Pull bugfix into test branch
[linux-2.6] / 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 = kzalloc(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 = kzalloc(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 = kzalloc(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 = kzalloc(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 = kzalloc(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 = kzalloc(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 = kzalloc(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 =  kzalloc(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 }