1
2
3
4
5
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(void *fdt, int nodeoffset, const char *name,
232 const void *val, int len)
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 memcpy(prop->data, val, len);
246 return 0;
247}
248
249int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
250 const void *val, int len)
251{
252 struct fdt_property *prop;
253 int err, oldlen, newlen;
254
255 FDT_RW_CHECK_HEADER(fdt);
256
257 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
258 if (prop) {
259 newlen = len + oldlen;
260 err = _fdt_splice_struct(fdt, prop->data,
261 FDT_TAGALIGN(oldlen),
262 FDT_TAGALIGN(newlen));
263 if (err)
264 return err;
265 prop->len = cpu_to_fdt32(newlen);
266 memcpy(prop->data + oldlen, val, len);
267 } else {
268 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
269 if (err)
270 return err;
271 memcpy(prop->data, val, len);
272 }
273 return 0;
274}
275
276int fdt_delprop(void *fdt, int nodeoffset, const char *name)
277{
278 struct fdt_property *prop;
279 int len, proplen;
280
281 FDT_RW_CHECK_HEADER(fdt);
282
283 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
284 if (!prop)
285 return len;
286
287 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
288 return _fdt_splice_struct(fdt, prop, proplen, 0);
289}
290
291int fdt_add_subnode_namelen(void *fdt, int parentoffset,
292 const char *name, int namelen)
293{
294 struct fdt_node_header *nh;
295 int offset, nextoffset;
296 int nodelen;
297 int err;
298 uint32_t tag;
299 fdt32_t *endtag;
300
301 FDT_RW_CHECK_HEADER(fdt);
302
303 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
304 if (offset >= 0)
305 return -FDT_ERR_EXISTS;
306 else if (offset != -FDT_ERR_NOTFOUND)
307 return offset;
308
309
310 fdt_next_tag(fdt, parentoffset, &nextoffset);
311 do {
312 offset = nextoffset;
313 tag = fdt_next_tag(fdt, offset, &nextoffset);
314 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
315
316 nh = _fdt_offset_ptr_w(fdt, offset);
317 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
318
319 err = _fdt_splice_struct(fdt, nh, 0, nodelen);
320 if (err)
321 return err;
322
323 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
324 memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
325 memcpy(nh->name, name, namelen);
326 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
327 *endtag = cpu_to_fdt32(FDT_END_NODE);
328
329 return offset;
330}
331
332int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
333{
334 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
335}
336
337int fdt_del_node(void *fdt, int nodeoffset)
338{
339 int endoffset;
340
341 FDT_RW_CHECK_HEADER(fdt);
342
343 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
344 if (endoffset < 0)
345 return endoffset;
346
347 return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
348 endoffset - nodeoffset, 0);
349}
350
351static void _fdt_packblocks(const char *old, char *new,
352 int mem_rsv_size, int struct_size)
353{
354 int mem_rsv_off, struct_off, strings_off;
355
356 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
357 struct_off = mem_rsv_off + mem_rsv_size;
358 strings_off = struct_off + struct_size;
359
360 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
361 fdt_set_off_mem_rsvmap(new, mem_rsv_off);
362
363 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
364 fdt_set_off_dt_struct(new, struct_off);
365 fdt_set_size_dt_struct(new, struct_size);
366
367 memmove(new + strings_off, old + fdt_off_dt_strings(old),
368 fdt_size_dt_strings(old));
369 fdt_set_off_dt_strings(new, strings_off);
370 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
371}
372
373int fdt_open_into(const void *fdt, void *buf, int bufsize)
374{
375 int err;
376 int mem_rsv_size, struct_size;
377 int newsize;
378 const char *fdtstart = fdt;
379 const char *fdtend = fdtstart + fdt_totalsize(fdt);
380 char *tmp;
381
382 FDT_CHECK_HEADER(fdt);
383
384 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
385 * sizeof(struct fdt_reserve_entry);
386
387 if (fdt_version(fdt) >= 17) {
388 struct_size = fdt_size_dt_struct(fdt);
389 } else {
390 struct_size = 0;
391 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
392 ;
393 if (struct_size < 0)
394 return struct_size;
395 }
396
397 if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
398
399 err = fdt_move(fdt, buf, bufsize);
400 if (err)
401 return err;
402 fdt_set_version(buf, 17);
403 fdt_set_size_dt_struct(buf, struct_size);
404 fdt_set_totalsize(buf, bufsize);
405 return 0;
406 }
407
408
409 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
410 + struct_size + fdt_size_dt_strings(fdt);
411
412 if (bufsize < newsize)
413 return -FDT_ERR_NOSPACE;
414
415
416 tmp = buf;
417
418 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
419
420 tmp = (char *)(uintptr_t)fdtend;
421 if ((tmp + newsize) > ((char *)buf + bufsize))
422 return -FDT_ERR_NOSPACE;
423 }
424
425 _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size);
426 memmove(buf, tmp, newsize);
427
428 fdt_set_magic(buf, FDT_MAGIC);
429 fdt_set_totalsize(buf, bufsize);
430 fdt_set_version(buf, 17);
431 fdt_set_last_comp_version(buf, 16);
432 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
433
434 return 0;
435}
436
437int fdt_pack(void *fdt)
438{
439 int mem_rsv_size;
440
441 FDT_RW_CHECK_HEADER(fdt);
442
443 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
444 * sizeof(struct fdt_reserve_entry);
445 _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
446 fdt_set_totalsize(fdt, _fdt_data_size(fdt));
447
448 return 0;
449}
450
451int fdt_remove_unused_strings(const void *old, void *new)
452{
453 const struct fdt_property *old_prop;
454 struct fdt_property *new_prop;
455 int size = fdt_totalsize(old);
456 int next_offset, offset;
457 const char *str;
458 int ret;
459 int tag = FDT_PROP;
460
461
462 memcpy(new, old, size);
463 fdt_set_size_dt_strings(new, 0);
464
465
466 for (offset = 0; tag != FDT_END; offset = next_offset) {
467 tag = fdt_next_tag(old, offset, &next_offset);
468 if (tag != FDT_PROP)
469 continue;
470 old_prop = fdt_get_property_by_offset(old, offset, NULL);
471 new_prop = (struct fdt_property *)(unsigned long)
472 fdt_get_property_by_offset(new, offset, NULL);
473 str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff));
474 ret = _fdt_find_add_string(new, str);
475 if (ret < 0)
476 return ret;
477 new_prop->nameoff = cpu_to_fdt32(ret);
478 }
479
480 return 0;
481}
482