summaryrefslogtreecommitdiff
path: root/scripts/dtc/libfdt/fdt_rw.c
blob: 3621d3651d3f4bd82b7af66c60d023e3139add03 (plain)
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
// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 */
#include "libfdt_env.h"

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

#include "libfdt_internal.h"

static int fdt_blocks_misordered_(const void *fdt,
				  int mem_rsv_size, int struct_size)
{
	return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
		|| (fdt_off_dt_struct(fdt) <
		    (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
		|| (fdt_off_dt_strings(fdt) <
		    (fdt_off_dt_struct(fdt) + struct_size))
		|| (fdt_totalsize(fdt) <
		    (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
}

static int fdt_rw_probe_(void *fdt)
{
	if (can_assume(VALID_DTB))
		return 0;
	FDT_RO_PROBE(fdt);

	if (!can_assume(LATEST) && fdt_version(fdt) < 17)
		return -FDT_ERR_BADVERSION;
	if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry),
				   fdt_size_dt_struct(fdt)))
		return -FDT_ERR_BADLAYOUT;
	if (!can_assume(LATEST) && fdt_version(fdt) > 17)
		fdt_set_version(fdt, 17);

	return 0;
}

#define FDT_RW_PROBE(fdt) \
	{ \
		int err_; \
		if ((err_ = fdt_rw_probe_(fdt)) != 0) \
			return err_; \
	}

static inline unsigned int fdt_data_size_(void *fdt)
{
	return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
}

static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen)
{
	char *p = splicepoint;
	unsigned int dsize = fdt_data_size_(fdt);
	size_t soff = p - (char *)fdt;

	if ((oldlen < 0) || (soff + oldlen < soff) || (soff + oldlen > dsize))
		return -FDT_ERR_BADOFFSET;
	if ((p < (char *)fdt) || (dsize + newlen < (unsigned)oldlen))
		return -FDT_ERR_BADOFFSET;
	if (dsize - oldlen + newlen > fdt_totalsize(fdt))
		return -FDT_ERR_NOSPACE;
	memmove(p + newlen, p + oldlen, ((char *)fdt + dsize) - (p + oldlen));
	return 0;
}

static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p,
			       int oldn, int newn)
{
	int delta = (newn - oldn) * sizeof(*p);
	int err;
	err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
	if (err)
		return err;
	fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
	fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
	return 0;
}

static int fdt_splice_struct_(void *fdt, void *p,
			      int oldlen, int newlen)
{
	int delta = newlen - oldlen;
	int err;

	if ((err = fdt_splice_(fdt, p, oldlen, newlen)))
		return err;

	fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
	fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
	return 0;
}

/* Must only be used to roll back in case of error */
static void fdt_del_last_string_(void *fdt, const char *s)
{
	int newlen = strlen(s) + 1;

	fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) - newlen);
}

static int fdt_splice_string_(void *fdt, int newlen)
{
	void *p = (char *)fdt
		+ fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
	int err;

	if ((err = fdt_splice_(fdt, p, 0, newlen)))
		return err;

	fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
	return 0;
}

/**
 * fdt_find_add_string_() - Find or allocate a string
 *
 * @fdt: pointer to the device tree to check/adjust
 * @s: string to find/add
 * @allocated: Set to 0 if the string was found, 1 if not found and so
 *	allocated. Ignored if can_assume(NO_ROLLBACK)
 * @return offset of string in the string table (whether found or added)
 */
static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
{
	char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
	const char *p;
	char *new;
	int len = strlen(s) + 1;
	int err;

	if (!can_assume(NO_ROLLBACK))
		*allocated = 0;

	p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
	if (p)
		/* found it */
		return (p - strtab);

	new = strtab + fdt_size_dt_strings(fdt);
	err = fdt_splice_string_(fdt, len);
	if (err)
		return err;

	if (!can_assume(NO_ROLLBACK))
		*allocated = 1;

	memcpy(new, s, len);
	return (new - strtab);
}

int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
{
	struct fdt_reserve_entry *re;
	int err;

	FDT_RW_PROBE(fdt);

	re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt));
	err = fdt_splice_mem_rsv_(fdt, re, 0, 1);
	if (err)
		return err;

	re->address = cpu_to_fdt64(address);
	re->size = cpu_to_fdt64(size);
	return 0;
}

int fdt_del_mem_rsv(void *fdt, int n)
{
	struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n);

	FDT_RW_PROBE(fdt);

	if (n >= fdt_num_mem_rsv(fdt))
		return -FDT_ERR_NOTFOUND;

	return fdt_splice_mem_rsv_(fdt, re, 1, 0);
}

static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name,
				int len, struct fdt_property **prop)
{
	int oldlen;
	int err;

	*prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
	if (!*prop)
		return oldlen;

	if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
				      FDT_TAGALIGN(len))))
		return err;

	(*prop)->len = cpu_to_fdt32(len);
	return 0;
}

static int fdt_add_property_(void *fdt, int nodeoffset, const char *name,
			     int len, struct fdt_property **prop)
{
	int proplen;
	int nextoffset;
	int namestroff;
	int err;
	int allocated;

	if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
		return nextoffset;

	namestroff = fdt_find_add_string_(fdt, name, &allocated);
	if (namestroff < 0)
		return namestroff;

	*prop = fdt_offset_ptr_w_(fdt, nextoffset);
	proplen = sizeof(**prop) + FDT_TAGALIGN(len);

	err = fdt_splice_struct_(fdt, *prop, 0, proplen);
	if (err) {
		/* Delete the string if we failed to add it */
		if (!can_assume(NO_ROLLBACK) && allocated)
			fdt_del_last_string_(fdt, name);
		return err;
	}

	(*prop)->tag = cpu_to_fdt32(FDT_PROP);
	(*prop)->nameoff = cpu_to_fdt32(namestroff);
	(*prop)->len = cpu_to_fdt32(len);
	return 0;
}

int fdt_set_name(void *fdt, int nodeoffset, const char *name)
{
	char *namep;
	int oldlen, newlen;
	int err;

	FDT_RW_PROBE(fdt);

	namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
	if (!namep)
		return oldlen;

	newlen = strlen(name);

	err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1),
				 FDT_TAGALIGN(newlen+1));
	if (err)
		return err;

	memcpy(namep, name, newlen+1);
	return 0;
}

int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
			    int len, void **prop_data)
{
	struct fdt_property *prop;
	int err;

	FDT_RW_PROBE(fdt);

	err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop);
	if (err == -FDT_ERR_NOTFOUND)
		err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
	if (err)
		return err;

	*prop_data = prop->data;
	return 0;
}

int fdt_setprop(void *fdt, int nodeoffset, const char *name,
		const void *val, int len)
{
	void *prop_data;
	int err;

	err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
	if (err)
		return err;

	if (len)
		memcpy(prop_data, val, len);
	return 0;
}

int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
		   const void *val, int len)
{
	struct fdt_property *prop;
	int err, oldlen, newlen;

	FDT_RW_PROBE(fdt);

	prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
	if (prop) {
		newlen = len + oldlen;
		err = fdt_splice_struct_(fdt, prop->data,
					 FDT_TAGALIGN(oldlen),
					 FDT_TAGALIGN(newlen));
		if (err)
			return err;
		prop->len = cpu_to_fdt32(newlen);
		memcpy(prop->data + oldlen, val, len);
	} else {
		err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
		if (err)
			return err;
		memcpy(prop->data, val, len);
	}
	return 0;
}

int fdt_delprop(void *fdt, int nodeoffset, const char *name)
{
	struct fdt_property *prop;
	int len, proplen;

	FDT_RW_PROBE(fdt);

	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
	if (!prop)
		return len;

	proplen = sizeof(*prop) + FDT_TAGALIGN(len);
	return fdt_splice_struct_(fdt, prop, proplen, 0);
}

int fdt_add_subnode_namelen(void *fdt, int parentoffset,
			    const char *name, int namelen)
{
	struct fdt_node_header *nh;
	int offset, nextoffset;
	int nodelen;
	int err;
	uint32_t tag;
	fdt32_t *endtag;

	FDT_RW_PROBE(fdt);

	offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
	if (offset >= 0)
		return -FDT_ERR_EXISTS;
	else if (offset != -FDT_ERR_NOTFOUND)
		return offset;

	/* Try to place the new node after the parent's properties */
	tag = fdt_next_tag(fdt, parentoffset, &nextoffset);
	/* the fdt_subnode_offset_namelen() should ensure this never hits */
	if (!can_assume(LIBFDT_FLAWLESS) && (tag != FDT_BEGIN_NODE))
		return -FDT_ERR_INTERNAL;
	do {
		offset = nextoffset;
		tag = fdt_next_tag(fdt, offset, &nextoffset);
	} while ((tag == FDT_PROP) || (tag == FDT_NOP));

	nh = fdt_offset_ptr_w_(fdt, offset);
	nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;

	err = fdt_splice_struct_(fdt, nh, 0, nodelen);
	if (err)
		return err;

	nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
	memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
	memcpy(nh->name, name, namelen);
	endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
	*endtag = cpu_to_fdt32(FDT_END_NODE);

	return offset;
}

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

int fdt_del_node(void *fdt, int nodeoffset)
{
	int endoffset;

	FDT_RW_PROBE(fdt);

	endoffset = fdt_node_end_offset_(fdt, nodeoffset);
	if (endoffset < 0)
		return endoffset;

	return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset),
				  endoffset - nodeoffset, 0);
}

static void fdt_packblocks_(const char *old, char *new,
			    int mem_rsv_size,
			    int struct_size,
			    int strings_size)
{
	int mem_rsv_off, struct_off, strings_off;

	mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
	struct_off = mem_rsv_off + mem_rsv_size;
	strings_off = struct_off + struct_size;

	memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
	fdt_set_off_mem_rsvmap(new, mem_rsv_off);

	memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
	fdt_set_off_dt_struct(new, struct_off);
	fdt_set_size_dt_struct(new, struct_size);

	memmove(new + strings_off, old + fdt_off_dt_strings(old), strings_size);
	fdt_set_off_dt_strings(new, strings_off);
	fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
}

int fdt_open_into(const void *fdt, void *buf, int bufsize)
{
	int err;
	int mem_rsv_size, struct_size;
	int newsize;
	const char *fdtstart = fdt;
	const char *fdtend = fdtstart + fdt_totalsize(fdt);
	char *tmp;

	FDT_RO_PROBE(fdt);

	mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
		* sizeof(struct fdt_reserve_entry);

	if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
		struct_size = fdt_size_dt_struct(fdt);
	} else if (fdt_version(fdt) == 16) {
		struct_size = 0;
		while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
			;
		if (struct_size < 0)
			return struct_size;
	} else {
		return -FDT_ERR_BADVERSION;
	}

	if (can_assume(LIBFDT_ORDER) ||
	    !fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) {
		/* no further work necessary */
		err = fdt_move(fdt, buf, bufsize);
		if (err)
			return err;
		fdt_set_version(buf, 17);
		fdt_set_size_dt_struct(buf, struct_size);
		fdt_set_totalsize(buf, bufsize);
		return 0;
	}

	/* Need to reorder */
	newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
		+ struct_size + fdt_size_dt_strings(fdt);

	if (bufsize < newsize)
		return -FDT_ERR_NOSPACE;

	/* First attempt to build converted tree at beginning of buffer */
	tmp = buf;
	/* But if that overlaps with the old tree... */
	if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
		/* Try right after the old tree instead */
		tmp = (char *)(uintptr_t)fdtend;
		if ((tmp + newsize) > ((char *)buf + bufsize))
			return -FDT_ERR_NOSPACE;
	}

	fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size,
			fdt_size_dt_strings(fdt));
	memmove(buf, tmp, newsize);

	fdt_set_magic(buf, FDT_MAGIC);
	fdt_set_totalsize(buf, bufsize);
	fdt_set_version(buf, 17);
	fdt_set_last_comp_version(buf, 16);
	fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));

	return 0;
}

int fdt_pack(void *fdt)
{
	int mem_rsv_size;

	FDT_RW_PROBE(fdt);

	mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
		* sizeof(struct fdt_reserve_entry);
	fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt),
			fdt_size_dt_strings(fdt));
	fdt_set_totalsize(fdt, fdt_data_size_(fdt));

	return 0;
}