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git.ipfire.org Git - people/ms/u-boot.git/blob - lib/libfdt/fdt_rw.c
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
);