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 "vl.h"
  25
  26 //#define DEBUG_PCI
  27
  28 #define PCI_VENDOR_ID           0x00    /* 16 bits */
  29 #define PCI_DEVICE_ID           0x02    /* 16 bits */
  30 #define PCI_COMMAND             0x04    /* 16 bits */
  31 #define  PCI_COMMAND_IO         0x1     /* Enable response in I/O space */
  32 #define  PCI_COMMAND_MEMORY     0x2     /* Enable response in Memory space */
  33 #define PCI_CLASS_DEVICE        0x0a    /* Device class */
  34 #define PCI_INTERRUPT_LINE      0x3c    /* 8 bits */
  35 #define PCI_INTERRUPT_PIN       0x3d    /* 8 bits */
  36 #define PCI_MIN_GNT             0x3e    /* 8 bits */
  37 #define PCI_MAX_LAT             0x3f    /* 8 bits */
  38
  39 /* just used for simpler irq handling. */
  40 #define PCI_DEVICES_MAX 64
  41 #define PCI_IRQ_WORDS   ((PCI_DEVICES_MAX + 31) / 32)
  42
  43 typedef struct PCIBridge {
  44     uint32_t config_reg;
  45     PCIDevice **pci_bus[256];
  46 } PCIBridge;
  47
  48 static PCIBridge pci_bridge;
  49 target_phys_addr_t pci_mem_base;
  50 static int pci_irq_index;
  51 static uint32_t pci_irq_levels[4][PCI_IRQ_WORDS];
  52
  53 /* -1 for devfn means auto assign */
  54 PCIDevice *pci_register_device(const char *name, int instance_size,
  55                                int bus_num, int devfn,
  56                                PCIConfigReadFunc *config_read,
  57                                PCIConfigWriteFunc *config_write)
  58 {
  59     PCIBridge *s = &pci_bridge;
  60     PCIDevice *pci_dev, **bus;
  61
  62     if (pci_irq_index >= PCI_DEVICES_MAX)
  63         return NULL;
  64
  65     if (!s->pci_bus[bus_num]) {
  66         s->pci_bus[bus_num] = qemu_mallocz(256 * sizeof(PCIDevice *));
  67         if (!s->pci_bus[bus_num])
  68             return NULL;
  69     }
  70     bus = s->pci_bus[bus_num];
  71     if (devfn < 0) {
  72         for(devfn = 0 ; devfn < 256; devfn += 8) {
  73             if (!bus[devfn])
  74                 goto found;
  75         }
  76         return NULL;
  77     found: ;
  78     }
  79     pci_dev = qemu_mallocz(instance_size);
  80     if (!pci_dev)
  81         return NULL;
  82     pci_dev->bus_num = bus_num;
  83     pci_dev->devfn = devfn;
  84     pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
  85
  86     if (!config_read)
  87         config_read = pci_default_read_config;
  88     if (!config_write)
  89         config_write = pci_default_write_config;
  90     pci_dev->config_read = config_read;
  91     pci_dev->config_write = config_write;
  92     pci_dev->irq_index = pci_irq_index++;
  93     bus[devfn] = pci_dev;
  94     return pci_dev;
  95 }
  96
  97 void pci_register_io_region(PCIDevice *pci_dev, int region_num,
  98                             uint32_t size, int type,
  99                             PCIMapIORegionFunc *map_func)
 100 {
 101     PCIIORegion *r;
 102
 103     if ((unsigned int)region_num >= 6)
 104         return;
 105     r = &pci_dev->io_regions[region_num];
 106     r->addr = -1;
 107     r->size = size;
 108     r->type = type;
 109     r->map_func = map_func;
 110 }
 111
 112 static void pci_addr_writel(void* opaque, uint32_t addr, uint32_t val)
 113 {
 114     PCIBridge *s = opaque;
 115     s->config_reg = val;
 116 }
 117
 118 static uint32_t pci_addr_readl(void* opaque, uint32_t addr)
 119 {
 120     PCIBridge *s = opaque;
 121     return s->config_reg;
 122 }
 123
 124 static void pci_update_mappings(PCIDevice *d)
 125 {
 126     PCIIORegion *r;
 127     int cmd, i;
 128     uint32_t last_addr, new_addr;
 129
 130     cmd = le16_to_cpu(*(uint16_t *)(d->config + PCI_COMMAND));
 131     for(i = 0; i < 6; i++) {
 132         r = &d->io_regions[i];
 133         if (r->size != 0) {
 134             if (r->type & PCI_ADDRESS_SPACE_IO) {
 135                 if (cmd & PCI_COMMAND_IO) {
 136                     new_addr = le32_to_cpu(*(uint32_t *)(d->config +
 137                                                          0x10 + i * 4));
 138                     new_addr = new_addr & ~(r->size - 1);
 139                     last_addr = new_addr + r->size - 1;
 140                     /* NOTE: we have only 64K ioports on PC */
 141                     if (last_addr <= new_addr || new_addr == 0 ||
 142                         last_addr >= 0x10000) {
 143                         new_addr = -1;
 144                     }
 145                 } else {
 146                     new_addr = -1;
 147                 }
 148             } else {
 149                 if (cmd & PCI_COMMAND_MEMORY) {
 150                     new_addr = le32_to_cpu(*(uint32_t *)(d->config +
 151                                                          0x10 + i * 4));
 152                     new_addr = new_addr & ~(r->size - 1);
 153                     last_addr = new_addr + r->size - 1;
 154                     /* NOTE: we do not support wrapping */
 155                     /* XXX: as we cannot support really dynamic
 156                        mappings, we handle specific values as invalid
 157                        mappings. */
 158                     if (last_addr <= new_addr || new_addr == 0 ||
 159                         last_addr == -1) {
 160                         new_addr = -1;
 161                     }
 162                 } else {
 163                     new_addr = -1;
 164                 }
 165             }
 166             /* now do the real mapping */
 167             if (new_addr != r->addr) {
 168                 if (r->addr != -1) {
 169                     if (r->type & PCI_ADDRESS_SPACE_IO) {
 170                         int class;
 171                         /* NOTE: specific hack for IDE in PC case:
 172                            only one byte must be mapped. */
 173                         class = d->config[0x0a] | (d->config[0x0b] << 8);
 174                         if (class == 0x0101 && r->size == 4) {
 175                             isa_unassign_ioport(r->addr + 2, 1);
 176                         } else {
 177                             isa_unassign_ioport(r->addr, r->size);
 178                         }
 179                     } else {
 180                         cpu_register_physical_memory(r->addr + pci_mem_base,
 181                                                      r->size,
 182                                                      IO_MEM_UNASSIGNED);
 183                     }
 184                 }
 185                 r->addr = new_addr;
 186                 if (r->addr != -1) {
 187                     r->map_func(d, i, r->addr, r->size, r->type);
 188                 }
 189             }
 190         }
 191     }
 192 }
 193
 194 uint32_t pci_default_read_config(PCIDevice *d,
 195                                  uint32_t address, int len)
 196 {
 197     uint32_t val;
 198     switch(len) {
 199     case 1:
 200         val = d->config[address];
 201         break;
 202     case 2:
 203         val = le16_to_cpu(*(uint16_t *)(d->config + address));
 204         break;
 205     default:
 206     case 4:
 207         val = le32_to_cpu(*(uint32_t *)(d->config + address));
 208         break;
 209     }
 210     return val;
 211 }
 212
 213 void pci_default_write_config(PCIDevice *d,
 214                               uint32_t address, uint32_t val, int len)
 215 {
 216     int can_write, i;
 217     uint32_t end, addr;
 218
 219     if (len == 4 && (address >= 0x10 && address < 0x10 + 4 * 6)) {
 220         PCIIORegion *r;
 221         int reg;
 222
 223         reg = (address - 0x10) >> 2;
 224         r = &d->io_regions[reg];
 225         if (r->size == 0)
 226             goto default_config;
 227         /* compute the stored value */
 228         val &= ~(r->size - 1);
 229         val |= r->type;
 230         *(uint32_t *)(d->config + 0x10 + reg * 4) = cpu_to_le32(val);
 231         pci_update_mappings(d);
 232         return;
 233     }
 234  default_config:
 235     /* not efficient, but simple */
 236     addr = address;
 237     for(i = 0; i < len; i++) {
 238         /* default read/write accesses */
 239         switch(addr) {
 240         case 0x00:
 241         case 0x01:
 242         case 0x02:
 243         case 0x03:
 244         case 0x08:
 245         case 0x09:
 246         case 0x0a:
 247         case 0x0b:
 248         case 0x0e:
 249         case 0x3d:
 250             can_write = 0;
 251             break;
 252         default:
 253             can_write = 1;
 254             break;
 255         }
 256         if (can_write) {
 257             d->config[addr] = val;
 258         }
 259         addr++;
 260         val >>= 8;
 261     }
 262
 263     end = address + len;
 264     if (end > PCI_COMMAND && address < (PCI_COMMAND + 2)) {
 265         /* if the command register is modified, we must modify the mappings */
 266         pci_update_mappings(d);
 267     }
 268 }
 269
 270 static void pci_data_write(void *opaque, uint32_t addr,
 271                            uint32_t val, int len)
 272 {
 273     PCIBridge *s = opaque;
 274     PCIDevice **bus, *pci_dev;
 275     int config_addr;
 276
 277 #if defined(DEBUG_PCI) && 0
 278     printf("pci_data_write: addr=%08x val=%08x len=%d\n",
 279            s->config_reg, val, len);
 280 #endif
 281     if (!(s->config_reg & (1 << 31))) {
 282         return;
 283     }
 284     if ((s->config_reg & 0x3) != 0) {
 285         return;
 286     }
 287     bus = s->pci_bus[(s->config_reg >> 16) & 0xff];
 288     if (!bus)
 289         return;
 290     pci_dev = bus[(s->config_reg >> 8) & 0xff];
 291     if (!pci_dev)
 292         return;
 293     config_addr = (s->config_reg & 0xfc) | (addr & 3);
 294 #if defined(DEBUG_PCI)
 295     printf("pci_config_write: %s: addr=%02x val=%08x len=%d\n",
 296            pci_dev->name, config_addr, val, len);
 297 #endif
 298     pci_dev->config_write(pci_dev, config_addr, val, len);
 299 }
 300
 301 static uint32_t pci_data_read(void *opaque, uint32_t addr,
 302                               int len)
 303 {
 304     PCIBridge *s = opaque;
 305     PCIDevice **bus, *pci_dev;
 306     int config_addr;
 307     uint32_t val;
 308
 309     if (!(s->config_reg & (1 << 31)))
 310         goto fail;
 311     if ((s->config_reg & 0x3) != 0)
 312         goto fail;
 313     bus = s->pci_bus[(s->config_reg >> 16) & 0xff];
 314     if (!bus)
 315         goto fail;
 316     pci_dev = bus[(s->config_reg >> 8) & 0xff];
 317     if (!pci_dev) {
 318     fail:
 319         switch(len) {
 320         case 1:
 321             val = 0xff;
 322             break;
 323         case 2:
 324             val = 0xffff;
 325             break;
 326         default:
 327         case 4:
 328             val = 0xffffffff;
 329             break;
 330         }
 331         goto the_end;
 332     }
 333     config_addr = (s->config_reg & 0xfc) | (addr & 3);
 334     val = pci_dev->config_read(pci_dev, config_addr, len);
 335 #if defined(DEBUG_PCI)
 336     printf("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
 337            pci_dev->name, config_addr, val, len);
 338 #endif
 339  the_end:
 340 #if defined(DEBUG_PCI) && 0
 341     printf("pci_data_read: addr=%08x val=%08x len=%d\n",
 342            s->config_reg, val, len);
 343 #endif
 344     return val;
 345 }
 346
 347 static void pci_data_writeb(void* opaque, uint32_t addr, uint32_t val)
 348 {
 349     pci_data_write(opaque, addr, val, 1);
 350 }
 351
 352 static void pci_data_writew(void* opaque, uint32_t addr, uint32_t val)
 353 {
 354     pci_data_write(opaque, addr, val, 2);
 355 }
 356
 357 static void pci_data_writel(void* opaque, uint32_t addr, uint32_t val)
 358 {
 359     pci_data_write(opaque, addr, val, 4);
 360 }
 361
 362 static uint32_t pci_data_readb(void* opaque, uint32_t addr)
 363 {
 364     return pci_data_read(opaque, addr, 1);
 365 }
 366
 367 static uint32_t pci_data_readw(void* opaque, uint32_t addr)
 368 {
 369     return pci_data_read(opaque, addr, 2);
 370 }
 371
 372 static uint32_t pci_data_readl(void* opaque, uint32_t addr)
 373 {
 374     return pci_data_read(opaque, addr, 4);
 375 }
 376
 377 /* i440FX PCI bridge */
 378
 379 void i440fx_init(void)
 380 {
 381     PCIBridge *s = &pci_bridge;
 382     PCIDevice *d;
 383
 384     register_ioport_write(0xcf8, 4, 4, pci_addr_writel, s);
 385     register_ioport_read(0xcf8, 4, 4, pci_addr_readl, s);
 386
 387     register_ioport_write(0xcfc, 4, 1, pci_data_writeb, s);
 388     register_ioport_write(0xcfc, 4, 2, pci_data_writew, s);
 389     register_ioport_write(0xcfc, 4, 4, pci_data_writel, s);
 390     register_ioport_read(0xcfc, 4, 1, pci_data_readb, s);
 391     register_ioport_read(0xcfc, 4, 2, pci_data_readw, s);
 392     register_ioport_read(0xcfc, 4, 4, pci_data_readl, s);
 393
 394     d = pci_register_device("i440FX", sizeof(PCIDevice), 0, 0,
 395                             NULL, NULL);
 396
 397     d->config[0x00] = 0x86; // vendor_id
 398     d->config[0x01] = 0x80;
 399     d->config[0x02] = 0x37; // device_id
 400     d->config[0x03] = 0x12;
 401     d->config[0x08] = 0x02; // revision
 402     d->config[0x0a] = 0x04; // class_sub = pci2pci
 403     d->config[0x0b] = 0x06; // class_base = PCI_bridge
 404     d->config[0x0c] = 0x01; // line_size in 32 bit words
 405     d->config[0x0e] = 0x01; // header_type
 406 }
 407
 408 /* PIIX3 PCI to ISA bridge */
 409
 410 typedef struct PIIX3State {
 411     PCIDevice dev;
 412 } PIIX3State;
 413
 414 PIIX3State *piix3_state;
 415
 416 static void piix3_reset(PIIX3State *d)
 417 {
 418     uint8_t *pci_conf = d->dev.config;
 419
 420     pci_conf[0x04] = 0x07; // master, memory and I/O
 421     pci_conf[0x05] = 0x00;
 422     pci_conf[0x06] = 0x00;
 423     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
 424     pci_conf[0x4c] = 0x4d;
 425     pci_conf[0x4e] = 0x03;
 426     pci_conf[0x4f] = 0x00;
 427     pci_conf[0x60] = 0x80;
 428     pci_conf[0x69] = 0x02;
 429     pci_conf[0x70] = 0x80;
 430     pci_conf[0x76] = 0x0c;
 431     pci_conf[0x77] = 0x0c;
 432     pci_conf[0x78] = 0x02;
 433     pci_conf[0x79] = 0x00;
 434     pci_conf[0x80] = 0x00;
 435     pci_conf[0x82] = 0x00;
 436     pci_conf[0xa0] = 0x08;
 437     pci_conf[0xa0] = 0x08;
 438     pci_conf[0xa2] = 0x00;
 439     pci_conf[0xa3] = 0x00;
 440     pci_conf[0xa4] = 0x00;
 441     pci_conf[0xa5] = 0x00;
 442     pci_conf[0xa6] = 0x00;
 443     pci_conf[0xa7] = 0x00;
 444     pci_conf[0xa8] = 0x0f;
 445     pci_conf[0xaa] = 0x00;
 446     pci_conf[0xab] = 0x00;
 447     pci_conf[0xac] = 0x00;
 448     pci_conf[0xae] = 0x00;
 449 }
 450
 451 void piix3_init(void)
 452 {
 453     PIIX3State *d;
 454     uint8_t *pci_conf;
 455
 456     d = (PIIX3State *)pci_register_device("PIIX3", sizeof(PIIX3State),
 457                                           0, -1,
 458                                           NULL, NULL);
 459     piix3_state = d;
 460     pci_conf = d->dev.config;
 461
 462     pci_conf[0x00] = 0x86; // Intel
 463     pci_conf[0x01] = 0x80;
 464     pci_conf[0x02] = 0x00; // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
 465     pci_conf[0x03] = 0x70;
 466     pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
 467     pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
 468     pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic
 469
 470     piix3_reset(d);
 471 }
 472
 473 /***********************************************************/
 474 /* generic PCI irq support */
 475
 476 /* return the global irq number corresponding to a given device irq
 477    pin. We could also use the bus number to have a more precise
 478    mapping. */
 479 static inline int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
 480 {
 481     int slot_addend;
 482     slot_addend = (pci_dev->devfn >> 3);
 483     return (irq_num + slot_addend) & 3;
 484 }
 485
 486 /* 0 <= irq_num <= 3. level must be 0 or 1 */
 487 void pci_set_irq(PCIDevice *pci_dev, int irq_num, int level)
 488 {
 489     int irq_index, shift, pic_irq, pic_level;
 490     uint32_t *p;
 491
 492     irq_num = pci_slot_get_pirq(pci_dev, irq_num);
 493     irq_index = pci_dev->irq_index;
 494     p = &pci_irq_levels[irq_num][irq_index >> 5];
 495     shift = (irq_index & 0x1f);
 496     *p = (*p & ~(1 << shift)) | (level << shift);
 497
 498     /* now we change the pic irq level according to the piix irq mappings */
 499     pic_irq = piix3_state->dev.config[0x60 + irq_num];
 500     if (pic_irq < 16) {
 501         /* the pic level is the logical OR of all the PCI irqs mapped
 502            to it */
 503         pic_level = 0;
 504 #if (PCI_IRQ_WORDS == 2)
 505         pic_level = ((pci_irq_levels[irq_num][0] |
 506                       pci_irq_levels[irq_num][1]) != 0);
 507 #else
 508         {
 509             int i;
 510             pic_level = 0;
 511             for(i = 0; i < PCI_IRQ_WORDS; i++) {
 512                 if (pci_irq_levels[irq_num][i]) {
 513                     pic_level = 1;
 514                     break;
 515                 }
 516             }
 517         }
 518 #endif
 519         pic_set_irq(pic_irq, pic_level);
 520     }
 521 }
 522
 523 /***********************************************************/
 524 /* monitor info on PCI */
 525
 526 static void pci_info_device(PCIDevice *d)
 527 {
 528     int i, class;
 529     PCIIORegion *r;
 530
 531     printf("  Bus %2d, device %3d, function %d:\n",
 532            d->bus_num, d->devfn >> 3, d->devfn & 7);
 533     class = le16_to_cpu(*((uint16_t *)(d->config + PCI_CLASS_DEVICE)));
 534     printf("    ");
 535     switch(class) {
 536     case 0x0101:
 537         printf("IDE controller");
 538         break;
 539     case 0x0200:
 540         printf("Ethernet controller");
 541         break;
 542     case 0x0300:
 543         printf("VGA controller");
 544         break;
 545     default:
 546         printf("Class %04x", class);
 547         break;
 548     }
 549     printf(": PCI device %04x:%04x\n",
 550            le16_to_cpu(*((uint16_t *)(d->config + PCI_VENDOR_ID))),
 551            le16_to_cpu(*((uint16_t *)(d->config + PCI_DEVICE_ID))));
 552
 553     if (d->config[PCI_INTERRUPT_PIN] != 0) {
 554         printf("      IRQ %d.\n", d->config[PCI_INTERRUPT_LINE]);
 555     }
 556     for(i = 0;i < 6; i++) {
 557         r = &d->io_regions[i];
 558         if (r->size != 0) {
 559             printf("      BAR%d: ", i);
 560             if (r->type & PCI_ADDRESS_SPACE_IO) {
 561                 printf("I/O at 0x%04x [0x%04x].\n",
 562                        r->addr, r->addr + r->size - 1);
 563             } else {
 564                 printf("32 bit memory at 0x%08x [0x%08x].\n",
 565                        r->addr, r->addr + r->size - 1);
 566             }
 567         }
 568     }
 569 }
 570
 571 void pci_info(void)
 572 {
 573     PCIBridge *s = &pci_bridge;
 574     PCIDevice **bus;
 575     int bus_num, devfn;
 576
 577     for(bus_num = 0; bus_num < 256; bus_num++) {
 578         bus = s->pci_bus[bus_num];
 579         if (bus) {
 580             for(devfn = 0; devfn < 256; devfn++) {
 581                 if (bus[devfn])
 582                     pci_info_device(bus[devfn]);
 583             }
 584         }
 585     }
 586 }
 587
 588 /***********************************************************/
 589 /* XXX: the following should be moved to the PC BIOS */
 590
 591 static uint32_t isa_inb(uint32_t addr)
 592 {
 593     return cpu_inb(cpu_single_env, addr);
 594 }
 595
 596 static void isa_outb(uint32_t val, uint32_t addr)
 597 {
 598     cpu_outb(cpu_single_env, addr, val);
 599 }
 600
 601 static uint32_t isa_inw(uint32_t addr)
 602 {
 603     return cpu_inw(cpu_single_env, addr);
 604 }
 605
 606 static void isa_outw(uint32_t val, uint32_t addr)
 607 {
 608     cpu_outw(cpu_single_env, addr, val);
 609 }
 610
 611 static uint32_t isa_inl(uint32_t addr)
 612 {
 613     return cpu_inl(cpu_single_env, addr);
 614 }
 615
 616 static void isa_outl(uint32_t val, uint32_t addr)
 617 {
 618     cpu_outl(cpu_single_env, addr, val);
 619 }
 620
 621 static void pci_config_writel(PCIDevice *d, uint32_t addr, uint32_t val)
 622 {
 623     PCIBridge *s = &pci_bridge;
 624     s->config_reg = 0x80000000 | (d->bus_num << 16) |
 625         (d->devfn << 8) | addr;
 626     pci_data_write(s, 0, val, 4);
 627 }
 628
 629 static void pci_config_writew(PCIDevice *d, uint32_t addr, uint32_t val)
 630 {
 631     PCIBridge *s = &pci_bridge;
 632     s->config_reg = 0x80000000 | (d->bus_num << 16) |
 633         (d->devfn << 8) | (addr & ~3);
 634     pci_data_write(s, addr & 3, val, 2);
 635 }
 636
 637 static void pci_config_writeb(PCIDevice *d, uint32_t addr, uint32_t val)
 638 {
 639     PCIBridge *s = &pci_bridge;
 640     s->config_reg = 0x80000000 | (d->bus_num << 16) |
 641         (d->devfn << 8) | (addr & ~3);
 642     pci_data_write(s, addr & 3, val, 1);
 643 }
 644
 645 static uint32_t pci_config_readl(PCIDevice *d, uint32_t addr)
 646 {
 647     PCIBridge *s = &pci_bridge;
 648     s->config_reg = 0x80000000 | (d->bus_num << 16) |
 649         (d->devfn << 8) | addr;
 650     return pci_data_read(s, 0, 4);
 651 }
 652
 653 static uint32_t pci_config_readw(PCIDevice *d, uint32_t addr)
 654 {
 655     PCIBridge *s = &pci_bridge;
 656     s->config_reg = 0x80000000 | (d->bus_num << 16) |
 657         (d->devfn << 8) | (addr & ~3);
 658     return pci_data_read(s, addr & 3, 2);
 659 }
 660
 661 static uint32_t pci_config_readb(PCIDevice *d, uint32_t addr)
 662 {
 663     PCIBridge *s = &pci_bridge;
 664     s->config_reg = 0x80000000 | (d->bus_num << 16) |
 665         (d->devfn << 8) | (addr & ~3);
 666     return pci_data_read(s, addr & 3, 1);
 667 }
 668
 669 static uint32_t pci_bios_io_addr;
 670 static uint32_t pci_bios_mem_addr;
 671 /* host irqs corresponding to PCI irqs A-D */
 672 static uint8_t pci_irqs[4] = { 11, 9, 11, 9 };
 673
 674 static void pci_set_io_region_addr(PCIDevice *d, int region_num, uint32_t addr)
 675 {
 676     PCIIORegion *r;
 677     uint16_t cmd;
 678
 679     pci_config_writel(d, 0x10 + region_num * 4, addr);
 680     r = &d->io_regions[region_num];
 681
 682     /* enable memory mappings */
 683     cmd = pci_config_readw(d, PCI_COMMAND);
 684     if (r->type & PCI_ADDRESS_SPACE_IO)
 685         cmd |= 1;
 686     else
 687         cmd |= 2;
 688     pci_config_writew(d, PCI_COMMAND, cmd);
 689 }
 690
 691 static void pci_bios_init_device(PCIDevice *d)
 692 {
 693     int class;
 694     PCIIORegion *r;
 695     uint32_t *paddr;
 696     int i, pin, pic_irq, vendor_id, device_id;
 697
 698     class = pci_config_readw(d, PCI_CLASS_DEVICE);
 699     switch(class) {
 700     case 0x0101:
 701         vendor_id = pci_config_readw(d, PCI_VENDOR_ID);
 702         device_id = pci_config_readw(d, PCI_DEVICE_ID);
 703         if (vendor_id == 0x8086 && device_id == 0x7010) {
 704             /* PIIX3 IDE */
 705             pci_config_writew(d, PCI_COMMAND, PCI_COMMAND_IO);
 706             pci_config_writew(d, 0x40, 0x8000); // enable IDE0
 707         } else {
 708             /* IDE: we map it as in ISA mode */
 709             pci_set_io_region_addr(d, 0, 0x1f0);
 710             pci_set_io_region_addr(d, 1, 0x3f4);
 711             pci_set_io_region_addr(d, 2, 0x170);
 712             pci_set_io_region_addr(d, 3, 0x374);
 713         }
 714         break;
 715     case 0x0300:
 716         /* VGA: map frame buffer to default Bochs VBE address */
 717         pci_set_io_region_addr(d, 0, 0xE0000000);
 718         break;
 719     default:
 720         /* default memory mappings */
 721         for(i = 0; i < 6; i++) {
 722             r = &d->io_regions[i];
 723             if (r->size) {
 724                 if (r->type & PCI_ADDRESS_SPACE_IO)
 725                     paddr = &pci_bios_io_addr;
 726                 else
 727                     paddr = &pci_bios_mem_addr;
 728                 *paddr = (*paddr + r->size - 1) & ~(r->size - 1);
 729                 pci_set_io_region_addr(d, i, *paddr);
 730                 *paddr += r->size;
 731             }
 732         }
 733         break;
 734     }
 735
 736     /* map the interrupt */
 737     pin = pci_config_readb(d, PCI_INTERRUPT_PIN);
 738     if (pin != 0) {
 739         pin = pci_slot_get_pirq(d, pin - 1);
 740         pic_irq = pci_irqs[pin];
 741         pci_config_writeb(d, PCI_INTERRUPT_LINE, pic_irq);
 742     }
 743 }
 744
 745 /*
 746  * This function initializes the PCI devices as a normal PCI BIOS
 747  * would do. It is provided just in case the BIOS has no support for
 748  * PCI.
 749  */
 750 void pci_bios_init(void)
 751 {
 752     PCIBridge *s = &pci_bridge;
 753     PCIDevice **bus;
 754     int bus_num, devfn, i, irq;
 755     uint8_t elcr[2];
 756
 757     pci_bios_io_addr = 0xc000;
 758     pci_bios_mem_addr = 0xf0000000;
 759
 760     /* activate IRQ mappings */
 761     elcr[0] = 0x00;
 762     elcr[1] = 0x00;
 763     for(i = 0; i < 4; i++) {
 764         irq = pci_irqs[i];
 765         /* set to trigger level */
 766         elcr[irq >> 3] |= (1 << (irq & 7));
 767         /* activate irq remapping in PIIX */
 768         pci_config_writeb((PCIDevice *)piix3_state, 0x60 + i, irq);
 769     }
 770     isa_outb(elcr[0], 0x4d0);
 771     isa_outb(elcr[1], 0x4d1);
 772
 773     for(bus_num = 0; bus_num < 256; bus_num++) {
 774         bus = s->pci_bus[bus_num];
 775         if (bus) {
 776             for(devfn = 0; devfn < 256; devfn++) {
 777                 if (bus[devfn])
 778                     pci_bios_init_device(bus[devfn]);
 779             }
 780         }
 781     }
 782 }