summaryrefslogtreecommitdiffstats
path: root/cpukit/dtc/libfdt/fdt_ro.c
blob: e5b313682007265ed67036b64c39890c14c830f8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 *
 * libfdt is dual licensed: you can use it either under the terms of
 * the GPL, or the BSD license, at your option.
 *
 *  a) This library is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of the
 *     License, or (at your option) any later version.
 *
 *     This library is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public
 *     License along with this library; if not, write to the Free
 *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 *     MA 02110-1301 USA
 *
 * Alternatively,
 *
 *  b) Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *     1. Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *     2. Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "libfdt_env.h"

#include <fdt.h>
#include <libfdt.h>

#include "libfdt_internal.h"

static int _fdt_nodename_eq(const void *fdt, int offset,
			    const char *s, int len)
{
	const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);

	if (! p)
		/* short match */
		return 0;

	if (memcmp(p, s, len) != 0)
		return 0;

	if (p[len] == '\0')
		return 1;
	else if (!memchr(s, '@', len) && (p[len] == '@'))
		return 1;
	else
		return 0;
}

const char *fdt_string(const void *fdt, int stroffset)
{
	return (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
}

static int _fdt_string_eq(const void *fdt, int stroffset,
			  const char *s, int len)
{
	const char *p = fdt_string(fdt, stroffset);

	return (strlen(p) == len) && (memcmp(p, s, len) == 0);
}

int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
{
	FDT_CHECK_HEADER(fdt);
	*address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
	*size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
	return 0;
}

int fdt_num_mem_rsv(const void *fdt)
{
	int i = 0;

	while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
		i++;
	return i;
}

static int _nextprop(const void *fdt, int offset)
{
	uint32_t tag;
	int nextoffset;

	do {
		tag = fdt_next_tag(fdt, offset, &nextoffset);

		switch (tag) {
		case FDT_END:
			if (nextoffset >= 0)
				return -FDT_ERR_BADSTRUCTURE;
			else
				return nextoffset;

		case FDT_PROP:
			return offset;
		}
		offset = nextoffset;
	} while (tag == FDT_NOP);

	return -FDT_ERR_NOTFOUND;
}

int fdt_subnode_offset_namelen(const void *fdt, int offset,
			       const char *name, int namelen)
{
	int depth;

	FDT_CHECK_HEADER(fdt);

	for (depth = 0;
	     (offset >= 0) && (depth >= 0);
	     offset = fdt_next_node(fdt, offset, &depth))
		if ((depth == 1)
		    && _fdt_nodename_eq(fdt, offset, name, namelen))
			return offset;

	if (depth < 0)
		return -FDT_ERR_NOTFOUND;
	return offset; /* error */
}

int fdt_subnode_offset(const void *fdt, int parentoffset,
		       const char *name)
{
	return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
}

int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen)
{
	const char *end = path + namelen;
	const char *p = path;
	int offset = 0;

	FDT_CHECK_HEADER(fdt);

	/* see if we have an alias */
	if (*path != '/') {
		const char *q = memchr(path, '/', end - p);

		if (!q)
			q = end;

		p = fdt_get_alias_namelen(fdt, p, q - p);
		if (!p)
			return -FDT_ERR_BADPATH;
		offset = fdt_path_offset(fdt, p);

		p = q;
	}

	while (p < end) {
		const char *q;

		while (*p == '/') {
			p++;
			if (p == end)
				return offset;
		}
		q = memchr(p, '/', end - p);
		if (! q)
			q = end;

		offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
		if (offset < 0)
			return offset;

		p = q;
	}

	return offset;
}

int fdt_path_offset(const void *fdt, const char *path)
{
	return fdt_path_offset_namelen(fdt, path, strlen(path));
}

const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
{
	const struct fdt_node_header *nh = _fdt_offset_ptr(fdt, nodeoffset);
	int err;

	if (((err = fdt_check_header(fdt)) != 0)
	    || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
			goto fail;

	if (len)
		*len = strlen(nh->name);

	return nh->name;

 fail:
	if (len)
		*len = err;
	return NULL;
}

int fdt_first_property_offset(const void *fdt, int nodeoffset)
{
	int offset;

	if ((offset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
		return offset;

	return _nextprop(fdt, offset);
}

int fdt_next_property_offset(const void *fdt, int offset)
{
	if ((offset = _fdt_check_prop_offset(fdt, offset)) < 0)
		return offset;

	return _nextprop(fdt, offset);
}

const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
						      int offset,
						      int *lenp)
{
	int err;
	const struct fdt_property *prop;

	if ((err = _fdt_check_prop_offset(fdt, offset)) < 0) {
		if (lenp)
			*lenp = err;
		return NULL;
	}

	prop = _fdt_offset_ptr(fdt, offset);

	if (lenp)
		*lenp = fdt32_to_cpu(prop->len);

	return prop;
}

const struct fdt_property *fdt_get_property_namelen(const void *fdt,
						    int offset,
						    const char *name,
						    int namelen, int *lenp)
{
	for (offset = fdt_first_property_offset(fdt, offset);
	     (offset >= 0);
	     (offset = fdt_next_property_offset(fdt, offset))) {
		const struct fdt_property *prop;

		if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
			offset = -FDT_ERR_INTERNAL;
			break;
		}
		if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
				   name, namelen))
			return prop;
	}

	if (lenp)
		*lenp = offset;
	return NULL;
}

const struct fdt_property *fdt_get_property(const void *fdt,
					    int nodeoffset,
					    const char *name, int *lenp)
{
	return fdt_get_property_namelen(fdt, nodeoffset, name,
					strlen(name), lenp);
}

const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
				const char *name, int namelen, int *lenp)
{
	const struct fdt_property *prop;

	prop = fdt_get_property_namelen(fdt, nodeoffset, name, namelen, lenp);
	if (! prop)
		return NULL;

	return prop->data;
}

const void *fdt_getprop_by_offset(const void *fdt, int offset,
				  const char **namep, int *lenp)
{
	const struct fdt_property *prop;

	prop = fdt_get_property_by_offset(fdt, offset, lenp);
	if (!prop)
		return NULL;
	if (namep)
		*namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
	return prop->data;
}

const void *fdt_getprop(const void *fdt, int nodeoffset,
			const char *name, int *lenp)
{
	return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
}

uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
{
	const fdt32_t *php;
	int len;

	/* FIXME: This is a bit sub-optimal, since we potentially scan
	 * over all the properties twice. */
	php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
	if (!php || (len != sizeof(*php))) {
		php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
		if (!php || (len != sizeof(*php)))
			return 0;
	}

	return fdt32_to_cpu(*php);
}

const char *fdt_get_alias_namelen(const void *fdt,
				  const char *name, int namelen)
{
	int aliasoffset;

	aliasoffset = fdt_path_offset(fdt, "/aliases");
	if (aliasoffset < 0)
		return NULL;

	return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
}

const char *fdt_get_alias(const void *fdt, const char *name)
{
	return fdt_get_alias_namelen(fdt, name, strlen(name));
}

int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
{
	int pdepth = 0, p = 0;
	int offset, depth, namelen;
	const char *name;

	FDT_CHECK_HEADER(fdt);

	if (buflen < 2)
		return -FDT_ERR_NOSPACE;

	for (offset = 0, depth = 0;
	     (offset >= 0) && (offset <= nodeoffset);
	     offset = fdt_next_node(fdt, offset, &depth)) {
		while (pdepth > depth) {
			do {
				p--;
			} while (buf[p-1] != '/');
			pdepth--;
		}

		if (pdepth >= depth) {
			name = fdt_get_name(fdt, offset, &namelen);
			if (!name)
				return namelen;
			if ((p + namelen + 1) <= buflen) {
				memcpy(buf + p, name, namelen);
				p += namelen;
				buf[p++] = '/';
				pdepth++;
			}
		}

		if (offset == nodeoffset) {
			if (pdepth < (depth + 1))
				return -FDT_ERR_NOSPACE;

			if (p > 1) /* special case so that root path is "/", not "" */
				p--;
			buf[p] = '\0';
			return 0;
		}
	}

	if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
		return -FDT_ERR_BADOFFSET;
	else if (offset == -FDT_ERR_BADOFFSET)
		return -FDT_ERR_BADSTRUCTURE;

	return offset; /* error from fdt_next_node() */
}

int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
				 int supernodedepth, int *nodedepth)
{
	int offset, depth;
	int supernodeoffset = -FDT_ERR_INTERNAL;

	FDT_CHECK_HEADER(fdt);

	if (supernodedepth < 0)
		return -FDT_ERR_NOTFOUND;

	for (offset = 0, depth = 0;
	     (offset >= 0) && (offset <= nodeoffset);
	     offset = fdt_next_node(fdt, offset, &depth)) {
		if (depth == supernodedepth)
			supernodeoffset = offset;

		if (offset == nodeoffset) {
			if (nodedepth)
				*nodedepth = depth;

			if (supernodedepth > depth)
				return -FDT_ERR_NOTFOUND;
			else
				return supernodeoffset;
		}
	}

	if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
		return -FDT_ERR_BADOFFSET;
	else if (offset == -FDT_ERR_BADOFFSET)
		return -FDT_ERR_BADSTRUCTURE;

	return offset; /* error from fdt_next_node() */
}

int fdt_node_depth(const void *fdt, int nodeoffset)
{
	int nodedepth;
	int err;

	err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
	if (err)
		return (err < 0) ? err : -FDT_ERR_INTERNAL;
	return nodedepth;
}

int fdt_parent_offset(const void *fdt, int nodeoffset)
{
	int nodedepth = fdt_node_depth(fdt, nodeoffset);

	if (nodedepth < 0)
		return nodedepth;
	return fdt_supernode_atdepth_offset(fdt, nodeoffset,
					    nodedepth - 1, NULL);
}

int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
				  const char *propname,
				  const void *propval, int proplen)
{
	int offset;
	const void *val;
	int len;

	FDT_CHECK_HEADER(fdt);

	/* FIXME: The algorithm here is pretty horrible: we scan each
	 * property of a node in fdt_getprop(), then if that didn't
	 * find what we want, we scan over them again making our way
	 * to the next node.  Still it's the easiest to implement
	 * approach; performance can come later. */
	for (offset = fdt_next_node(fdt, startoffset, NULL);
	     offset >= 0;
	     offset = fdt_next_node(fdt, offset, NULL)) {
		val = fdt_getprop(fdt, offset, propname, &len);
		if (val && (len == proplen)
		    && (memcmp(val, propval, len) == 0))
			return offset;
	}

	return offset; /* error from fdt_next_node() */
}

int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
{
	int offset;

	if ((phandle == 0) || (phandle == -1))
		return -FDT_ERR_BADPHANDLE;

	FDT_CHECK_HEADER(fdt);

	/* FIXME: The algorithm here is pretty horrible: we
	 * potentially scan each property of a node in
	 * fdt_get_phandle(), then if that didn't find what
	 * we want, we scan over them again making our way to the next
	 * node.  Still it's the easiest to implement approach;
	 * performance can come later. */
	for (offset = fdt_next_node(fdt, -1, NULL);
	     offset >= 0;
	     offset = fdt_next_node(fdt, offset, NULL)) {
		if (fdt_get_phandle(fdt, offset) == phandle)
			return offset;
	}

	return offset; /* error from fdt_next_node() */
}

int fdt_stringlist_contains(const char *strlist, int listlen, const char *str)
{
	int len = strlen(str);
	const char *p;

	while (listlen >= len) {
		if (memcmp(str, strlist, len+1) == 0)
			return 1;
		p = memchr(strlist, '\0', listlen);
		if (!p)
			return 0; /* malformed strlist.. */
		listlen -= (p-strlist) + 1;
		strlist = p + 1;
	}
	return 0;
}

int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property)
{
	const char *list, *end;
	int length, count = 0;

	list = fdt_getprop(fdt, nodeoffset, property, &length);
	if (!list)
		return -length;

	end = list + length;

	while (list < end) {
		length = strnlen(list, end - list) + 1;

		/* Abort if the last string isn't properly NUL-terminated. */
		if (list + length > end)
			return -FDT_ERR_BADVALUE;

		list += length;
		count++;
	}

	return count;
}

int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
			  const char *string)
{
	int length, len, idx = 0;
	const char *list, *end;

	list = fdt_getprop(fdt, nodeoffset, property, &length);
	if (!list)
		return -length;

	len = strlen(string) + 1;
	end = list + length;

	while (list < end) {
		length = strnlen(list, end - list) + 1;

		/* Abort if the last string isn't properly NUL-terminated. */
		if (list + length > end)
			return -FDT_ERR_BADVALUE;

		if (length == len && memcmp(list, string, length) == 0)
			return idx;

		list += length;
		idx++;
	}

	return -FDT_ERR_NOTFOUND;
}

const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
			       const char *property, int idx,
			       int *lenp)
{
	const char *list, *end;
	int length;

	list = fdt_getprop(fdt, nodeoffset, property, &length);
	if (!list) {
		if (lenp)
			*lenp = length;

		return NULL;
	}

	end = list + length;

	while (list < end) {
		length = strnlen(list, end - list) + 1;

		/* Abort if the last string isn't properly NUL-terminated. */
		if (list + length > end) {
			if (lenp)
				*lenp = -FDT_ERR_BADVALUE;

			return NULL;
		}

		if (idx == 0) {
			if (lenp)
				*lenp = length - 1;

			return list;
		}

		list += length;
		idx--;
	}

	if (lenp)
		*lenp = -FDT_ERR_NOTFOUND;

	return NULL;
}

int fdt_node_check_compatible(const void *fdt, int nodeoffset,
			      const char *compatible)
{
	const void *prop;
	int len;

	prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
	if (!prop)
		return len;
	if (fdt_stringlist_contains(prop, len, compatible))
		return 0;
	else
		return 1;
}

int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
				  const char *compatible)
{
	int offset, err;

	FDT_CHECK_HEADER(fdt);

	/* FIXME: The algorithm here is pretty horrible: we scan each
	 * property of a node in fdt_node_check_compatible(), then if
	 * that didn't find what we want, we scan over them again
	 * making our way to the next node.  Still it's the easiest to
	 * implement approach; performance can come later. */
	for (offset = fdt_next_node(fdt, startoffset, NULL);
	     offset >= 0;
	     offset = fdt_next_node(fdt, offset, NULL)) {
		err = fdt_node_check_compatible(fdt, offset, compatible);
		if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
			return err;
		else if (err == 0)
			return offset;
	}

	return offset; /* error from fdt_next_node() */
}