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1// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
2/*
3 * libfdt - Flat Device Tree manipulation
4 * Copyright (C) 2006 David Gibson, IBM Corporation.
5 */
6#include "libfdt_env.h"
7
8#include <fdt.h>
9#include <libfdt.h>
10
11#include "libfdt_internal.h"
12
13static int fdt_blocks_misordered_(const void *fdt,
14 int mem_rsv_size, int struct_size)
15{
16 return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
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
25static int fdt_rw_probe_(void *fdt)
26{
27 if (can_assume(VALID_DTB))
28 return 0;
29 FDT_RO_PROBE(fdt);
30
31 if (!can_assume(LATEST) && fdt_version(fdt) < 17)
32 return -FDT_ERR_BADVERSION;
33 if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry),
34 fdt_size_dt_struct(fdt)))
35 return -FDT_ERR_BADLAYOUT;
36 if (!can_assume(LATEST) && fdt_version(fdt) > 17)
37 fdt_set_version(fdt, 17);
38
39 return 0;
40}
41
42#define FDT_RW_PROBE(fdt) \
43 { \
44 int err_; \
45 if ((err_ = fdt_rw_probe_(fdt)) != 0) \
46 return err_; \
47 }
48
49static inline unsigned int fdt_data_size_(void *fdt)
50{
51 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
52}
53
54static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen)
55{
56 char *p = splicepoint;
57 unsigned int dsize = fdt_data_size_(fdt);
58 size_t soff = p - (char *)fdt;
59
60 if ((oldlen < 0) || (soff + oldlen < soff) || (soff + oldlen > dsize))
61 return -FDT_ERR_BADOFFSET;
62 if ((p < (char *)fdt) || (dsize + newlen < (unsigned)oldlen))
63 return -FDT_ERR_BADOFFSET;
64 if (dsize - oldlen + newlen > fdt_totalsize(fdt))
65 return -FDT_ERR_NOSPACE;
66 memmove(p + newlen, p + oldlen, ((char *)fdt + dsize) - (p + oldlen));
67 return 0;
68}
69
70static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p,
71 int oldn, int newn)
72{
73 int delta = (newn - oldn) * sizeof(*p);
74 int err;
75 err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
76 if (err)
77 return err;
78 fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
79 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
80 return 0;
81}
82
83static int fdt_splice_struct_(void *fdt, void *p,
84 int oldlen, int newlen)
85{
86 int delta = newlen - oldlen;
87 int err;
88
89 if ((err = fdt_splice_(fdt, p, oldlen, newlen)))
90 return err;
91
92 fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
93 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
94 return 0;
95}
96
97/* Must only be used to roll back in case of error */
98static void fdt_del_last_string_(void *fdt, const char *s)
99{
100 int newlen = strlen(s) + 1;
101
102 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) - newlen);
103}
104
105static int fdt_splice_string_(void *fdt, int newlen)
106{
107 void *p = (char *)fdt
108 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
109 int err;
110
111 if ((err = fdt_splice_(fdt, p, 0, newlen)))
112 return err;
113
114 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
115 return 0;
116}
117
118/**
119 * fdt_find_add_string_() - Find or allocate a string
120 *
121 * @fdt: pointer to the device tree to check/adjust
122 * @s: string to find/add
123 * @allocated: Set to 0 if the string was found, 1 if not found and so
124 * allocated. Ignored if can_assume(NO_ROLLBACK)
125 * @return offset of string in the string table (whether found or added)
126 */
127static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
128{
129 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
130 const char *p;
131 char *new;
132 int len = strlen(s) + 1;
133 int err;
134
135 if (!can_assume(NO_ROLLBACK))
136 *allocated = 0;
137
138 p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
139 if (p)
140 /* found it */
141 return (p - strtab);
142
143 new = strtab + fdt_size_dt_strings(fdt);
144 err = fdt_splice_string_(fdt, len);
145 if (err)
146 return err;
147
148 if (!can_assume(NO_ROLLBACK))
149 *allocated = 1;
150
151 memcpy(new, s, len);
152 return (new - strtab);
153}
154
155int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
156{
157 struct fdt_reserve_entry *re;
158 int err;
159
160 FDT_RW_PROBE(fdt);
161
162 re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt));
163 err = fdt_splice_mem_rsv_(fdt, re, 0, 1);
164 if (err)
165 return err;
166
167 re->address = cpu_to_fdt64(address);
168 re->size = cpu_to_fdt64(size);
169 return 0;
170}
171
172int fdt_del_mem_rsv(void *fdt, int n)
173{
174 struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n);
175
176 FDT_RW_PROBE(fdt);
177
178 if (n >= fdt_num_mem_rsv(fdt))
179 return -FDT_ERR_NOTFOUND;
180
181 return fdt_splice_mem_rsv_(fdt, re, 1, 0);
182}
183
184static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name,
185 int len, struct fdt_property **prop)
186{
187 int oldlen;
188 int err;
189
190 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
191 if (!*prop)
192 return oldlen;
193
194 if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
195 FDT_TAGALIGN(len))))
196 return err;
197
198 (*prop)->len = cpu_to_fdt32(len);
199 return 0;
200}
201
202static int fdt_add_property_(void *fdt, int nodeoffset, const char *name,
203 int len, struct fdt_property **prop)
204{
205 int proplen;
206 int nextoffset;
207 int namestroff;
208 int err;
209 int allocated;
210
211 if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
212 return nextoffset;
213
214 namestroff = fdt_find_add_string_(fdt, name, &allocated);
215 if (namestroff < 0)
216 return namestroff;
217
218 *prop = fdt_offset_ptr_w_(fdt, nextoffset);
219 proplen = sizeof(**prop) + FDT_TAGALIGN(len);
220
221 err = fdt_splice_struct_(fdt, *prop, 0, proplen);
222 if (err) {
223 /* Delete the string if we failed to add it */
224 if (!can_assume(NO_ROLLBACK) && allocated)
225 fdt_del_last_string_(fdt, name);
226 return err;
227 }
228
229 (*prop)->tag = cpu_to_fdt32(FDT_PROP);
230 (*prop)->nameoff = cpu_to_fdt32(namestroff);
231 (*prop)->len = cpu_to_fdt32(len);
232 return 0;
233}
234
235int fdt_set_name(void *fdt, int nodeoffset, const char *name)
236{
237 char *namep;
238 int oldlen, newlen;
239 int err;
240
241 FDT_RW_PROBE(fdt);
242
243 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
244 if (!namep)
245 return oldlen;
246
247 newlen = strlen(name);
248
249 err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1),
250 FDT_TAGALIGN(newlen+1));
251 if (err)
252 return err;
253
254 memcpy(namep, name, newlen+1);
255 return 0;
256}
257
258int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
259 int len, void **prop_data)
260{
261 struct fdt_property *prop;
262 int err;
263
264 FDT_RW_PROBE(fdt);
265
266 err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop);
267 if (err == -FDT_ERR_NOTFOUND)
268 err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
269 if (err)
270 return err;
271
272 *prop_data = prop->data;
273 return 0;
274}
275
276int fdt_setprop(void *fdt, int nodeoffset, const char *name,
277 const void *val, int len)
278{
279 void *prop_data;
280 int err;
281
282 err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
283 if (err)
284 return err;
285
286 if (len)
287 memcpy(prop_data, val, len);
288 return 0;
289}
290
291int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
292 const void *val, int len)
293{
294 struct fdt_property *prop;
295 int err, oldlen, newlen;
296
297 FDT_RW_PROBE(fdt);
298
299 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
300 if (prop) {
301 newlen = len + oldlen;
302 err = fdt_splice_struct_(fdt, prop->data,
303 FDT_TAGALIGN(oldlen),
304 FDT_TAGALIGN(newlen));
305 if (err)
306 return err;
307 prop->len = cpu_to_fdt32(newlen);
308 memcpy(prop->data + oldlen, val, len);
309 } else {
310 err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
311 if (err)
312 return err;
313 memcpy(prop->data, val, len);
314 }
315 return 0;
316}
317
318int fdt_delprop(void *fdt, int nodeoffset, const char *name)
319{
320 struct fdt_property *prop;
321 int len, proplen;
322
323 FDT_RW_PROBE(fdt);
324
325 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
326 if (!prop)
327 return len;
328
329 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
330 return fdt_splice_struct_(fdt, prop, proplen, 0);
331}
332
333int fdt_add_subnode_namelen(void *fdt, int parentoffset,
334 const char *name, int namelen)
335{
336 struct fdt_node_header *nh;
337 int offset, nextoffset;
338 int nodelen;
339 int err;
340 uint32_t tag;
341 fdt32_t *endtag;
342
343 FDT_RW_PROBE(fdt);
344
345 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
346 if (offset >= 0)
347 return -FDT_ERR_EXISTS;
348 else if (offset != -FDT_ERR_NOTFOUND)
349 return offset;
350
351 /* Try to place the new node after the parent's properties */
352 tag = fdt_next_tag(fdt, parentoffset, &nextoffset);
353 /* the fdt_subnode_offset_namelen() should ensure this never hits */
354 if (!can_assume(LIBFDT_FLAWLESS) && (tag != FDT_BEGIN_NODE))
355 return -FDT_ERR_INTERNAL;
356 do {
357 offset = nextoffset;
358 tag = fdt_next_tag(fdt, offset, &nextoffset);
359 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
360
361 nh = fdt_offset_ptr_w_(fdt, offset);
362 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
363
364 err = fdt_splice_struct_(fdt, nh, 0, nodelen);
365 if (err)
366 return err;
367
368 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
369 memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
370 memcpy(nh->name, name, namelen);
371 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
372 *endtag = cpu_to_fdt32(FDT_END_NODE);
373
374 return offset;
375}
376
377int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
378{
379 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
380}
381
382int fdt_del_node(void *fdt, int nodeoffset)
383{
384 int endoffset;
385
386 FDT_RW_PROBE(fdt);
387
388 endoffset = fdt_node_end_offset_(fdt, nodeoffset);
389 if (endoffset < 0)
390 return endoffset;
391
392 return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset),
393 endoffset - nodeoffset, 0);
394}
395
396static void fdt_packblocks_(const char *old, char *new,
397 int mem_rsv_size,
398 int struct_size,
399 int strings_size)
400{
401 int mem_rsv_off, struct_off, strings_off;
402
403 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
404 struct_off = mem_rsv_off + mem_rsv_size;
405 strings_off = struct_off + struct_size;
406
407 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
408 fdt_set_off_mem_rsvmap(new, mem_rsv_off);
409
410 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
411 fdt_set_off_dt_struct(new, struct_off);
412 fdt_set_size_dt_struct(new, struct_size);
413
414 memmove(new + strings_off, old + fdt_off_dt_strings(old), strings_size);
415 fdt_set_off_dt_strings(new, strings_off);
416 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
417}
418
419int fdt_open_into(const void *fdt, void *buf, int bufsize)
420{
421 int err;
422 int mem_rsv_size, struct_size;
423 int newsize;
424 const char *fdtstart = fdt;
425 const char *fdtend = fdtstart + fdt_totalsize(fdt);
426 char *tmp;
427
428 FDT_RO_PROBE(fdt);
429
430 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
431 * sizeof(struct fdt_reserve_entry);
432
433 if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
434 struct_size = fdt_size_dt_struct(fdt);
435 } else if (fdt_version(fdt) == 16) {
436 struct_size = 0;
437 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
438 ;
439 if (struct_size < 0)
440 return struct_size;
441 } else {
442 return -FDT_ERR_BADVERSION;
443 }
444
445 if (can_assume(LIBFDT_ORDER) ||
446 !fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) {
447 /* no further work necessary */
448 err = fdt_move(fdt, buf, bufsize);
449 if (err)
450 return err;
451 fdt_set_version(buf, 17);
452 fdt_set_size_dt_struct(buf, struct_size);
453 fdt_set_totalsize(buf, bufsize);
454 return 0;
455 }
456
457 /* Need to reorder */
458 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
459 + struct_size + fdt_size_dt_strings(fdt);
460
461 if (bufsize < newsize)
462 return -FDT_ERR_NOSPACE;
463
464 /* First attempt to build converted tree at beginning of buffer */
465 tmp = buf;
466 /* But if that overlaps with the old tree... */
467 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
468 /* Try right after the old tree instead */
469 tmp = (char *)(uintptr_t)fdtend;
470 if ((tmp + newsize) > ((char *)buf + bufsize))
471 return -FDT_ERR_NOSPACE;
472 }
473
474 fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size,
475 fdt_size_dt_strings(fdt));
476 memmove(buf, tmp, newsize);
477
478 fdt_set_magic(buf, FDT_MAGIC);
479 fdt_set_totalsize(buf, bufsize);
480 fdt_set_version(buf, 17);
481 fdt_set_last_comp_version(buf, 16);
482 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
483
484 return 0;
485}
486
487int fdt_pack(void *fdt)
488{
489 int mem_rsv_size;
490
491 FDT_RW_PROBE(fdt);
492
493 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
494 * sizeof(struct fdt_reserve_entry);
495 fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt),
496 fdt_size_dt_strings(fdt));
497 fdt_set_totalsize(fdt, fdt_data_size_(fdt));
498
499 return 0;
500}
1// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
2/*
3 * libfdt - Flat Device Tree manipulation
4 * Copyright (C) 2006 David Gibson, IBM Corporation.
5 */
6#include "libfdt_env.h"
7
8#include <fdt.h>
9#include <libfdt.h>
10
11#include "libfdt_internal.h"
12
13static int fdt_blocks_misordered_(const void *fdt,
14 int mem_rsv_size, int struct_size)
15{
16 return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
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
25static int fdt_rw_probe_(void *fdt)
26{
27 FDT_RO_PROBE(fdt);
28
29 if (fdt_version(fdt) < 17)
30 return -FDT_ERR_BADVERSION;
31 if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry),
32 fdt_size_dt_struct(fdt)))
33 return -FDT_ERR_BADLAYOUT;
34 if (fdt_version(fdt) > 17)
35 fdt_set_version(fdt, 17);
36
37 return 0;
38}
39
40#define FDT_RW_PROBE(fdt) \
41 { \
42 int err_; \
43 if ((err_ = fdt_rw_probe_(fdt)) != 0) \
44 return err_; \
45 }
46
47static inline int fdt_data_size_(void *fdt)
48{
49 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
50}
51
52static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen)
53{
54 char *p = splicepoint;
55 char *end = (char *)fdt + fdt_data_size_(fdt);
56
57 if (((p + oldlen) < p) || ((p + oldlen) > end))
58 return -FDT_ERR_BADOFFSET;
59 if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt))
60 return -FDT_ERR_BADOFFSET;
61 if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
62 return -FDT_ERR_NOSPACE;
63 memmove(p + newlen, p + oldlen, end - p - oldlen);
64 return 0;
65}
66
67static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p,
68 int oldn, int newn)
69{
70 int delta = (newn - oldn) * sizeof(*p);
71 int err;
72 err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
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
80static int fdt_splice_struct_(void *fdt, void *p,
81 int oldlen, int newlen)
82{
83 int delta = newlen - oldlen;
84 int err;
85
86 if ((err = fdt_splice_(fdt, p, oldlen, newlen)))
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
94/* Must only be used to roll back in case of error */
95static 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
102static int fdt_splice_string_(void *fdt, int newlen)
103{
104 void *p = (char *)fdt
105 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
106 int err;
107
108 if ((err = fdt_splice_(fdt, p, 0, newlen)))
109 return err;
110
111 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
112 return 0;
113}
114
115static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
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
123 *allocated = 0;
124
125 p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
126 if (p)
127 /* found it */
128 return (p - strtab);
129
130 new = strtab + fdt_size_dt_strings(fdt);
131 err = fdt_splice_string_(fdt, len);
132 if (err)
133 return err;
134
135 *allocated = 1;
136
137 memcpy(new, s, len);
138 return (new - strtab);
139}
140
141int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
142{
143 struct fdt_reserve_entry *re;
144 int err;
145
146 FDT_RW_PROBE(fdt);
147
148 re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt));
149 err = fdt_splice_mem_rsv_(fdt, re, 0, 1);
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
158int fdt_del_mem_rsv(void *fdt, int n)
159{
160 struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n);
161
162 FDT_RW_PROBE(fdt);
163
164 if (n >= fdt_num_mem_rsv(fdt))
165 return -FDT_ERR_NOTFOUND;
166
167 return fdt_splice_mem_rsv_(fdt, re, 1, 0);
168}
169
170static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name,
171 int len, struct fdt_property **prop)
172{
173 int oldlen;
174 int err;
175
176 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
177 if (!*prop)
178 return oldlen;
179
180 if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
181 FDT_TAGALIGN(len))))
182 return err;
183
184 (*prop)->len = cpu_to_fdt32(len);
185 return 0;
186}
187
188static int fdt_add_property_(void *fdt, int nodeoffset, const char *name,
189 int len, struct fdt_property **prop)
190{
191 int proplen;
192 int nextoffset;
193 int namestroff;
194 int err;
195 int allocated;
196
197 if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
198 return nextoffset;
199
200 namestroff = fdt_find_add_string_(fdt, name, &allocated);
201 if (namestroff < 0)
202 return namestroff;
203
204 *prop = fdt_offset_ptr_w_(fdt, nextoffset);
205 proplen = sizeof(**prop) + FDT_TAGALIGN(len);
206
207 err = fdt_splice_struct_(fdt, *prop, 0, proplen);
208 if (err) {
209 if (allocated)
210 fdt_del_last_string_(fdt, name);
211 return err;
212 }
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
220int fdt_set_name(void *fdt, int nodeoffset, const char *name)
221{
222 char *namep;
223 int oldlen, newlen;
224 int err;
225
226 FDT_RW_PROBE(fdt);
227
228 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
229 if (!namep)
230 return oldlen;
231
232 newlen = strlen(name);
233
234 err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1),
235 FDT_TAGALIGN(newlen+1));
236 if (err)
237 return err;
238
239 memcpy(namep, name, newlen+1);
240 return 0;
241}
242
243int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
244 int len, void **prop_data)
245{
246 struct fdt_property *prop;
247 int err;
248
249 FDT_RW_PROBE(fdt);
250
251 err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop);
252 if (err == -FDT_ERR_NOTFOUND)
253 err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
254 if (err)
255 return err;
256
257 *prop_data = prop->data;
258 return 0;
259}
260
261int 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
271 if (len)
272 memcpy(prop_data, val, len);
273 return 0;
274}
275
276int 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
282 FDT_RW_PROBE(fdt);
283
284 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
285 if (prop) {
286 newlen = len + oldlen;
287 err = fdt_splice_struct_(fdt, prop->data,
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 {
295 err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
296 if (err)
297 return err;
298 memcpy(prop->data, val, len);
299 }
300 return 0;
301}
302
303int fdt_delprop(void *fdt, int nodeoffset, const char *name)
304{
305 struct fdt_property *prop;
306 int len, proplen;
307
308 FDT_RW_PROBE(fdt);
309
310 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
311 if (!prop)
312 return len;
313
314 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
315 return fdt_splice_struct_(fdt, prop, proplen, 0);
316}
317
318int 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;
326 fdt32_t *endtag;
327
328 FDT_RW_PROBE(fdt);
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);
341 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
342
343 nh = fdt_offset_ptr_w_(fdt, offset);
344 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
345
346 err = fdt_splice_struct_(fdt, nh, 0, nodelen);
347 if (err)
348 return err;
349
350 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
351 memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
352 memcpy(nh->name, name, namelen);
353 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
354 *endtag = cpu_to_fdt32(FDT_END_NODE);
355
356 return offset;
357}
358
359int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
360{
361 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
362}
363
364int fdt_del_node(void *fdt, int nodeoffset)
365{
366 int endoffset;
367
368 FDT_RW_PROBE(fdt);
369
370 endoffset = fdt_node_end_offset_(fdt, nodeoffset);
371 if (endoffset < 0)
372 return endoffset;
373
374 return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset),
375 endoffset - nodeoffset, 0);
376}
377
378static void fdt_packblocks_(const char *old, char *new,
379 int mem_rsv_size, int struct_size)
380{
381 int mem_rsv_off, struct_off, strings_off;
382
383 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
384 struct_off = mem_rsv_off + mem_rsv_size;
385 strings_off = struct_off + struct_size;
386
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);
389
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);
393
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));
398}
399
400int fdt_open_into(const void *fdt, void *buf, int bufsize)
401{
402 int err;
403 int mem_rsv_size, struct_size;
404 int newsize;
405 const char *fdtstart = fdt;
406 const char *fdtend = fdtstart + fdt_totalsize(fdt);
407 char *tmp;
408
409 FDT_RO_PROBE(fdt);
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 ;
420 if (struct_size < 0)
421 return struct_size;
422 }
423
424 if (!fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) {
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 */
436 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
437 + struct_size + fdt_size_dt_strings(fdt);
438
439 if (bufsize < newsize)
440 return -FDT_ERR_NOSPACE;
441
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))
449 return -FDT_ERR_NOSPACE;
450 }
451
452 fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size);
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
464int fdt_pack(void *fdt)
465{
466 int mem_rsv_size;
467
468 FDT_RW_PROBE(fdt);
469
470 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
471 * sizeof(struct fdt_reserve_entry);
472 fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
473 fdt_set_totalsize(fdt, fdt_data_size_(fdt));
474
475 return 0;
476}