2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
4 * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause
6 #include <libfdt_env.h>
15 #include "libfdt_internal.h"
17 static int _fdt_blocks_misordered(const void *fdt,
18 int mem_rsv_size, int struct_size)
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)));
29 static int _fdt_rw_check_header(void *fdt)
31 FDT_CHECK_HEADER(fdt);
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);
44 #define FDT_RW_CHECK_HEADER(fdt) \
47 if ((__err = _fdt_rw_check_header(fdt)) != 0) \
51 static inline int _fdt_data_size(void *fdt)
53 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
56 static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen)
58 char *p = splicepoint;
59 char *end = (char *)fdt + _fdt_data_size(fdt);
61 if (((p + oldlen) < p) || ((p + oldlen) > end))
62 return -FDT_ERR_BADOFFSET;
63 if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
64 return -FDT_ERR_NOSPACE;
65 memmove(p + newlen, p + oldlen, end - p - oldlen);
69 static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
72 int delta = (newn - oldn) * sizeof(*p);
74 err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
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);
82 static int _fdt_splice_struct(void *fdt, void *p,
83 int oldlen, int newlen)
85 int delta = newlen - oldlen;
88 if ((err = _fdt_splice(fdt, p, oldlen, newlen)))
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);
96 static int _fdt_splice_string(void *fdt, int newlen)
99 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
102 if ((err = _fdt_splice(fdt, p, 0, newlen)))
105 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
109 static int _fdt_find_add_string(void *fdt, const char *s)
111 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
114 int len = strlen(s) + 1;
117 p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
122 new = strtab + fdt_size_dt_strings(fdt);
123 err = _fdt_splice_string(fdt, len);
128 return (new - strtab);
131 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
133 struct fdt_reserve_entry *re;
136 FDT_RW_CHECK_HEADER(fdt);
138 re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
139 err = _fdt_splice_mem_rsv(fdt, re, 0, 1);
143 re->address = cpu_to_fdt64(address);
144 re->size = cpu_to_fdt64(size);
148 int fdt_del_mem_rsv(void *fdt, int n)
150 struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
152 FDT_RW_CHECK_HEADER(fdt);
154 if (n >= fdt_num_mem_rsv(fdt))
155 return -FDT_ERR_NOTFOUND;
157 return _fdt_splice_mem_rsv(fdt, re, 1, 0);
160 static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name,
161 int len, struct fdt_property **prop)
166 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
170 if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
174 (*prop)->len = cpu_to_fdt32(len);
178 static int _fdt_add_property(void *fdt, int nodeoffset, const char *name,
179 int len, struct fdt_property **prop)
186 if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
189 namestroff = _fdt_find_add_string(fdt, name);
193 *prop = _fdt_offset_ptr_w(fdt, nextoffset);
194 proplen = sizeof(**prop) + FDT_TAGALIGN(len);
196 err = _fdt_splice_struct(fdt, *prop, 0, proplen);
200 (*prop)->tag = cpu_to_fdt32(FDT_PROP);
201 (*prop)->nameoff = cpu_to_fdt32(namestroff);
202 (*prop)->len = cpu_to_fdt32(len);
206 int fdt_set_name(void *fdt, int nodeoffset, const char *name)
212 FDT_RW_CHECK_HEADER(fdt);
214 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
218 newlen = strlen(name);
220 err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1),
221 FDT_TAGALIGN(newlen+1));
225 memcpy(namep, name, newlen+1);
229 int fdt_setprop(void *fdt, int nodeoffset, const char *name,
230 const void *val, int len)
232 struct fdt_property *prop;
235 FDT_RW_CHECK_HEADER(fdt);
237 err = _fdt_resize_property(fdt, nodeoffset, name, len, &prop);
238 if (err == -FDT_ERR_NOTFOUND)
239 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
243 memcpy(prop->data, val, len);
247 int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
248 const void *val, int len)
250 struct fdt_property *prop;
251 int err, oldlen, newlen;
253 FDT_RW_CHECK_HEADER(fdt);
255 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
257 newlen = len + oldlen;
258 err = _fdt_splice_struct(fdt, prop->data,
259 FDT_TAGALIGN(oldlen),
260 FDT_TAGALIGN(newlen));
263 prop->len = cpu_to_fdt32(newlen);
264 memcpy(prop->data + oldlen, val, len);
266 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
269 memcpy(prop->data, val, len);
274 int fdt_delprop(void *fdt, int nodeoffset, const char *name)
276 struct fdt_property *prop;
279 FDT_RW_CHECK_HEADER(fdt);
281 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
285 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
286 return _fdt_splice_struct(fdt, prop, proplen, 0);
289 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
290 const char *name, int namelen)
292 struct fdt_node_header *nh;
293 int offset, nextoffset;
299 FDT_RW_CHECK_HEADER(fdt);
301 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
303 return -FDT_ERR_EXISTS;
304 else if (offset != -FDT_ERR_NOTFOUND)
307 /* Try to place the new node after the parent's properties */
308 fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
311 tag = fdt_next_tag(fdt, offset, &nextoffset);
312 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
314 nh = _fdt_offset_ptr_w(fdt, offset);
315 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
317 err = _fdt_splice_struct(fdt, nh, 0, nodelen);
321 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
322 memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
323 memcpy(nh->name, name, namelen);
324 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
325 *endtag = cpu_to_fdt32(FDT_END_NODE);
330 int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
332 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
335 int fdt_del_node(void *fdt, int nodeoffset)
339 FDT_RW_CHECK_HEADER(fdt);
341 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
345 return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
346 endoffset - nodeoffset, 0);
349 static void _fdt_packblocks(const char *old, char *new,
350 int mem_rsv_size, int struct_size)
352 int mem_rsv_off, struct_off, strings_off;
354 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
355 struct_off = mem_rsv_off + mem_rsv_size;
356 strings_off = struct_off + struct_size;
358 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
359 fdt_set_off_mem_rsvmap(new, mem_rsv_off);
361 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
362 fdt_set_off_dt_struct(new, struct_off);
363 fdt_set_size_dt_struct(new, struct_size);
365 memmove(new + strings_off, old + fdt_off_dt_strings(old),
366 fdt_size_dt_strings(old));
367 fdt_set_off_dt_strings(new, strings_off);
368 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
371 int fdt_open_into(const void *fdt, void *buf, int bufsize)
374 int mem_rsv_size, struct_size;
376 const char *fdtstart = fdt;
377 const char *fdtend = fdtstart + fdt_totalsize(fdt);
380 FDT_CHECK_HEADER(fdt);
382 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
383 * sizeof(struct fdt_reserve_entry);
385 if (fdt_version(fdt) >= 17) {
386 struct_size = fdt_size_dt_struct(fdt);
389 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
395 if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
396 /* no further work necessary */
397 err = fdt_move(fdt, buf, bufsize);
400 fdt_set_version(buf, 17);
401 fdt_set_size_dt_struct(buf, struct_size);
402 fdt_set_totalsize(buf, bufsize);
406 /* Need to reorder */
407 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
408 + struct_size + fdt_size_dt_strings(fdt);
410 if (bufsize < newsize)
411 return -FDT_ERR_NOSPACE;
413 /* First attempt to build converted tree at beginning of buffer */
415 /* But if that overlaps with the old tree... */
416 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
417 /* Try right after the old tree instead */
418 tmp = (char *)(uintptr_t)fdtend;
419 if ((tmp + newsize) > ((char *)buf + bufsize))
420 return -FDT_ERR_NOSPACE;
423 _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size);
424 memmove(buf, tmp, newsize);
426 fdt_set_magic(buf, FDT_MAGIC);
427 fdt_set_totalsize(buf, bufsize);
428 fdt_set_version(buf, 17);
429 fdt_set_last_comp_version(buf, 16);
430 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
435 int fdt_pack(void *fdt)
439 FDT_RW_CHECK_HEADER(fdt);
441 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
442 * sizeof(struct fdt_reserve_entry);
443 _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
444 fdt_set_totalsize(fdt, _fdt_data_size(fdt));
449 int fdt_remove_unused_strings(const void *old, void *new)
451 const struct fdt_property *old_prop;
452 struct fdt_property *new_prop;
453 int size = fdt_totalsize(old);
454 int next_offset, offset;
459 /* Make a copy and remove the strings */
460 memcpy(new, old, size);
461 fdt_set_size_dt_strings(new, 0);
463 /* Add every property name back into the new string table */
464 for (offset = 0; tag != FDT_END; offset = next_offset) {
465 tag = fdt_next_tag(old, offset, &next_offset);
468 old_prop = fdt_get_property_by_offset(old, offset, NULL);
469 new_prop = (struct fdt_property *)(unsigned long)
470 fdt_get_property_by_offset(new, offset, NULL);
471 str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff));
472 ret = _fdt_find_add_string(new, str);
475 new_prop->nameoff = cpu_to_fdt32(ret);