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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * rsparser.c - parses and encodes pnpbios resource data streams
4 */
5
6#include <linux/ctype.h>
7#include <linux/pnp.h>
8#include <linux/string.h>
9
10#ifdef CONFIG_PCI
11#include <linux/pci.h>
12#else
13inline void pcibios_penalize_isa_irq(int irq, int active)
14{
15}
16#endif /* CONFIG_PCI */
17
18#include "../base.h"
19#include "pnpbios.h"
20
21/* standard resource tags */
22#define SMALL_TAG_PNPVERNO 0x01
23#define SMALL_TAG_LOGDEVID 0x02
24#define SMALL_TAG_COMPATDEVID 0x03
25#define SMALL_TAG_IRQ 0x04
26#define SMALL_TAG_DMA 0x05
27#define SMALL_TAG_STARTDEP 0x06
28#define SMALL_TAG_ENDDEP 0x07
29#define SMALL_TAG_PORT 0x08
30#define SMALL_TAG_FIXEDPORT 0x09
31#define SMALL_TAG_VENDOR 0x0e
32#define SMALL_TAG_END 0x0f
33#define LARGE_TAG 0x80
34#define LARGE_TAG_MEM 0x81
35#define LARGE_TAG_ANSISTR 0x82
36#define LARGE_TAG_UNICODESTR 0x83
37#define LARGE_TAG_VENDOR 0x84
38#define LARGE_TAG_MEM32 0x85
39#define LARGE_TAG_FIXEDMEM32 0x86
40
41/*
42 * Resource Data Stream Format:
43 *
44 * Allocated Resources (required)
45 * end tag ->
46 * Resource Configuration Options (optional)
47 * end tag ->
48 * Compitable Device IDs (optional)
49 * final end tag ->
50 */
51
52/*
53 * Allocated Resources
54 */
55
56static void pnpbios_parse_allocated_ioresource(struct pnp_dev *dev,
57 int start, int len)
58{
59 int flags = 0;
60 int end = start + len - 1;
61
62 if (len <= 0 || end >= 0x10003)
63 flags |= IORESOURCE_DISABLED;
64
65 pnp_add_io_resource(dev, start, end, flags);
66}
67
68static void pnpbios_parse_allocated_memresource(struct pnp_dev *dev,
69 int start, int len)
70{
71 int flags = 0;
72 int end = start + len - 1;
73
74 if (len <= 0)
75 flags |= IORESOURCE_DISABLED;
76
77 pnp_add_mem_resource(dev, start, end, flags);
78}
79
80static unsigned char *pnpbios_parse_allocated_resource_data(struct pnp_dev *dev,
81 unsigned char *p,
82 unsigned char *end)
83{
84 unsigned int len, tag;
85 int io, size, mask, i, flags;
86
87 if (!p)
88 return NULL;
89
90 pnp_dbg(&dev->dev, "parse allocated resources\n");
91
92 pnp_init_resources(dev);
93
94 while ((char *)p < (char *)end) {
95
96 /* determine the type of tag */
97 if (p[0] & LARGE_TAG) { /* large tag */
98 len = (p[2] << 8) | p[1];
99 tag = p[0];
100 } else { /* small tag */
101 len = p[0] & 0x07;
102 tag = ((p[0] >> 3) & 0x0f);
103 }
104
105 switch (tag) {
106
107 case LARGE_TAG_MEM:
108 if (len != 9)
109 goto len_err;
110 io = *(short *)&p[4];
111 size = *(short *)&p[10];
112 pnpbios_parse_allocated_memresource(dev, io, size);
113 break;
114
115 case LARGE_TAG_ANSISTR:
116 /* ignore this for now */
117 break;
118
119 case LARGE_TAG_VENDOR:
120 /* do nothing */
121 break;
122
123 case LARGE_TAG_MEM32:
124 if (len != 17)
125 goto len_err;
126 io = *(int *)&p[4];
127 size = *(int *)&p[16];
128 pnpbios_parse_allocated_memresource(dev, io, size);
129 break;
130
131 case LARGE_TAG_FIXEDMEM32:
132 if (len != 9)
133 goto len_err;
134 io = *(int *)&p[4];
135 size = *(int *)&p[8];
136 pnpbios_parse_allocated_memresource(dev, io, size);
137 break;
138
139 case SMALL_TAG_IRQ:
140 if (len < 2 || len > 3)
141 goto len_err;
142 flags = 0;
143 io = -1;
144 mask = p[1] + p[2] * 256;
145 for (i = 0; i < 16; i++, mask = mask >> 1)
146 if (mask & 0x01)
147 io = i;
148 if (io != -1)
149 pcibios_penalize_isa_irq(io, 1);
150 else
151 flags = IORESOURCE_DISABLED;
152 pnp_add_irq_resource(dev, io, flags);
153 break;
154
155 case SMALL_TAG_DMA:
156 if (len != 2)
157 goto len_err;
158 flags = 0;
159 io = -1;
160 mask = p[1];
161 for (i = 0; i < 8; i++, mask = mask >> 1)
162 if (mask & 0x01)
163 io = i;
164 if (io == -1)
165 flags = IORESOURCE_DISABLED;
166 pnp_add_dma_resource(dev, io, flags);
167 break;
168
169 case SMALL_TAG_PORT:
170 if (len != 7)
171 goto len_err;
172 io = p[2] + p[3] * 256;
173 size = p[7];
174 pnpbios_parse_allocated_ioresource(dev, io, size);
175 break;
176
177 case SMALL_TAG_VENDOR:
178 /* do nothing */
179 break;
180
181 case SMALL_TAG_FIXEDPORT:
182 if (len != 3)
183 goto len_err;
184 io = p[1] + p[2] * 256;
185 size = p[3];
186 pnpbios_parse_allocated_ioresource(dev, io, size);
187 break;
188
189 case SMALL_TAG_END:
190 p = p + 2;
191 return (unsigned char *)p;
192 break;
193
194 default: /* an unknown tag */
195len_err:
196 dev_err(&dev->dev, "unknown tag %#x length %d\n",
197 tag, len);
198 break;
199 }
200
201 /* continue to the next tag */
202 if (p[0] & LARGE_TAG)
203 p += len + 3;
204 else
205 p += len + 1;
206 }
207
208 dev_err(&dev->dev, "no end tag in resource structure\n");
209
210 return NULL;
211}
212
213/*
214 * Resource Configuration Options
215 */
216
217static __init void pnpbios_parse_mem_option(struct pnp_dev *dev,
218 unsigned char *p, int size,
219 unsigned int option_flags)
220{
221 resource_size_t min, max, align, len;
222 unsigned char flags;
223
224 min = ((p[5] << 8) | p[4]) << 8;
225 max = ((p[7] << 8) | p[6]) << 8;
226 align = (p[9] << 8) | p[8];
227 len = ((p[11] << 8) | p[10]) << 8;
228 flags = p[3];
229 pnp_register_mem_resource(dev, option_flags, min, max, align, len,
230 flags);
231}
232
233static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
234 unsigned char *p, int size,
235 unsigned int option_flags)
236{
237 resource_size_t min, max, align, len;
238 unsigned char flags;
239
240 min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
241 max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
242 align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
243 len = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
244 flags = p[3];
245 pnp_register_mem_resource(dev, option_flags, min, max, align, len,
246 flags);
247}
248
249static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
250 unsigned char *p, int size,
251 unsigned int option_flags)
252{
253 resource_size_t base, len;
254 unsigned char flags;
255
256 base = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
257 len = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
258 flags = p[3];
259 pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
260}
261
262static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
263 unsigned char *p, int size,
264 unsigned int option_flags)
265{
266 unsigned long bits;
267 pnp_irq_mask_t map;
268 unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
269
270 bits = (p[2] << 8) | p[1];
271
272 bitmap_zero(map.bits, PNP_IRQ_NR);
273 bitmap_copy(map.bits, &bits, 16);
274
275 if (size > 2)
276 flags = p[3];
277
278 pnp_register_irq_resource(dev, option_flags, &map, flags);
279}
280
281static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
282 unsigned char *p, int size,
283 unsigned int option_flags)
284{
285 pnp_register_dma_resource(dev, option_flags, p[1], p[2]);
286}
287
288static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
289 unsigned char *p, int size,
290 unsigned int option_flags)
291{
292 resource_size_t min, max, align, len;
293 unsigned char flags;
294
295 min = (p[3] << 8) | p[2];
296 max = (p[5] << 8) | p[4];
297 align = p[6];
298 len = p[7];
299 flags = p[1] ? IORESOURCE_IO_16BIT_ADDR : 0;
300 pnp_register_port_resource(dev, option_flags, min, max, align, len,
301 flags);
302}
303
304static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
305 unsigned char *p, int size,
306 unsigned int option_flags)
307{
308 resource_size_t base, len;
309
310 base = (p[2] << 8) | p[1];
311 len = p[3];
312 pnp_register_port_resource(dev, option_flags, base, base, 0, len,
313 IORESOURCE_IO_FIXED);
314}
315
316static __init unsigned char *
317pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
318 struct pnp_dev *dev)
319{
320 unsigned int len, tag;
321 int priority;
322 unsigned int option_flags;
323
324 if (!p)
325 return NULL;
326
327 pnp_dbg(&dev->dev, "parse resource options\n");
328 option_flags = 0;
329 while ((char *)p < (char *)end) {
330
331 /* determine the type of tag */
332 if (p[0] & LARGE_TAG) { /* large tag */
333 len = (p[2] << 8) | p[1];
334 tag = p[0];
335 } else { /* small tag */
336 len = p[0] & 0x07;
337 tag = ((p[0] >> 3) & 0x0f);
338 }
339
340 switch (tag) {
341
342 case LARGE_TAG_MEM:
343 if (len != 9)
344 goto len_err;
345 pnpbios_parse_mem_option(dev, p, len, option_flags);
346 break;
347
348 case LARGE_TAG_MEM32:
349 if (len != 17)
350 goto len_err;
351 pnpbios_parse_mem32_option(dev, p, len, option_flags);
352 break;
353
354 case LARGE_TAG_FIXEDMEM32:
355 if (len != 9)
356 goto len_err;
357 pnpbios_parse_fixed_mem32_option(dev, p, len,
358 option_flags);
359 break;
360
361 case SMALL_TAG_IRQ:
362 if (len < 2 || len > 3)
363 goto len_err;
364 pnpbios_parse_irq_option(dev, p, len, option_flags);
365 break;
366
367 case SMALL_TAG_DMA:
368 if (len != 2)
369 goto len_err;
370 pnpbios_parse_dma_option(dev, p, len, option_flags);
371 break;
372
373 case SMALL_TAG_PORT:
374 if (len != 7)
375 goto len_err;
376 pnpbios_parse_port_option(dev, p, len, option_flags);
377 break;
378
379 case SMALL_TAG_VENDOR:
380 /* do nothing */
381 break;
382
383 case SMALL_TAG_FIXEDPORT:
384 if (len != 3)
385 goto len_err;
386 pnpbios_parse_fixed_port_option(dev, p, len,
387 option_flags);
388 break;
389
390 case SMALL_TAG_STARTDEP:
391 if (len > 1)
392 goto len_err;
393 priority = PNP_RES_PRIORITY_ACCEPTABLE;
394 if (len > 0)
395 priority = p[1];
396 option_flags = pnp_new_dependent_set(dev, priority);
397 break;
398
399 case SMALL_TAG_ENDDEP:
400 if (len != 0)
401 goto len_err;
402 option_flags = 0;
403 break;
404
405 case SMALL_TAG_END:
406 return p + 2;
407
408 default: /* an unknown tag */
409len_err:
410 dev_err(&dev->dev, "unknown tag %#x length %d\n",
411 tag, len);
412 break;
413 }
414
415 /* continue to the next tag */
416 if (p[0] & LARGE_TAG)
417 p += len + 3;
418 else
419 p += len + 1;
420 }
421
422 dev_err(&dev->dev, "no end tag in resource structure\n");
423
424 return NULL;
425}
426
427/*
428 * Compatible Device IDs
429 */
430
431static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
432 unsigned char *end,
433 struct pnp_dev *dev)
434{
435 int len, tag;
436 u32 eisa_id;
437 char id[8];
438 struct pnp_id *dev_id;
439
440 if (!p)
441 return NULL;
442
443 while ((char *)p < (char *)end) {
444
445 /* determine the type of tag */
446 if (p[0] & LARGE_TAG) { /* large tag */
447 len = (p[2] << 8) | p[1];
448 tag = p[0];
449 } else { /* small tag */
450 len = p[0] & 0x07;
451 tag = ((p[0] >> 3) & 0x0f);
452 }
453
454 switch (tag) {
455
456 case LARGE_TAG_ANSISTR:
457 strncpy(dev->name, p + 3,
458 len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
459 dev->name[len >=
460 PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
461 break;
462
463 case SMALL_TAG_COMPATDEVID: /* compatible ID */
464 if (len != 4)
465 goto len_err;
466 eisa_id = p[1] | p[2] << 8 | p[3] << 16 | p[4] << 24;
467 pnp_eisa_id_to_string(eisa_id & PNP_EISA_ID_MASK, id);
468 dev_id = pnp_add_id(dev, id);
469 if (!dev_id)
470 return NULL;
471 break;
472
473 case SMALL_TAG_END:
474 p = p + 2;
475 return (unsigned char *)p;
476 break;
477
478 default: /* an unknown tag */
479len_err:
480 dev_err(&dev->dev, "unknown tag %#x length %d\n",
481 tag, len);
482 break;
483 }
484
485 /* continue to the next tag */
486 if (p[0] & LARGE_TAG)
487 p += len + 3;
488 else
489 p += len + 1;
490 }
491
492 dev_err(&dev->dev, "no end tag in resource structure\n");
493
494 return NULL;
495}
496
497/*
498 * Allocated Resource Encoding
499 */
500
501static void pnpbios_encode_mem(struct pnp_dev *dev, unsigned char *p,
502 struct resource *res)
503{
504 unsigned long base;
505 unsigned long len;
506
507 if (pnp_resource_enabled(res)) {
508 base = res->start;
509 len = resource_size(res);
510 } else {
511 base = 0;
512 len = 0;
513 }
514
515 p[4] = (base >> 8) & 0xff;
516 p[5] = ((base >> 8) >> 8) & 0xff;
517 p[6] = (base >> 8) & 0xff;
518 p[7] = ((base >> 8) >> 8) & 0xff;
519 p[10] = (len >> 8) & 0xff;
520 p[11] = ((len >> 8) >> 8) & 0xff;
521
522 pnp_dbg(&dev->dev, " encode mem %#lx-%#lx\n", base, base + len - 1);
523}
524
525static void pnpbios_encode_mem32(struct pnp_dev *dev, unsigned char *p,
526 struct resource *res)
527{
528 unsigned long base;
529 unsigned long len;
530
531 if (pnp_resource_enabled(res)) {
532 base = res->start;
533 len = resource_size(res);
534 } else {
535 base = 0;
536 len = 0;
537 }
538
539 p[4] = base & 0xff;
540 p[5] = (base >> 8) & 0xff;
541 p[6] = (base >> 16) & 0xff;
542 p[7] = (base >> 24) & 0xff;
543 p[8] = base & 0xff;
544 p[9] = (base >> 8) & 0xff;
545 p[10] = (base >> 16) & 0xff;
546 p[11] = (base >> 24) & 0xff;
547 p[16] = len & 0xff;
548 p[17] = (len >> 8) & 0xff;
549 p[18] = (len >> 16) & 0xff;
550 p[19] = (len >> 24) & 0xff;
551
552 pnp_dbg(&dev->dev, " encode mem32 %#lx-%#lx\n", base, base + len - 1);
553}
554
555static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, unsigned char *p,
556 struct resource *res)
557{
558 unsigned long base;
559 unsigned long len;
560
561 if (pnp_resource_enabled(res)) {
562 base = res->start;
563 len = resource_size(res);
564 } else {
565 base = 0;
566 len = 0;
567 }
568
569 p[4] = base & 0xff;
570 p[5] = (base >> 8) & 0xff;
571 p[6] = (base >> 16) & 0xff;
572 p[7] = (base >> 24) & 0xff;
573 p[8] = len & 0xff;
574 p[9] = (len >> 8) & 0xff;
575 p[10] = (len >> 16) & 0xff;
576 p[11] = (len >> 24) & 0xff;
577
578 pnp_dbg(&dev->dev, " encode fixed_mem32 %#lx-%#lx\n", base,
579 base + len - 1);
580}
581
582static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p,
583 struct resource *res)
584{
585 unsigned long map;
586
587 if (pnp_resource_enabled(res))
588 map = 1 << res->start;
589 else
590 map = 0;
591
592 p[1] = map & 0xff;
593 p[2] = (map >> 8) & 0xff;
594
595 pnp_dbg(&dev->dev, " encode irq mask %#lx\n", map);
596}
597
598static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p,
599 struct resource *res)
600{
601 unsigned long map;
602
603 if (pnp_resource_enabled(res))
604 map = 1 << res->start;
605 else
606 map = 0;
607
608 p[1] = map & 0xff;
609
610 pnp_dbg(&dev->dev, " encode dma mask %#lx\n", map);
611}
612
613static void pnpbios_encode_port(struct pnp_dev *dev, unsigned char *p,
614 struct resource *res)
615{
616 unsigned long base;
617 unsigned long len;
618
619 if (pnp_resource_enabled(res)) {
620 base = res->start;
621 len = resource_size(res);
622 } else {
623 base = 0;
624 len = 0;
625 }
626
627 p[2] = base & 0xff;
628 p[3] = (base >> 8) & 0xff;
629 p[4] = base & 0xff;
630 p[5] = (base >> 8) & 0xff;
631 p[7] = len & 0xff;
632
633 pnp_dbg(&dev->dev, " encode io %#lx-%#lx\n", base, base + len - 1);
634}
635
636static void pnpbios_encode_fixed_port(struct pnp_dev *dev, unsigned char *p,
637 struct resource *res)
638{
639 unsigned long base = res->start;
640 unsigned long len = resource_size(res);
641
642 if (pnp_resource_enabled(res)) {
643 base = res->start;
644 len = resource_size(res);
645 } else {
646 base = 0;
647 len = 0;
648 }
649
650 p[1] = base & 0xff;
651 p[2] = (base >> 8) & 0xff;
652 p[3] = len & 0xff;
653
654 pnp_dbg(&dev->dev, " encode fixed_io %#lx-%#lx\n", base,
655 base + len - 1);
656}
657
658static unsigned char *pnpbios_encode_allocated_resource_data(struct pnp_dev
659 *dev,
660 unsigned char *p,
661 unsigned char *end)
662{
663 unsigned int len, tag;
664 int port = 0, irq = 0, dma = 0, mem = 0;
665
666 if (!p)
667 return NULL;
668
669 while ((char *)p < (char *)end) {
670
671 /* determine the type of tag */
672 if (p[0] & LARGE_TAG) { /* large tag */
673 len = (p[2] << 8) | p[1];
674 tag = p[0];
675 } else { /* small tag */
676 len = p[0] & 0x07;
677 tag = ((p[0] >> 3) & 0x0f);
678 }
679
680 switch (tag) {
681
682 case LARGE_TAG_MEM:
683 if (len != 9)
684 goto len_err;
685 pnpbios_encode_mem(dev, p,
686 pnp_get_resource(dev, IORESOURCE_MEM, mem));
687 mem++;
688 break;
689
690 case LARGE_TAG_MEM32:
691 if (len != 17)
692 goto len_err;
693 pnpbios_encode_mem32(dev, p,
694 pnp_get_resource(dev, IORESOURCE_MEM, mem));
695 mem++;
696 break;
697
698 case LARGE_TAG_FIXEDMEM32:
699 if (len != 9)
700 goto len_err;
701 pnpbios_encode_fixed_mem32(dev, p,
702 pnp_get_resource(dev, IORESOURCE_MEM, mem));
703 mem++;
704 break;
705
706 case SMALL_TAG_IRQ:
707 if (len < 2 || len > 3)
708 goto len_err;
709 pnpbios_encode_irq(dev, p,
710 pnp_get_resource(dev, IORESOURCE_IRQ, irq));
711 irq++;
712 break;
713
714 case SMALL_TAG_DMA:
715 if (len != 2)
716 goto len_err;
717 pnpbios_encode_dma(dev, p,
718 pnp_get_resource(dev, IORESOURCE_DMA, dma));
719 dma++;
720 break;
721
722 case SMALL_TAG_PORT:
723 if (len != 7)
724 goto len_err;
725 pnpbios_encode_port(dev, p,
726 pnp_get_resource(dev, IORESOURCE_IO, port));
727 port++;
728 break;
729
730 case SMALL_TAG_VENDOR:
731 /* do nothing */
732 break;
733
734 case SMALL_TAG_FIXEDPORT:
735 if (len != 3)
736 goto len_err;
737 pnpbios_encode_fixed_port(dev, p,
738 pnp_get_resource(dev, IORESOURCE_IO, port));
739 port++;
740 break;
741
742 case SMALL_TAG_END:
743 p = p + 2;
744 return (unsigned char *)p;
745 break;
746
747 default: /* an unknown tag */
748len_err:
749 dev_err(&dev->dev, "unknown tag %#x length %d\n",
750 tag, len);
751 break;
752 }
753
754 /* continue to the next tag */
755 if (p[0] & LARGE_TAG)
756 p += len + 3;
757 else
758 p += len + 1;
759 }
760
761 dev_err(&dev->dev, "no end tag in resource structure\n");
762
763 return NULL;
764}
765
766/*
767 * Core Parsing Functions
768 */
769
770int __init pnpbios_parse_data_stream(struct pnp_dev *dev,
771 struct pnp_bios_node *node)
772{
773 unsigned char *p = (char *)node->data;
774 unsigned char *end = (char *)(node->data + node->size);
775
776 p = pnpbios_parse_allocated_resource_data(dev, p, end);
777 if (!p)
778 return -EIO;
779 p = pnpbios_parse_resource_option_data(p, end, dev);
780 if (!p)
781 return -EIO;
782 p = pnpbios_parse_compatible_ids(p, end, dev);
783 if (!p)
784 return -EIO;
785 return 0;
786}
787
788int pnpbios_read_resources_from_node(struct pnp_dev *dev,
789 struct pnp_bios_node *node)
790{
791 unsigned char *p = (char *)node->data;
792 unsigned char *end = (char *)(node->data + node->size);
793
794 p = pnpbios_parse_allocated_resource_data(dev, p, end);
795 if (!p)
796 return -EIO;
797 return 0;
798}
799
800int pnpbios_write_resources_to_node(struct pnp_dev *dev,
801 struct pnp_bios_node *node)
802{
803 unsigned char *p = (char *)node->data;
804 unsigned char *end = (char *)(node->data + node->size);
805
806 p = pnpbios_encode_allocated_resource_data(dev, p, end);
807 if (!p)
808 return -EIO;
809 return 0;
810}
811

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