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