git.oblomov.eu Git - linux-2.6/blob - drivers/pnp/pnpbios/rsparser.c

   1 /*
   2  * rsparser.c - parses and encodes pnpbios resource data streams
   3  */
   4
   5 #include <linux/ctype.h>
   6 #include <linux/pnp.h>
   7 #include <linux/pnpbios.h>
   8 #include <linux/string.h>
   9 #include <linux/slab.h>
  10
  11 #ifdef CONFIG_PCI
  12 #include <linux/pci.h>
  13 #else
  14 inline void pcibios_penalize_isa_irq(int irq, int active)
  15 {
  16 }
  17 #endif                          /* CONFIG_PCI */
  18
  19 #include "pnpbios.h"
  20
  21 /* standard resource tags */
  22 #define SMALL_TAG_PNPVERNO              0x01
  23 #define SMALL_TAG_LOGDEVID              0x02
  24 #define SMALL_TAG_COMPATDEVID           0x03
  25 #define SMALL_TAG_IRQ                   0x04
  26 #define SMALL_TAG_DMA                   0x05
  27 #define SMALL_TAG_STARTDEP              0x06
  28 #define SMALL_TAG_ENDDEP                0x07
  29 #define SMALL_TAG_PORT                  0x08
  30 #define SMALL_TAG_FIXEDPORT             0x09
  31 #define SMALL_TAG_VENDOR                0x0e
  32 #define SMALL_TAG_END                   0x0f
  33 #define LARGE_TAG                       0x80
  34 #define LARGE_TAG_MEM                   0x81
  35 #define LARGE_TAG_ANSISTR               0x82
  36 #define LARGE_TAG_UNICODESTR            0x83
  37 #define LARGE_TAG_VENDOR                0x84
  38 #define LARGE_TAG_MEM32                 0x85
  39 #define LARGE_TAG_FIXEDMEM32            0x86
  40
  41 /*
  42  * Resource Data Stream Format:
  43  *
  44  * Allocated Resources (required)
  45  * end tag ->
  46  * Resource Configuration Options (optional)
  47  * end tag ->
  48  * Compitable Device IDs (optional)
  49  * final end tag ->
  50  */
  51
  52 /*
  53  * Allocated Resources
  54  */
  55
  56 static void pnpbios_parse_allocated_irqresource(struct pnp_resource_table *res,
  57                                                 int irq)
  58 {
  59         int i = 0;
  60
  61         while (!(res->irq_resource[i].flags & IORESOURCE_UNSET)
  62                && i < PNP_MAX_IRQ)
  63                 i++;
  64         if (i < PNP_MAX_IRQ) {
  65                 res->irq_resource[i].flags = IORESOURCE_IRQ;    // Also clears _UNSET flag
  66                 if (irq == -1) {
  67                         res->irq_resource[i].flags |= IORESOURCE_DISABLED;
  68                         return;
  69                 }
  70                 res->irq_resource[i].start =
  71                     res->irq_resource[i].end = (unsigned long)irq;
  72                 pcibios_penalize_isa_irq(irq, 1);
  73         }
  74 }
  75
  76 static void pnpbios_parse_allocated_dmaresource(struct pnp_resource_table *res,
  77                                                 int dma)
  78 {
  79         int i = 0;
  80
  81         while (i < PNP_MAX_DMA &&
  82                !(res->dma_resource[i].flags & IORESOURCE_UNSET))
  83                 i++;
  84         if (i < PNP_MAX_DMA) {
  85                 res->dma_resource[i].flags = IORESOURCE_DMA;    // Also clears _UNSET flag
  86                 if (dma == -1) {
  87                         res->dma_resource[i].flags |= IORESOURCE_DISABLED;
  88                         return;
  89                 }
  90                 res->dma_resource[i].start =
  91                     res->dma_resource[i].end = (unsigned long)dma;
  92         }
  93 }
  94
  95 static void pnpbios_parse_allocated_ioresource(struct pnp_resource_table *res,
  96                                                int io, int len)
  97 {
  98         int i = 0;
  99
 100         while (!(res->port_resource[i].flags & IORESOURCE_UNSET)
 101                && i < PNP_MAX_PORT)
 102                 i++;
 103         if (i < PNP_MAX_PORT) {
 104                 res->port_resource[i].flags = IORESOURCE_IO;    // Also clears _UNSET flag
 105                 if (len <= 0 || (io + len - 1) >= 0x10003) {
 106                         res->port_resource[i].flags |= IORESOURCE_DISABLED;
 107                         return;
 108                 }
 109                 res->port_resource[i].start = (unsigned long)io;
 110                 res->port_resource[i].end = (unsigned long)(io + len - 1);
 111         }
 112 }
 113
 114 static void pnpbios_parse_allocated_memresource(struct pnp_resource_table *res,
 115                                                 int mem, int len)
 116 {
 117         int i = 0;
 118
 119         while (!(res->mem_resource[i].flags & IORESOURCE_UNSET)
 120                && i < PNP_MAX_MEM)
 121                 i++;
 122         if (i < PNP_MAX_MEM) {
 123                 res->mem_resource[i].flags = IORESOURCE_MEM;    // Also clears _UNSET flag
 124                 if (len <= 0) {
 125                         res->mem_resource[i].flags |= IORESOURCE_DISABLED;
 126                         return;
 127                 }
 128                 res->mem_resource[i].start = (unsigned long)mem;
 129                 res->mem_resource[i].end = (unsigned long)(mem + len - 1);
 130         }
 131 }
 132
 133 static unsigned char *pnpbios_parse_allocated_resource_data(unsigned char *p,
 134                                                             unsigned char *end,
 135                                                             struct
 136                                                             pnp_resource_table
 137                                                             *res)
 138 {
 139         unsigned int len, tag;
 140         int io, size, mask, i;
 141
 142         if (!p)
 143                 return NULL;
 144
 145         /* Blank the resource table values */
 146         pnp_init_resource_table(res);
 147
 148         while ((char *)p < (char *)end) {
 149
 150                 /* determine the type of tag */
 151                 if (p[0] & LARGE_TAG) { /* large tag */
 152                         len = (p[2] << 8) | p[1];
 153                         tag = p[0];
 154                 } else {        /* small tag */
 155                         len = p[0] & 0x07;
 156                         tag = ((p[0] >> 3) & 0x0f);
 157                 }
 158
 159                 switch (tag) {
 160
 161                 case LARGE_TAG_MEM:
 162                         if (len != 9)
 163                                 goto len_err;
 164                         io = *(short *)&p[4];
 165                         size = *(short *)&p[10];
 166                         pnpbios_parse_allocated_memresource(res, io, size);
 167                         break;
 168
 169                 case LARGE_TAG_ANSISTR:
 170                         /* ignore this for now */
 171                         break;
 172
 173                 case LARGE_TAG_VENDOR:
 174                         /* do nothing */
 175                         break;
 176
 177                 case LARGE_TAG_MEM32:
 178                         if (len != 17)
 179                                 goto len_err;
 180                         io = *(int *)&p[4];
 181                         size = *(int *)&p[16];
 182                         pnpbios_parse_allocated_memresource(res, io, size);
 183                         break;
 184
 185                 case LARGE_TAG_FIXEDMEM32:
 186                         if (len != 9)
 187                                 goto len_err;
 188                         io = *(int *)&p[4];
 189                         size = *(int *)&p[8];
 190                         pnpbios_parse_allocated_memresource(res, io, size);
 191                         break;
 192
 193                 case SMALL_TAG_IRQ:
 194                         if (len < 2 || len > 3)
 195                                 goto len_err;
 196                         io = -1;
 197                         mask = p[1] + p[2] * 256;
 198                         for (i = 0; i < 16; i++, mask = mask >> 1)
 199                                 if (mask & 0x01)
 200                                         io = i;
 201                         pnpbios_parse_allocated_irqresource(res, io);
 202                         break;
 203
 204                 case SMALL_TAG_DMA:
 205                         if (len != 2)
 206                                 goto len_err;
 207                         io = -1;
 208                         mask = p[1];
 209                         for (i = 0; i < 8; i++, mask = mask >> 1)
 210                                 if (mask & 0x01)
 211                                         io = i;
 212                         pnpbios_parse_allocated_dmaresource(res, io);
 213                         break;
 214
 215                 case SMALL_TAG_PORT:
 216                         if (len != 7)
 217                                 goto len_err;
 218                         io = p[2] + p[3] * 256;
 219                         size = p[7];
 220                         pnpbios_parse_allocated_ioresource(res, io, size);
 221                         break;
 222
 223                 case SMALL_TAG_VENDOR:
 224                         /* do nothing */
 225                         break;
 226
 227                 case SMALL_TAG_FIXEDPORT:
 228                         if (len != 3)
 229                                 goto len_err;
 230                         io = p[1] + p[2] * 256;
 231                         size = p[3];
 232                         pnpbios_parse_allocated_ioresource(res, io, size);
 233                         break;
 234
 235                 case SMALL_TAG_END:
 236                         p = p + 2;
 237                         return (unsigned char *)p;
 238                         break;
 239
 240                 default:        /* an unkown tag */
 241                       len_err:
 242                         printk(KERN_ERR
 243                                "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
 244                                tag, len);
 245                         break;
 246                 }
 247
 248                 /* continue to the next tag */
 249                 if (p[0] & LARGE_TAG)
 250                         p += len + 3;
 251                 else
 252                         p += len + 1;
 253         }
 254
 255         printk(KERN_ERR
 256                "PnPBIOS: Resource structure does not contain an end tag.\n");
 257
 258         return NULL;
 259 }
 260
 261 /*
 262  * Resource Configuration Options
 263  */
 264
 265 static void pnpbios_parse_mem_option(unsigned char *p, int size,
 266                                      struct pnp_option *option)
 267 {
 268         struct pnp_mem *mem;
 269
 270         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 271         if (!mem)
 272                 return;
 273         mem->min = ((p[5] << 8) | p[4]) << 8;
 274         mem->max = ((p[7] << 8) | p[6]) << 8;
 275         mem->align = (p[9] << 8) | p[8];
 276         mem->size = ((p[11] << 8) | p[10]) << 8;
 277         mem->flags = p[3];
 278         pnp_register_mem_resource(option, mem);
 279 }
 280
 281 static void pnpbios_parse_mem32_option(unsigned char *p, int size,
 282                                        struct pnp_option *option)
 283 {
 284         struct pnp_mem *mem;
 285
 286         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 287         if (!mem)
 288                 return;
 289         mem->min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
 290         mem->max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
 291         mem->align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
 292         mem->size = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
 293         mem->flags = p[3];
 294         pnp_register_mem_resource(option, mem);
 295 }
 296
 297 static void pnpbios_parse_fixed_mem32_option(unsigned char *p, int size,
 298                                              struct pnp_option *option)
 299 {
 300         struct pnp_mem *mem;
 301         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 302         if (!mem)
 303                 return;
 304         mem->min = mem->max = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
 305         mem->size = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
 306         mem->align = 0;
 307         mem->flags = p[3];
 308         pnp_register_mem_resource(option, mem);
 309 }
 310
 311 static void pnpbios_parse_irq_option(unsigned char *p, int size,
 312                                      struct pnp_option *option)
 313 {
 314         struct pnp_irq *irq;
 315         unsigned long bits;
 316
 317         irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
 318         if (!irq)
 319                 return;
 320         bits = (p[2] << 8) | p[1];
 321         bitmap_copy(irq->map, &bits, 16);
 322         if (size > 2)
 323                 irq->flags = p[3];
 324         else
 325                 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
 326         pnp_register_irq_resource(option, irq);
 327 }
 328
 329 static void pnpbios_parse_dma_option(unsigned char *p, int size,
 330                                      struct pnp_option *option)
 331 {
 332         struct pnp_dma *dma;
 333
 334         dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
 335         if (!dma)
 336                 return;
 337         dma->map = p[1];
 338         dma->flags = p[2];
 339         pnp_register_dma_resource(option, dma);
 340 }
 341
 342 static void pnpbios_parse_port_option(unsigned char *p, int size,
 343                                       struct pnp_option *option)
 344 {
 345         struct pnp_port *port;
 346
 347         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 348         if (!port)
 349                 return;
 350         port->min = (p[3] << 8) | p[2];
 351         port->max = (p[5] << 8) | p[4];
 352         port->align = p[6];
 353         port->size = p[7];
 354         port->flags = p[1] ? PNP_PORT_FLAG_16BITADDR : 0;
 355         pnp_register_port_resource(option, port);
 356 }
 357
 358 static void pnpbios_parse_fixed_port_option(unsigned char *p, int size,
 359                                             struct pnp_option *option)
 360 {
 361         struct pnp_port *port;
 362
 363         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 364         if (!port)
 365                 return;
 366         port->min = port->max = (p[2] << 8) | p[1];
 367         port->size = p[3];
 368         port->align = 0;
 369         port->flags = PNP_PORT_FLAG_FIXED;
 370         pnp_register_port_resource(option, port);
 371 }
 372
 373 static unsigned char *pnpbios_parse_resource_option_data(unsigned char *p,
 374                                                          unsigned char *end,
 375                                                          struct pnp_dev *dev)
 376 {
 377         unsigned int len, tag;
 378         int priority = 0;
 379         struct pnp_option *option, *option_independent;
 380
 381         if (!p)
 382                 return NULL;
 383
 384         option_independent = option = pnp_register_independent_option(dev);
 385         if (!option)
 386                 return NULL;
 387
 388         while ((char *)p < (char *)end) {
 389
 390                 /* determine the type of tag */
 391                 if (p[0] & LARGE_TAG) { /* large tag */
 392                         len = (p[2] << 8) | p[1];
 393                         tag = p[0];
 394                 } else {        /* small tag */
 395                         len = p[0] & 0x07;
 396                         tag = ((p[0] >> 3) & 0x0f);
 397                 }
 398
 399                 switch (tag) {
 400
 401                 case LARGE_TAG_MEM:
 402                         if (len != 9)
 403                                 goto len_err;
 404                         pnpbios_parse_mem_option(p, len, option);
 405                         break;
 406
 407                 case LARGE_TAG_MEM32:
 408                         if (len != 17)
 409                                 goto len_err;
 410                         pnpbios_parse_mem32_option(p, len, option);
 411                         break;
 412
 413                 case LARGE_TAG_FIXEDMEM32:
 414                         if (len != 9)
 415                                 goto len_err;
 416                         pnpbios_parse_fixed_mem32_option(p, len, option);
 417                         break;
 418
 419                 case SMALL_TAG_IRQ:
 420                         if (len < 2 || len > 3)
 421                                 goto len_err;
 422                         pnpbios_parse_irq_option(p, len, option);
 423                         break;
 424
 425                 case SMALL_TAG_DMA:
 426                         if (len != 2)
 427                                 goto len_err;
 428                         pnpbios_parse_dma_option(p, len, option);
 429                         break;
 430
 431                 case SMALL_TAG_PORT:
 432                         if (len != 7)
 433                                 goto len_err;
 434                         pnpbios_parse_port_option(p, len, option);
 435                         break;
 436
 437                 case SMALL_TAG_VENDOR:
 438                         /* do nothing */
 439                         break;
 440
 441                 case SMALL_TAG_FIXEDPORT:
 442                         if (len != 3)
 443                                 goto len_err;
 444                         pnpbios_parse_fixed_port_option(p, len, option);
 445                         break;
 446
 447                 case SMALL_TAG_STARTDEP:
 448                         if (len > 1)
 449                                 goto len_err;
 450                         priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
 451                         if (len > 0)
 452                                 priority = 0x100 | p[1];
 453                         option = pnp_register_dependent_option(dev, priority);
 454                         if (!option)
 455                                 return NULL;
 456                         break;
 457
 458                 case SMALL_TAG_ENDDEP:
 459                         if (len != 0)
 460                                 goto len_err;
 461                         if (option_independent == option)
 462                                 printk(KERN_WARNING
 463                                        "PnPBIOS: Missing SMALL_TAG_STARTDEP tag\n");
 464                         option = option_independent;
 465                         break;
 466
 467                 case SMALL_TAG_END:
 468                         return p + 2;
 469
 470                 default:        /* an unkown tag */
 471                       len_err:
 472                         printk(KERN_ERR
 473                                "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
 474                                tag, len);
 475                         break;
 476                 }
 477
 478                 /* continue to the next tag */
 479                 if (p[0] & LARGE_TAG)
 480                         p += len + 3;
 481                 else
 482                         p += len + 1;
 483         }
 484
 485         printk(KERN_ERR
 486                "PnPBIOS: Resource structure does not contain an end tag.\n");
 487
 488         return NULL;
 489 }
 490
 491 /*
 492  * Compatible Device IDs
 493  */
 494
 495 #define HEX(id,a) hex[((id)>>a) & 15]
 496 #define CHAR(id,a) (0x40 + (((id)>>a) & 31))
 497
 498 void pnpid32_to_pnpid(u32 id, char *str)
 499 {
 500         const char *hex = "0123456789abcdef";
 501
 502         id = be32_to_cpu(id);
 503         str[0] = CHAR(id, 26);
 504         str[1] = CHAR(id, 21);
 505         str[2] = CHAR(id, 16);
 506         str[3] = HEX(id, 12);
 507         str[4] = HEX(id, 8);
 508         str[5] = HEX(id, 4);
 509         str[6] = HEX(id, 0);
 510         str[7] = '\0';
 511 }
 512
 513 #undef CHAR
 514 #undef HEX
 515
 516 static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
 517                                                    unsigned char *end,
 518                                                    struct pnp_dev *dev)
 519 {
 520         int len, tag;
 521         char id[8];
 522         struct pnp_id *dev_id;
 523
 524         if (!p)
 525                 return NULL;
 526
 527         while ((char *)p < (char *)end) {
 528
 529                 /* determine the type of tag */
 530                 if (p[0] & LARGE_TAG) { /* large tag */
 531                         len = (p[2] << 8) | p[1];
 532                         tag = p[0];
 533                 } else {        /* small tag */
 534                         len = p[0] & 0x07;
 535                         tag = ((p[0] >> 3) & 0x0f);
 536                 }
 537
 538                 switch (tag) {
 539
 540                 case LARGE_TAG_ANSISTR:
 541                         strncpy(dev->name, p + 3,
 542                                 len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
 543                         dev->name[len >=
 544                                   PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
 545                         break;
 546
 547                 case SMALL_TAG_COMPATDEVID:     /* compatible ID */
 548                         if (len != 4)
 549                                 goto len_err;
 550                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 551                         if (!dev_id)
 552                                 return NULL;
 553                         pnpid32_to_pnpid(p[1] | p[2] << 8 | p[3] << 16 | p[4] <<
 554                                          24, id);
 555                         memcpy(&dev_id->id, id, 7);
 556                         pnp_add_id(dev_id, dev);
 557                         break;
 558
 559                 case SMALL_TAG_END:
 560                         p = p + 2;
 561                         return (unsigned char *)p;
 562                         break;
 563
 564                 default:        /* an unkown tag */
 565                       len_err:
 566                         printk(KERN_ERR
 567                                "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
 568                                tag, len);
 569                         break;
 570                 }
 571
 572                 /* continue to the next tag */
 573                 if (p[0] & LARGE_TAG)
 574                         p += len + 3;
 575                 else
 576                         p += len + 1;
 577         }
 578
 579         printk(KERN_ERR
 580                "PnPBIOS: Resource structure does not contain an end tag.\n");
 581
 582         return NULL;
 583 }
 584
 585 /*
 586  * Allocated Resource Encoding
 587  */
 588
 589 static void pnpbios_encode_mem(unsigned char *p, struct resource *res)
 590 {
 591         unsigned long base = res->start;
 592         unsigned long len = res->end - res->start + 1;
 593
 594         p[4] = (base >> 8) & 0xff;
 595         p[5] = ((base >> 8) >> 8) & 0xff;
 596         p[6] = (base >> 8) & 0xff;
 597         p[7] = ((base >> 8) >> 8) & 0xff;
 598         p[10] = (len >> 8) & 0xff;
 599         p[11] = ((len >> 8) >> 8) & 0xff;
 600 }
 601
 602 static void pnpbios_encode_mem32(unsigned char *p, struct resource *res)
 603 {
 604         unsigned long base = res->start;
 605         unsigned long len = res->end - res->start + 1;
 606
 607         p[4] = base & 0xff;
 608         p[5] = (base >> 8) & 0xff;
 609         p[6] = (base >> 16) & 0xff;
 610         p[7] = (base >> 24) & 0xff;
 611         p[8] = base & 0xff;
 612         p[9] = (base >> 8) & 0xff;
 613         p[10] = (base >> 16) & 0xff;
 614         p[11] = (base >> 24) & 0xff;
 615         p[16] = len & 0xff;
 616         p[17] = (len >> 8) & 0xff;
 617         p[18] = (len >> 16) & 0xff;
 618         p[19] = (len >> 24) & 0xff;
 619 }
 620
 621 static void pnpbios_encode_fixed_mem32(unsigned char *p, struct resource *res)
 622 {
 623         unsigned long base = res->start;
 624         unsigned long len = res->end - res->start + 1;
 625
 626         p[4] = base & 0xff;
 627         p[5] = (base >> 8) & 0xff;
 628         p[6] = (base >> 16) & 0xff;
 629         p[7] = (base >> 24) & 0xff;
 630         p[8] = len & 0xff;
 631         p[9] = (len >> 8) & 0xff;
 632         p[10] = (len >> 16) & 0xff;
 633         p[11] = (len >> 24) & 0xff;
 634 }
 635
 636 static void pnpbios_encode_irq(unsigned char *p, struct resource *res)
 637 {
 638         unsigned long map = 0;
 639
 640         map = 1 << res->start;
 641         p[1] = map & 0xff;
 642         p[2] = (map >> 8) & 0xff;
 643 }
 644
 645 static void pnpbios_encode_dma(unsigned char *p, struct resource *res)
 646 {
 647         unsigned long map = 0;
 648
 649         map = 1 << res->start;
 650         p[1] = map & 0xff;
 651 }
 652
 653 static void pnpbios_encode_port(unsigned char *p, struct resource *res)
 654 {
 655         unsigned long base = res->start;
 656         unsigned long len = res->end - res->start + 1;
 657
 658         p[2] = base & 0xff;
 659         p[3] = (base >> 8) & 0xff;
 660         p[4] = base & 0xff;
 661         p[5] = (base >> 8) & 0xff;
 662         p[7] = len & 0xff;
 663 }
 664
 665 static void pnpbios_encode_fixed_port(unsigned char *p, struct resource *res)
 666 {
 667         unsigned long base = res->start;
 668         unsigned long len = res->end - res->start + 1;
 669
 670         p[1] = base & 0xff;
 671         p[2] = (base >> 8) & 0xff;
 672         p[3] = len & 0xff;
 673 }
 674
 675 static unsigned char *pnpbios_encode_allocated_resource_data(unsigned char *p,
 676                                                              unsigned char *end,
 677                                                              struct
 678                                                              pnp_resource_table
 679                                                              *res)
 680 {
 681         unsigned int len, tag;
 682         int port = 0, irq = 0, dma = 0, mem = 0;
 683
 684         if (!p)
 685                 return NULL;
 686
 687         while ((char *)p < (char *)end) {
 688
 689                 /* determine the type of tag */
 690                 if (p[0] & LARGE_TAG) { /* large tag */
 691                         len = (p[2] << 8) | p[1];
 692                         tag = p[0];
 693                 } else {        /* small tag */
 694                         len = p[0] & 0x07;
 695                         tag = ((p[0] >> 3) & 0x0f);
 696                 }
 697
 698                 switch (tag) {
 699
 700                 case LARGE_TAG_MEM:
 701                         if (len != 9)
 702                                 goto len_err;
 703                         pnpbios_encode_mem(p, &res->mem_resource[mem]);
 704                         mem++;
 705                         break;
 706
 707                 case LARGE_TAG_MEM32:
 708                         if (len != 17)
 709                                 goto len_err;
 710                         pnpbios_encode_mem32(p, &res->mem_resource[mem]);
 711                         mem++;
 712                         break;
 713
 714                 case LARGE_TAG_FIXEDMEM32:
 715                         if (len != 9)
 716                                 goto len_err;
 717                         pnpbios_encode_fixed_mem32(p, &res->mem_resource[mem]);
 718                         mem++;
 719                         break;
 720
 721                 case SMALL_TAG_IRQ:
 722                         if (len < 2 || len > 3)
 723                                 goto len_err;
 724                         pnpbios_encode_irq(p, &res->irq_resource[irq]);
 725                         irq++;
 726                         break;
 727
 728                 case SMALL_TAG_DMA:
 729                         if (len != 2)
 730                                 goto len_err;
 731                         pnpbios_encode_dma(p, &res->dma_resource[dma]);
 732                         dma++;
 733                         break;
 734
 735                 case SMALL_TAG_PORT:
 736                         if (len != 7)
 737                                 goto len_err;
 738                         pnpbios_encode_port(p, &res->port_resource[port]);
 739                         port++;
 740                         break;
 741
 742                 case SMALL_TAG_VENDOR:
 743                         /* do nothing */
 744                         break;
 745
 746                 case SMALL_TAG_FIXEDPORT:
 747                         if (len != 3)
 748                                 goto len_err;
 749                         pnpbios_encode_fixed_port(p, &res->port_resource[port]);
 750                         port++;
 751                         break;
 752
 753                 case SMALL_TAG_END:
 754                         p = p + 2;
 755                         return (unsigned char *)p;
 756                         break;
 757
 758                 default:        /* an unkown tag */
 759                       len_err:
 760                         printk(KERN_ERR
 761                                "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
 762                                tag, len);
 763                         break;
 764                 }
 765
 766                 /* continue to the next tag */
 767                 if (p[0] & LARGE_TAG)
 768                         p += len + 3;
 769                 else
 770                         p += len + 1;
 771         }
 772
 773         printk(KERN_ERR
 774                "PnPBIOS: Resource structure does not contain an end tag.\n");
 775
 776         return NULL;
 777 }
 778
 779 /*
 780  * Core Parsing Functions
 781  */
 782
 783 int pnpbios_parse_data_stream(struct pnp_dev *dev, struct pnp_bios_node *node)
 784 {
 785         unsigned char *p = (char *)node->data;
 786         unsigned char *end = (char *)(node->data + node->size);
 787
 788         p = pnpbios_parse_allocated_resource_data(p, end, &dev->res);
 789         if (!p)
 790                 return -EIO;
 791         p = pnpbios_parse_resource_option_data(p, end, dev);
 792         if (!p)
 793                 return -EIO;
 794         p = pnpbios_parse_compatible_ids(p, end, dev);
 795         if (!p)
 796                 return -EIO;
 797         return 0;
 798 }
 799
 800 int pnpbios_read_resources_from_node(struct pnp_resource_table *res,
 801                                      struct pnp_bios_node *node)
 802 {
 803         unsigned char *p = (char *)node->data;
 804         unsigned char *end = (char *)(node->data + node->size);
 805
 806         p = pnpbios_parse_allocated_resource_data(p, end, res);
 807         if (!p)
 808                 return -EIO;
 809         return 0;
 810 }
 811
 812 int pnpbios_write_resources_to_node(struct pnp_resource_table *res,
 813                                     struct pnp_bios_node *node)
 814 {
 815         unsigned char *p = (char *)node->data;
 816         unsigned char *end = (char *)(node->data + node->size);
 817
 818         p = pnpbios_encode_allocated_resource_data(p, end, res);
 819         if (!p)
 820                 return -EIO;
 821         return 0;
 822 }