projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
PNP: Lindent all source files
[deliverable/linux.git] / drivers / pnp / pnpbios / rsparser.c
CommitLineData
1da177e4
LT		 1/*
2 * rsparser.c - parses and encodes pnpbios resource data streams
3 *
4 */
5
1da177e4
LT		 6#include <linux/ctype.h>
7#include <linux/pnp.h>
8#include <linux/pnpbios.h>
4e57b681
TS		 9#include <linux/string.h>
10#include <linux/slab.h>
1da177e4
LT		 11
12#ifdef CONFIG_PCI
13#include <linux/pci.h>
14#else
9dd78466
BH		 15inline void pcibios_penalize_isa_irq(int irq, int active)
16{
17}
1da177e4
LT		 18#endif /* CONFIG_PCI */
19
20#include "pnpbios.h"
21
22/* standard resource tags */
23#define SMALL_TAG_PNPVERNO 0x01
24#define SMALL_TAG_LOGDEVID 0x02
25#define SMALL_TAG_COMPATDEVID 0x03
26#define SMALL_TAG_IRQ 0x04
27#define SMALL_TAG_DMA 0x05
28#define SMALL_TAG_STARTDEP 0x06
29#define SMALL_TAG_ENDDEP 0x07
30#define SMALL_TAG_PORT 0x08
31#define SMALL_TAG_FIXEDPORT 0x09
32#define SMALL_TAG_VENDOR 0x0e
33#define SMALL_TAG_END 0x0f
34#define LARGE_TAG 0x80
35#define LARGE_TAG_MEM 0x81
36#define LARGE_TAG_ANSISTR 0x82
37#define LARGE_TAG_UNICODESTR 0x83
38#define LARGE_TAG_VENDOR 0x84
39#define LARGE_TAG_MEM32 0x85
40#define LARGE_TAG_FIXEDMEM32 0x86
41
42/*
43 * Resource Data Stream Format:
44 *
45 * Allocated Resources (required)
46 * end tag ->
47 * Resource Configuration Options (optional)
48 * end tag ->
49 * Compitable Device IDs (optional)
50 * final end tag ->
51 */
52
53/*
54 * Allocated Resources
55 */
56
57static void
9dd78466 58pnpbios_parse_allocated_irqresource(struct pnp_resource_table *res, int irq)
1da177e4
LT		 59{
60 int i = 0;
9dd78466
BH		 61 while (!(res->irq_resource[i].flags & IORESOURCE_UNSET)
62 && i < PNP_MAX_IRQ)
63 i++;
1da177e4 64 if (i < PNP_MAX_IRQ) {
9dd78466 65 res->irq_resource[i].flags = IORESOURCE_IRQ; // Also clears _UNSET flag
1da177e4
LT		 66 if (irq == -1) {
67 res->irq_resource[i].flags |= IORESOURCE_DISABLED;
68 return;
69 }
70 res->irq_resource[i].start =
9dd78466 71 res->irq_resource[i].end = (unsigned long)irq;
c9c3e457 72 pcibios_penalize_isa_irq(irq, 1);
1da177e4
LT		 73 }
74}
75
76static void
9dd78466 77pnpbios_parse_allocated_dmaresource(struct pnp_resource_table *res, int dma)
1da177e4
LT		 78{
79 int i = 0;
6e3e98d1 80 while (i < PNP_MAX_DMA &&
9dd78466 81 !(res->dma_resource[i].flags & IORESOURCE_UNSET))
6e3e98d1 82 i++;
1da177e4 83 if (i < PNP_MAX_DMA) {
9dd78466 84 res->dma_resource[i].flags = IORESOURCE_DMA; // Also clears _UNSET flag
1da177e4
LT		 85 if (dma == -1) {
86 res->dma_resource[i].flags |= IORESOURCE_DISABLED;
87 return;
88 }
89 res->dma_resource[i].start =
9dd78466 90 res->dma_resource[i].end = (unsigned long)dma;
1da177e4
LT		 91 }
92}
93
94static void
9dd78466
BH		 95pnpbios_parse_allocated_ioresource(struct pnp_resource_table *res, int io,
96 int len)
1da177e4
LT		 97{
98 int i = 0;
9dd78466
BH		 99 while (!(res->port_resource[i].flags & IORESOURCE_UNSET)
100 && i < PNP_MAX_PORT)
101 i++;
1da177e4 102 if (i < PNP_MAX_PORT) {
9dd78466
BH		 103 res->port_resource[i].flags = IORESOURCE_IO; // Also clears _UNSET flag
104 if (len <= 0 || (io + len - 1) >= 0x10003) {
1da177e4
LT		 105 res->port_resource[i].flags |= IORESOURCE_DISABLED;
106 return;
107 }
9dd78466 108 res->port_resource[i].start = (unsigned long)io;
1da177e4
LT		 109 res->port_resource[i].end = (unsigned long)(io + len - 1);
110 }
111}
112
113static void
9dd78466
BH		 114pnpbios_parse_allocated_memresource(struct pnp_resource_table *res, int mem,
115 int len)
1da177e4
LT		 116{
117 int i = 0;
9dd78466
BH		 118 while (!(res->mem_resource[i].flags & IORESOURCE_UNSET)
119 && i < PNP_MAX_MEM)
120 i++;
1da177e4 121 if (i < PNP_MAX_MEM) {
9dd78466 122 res->mem_resource[i].flags = IORESOURCE_MEM; // Also clears _UNSET flag
1da177e4
LT		 123 if (len <= 0) {
124 res->mem_resource[i].flags |= IORESOURCE_DISABLED;
125 return;
126 }
9dd78466 127 res->mem_resource[i].start = (unsigned long)mem;
1da177e4
LT		 128 res->mem_resource[i].end = (unsigned long)(mem + len - 1);
129 }
130}
131
9dd78466
BH		 132static unsigned char *pnpbios_parse_allocated_resource_data(unsigned char *p,
133 unsigned char *end,
134 struct
135 pnp_resource_table
136 *res)
1da177e4
LT		 137{
138 unsigned int len, tag;
139 int io, size, mask, i;
140
141 if (!p)
142 return NULL;
143
144 /* Blank the resource table values */
145 pnp_init_resource_table(res);
146
147 while ((char *)p < (char *)end) {
148
149 /* determine the type of tag */
9dd78466 150 if (p[0] & LARGE_TAG) { /* large tag */
1da177e4
LT		 151 len = (p[2] << 8) | p[1];
152 tag = p[0];
9dd78466 153 } else { /* small tag */
1da177e4 154 len = p[0] & 0x07;
9dd78466 155 tag = ((p[0] >> 3) & 0x0f);
1da177e4
LT		 156 }
157
158 switch (tag) {
159
160 case LARGE_TAG_MEM:
161 if (len != 9)
162 goto len_err;
9dd78466
BH		 163 io = *(short *)&p[4];
164 size = *(short *)&p[10];
1da177e4
LT		 165 pnpbios_parse_allocated_memresource(res, io, size);
166 break;
167
168 case LARGE_TAG_ANSISTR:
169 /* ignore this for now */
170 break;
171
172 case LARGE_TAG_VENDOR:
173 /* do nothing */
174 break;
175
176 case LARGE_TAG_MEM32:
177 if (len != 17)
178 goto len_err;
9dd78466
BH		 179 io = *(int *)&p[4];
180 size = *(int *)&p[16];
1da177e4
LT		 181 pnpbios_parse_allocated_memresource(res, io, size);
182 break;
183
184 case LARGE_TAG_FIXEDMEM32:
185 if (len != 9)
186 goto len_err;
9dd78466
BH		 187 io = *(int *)&p[4];
188 size = *(int *)&p[8];
1da177e4
LT		 189 pnpbios_parse_allocated_memresource(res, io, size);
190 break;
191
192 case SMALL_TAG_IRQ:
193 if (len < 2 || len > 3)
194 goto len_err;
195 io = -1;
9dd78466
BH		 196 mask = p[1] + p[2] * 256;
197 for (i = 0; i < 16; i++, mask = mask >> 1)
198 if (mask & 0x01)
199 io = i;
1da177e4
LT		 200 pnpbios_parse_allocated_irqresource(res, io);
201 break;
202
203 case SMALL_TAG_DMA:
204 if (len != 2)
205 goto len_err;
206 io = -1;
207 mask = p[1];
9dd78466
BH		 208 for (i = 0; i < 8; i++, mask = mask >> 1)
209 if (mask & 0x01)
210 io = i;
1da177e4
LT		 211 pnpbios_parse_allocated_dmaresource(res, io);
212 break;
213
214 case SMALL_TAG_PORT:
215 if (len != 7)
216 goto len_err;
9dd78466 217 io = p[2] + p[3] * 256;
1da177e4
LT		 218 size = p[7];
219 pnpbios_parse_allocated_ioresource(res, io, size);
220 break;
221
222 case SMALL_TAG_VENDOR:
223 /* do nothing */
224 break;
225
226 case SMALL_TAG_FIXEDPORT:
227 if (len != 3)
228 goto len_err;
229 io = p[1] + p[2] * 256;
230 size = p[3];
231 pnpbios_parse_allocated_ioresource(res, io, size);
232 break;
233
234 case SMALL_TAG_END:
235 p = p + 2;
9dd78466 236 return (unsigned char *)p;
1da177e4
LT		 237 break;
238
9dd78466
BH		 239 default: /* an unkown tag */
240 len_err:
241 printk(KERN_ERR
242 "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
243 tag, len);
1da177e4
LT		 244 break;
245 }
246
247 /* continue to the next tag */
248 if (p[0] & LARGE_TAG)
249 p += len + 3;
250 else
251 p += len + 1;
252 }
253
9dd78466
BH		 254 printk(KERN_ERR
255 "PnPBIOS: Resource structure does not contain an end tag.\n");
1da177e4
LT		 256
257 return NULL;
258}
259
1da177e4
LT		 260/*
261 * Resource Configuration Options
262 */
263
264static void
265pnpbios_parse_mem_option(unsigned char *p, int size, struct pnp_option *option)
266{
9dd78466 267 struct pnp_mem *mem;
cd861280 268 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
1da177e4
LT		 269 if (!mem)
270 return;
271 mem->min = ((p[5] << 8) | p[4]) << 8;
272 mem->max = ((p[7] << 8) | p[6]) << 8;
273 mem->align = (p[9] << 8) | p[8];
274 mem->size = ((p[11] << 8) | p[10]) << 8;
275 mem->flags = p[3];
9dd78466 276 pnp_register_mem_resource(option, mem);
1da177e4
LT		 277 return;
278}
279
280static void
9dd78466
BH		 281pnpbios_parse_mem32_option(unsigned char *p, int size,
282 struct pnp_option *option)
1da177e4 283{
9dd78466 284 struct pnp_mem *mem;
cd861280 285 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
1da177e4
LT		 286 if (!mem)
287 return;
288 mem->min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
289 mem->max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
290 mem->align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
291 mem->size = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
292 mem->flags = p[3];
9dd78466 293 pnp_register_mem_resource(option, mem);
1da177e4
LT		 294 return;
295}
296
297static void
9dd78466
BH		 298pnpbios_parse_fixed_mem32_option(unsigned char *p, int size,
299 struct pnp_option *option)
1da177e4 300{
9dd78466 301 struct pnp_mem *mem;
cd861280 302 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
1da177e4
LT		 303 if (!mem)
304 return;
305 mem->min = mem->max = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
306 mem->size = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
307 mem->align = 0;
308 mem->flags = p[3];
9dd78466 309 pnp_register_mem_resource(option, mem);
1da177e4
LT		 310 return;
311}
312
313static void
314pnpbios_parse_irq_option(unsigned char *p, int size, struct pnp_option *option)
315{
9dd78466 316 struct pnp_irq *irq;
1da177e4
LT		 317 unsigned long bits;
318
cd861280 319 irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
1da177e4
LT		 320 if (!irq)
321 return;
322 bits = (p[2] << 8) | p[1];
323 bitmap_copy(irq->map, &bits, 16);
324 if (size > 2)
325 irq->flags = p[3];
326 else
327 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
9dd78466 328 pnp_register_irq_resource(option, irq);
1da177e4
LT		 329 return;
330}
331
332static void
333pnpbios_parse_dma_option(unsigned char *p, int size, struct pnp_option *option)
334{
9dd78466 335 struct pnp_dma *dma;
cd861280 336 dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
1da177e4
LT		 337 if (!dma)
338 return;
339 dma->map = p[1];
340 dma->flags = p[2];
9dd78466 341 pnp_register_dma_resource(option, dma);
1da177e4
LT		 342 return;
343}
344
345static void
346pnpbios_parse_port_option(unsigned char *p, int size, struct pnp_option *option)
347{
9dd78466 348 struct pnp_port *port;
cd861280 349 port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
1da177e4
LT		 350 if (!port)
351 return;
352 port->min = (p[3] << 8) | p[2];
353 port->max = (p[5] << 8) | p[4];
354 port->align = p[6];
355 port->size = p[7];
356 port->flags = p[1] ? PNP_PORT_FLAG_16BITADDR : 0;
9dd78466 357 pnp_register_port_resource(option, port);
1da177e4
LT		 358 return;
359}
360
361static void
9dd78466
BH		 362pnpbios_parse_fixed_port_option(unsigned char *p, int size,
363 struct pnp_option *option)
1da177e4 364{
9dd78466 365 struct pnp_port *port;
cd861280 366 port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
1da177e4
LT		 367 if (!port)
368 return;
369 port->min = port->max = (p[2] << 8) | p[1];
370 port->size = p[3];
371 port->align = 0;
372 port->flags = PNP_PORT_FLAG_FIXED;
9dd78466 373 pnp_register_port_resource(option, port);
1da177e4
LT		 374 return;
375}
376
9dd78466
BH		 377static unsigned char *pnpbios_parse_resource_option_data(unsigned char *p,
378 unsigned char *end,
379 struct pnp_dev *dev)
1da177e4
LT		 380{
381 unsigned int len, tag;
382 int priority = 0;
383 struct pnp_option *option, *option_independent;
384
385 if (!p)
386 return NULL;
387
388 option_independent = option = pnp_register_independent_option(dev);
389 if (!option)
390 return NULL;
391
392 while ((char *)p < (char *)end) {
393
394 /* determine the type of tag */
9dd78466 395 if (p[0] & LARGE_TAG) { /* large tag */
1da177e4
LT		 396 len = (p[2] << 8) | p[1];
397 tag = p[0];
9dd78466 398 } else { /* small tag */
1da177e4 399 len = p[0] & 0x07;
9dd78466 400 tag = ((p[0] >> 3) & 0x0f);
1da177e4
LT		 401 }
402
403 switch (tag) {
404
405 case LARGE_TAG_MEM:
406 if (len != 9)
407 goto len_err;
408 pnpbios_parse_mem_option(p, len, option);
409 break;
410
411 case LARGE_TAG_MEM32:
412 if (len != 17)
413 goto len_err;
414 pnpbios_parse_mem32_option(p, len, option);
415 break;
416
417 case LARGE_TAG_FIXEDMEM32:
418 if (len != 9)
419 goto len_err;
420 pnpbios_parse_fixed_mem32_option(p, len, option);
421 break;
422
423 case SMALL_TAG_IRQ:
424 if (len < 2 || len > 3)
425 goto len_err;
426 pnpbios_parse_irq_option(p, len, option);
427 break;
428
429 case SMALL_TAG_DMA:
430 if (len != 2)
431 goto len_err;
432 pnpbios_parse_dma_option(p, len, option);
433 break;
434
435 case SMALL_TAG_PORT:
436 if (len != 7)
437 goto len_err;
438 pnpbios_parse_port_option(p, len, option);
439 break;
440
441 case SMALL_TAG_VENDOR:
442 /* do nothing */
443 break;
444
445 case SMALL_TAG_FIXEDPORT:
446 if (len != 3)
447 goto len_err;
448 pnpbios_parse_fixed_port_option(p, len, option);
449 break;
450
451 case SMALL_TAG_STARTDEP:
452 if (len > 1)
453 goto len_err;
454 priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
455 if (len > 0)
456 priority = 0x100 | p[1];
457 option = pnp_register_dependent_option(dev, priority);
458 if (!option)
459 return NULL;
460 break;
461
462 case SMALL_TAG_ENDDEP:
463 if (len != 0)
464 goto len_err;
465 if (option_independent == option)
9dd78466
BH		 466 printk(KERN_WARNING
467 "PnPBIOS: Missing SMALL_TAG_STARTDEP tag\n");
1da177e4
LT		 468 option = option_independent;
469 break;
470
471 case SMALL_TAG_END:
9dd78466 472 return p + 2;
1da177e4 473
9dd78466
BH		 474 default: /* an unkown tag */
475 len_err:
476 printk(KERN_ERR
477 "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
478 tag, len);
1da177e4
LT		 479 break;
480 }
481
482 /* continue to the next tag */
483 if (p[0] & LARGE_TAG)
484 p += len + 3;
485 else
486 p += len + 1;
487 }
488
9dd78466
BH		 489 printk(KERN_ERR
490 "PnPBIOS: Resource structure does not contain an end tag.\n");
1da177e4
LT		 491
492 return NULL;
493}
494
1da177e4
LT		 495/*
496 * Compatible Device IDs
497 */
498
499#define HEX(id,a) hex[((id)>>a) & 15]
500#define CHAR(id,a) (0x40 + (((id)>>a) & 31))
501//
502
503void pnpid32_to_pnpid(u32 id, char *str)
504{
505 const char *hex = "0123456789abcdef";
506
507 id = be32_to_cpu(id);
508 str[0] = CHAR(id, 26);
509 str[1] = CHAR(id, 21);
9dd78466 510 str[2] = CHAR(id, 16);
1da177e4
LT		 511 str[3] = HEX(id, 12);
512 str[4] = HEX(id, 8);
513 str[5] = HEX(id, 4);
514 str[6] = HEX(id, 0);
515 str[7] = '\0';
516
517 return;
518}
9dd78466 519
1da177e4
LT		 520//
521#undef CHAR
522#undef HEX
523
9dd78466
BH		 524static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
525 unsigned char *end,
526 struct pnp_dev *dev)
1da177e4
LT		 527{
528 int len, tag;
529 char id[8];
530 struct pnp_id *dev_id;
531
532 if (!p)
533 return NULL;
534
535 while ((char *)p < (char *)end) {
536
537 /* determine the type of tag */
9dd78466 538 if (p[0] & LARGE_TAG) { /* large tag */
1da177e4
LT		 539 len = (p[2] << 8) | p[1];
540 tag = p[0];
9dd78466 541 } else { /* small tag */
1da177e4 542 len = p[0] & 0x07;
9dd78466 543 tag = ((p[0] >> 3) & 0x0f);
1da177e4
LT		 544 }
545
546 switch (tag) {
547
548 case LARGE_TAG_ANSISTR:
9dd78466
BH		 549 strncpy(dev->name, p + 3,
550 len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
551 dev->name[len >=
552 PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
1da177e4
LT		 553 break;
554
9dd78466 555 case SMALL_TAG_COMPATDEVID: /* compatible ID */
1da177e4
LT		 556 if (len != 4)
557 goto len_err;
9dd78466 558 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
1da177e4
LT		 559 if (!dev_id)
560 return NULL;
9dd78466
BH		 561 pnpid32_to_pnpid(p[1] | p[2] << 8 | p[3] << 16 | p[4] <<
562 24, id);
1da177e4
LT		 563 memcpy(&dev_id->id, id, 7);
564 pnp_add_id(dev_id, dev);
565 break;
566
567 case SMALL_TAG_END:
568 p = p + 2;
9dd78466 569 return (unsigned char *)p;
1da177e4
LT		 570 break;
571
9dd78466
BH		 572 default: /* an unkown tag */
573 len_err:
574 printk(KERN_ERR
575 "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
576 tag, len);
1da177e4
LT		 577 break;
578 }
579
580 /* continue to the next tag */
581 if (p[0] & LARGE_TAG)
582 p += len + 3;
583 else
584 p += len + 1;
585 }
586
9dd78466
BH		 587 printk(KERN_ERR
588 "PnPBIOS: Resource structure does not contain an end tag.\n");
1da177e4
LT		 589
590 return NULL;
591}
592
1da177e4
LT		 593/*
594 * Allocated Resource Encoding
595 */
596
9dd78466 597static void pnpbios_encode_mem(unsigned char *p, struct resource *res)
1da177e4
LT		 598{
599 unsigned long base = res->start;
600 unsigned long len = res->end - res->start + 1;
601 p[4] = (base >> 8) & 0xff;
602 p[5] = ((base >> 8) >> 8) & 0xff;
603 p[6] = (base >> 8) & 0xff;
604 p[7] = ((base >> 8) >> 8) & 0xff;
605 p[10] = (len >> 8) & 0xff;
606 p[11] = ((len >> 8) >> 8) & 0xff;
607 return;
608}
609
9dd78466 610static void pnpbios_encode_mem32(unsigned char *p, struct resource *res)
1da177e4
LT		 611{
612 unsigned long base = res->start;
613 unsigned long len = res->end - res->start + 1;
614 p[4] = base & 0xff;
615 p[5] = (base >> 8) & 0xff;
616 p[6] = (base >> 16) & 0xff;
617 p[7] = (base >> 24) & 0xff;
618 p[8] = base & 0xff;
619 p[9] = (base >> 8) & 0xff;
620 p[10] = (base >> 16) & 0xff;
621 p[11] = (base >> 24) & 0xff;
622 p[16] = len & 0xff;
623 p[17] = (len >> 8) & 0xff;
624 p[18] = (len >> 16) & 0xff;
625 p[19] = (len >> 24) & 0xff;
626 return;
627}
628
9dd78466
BH		 629static void pnpbios_encode_fixed_mem32(unsigned char *p, struct resource *res)
630{
631 unsigned long base = res->start;
1da177e4
LT		 632 unsigned long len = res->end - res->start + 1;
633 p[4] = base & 0xff;
634 p[5] = (base >> 8) & 0xff;
635 p[6] = (base >> 16) & 0xff;
636 p[7] = (base >> 24) & 0xff;
637 p[8] = len & 0xff;
638 p[9] = (len >> 8) & 0xff;
639 p[10] = (len >> 16) & 0xff;
640 p[11] = (len >> 24) & 0xff;
641 return;
642}
643
9dd78466 644static void pnpbios_encode_irq(unsigned char *p, struct resource *res)
1da177e4
LT		 645{
646 unsigned long map = 0;
647 map = 1 << res->start;
648 p[1] = map & 0xff;
649 p[2] = (map >> 8) & 0xff;
650 return;
651}
652
9dd78466 653static void pnpbios_encode_dma(unsigned char *p, struct resource *res)
1da177e4
LT		 654{
655 unsigned long map = 0;
656 map = 1 << res->start;
657 p[1] = map & 0xff;
658 return;
659}
660
9dd78466 661static void pnpbios_encode_port(unsigned char *p, struct resource *res)
1da177e4
LT		 662{
663 unsigned long base = res->start;
664 unsigned long len = res->end - res->start + 1;
665 p[2] = base & 0xff;
666 p[3] = (base >> 8) & 0xff;
667 p[4] = base & 0xff;
668 p[5] = (base >> 8) & 0xff;
669 p[7] = len & 0xff;
670 return;
671}
672
9dd78466 673static void pnpbios_encode_fixed_port(unsigned char *p, struct resource *res)
1da177e4
LT		 674{
675 unsigned long base = res->start;
676 unsigned long len = res->end - res->start + 1;
677 p[1] = base & 0xff;
678 p[2] = (base >> 8) & 0xff;
679 p[3] = len & 0xff;
680 return;
681}
682
9dd78466
BH		 683static unsigned char *pnpbios_encode_allocated_resource_data(unsigned char *p,
684 unsigned char *end,
685 struct
686 pnp_resource_table
687 *res)
1da177e4
LT		 688{
689 unsigned int len, tag;
690 int port = 0, irq = 0, dma = 0, mem = 0;
691
692 if (!p)
693 return NULL;
694
695 while ((char *)p < (char *)end) {
696
697 /* determine the type of tag */
9dd78466 698 if (p[0] & LARGE_TAG) { /* large tag */
1da177e4
LT		 699 len = (p[2] << 8) | p[1];
700 tag = p[0];
9dd78466 701 } else { /* small tag */
1da177e4 702 len = p[0] & 0x07;
9dd78466 703 tag = ((p[0] >> 3) & 0x0f);
1da177e4
LT		 704 }
705
706 switch (tag) {
707
708 case LARGE_TAG_MEM:
709 if (len != 9)
710 goto len_err;
711 pnpbios_encode_mem(p, &res->mem_resource[mem]);
712 mem++;
713 break;
714
715 case LARGE_TAG_MEM32:
716 if (len != 17)
717 goto len_err;
718 pnpbios_encode_mem32(p, &res->mem_resource[mem]);
719 mem++;
720 break;
721
722 case LARGE_TAG_FIXEDMEM32:
723 if (len != 9)
724 goto len_err;
725 pnpbios_encode_fixed_mem32(p, &res->mem_resource[mem]);
726 mem++;
727 break;
728
729 case SMALL_TAG_IRQ:
730 if (len < 2 || len > 3)
731 goto len_err;
732 pnpbios_encode_irq(p, &res->irq_resource[irq]);
733 irq++;
734 break;
735
736 case SMALL_TAG_DMA:
737 if (len != 2)
738 goto len_err;
739 pnpbios_encode_dma(p, &res->dma_resource[dma]);
740 dma++;
741 break;
742
743 case SMALL_TAG_PORT:
744 if (len != 7)
745 goto len_err;
746 pnpbios_encode_port(p, &res->port_resource[port]);
747 port++;
748 break;
749
750 case SMALL_TAG_VENDOR:
751 /* do nothing */
752 break;
753
754 case SMALL_TAG_FIXEDPORT:
755 if (len != 3)
756 goto len_err;
757 pnpbios_encode_fixed_port(p, &res->port_resource[port]);
758 port++;
759 break;
760
761 case SMALL_TAG_END:
762 p = p + 2;
9dd78466 763 return (unsigned char *)p;
1da177e4
LT		 764 break;
765
9dd78466
BH		 766 default: /* an unkown tag */
767 len_err:
768 printk(KERN_ERR
769 "PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
770 tag, len);
1da177e4
LT		 771 break;
772 }
773
774 /* continue to the next tag */
775 if (p[0] & LARGE_TAG)
776 p += len + 3;
777 else
778 p += len + 1;
779 }
780
9dd78466
BH		 781 printk(KERN_ERR
782 "PnPBIOS: Resource structure does not contain an end tag.\n");
1da177e4
LT		 783
784 return NULL;
785}
786
1da177e4
LT		 787/*
788 * Core Parsing Functions
789 */
790
9dd78466 791int pnpbios_parse_data_stream(struct pnp_dev *dev, struct pnp_bios_node *node)
1da177e4 792{
9dd78466
BH		 793 unsigned char *p = (char *)node->data;
794 unsigned char *end = (char *)(node->data + node->size);
795 p = pnpbios_parse_allocated_resource_data(p, end, &dev->res);
1da177e4
LT		 796 if (!p)
797 return -EIO;
9dd78466 798 p = pnpbios_parse_resource_option_data(p, end, dev);
1da177e4
LT		 799 if (!p)
800 return -EIO;
9dd78466 801 p = pnpbios_parse_compatible_ids(p, end, dev);
1da177e4
LT		 802 if (!p)
803 return -EIO;
804 return 0;
805}
806
807int
808pnpbios_read_resources_from_node(struct pnp_resource_table *res,
9dd78466 809 struct pnp_bios_node *node)
1da177e4 810{
9dd78466
BH		 811 unsigned char *p = (char *)node->data;
812 unsigned char *end = (char *)(node->data + node->size);
813 p = pnpbios_parse_allocated_resource_data(p, end, res);
1da177e4
LT		 814 if (!p)
815 return -EIO;
816 return 0;
817}
818
819int
820pnpbios_write_resources_to_node(struct pnp_resource_table *res,
9dd78466 821 struct pnp_bios_node *node)
1da177e4 822{
9dd78466
BH		 823 unsigned char *p = (char *)node->data;
824 unsigned char *end = (char *)(node->data + node->size);
825 p = pnpbios_encode_allocated_resource_data(p, end, res);
1da177e4
LT		 826 if (!p)
827 return -EIO;
828 return 0;
829}
Linux kernel - Deliverables
This page took 0.43342 seconds and 5 git commands to generate.