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 ((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);
71 static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
74 int delta = (newn - oldn) * sizeof(*p);
76 err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
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);
84 static int _fdt_splice_struct(void *fdt, void *p,
85 int oldlen, int newlen)
87 int delta = newlen - oldlen;
90 if ((err = _fdt_splice(fdt, p, oldlen, newlen)))
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);
98 static int _fdt_splice_string(void *fdt, int newlen)
100 void *p = (char *)fdt
101 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
104 if ((err = _fdt_splice(fdt, p, 0, newlen)))
107 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
111 static int _fdt_find_add_string(void *fdt, const char *s)
113 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
116 int len = strlen(s) + 1;
119 p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
124 new = strtab + fdt_size_dt_strings(fdt);
125 err = _fdt_splice_string(fdt, len);
130 return (new - strtab);
133 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
135 struct fdt_reserve_entry *re;
138 FDT_RW_CHECK_HEADER(fdt);
140 re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
141 err = _fdt_splice_mem_rsv(fdt, re, 0, 1);
145 re->address = cpu_to_fdt64(address);
146 re->size = cpu_to_fdt64(size);
150 int fdt_del_mem_rsv(void *fdt, int n)
152 struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
154 FDT_RW_CHECK_HEADER(fdt);
156 if (n >= fdt_num_mem_rsv(fdt))
157 return -FDT_ERR_NOTFOUND;
159 return _fdt_splice_mem_rsv(fdt, re, 1, 0);
162 static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name,
163 int len, struct fdt_property **prop)
168 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
172 if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
176 (*prop)->len = cpu_to_fdt32(len);
180 static int _fdt_add_property(void *fdt, int nodeoffset, const char *name,
181 int len, struct fdt_property **prop)
188 if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
191 namestroff = _fdt_find_add_string(fdt, name);
195 *prop = _fdt_offset_ptr_w(fdt, nextoffset);
196 proplen = sizeof(**prop) + FDT_TAGALIGN(len);
198 err = _fdt_splice_struct(fdt, *prop, 0, proplen);
202 (*prop)->tag = cpu_to_fdt32(FDT_PROP);
203 (*prop)->nameoff = cpu_to_fdt32(namestroff);
204 (*prop)->len = cpu_to_fdt32(len);
208 int fdt_set_name(void *fdt, int nodeoffset, const char *name)
214 FDT_RW_CHECK_HEADER(fdt);
216 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
220 newlen = strlen(name);
222 err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1),
223 FDT_TAGALIGN(newlen+1));
227 memcpy(namep, name, newlen+1);
231 int fdt_setprop(void *fdt, int nodeoffset, const char *name,
232 const void *val, int len)
234 struct fdt_property *prop;
237 FDT_RW_CHECK_HEADER(fdt);
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);
245 memcpy(prop->data, val, len);
249 int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
250 const void *val, int len)
252 struct fdt_property *prop;
253 int err, oldlen, newlen;
255 FDT_RW_CHECK_HEADER(fdt);
257 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
259 newlen = len + oldlen;
260 err = _fdt_splice_struct(fdt, prop->data,
261 FDT_TAGALIGN(oldlen),
262 FDT_TAGALIGN(newlen));
265 prop->len = cpu_to_fdt32(newlen);
266 memcpy(prop->data + oldlen, val, len);
268 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
271 memcpy(prop->data, val, len);
276 int fdt_delprop(void *fdt, int nodeoffset, const char *name)
278 struct fdt_property *prop;
281 FDT_RW_CHECK_HEADER(fdt);
283 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
287 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
288 return _fdt_splice_struct(fdt, prop, proplen, 0);
291 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
292 const char *name, int namelen)
294 struct fdt_node_header *nh;
295 int offset, nextoffset;
301 FDT_RW_CHECK_HEADER(fdt);
303 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
305 return -FDT_ERR_EXISTS;
306 else if (offset != -FDT_ERR_NOTFOUND)
309 /* Try to place the new node after the parent's properties */
310 fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
313 tag = fdt_next_tag(fdt, offset, &nextoffset);
314 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
316 nh = _fdt_offset_ptr_w(fdt, offset);
317 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
319 err = _fdt_splice_struct(fdt, nh, 0, nodelen);
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);
332 int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
334 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
337 int fdt_del_node(void *fdt, int nodeoffset)
341 FDT_RW_CHECK_HEADER(fdt);
343 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
347 return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
348 endoffset - nodeoffset, 0);
351 static void _fdt_packblocks(const char *old, char *new,
352 int mem_rsv_size, int struct_size)
354 int mem_rsv_off, struct_off, strings_off;
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;
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);
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);
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));
373 int fdt_open_into(const void *fdt, void *buf, int bufsize)
376 int mem_rsv_size, struct_size;
378 const char *fdtstart = fdt;
379 const char *fdtend = fdtstart + fdt_totalsize(fdt);
382 FDT_CHECK_HEADER(fdt);
384 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
385 * sizeof(struct fdt_reserve_entry);
387 if (fdt_version(fdt) >= 17) {
388 struct_size = fdt_size_dt_struct(fdt);
391 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
397 if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
398 /* no further work necessary */
399 err = fdt_move(fdt, buf, bufsize);
402 fdt_set_version(buf, 17);
403 fdt_set_size_dt_struct(buf, struct_size);
404 fdt_set_totalsize(buf, bufsize);
408 /* Need to reorder */
409 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
410 + struct_size + fdt_size_dt_strings(fdt);
412 if (bufsize < newsize)
413 return -FDT_ERR_NOSPACE;
415 /* First attempt to build converted tree at beginning of buffer */
417 /* But if that overlaps with the old tree... */
418 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
419 /* Try right after the old tree instead */
420 tmp = (char *)(uintptr_t)fdtend;
421 if ((tmp + newsize) > ((char *)buf + bufsize))
422 return -FDT_ERR_NOSPACE;
425 _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size);
426 memmove(buf, tmp, newsize);
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));
437 int fdt_pack(void *fdt)
441 FDT_RW_CHECK_HEADER(fdt);
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));
451 int fdt_remove_unused_strings(const void *old, void *new)
453 const struct fdt_property *old_prop;
454 struct fdt_property *new_prop;
455 int size = fdt_totalsize(old);
456 int next_offset, offset;
461 /* Make a copy and remove the strings */
462 memcpy(new, old, size);
463 fdt_set_size_dt_strings(new, 0);
465 /* Add every property name back into the new string table */
466 for (offset = 0; tag != FDT_END; offset = next_offset) {
467 tag = fdt_next_tag(old, offset, &next_offset);
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);
477 new_prop->nameoff = cpu_to_fdt32(ret);