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"
56 #include "libfdt_internal.h"
58 static int _blocks_misordered(const void *fdt,
59 int mem_rsv_size, int struct_size)
61 return (fdt_off_mem_rsvmap(fdt) < ALIGN(sizeof(struct fdt_header), 8))
62 || (fdt_off_dt_struct(fdt) <
63 (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
64 || (fdt_off_dt_strings(fdt) <
65 (fdt_off_dt_struct(fdt) + struct_size))
66 || (fdt_totalsize(fdt) <
67 (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
70 static int rw_check_header(void *fdt)
74 if ((err = fdt_check_header(fdt)))
76 if (fdt_version(fdt) < 17)
77 return -FDT_ERR_BADVERSION;
78 if (_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry),
79 fdt_size_dt_struct(fdt)))
80 return -FDT_ERR_BADLAYOUT;
81 if (fdt_version(fdt) > 17)
82 fdt_set_version(fdt, 17);
87 #define RW_CHECK_HEADER(fdt) \
90 if ((err = rw_check_header(fdt)) != 0) \
94 static inline int _blob_data_size(void *fdt)
96 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
99 static int _blob_splice(void *fdt, void *p, int oldlen, int newlen)
101 void *end = fdt + _blob_data_size(fdt);
103 if (((p + oldlen) < p) || ((p + oldlen) > end))
104 return -FDT_ERR_BADOFFSET;
105 if ((end - oldlen + newlen) > (fdt + fdt_totalsize(fdt)))
106 return -FDT_ERR_NOSPACE;
107 memmove(p + newlen, p + oldlen, end - p - oldlen);
111 static int _blob_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
114 int delta = (newn - oldn) * sizeof(*p);
116 err = _blob_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
119 fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
120 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
124 static int _blob_splice_struct(void *fdt, void *p,
125 int oldlen, int newlen)
127 int delta = newlen - oldlen;
130 if ((err = _blob_splice(fdt, p, oldlen, newlen)))
133 fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
134 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
138 static int _blob_splice_string(void *fdt, int newlen)
140 void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
143 if ((err = _blob_splice(fdt, p, 0, newlen)))
146 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
150 static int _find_add_string(void *fdt, const char *s)
152 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
155 int len = strlen(s) + 1;
158 p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
163 new = strtab + fdt_size_dt_strings(fdt);
164 err = _blob_splice_string(fdt, len);
169 return (new - strtab);
172 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
174 struct fdt_reserve_entry *re;
177 if ((err = rw_check_header(fdt)))
180 re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
181 err = _blob_splice_mem_rsv(fdt, re, 0, 1);
185 re->address = cpu_to_fdt64(address);
186 re->size = cpu_to_fdt64(size);
190 int fdt_del_mem_rsv(void *fdt, int n)
192 struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
195 if ((err = rw_check_header(fdt)))
197 if (n >= fdt_num_mem_rsv(fdt))
198 return -FDT_ERR_NOTFOUND;
200 err = _blob_splice_mem_rsv(fdt, re, 1, 0);
206 static int _resize_property(void *fdt, int nodeoffset, const char *name, int len,
207 struct fdt_property **prop)
212 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
216 if ((err = _blob_splice_struct(fdt, (*prop)->data,
217 ALIGN(oldlen, FDT_TAGSIZE),
218 ALIGN(len, FDT_TAGSIZE))))
221 (*prop)->len = cpu_to_fdt32(len);
225 static int _add_property(void *fdt, int nodeoffset, const char *name, int len,
226 struct fdt_property **prop)
234 tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
235 if (tag != FDT_BEGIN_NODE)
236 return -FDT_ERR_BADOFFSET;
238 namestroff = _find_add_string(fdt, name);
242 *prop = _fdt_offset_ptr_w(fdt, nextoffset);
243 proplen = sizeof(**prop) + ALIGN(len, FDT_TAGSIZE);
245 err = _blob_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_setprop(void *fdt, int nodeoffset, const char *name,
256 const void *val, int len)
258 struct fdt_property *prop;
261 if ((err = rw_check_header(fdt)))
264 err = _resize_property(fdt, nodeoffset, name, len, &prop);
265 if (err == -FDT_ERR_NOTFOUND)
266 err = _add_property(fdt, nodeoffset, name, len, &prop);
270 memcpy(prop->data, val, len);
274 int fdt_delprop(void *fdt, int nodeoffset, const char *name)
276 struct fdt_property *prop;
279 RW_CHECK_HEADER(fdt);
281 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
285 proplen = sizeof(*prop) + ALIGN(len, FDT_TAGSIZE);
286 return _blob_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 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);
314 nh = _fdt_offset_ptr_w(fdt, offset);
315 nodelen = sizeof(*nh) + ALIGN(namelen+1, FDT_TAGSIZE) + FDT_TAGSIZE;
317 err = _blob_splice_struct(fdt, nh, 0, nodelen);
321 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
322 memset(nh->name, 0, ALIGN(namelen+1, FDT_TAGSIZE));
323 memcpy(nh->name, name, namelen);
324 endtag = (uint32_t *)((void *)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 RW_CHECK_HEADER(fdt);
341 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
345 return _blob_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
346 endoffset - nodeoffset, 0);
349 static void _packblocks(const void *fdt, void *buf,
350 int mem_rsv_size, int struct_size)
352 int mem_rsv_off, struct_off, strings_off;
354 mem_rsv_off = ALIGN(sizeof(struct fdt_header), 8);
355 struct_off = mem_rsv_off + mem_rsv_size;
356 strings_off = struct_off + struct_size;
358 memmove(buf + mem_rsv_off, fdt + fdt_off_mem_rsvmap(fdt), mem_rsv_size);
359 fdt_set_off_mem_rsvmap(buf, mem_rsv_off);
361 memmove(buf + struct_off, fdt + fdt_off_dt_struct(fdt), struct_size);
362 fdt_set_off_dt_struct(buf, struct_off);
363 fdt_set_size_dt_struct(buf, struct_size);
365 memmove(buf + strings_off, fdt + fdt_off_dt_strings(fdt),
366 fdt_size_dt_strings(fdt));
367 fdt_set_off_dt_strings(buf, strings_off);
368 fdt_set_size_dt_strings(buf, fdt_size_dt_strings(fdt));
371 int fdt_open_into(const void *fdt, void *buf, int bufsize)
374 int mem_rsv_size, struct_size;
378 err = 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)
393 if (!_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
394 /* no further work necessary */
395 err = fdt_move(fdt, buf, bufsize);
398 fdt_set_version(buf, 17);
399 fdt_set_size_dt_struct(buf, struct_size);
400 fdt_set_totalsize(buf, bufsize);
404 /* Need to reorder */
405 newsize = ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
406 + struct_size + fdt_size_dt_strings(fdt);
408 if (bufsize < newsize)
409 return -FDT_ERR_NOSPACE;
411 if (((buf + newsize) <= fdt)
412 || (buf >= (fdt + fdt_totalsize(fdt)))) {
415 tmp = (void *)fdt + fdt_totalsize(fdt);
416 if ((tmp + newsize) > (buf + bufsize))
417 return -FDT_ERR_NOSPACE;
420 _packblocks(fdt, tmp, mem_rsv_size, struct_size);
421 memmove(buf, tmp, newsize);
423 fdt_set_magic(buf, FDT_MAGIC);
424 fdt_set_totalsize(buf, bufsize);
425 fdt_set_version(buf, 17);
426 fdt_set_last_comp_version(buf, 16);
427 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
432 int fdt_pack(void *fdt)
437 err = rw_check_header(fdt);
441 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
442 * sizeof(struct fdt_reserve_entry);
443 _packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
444 fdt_set_totalsize(fdt, _blob_data_size(fdt));