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);
246 memcpy(prop->data, val, len);
250 int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
251 const void *val, int len)
253 struct fdt_property *prop;
254 int err, oldlen, newlen;
256 FDT_RW_CHECK_HEADER(fdt);
258 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
260 newlen = len + oldlen;
261 err = _fdt_splice_struct(fdt, prop->data,
262 FDT_TAGALIGN(oldlen),
263 FDT_TAGALIGN(newlen));
266 prop->len = cpu_to_fdt32(newlen);
267 memcpy(prop->data + oldlen, val, len);
269 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
272 memcpy(prop->data, val, len);
277 int fdt_delprop(void *fdt, int nodeoffset, const char *name)
279 struct fdt_property *prop;
282 FDT_RW_CHECK_HEADER(fdt);
284 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
288 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
289 return _fdt_splice_struct(fdt, prop, proplen, 0);
292 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
293 const char *name, int namelen)
295 struct fdt_node_header *nh;
296 int offset, nextoffset;
302 FDT_RW_CHECK_HEADER(fdt);
304 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
306 return -FDT_ERR_EXISTS;
307 else if (offset != -FDT_ERR_NOTFOUND)
310 /* Try to place the new node after the parent's properties */
311 fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
314 tag = fdt_next_tag(fdt, offset, &nextoffset);
315 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
317 nh = _fdt_offset_ptr_w(fdt, offset);
318 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
320 err = _fdt_splice_struct(fdt, nh, 0, nodelen);
324 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
325 memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
326 memcpy(nh->name, name, namelen);
327 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
328 *endtag = cpu_to_fdt32(FDT_END_NODE);
333 int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
335 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
338 int fdt_del_node(void *fdt, int nodeoffset)
342 FDT_RW_CHECK_HEADER(fdt);
344 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
348 return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
349 endoffset - nodeoffset, 0);
352 static void _fdt_packblocks(const char *old, char *new,
353 int mem_rsv_size, int struct_size)
355 int mem_rsv_off, struct_off, strings_off;
357 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
358 struct_off = mem_rsv_off + mem_rsv_size;
359 strings_off = struct_off + struct_size;
361 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
362 fdt_set_off_mem_rsvmap(new, mem_rsv_off);
364 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
365 fdt_set_off_dt_struct(new, struct_off);
366 fdt_set_size_dt_struct(new, struct_size);
368 memmove(new + strings_off, old + fdt_off_dt_strings(old),
369 fdt_size_dt_strings(old));
370 fdt_set_off_dt_strings(new, strings_off);
371 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
374 int fdt_open_into(const void *fdt, void *buf, int bufsize)
377 int mem_rsv_size, struct_size;
379 const char *fdtstart = fdt;
380 const char *fdtend = fdtstart + fdt_totalsize(fdt);
383 FDT_CHECK_HEADER(fdt);
385 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
386 * sizeof(struct fdt_reserve_entry);
388 if (fdt_version(fdt) >= 17) {
389 struct_size = fdt_size_dt_struct(fdt);
392 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
398 if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
399 /* no further work necessary */
400 err = fdt_move(fdt, buf, bufsize);
403 fdt_set_version(buf, 17);
404 fdt_set_size_dt_struct(buf, struct_size);
405 fdt_set_totalsize(buf, bufsize);
409 /* Need to reorder */
410 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
411 + struct_size + fdt_size_dt_strings(fdt);
413 if (bufsize < newsize)
414 return -FDT_ERR_NOSPACE;
416 /* First attempt to build converted tree at beginning of buffer */
418 /* But if that overlaps with the old tree... */
419 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
420 /* Try right after the old tree instead */
421 tmp = (char *)(uintptr_t)fdtend;
422 if ((tmp + newsize) > ((char *)buf + bufsize))
423 return -FDT_ERR_NOSPACE;
426 _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size);
427 memmove(buf, tmp, newsize);
429 fdt_set_magic(buf, FDT_MAGIC);
430 fdt_set_totalsize(buf, bufsize);
431 fdt_set_version(buf, 17);
432 fdt_set_last_comp_version(buf, 16);
433 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
438 int fdt_pack(void *fdt)
442 FDT_RW_CHECK_HEADER(fdt);
444 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
445 * sizeof(struct fdt_reserve_entry);
446 _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
447 fdt_set_totalsize(fdt, _fdt_data_size(fdt));
452 int fdt_remove_unused_strings(const void *old, void *new)
454 const struct fdt_property *old_prop;
455 struct fdt_property *new_prop;
456 int size = fdt_totalsize(old);
457 int next_offset, offset;
462 /* Make a copy and remove the strings */
463 memcpy(new, old, size);
464 fdt_set_size_dt_strings(new, 0);
466 /* Add every property name back into the new string table */
467 for (offset = 0; tag != FDT_END; offset = next_offset) {
468 tag = fdt_next_tag(old, offset, &next_offset);
471 old_prop = fdt_get_property_by_offset(old, offset, NULL);
472 new_prop = (struct fdt_property *)(unsigned long)
473 fdt_get_property_by_offset(new, offset, NULL);
474 str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff));
475 ret = _fdt_find_add_string(new, str);
478 new_prop->nameoff = cpu_to_fdt32(ret);