xref: /freebsd/sys/contrib/libfdt/fdt_rw.c (revision 95ee2897e98f5d444f26ed2334cc7c439f9c16c6)
1 /*
2  * libfdt - Flat Device Tree manipulation
3  * Copyright (C) 2006 David Gibson, IBM Corporation.
4  *
5  * libfdt is dual licensed: you can use it either under the terms of
6  * the GPL, or the BSD license, at your option.
7  *
8  *  a) This library is free software; you can redistribute it and/or
9  *     modify it under the terms of the GNU General Public License as
10  *     published by the Free Software Foundation; either version 2 of the
11  *     License, or (at your option) any later version.
12  *
13  *     This library is distributed in the hope that it will be useful,
14  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *     GNU General Public License for more details.
17  *
18  *     You should have received a copy of the GNU General Public
19  *     License along with this library; if not, write to the Free
20  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
21  *     MA 02110-1301 USA
22  *
23  * Alternatively,
24  *
25  *  b) Redistribution and use in source and binary forms, with or
26  *     without modification, are permitted provided that the following
27  *     conditions are met:
28  *
29  *     1. Redistributions of source code must retain the above
30  *        copyright notice, this list of conditions and the following
31  *        disclaimer.
32  *     2. Redistributions in binary form must reproduce the above
33  *        copyright notice, this list of conditions and the following
34  *        disclaimer in the documentation and/or other materials
35  *        provided with the distribution.
36  *
37  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
38  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
39  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
42  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
49  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50  */
51 #include "libfdt_env.h"
52 
53 #include <fdt.h>
54 #include <libfdt.h>
55 
56 #include "libfdt_internal.h"
57 
58 static int fdt_blocks_misordered_(const void *fdt,
59 				  int mem_rsv_size, int struct_size)
60 {
61 	return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
62 		|| (fdt_off_dt_struct(fdt) <
63 		    (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
64 		|| (fdt_off_dt_strings(fdt) <
65 		    (fdt_off_dt_struct(fdt) + struct_size))
66 		|| (fdt_totalsize(fdt) <
67 		    (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
68 }
69 
70 static int fdt_rw_check_header_(void *fdt)
71 {
72 	FDT_CHECK_HEADER(fdt);
73 
74 	if (fdt_version(fdt) < 17)
75 		return -FDT_ERR_BADVERSION;
76 	if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry),
77 				   fdt_size_dt_struct(fdt)))
78 		return -FDT_ERR_BADLAYOUT;
79 	if (fdt_version(fdt) > 17)
80 		fdt_set_version(fdt, 17);
81 
82 	return 0;
83 }
84 
85 #define FDT_RW_CHECK_HEADER(fdt) \
86 	{ \
87 		int err_; \
88 		if ((err_ = fdt_rw_check_header_(fdt)) != 0) \
89 			return err_; \
90 	}
91 
92 static inline int fdt_data_size_(void *fdt)
93 {
94 	return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
95 }
96 
97 static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen)
98 {
99 	char *p = splicepoint;
100 	char *end = (char *)fdt + fdt_data_size_(fdt);
101 
102 	if (((p + oldlen) < p) || ((p + oldlen) > end))
103 		return -FDT_ERR_BADOFFSET;
104 	if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt))
105 		return -FDT_ERR_BADOFFSET;
106 	if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
107 		return -FDT_ERR_NOSPACE;
108 	memmove(p + newlen, p + oldlen, end - p - oldlen);
109 	return 0;
110 }
111 
112 static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p,
113 			       int oldn, int newn)
114 {
115 	int delta = (newn - oldn) * sizeof(*p);
116 	int err;
117 	err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
118 	if (err)
119 		return err;
120 	fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
121 	fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
122 	return 0;
123 }
124 
125 static int fdt_splice_struct_(void *fdt, void *p,
126 			      int oldlen, int newlen)
127 {
128 	int delta = newlen - oldlen;
129 	int err;
130 
131 	if ((err = fdt_splice_(fdt, p, oldlen, newlen)))
132 		return err;
133 
134 	fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
135 	fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
136 	return 0;
137 }
138 
139 static int fdt_splice_string_(void *fdt, int newlen)
140 {
141 	void *p = (char *)fdt
142 		+ fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
143 	int err;
144 
145 	if ((err = fdt_splice_(fdt, p, 0, newlen)))
146 		return err;
147 
148 	fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
149 	return 0;
150 }
151 
152 static int fdt_find_add_string_(void *fdt, const char *s)
153 {
154 	char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
155 	const char *p;
156 	char *new;
157 	int len = strlen(s) + 1;
158 	int err;
159 
160 	p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
161 	if (p)
162 		/* found it */
163 		return (p - strtab);
164 
165 	new = strtab + fdt_size_dt_strings(fdt);
166 	err = fdt_splice_string_(fdt, len);
167 	if (err)
168 		return err;
169 
170 	memcpy(new, s, len);
171 	return (new - strtab);
172 }
173 
174 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
175 {
176 	struct fdt_reserve_entry *re;
177 	int err;
178 
179 	FDT_RW_CHECK_HEADER(fdt);
180 
181 	re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt));
182 	err = fdt_splice_mem_rsv_(fdt, re, 0, 1);
183 	if (err)
184 		return err;
185 
186 	re->address = cpu_to_fdt64(address);
187 	re->size = cpu_to_fdt64(size);
188 	return 0;
189 }
190 
191 int fdt_del_mem_rsv(void *fdt, int n)
192 {
193 	struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n);
194 
195 	FDT_RW_CHECK_HEADER(fdt);
196 
197 	if (n >= fdt_num_mem_rsv(fdt))
198 		return -FDT_ERR_NOTFOUND;
199 
200 	return fdt_splice_mem_rsv_(fdt, re, 1, 0);
201 }
202 
203 static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name,
204 				int len, struct fdt_property **prop)
205 {
206 	int oldlen;
207 	int err;
208 
209 	*prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
210 	if (!*prop)
211 		return oldlen;
212 
213 	if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
214 				      FDT_TAGALIGN(len))))
215 		return err;
216 
217 	(*prop)->len = cpu_to_fdt32(len);
218 	return 0;
219 }
220 
221 static int fdt_add_property_(void *fdt, int nodeoffset, const char *name,
222 			     int len, struct fdt_property **prop)
223 {
224 	int proplen;
225 	int nextoffset;
226 	int namestroff;
227 	int err;
228 
229 	if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
230 		return nextoffset;
231 
232 	namestroff = fdt_find_add_string_(fdt, name);
233 	if (namestroff < 0)
234 		return namestroff;
235 
236 	*prop = fdt_offset_ptr_w_(fdt, nextoffset);
237 	proplen = sizeof(**prop) + FDT_TAGALIGN(len);
238 
239 	err = fdt_splice_struct_(fdt, *prop, 0, proplen);
240 	if (err)
241 		return err;
242 
243 	(*prop)->tag = cpu_to_fdt32(FDT_PROP);
244 	(*prop)->nameoff = cpu_to_fdt32(namestroff);
245 	(*prop)->len = cpu_to_fdt32(len);
246 	return 0;
247 }
248 
249 int fdt_set_name(void *fdt, int nodeoffset, const char *name)
250 {
251 	char *namep;
252 	int oldlen, newlen;
253 	int err;
254 
255 	FDT_RW_CHECK_HEADER(fdt);
256 
257 	namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
258 	if (!namep)
259 		return oldlen;
260 
261 	newlen = strlen(name);
262 
263 	err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1),
264 				 FDT_TAGALIGN(newlen+1));
265 	if (err)
266 		return err;
267 
268 	memcpy(namep, name, newlen+1);
269 	return 0;
270 }
271 
272 int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
273 			    int len, void **prop_data)
274 {
275 	struct fdt_property *prop;
276 	int err;
277 
278 	FDT_RW_CHECK_HEADER(fdt);
279 
280 	err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop);
281 	if (err == -FDT_ERR_NOTFOUND)
282 		err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
283 	if (err)
284 		return err;
285 
286 	*prop_data = prop->data;
287 	return 0;
288 }
289 
290 int fdt_setprop(void *fdt, int nodeoffset, const char *name,
291 		const void *val, int len)
292 {
293 	void *prop_data;
294 	int err;
295 
296 	err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
297 	if (err)
298 		return err;
299 
300 	if (len)
301 		memcpy(prop_data, val, len);
302 	return 0;
303 }
304 
305 int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
306 		   const void *val, int len)
307 {
308 	struct fdt_property *prop;
309 	int err, oldlen, newlen;
310 
311 	FDT_RW_CHECK_HEADER(fdt);
312 
313 	prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
314 	if (prop) {
315 		newlen = len + oldlen;
316 		err = fdt_splice_struct_(fdt, prop->data,
317 					 FDT_TAGALIGN(oldlen),
318 					 FDT_TAGALIGN(newlen));
319 		if (err)
320 			return err;
321 		prop->len = cpu_to_fdt32(newlen);
322 		memcpy(prop->data + oldlen, val, len);
323 	} else {
324 		err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
325 		if (err)
326 			return err;
327 		memcpy(prop->data, val, len);
328 	}
329 	return 0;
330 }
331 
332 int fdt_delprop(void *fdt, int nodeoffset, const char *name)
333 {
334 	struct fdt_property *prop;
335 	int len, proplen;
336 
337 	FDT_RW_CHECK_HEADER(fdt);
338 
339 	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
340 	if (!prop)
341 		return len;
342 
343 	proplen = sizeof(*prop) + FDT_TAGALIGN(len);
344 	return fdt_splice_struct_(fdt, prop, proplen, 0);
345 }
346 
347 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
348 			    const char *name, int namelen)
349 {
350 	struct fdt_node_header *nh;
351 	int offset, nextoffset;
352 	int nodelen;
353 	int err;
354 	uint32_t tag;
355 	fdt32_t *endtag;
356 
357 	FDT_RW_CHECK_HEADER(fdt);
358 
359 	offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
360 	if (offset >= 0)
361 		return -FDT_ERR_EXISTS;
362 	else if (offset != -FDT_ERR_NOTFOUND)
363 		return offset;
364 
365 	/* Try to place the new node after the parent's properties */
366 	fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
367 	do {
368 		offset = nextoffset;
369 		tag = fdt_next_tag(fdt, offset, &nextoffset);
370 	} while ((tag == FDT_PROP) || (tag == FDT_NOP));
371 
372 	nh = fdt_offset_ptr_w_(fdt, offset);
373 	nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
374 
375 	err = fdt_splice_struct_(fdt, nh, 0, nodelen);
376 	if (err)
377 		return err;
378 
379 	nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
380 	memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
381 	memcpy(nh->name, name, namelen);
382 	endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
383 	*endtag = cpu_to_fdt32(FDT_END_NODE);
384 
385 	return offset;
386 }
387 
388 int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
389 {
390 	return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
391 }
392 
393 int fdt_del_node(void *fdt, int nodeoffset)
394 {
395 	int endoffset;
396 
397 	FDT_RW_CHECK_HEADER(fdt);
398 
399 	endoffset = fdt_node_end_offset_(fdt, nodeoffset);
400 	if (endoffset < 0)
401 		return endoffset;
402 
403 	return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset),
404 				  endoffset - nodeoffset, 0);
405 }
406 
407 static void fdt_packblocks_(const char *old, char *new,
408 			    int mem_rsv_size, int struct_size)
409 {
410 	int mem_rsv_off, struct_off, strings_off;
411 
412 	mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
413 	struct_off = mem_rsv_off + mem_rsv_size;
414 	strings_off = struct_off + struct_size;
415 
416 	memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
417 	fdt_set_off_mem_rsvmap(new, mem_rsv_off);
418 
419 	memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
420 	fdt_set_off_dt_struct(new, struct_off);
421 	fdt_set_size_dt_struct(new, struct_size);
422 
423 	memmove(new + strings_off, old + fdt_off_dt_strings(old),
424 		fdt_size_dt_strings(old));
425 	fdt_set_off_dt_strings(new, strings_off);
426 	fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
427 }
428 
429 int fdt_open_into(const void *fdt, void *buf, int bufsize)
430 {
431 	int err;
432 	int mem_rsv_size, struct_size;
433 	int newsize;
434 	const char *fdtstart = fdt;
435 	const char *fdtend = fdtstart + fdt_totalsize(fdt);
436 	char *tmp;
437 
438 	FDT_CHECK_HEADER(fdt);
439 
440 	mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
441 		* sizeof(struct fdt_reserve_entry);
442 
443 	if (fdt_version(fdt) >= 17) {
444 		struct_size = fdt_size_dt_struct(fdt);
445 	} else {
446 		struct_size = 0;
447 		while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
448 			;
449 		if (struct_size < 0)
450 			return struct_size;
451 	}
452 
453 	if (!fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) {
454 		/* no further work necessary */
455 		err = fdt_move(fdt, buf, bufsize);
456 		if (err)
457 			return err;
458 		fdt_set_version(buf, 17);
459 		fdt_set_size_dt_struct(buf, struct_size);
460 		fdt_set_totalsize(buf, bufsize);
461 		return 0;
462 	}
463 
464 	/* Need to reorder */
465 	newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
466 		+ struct_size + fdt_size_dt_strings(fdt);
467 
468 	if (bufsize < newsize)
469 		return -FDT_ERR_NOSPACE;
470 
471 	/* First attempt to build converted tree at beginning of buffer */
472 	tmp = buf;
473 	/* But if that overlaps with the old tree... */
474 	if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
475 		/* Try right after the old tree instead */
476 		tmp = (char *)(uintptr_t)fdtend;
477 		if ((tmp + newsize) > ((char *)buf + bufsize))
478 			return -FDT_ERR_NOSPACE;
479 	}
480 
481 	fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size);
482 	memmove(buf, tmp, newsize);
483 
484 	fdt_set_magic(buf, FDT_MAGIC);
485 	fdt_set_totalsize(buf, bufsize);
486 	fdt_set_version(buf, 17);
487 	fdt_set_last_comp_version(buf, 16);
488 	fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
489 
490 	return 0;
491 }
492 
493 int fdt_pack(void *fdt)
494 {
495 	int mem_rsv_size;
496 
497 	FDT_RW_CHECK_HEADER(fdt);
498 
499 	mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
500 		* sizeof(struct fdt_reserve_entry);
501 	fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
502 	fdt_set_totalsize(fdt, fdt_data_size_(fdt));
503 
504 	return 0;
505 }
506