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 "apic_internal.h"
  20 #include "apic.h"
  21 #include "ioapic.h"
  22 #include "host-utils.h"
  23 #include "trace.h"
  24 #include "pc.h"
  25
  26 #define MAX_APIC_WORDS 8
  27
  28 /* Intel APIC constants: from include/asm/msidef.h */
  29 #define MSI_DATA_VECTOR_SHIFT           0
  30 #define MSI_DATA_VECTOR_MASK            0x000000ff
  31 #define MSI_DATA_DELIVERY_MODE_SHIFT    8
  32 #define MSI_DATA_TRIGGER_SHIFT          15
  33 #define MSI_DATA_LEVEL_SHIFT            14
  34 #define MSI_ADDR_DEST_MODE_SHIFT        2
  35 #define MSI_ADDR_DEST_ID_SHIFT          12
  36 #define MSI_ADDR_DEST_ID_MASK           0x00ffff0
  37
  38 static APICCommonState *local_apics[MAX_APICS + 1];
  39
  40 static void apic_set_irq(APICCommonState *s, int vector_num, int trigger_mode);
  41 static void apic_update_irq(APICCommonState *s);
  42 static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
  43                                       uint8_t dest, uint8_t dest_mode);
  44
  45 /* Find first bit starting from msb */
  46 static int fls_bit(uint32_t value)
  47 {
  48     return 31 - clz32(value);
  49 }
  50
  51 /* Find first bit starting from lsb */
  52 static int ffs_bit(uint32_t value)
  53 {
  54     return ctz32(value);
  55 }
  56
  57 static inline void set_bit(uint32_t *tab, int index)
  58 {
  59     int i, mask;
  60     i = index >> 5;
  61     mask = 1 << (index & 0x1f);
  62     tab[i] |= mask;
  63 }
  64
  65 static inline void reset_bit(uint32_t *tab, int index)
  66 {
  67     int i, mask;
  68     i = index >> 5;
  69     mask = 1 << (index & 0x1f);
  70     tab[i] &= ~mask;
  71 }
  72
  73 static inline int get_bit(uint32_t *tab, int index)
  74 {
  75     int i, mask;
  76     i = index >> 5;
  77     mask = 1 << (index & 0x1f);
  78     return !!(tab[i] & mask);
  79 }
  80
  81 static void apic_local_deliver(APICCommonState *s, int vector)
  82 {
  83     uint32_t lvt = s->lvt[vector];
  84     int trigger_mode;
  85
  86     trace_apic_local_deliver(vector, (lvt >> 8) & 7);
  87
  88     if (lvt & APIC_LVT_MASKED)
  89         return;
  90
  91     switch ((lvt >> 8) & 7) {
  92     case APIC_DM_SMI:
  93         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_SMI);
  94         break;
  95
  96     case APIC_DM_NMI:
  97         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_NMI);
  98         break;
  99
 100     case APIC_DM_EXTINT:
 101         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
 102         break;
 103
 104     case APIC_DM_FIXED:
 105         trigger_mode = APIC_TRIGGER_EDGE;
 106         if ((vector == APIC_LVT_LINT0 || vector == APIC_LVT_LINT1) &&
 107             (lvt & APIC_LVT_LEVEL_TRIGGER))
 108             trigger_mode = APIC_TRIGGER_LEVEL;
 109         apic_set_irq(s, lvt & 0xff, trigger_mode);
 110     }
 111 }
 112
 113 void apic_deliver_pic_intr(DeviceState *d, int level)
 114 {
 115     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 116
 117     if (level) {
 118         apic_local_deliver(s, APIC_LVT_LINT0);
 119     } else {
 120         uint32_t lvt = s->lvt[APIC_LVT_LINT0];
 121
 122         switch ((lvt >> 8) & 7) {
 123         case APIC_DM_FIXED:
 124             if (!(lvt & APIC_LVT_LEVEL_TRIGGER))
 125                 break;
 126             reset_bit(s->irr, lvt & 0xff);
 127             /* fall through */
 128         case APIC_DM_EXTINT:
 129             cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
 130             break;
 131         }
 132     }
 133 }
 134
 135 static void apic_external_nmi(APICCommonState *s)
 136 {
 137     apic_local_deliver(s, APIC_LVT_LINT1);
 138 }
 139
 140 #define foreach_apic(apic, deliver_bitmask, code) \
 141 {\
 142     int __i, __j, __mask;\
 143     for(__i = 0; __i < MAX_APIC_WORDS; __i++) {\
 144         __mask = deliver_bitmask[__i];\
 145         if (__mask) {\
 146             for(__j = 0; __j < 32; __j++) {\
 147                 if (__mask & (1 << __j)) {\
 148                     apic = local_apics[__i * 32 + __j];\
 149                     if (apic) {\
 150                         code;\
 151                     }\
 152                 }\
 153             }\
 154         }\
 155     }\
 156 }
 157
 158 static void apic_bus_deliver(const uint32_t *deliver_bitmask,
 159                              uint8_t delivery_mode, uint8_t vector_num,
 160                              uint8_t trigger_mode)
 161 {
 162     APICCommonState *apic_iter;
 163
 164     switch (delivery_mode) {
 165         case APIC_DM_LOWPRI:
 166             /* XXX: search for focus processor, arbitration */
 167             {
 168                 int i, d;
 169                 d = -1;
 170                 for(i = 0; i < MAX_APIC_WORDS; i++) {
 171                     if (deliver_bitmask[i]) {
 172                         d = i * 32 + ffs_bit(deliver_bitmask[i]);
 173                         break;
 174                     }
 175                 }
 176                 if (d >= 0) {
 177                     apic_iter = local_apics[d];
 178                     if (apic_iter) {
 179                         apic_set_irq(apic_iter, vector_num, trigger_mode);
 180                     }
 181                 }
 182             }
 183             return;
 184
 185         case APIC_DM_FIXED:
 186             break;
 187
 188         case APIC_DM_SMI:
 189             foreach_apic(apic_iter, deliver_bitmask,
 190                 cpu_interrupt(apic_iter->cpu_env, CPU_INTERRUPT_SMI) );
 191             return;
 192
 193         case APIC_DM_NMI:
 194             foreach_apic(apic_iter, deliver_bitmask,
 195                 cpu_interrupt(apic_iter->cpu_env, CPU_INTERRUPT_NMI) );
 196             return;
 197
 198         case APIC_DM_INIT:
 199             /* normal INIT IPI sent to processors */
 200             foreach_apic(apic_iter, deliver_bitmask,
 201                          cpu_interrupt(apic_iter->cpu_env, CPU_INTERRUPT_INIT) );
 202             return;
 203
 204         case APIC_DM_EXTINT:
 205             /* handled in I/O APIC code */
 206             break;
 207
 208         default:
 209             return;
 210     }
 211
 212     foreach_apic(apic_iter, deliver_bitmask,
 213                  apic_set_irq(apic_iter, vector_num, trigger_mode) );
 214 }
 215
 216 void apic_deliver_irq(uint8_t dest, uint8_t dest_mode, uint8_t delivery_mode,
 217                       uint8_t vector_num, uint8_t trigger_mode)
 218 {
 219     uint32_t deliver_bitmask[MAX_APIC_WORDS];
 220
 221     trace_apic_deliver_irq(dest, dest_mode, delivery_mode, vector_num,
 222                            trigger_mode);
 223
 224     apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
 225     apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, trigger_mode);
 226 }
 227
 228 static void apic_set_base(APICCommonState *s, uint64_t val)
 229 {
 230     s->apicbase = (val & 0xfffff000) |
 231         (s->apicbase & (MSR_IA32_APICBASE_BSP | MSR_IA32_APICBASE_ENABLE));
 232     /* if disabled, cannot be enabled again */
 233     if (!(val & MSR_IA32_APICBASE_ENABLE)) {
 234         s->apicbase &= ~MSR_IA32_APICBASE_ENABLE;
 235         cpu_clear_apic_feature(s->cpu_env);
 236         s->spurious_vec &= ~APIC_SV_ENABLE;
 237     }
 238 }
 239
 240 static void apic_set_tpr(APICCommonState *s, uint8_t val)
 241 {
 242     s->tpr = (val & 0x0f) << 4;
 243     apic_update_irq(s);
 244 }
 245
 246 /* return -1 if no bit is set */
 247 static int get_highest_priority_int(uint32_t *tab)
 248 {
 249     int i;
 250     for(i = 7; i >= 0; i--) {
 251         if (tab[i] != 0) {
 252             return i * 32 + fls_bit(tab[i]);
 253         }
 254     }
 255     return -1;
 256 }
 257
 258 static int apic_get_ppr(APICCommonState *s)
 259 {
 260     int tpr, isrv, ppr;
 261
 262     tpr = (s->tpr >> 4);
 263     isrv = get_highest_priority_int(s->isr);
 264     if (isrv < 0)
 265         isrv = 0;
 266     isrv >>= 4;
 267     if (tpr >= isrv)
 268         ppr = s->tpr;
 269     else
 270         ppr = isrv << 4;
 271     return ppr;
 272 }
 273
 274 static int apic_get_arb_pri(APICCommonState *s)
 275 {
 276     /* XXX: arbitration */
 277     return 0;
 278 }
 279
 280
 281 /*
 282  * <0 - low prio interrupt,
 283  * 0  - no interrupt,
 284  * >0 - interrupt number
 285  */
 286 static int apic_irq_pending(APICCommonState *s)
 287 {
 288     int irrv, ppr;
 289     irrv = get_highest_priority_int(s->irr);
 290     if (irrv < 0) {
 291         return 0;
 292     }
 293     ppr = apic_get_ppr(s);
 294     if (ppr && (irrv & 0xf0) <= (ppr & 0xf0)) {
 295         return -1;
 296     }
 297
 298     return irrv;
 299 }
 300
 301 /* signal the CPU if an irq is pending */
 302 static void apic_update_irq(APICCommonState *s)
 303 {
 304     if (!(s->spurious_vec & APIC_SV_ENABLE)) {
 305         return;
 306     }
 307     if (apic_irq_pending(s) > 0) {
 308         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
 309     } else if (apic_accept_pic_intr(&s->busdev.qdev) &&
 310                pic_get_output(isa_pic)) {
 311         apic_deliver_pic_intr(&s->busdev.qdev, 1);
 312     }
 313 }
 314
 315 static void apic_set_irq(APICCommonState *s, int vector_num, int trigger_mode)
 316 {
 317     apic_report_irq_delivered(!get_bit(s->irr, vector_num));
 318
 319     set_bit(s->irr, vector_num);
 320     if (trigger_mode)
 321         set_bit(s->tmr, vector_num);
 322     else
 323         reset_bit(s->tmr, vector_num);
 324     apic_update_irq(s);
 325 }
 326
 327 static void apic_eoi(APICCommonState *s)
 328 {
 329     int isrv;
 330     isrv = get_highest_priority_int(s->isr);
 331     if (isrv < 0)
 332         return;
 333     reset_bit(s->isr, isrv);
 334     if (!(s->spurious_vec & APIC_SV_DIRECTED_IO) && get_bit(s->tmr, isrv)) {
 335         ioapic_eoi_broadcast(isrv);
 336     }
 337     apic_update_irq(s);
 338 }
 339
 340 static int apic_find_dest(uint8_t dest)
 341 {
 342     APICCommonState *apic = local_apics[dest];
 343     int i;
 344
 345     if (apic && apic->id == dest)
 346         return dest;  /* shortcut in case apic->id == apic->idx */
 347
 348     for (i = 0; i < MAX_APICS; i++) {
 349         apic = local_apics[i];
 350         if (apic && apic->id == dest)
 351             return i;
 352         if (!apic)
 353             break;
 354     }
 355
 356     return -1;
 357 }
 358
 359 static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
 360                                       uint8_t dest, uint8_t dest_mode)
 361 {
 362     APICCommonState *apic_iter;
 363     int i;
 364
 365     if (dest_mode == 0) {
 366         if (dest == 0xff) {
 367             memset(deliver_bitmask, 0xff, MAX_APIC_WORDS * sizeof(uint32_t));
 368         } else {
 369             int idx = apic_find_dest(dest);
 370             memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
 371             if (idx >= 0)
 372                 set_bit(deliver_bitmask, idx);
 373         }
 374     } else {
 375         /* XXX: cluster mode */
 376         memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
 377         for(i = 0; i < MAX_APICS; i++) {
 378             apic_iter = local_apics[i];
 379             if (apic_iter) {
 380                 if (apic_iter->dest_mode == 0xf) {
 381                     if (dest & apic_iter->log_dest)
 382                         set_bit(deliver_bitmask, i);
 383                 } else if (apic_iter->dest_mode == 0x0) {
 384                     if ((dest & 0xf0) == (apic_iter->log_dest & 0xf0) &&
 385                         (dest & apic_iter->log_dest & 0x0f)) {
 386                         set_bit(deliver_bitmask, i);
 387                     }
 388                 }
 389             } else {
 390                 break;
 391             }
 392         }
 393     }
 394 }
 395
 396 static void apic_startup(APICCommonState *s, int vector_num)
 397 {
 398     s->sipi_vector = vector_num;
 399     cpu_interrupt(s->cpu_env, CPU_INTERRUPT_SIPI);
 400 }
 401
 402 void apic_sipi(DeviceState *d)
 403 {
 404     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 405
 406     cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_SIPI);
 407
 408     if (!s->wait_for_sipi)
 409         return;
 410     cpu_x86_load_seg_cache_sipi(s->cpu_env, s->sipi_vector);
 411     s->wait_for_sipi = 0;
 412 }
 413
 414 static void apic_deliver(DeviceState *d, uint8_t dest, uint8_t dest_mode,
 415                          uint8_t delivery_mode, uint8_t vector_num,
 416                          uint8_t trigger_mode)
 417 {
 418     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 419     uint32_t deliver_bitmask[MAX_APIC_WORDS];
 420     int dest_shorthand = (s->icr[0] >> 18) & 3;
 421     APICCommonState *apic_iter;
 422
 423     switch (dest_shorthand) {
 424     case 0:
 425         apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
 426         break;
 427     case 1:
 428         memset(deliver_bitmask, 0x00, sizeof(deliver_bitmask));
 429         set_bit(deliver_bitmask, s->idx);
 430         break;
 431     case 2:
 432         memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
 433         break;
 434     case 3:
 435         memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
 436         reset_bit(deliver_bitmask, s->idx);
 437         break;
 438     }
 439
 440     switch (delivery_mode) {
 441         case APIC_DM_INIT:
 442             {
 443                 int trig_mode = (s->icr[0] >> 15) & 1;
 444                 int level = (s->icr[0] >> 14) & 1;
 445                 if (level == 0 && trig_mode == 1) {
 446                     foreach_apic(apic_iter, deliver_bitmask,
 447                                  apic_iter->arb_id = apic_iter->id );
 448                     return;
 449                 }
 450             }
 451             break;
 452
 453         case APIC_DM_SIPI:
 454             foreach_apic(apic_iter, deliver_bitmask,
 455                          apic_startup(apic_iter, vector_num) );
 456             return;
 457     }
 458
 459     apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, trigger_mode);
 460 }
 461
 462 int apic_get_interrupt(DeviceState *d)
 463 {
 464     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 465     int intno;
 466
 467     /* if the APIC is installed or enabled, we let the 8259 handle the
 468        IRQs */
 469     if (!s)
 470         return -1;
 471     if (!(s->spurious_vec & APIC_SV_ENABLE))
 472         return -1;
 473
 474     intno = apic_irq_pending(s);
 475
 476     if (intno == 0) {
 477         return -1;
 478     } else if (intno < 0) {
 479         return s->spurious_vec & 0xff;
 480     }
 481     reset_bit(s->irr, intno);
 482     set_bit(s->isr, intno);
 483     apic_update_irq(s);
 484     return intno;
 485 }
 486
 487 int apic_accept_pic_intr(DeviceState *d)
 488 {
 489     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 490     uint32_t lvt0;
 491
 492     if (!s)
 493         return -1;
 494
 495     lvt0 = s->lvt[APIC_LVT_LINT0];
 496
 497     if ((s->apicbase & MSR_IA32_APICBASE_ENABLE) == 0 ||
 498         (lvt0 & APIC_LVT_MASKED) == 0)
 499         return 1;
 500
 501     return 0;
 502 }
 503
 504 static uint32_t apic_get_current_count(APICCommonState *s)
 505 {
 506     int64_t d;
 507     uint32_t val;
 508     d = (qemu_get_clock_ns(vm_clock) - s->initial_count_load_time) >>
 509         s->count_shift;
 510     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
 511         /* periodic */
 512         val = s->initial_count - (d % ((uint64_t)s->initial_count + 1));
 513     } else {
 514         if (d >= s->initial_count)
 515             val = 0;
 516         else
 517             val = s->initial_count - d;
 518     }
 519     return val;
 520 }
 521
 522 static void apic_timer_update(APICCommonState *s, int64_t current_time)
 523 {
 524     if (apic_next_timer(s, current_time)) {
 525         qemu_mod_timer(s->timer, s->next_time);
 526     } else {
 527         qemu_del_timer(s->timer);
 528     }
 529 }
 530
 531 static void apic_timer(void *opaque)
 532 {
 533     APICCommonState *s = opaque;
 534
 535     apic_local_deliver(s, APIC_LVT_TIMER);
 536     apic_timer_update(s, s->next_time);
 537 }
 538
 539 static uint32_t apic_mem_readb(void *opaque, target_phys_addr_t addr)
 540 {
 541     return 0;
 542 }
 543
 544 static uint32_t apic_mem_readw(void *opaque, target_phys_addr_t addr)
 545 {
 546     return 0;
 547 }
 548
 549 static void apic_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 550 {
 551 }
 552
 553 static void apic_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
 554 {
 555 }
 556
 557 static uint32_t apic_mem_readl(void *opaque, target_phys_addr_t addr)
 558 {
 559     DeviceState *d;
 560     APICCommonState *s;
 561     uint32_t val;
 562     int index;
 563
 564     d = cpu_get_current_apic();
 565     if (!d) {
 566         return 0;
 567     }
 568     s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 569
 570     index = (addr >> 4) & 0xff;
 571     switch(index) {
 572     case 0x02: /* id */
 573         val = s->id << 24;
 574         break;
 575     case 0x03: /* version */
 576         val = 0x11 | ((APIC_LVT_NB - 1) << 16); /* version 0x11 */
 577         break;
 578     case 0x08:
 579         val = s->tpr;
 580         break;
 581     case 0x09:
 582         val = apic_get_arb_pri(s);
 583         break;
 584     case 0x0a:
 585         /* ppr */
 586         val = apic_get_ppr(s);
 587         break;
 588     case 0x0b:
 589         val = 0;
 590         break;
 591     case 0x0d:
 592         val = s->log_dest << 24;
 593         break;
 594     case 0x0e:
 595         val = s->dest_mode << 28;
 596         break;
 597     case 0x0f:
 598         val = s->spurious_vec;
 599         break;
 600     case 0x10 ... 0x17:
 601         val = s->isr[index & 7];
 602         break;
 603     case 0x18 ... 0x1f:
 604         val = s->tmr[index & 7];
 605         break;
 606     case 0x20 ... 0x27:
 607         val = s->irr[index & 7];
 608         break;
 609     case 0x28:
 610         val = s->esr;
 611         break;
 612     case 0x30:
 613     case 0x31:
 614         val = s->icr[index & 1];
 615         break;
 616     case 0x32 ... 0x37:
 617         val = s->lvt[index - 0x32];
 618         break;
 619     case 0x38:
 620         val = s->initial_count;
 621         break;
 622     case 0x39:
 623         val = apic_get_current_count(s);
 624         break;
 625     case 0x3e:
 626         val = s->divide_conf;
 627         break;
 628     default:
 629         s->esr |= ESR_ILLEGAL_ADDRESS;
 630         val = 0;
 631         break;
 632     }
 633     trace_apic_mem_readl(addr, val);
 634     return val;
 635 }
 636
 637 static void apic_send_msi(target_phys_addr_t addr, uint32_t data)
 638 {
 639     uint8_t dest = (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
 640     uint8_t vector = (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
 641     uint8_t dest_mode = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
 642     uint8_t trigger_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;
 643     uint8_t delivery = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7;
 644     /* XXX: Ignore redirection hint. */
 645     apic_deliver_irq(dest, dest_mode, delivery, vector, trigger_mode);
 646 }
 647
 648 static void apic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 649 {
 650     DeviceState *d;
 651     APICCommonState *s;
 652     int index = (addr >> 4) & 0xff;
 653     if (addr > 0xfff || !index) {
 654         /* MSI and MMIO APIC are at the same memory location,
 655          * but actually not on the global bus: MSI is on PCI bus
 656          * APIC is connected directly to the CPU.
 657          * Mapping them on the global bus happens to work because
 658          * MSI registers are reserved in APIC MMIO and vice versa. */
 659         apic_send_msi(addr, val);
 660         return;
 661     }
 662
 663     d = cpu_get_current_apic();
 664     if (!d) {
 665         return;
 666     }
 667     s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 668
 669     trace_apic_mem_writel(addr, val);
 670
 671     switch(index) {
 672     case 0x02:
 673         s->id = (val >> 24);
 674         break;
 675     case 0x03:
 676         break;
 677     case 0x08:
 678         s->tpr = val;
 679         apic_update_irq(s);
 680         break;
 681     case 0x09:
 682     case 0x0a:
 683         break;
 684     case 0x0b: /* EOI */
 685         apic_eoi(s);
 686         break;
 687     case 0x0d:
 688         s->log_dest = val >> 24;
 689         break;
 690     case 0x0e:
 691         s->dest_mode = val >> 28;
 692         break;
 693     case 0x0f:
 694         s->spurious_vec = val & 0x1ff;
 695         apic_update_irq(s);
 696         break;
 697     case 0x10 ... 0x17:
 698     case 0x18 ... 0x1f:
 699     case 0x20 ... 0x27:
 700     case 0x28:
 701         break;
 702     case 0x30:
 703         s->icr[0] = val;
 704         apic_deliver(d, (s->icr[1] >> 24) & 0xff, (s->icr[0] >> 11) & 1,
 705                      (s->icr[0] >> 8) & 7, (s->icr[0] & 0xff),
 706                      (s->icr[0] >> 15) & 1);
 707         break;
 708     case 0x31:
 709         s->icr[1] = val;
 710         break;
 711     case 0x32 ... 0x37:
 712         {
 713             int n = index - 0x32;
 714             s->lvt[n] = val;
 715             if (n == APIC_LVT_TIMER)
 716                 apic_timer_update(s, qemu_get_clock_ns(vm_clock));
 717         }
 718         break;
 719     case 0x38:
 720         s->initial_count = val;
 721         s->initial_count_load_time = qemu_get_clock_ns(vm_clock);
 722         apic_timer_update(s, s->initial_count_load_time);
 723         break;
 724     case 0x39:
 725         break;
 726     case 0x3e:
 727         {
 728             int v;
 729             s->divide_conf = val & 0xb;
 730             v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
 731             s->count_shift = (v + 1) & 7;
 732         }
 733         break;
 734     default:
 735         s->esr |= ESR_ILLEGAL_ADDRESS;
 736         break;
 737     }
 738 }
 739
 740 static void apic_post_load(APICCommonState *s)
 741 {
 742     if (s->timer_expiry != -1) {
 743         qemu_mod_timer(s->timer, s->timer_expiry);
 744     } else {
 745         qemu_del_timer(s->timer);
 746     }
 747 }
 748
 749 static const MemoryRegionOps apic_io_ops = {
 750     .old_mmio = {
 751         .read = { apic_mem_readb, apic_mem_readw, apic_mem_readl, },
 752         .write = { apic_mem_writeb, apic_mem_writew, apic_mem_writel, },
 753     },
 754     .endianness = DEVICE_NATIVE_ENDIAN,
 755 };
 756
 757 static void apic_init(APICCommonState *s)
 758 {
 759     memory_region_init_io(&s->io_memory, &apic_io_ops, s, "apic-msi",
 760                           MSI_SPACE_SIZE);
 761
 762     s->timer = qemu_new_timer_ns(vm_clock, apic_timer, s);
 763     local_apics[s->idx] = s;
 764 }
 765
 766 static void apic_class_init(ObjectClass *klass, void *data)
 767 {
 768     APICCommonClass *k = APIC_COMMON_CLASS(klass);
 769
 770     k->init = apic_init;
 771     k->set_base = apic_set_base;
 772     k->set_tpr = apic_set_tpr;
 773     k->external_nmi = apic_external_nmi;
 774     k->post_load = apic_post_load;
 775 }
 776
 777 static TypeInfo apic_info = {
 778     .name          = "apic",
 779     .instance_size = sizeof(APICCommonState),
 780     .parent        = TYPE_APIC_COMMON,
 781     .class_init    = apic_class_init,
 782 };
 783
 784 static void apic_register_types(void)
 785 {
 786     type_register_static(&apic_info);
 787 }
 788
 789 type_init(apic_register_types)