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