hw/pci.c

   1 /*
   2  * QEMU PCI bus manager
   3  *
   4  * Copyright (c) 2004 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "pci.h"
  26 #include "console.h"
  27 #include "net.h"
  28 #include "virtio-net.h"
  29 #include "pc.h"
  30 #include "qemu-kvm.h"
  31 #include "device-assignment.h"
  32
  33 //#define DEBUG_PCI
  34
  35 struct PCIBus {
  36     int bus_num;
  37     int devfn_min;
  38     pci_set_irq_fn set_irq;
  39     pci_map_irq_fn map_irq;
  40     uint32_t config_reg; /* XXX: suppress */
  41     /* low level pic */
  42     SetIRQFunc *low_set_irq;
  43     qemu_irq *irq_opaque;
  44     PCIDevice *devices[256];
  45     PCIDevice *parent_dev;
  46     PCIBus *next;
  47     /* The bus IRQ state is the logical OR of the connected devices.
  48        Keep a count of the number of devices with raised IRQs.  */
  49     int nirq;
  50     int irq_count[];
  51 };
  52
  53 static void pci_update_mappings(PCIDevice *d);
  54 static void pci_set_irq(void *opaque, int irq_num, int level);
  55
  56 target_phys_addr_t pci_mem_base;
  57 static uint16_t pci_default_sub_vendor_id = PCI_SUBVENDOR_ID_REDHAT_QUMRANET;
  58 static uint16_t pci_default_sub_device_id = PCI_SUBDEVICE_ID_QEMU;
  59 static int pci_irq_index;
  60 static PCIBus *first_bus;
  61
  62 static void pcibus_save(QEMUFile *f, void *opaque)
  63 {
  64     PCIBus *bus = (PCIBus *)opaque;
  65     int i;
  66
  67     qemu_put_be32(f, bus->nirq);
  68     for (i = 0; i < bus->nirq; i++)
  69         qemu_put_be32(f, bus->irq_count[i]);
  70 }
  71
  72 static int  pcibus_load(QEMUFile *f, void *opaque, int version_id)
  73 {
  74     PCIBus *bus = (PCIBus *)opaque;
  75     int i, nirq;
  76
  77     if (version_id != 1)
  78         return -EINVAL;
  79
  80     nirq = qemu_get_be32(f);
  81     if (bus->nirq != nirq) {
  82         fprintf(stderr, "pcibus_load: nirq mismatch: src=%d dst=%d\n",
  83                 nirq, bus->nirq);
  84         return -EINVAL;
  85     }
  86
  87     for (i = 0; i < nirq; i++)
  88         bus->irq_count[i] = qemu_get_be32(f);
  89
  90     return 0;
  91 }
  92
  93 PCIBus *pci_register_bus(pci_set_irq_fn set_irq, pci_map_irq_fn map_irq,
  94                          qemu_irq *pic, int devfn_min, int nirq)
  95 {
  96     PCIBus *bus;
  97     static int nbus = 0;
  98
  99     bus = qemu_mallocz(sizeof(PCIBus) + (nirq * sizeof(int)));
 100     bus->set_irq = set_irq;
 101     bus->map_irq = map_irq;
 102     bus->irq_opaque = pic;
 103     bus->devfn_min = devfn_min;
 104     bus->nirq = nirq;
 105     first_bus = bus;
 106     register_savevm("PCIBUS", nbus++, 1, pcibus_save, pcibus_load, bus);
 107     return bus;
 108 }
 109
 110 static PCIBus *pci_register_secondary_bus(PCIDevice *dev, pci_map_irq_fn map_irq)
 111 {
 112     PCIBus *bus;
 113     bus = qemu_mallocz(sizeof(PCIBus));
 114     bus->map_irq = map_irq;
 115     bus->parent_dev = dev;
 116     bus->next = dev->bus->next;
 117     dev->bus->next = bus;
 118     return bus;
 119 }
 120
 121 int pci_bus_num(PCIBus *s)
 122 {
 123     return s->bus_num;
 124 }
 125
 126 void pci_device_save(PCIDevice *s, QEMUFile *f)
 127 {
 128     int i;
 129
 130     qemu_put_be32(f, 2); /* PCI device version */
 131     qemu_put_buffer(f, s->config, 256);
 132     for (i = 0; i < 4; i++)
 133         qemu_put_be32(f, s->irq_state[i]);
 134 }
 135
 136 int pci_device_load(PCIDevice *s, QEMUFile *f)
 137 {
 138     uint32_t version_id;
 139     int i;
 140
 141     version_id = qemu_get_be32(f);
 142     if (version_id > 2)
 143         return -EINVAL;
 144     qemu_get_buffer(f, s->config, 256);
 145     pci_update_mappings(s);
 146
 147     if (version_id >= 2)
 148         for (i = 0; i < 4; i ++)
 149             s->irq_state[i] = qemu_get_be32(f);
 150
 151     return 0;
 152 }
 153
 154 static int pci_set_default_subsystem_id(PCIDevice *pci_dev)
 155 {
 156     uint16_t *id;
 157
 158     id = (void*)(&pci_dev->config[PCI_SUBVENDOR_ID]);
 159     id[0] = cpu_to_le16(pci_default_sub_vendor_id);
 160     id[1] = cpu_to_le16(pci_default_sub_device_id);
 161     return 0;
 162 }
 163
 164 /* -1 for devfn means auto assign */
 165 PCIDevice *pci_register_device(PCIBus *bus, const char *name,
 166                                int instance_size, int devfn,
 167                                PCIConfigReadFunc *config_read,
 168                                PCIConfigWriteFunc *config_write)
 169 {
 170     PCIDevice *pci_dev;
 171
 172     if (pci_irq_index >= PCI_DEVICES_MAX)
 173         return NULL;
 174
 175     if (devfn < 0) {
 176         for(devfn = bus->devfn_min ; devfn < 256; devfn += 8) {
 177             if (!bus->devices[devfn])
 178                 goto found;
 179         }
 180         return NULL;
 181     found: ;
 182     }
 183     pci_dev = qemu_mallocz(instance_size);
 184     if (!pci_dev)
 185         return NULL;
 186     pci_dev->bus = bus;
 187     pci_dev->devfn = devfn;
 188     pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
 189     memset(pci_dev->irq_state, 0, sizeof(pci_dev->irq_state));
 190     pci_set_default_subsystem_id(pci_dev);
 191
 192     if (!config_read)
 193         config_read = pci_default_read_config;
 194     if (!config_write)
 195         config_write = pci_default_write_config;
 196     pci_dev->config_read = config_read;
 197     pci_dev->config_write = config_write;
 198     pci_dev->irq_index = pci_irq_index++;
 199     bus->devices[devfn] = pci_dev;
 200     pci_dev->irq = qemu_allocate_irqs(pci_set_irq, pci_dev, 4);
 201     return pci_dev;
 202 }
 203
 204 static target_phys_addr_t pci_to_cpu_addr(target_phys_addr_t addr)
 205 {
 206     return addr + pci_mem_base;
 207 }
 208
 209 static void pci_unregister_io_regions(PCIDevice *pci_dev)
 210 {
 211     PCIIORegion *r;
 212     int i;
 213
 214     for(i = 0; i < PCI_NUM_REGIONS; i++) {
 215         r = &pci_dev->io_regions[i];
 216         if (!r->size)
 217             continue;
 218         if (r->type == PCI_ADDRESS_SPACE_IO) {
 219             isa_unassign_ioport(r->addr, r->size);
 220         } else {
 221             cpu_register_physical_memory(pci_to_cpu_addr(r->addr),
 222                                                      r->size,
 223                                                      IO_MEM_UNASSIGNED);
 224         }
 225     }
 226 }
 227
 228 int pci_unregister_device(PCIDevice *pci_dev)
 229 {
 230     int ret = 0;
 231
 232     if (pci_dev->unregister)
 233         ret = pci_dev->unregister(pci_dev);
 234     if (ret)
 235         return ret;
 236
 237     pci_unregister_io_regions(pci_dev);
 238
 239     qemu_free_irqs(pci_dev->irq);
 240     pci_irq_index--;
 241     pci_dev->bus->devices[pci_dev->devfn] = NULL;
 242     qemu_free(pci_dev);
 243     return 0;
 244 }
 245
 246 void pci_register_io_region(PCIDevice *pci_dev, int region_num,
 247                             uint32_t size, int type,
 248                             PCIMapIORegionFunc *map_func)
 249 {
 250     PCIIORegion *r;
 251     uint32_t addr;
 252
 253     if ((unsigned int)region_num >= PCI_NUM_REGIONS)
 254         return;
 255
 256     if (size & (size-1))
 257         term_printf("WARNING: PCI region size must be pow2 "
 258                     "type=0x%x, size=0x%x\n", type, size);
 259
 260     r = &pci_dev->io_regions[region_num];
 261     r->addr = -1;
 262     r->size = size;
 263     r->type = type;
 264     r->map_func = map_func;
 265     if (region_num == PCI_ROM_SLOT) {
 266         addr = 0x30;
 267     } else {
 268         addr = 0x10 + region_num * 4;
 269     }
 270     *(uint32_t *)(pci_dev->config + addr) = cpu_to_le32(type);
 271 }
 272
 273
 274 static void pci_update_mappings(PCIDevice *d)
 275 {
 276     PCIIORegion *r;
 277     int cmd, i;
 278     uint32_t last_addr, new_addr, config_ofs;
 279
 280     cmd = le16_to_cpu(*(uint16_t *)(d->config + PCI_COMMAND));
 281     for(i = 0; i < PCI_NUM_REGIONS; i++) {
 282         r = &d->io_regions[i];
 283         if (i == PCI_ROM_SLOT) {
 284             config_ofs = 0x30;
 285         } else {
 286             config_ofs = 0x10 + i * 4;
 287         }
 288         if (r->size != 0) {
 289             if (r->type & PCI_ADDRESS_SPACE_IO) {
 290                 if (cmd & PCI_COMMAND_IO) {
 291                     new_addr = le32_to_cpu(*(uint32_t *)(d->config +
 292                                                          config_ofs));
 293                     new_addr = new_addr & ~(r->size - 1);
 294                     last_addr = new_addr + r->size - 1;
 295                     /* NOTE: we have only 64K ioports on PC */
 296                     if (last_addr <= new_addr || new_addr == 0 ||
 297                         last_addr >= 0x10000) {
 298                         new_addr = -1;
 299                     }
 300                 } else {
 301                     new_addr = -1;
 302                 }
 303             } else {
 304                 if (cmd & PCI_COMMAND_MEMORY) {
 305                     new_addr = le32_to_cpu(*(uint32_t *)(d->config +
 306                                                          config_ofs));
 307                     /* the ROM slot has a specific enable bit */
 308                     if (i == PCI_ROM_SLOT && !(new_addr & 1))
 309                         goto no_mem_map;
 310                     new_addr = new_addr & ~(r->size - 1);
 311                     last_addr = new_addr + r->size - 1;
 312                     /* NOTE: we do not support wrapping */
 313                     /* XXX: as we cannot support really dynamic
 314                        mappings, we handle specific values as invalid
 315                        mappings. */
 316                     if (last_addr <= new_addr || new_addr == 0 ||
 317                         last_addr == -1) {
 318                         new_addr = -1;
 319                     }
 320                 } else {
 321                 no_mem_map:
 322                     new_addr = -1;
 323                 }
 324             }
 325             /* now do the real mapping */
 326             if (new_addr != r->addr) {
 327                 if (r->addr != -1) {
 328                     if (r->type & PCI_ADDRESS_SPACE_IO) {
 329                         int class;
 330                         /* NOTE: specific hack for IDE in PC case:
 331                            only one byte must be mapped. */
 332                         class = d->config[0x0a] | (d->config[0x0b] << 8);
 333                         if (class == 0x0101 && r->size == 4) {
 334                             isa_unassign_ioport(r->addr + 2, 1);
 335                         } else {
 336                             isa_unassign_ioport(r->addr, r->size);
 337                         }
 338                     } else {
 339                         cpu_register_physical_memory(pci_to_cpu_addr(r->addr),
 340                                                      r->size,
 341                                                      IO_MEM_UNASSIGNED);
 342                         qemu_unregister_coalesced_mmio(r->addr, r->size);
 343                     }
 344                 }
 345                 r->addr = new_addr;
 346                 if (r->addr != -1) {
 347                     r->map_func(d, i, r->addr, r->size, r->type);
 348                 }
 349             }
 350         }
 351     }
 352 }
 353
 354 uint32_t pci_default_read_config(PCIDevice *d,
 355                                  uint32_t address, int len)
 356 {
 357     uint32_t val;
 358
 359     switch(len) {
 360     default:
 361     case 4:
 362         if (address <= 0xfc) {
 363             val = le32_to_cpu(*(uint32_t *)(d->config + address));
 364             break;
 365         }
 366         /* fall through */
 367     case 2:
 368         if (address <= 0xfe) {
 369             val = le16_to_cpu(*(uint16_t *)(d->config + address));
 370             break;
 371         }
 372         /* fall through */
 373     case 1:
 374         val = d->config[address];
 375         break;
 376     }
 377     return val;
 378 }
 379
 380 void pci_default_write_config(PCIDevice *d,
 381                               uint32_t address, uint32_t val, int len)
 382 {
 383     int can_write, i;
 384     uint32_t end, addr;
 385
 386     if (len == 4 && ((address >= 0x10 && address < 0x10 + 4 * 6) ||
 387                      (address >= 0x30 && address < 0x34))) {
 388         PCIIORegion *r;
 389         int reg;
 390
 391         if ( address >= 0x30 ) {
 392             reg = PCI_ROM_SLOT;
 393         }else{
 394             reg = (address - 0x10) >> 2;
 395         }
 396         r = &d->io_regions[reg];
 397         if (r->size == 0)
 398             goto default_config;
 399         /* compute the stored value */
 400         if (reg == PCI_ROM_SLOT) {
 401             /* keep ROM enable bit */
 402             val &= (~(r->size - 1)) | 1;
 403         } else {
 404             val &= ~(r->size - 1);
 405             val |= r->type;
 406         }
 407         *(uint32_t *)(d->config + address) = cpu_to_le32(val);
 408         pci_update_mappings(d);
 409         return;
 410     }
 411  default_config:
 412     /* not efficient, but simple */
 413     addr = address;
 414     for(i = 0; i < len; i++) {
 415         /* default read/write accesses */
 416         switch(d->config[0x0e]) {
 417         case 0x00:
 418         case 0x80:
 419             switch(addr) {
 420             case 0x00:
 421             case 0x01:
 422             case 0x02:
 423             case 0x03:
 424             case 0x08:
 425             case 0x09:
 426             case 0x0a:
 427             case 0x0b:
 428             case 0x0e:
 429             case 0x10 ... 0x27: /* base */
 430             case 0x2c ... 0x2f: /* read-only subsystem ID & vendor ID */
 431             case 0x30 ... 0x33: /* rom */
 432             case 0x3d:
 433                 can_write = 0;
 434                 break;
 435             default:
 436                 can_write = 1;
 437                 break;
 438             }
 439             break;
 440         default:
 441         case 0x01:
 442             switch(addr) {
 443             case 0x00:
 444             case 0x01:
 445             case 0x02:
 446             case 0x03:
 447             case 0x08:
 448             case 0x09:
 449             case 0x0a:
 450             case 0x0b:
 451             case 0x0e:
 452             case 0x2c ... 0x2f: /* read-only subsystem ID & vendor ID */
 453             case 0x38 ... 0x3b: /* rom */
 454             case 0x3d:
 455                 can_write = 0;
 456                 break;
 457             default:
 458                 can_write = 1;
 459                 break;
 460             }
 461             break;
 462         }
 463         if (can_write) {
 464             /* Mask out writes to reserved bits in registers */
 465             switch (addr) {
 466             case 0x05:
 467                 val &= ~PCI_COMMAND_RESERVED_MASK_HI;
 468                 break;
 469             case 0x06:
 470                 val &= ~PCI_STATUS_RESERVED_MASK_LO;
 471                 break;
 472             case 0x07:
 473                 val &= ~PCI_STATUS_RESERVED_MASK_HI;
 474                 break;
 475             }
 476             d->config[addr] = val;
 477         }
 478         if (++addr > 0xff)
 479                 break;
 480         val >>= 8;
 481     }
 482
 483 #ifdef USE_KVM_DEVICE_ASSIGNMENT
 484     if (kvm_enabled() && qemu_kvm_irqchip_in_kernel() &&
 485         address >= PIIX_CONFIG_IRQ_ROUTE &&
 486         address < PIIX_CONFIG_IRQ_ROUTE + 4)
 487         assigned_dev_update_irq(d);
 488 #endif /* USE_KVM_DEVICE_ASSIGNMENT */
 489
 490     end = address + len;
 491     if (end > PCI_COMMAND && address < (PCI_COMMAND + 2)) {
 492         /* if the command register is modified, we must modify the mappings */
 493         pci_update_mappings(d);
 494     }
 495 }
 496
 497 void pci_data_write(void *opaque, uint32_t addr, uint32_t val, int len)
 498 {
 499     PCIBus *s = opaque;
 500     PCIDevice *pci_dev;
 501     int config_addr, bus_num;
 502
 503 #if defined(DEBUG_PCI) && 0
 504     printf("pci_data_write: addr=%08x val=%08x len=%d\n",
 505            addr, val, len);
 506 #endif
 507     bus_num = (addr >> 16) & 0xff;
 508     while (s && s->bus_num != bus_num)
 509         s = s->next;
 510     if (!s)
 511         return;
 512     pci_dev = s->devices[(addr >> 8) & 0xff];
 513     if (!pci_dev)
 514         return;
 515     config_addr = addr & 0xff;
 516 #if defined(DEBUG_PCI)
 517     printf("pci_config_write: %s: addr=%02x val=%08x len=%d\n",
 518            pci_dev->name, config_addr, val, len);
 519 #endif
 520     pci_dev->config_write(pci_dev, config_addr, val, len);
 521 }
 522
 523 uint32_t pci_data_read(void *opaque, uint32_t addr, int len)
 524 {
 525     PCIBus *s = opaque;
 526     PCIDevice *pci_dev;
 527     int config_addr, bus_num;
 528     uint32_t val;
 529
 530     bus_num = (addr >> 16) & 0xff;
 531     while (s && s->bus_num != bus_num)
 532         s= s->next;
 533     if (!s)
 534         goto fail;
 535     pci_dev = s->devices[(addr >> 8) & 0xff];
 536     if (!pci_dev) {
 537     fail:
 538         switch(len) {
 539         case 1:
 540             val = 0xff;
 541             break;
 542         case 2:
 543             val = 0xffff;
 544             break;
 545         default:
 546         case 4:
 547             val = 0xffffffff;
 548             break;
 549         }
 550         goto the_end;
 551     }
 552     config_addr = addr & 0xff;
 553     val = pci_dev->config_read(pci_dev, config_addr, len);
 554 #if defined(DEBUG_PCI)
 555     printf("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
 556            pci_dev->name, config_addr, val, len);
 557 #endif
 558  the_end:
 559 #if defined(DEBUG_PCI) && 0
 560     printf("pci_data_read: addr=%08x val=%08x len=%d\n",
 561            addr, val, len);
 562 #endif
 563     return val;
 564 }
 565
 566 /***********************************************************/
 567 /* generic PCI irq support */
 568
 569 /* 0 <= irq_num <= 3. level must be 0 or 1 */
 570 static void pci_set_irq(void *opaque, int irq_num, int level)
 571 {
 572     PCIDevice *pci_dev = (PCIDevice *)opaque;
 573     PCIBus *bus;
 574     int change;
 575
 576     change = level - pci_dev->irq_state[irq_num];
 577     if (!change)
 578         return;
 579
 580     pci_dev->irq_state[irq_num] = level;
 581
 582 #if defined(TARGET_IA64)
 583     ioapic_set_irq(pci_dev, irq_num, level);
 584 #endif
 585
 586     for (;;) {
 587         bus = pci_dev->bus;
 588         irq_num = bus->map_irq(pci_dev, irq_num);
 589         if (bus->set_irq)
 590             break;
 591         pci_dev = bus->parent_dev;
 592     }
 593     bus->irq_count[irq_num] += change;
 594     bus->set_irq(bus->irq_opaque, irq_num, bus->irq_count[irq_num] != 0);
 595 }
 596
 597 int pci_map_irq(PCIDevice *pci_dev, int pin)
 598 {
 599     return pci_dev->bus->map_irq(pci_dev, pin);
 600 }
 601
 602 /***********************************************************/
 603 /* monitor info on PCI */
 604
 605 typedef struct {
 606     uint16_t class;
 607     const char *desc;
 608 } pci_class_desc;
 609
 610 static const pci_class_desc pci_class_descriptions[] =
 611 {
 612     { 0x0100, "SCSI controller"},
 613     { 0x0101, "IDE controller"},
 614     { 0x0102, "Floppy controller"},
 615     { 0x0103, "IPI controller"},
 616     { 0x0104, "RAID controller"},
 617     { 0x0106, "SATA controller"},
 618     { 0x0107, "SAS controller"},
 619     { 0x0180, "Storage controller"},
 620     { 0x0200, "Ethernet controller"},
 621     { 0x0201, "Token Ring controller"},
 622     { 0x0202, "FDDI controller"},
 623     { 0x0203, "ATM controller"},
 624     { 0x0280, "Network controller"},
 625     { 0x0300, "VGA controller"},
 626     { 0x0301, "XGA controller"},
 627     { 0x0302, "3D controller"},
 628     { 0x0380, "Display controller"},
 629     { 0x0400, "Video controller"},
 630     { 0x0401, "Audio controller"},
 631     { 0x0402, "Phone"},
 632     { 0x0480, "Multimedia controller"},
 633     { 0x0500, "RAM controller"},
 634     { 0x0501, "Flash controller"},
 635     { 0x0580, "Memory controller"},
 636     { 0x0600, "Host bridge"},
 637     { 0x0601, "ISA bridge"},
 638     { 0x0602, "EISA bridge"},
 639     { 0x0603, "MC bridge"},
 640     { 0x0604, "PCI bridge"},
 641     { 0x0605, "PCMCIA bridge"},
 642     { 0x0606, "NUBUS bridge"},
 643     { 0x0607, "CARDBUS bridge"},
 644     { 0x0608, "RACEWAY bridge"},
 645     { 0x0680, "Bridge"},
 646     { 0x0c03, "USB controller"},
 647     { 0, NULL}
 648 };
 649
 650 static void pci_info_device(PCIDevice *d)
 651 {
 652     int i, class;
 653     PCIIORegion *r;
 654     const pci_class_desc *desc;
 655
 656     term_printf("  Bus %2d, device %3d, function %d:\n",
 657            d->bus->bus_num, d->devfn >> 3, d->devfn & 7);
 658     class = le16_to_cpu(*((uint16_t *)(d->config + PCI_CLASS_DEVICE)));
 659     term_printf("    ");
 660     desc = pci_class_descriptions;
 661     while (desc->desc && class != desc->class)
 662         desc++;
 663     if (desc->desc) {
 664         term_printf("%s", desc->desc);
 665     } else {
 666         term_printf("Class %04x", class);
 667     }
 668     term_printf(": PCI device %04x:%04x\n",
 669            le16_to_cpu(*((uint16_t *)(d->config + PCI_VENDOR_ID))),
 670            le16_to_cpu(*((uint16_t *)(d->config + PCI_DEVICE_ID))));
 671
 672     if (d->config[PCI_INTERRUPT_PIN] != 0) {
 673         term_printf("      IRQ %d.\n", d->config[PCI_INTERRUPT_LINE]);
 674     }
 675     if (class == 0x0604) {
 676         term_printf("      BUS %d.\n", d->config[0x19]);
 677     }
 678     for(i = 0;i < PCI_NUM_REGIONS; i++) {
 679         r = &d->io_regions[i];
 680         if (r->size != 0) {
 681             term_printf("      BAR%d: ", i);
 682             if (r->type & PCI_ADDRESS_SPACE_IO) {
 683                 term_printf("I/O at 0x%04x [0x%04x].\n",
 684                        r->addr, r->addr + r->size - 1);
 685             } else {
 686                 term_printf("32 bit memory at 0x%08x [0x%08x].\n",
 687                        r->addr, r->addr + r->size - 1);
 688             }
 689         }
 690     }
 691     if (class == 0x0604 && d->config[0x19] != 0) {
 692         pci_for_each_device(d->config[0x19], pci_info_device);
 693     }
 694 }
 695
 696 void pci_for_each_device(int bus_num, void (*fn)(PCIDevice *d))
 697 {
 698     PCIBus *bus = first_bus;
 699     PCIDevice *d;
 700     int devfn;
 701
 702     while (bus && bus->bus_num != bus_num)
 703         bus = bus->next;
 704     if (bus) {
 705         for(devfn = 0; devfn < 256; devfn++) {
 706             d = bus->devices[devfn];
 707             if (d)
 708                 fn(d);
 709         }
 710     }
 711 }
 712
 713 void pci_info(void)
 714 {
 715     pci_for_each_device(0, pci_info_device);
 716 }
 717
 718 static const char * const pci_nic_models[] = {
 719     "ne2k_pci",
 720     "i82551",
 721     "i82557b",
 722     "i82559er",
 723     "rtl8139",
 724     "e1000",
 725     "pcnet",
 726     "virtio",
 727     NULL
 728 };
 729
 730 typedef PCIDevice *(*PCINICInitFn)(PCIBus *, NICInfo *, int);
 731
 732 static PCINICInitFn pci_nic_init_fns[] = {
 733     pci_ne2000_init,
 734     pci_i82551_init,
 735     pci_i82557b_init,
 736     pci_i82559er_init,
 737     pci_rtl8139_init,
 738     pci_e1000_init,
 739     pci_pcnet_init,
 740     virtio_net_init,
 741     NULL
 742 };
 743
 744 /* Initialize a PCI NIC.  */
 745 PCIDevice *pci_nic_init(PCIBus *bus, NICInfo *nd, int devfn,
 746                   const char *default_model)
 747 {
 748     PCIDevice *pci_dev;
 749     int i;
 750
 751     qemu_check_nic_model_list(nd, pci_nic_models, default_model);
 752
 753     for (i = 0; pci_nic_models[i]; i++)
 754         if (strcmp(nd->model, pci_nic_models[i]) == 0) {
 755             pci_dev = pci_nic_init_fns[i](bus, nd, devfn);
 756             if (pci_dev) {
 757                 nd->devfn = pci_dev->devfn;
 758             }
 759             return pci_dev;
 760         }
 761
 762     return NULL;
 763 }
 764
 765 typedef struct {
 766     PCIDevice dev;
 767     PCIBus *bus;
 768 } PCIBridge;
 769
 770 static void pci_bridge_write_config(PCIDevice *d,
 771                              uint32_t address, uint32_t val, int len)
 772 {
 773     PCIBridge *s = (PCIBridge *)d;
 774
 775     if (address == 0x19 || (address == 0x18 && len > 1)) {
 776         if (address == 0x19)
 777             s->bus->bus_num = val & 0xff;
 778         else
 779             s->bus->bus_num = (val >> 8) & 0xff;
 780 #if defined(DEBUG_PCI)
 781         printf ("pci-bridge: %s: Assigned bus %d\n", d->name, s->bus->bus_num);
 782 #endif
 783     }
 784     pci_default_write_config(d, address, val, len);
 785 }
 786
 787 PCIBus *pci_find_bus(int bus_num)
 788 {
 789     PCIBus *bus = first_bus;
 790
 791     while (bus && bus->bus_num != bus_num)
 792         bus = bus->next;
 793
 794     return bus;
 795 }
 796
 797 PCIDevice *pci_find_device(int bus_num, int slot)
 798 {
 799     int devfn;
 800     PCIDevice *d;
 801     PCIBus *bus = pci_find_bus(bus_num);
 802
 803     if (!bus)
 804         return NULL;
 805
 806     for(devfn = 0; devfn < 256; devfn++) {
 807         d = bus->devices[devfn];
 808             if (d && PCI_SLOT(devfn) == slot)
 809                 return d;
 810     }
 811     return NULL;
 812 }
 813
 814 PCIBus *pci_bridge_init(PCIBus *bus, int devfn, uint16_t vid, uint16_t did,
 815                         pci_map_irq_fn map_irq, const char *name)
 816 {
 817     PCIBridge *s;
 818     s = (PCIBridge *)pci_register_device(bus, name, sizeof(PCIBridge),
 819                                          devfn, NULL, pci_bridge_write_config);
 820
 821     pci_config_set_vendor_id(s->dev.config, vid);
 822     pci_config_set_device_id(s->dev.config, did);
 823
 824     s->dev.config[0x04] = 0x06; // command = bus master, pci mem
 825     s->dev.config[0x05] = 0x00;
 826     s->dev.config[0x06] = 0xa0; // status = fast back-to-back, 66MHz, no error
 827     s->dev.config[0x07] = 0x00; // status = fast devsel
 828     s->dev.config[0x08] = 0x00; // revision
 829     s->dev.config[0x09] = 0x00; // programming i/f
 830     pci_config_set_class(s->dev.config, PCI_CLASS_BRIDGE_PCI);
 831     s->dev.config[0x0D] = 0x10; // latency_timer
 832     s->dev.config[0x0E] = 0x81; // header_type
 833     s->dev.config[0x1E] = 0xa0; // secondary status
 834
 835     s->bus = pci_register_secondary_bus(&s->dev, map_irq);
 836     return s->bus;
 837 }