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