0;
628    IRRV = 0;
629}
630
631
632bool
633X86ISA::Interrupts::checkInterrupts(ThreadContext *tc) const
634{
635    RFLAGS rflags = tc->readMiscRegNoEffect(MISCREG_RFLAGS);
636    if (pendingUnmaskableInt) {
637        DPRINTF(LocalApic, "Reported pending unmaskable interrupt.\n");
638        return true;
639    }
640    if (rflags.intf) {
641        if (pendingExtInt) {
642            DPRINTF(LocalApic, "Reported pending external interrupt.\n");
643            return true;
644        }
645        if (IRRV > ISRV && bits(IRRV, 7, 4) >
646               bits(regs[APIC_TASK_PRIORITY], 7, 4)) {
647            DPRINTF(LocalApic, "Reported pending regular interrupt.\n");
648            return true;
649        }
650    }
651    return false;
652}
653
654bool
655X86ISA::Interrupts::checkInterruptsRaw() const
656{
657    return pendingUnmaskableInt || pendingExtInt ||
658        (IRRV > ISRV && bits(IRRV, 7, 4) >
659         bits(regs[APIC_TASK_PRIORITY], 7, 4));
660}
661
662Fault
663X86ISA::Interrupts::getInterrupt(ThreadContext *tc)
664{
665    assert(checkInterrupts(tc));
666    // These are all probably fairly uncommon, so we'll make them easier to
667    // check for.
668    if (pendingUnmaskableInt) {
669        if (pendingSmi) {
670            DPRINTF(LocalApic, "Generated SMI fault object.\n");
671            return std::make_shared<SystemManagementInterrupt>();
672        } else if (pendingNmi) {
673            DPRINTF(LocalApic, "Generated NMI fault object.\n");
674            return std::make_shared<NonMaskableInterrupt>(nmiVector);
675        } else if (pendingInit) {
676            DPRINTF(LocalApic, "Generated INIT fault object.\n");
677            return std::make_shared<InitInterrupt>(initVector);
678        } else if (pendingStartup) {
679            DPRINTF(LocalApic, "Generating SIPI fault object.\n");
680            return std::make_shared<StartupInterrupt>(startupVector);
681        } else {
682            panic("pendingUnmaskableInt set, but no unmaskable "
683                    "ints were pending.\n");
684            return NoFault;
685        }
686    } else if (pendingExtInt) {
687        DPRINTF(LocalApic, "Generated external interrupt fault object.\n");
688        return std::make_shared<ExternalInterrupt>(extIntVector);
689    } else {
690        DPRINTF(LocalApic, "Generated regular interrupt fault object.\n");
691        // The only thing left are fixed and lowest priority interrupts.
692        return std::make_shared<ExternalInterrupt>(IRRV);
693    }
694}
695
696void
697X86ISA::Interrupts::updateIntrInfo(ThreadContext *tc)
698{
699    assert(checkInterrupts(tc));
700    if (pendingUnmaskableInt) {
701        if (pendingSmi) {
702            DPRINTF(LocalApic, "SMI sent to core.\n");
703            pendingSmi = false;
704        } else if (pendingNmi) {
705            DPRINTF(LocalApic, "NMI sent to core.\n");
706            pendingNmi = false;
707        } else if (pendingInit) {
708            DPRINTF(LocalApic, "Init sent to core.\n");
709            pendingInit = false;
710            startedUp = false;
711        } else if (pendingStartup) {
712            DPRINTF(LocalApic, "SIPI sent to core.\n");
713            pendingStartup = false;
714            startedUp = true;
715        }
716        if (!(pendingSmi || pendingNmi || pendingInit || pendingStartup))
717            pendingUnmaskableInt = false;
718    } else if (pendingExtInt) {
719        pendingExtInt = false;
720    } else {
721        DPRINTF(LocalApic, "Interrupt %d sent to core.\n", IRRV);
722        // Mark the interrupt as "in service".
723        ISRV = IRRV;
724        setRegArrayBit(APIC_IN_SERVICE_BASE, ISRV);
725        // Clear it out of the IRR.
726        clearRegArrayBit(APIC_INTERRUPT_REQUEST_BASE, IRRV);
727        updateIRRV();
728    }
729}
730
731void
732X86ISA::Interrupts::serialize(std::ostream &os)
733{
734    SERIALIZE_ARRAY(regs, NUM_APIC_REGS);
735    SERIALIZE_SCALAR(pendingSmi);
736    SERIALIZE_SCALAR(smiVector);
737    SERIALIZE_SCALAR(pendingNmi);
738    SERIALIZE_SCALAR(nmiVector);
739    SERIALIZE_SCALAR(pendingExtInt);
740    SERIALIZE_SCALAR(extIntVector);
741    SERIALIZE_SCALAR(pendingInit);
742    SERIALIZE_SCALAR(initVector);
743    SERIALIZE_SCALAR(pendingStartup);
744    SERIALIZE_SCALAR(startupVector);
745    SERIALIZE_SCALAR(startedUp);
746    SERIALIZE_SCALAR(pendingUnmaskableInt);
747    SERIALIZE_SCALAR(pendingIPIs);
748    SERIALIZE_SCALAR(IRRV);
749    SERIALIZE_SCALAR(ISRV);
750    bool apicTimerEventScheduled = apicTimerEvent.scheduled();
751    SERIALIZE_SCALAR(apicTimerEventScheduled);
752    Tick apicTimerEventTick = apicTimerEvent.when();
753    SERIALIZE_SCALAR(apicTimerEventTick);
754}
755
756void
757X86ISA::Interrupts::unserialize(Checkpoint *cp, const std::string &section)
758{
759    UNSERIALIZE_ARRAY(regs, NUM_APIC_REGS);
760    UNSERIALIZE_SCALAR(pendingSmi);
761    UNSERIALIZE_SCALAR(smiVector);
762    UNSERIALIZE_SCALAR(pendingNmi);
763    UNSERIALIZE_SCALAR(nmiVector);
764    UNSERIALIZE_SCALAR(pendingExtInt);
765    UNSERIALIZE_SCALAR(extIntVector);
766    UNSERIALIZE_SCALAR(pendingInit);
767    UNSERIALIZE_SCALAR(initVector);
768    UNSERIALIZE_SCALAR(pendingStartup);
769    UNSERIALIZE_SCALAR(startupVector);
770    UNSERIALIZE_SCALAR(startedUp);
771    UNSERIALIZE_SCALAR(pendingUnmaskableInt);
772    UNSERIALIZE_SCALAR(pendingIPIs);
773    UNSERIALIZE_SCALAR(IRRV);
774    UNSERIALIZE_SCALAR(ISRV);
775    bool apicTimerEventScheduled;
776    UNSERIALIZE_SCALAR(apicTimerEventScheduled);
777    if (apicTimerEventScheduled) {
778        Tick apicTimerEventTick;
779        UNSERIALIZE_SCALAR(apicTimerEventTick);
780        if (apicTimerEvent.scheduled()) {
781            reschedule(apicTimerEvent, apicTimerEventTick, true);
782        } else {
783            schedule(apicTimerEvent, apicTimerEventTick);
784        }
785    }
786}
787
788X86ISA::Interrupts *
789X86LocalApicParams::create()
790{
791    return new X86ISA::Interrupts(this);
792}
793