Commit | Line | Data |
---|---|---|
12869ecd | 1 | // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) |
1cade994 DG |
2 | /* |
3 | * libfdt - Flat Device Tree manipulation | |
4 | * Copyright (C) 2006 David Gibson, IBM Corporation. | |
1cade994 DG |
5 | */ |
6 | #include "libfdt_env.h" | |
7 | ||
8 | #include <fdt.h> | |
9 | #include <libfdt.h> | |
10 | ||
11 | #include "libfdt_internal.h" | |
12 | ||
9130ba88 RH |
13 | static int fdt_blocks_misordered_(const void *fdt, |
14 | int mem_rsv_size, int struct_size) | |
1cade994 | 15 | { |
ed95d745 | 16 | return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8)) |
1cade994 DG |
17 | || (fdt_off_dt_struct(fdt) < |
18 | (fdt_off_mem_rsvmap(fdt) + mem_rsv_size)) | |
19 | || (fdt_off_dt_strings(fdt) < | |
20 | (fdt_off_dt_struct(fdt) + struct_size)) | |
21 | || (fdt_totalsize(fdt) < | |
22 | (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt))); | |
23 | } | |
24 | ||
f858927f | 25 | static int fdt_rw_probe_(void *fdt) |
1cade994 | 26 | { |
f858927f | 27 | FDT_RO_PROBE(fdt); |
1cade994 | 28 | |
1cade994 DG |
29 | if (fdt_version(fdt) < 17) |
30 | return -FDT_ERR_BADVERSION; | |
9130ba88 | 31 | if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry), |
ed95d745 | 32 | fdt_size_dt_struct(fdt))) |
1cade994 DG |
33 | return -FDT_ERR_BADLAYOUT; |
34 | if (fdt_version(fdt) > 17) | |
35 | fdt_set_version(fdt, 17); | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
f858927f | 40 | #define FDT_RW_PROBE(fdt) \ |
1cade994 | 41 | { \ |
9130ba88 | 42 | int err_; \ |
f858927f | 43 | if ((err_ = fdt_rw_probe_(fdt)) != 0) \ |
9130ba88 | 44 | return err_; \ |
1cade994 DG |
45 | } |
46 | ||
9130ba88 | 47 | static inline int fdt_data_size_(void *fdt) |
1cade994 DG |
48 | { |
49 | return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); | |
50 | } | |
51 | ||
9130ba88 | 52 | static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen) |
1cade994 | 53 | { |
ed95d745 | 54 | char *p = splicepoint; |
9130ba88 | 55 | char *end = (char *)fdt + fdt_data_size_(fdt); |
1cade994 DG |
56 | |
57 | if (((p + oldlen) < p) || ((p + oldlen) > end)) | |
58 | return -FDT_ERR_BADOFFSET; | |
91feabc2 RH |
59 | if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt)) |
60 | return -FDT_ERR_BADOFFSET; | |
ed95d745 | 61 | if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt))) |
1cade994 DG |
62 | return -FDT_ERR_NOSPACE; |
63 | memmove(p + newlen, p + oldlen, end - p - oldlen); | |
64 | return 0; | |
65 | } | |
66 | ||
9130ba88 | 67 | static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p, |
ed95d745 | 68 | int oldn, int newn) |
1cade994 DG |
69 | { |
70 | int delta = (newn - oldn) * sizeof(*p); | |
71 | int err; | |
9130ba88 | 72 | err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p)); |
1cade994 DG |
73 | if (err) |
74 | return err; | |
75 | fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta); | |
76 | fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta); | |
77 | return 0; | |
78 | } | |
79 | ||
9130ba88 | 80 | static int fdt_splice_struct_(void *fdt, void *p, |
ed95d745 | 81 | int oldlen, int newlen) |
1cade994 DG |
82 | { |
83 | int delta = newlen - oldlen; | |
84 | int err; | |
85 | ||
9130ba88 | 86 | if ((err = fdt_splice_(fdt, p, oldlen, newlen))) |
1cade994 DG |
87 | return err; |
88 | ||
89 | fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta); | |
90 | fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta); | |
91 | return 0; | |
92 | } | |
93 | ||
9bb9c6a1 RH |
94 | /* Must only be used to roll back in case of error */ |
95 | static void fdt_del_last_string_(void *fdt, const char *s) | |
96 | { | |
97 | int newlen = strlen(s) + 1; | |
98 | ||
99 | fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) - newlen); | |
100 | } | |
101 | ||
9130ba88 | 102 | static int fdt_splice_string_(void *fdt, int newlen) |
1cade994 | 103 | { |
ed95d745 DG |
104 | void *p = (char *)fdt |
105 | + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); | |
1cade994 DG |
106 | int err; |
107 | ||
9130ba88 | 108 | if ((err = fdt_splice_(fdt, p, 0, newlen))) |
1cade994 DG |
109 | return err; |
110 | ||
111 | fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen); | |
112 | return 0; | |
113 | } | |
114 | ||
9bb9c6a1 | 115 | static int fdt_find_add_string_(void *fdt, const char *s, int *allocated) |
1cade994 DG |
116 | { |
117 | char *strtab = (char *)fdt + fdt_off_dt_strings(fdt); | |
118 | const char *p; | |
119 | char *new; | |
120 | int len = strlen(s) + 1; | |
121 | int err; | |
122 | ||
9bb9c6a1 RH |
123 | *allocated = 0; |
124 | ||
9130ba88 | 125 | p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s); |
1cade994 DG |
126 | if (p) |
127 | /* found it */ | |
128 | return (p - strtab); | |
129 | ||
130 | new = strtab + fdt_size_dt_strings(fdt); | |
9130ba88 | 131 | err = fdt_splice_string_(fdt, len); |
1cade994 DG |
132 | if (err) |
133 | return err; | |
134 | ||
9bb9c6a1 RH |
135 | *allocated = 1; |
136 | ||
1cade994 DG |
137 | memcpy(new, s, len); |
138 | return (new - strtab); | |
139 | } | |
140 | ||
141 | int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size) | |
142 | { | |
143 | struct fdt_reserve_entry *re; | |
144 | int err; | |
145 | ||
f858927f | 146 | FDT_RW_PROBE(fdt); |
1cade994 | 147 | |
9130ba88 RH |
148 | re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt)); |
149 | err = fdt_splice_mem_rsv_(fdt, re, 0, 1); | |
1cade994 DG |
150 | if (err) |
151 | return err; | |
152 | ||
153 | re->address = cpu_to_fdt64(address); | |
154 | re->size = cpu_to_fdt64(size); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | int fdt_del_mem_rsv(void *fdt, int n) | |
159 | { | |
9130ba88 | 160 | struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n); |
1cade994 | 161 | |
f858927f | 162 | FDT_RW_PROBE(fdt); |
ed95d745 | 163 | |
1cade994 DG |
164 | if (n >= fdt_num_mem_rsv(fdt)) |
165 | return -FDT_ERR_NOTFOUND; | |
166 | ||
9130ba88 | 167 | return fdt_splice_mem_rsv_(fdt, re, 1, 0); |
1cade994 DG |
168 | } |
169 | ||
9130ba88 | 170 | static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name, |
ed95d745 | 171 | int len, struct fdt_property **prop) |
1cade994 DG |
172 | { |
173 | int oldlen; | |
174 | int err; | |
175 | ||
176 | *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); | |
4201d057 | 177 | if (!*prop) |
1cade994 DG |
178 | return oldlen; |
179 | ||
9130ba88 | 180 | if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen), |
ed95d745 | 181 | FDT_TAGALIGN(len)))) |
1cade994 DG |
182 | return err; |
183 | ||
184 | (*prop)->len = cpu_to_fdt32(len); | |
185 | return 0; | |
186 | } | |
187 | ||
9130ba88 | 188 | static int fdt_add_property_(void *fdt, int nodeoffset, const char *name, |
ed95d745 | 189 | int len, struct fdt_property **prop) |
1cade994 | 190 | { |
1cade994 DG |
191 | int proplen; |
192 | int nextoffset; | |
193 | int namestroff; | |
194 | int err; | |
9bb9c6a1 | 195 | int allocated; |
1cade994 | 196 | |
9130ba88 | 197 | if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0) |
ed95d745 | 198 | return nextoffset; |
1cade994 | 199 | |
9bb9c6a1 | 200 | namestroff = fdt_find_add_string_(fdt, name, &allocated); |
1cade994 DG |
201 | if (namestroff < 0) |
202 | return namestroff; | |
203 | ||
9130ba88 | 204 | *prop = fdt_offset_ptr_w_(fdt, nextoffset); |
ed95d745 | 205 | proplen = sizeof(**prop) + FDT_TAGALIGN(len); |
1cade994 | 206 | |
9130ba88 | 207 | err = fdt_splice_struct_(fdt, *prop, 0, proplen); |
9bb9c6a1 RH |
208 | if (err) { |
209 | if (allocated) | |
210 | fdt_del_last_string_(fdt, name); | |
1cade994 | 211 | return err; |
9bb9c6a1 | 212 | } |
1cade994 DG |
213 | |
214 | (*prop)->tag = cpu_to_fdt32(FDT_PROP); | |
215 | (*prop)->nameoff = cpu_to_fdt32(namestroff); | |
216 | (*prop)->len = cpu_to_fdt32(len); | |
217 | return 0; | |
218 | } | |
219 | ||
ed95d745 DG |
220 | int fdt_set_name(void *fdt, int nodeoffset, const char *name) |
221 | { | |
222 | char *namep; | |
223 | int oldlen, newlen; | |
224 | int err; | |
225 | ||
f858927f | 226 | FDT_RW_PROBE(fdt); |
ed95d745 DG |
227 | |
228 | namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen); | |
229 | if (!namep) | |
230 | return oldlen; | |
231 | ||
232 | newlen = strlen(name); | |
233 | ||
9130ba88 | 234 | err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1), |
ed95d745 DG |
235 | FDT_TAGALIGN(newlen+1)); |
236 | if (err) | |
237 | return err; | |
238 | ||
239 | memcpy(namep, name, newlen+1); | |
240 | return 0; | |
241 | } | |
242 | ||
4201d057 RH |
243 | int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name, |
244 | int len, void **prop_data) | |
1cade994 DG |
245 | { |
246 | struct fdt_property *prop; | |
247 | int err; | |
248 | ||
f858927f | 249 | FDT_RW_PROBE(fdt); |
1cade994 | 250 | |
9130ba88 | 251 | err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop); |
1cade994 | 252 | if (err == -FDT_ERR_NOTFOUND) |
9130ba88 | 253 | err = fdt_add_property_(fdt, nodeoffset, name, len, &prop); |
1cade994 DG |
254 | if (err) |
255 | return err; | |
256 | ||
4201d057 RH |
257 | *prop_data = prop->data; |
258 | return 0; | |
259 | } | |
260 | ||
261 | int fdt_setprop(void *fdt, int nodeoffset, const char *name, | |
262 | const void *val, int len) | |
263 | { | |
264 | void *prop_data; | |
265 | int err; | |
266 | ||
267 | err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data); | |
268 | if (err) | |
269 | return err; | |
270 | ||
89d12310 | 271 | if (len) |
4201d057 | 272 | memcpy(prop_data, val, len); |
1cade994 DG |
273 | return 0; |
274 | } | |
275 | ||
cd296721 SW |
276 | int fdt_appendprop(void *fdt, int nodeoffset, const char *name, |
277 | const void *val, int len) | |
278 | { | |
279 | struct fdt_property *prop; | |
280 | int err, oldlen, newlen; | |
281 | ||
f858927f | 282 | FDT_RW_PROBE(fdt); |
cd296721 SW |
283 | |
284 | prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); | |
285 | if (prop) { | |
286 | newlen = len + oldlen; | |
9130ba88 | 287 | err = fdt_splice_struct_(fdt, prop->data, |
cd296721 SW |
288 | FDT_TAGALIGN(oldlen), |
289 | FDT_TAGALIGN(newlen)); | |
290 | if (err) | |
291 | return err; | |
292 | prop->len = cpu_to_fdt32(newlen); | |
293 | memcpy(prop->data + oldlen, val, len); | |
294 | } else { | |
9130ba88 | 295 | err = fdt_add_property_(fdt, nodeoffset, name, len, &prop); |
cd296721 SW |
296 | if (err) |
297 | return err; | |
298 | memcpy(prop->data, val, len); | |
299 | } | |
300 | return 0; | |
301 | } | |
302 | ||
1cade994 DG |
303 | int fdt_delprop(void *fdt, int nodeoffset, const char *name) |
304 | { | |
305 | struct fdt_property *prop; | |
306 | int len, proplen; | |
307 | ||
f858927f | 308 | FDT_RW_PROBE(fdt); |
1cade994 DG |
309 | |
310 | prop = fdt_get_property_w(fdt, nodeoffset, name, &len); | |
4201d057 | 311 | if (!prop) |
1cade994 DG |
312 | return len; |
313 | ||
ed95d745 | 314 | proplen = sizeof(*prop) + FDT_TAGALIGN(len); |
9130ba88 | 315 | return fdt_splice_struct_(fdt, prop, proplen, 0); |
1cade994 DG |
316 | } |
317 | ||
318 | int fdt_add_subnode_namelen(void *fdt, int parentoffset, | |
319 | const char *name, int namelen) | |
320 | { | |
321 | struct fdt_node_header *nh; | |
322 | int offset, nextoffset; | |
323 | int nodelen; | |
324 | int err; | |
325 | uint32_t tag; | |
47605971 | 326 | fdt32_t *endtag; |
1cade994 | 327 | |
f858927f | 328 | FDT_RW_PROBE(fdt); |
1cade994 DG |
329 | |
330 | offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen); | |
331 | if (offset >= 0) | |
332 | return -FDT_ERR_EXISTS; | |
333 | else if (offset != -FDT_ERR_NOTFOUND) | |
334 | return offset; | |
335 | ||
336 | /* Try to place the new node after the parent's properties */ | |
337 | fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */ | |
338 | do { | |
339 | offset = nextoffset; | |
340 | tag = fdt_next_tag(fdt, offset, &nextoffset); | |
ed95d745 | 341 | } while ((tag == FDT_PROP) || (tag == FDT_NOP)); |
1cade994 | 342 | |
9130ba88 | 343 | nh = fdt_offset_ptr_w_(fdt, offset); |
ed95d745 | 344 | nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE; |
1cade994 | 345 | |
9130ba88 | 346 | err = fdt_splice_struct_(fdt, nh, 0, nodelen); |
1cade994 DG |
347 | if (err) |
348 | return err; | |
349 | ||
350 | nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE); | |
ed95d745 | 351 | memset(nh->name, 0, FDT_TAGALIGN(namelen+1)); |
1cade994 | 352 | memcpy(nh->name, name, namelen); |
47605971 | 353 | endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE); |
1cade994 DG |
354 | *endtag = cpu_to_fdt32(FDT_END_NODE); |
355 | ||
356 | return offset; | |
357 | } | |
358 | ||
359 | int fdt_add_subnode(void *fdt, int parentoffset, const char *name) | |
360 | { | |
361 | return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name)); | |
362 | } | |
363 | ||
364 | int fdt_del_node(void *fdt, int nodeoffset) | |
365 | { | |
366 | int endoffset; | |
367 | ||
f858927f | 368 | FDT_RW_PROBE(fdt); |
1cade994 | 369 | |
9130ba88 | 370 | endoffset = fdt_node_end_offset_(fdt, nodeoffset); |
1cade994 DG |
371 | if (endoffset < 0) |
372 | return endoffset; | |
373 | ||
9130ba88 | 374 | return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset), |
ed95d745 | 375 | endoffset - nodeoffset, 0); |
1cade994 DG |
376 | } |
377 | ||
9130ba88 | 378 | static void fdt_packblocks_(const char *old, char *new, |
ed95d745 | 379 | int mem_rsv_size, int struct_size) |
1cade994 DG |
380 | { |
381 | int mem_rsv_off, struct_off, strings_off; | |
382 | ||
ed95d745 | 383 | mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8); |
1cade994 DG |
384 | struct_off = mem_rsv_off + mem_rsv_size; |
385 | strings_off = struct_off + struct_size; | |
386 | ||
ed95d745 DG |
387 | memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size); |
388 | fdt_set_off_mem_rsvmap(new, mem_rsv_off); | |
1cade994 | 389 | |
ed95d745 DG |
390 | memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size); |
391 | fdt_set_off_dt_struct(new, struct_off); | |
392 | fdt_set_size_dt_struct(new, struct_size); | |
1cade994 | 393 | |
ed95d745 DG |
394 | memmove(new + strings_off, old + fdt_off_dt_strings(old), |
395 | fdt_size_dt_strings(old)); | |
396 | fdt_set_off_dt_strings(new, strings_off); | |
397 | fdt_set_size_dt_strings(new, fdt_size_dt_strings(old)); | |
1cade994 DG |
398 | } |
399 | ||
400 | int fdt_open_into(const void *fdt, void *buf, int bufsize) | |
401 | { | |
402 | int err; | |
403 | int mem_rsv_size, struct_size; | |
404 | int newsize; | |
ed95d745 DG |
405 | const char *fdtstart = fdt; |
406 | const char *fdtend = fdtstart + fdt_totalsize(fdt); | |
407 | char *tmp; | |
1cade994 | 408 | |
f858927f | 409 | FDT_RO_PROBE(fdt); |
1cade994 DG |
410 | |
411 | mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) | |
412 | * sizeof(struct fdt_reserve_entry); | |
413 | ||
414 | if (fdt_version(fdt) >= 17) { | |
415 | struct_size = fdt_size_dt_struct(fdt); | |
416 | } else { | |
417 | struct_size = 0; | |
418 | while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END) | |
419 | ; | |
cd296721 SW |
420 | if (struct_size < 0) |
421 | return struct_size; | |
1cade994 DG |
422 | } |
423 | ||
9130ba88 | 424 | if (!fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) { |
1cade994 DG |
425 | /* no further work necessary */ |
426 | err = fdt_move(fdt, buf, bufsize); | |
427 | if (err) | |
428 | return err; | |
429 | fdt_set_version(buf, 17); | |
430 | fdt_set_size_dt_struct(buf, struct_size); | |
431 | fdt_set_totalsize(buf, bufsize); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | /* Need to reorder */ | |
ed95d745 | 436 | newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size |
1cade994 DG |
437 | + struct_size + fdt_size_dt_strings(fdt); |
438 | ||
439 | if (bufsize < newsize) | |
440 | return -FDT_ERR_NOSPACE; | |
441 | ||
ed95d745 DG |
442 | /* First attempt to build converted tree at beginning of buffer */ |
443 | tmp = buf; | |
444 | /* But if that overlaps with the old tree... */ | |
445 | if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) { | |
446 | /* Try right after the old tree instead */ | |
447 | tmp = (char *)(uintptr_t)fdtend; | |
448 | if ((tmp + newsize) > ((char *)buf + bufsize)) | |
1cade994 DG |
449 | return -FDT_ERR_NOSPACE; |
450 | } | |
451 | ||
9130ba88 | 452 | fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size); |
1cade994 DG |
453 | memmove(buf, tmp, newsize); |
454 | ||
455 | fdt_set_magic(buf, FDT_MAGIC); | |
456 | fdt_set_totalsize(buf, bufsize); | |
457 | fdt_set_version(buf, 17); | |
458 | fdt_set_last_comp_version(buf, 16); | |
459 | fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt)); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | int fdt_pack(void *fdt) | |
465 | { | |
466 | int mem_rsv_size; | |
1cade994 | 467 | |
f858927f | 468 | FDT_RW_PROBE(fdt); |
1cade994 DG |
469 | |
470 | mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) | |
471 | * sizeof(struct fdt_reserve_entry); | |
9130ba88 RH |
472 | fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt)); |
473 | fdt_set_totalsize(fdt, fdt_data_size_(fdt)); | |
1cade994 DG |
474 | |
475 | return 0; | |
476 | } |