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Commit | Line | Data |
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35748177 GVB |
1 | /* |
2 | * libfdt - Flat Device Tree manipulation | |
3 | * Copyright (C) 2006 David Gibson, IBM Corporation. | |
35084760 | 4 | * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause |
35748177 GVB |
5 | */ |
6 | #include "libfdt_env.h" | |
7 | ||
8cf30809 | 8 | #ifndef USE_HOSTCC |
35748177 GVB |
9 | #include <fdt.h> |
10 | #include <libfdt.h> | |
8cf30809 BS |
11 | #else |
12 | #include "fdt_host.h" | |
13 | #endif | |
35748177 GVB |
14 | |
15 | #include "libfdt_internal.h" | |
16 | ||
fc7758ee | 17 | static int _fdt_blocks_misordered(const void *fdt, |
8d04f02f KG |
18 | int mem_rsv_size, int struct_size) |
19 | { | |
fc7758ee | 20 | return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8)) |
8d04f02f KG |
21 | || (fdt_off_dt_struct(fdt) < |
22 | (fdt_off_mem_rsvmap(fdt) + mem_rsv_size)) | |
23 | || (fdt_off_dt_strings(fdt) < | |
24 | (fdt_off_dt_struct(fdt) + struct_size)) | |
25 | || (fdt_totalsize(fdt) < | |
26 | (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt))); | |
27 | } | |
28 | ||
fc7758ee | 29 | static int _fdt_rw_check_header(void *fdt) |
35748177 | 30 | { |
fc7758ee | 31 | FDT_CHECK_HEADER(fdt); |
35748177 | 32 | |
8d04f02f | 33 | if (fdt_version(fdt) < 17) |
35748177 | 34 | return -FDT_ERR_BADVERSION; |
fc7758ee DG |
35 | if (_fdt_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry), |
36 | fdt_size_dt_struct(fdt))) | |
35748177 | 37 | return -FDT_ERR_BADLAYOUT; |
8d04f02f KG |
38 | if (fdt_version(fdt) > 17) |
39 | fdt_set_version(fdt, 17); | |
40 | ||
35748177 GVB |
41 | return 0; |
42 | } | |
43 | ||
fc7758ee | 44 | #define FDT_RW_CHECK_HEADER(fdt) \ |
35748177 | 45 | { \ |
0596d35d SG |
46 | int __err; \ |
47 | if ((__err = _fdt_rw_check_header(fdt)) != 0) \ | |
48 | return __err; \ | |
35748177 GVB |
49 | } |
50 | ||
fc7758ee | 51 | static inline int _fdt_data_size(void *fdt) |
35748177 GVB |
52 | { |
53 | return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); | |
54 | } | |
55 | ||
fc7758ee | 56 | static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen) |
35748177 | 57 | { |
ef4e8ce1 | 58 | char *p = splicepoint; |
fc7758ee | 59 | char *end = (char *)fdt + _fdt_data_size(fdt); |
35748177 GVB |
60 | |
61 | if (((p + oldlen) < p) || ((p + oldlen) > end)) | |
62 | return -FDT_ERR_BADOFFSET; | |
ef4e8ce1 | 63 | if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt))) |
35748177 GVB |
64 | return -FDT_ERR_NOSPACE; |
65 | memmove(p + newlen, p + oldlen, end - p - oldlen); | |
66 | return 0; | |
67 | } | |
68 | ||
fc7758ee DG |
69 | static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p, |
70 | int oldn, int newn) | |
8d04f02f KG |
71 | { |
72 | int delta = (newn - oldn) * sizeof(*p); | |
73 | int err; | |
fc7758ee | 74 | err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p)); |
8d04f02f KG |
75 | if (err) |
76 | return err; | |
77 | fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta); | |
78 | fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta); | |
79 | return 0; | |
80 | } | |
81 | ||
fc7758ee DG |
82 | static int _fdt_splice_struct(void *fdt, void *p, |
83 | int oldlen, int newlen) | |
35748177 GVB |
84 | { |
85 | int delta = newlen - oldlen; | |
86 | int err; | |
87 | ||
fc7758ee | 88 | if ((err = _fdt_splice(fdt, p, oldlen, newlen))) |
35748177 GVB |
89 | return err; |
90 | ||
8d04f02f KG |
91 | fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta); |
92 | fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta); | |
35748177 GVB |
93 | return 0; |
94 | } | |
95 | ||
fc7758ee | 96 | static int _fdt_splice_string(void *fdt, int newlen) |
35748177 | 97 | { |
ef4e8ce1 DG |
98 | void *p = (char *)fdt |
99 | + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); | |
35748177 GVB |
100 | int err; |
101 | ||
fc7758ee | 102 | if ((err = _fdt_splice(fdt, p, 0, newlen))) |
35748177 GVB |
103 | return err; |
104 | ||
8d04f02f | 105 | fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen); |
35748177 GVB |
106 | return 0; |
107 | } | |
108 | ||
fc7758ee | 109 | static int _fdt_find_add_string(void *fdt, const char *s) |
35748177 GVB |
110 | { |
111 | char *strtab = (char *)fdt + fdt_off_dt_strings(fdt); | |
112 | const char *p; | |
113 | char *new; | |
114 | int len = strlen(s) + 1; | |
115 | int err; | |
116 | ||
117 | p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s); | |
118 | if (p) | |
119 | /* found it */ | |
120 | return (p - strtab); | |
121 | ||
122 | new = strtab + fdt_size_dt_strings(fdt); | |
fc7758ee | 123 | err = _fdt_splice_string(fdt, len); |
35748177 GVB |
124 | if (err) |
125 | return err; | |
126 | ||
127 | memcpy(new, s, len); | |
128 | return (new - strtab); | |
129 | } | |
130 | ||
8d04f02f KG |
131 | int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size) |
132 | { | |
133 | struct fdt_reserve_entry *re; | |
134 | int err; | |
135 | ||
fc7758ee | 136 | FDT_RW_CHECK_HEADER(fdt); |
8d04f02f KG |
137 | |
138 | re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt)); | |
fc7758ee | 139 | err = _fdt_splice_mem_rsv(fdt, re, 0, 1); |
8d04f02f KG |
140 | if (err) |
141 | return err; | |
142 | ||
143 | re->address = cpu_to_fdt64(address); | |
144 | re->size = cpu_to_fdt64(size); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | int fdt_del_mem_rsv(void *fdt, int n) | |
149 | { | |
150 | struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n); | |
151 | int err; | |
152 | ||
fc7758ee | 153 | FDT_RW_CHECK_HEADER(fdt); |
2f08bfa9 | 154 | |
8d04f02f KG |
155 | if (n >= fdt_num_mem_rsv(fdt)) |
156 | return -FDT_ERR_NOTFOUND; | |
157 | ||
fc7758ee | 158 | err = _fdt_splice_mem_rsv(fdt, re, 1, 0); |
8d04f02f KG |
159 | if (err) |
160 | return err; | |
161 | return 0; | |
162 | } | |
163 | ||
fc7758ee DG |
164 | static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name, |
165 | int len, struct fdt_property **prop) | |
35748177 GVB |
166 | { |
167 | int oldlen; | |
168 | int err; | |
169 | ||
8d04f02f | 170 | *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); |
35748177 GVB |
171 | if (! (*prop)) |
172 | return oldlen; | |
173 | ||
fc7758ee DG |
174 | if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen), |
175 | FDT_TAGALIGN(len)))) | |
35748177 GVB |
176 | return err; |
177 | ||
178 | (*prop)->len = cpu_to_fdt32(len); | |
179 | return 0; | |
180 | } | |
181 | ||
fc7758ee DG |
182 | static int _fdt_add_property(void *fdt, int nodeoffset, const char *name, |
183 | int len, struct fdt_property **prop) | |
35748177 | 184 | { |
35748177 GVB |
185 | int proplen; |
186 | int nextoffset; | |
187 | int namestroff; | |
188 | int err; | |
189 | ||
2f08bfa9 DG |
190 | if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0) |
191 | return nextoffset; | |
35748177 | 192 | |
fc7758ee | 193 | namestroff = _fdt_find_add_string(fdt, name); |
35748177 GVB |
194 | if (namestroff < 0) |
195 | return namestroff; | |
196 | ||
8d04f02f | 197 | *prop = _fdt_offset_ptr_w(fdt, nextoffset); |
fc7758ee | 198 | proplen = sizeof(**prop) + FDT_TAGALIGN(len); |
35748177 | 199 | |
fc7758ee | 200 | err = _fdt_splice_struct(fdt, *prop, 0, proplen); |
35748177 GVB |
201 | if (err) |
202 | return err; | |
203 | ||
204 | (*prop)->tag = cpu_to_fdt32(FDT_PROP); | |
205 | (*prop)->nameoff = cpu_to_fdt32(namestroff); | |
206 | (*prop)->len = cpu_to_fdt32(len); | |
207 | return 0; | |
208 | } | |
209 | ||
9eaeb07a DG |
210 | int fdt_set_name(void *fdt, int nodeoffset, const char *name) |
211 | { | |
212 | char *namep; | |
213 | int oldlen, newlen; | |
214 | int err; | |
215 | ||
fc7758ee | 216 | FDT_RW_CHECK_HEADER(fdt); |
9eaeb07a | 217 | |
c6683026 | 218 | namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen); |
9eaeb07a DG |
219 | if (!namep) |
220 | return oldlen; | |
221 | ||
222 | newlen = strlen(name); | |
223 | ||
fc7758ee DG |
224 | err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1), |
225 | FDT_TAGALIGN(newlen+1)); | |
9eaeb07a DG |
226 | if (err) |
227 | return err; | |
228 | ||
229 | memcpy(namep, name, newlen+1); | |
230 | return 0; | |
231 | } | |
232 | ||
35748177 GVB |
233 | int fdt_setprop(void *fdt, int nodeoffset, const char *name, |
234 | const void *val, int len) | |
235 | { | |
236 | struct fdt_property *prop; | |
237 | int err; | |
238 | ||
fc7758ee | 239 | FDT_RW_CHECK_HEADER(fdt); |
35748177 | 240 | |
fc7758ee | 241 | err = _fdt_resize_property(fdt, nodeoffset, name, len, &prop); |
35748177 | 242 | if (err == -FDT_ERR_NOTFOUND) |
fc7758ee | 243 | err = _fdt_add_property(fdt, nodeoffset, name, len, &prop); |
35748177 GVB |
244 | if (err) |
245 | return err; | |
246 | ||
247 | memcpy(prop->data, val, len); | |
248 | return 0; | |
249 | } | |
250 | ||
36ad18a6 ML |
251 | int fdt_appendprop(void *fdt, int nodeoffset, const char *name, |
252 | const void *val, int len) | |
253 | { | |
254 | struct fdt_property *prop; | |
255 | int err, oldlen, newlen; | |
256 | ||
257 | FDT_RW_CHECK_HEADER(fdt); | |
258 | ||
259 | prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); | |
260 | if (prop) { | |
261 | newlen = len + oldlen; | |
262 | err = _fdt_splice_struct(fdt, prop->data, | |
263 | FDT_TAGALIGN(oldlen), | |
264 | FDT_TAGALIGN(newlen)); | |
265 | if (err) | |
266 | return err; | |
267 | prop->len = cpu_to_fdt32(newlen); | |
268 | memcpy(prop->data + oldlen, val, len); | |
269 | } else { | |
270 | err = _fdt_add_property(fdt, nodeoffset, name, len, &prop); | |
271 | if (err) | |
272 | return err; | |
273 | memcpy(prop->data, val, len); | |
274 | } | |
275 | return 0; | |
276 | } | |
277 | ||
35748177 GVB |
278 | int fdt_delprop(void *fdt, int nodeoffset, const char *name) |
279 | { | |
280 | struct fdt_property *prop; | |
281 | int len, proplen; | |
282 | ||
fc7758ee | 283 | FDT_RW_CHECK_HEADER(fdt); |
35748177 | 284 | |
8d04f02f | 285 | prop = fdt_get_property_w(fdt, nodeoffset, name, &len); |
35748177 GVB |
286 | if (! prop) |
287 | return len; | |
288 | ||
fc7758ee DG |
289 | proplen = sizeof(*prop) + FDT_TAGALIGN(len); |
290 | return _fdt_splice_struct(fdt, prop, proplen, 0); | |
35748177 GVB |
291 | } |
292 | ||
293 | int fdt_add_subnode_namelen(void *fdt, int parentoffset, | |
294 | const char *name, int namelen) | |
295 | { | |
296 | struct fdt_node_header *nh; | |
297 | int offset, nextoffset; | |
298 | int nodelen; | |
299 | int err; | |
300 | uint32_t tag; | |
b2ba62a1 | 301 | fdt32_t *endtag; |
35748177 | 302 | |
fc7758ee | 303 | FDT_RW_CHECK_HEADER(fdt); |
35748177 GVB |
304 | |
305 | offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen); | |
306 | if (offset >= 0) | |
307 | return -FDT_ERR_EXISTS; | |
308 | else if (offset != -FDT_ERR_NOTFOUND) | |
309 | return offset; | |
310 | ||
311 | /* Try to place the new node after the parent's properties */ | |
8d04f02f | 312 | fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */ |
35748177 GVB |
313 | do { |
314 | offset = nextoffset; | |
8d04f02f | 315 | tag = fdt_next_tag(fdt, offset, &nextoffset); |
f84d65f9 | 316 | } while ((tag == FDT_PROP) || (tag == FDT_NOP)); |
35748177 | 317 | |
8d04f02f | 318 | nh = _fdt_offset_ptr_w(fdt, offset); |
fc7758ee | 319 | nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE; |
35748177 | 320 | |
fc7758ee | 321 | err = _fdt_splice_struct(fdt, nh, 0, nodelen); |
35748177 GVB |
322 | if (err) |
323 | return err; | |
324 | ||
325 | nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE); | |
fc7758ee | 326 | memset(nh->name, 0, FDT_TAGALIGN(namelen+1)); |
35748177 | 327 | memcpy(nh->name, name, namelen); |
b2ba62a1 | 328 | endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE); |
35748177 GVB |
329 | *endtag = cpu_to_fdt32(FDT_END_NODE); |
330 | ||
331 | return offset; | |
332 | } | |
333 | ||
334 | int fdt_add_subnode(void *fdt, int parentoffset, const char *name) | |
335 | { | |
336 | return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name)); | |
337 | } | |
338 | ||
339 | int fdt_del_node(void *fdt, int nodeoffset) | |
340 | { | |
341 | int endoffset; | |
342 | ||
fc7758ee | 343 | FDT_RW_CHECK_HEADER(fdt); |
8d04f02f | 344 | |
35748177 GVB |
345 | endoffset = _fdt_node_end_offset(fdt, nodeoffset); |
346 | if (endoffset < 0) | |
347 | return endoffset; | |
348 | ||
fc7758ee DG |
349 | return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset), |
350 | endoffset - nodeoffset, 0); | |
35748177 GVB |
351 | } |
352 | ||
fc7758ee DG |
353 | static void _fdt_packblocks(const char *old, char *new, |
354 | int mem_rsv_size, int struct_size) | |
8d04f02f KG |
355 | { |
356 | int mem_rsv_off, struct_off, strings_off; | |
357 | ||
fc7758ee | 358 | mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8); |
8d04f02f KG |
359 | struct_off = mem_rsv_off + mem_rsv_size; |
360 | strings_off = struct_off + struct_size; | |
361 | ||
ef4e8ce1 DG |
362 | memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size); |
363 | fdt_set_off_mem_rsvmap(new, mem_rsv_off); | |
8d04f02f | 364 | |
ef4e8ce1 DG |
365 | memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size); |
366 | fdt_set_off_dt_struct(new, struct_off); | |
367 | fdt_set_size_dt_struct(new, struct_size); | |
8d04f02f | 368 | |
ef4e8ce1 DG |
369 | memmove(new + strings_off, old + fdt_off_dt_strings(old), |
370 | fdt_size_dt_strings(old)); | |
371 | fdt_set_off_dt_strings(new, strings_off); | |
372 | fdt_set_size_dt_strings(new, fdt_size_dt_strings(old)); | |
8d04f02f KG |
373 | } |
374 | ||
375 | int fdt_open_into(const void *fdt, void *buf, int bufsize) | |
35748177 GVB |
376 | { |
377 | int err; | |
8d04f02f KG |
378 | int mem_rsv_size, struct_size; |
379 | int newsize; | |
ef4e8ce1 DG |
380 | const char *fdtstart = fdt; |
381 | const char *fdtend = fdtstart + fdt_totalsize(fdt); | |
382 | char *tmp; | |
35748177 | 383 | |
fc7758ee | 384 | FDT_CHECK_HEADER(fdt); |
35748177 | 385 | |
8d04f02f KG |
386 | mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) |
387 | * sizeof(struct fdt_reserve_entry); | |
35748177 | 388 | |
8d04f02f KG |
389 | if (fdt_version(fdt) >= 17) { |
390 | struct_size = fdt_size_dt_struct(fdt); | |
391 | } else { | |
392 | struct_size = 0; | |
393 | while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END) | |
394 | ; | |
a22d9cfb DG |
395 | if (struct_size < 0) |
396 | return struct_size; | |
8d04f02f | 397 | } |
35748177 | 398 | |
fc7758ee | 399 | if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) { |
8d04f02f KG |
400 | /* no further work necessary */ |
401 | err = fdt_move(fdt, buf, bufsize); | |
402 | if (err) | |
403 | return err; | |
404 | fdt_set_version(buf, 17); | |
405 | fdt_set_size_dt_struct(buf, struct_size); | |
406 | fdt_set_totalsize(buf, bufsize); | |
407 | return 0; | |
408 | } | |
35748177 | 409 | |
8d04f02f | 410 | /* Need to reorder */ |
fc7758ee | 411 | newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size |
8d04f02f KG |
412 | + struct_size + fdt_size_dt_strings(fdt); |
413 | ||
414 | if (bufsize < newsize) | |
415 | return -FDT_ERR_NOSPACE; | |
416 | ||
ef4e8ce1 DG |
417 | /* First attempt to build converted tree at beginning of buffer */ |
418 | tmp = buf; | |
419 | /* But if that overlaps with the old tree... */ | |
420 | if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) { | |
421 | /* Try right after the old tree instead */ | |
c6683026 | 422 | tmp = (char *)(uintptr_t)fdtend; |
ef4e8ce1 | 423 | if ((tmp + newsize) > ((char *)buf + bufsize)) |
8d04f02f KG |
424 | return -FDT_ERR_NOSPACE; |
425 | } | |
426 | ||
fc7758ee | 427 | _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size); |
8d04f02f KG |
428 | memmove(buf, tmp, newsize); |
429 | ||
430 | fdt_set_magic(buf, FDT_MAGIC); | |
431 | fdt_set_totalsize(buf, bufsize); | |
432 | fdt_set_version(buf, 17); | |
433 | fdt_set_last_comp_version(buf, 16); | |
434 | fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt)); | |
35748177 GVB |
435 | |
436 | return 0; | |
437 | } | |
438 | ||
439 | int fdt_pack(void *fdt) | |
440 | { | |
8d04f02f | 441 | int mem_rsv_size; |
35748177 | 442 | |
fc7758ee | 443 | FDT_RW_CHECK_HEADER(fdt); |
35748177 | 444 | |
8d04f02f KG |
445 | mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) |
446 | * sizeof(struct fdt_reserve_entry); | |
fc7758ee DG |
447 | _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt)); |
448 | fdt_set_totalsize(fdt, _fdt_data_size(fdt)); | |
8d04f02f | 449 | |
35748177 GVB |
450 | return 0; |
451 | } | |
8f6e2e1e SG |
452 | |
453 | int fdt_remove_unused_strings(const void *old, void *new) | |
454 | { | |
455 | const struct fdt_property *old_prop; | |
456 | struct fdt_property *new_prop; | |
457 | int size = fdt_totalsize(old); | |
458 | int next_offset, offset; | |
459 | const char *str; | |
460 | int ret; | |
461 | int tag = FDT_PROP; | |
462 | ||
463 | /* Make a copy and remove the strings */ | |
464 | memcpy(new, old, size); | |
465 | fdt_set_size_dt_strings(new, 0); | |
466 | ||
467 | /* Add every property name back into the new string table */ | |
468 | for (offset = 0; tag != FDT_END; offset = next_offset) { | |
469 | tag = fdt_next_tag(old, offset, &next_offset); | |
470 | if (tag != FDT_PROP) | |
471 | continue; | |
472 | old_prop = fdt_get_property_by_offset(old, offset, NULL); | |
473 | new_prop = (struct fdt_property *)(unsigned long) | |
474 | fdt_get_property_by_offset(new, offset, NULL); | |
475 | str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff)); | |
476 | ret = _fdt_find_add_string(new, str); | |
477 | if (ret < 0) | |
478 | return ret; | |
479 | new_prop->nameoff = cpu_to_fdt32(ret); | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } |