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git.ipfire.org Git - people/ms/u-boot.git/blob - libfdt/fdt_rw.c
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
5 * libfdt is dual licensed: you can use it either under the terms of
6 * the GPL, or the BSD license, at your option.
8 * a) This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public
19 * License along with this library; if not, write to the Free
20 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
25 * b) Redistribution and use in source and binary forms, with or
26 * without modification, are permitted provided that the following
29 * 1. Redistributions of source code must retain the above
30 * copyright notice, this list of conditions and the following
32 * 2. Redistributions in binary form must reproduce the above
33 * copyright notice, this list of conditions and the following
34 * disclaimer in the documentation and/or other materials
35 * provided with the distribution.
37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
38 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
39 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
42 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
49 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
51 #include "libfdt_env.h"
60 #include "libfdt_internal.h"
62 static int _fdt_blocks_misordered(const void *fdt
,
63 int mem_rsv_size
, int struct_size
)
65 return (fdt_off_mem_rsvmap(fdt
) < FDT_ALIGN(sizeof(struct fdt_header
), 8))
66 || (fdt_off_dt_struct(fdt
) <
67 (fdt_off_mem_rsvmap(fdt
) + mem_rsv_size
))
68 || (fdt_off_dt_strings(fdt
) <
69 (fdt_off_dt_struct(fdt
) + struct_size
))
70 || (fdt_totalsize(fdt
) <
71 (fdt_off_dt_strings(fdt
) + fdt_size_dt_strings(fdt
)));
74 static int _fdt_rw_check_header(void *fdt
)
76 FDT_CHECK_HEADER(fdt
);
78 if (fdt_version(fdt
) < 17)
79 return -FDT_ERR_BADVERSION
;
80 if (_fdt_blocks_misordered(fdt
, sizeof(struct fdt_reserve_entry
),
81 fdt_size_dt_struct(fdt
)))
82 return -FDT_ERR_BADLAYOUT
;
83 if (fdt_version(fdt
) > 17)
84 fdt_set_version(fdt
, 17);
89 #define FDT_RW_CHECK_HEADER(fdt) \
92 if ((err = _fdt_rw_check_header(fdt)) != 0) \
96 static inline int _fdt_data_size(void *fdt
)
98 return fdt_off_dt_strings(fdt
) + fdt_size_dt_strings(fdt
);
101 static int _fdt_splice(void *fdt
, void *splicepoint
, int oldlen
, int newlen
)
103 char *p
= splicepoint
;
104 char *end
= (char *)fdt
+ _fdt_data_size(fdt
);
106 if (((p
+ oldlen
) < p
) || ((p
+ oldlen
) > end
))
107 return -FDT_ERR_BADOFFSET
;
108 if ((end
- oldlen
+ newlen
) > ((char *)fdt
+ fdt_totalsize(fdt
)))
109 return -FDT_ERR_NOSPACE
;
110 memmove(p
+ newlen
, p
+ oldlen
, end
- p
- oldlen
);
114 static int _fdt_splice_mem_rsv(void *fdt
, struct fdt_reserve_entry
*p
,
117 int delta
= (newn
- oldn
) * sizeof(*p
);
119 err
= _fdt_splice(fdt
, p
, oldn
* sizeof(*p
), newn
* sizeof(*p
));
122 fdt_set_off_dt_struct(fdt
, fdt_off_dt_struct(fdt
) + delta
);
123 fdt_set_off_dt_strings(fdt
, fdt_off_dt_strings(fdt
) + delta
);
127 static int _fdt_splice_struct(void *fdt
, void *p
,
128 int oldlen
, int newlen
)
130 int delta
= newlen
- oldlen
;
133 if ((err
= _fdt_splice(fdt
, p
, oldlen
, newlen
)))
136 fdt_set_size_dt_struct(fdt
, fdt_size_dt_struct(fdt
) + delta
);
137 fdt_set_off_dt_strings(fdt
, fdt_off_dt_strings(fdt
) + delta
);
141 static int _fdt_splice_string(void *fdt
, int newlen
)
143 void *p
= (char *)fdt
144 + fdt_off_dt_strings(fdt
) + fdt_size_dt_strings(fdt
);
147 if ((err
= _fdt_splice(fdt
, p
, 0, newlen
)))
150 fdt_set_size_dt_strings(fdt
, fdt_size_dt_strings(fdt
) + newlen
);
154 static int _fdt_find_add_string(void *fdt
, const char *s
)
156 char *strtab
= (char *)fdt
+ fdt_off_dt_strings(fdt
);
159 int len
= strlen(s
) + 1;
162 p
= _fdt_find_string(strtab
, fdt_size_dt_strings(fdt
), s
);
167 new = strtab
+ fdt_size_dt_strings(fdt
);
168 err
= _fdt_splice_string(fdt
, len
);
173 return (new - strtab
);
176 int fdt_add_mem_rsv(void *fdt
, uint64_t address
, uint64_t size
)
178 struct fdt_reserve_entry
*re
;
181 FDT_RW_CHECK_HEADER(fdt
);
183 re
= _fdt_mem_rsv_w(fdt
, fdt_num_mem_rsv(fdt
));
184 err
= _fdt_splice_mem_rsv(fdt
, re
, 0, 1);
188 re
->address
= cpu_to_fdt64(address
);
189 re
->size
= cpu_to_fdt64(size
);
193 int fdt_del_mem_rsv(void *fdt
, int n
)
195 struct fdt_reserve_entry
*re
= _fdt_mem_rsv_w(fdt
, n
);
198 FDT_RW_CHECK_HEADER(fdt
);
200 if (n
>= fdt_num_mem_rsv(fdt
))
201 return -FDT_ERR_NOTFOUND
;
203 err
= _fdt_splice_mem_rsv(fdt
, re
, 1, 0);
209 static int _fdt_resize_property(void *fdt
, int nodeoffset
, const char *name
,
210 int len
, struct fdt_property
**prop
)
215 *prop
= fdt_get_property_w(fdt
, nodeoffset
, name
, &oldlen
);
219 if ((err
= _fdt_splice_struct(fdt
, (*prop
)->data
, FDT_TAGALIGN(oldlen
),
223 (*prop
)->len
= cpu_to_fdt32(len
);
227 static int _fdt_add_property(void *fdt
, int nodeoffset
, const char *name
,
228 int len
, struct fdt_property
**prop
)
235 if ((nextoffset
= _fdt_check_node_offset(fdt
, nodeoffset
)) < 0)
238 namestroff
= _fdt_find_add_string(fdt
, name
);
242 *prop
= _fdt_offset_ptr_w(fdt
, nextoffset
);
243 proplen
= sizeof(**prop
) + FDT_TAGALIGN(len
);
245 err
= _fdt_splice_struct(fdt
, *prop
, 0, proplen
);
249 (*prop
)->tag
= cpu_to_fdt32(FDT_PROP
);
250 (*prop
)->nameoff
= cpu_to_fdt32(namestroff
);
251 (*prop
)->len
= cpu_to_fdt32(len
);
255 int fdt_set_name(void *fdt
, int nodeoffset
, const char *name
)
261 FDT_RW_CHECK_HEADER(fdt
);
263 namep
= (char *)(uintptr_t)fdt_get_name(fdt
, nodeoffset
, &oldlen
);
267 newlen
= strlen(name
);
269 err
= _fdt_splice_struct(fdt
, namep
, FDT_TAGALIGN(oldlen
+1),
270 FDT_TAGALIGN(newlen
+1));
274 memcpy(namep
, name
, newlen
+1);
278 int fdt_setprop(void *fdt
, int nodeoffset
, const char *name
,
279 const void *val
, int len
)
281 struct fdt_property
*prop
;
284 FDT_RW_CHECK_HEADER(fdt
);
286 err
= _fdt_resize_property(fdt
, nodeoffset
, name
, len
, &prop
);
287 if (err
== -FDT_ERR_NOTFOUND
)
288 err
= _fdt_add_property(fdt
, nodeoffset
, name
, len
, &prop
);
292 memcpy(prop
->data
, val
, len
);
296 int fdt_delprop(void *fdt
, int nodeoffset
, const char *name
)
298 struct fdt_property
*prop
;
301 FDT_RW_CHECK_HEADER(fdt
);
303 prop
= fdt_get_property_w(fdt
, nodeoffset
, name
, &len
);
307 proplen
= sizeof(*prop
) + FDT_TAGALIGN(len
);
308 return _fdt_splice_struct(fdt
, prop
, proplen
, 0);
311 int fdt_add_subnode_namelen(void *fdt
, int parentoffset
,
312 const char *name
, int namelen
)
314 struct fdt_node_header
*nh
;
315 int offset
, nextoffset
;
321 FDT_RW_CHECK_HEADER(fdt
);
323 offset
= fdt_subnode_offset_namelen(fdt
, parentoffset
, name
, namelen
);
325 return -FDT_ERR_EXISTS
;
326 else if (offset
!= -FDT_ERR_NOTFOUND
)
329 /* Try to place the new node after the parent's properties */
330 fdt_next_tag(fdt
, parentoffset
, &nextoffset
); /* skip the BEGIN_NODE */
333 tag
= fdt_next_tag(fdt
, offset
, &nextoffset
);
334 } while ((tag
== FDT_PROP
) || (tag
== FDT_NOP
));
336 nh
= _fdt_offset_ptr_w(fdt
, offset
);
337 nodelen
= sizeof(*nh
) + FDT_TAGALIGN(namelen
+1) + FDT_TAGSIZE
;
339 err
= _fdt_splice_struct(fdt
, nh
, 0, nodelen
);
343 nh
->tag
= cpu_to_fdt32(FDT_BEGIN_NODE
);
344 memset(nh
->name
, 0, FDT_TAGALIGN(namelen
+1));
345 memcpy(nh
->name
, name
, namelen
);
346 endtag
= (uint32_t *)((char *)nh
+ nodelen
- FDT_TAGSIZE
);
347 *endtag
= cpu_to_fdt32(FDT_END_NODE
);
352 int fdt_add_subnode(void *fdt
, int parentoffset
, const char *name
)
354 return fdt_add_subnode_namelen(fdt
, parentoffset
, name
, strlen(name
));
357 int fdt_del_node(void *fdt
, int nodeoffset
)
361 FDT_RW_CHECK_HEADER(fdt
);
363 endoffset
= _fdt_node_end_offset(fdt
, nodeoffset
);
367 return _fdt_splice_struct(fdt
, _fdt_offset_ptr_w(fdt
, nodeoffset
),
368 endoffset
- nodeoffset
, 0);
371 static void _fdt_packblocks(const char *old
, char *new,
372 int mem_rsv_size
, int struct_size
)
374 int mem_rsv_off
, struct_off
, strings_off
;
376 mem_rsv_off
= FDT_ALIGN(sizeof(struct fdt_header
), 8);
377 struct_off
= mem_rsv_off
+ mem_rsv_size
;
378 strings_off
= struct_off
+ struct_size
;
380 memmove(new + mem_rsv_off
, old
+ fdt_off_mem_rsvmap(old
), mem_rsv_size
);
381 fdt_set_off_mem_rsvmap(new, mem_rsv_off
);
383 memmove(new + struct_off
, old
+ fdt_off_dt_struct(old
), struct_size
);
384 fdt_set_off_dt_struct(new, struct_off
);
385 fdt_set_size_dt_struct(new, struct_size
);
387 memmove(new + strings_off
, old
+ fdt_off_dt_strings(old
),
388 fdt_size_dt_strings(old
));
389 fdt_set_off_dt_strings(new, strings_off
);
390 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old
));
393 int fdt_open_into(const void *fdt
, void *buf
, int bufsize
)
396 int mem_rsv_size
, struct_size
;
398 const char *fdtstart
= fdt
;
399 const char *fdtend
= fdtstart
+ fdt_totalsize(fdt
);
402 FDT_CHECK_HEADER(fdt
);
404 mem_rsv_size
= (fdt_num_mem_rsv(fdt
)+1)
405 * sizeof(struct fdt_reserve_entry
);
407 if (fdt_version(fdt
) >= 17) {
408 struct_size
= fdt_size_dt_struct(fdt
);
411 while (fdt_next_tag(fdt
, struct_size
, &struct_size
) != FDT_END
)
417 if (!_fdt_blocks_misordered(fdt
, mem_rsv_size
, struct_size
)) {
418 /* no further work necessary */
419 err
= fdt_move(fdt
, buf
, bufsize
);
422 fdt_set_version(buf
, 17);
423 fdt_set_size_dt_struct(buf
, struct_size
);
424 fdt_set_totalsize(buf
, bufsize
);
428 /* Need to reorder */
429 newsize
= FDT_ALIGN(sizeof(struct fdt_header
), 8) + mem_rsv_size
430 + struct_size
+ fdt_size_dt_strings(fdt
);
432 if (bufsize
< newsize
)
433 return -FDT_ERR_NOSPACE
;
435 /* First attempt to build converted tree at beginning of buffer */
437 /* But if that overlaps with the old tree... */
438 if (((tmp
+ newsize
) > fdtstart
) && (tmp
< fdtend
)) {
439 /* Try right after the old tree instead */
440 tmp
= (char *)(uintptr_t)fdtend
;
441 if ((tmp
+ newsize
) > ((char *)buf
+ bufsize
))
442 return -FDT_ERR_NOSPACE
;
445 _fdt_packblocks(fdt
, tmp
, mem_rsv_size
, struct_size
);
446 memmove(buf
, tmp
, newsize
);
448 fdt_set_magic(buf
, FDT_MAGIC
);
449 fdt_set_totalsize(buf
, bufsize
);
450 fdt_set_version(buf
, 17);
451 fdt_set_last_comp_version(buf
, 16);
452 fdt_set_boot_cpuid_phys(buf
, fdt_boot_cpuid_phys(fdt
));
457 int fdt_pack(void *fdt
)
461 FDT_RW_CHECK_HEADER(fdt
);
463 mem_rsv_size
= (fdt_num_mem_rsv(fdt
)+1)
464 * sizeof(struct fdt_reserve_entry
);
465 _fdt_packblocks(fdt
, fdt
, mem_rsv_size
, fdt_size_dt_struct(fdt
));
466 fdt_set_totalsize(fdt
, _fdt_data_size(fdt
));