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6#include <libfdt_env.h>
7
8#ifndef USE_HOSTCC
9#include <fdt.h>
10#include <libfdt.h>
11#else
12#include "fdt_host.h"
13#endif
14
15#include "libfdt_internal.h"
16
17static int _fdt_blocks_misordered(const void *fdt,
18 int mem_rsv_size, int struct_size)
19{
20 return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
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
29static int _fdt_rw_check_header(void *fdt)
30{
31 FDT_CHECK_HEADER(fdt);
32
33 if (fdt_version(fdt) < 17)
34 return -FDT_ERR_BADVERSION;
35 if (_fdt_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry),
36 fdt_size_dt_struct(fdt)))
37 return -FDT_ERR_BADLAYOUT;
38 if (fdt_version(fdt) > 17)
39 fdt_set_version(fdt, 17);
40
41 return 0;
42}
43
44#define FDT_RW_CHECK_HEADER(fdt) \
45 { \
46 int __err; \
47 if ((__err = _fdt_rw_check_header(fdt)) != 0) \
48 return __err; \
49 }
50
51static inline int _fdt_data_size(void *fdt)
52{
53 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
54}
55
56static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen)
57{
58 char *p = splicepoint;
59 char *end = (char *)fdt + _fdt_data_size(fdt);
60
61 if (((p + oldlen) < p) || ((p + oldlen) > end))
62 return -FDT_ERR_BADOFFSET;
63 if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt))
64 return -FDT_ERR_BADOFFSET;
65 if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
66 return -FDT_ERR_NOSPACE;
67 memmove(p + newlen, p + oldlen, end - p - oldlen);
68 return 0;
69}
70
71static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
72 int oldn, int newn)
73{
74 int delta = (newn - oldn) * sizeof(*p);
75 int err;
76 err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
77 if (err)
78 return err;
79 fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
80 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
81 return 0;
82}
83
84static int _fdt_splice_struct(void *fdt, void *p,
85 int oldlen, int newlen)
86{
87 int delta = newlen - oldlen;
88 int err;
89
90 if ((err = _fdt_splice(fdt, p, oldlen, newlen)))
91 return err;
92
93 fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
94 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
95 return 0;
96}
97
98static int _fdt_splice_string(void *fdt, int newlen)
99{
100 void *p = (char *)fdt
101 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
102 int err;
103
104 if ((err = _fdt_splice(fdt, p, 0, newlen)))
105 return err;
106
107 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
108 return 0;
109}
110
111static int _fdt_find_add_string(void *fdt, const char *s)
112{
113 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
114 const char *p;
115 char *new;
116 int len = strlen(s) + 1;
117 int err;
118
119 p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
120 if (p)
121
122 return (p - strtab);
123
124 new = strtab + fdt_size_dt_strings(fdt);
125 err = _fdt_splice_string(fdt, len);
126 if (err)
127 return err;
128
129 memcpy(new, s, len);
130 return (new - strtab);
131}
132
133int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
134{
135 struct fdt_reserve_entry *re;
136 int err;
137
138 FDT_RW_CHECK_HEADER(fdt);
139
140 re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
141 err = _fdt_splice_mem_rsv(fdt, re, 0, 1);
142 if (err)
143 return err;
144
145 re->address = cpu_to_fdt64(address);
146 re->size = cpu_to_fdt64(size);
147 return 0;
148}
149
150int fdt_del_mem_rsv(void *fdt, int n)
151{
152 struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
153
154 FDT_RW_CHECK_HEADER(fdt);
155
156 if (n >= fdt_num_mem_rsv(fdt))
157 return -FDT_ERR_NOTFOUND;
158
159 return _fdt_splice_mem_rsv(fdt, re, 1, 0);
160}
161
162static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name,
163 int len, struct fdt_property **prop)
164{
165 int oldlen;
166 int err;
167
168 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
169 if (!*prop)
170 return oldlen;
171
172 if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
173 FDT_TAGALIGN(len))))
174 return err;
175
176 (*prop)->len = cpu_to_fdt32(len);
177 return 0;
178}
179
180static int _fdt_add_property(void *fdt, int nodeoffset, const char *name,
181 int len, struct fdt_property **prop)
182{
183 int proplen;
184 int nextoffset;
185 int namestroff;
186 int err;
187
188 if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
189 return nextoffset;
190
191 namestroff = _fdt_find_add_string(fdt, name);
192 if (namestroff < 0)
193 return namestroff;
194
195 *prop = _fdt_offset_ptr_w(fdt, nextoffset);
196 proplen = sizeof(**prop) + FDT_TAGALIGN(len);
197
198 err = _fdt_splice_struct(fdt, *prop, 0, proplen);
199 if (err)
200 return err;
201
202 (*prop)->tag = cpu_to_fdt32(FDT_PROP);
203 (*prop)->nameoff = cpu_to_fdt32(namestroff);
204 (*prop)->len = cpu_to_fdt32(len);
205 return 0;
206}
207
208int fdt_set_name(void *fdt, int nodeoffset, const char *name)
209{
210 char *namep;
211 int oldlen, newlen;
212 int err;
213
214 FDT_RW_CHECK_HEADER(fdt);
215
216 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
217 if (!namep)
218 return oldlen;
219
220 newlen = strlen(name);
221
222 err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1),
223 FDT_TAGALIGN(newlen+1));
224 if (err)
225 return err;
226
227 memcpy(namep, name, newlen+1);
228 return 0;
229}
230
231int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
232 int len, void **prop_data)
233{
234 struct fdt_property *prop;
235 int err;
236
237 FDT_RW_CHECK_HEADER(fdt);
238
239 err = _fdt_resize_property(fdt, nodeoffset, name, len, &prop);
240 if (err == -FDT_ERR_NOTFOUND)
241 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
242 if (err)
243 return err;
244
245 *prop_data = prop->data;
246 return 0;
247}
248
249int fdt_setprop(void *fdt, int nodeoffset, const char *name,
250 const void *val, int len)
251{
252 void *prop_data;
253 int err;
254
255 err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
256 if (err)
257 return err;
258
259 if (len)
260 memcpy(prop_data, val, len);
261 return 0;
262}
263
264int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
265 const void *val, int len)
266{
267 struct fdt_property *prop;
268 int err, oldlen, newlen;
269
270 FDT_RW_CHECK_HEADER(fdt);
271
272 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
273 if (prop) {
274 newlen = len + oldlen;
275 err = _fdt_splice_struct(fdt, prop->data,
276 FDT_TAGALIGN(oldlen),
277 FDT_TAGALIGN(newlen));
278 if (err)
279 return err;
280 prop->len = cpu_to_fdt32(newlen);
281 memcpy(prop->data + oldlen, val, len);
282 } else {
283 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
284 if (err)
285 return err;
286 memcpy(prop->data, val, len);
287 }
288 return 0;
289}
290
291int fdt_delprop(void *fdt, int nodeoffset, const char *name)
292{
293 struct fdt_property *prop;
294 int len, proplen;
295
296 FDT_RW_CHECK_HEADER(fdt);
297
298 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
299 if (!prop)
300 return len;
301
302 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
303 return _fdt_splice_struct(fdt, prop, proplen, 0);
304}
305
306int fdt_add_subnode_namelen(void *fdt, int parentoffset,
307 const char *name, int namelen)
308{
309 struct fdt_node_header *nh;
310 int offset, nextoffset;
311 int nodelen;
312 int err;
313 uint32_t tag;
314 fdt32_t *endtag;
315
316 FDT_RW_CHECK_HEADER(fdt);
317
318 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
319 if (offset >= 0)
320 return -FDT_ERR_EXISTS;
321 else if (offset != -FDT_ERR_NOTFOUND)
322 return offset;
323
324
325 fdt_next_tag(fdt, parentoffset, &nextoffset);
326 do {
327 offset = nextoffset;
328 tag = fdt_next_tag(fdt, offset, &nextoffset);
329 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
330
331 nh = _fdt_offset_ptr_w(fdt, offset);
332 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
333
334 err = _fdt_splice_struct(fdt, nh, 0, nodelen);
335 if (err)
336 return err;
337
338 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
339 memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
340 memcpy(nh->name, name, namelen);
341 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
342 *endtag = cpu_to_fdt32(FDT_END_NODE);
343
344 return offset;
345}
346
347int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
348{
349 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
350}
351
352int fdt_del_node(void *fdt, int nodeoffset)
353{
354 int endoffset;
355
356 FDT_RW_CHECK_HEADER(fdt);
357
358 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
359 if (endoffset < 0)
360 return endoffset;
361
362 return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
363 endoffset - nodeoffset, 0);
364}
365
366static void _fdt_packblocks(const char *old, char *new,
367 int mem_rsv_size, int struct_size)
368{
369 int mem_rsv_off, struct_off, strings_off;
370
371 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
372 struct_off = mem_rsv_off + mem_rsv_size;
373 strings_off = struct_off + struct_size;
374
375 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
376 fdt_set_off_mem_rsvmap(new, mem_rsv_off);
377
378 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
379 fdt_set_off_dt_struct(new, struct_off);
380 fdt_set_size_dt_struct(new, struct_size);
381
382 memmove(new + strings_off, old + fdt_off_dt_strings(old),
383 fdt_size_dt_strings(old));
384 fdt_set_off_dt_strings(new, strings_off);
385 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
386}
387
388int fdt_open_into(const void *fdt, void *buf, int bufsize)
389{
390 int err;
391 int mem_rsv_size, struct_size;
392 int newsize;
393 const char *fdtstart = fdt;
394 const char *fdtend = fdtstart + fdt_totalsize(fdt);
395 char *tmp;
396
397 FDT_CHECK_HEADER(fdt);
398
399 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
400 * sizeof(struct fdt_reserve_entry);
401
402 if (fdt_version(fdt) >= 17) {
403 struct_size = fdt_size_dt_struct(fdt);
404 } else {
405 struct_size = 0;
406 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
407 ;
408 if (struct_size < 0)
409 return struct_size;
410 }
411
412 if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
413
414 err = fdt_move(fdt, buf, bufsize);
415 if (err)
416 return err;
417 fdt_set_version(buf, 17);
418 fdt_set_size_dt_struct(buf, struct_size);
419 fdt_set_totalsize(buf, bufsize);
420 return 0;
421 }
422
423
424 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
425 + struct_size + fdt_size_dt_strings(fdt);
426
427 if (bufsize < newsize)
428 return -FDT_ERR_NOSPACE;
429
430
431 tmp = buf;
432
433 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
434
435 tmp = (char *)(uintptr_t)fdtend;
436 if ((tmp + newsize) > ((char *)buf + bufsize))
437 return -FDT_ERR_NOSPACE;
438 }
439
440 _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size);
441 memmove(buf, tmp, newsize);
442
443 fdt_set_magic(buf, FDT_MAGIC);
444 fdt_set_totalsize(buf, bufsize);
445 fdt_set_version(buf, 17);
446 fdt_set_last_comp_version(buf, 16);
447 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
448
449 return 0;
450}
451
452int fdt_pack(void *fdt)
453{
454 int mem_rsv_size;
455
456 FDT_RW_CHECK_HEADER(fdt);
457
458 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
459 * sizeof(struct fdt_reserve_entry);
460 _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
461 fdt_set_totalsize(fdt, _fdt_data_size(fdt));
462
463 return 0;
464}
465
466int fdt_remove_unused_strings(const void *old, void *new)
467{
468 const struct fdt_property *old_prop;
469 struct fdt_property *new_prop;
470 int size = fdt_totalsize(old);
471 int next_offset, offset;
472 const char *str;
473 int ret;
474 int tag = FDT_PROP;
475
476
477 memcpy(new, old, size);
478 fdt_set_size_dt_strings(new, 0);
479
480
481 for (offset = 0; tag != FDT_END; offset = next_offset) {
482 tag = fdt_next_tag(old, offset, &next_offset);
483 if (tag != FDT_PROP)
484 continue;
485 old_prop = fdt_get_property_by_offset(old, offset, NULL);
486 new_prop = (struct fdt_property *)(unsigned long)
487 fdt_get_property_by_offset(new, offset, NULL);
488 str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff));
489 ret = _fdt_find_add_string(new, str);
490 if (ret < 0)
491 return ret;
492 new_prop->nameoff = cpu_to_fdt32(ret);
493 }
494
495 return 0;
496}
497
