hw/apic.c

   1 /*
   2  *  APIC support
   3  *
   4  *  Copyright (c) 2004-2005 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  18  */
  19 #include "qemu/thread.h"
  20 #include "hw/apic_internal.h"
  21 #include "hw/apic.h"
  22 #include "hw/ioapic.h"
  23 #include "hw/pci/msi.h"
  24 #include "qemu/host-utils.h"
  25 #include "trace.h"
  26 #include "hw/pc.h"
  27 #include "hw/apic-msidef.h"
  28
  29 #define MAX_APIC_WORDS 8
  30
  31 #define SYNC_FROM_VAPIC                 0x1
  32 #define SYNC_TO_VAPIC                   0x2
  33 #define SYNC_ISR_IRR_TO_VAPIC           0x4
  34
  35 static APICCommonState *local_apics[MAX_APICS + 1];
  36
  37 static void apic_set_irq(APICCommonState *s, int vector_num, int trigger_mode);
  38 static void apic_update_irq(APICCommonState *s);
  39 static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
  40                                       uint8_t dest, uint8_t dest_mode);
  41
  42 /* Find first bit starting from msb */
  43 static int fls_bit(uint32_t value)
  44 {
  45     return 31 - clz32(value);
  46 }
  47
  48 /* Find first bit starting from lsb */
  49 static int ffs_bit(uint32_t value)
  50 {
  51     return ctz32(value);
  52 }
  53
  54 static inline void set_bit(uint32_t *tab, int index)
  55 {
  56     int i, mask;
  57     i = index >> 5;
  58     mask = 1 << (index & 0x1f);
  59     tab[i] |= mask;
  60 }
  61
  62 static inline void reset_bit(uint32_t *tab, int index)
  63 {
  64     int i, mask;
  65     i = index >> 5;
  66     mask = 1 << (index & 0x1f);
  67     tab[i] &= ~mask;
  68 }
  69
  70 static inline int get_bit(uint32_t *tab, int index)
  71 {
  72     int i, mask;
  73     i = index >> 5;
  74     mask = 1 << (index & 0x1f);
  75     return !!(tab[i] & mask);
  76 }
  77
  78 /* return -1 if no bit is set */
  79 static int get_highest_priority_int(uint32_t *tab)
  80 {
  81     int i;
  82     for (i = 7; i >= 0; i--) {
  83         if (tab[i] != 0) {
  84             return i * 32 + fls_bit(tab[i]);
  85         }
  86     }
  87     return -1;
  88 }
  89
  90 static void apic_sync_vapic(APICCommonState *s, int sync_type)
  91 {
  92     VAPICState vapic_state;
  93     size_t length;
  94     off_t start;
  95     int vector;
  96
  97     if (!s->vapic_paddr) {
  98         return;
  99     }
 100     if (sync_type & SYNC_FROM_VAPIC) {
 101         cpu_physical_memory_rw(s->vapic_paddr, (void *)&vapic_state,
 102                                sizeof(vapic_state), 0);
 103         s->tpr = vapic_state.tpr;
 104     }
 105     if (sync_type & (SYNC_TO_VAPIC | SYNC_ISR_IRR_TO_VAPIC)) {
 106         start = offsetof(VAPICState, isr);
 107         length = offsetof(VAPICState, enabled) - offsetof(VAPICState, isr);
 108
 109         if (sync_type & SYNC_TO_VAPIC) {
 110             assert(qemu_cpu_is_self(CPU(s->cpu)));
 111
 112             vapic_state.tpr = s->tpr;
 113             vapic_state.enabled = 1;
 114             start = 0;
 115             length = sizeof(VAPICState);
 116         }
 117
 118         vector = get_highest_priority_int(s->isr);
 119         if (vector < 0) {
 120             vector = 0;
 121         }
 122         vapic_state.isr = vector & 0xf0;
 123
 124         vapic_state.zero = 0;
 125
 126         vector = get_highest_priority_int(s->irr);
 127         if (vector < 0) {
 128             vector = 0;
 129         }
 130         vapic_state.irr = vector & 0xff;
 131
 132         cpu_physical_memory_write_rom(s->vapic_paddr + start,
 133                                       ((void *)&vapic_state) + start, length);
 134     }
 135 }
 136
 137 static void apic_vapic_base_update(APICCommonState *s)
 138 {
 139     apic_sync_vapic(s, SYNC_TO_VAPIC);
 140 }
 141
 142 static void apic_local_deliver(APICCommonState *s, int vector)
 143 {
 144     uint32_t lvt = s->lvt[vector];
 145     int trigger_mode;
 146
 147     trace_apic_local_deliver(vector, (lvt >> 8) & 7);
 148
 149     if (lvt & APIC_LVT_MASKED)
 150         return;
 151
 152     switch ((lvt >> 8) & 7) {
 153     case APIC_DM_SMI:
 154         cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_SMI);
 155         break;
 156
 157     case APIC_DM_NMI:
 158         cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_NMI);
 159         break;
 160
 161     case APIC_DM_EXTINT:
 162         cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_HARD);
 163         break;
 164
 165     case APIC_DM_FIXED:
 166         trigger_mode = APIC_TRIGGER_EDGE;
 167         if ((vector == APIC_LVT_LINT0 || vector == APIC_LVT_LINT1) &&
 168             (lvt & APIC_LVT_LEVEL_TRIGGER))
 169             trigger_mode = APIC_TRIGGER_LEVEL;
 170         apic_set_irq(s, lvt & 0xff, trigger_mode);
 171     }
 172 }
 173
 174 void apic_deliver_pic_intr(DeviceState *d, int level)
 175 {
 176     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 177
 178     if (level) {
 179         apic_local_deliver(s, APIC_LVT_LINT0);
 180     } else {
 181         uint32_t lvt = s->lvt[APIC_LVT_LINT0];
 182
 183         switch ((lvt >> 8) & 7) {
 184         case APIC_DM_FIXED:
 185             if (!(lvt & APIC_LVT_LEVEL_TRIGGER))
 186                 break;
 187             reset_bit(s->irr, lvt & 0xff);
 188             /* fall through */
 189         case APIC_DM_EXTINT:
 190             cpu_reset_interrupt(&s->cpu->env, CPU_INTERRUPT_HARD);
 191             break;
 192         }
 193     }
 194 }
 195
 196 static void apic_external_nmi(APICCommonState *s)
 197 {
 198     apic_local_deliver(s, APIC_LVT_LINT1);
 199 }
 200
 201 #define foreach_apic(apic, deliver_bitmask, code) \
 202 {\
 203     int __i, __j, __mask;\
 204     for(__i = 0; __i < MAX_APIC_WORDS; __i++) {\
 205         __mask = deliver_bitmask[__i];\
 206         if (__mask) {\
 207             for(__j = 0; __j < 32; __j++) {\
 208                 if (__mask & (1 << __j)) {\
 209                     apic = local_apics[__i * 32 + __j];\
 210                     if (apic) {\
 211                         code;\
 212                     }\
 213                 }\
 214             }\
 215         }\
 216     }\
 217 }
 218
 219 static void apic_bus_deliver(const uint32_t *deliver_bitmask,
 220                              uint8_t delivery_mode, uint8_t vector_num,
 221                              uint8_t trigger_mode)
 222 {
 223     APICCommonState *apic_iter;
 224
 225     switch (delivery_mode) {
 226         case APIC_DM_LOWPRI:
 227             /* XXX: search for focus processor, arbitration */
 228             {
 229                 int i, d;
 230                 d = -1;
 231                 for(i = 0; i < MAX_APIC_WORDS; i++) {
 232                     if (deliver_bitmask[i]) {
 233                         d = i * 32 + ffs_bit(deliver_bitmask[i]);
 234                         break;
 235                     }
 236                 }
 237                 if (d >= 0) {
 238                     apic_iter = local_apics[d];
 239                     if (apic_iter) {
 240                         apic_set_irq(apic_iter, vector_num, trigger_mode);
 241                     }
 242                 }
 243             }
 244             return;
 245
 246         case APIC_DM_FIXED:
 247             break;
 248
 249         case APIC_DM_SMI:
 250             foreach_apic(apic_iter, deliver_bitmask,
 251                 cpu_interrupt(&apic_iter->cpu->env, CPU_INTERRUPT_SMI)
 252             );
 253             return;
 254
 255         case APIC_DM_NMI:
 256             foreach_apic(apic_iter, deliver_bitmask,
 257                 cpu_interrupt(&apic_iter->cpu->env, CPU_INTERRUPT_NMI)
 258             );
 259             return;
 260
 261         case APIC_DM_INIT:
 262             /* normal INIT IPI sent to processors */
 263             foreach_apic(apic_iter, deliver_bitmask,
 264                          cpu_interrupt(&apic_iter->cpu->env,
 265                                        CPU_INTERRUPT_INIT)
 266             );
 267             return;
 268
 269         case APIC_DM_EXTINT:
 270             /* handled in I/O APIC code */
 271             break;
 272
 273         default:
 274             return;
 275     }
 276
 277     foreach_apic(apic_iter, deliver_bitmask,
 278                  apic_set_irq(apic_iter, vector_num, trigger_mode) );
 279 }
 280
 281 void apic_deliver_irq(uint8_t dest, uint8_t dest_mode, uint8_t delivery_mode,
 282                       uint8_t vector_num, uint8_t trigger_mode)
 283 {
 284     uint32_t deliver_bitmask[MAX_APIC_WORDS];
 285
 286     trace_apic_deliver_irq(dest, dest_mode, delivery_mode, vector_num,
 287                            trigger_mode);
 288
 289     apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
 290     apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, trigger_mode);
 291 }
 292
 293 static void apic_set_base(APICCommonState *s, uint64_t val)
 294 {
 295     s->apicbase = (val & 0xfffff000) |
 296         (s->apicbase & (MSR_IA32_APICBASE_BSP | MSR_IA32_APICBASE_ENABLE));
 297     /* if disabled, cannot be enabled again */
 298     if (!(val & MSR_IA32_APICBASE_ENABLE)) {
 299         s->apicbase &= ~MSR_IA32_APICBASE_ENABLE;
 300         cpu_clear_apic_feature(&s->cpu->env);
 301         s->spurious_vec &= ~APIC_SV_ENABLE;
 302     }
 303 }
 304
 305 static void apic_set_tpr(APICCommonState *s, uint8_t val)
 306 {
 307     /* Updates from cr8 are ignored while the VAPIC is active */
 308     if (!s->vapic_paddr) {
 309         s->tpr = val << 4;
 310         apic_update_irq(s);
 311     }
 312 }
 313
 314 static uint8_t apic_get_tpr(APICCommonState *s)
 315 {
 316     apic_sync_vapic(s, SYNC_FROM_VAPIC);
 317     return s->tpr >> 4;
 318 }
 319
 320 static int apic_get_ppr(APICCommonState *s)
 321 {
 322     int tpr, isrv, ppr;
 323
 324     tpr = (s->tpr >> 4);
 325     isrv = get_highest_priority_int(s->isr);
 326     if (isrv < 0)
 327         isrv = 0;
 328     isrv >>= 4;
 329     if (tpr >= isrv)
 330         ppr = s->tpr;
 331     else
 332         ppr = isrv << 4;
 333     return ppr;
 334 }
 335
 336 static int apic_get_arb_pri(APICCommonState *s)
 337 {
 338     /* XXX: arbitration */
 339     return 0;
 340 }
 341
 342
 343 /*
 344  * <0 - low prio interrupt,
 345  * 0  - no interrupt,
 346  * >0 - interrupt number
 347  */
 348 static int apic_irq_pending(APICCommonState *s)
 349 {
 350     int irrv, ppr;
 351     irrv = get_highest_priority_int(s->irr);
 352     if (irrv < 0) {
 353         return 0;
 354     }
 355     ppr = apic_get_ppr(s);
 356     if (ppr && (irrv & 0xf0) <= (ppr & 0xf0)) {
 357         return -1;
 358     }
 359
 360     return irrv;
 361 }
 362
 363 /* signal the CPU if an irq is pending */
 364 static void apic_update_irq(APICCommonState *s)
 365 {
 366     CPUState *cpu = CPU(s->cpu);
 367
 368     if (!(s->spurious_vec & APIC_SV_ENABLE)) {
 369         return;
 370     }
 371     if (!qemu_cpu_is_self(cpu)) {
 372         cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_POLL);
 373     } else if (apic_irq_pending(s) > 0) {
 374         cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_HARD);
 375     }
 376 }
 377
 378 void apic_poll_irq(DeviceState *d)
 379 {
 380     APICCommonState *s = APIC_COMMON(d);
 381
 382     apic_sync_vapic(s, SYNC_FROM_VAPIC);
 383     apic_update_irq(s);
 384 }
 385
 386 static void apic_set_irq(APICCommonState *s, int vector_num, int trigger_mode)
 387 {
 388     apic_report_irq_delivered(!get_bit(s->irr, vector_num));
 389
 390     set_bit(s->irr, vector_num);
 391     if (trigger_mode)
 392         set_bit(s->tmr, vector_num);
 393     else
 394         reset_bit(s->tmr, vector_num);
 395     if (s->vapic_paddr) {
 396         apic_sync_vapic(s, SYNC_ISR_IRR_TO_VAPIC);
 397         /*
 398          * The vcpu thread needs to see the new IRR before we pull its current
 399          * TPR value. That way, if we miss a lowering of the TRP, the guest
 400          * has the chance to notice the new IRR and poll for IRQs on its own.
 401          */
 402         smp_wmb();
 403         apic_sync_vapic(s, SYNC_FROM_VAPIC);
 404     }
 405     apic_update_irq(s);
 406 }
 407
 408 static void apic_eoi(APICCommonState *s)
 409 {
 410     int isrv;
 411     isrv = get_highest_priority_int(s->isr);
 412     if (isrv < 0)
 413         return;
 414     reset_bit(s->isr, isrv);
 415     if (!(s->spurious_vec & APIC_SV_DIRECTED_IO) && get_bit(s->tmr, isrv)) {
 416         ioapic_eoi_broadcast(isrv);
 417     }
 418     apic_sync_vapic(s, SYNC_FROM_VAPIC | SYNC_TO_VAPIC);
 419     apic_update_irq(s);
 420 }
 421
 422 static int apic_find_dest(uint8_t dest)
 423 {
 424     APICCommonState *apic = local_apics[dest];
 425     int i;
 426
 427     if (apic && apic->id == dest)
 428         return dest;  /* shortcut in case apic->id == apic->idx */
 429
 430     for (i = 0; i < MAX_APICS; i++) {
 431         apic = local_apics[i];
 432         if (apic && apic->id == dest)
 433             return i;
 434         if (!apic)
 435             break;
 436     }
 437
 438     return -1;
 439 }
 440
 441 static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
 442                                       uint8_t dest, uint8_t dest_mode)
 443 {
 444     APICCommonState *apic_iter;
 445     int i;
 446
 447     if (dest_mode == 0) {
 448         if (dest == 0xff) {
 449             memset(deliver_bitmask, 0xff, MAX_APIC_WORDS * sizeof(uint32_t));
 450         } else {
 451             int idx = apic_find_dest(dest);
 452             memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
 453             if (idx >= 0)
 454                 set_bit(deliver_bitmask, idx);
 455         }
 456     } else {
 457         /* XXX: cluster mode */
 458         memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
 459         for(i = 0; i < MAX_APICS; i++) {
 460             apic_iter = local_apics[i];
 461             if (apic_iter) {
 462                 if (apic_iter->dest_mode == 0xf) {
 463                     if (dest & apic_iter->log_dest)
 464                         set_bit(deliver_bitmask, i);
 465                 } else if (apic_iter->dest_mode == 0x0) {
 466                     if ((dest & 0xf0) == (apic_iter->log_dest & 0xf0) &&
 467                         (dest & apic_iter->log_dest & 0x0f)) {
 468                         set_bit(deliver_bitmask, i);
 469                     }
 470                 }
 471             } else {
 472                 break;
 473             }
 474         }
 475     }
 476 }
 477
 478 static void apic_startup(APICCommonState *s, int vector_num)
 479 {
 480     s->sipi_vector = vector_num;
 481     cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_SIPI);
 482 }
 483
 484 void apic_sipi(DeviceState *d)
 485 {
 486     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 487
 488     cpu_reset_interrupt(&s->cpu->env, CPU_INTERRUPT_SIPI);
 489
 490     if (!s->wait_for_sipi)
 491         return;
 492     cpu_x86_load_seg_cache_sipi(s->cpu, s->sipi_vector);
 493     s->wait_for_sipi = 0;
 494 }
 495
 496 static void apic_deliver(DeviceState *d, uint8_t dest, uint8_t dest_mode,
 497                          uint8_t delivery_mode, uint8_t vector_num,
 498                          uint8_t trigger_mode)
 499 {
 500     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 501     uint32_t deliver_bitmask[MAX_APIC_WORDS];
 502     int dest_shorthand = (s->icr[0] >> 18) & 3;
 503     APICCommonState *apic_iter;
 504
 505     switch (dest_shorthand) {
 506     case 0:
 507         apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
 508         break;
 509     case 1:
 510         memset(deliver_bitmask, 0x00, sizeof(deliver_bitmask));
 511         set_bit(deliver_bitmask, s->idx);
 512         break;
 513     case 2:
 514         memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
 515         break;
 516     case 3:
 517         memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
 518         reset_bit(deliver_bitmask, s->idx);
 519         break;
 520     }
 521
 522     switch (delivery_mode) {
 523         case APIC_DM_INIT:
 524             {
 525                 int trig_mode = (s->icr[0] >> 15) & 1;
 526                 int level = (s->icr[0] >> 14) & 1;
 527                 if (level == 0 && trig_mode == 1) {
 528                     foreach_apic(apic_iter, deliver_bitmask,
 529                                  apic_iter->arb_id = apic_iter->id );
 530                     return;
 531                 }
 532             }
 533             break;
 534
 535         case APIC_DM_SIPI:
 536             foreach_apic(apic_iter, deliver_bitmask,
 537                          apic_startup(apic_iter, vector_num) );
 538             return;
 539     }
 540
 541     apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, trigger_mode);
 542 }
 543
 544 static bool apic_check_pic(APICCommonState *s)
 545 {
 546     if (!apic_accept_pic_intr(&s->busdev.qdev) || !pic_get_output(isa_pic)) {
 547         return false;
 548     }
 549     apic_deliver_pic_intr(&s->busdev.qdev, 1);
 550     return true;
 551 }
 552
 553 int apic_get_interrupt(DeviceState *d)
 554 {
 555     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 556     int intno;
 557
 558     /* if the APIC is installed or enabled, we let the 8259 handle the
 559        IRQs */
 560     if (!s)
 561         return -1;
 562     if (!(s->spurious_vec & APIC_SV_ENABLE))
 563         return -1;
 564
 565     apic_sync_vapic(s, SYNC_FROM_VAPIC);
 566     intno = apic_irq_pending(s);
 567
 568     if (intno == 0) {
 569         apic_sync_vapic(s, SYNC_TO_VAPIC);
 570         return -1;
 571     } else if (intno < 0) {
 572         apic_sync_vapic(s, SYNC_TO_VAPIC);
 573         return s->spurious_vec & 0xff;
 574     }
 575     reset_bit(s->irr, intno);
 576     set_bit(s->isr, intno);
 577     apic_sync_vapic(s, SYNC_TO_VAPIC);
 578
 579     /* re-inject if there is still a pending PIC interrupt */
 580     apic_check_pic(s);
 581
 582     apic_update_irq(s);
 583
 584     return intno;
 585 }
 586
 587 int apic_accept_pic_intr(DeviceState *d)
 588 {
 589     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 590     uint32_t lvt0;
 591
 592     if (!s)
 593         return -1;
 594
 595     lvt0 = s->lvt[APIC_LVT_LINT0];
 596
 597     if ((s->apicbase & MSR_IA32_APICBASE_ENABLE) == 0 ||
 598         (lvt0 & APIC_LVT_MASKED) == 0)
 599         return 1;
 600
 601     return 0;
 602 }
 603
 604 static uint32_t apic_get_current_count(APICCommonState *s)
 605 {
 606     int64_t d;
 607     uint32_t val;
 608     d = (qemu_get_clock_ns(vm_clock) - s->initial_count_load_time) >>
 609         s->count_shift;
 610     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
 611         /* periodic */
 612         val = s->initial_count - (d % ((uint64_t)s->initial_count + 1));
 613     } else {
 614         if (d >= s->initial_count)
 615             val = 0;
 616         else
 617             val = s->initial_count - d;
 618     }
 619     return val;
 620 }
 621
 622 static void apic_timer_update(APICCommonState *s, int64_t current_time)
 623 {
 624     if (apic_next_timer(s, current_time)) {
 625         qemu_mod_timer(s->timer, s->next_time);
 626     } else {
 627         qemu_del_timer(s->timer);
 628     }
 629 }
 630
 631 static void apic_timer(void *opaque)
 632 {
 633     APICCommonState *s = opaque;
 634
 635     apic_local_deliver(s, APIC_LVT_TIMER);
 636     apic_timer_update(s, s->next_time);
 637 }
 638
 639 static uint32_t apic_mem_readb(void *opaque, hwaddr addr)
 640 {
 641     return 0;
 642 }
 643
 644 static uint32_t apic_mem_readw(void *opaque, hwaddr addr)
 645 {
 646     return 0;
 647 }
 648
 649 static void apic_mem_writeb(void *opaque, hwaddr addr, uint32_t val)
 650 {
 651 }
 652
 653 static void apic_mem_writew(void *opaque, hwaddr addr, uint32_t val)
 654 {
 655 }
 656
 657 static uint32_t apic_mem_readl(void *opaque, hwaddr addr)
 658 {
 659     DeviceState *d;
 660     APICCommonState *s;
 661     uint32_t val;
 662     int index;
 663
 664     d = cpu_get_current_apic();
 665     if (!d) {
 666         return 0;
 667     }
 668     s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 669
 670     index = (addr >> 4) & 0xff;
 671     switch(index) {
 672     case 0x02: /* id */
 673         val = s->id << 24;
 674         break;
 675     case 0x03: /* version */
 676         val = 0x11 | ((APIC_LVT_NB - 1) << 16); /* version 0x11 */
 677         break;
 678     case 0x08:
 679         apic_sync_vapic(s, SYNC_FROM_VAPIC);
 680         if (apic_report_tpr_access) {
 681             cpu_report_tpr_access(&s->cpu->env, TPR_ACCESS_READ);
 682         }
 683         val = s->tpr;
 684         break;
 685     case 0x09:
 686         val = apic_get_arb_pri(s);
 687         break;
 688     case 0x0a:
 689         /* ppr */
 690         val = apic_get_ppr(s);
 691         break;
 692     case 0x0b:
 693         val = 0;
 694         break;
 695     case 0x0d:
 696         val = s->log_dest << 24;
 697         break;
 698     case 0x0e:
 699         val = s->dest_mode << 28;
 700         break;
 701     case 0x0f:
 702         val = s->spurious_vec;
 703         break;
 704     case 0x10 ... 0x17:
 705         val = s->isr[index & 7];
 706         break;
 707     case 0x18 ... 0x1f:
 708         val = s->tmr[index & 7];
 709         break;
 710     case 0x20 ... 0x27:
 711         val = s->irr[index & 7];
 712         break;
 713     case 0x28:
 714         val = s->esr;
 715         break;
 716     case 0x30:
 717     case 0x31:
 718         val = s->icr[index & 1];
 719         break;
 720     case 0x32 ... 0x37:
 721         val = s->lvt[index - 0x32];
 722         break;
 723     case 0x38:
 724         val = s->initial_count;
 725         break;
 726     case 0x39:
 727         val = apic_get_current_count(s);
 728         break;
 729     case 0x3e:
 730         val = s->divide_conf;
 731         break;
 732     default:
 733         s->esr |= ESR_ILLEGAL_ADDRESS;
 734         val = 0;
 735         break;
 736     }
 737     trace_apic_mem_readl(addr, val);
 738     return val;
 739 }
 740
 741 static void apic_send_msi(hwaddr addr, uint32_t data)
 742 {
 743     uint8_t dest = (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
 744     uint8_t vector = (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
 745     uint8_t dest_mode = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
 746     uint8_t trigger_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;
 747     uint8_t delivery = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7;
 748     /* XXX: Ignore redirection hint. */
 749     apic_deliver_irq(dest, dest_mode, delivery, vector, trigger_mode);
 750 }
 751
 752 static void apic_mem_writel(void *opaque, hwaddr addr, uint32_t val)
 753 {
 754     DeviceState *d;
 755     APICCommonState *s;
 756     int index = (addr >> 4) & 0xff;
 757     if (addr > 0xfff || !index) {
 758         /* MSI and MMIO APIC are at the same memory location,
 759          * but actually not on the global bus: MSI is on PCI bus
 760          * APIC is connected directly to the CPU.
 761          * Mapping them on the global bus happens to work because
 762          * MSI registers are reserved in APIC MMIO and vice versa. */
 763         apic_send_msi(addr, val);
 764         return;
 765     }
 766
 767     d = cpu_get_current_apic();
 768     if (!d) {
 769         return;
 770     }
 771     s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 772
 773     trace_apic_mem_writel(addr, val);
 774
 775     switch(index) {
 776     case 0x02:
 777         s->id = (val >> 24);
 778         break;
 779     case 0x03:
 780         break;
 781     case 0x08:
 782         if (apic_report_tpr_access) {
 783             cpu_report_tpr_access(&s->cpu->env, TPR_ACCESS_WRITE);
 784         }
 785         s->tpr = val;
 786         apic_sync_vapic(s, SYNC_TO_VAPIC);
 787         apic_update_irq(s);
 788         break;
 789     case 0x09:
 790     case 0x0a:
 791         break;
 792     case 0x0b: /* EOI */
 793         apic_eoi(s);
 794         break;
 795     case 0x0d:
 796         s->log_dest = val >> 24;
 797         break;
 798     case 0x0e:
 799         s->dest_mode = val >> 28;
 800         break;
 801     case 0x0f:
 802         s->spurious_vec = val & 0x1ff;
 803         apic_update_irq(s);
 804         break;
 805     case 0x10 ... 0x17:
 806     case 0x18 ... 0x1f:
 807     case 0x20 ... 0x27:
 808     case 0x28:
 809         break;
 810     case 0x30:
 811         s->icr[0] = val;
 812         apic_deliver(d, (s->icr[1] >> 24) & 0xff, (s->icr[0] >> 11) & 1,
 813                      (s->icr[0] >> 8) & 7, (s->icr[0] & 0xff),
 814                      (s->icr[0] >> 15) & 1);
 815         break;
 816     case 0x31:
 817         s->icr[1] = val;
 818         break;
 819     case 0x32 ... 0x37:
 820         {
 821             int n = index - 0x32;
 822             s->lvt[n] = val;
 823             if (n == APIC_LVT_TIMER) {
 824                 apic_timer_update(s, qemu_get_clock_ns(vm_clock));
 825             } else if (n == APIC_LVT_LINT0 && apic_check_pic(s)) {
 826                 apic_update_irq(s);
 827             }
 828         }
 829         break;
 830     case 0x38:
 831         s->initial_count = val;
 832         s->initial_count_load_time = qemu_get_clock_ns(vm_clock);
 833         apic_timer_update(s, s->initial_count_load_time);
 834         break;
 835     case 0x39:
 836         break;
 837     case 0x3e:
 838         {
 839             int v;
 840             s->divide_conf = val & 0xb;
 841             v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
 842             s->count_shift = (v + 1) & 7;
 843         }
 844         break;
 845     default:
 846         s->esr |= ESR_ILLEGAL_ADDRESS;
 847         break;
 848     }
 849 }
 850
 851 static void apic_pre_save(APICCommonState *s)
 852 {
 853     apic_sync_vapic(s, SYNC_FROM_VAPIC);
 854 }
 855
 856 static void apic_post_load(APICCommonState *s)
 857 {
 858     if (s->timer_expiry != -1) {
 859         qemu_mod_timer(s->timer, s->timer_expiry);
 860     } else {
 861         qemu_del_timer(s->timer);
 862     }
 863 }
 864
 865 static const MemoryRegionOps apic_io_ops = {
 866     .old_mmio = {
 867         .read = { apic_mem_readb, apic_mem_readw, apic_mem_readl, },
 868         .write = { apic_mem_writeb, apic_mem_writew, apic_mem_writel, },
 869     },
 870     .endianness = DEVICE_NATIVE_ENDIAN,
 871 };
 872
 873 static void apic_init(APICCommonState *s)
 874 {
 875     memory_region_init_io(&s->io_memory, &apic_io_ops, s, "apic-msi",
 876                           MSI_SPACE_SIZE);
 877
 878     s->timer = qemu_new_timer_ns(vm_clock, apic_timer, s);
 879     local_apics[s->idx] = s;
 880
 881     msi_supported = true;
 882 }
 883
 884 static void apic_class_init(ObjectClass *klass, void *data)
 885 {
 886     APICCommonClass *k = APIC_COMMON_CLASS(klass);
 887
 888     k->init = apic_init;
 889     k->set_base = apic_set_base;
 890     k->set_tpr = apic_set_tpr;
 891     k->get_tpr = apic_get_tpr;
 892     k->vapic_base_update = apic_vapic_base_update;
 893     k->external_nmi = apic_external_nmi;
 894     k->pre_save = apic_pre_save;
 895     k->post_load = apic_post_load;
 896 }
 897
 898 static const TypeInfo apic_info = {
 899     .name          = "apic",
 900     .instance_size = sizeof(APICCommonState),
 901     .parent        = TYPE_APIC_COMMON,
 902     .class_init    = apic_class_init,
 903 };
 904
 905 static void apic_register_types(void)
 906 {
 907     type_register_static(&apic_info);
 908 }
 909
 910 type_init(apic_register_types)