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