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Gerald Van Baren35748172007-03-31 12:00:56 -04001/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
4 *
Kumar Gala8d04f022007-10-24 11:04:22 -05005 * libfdt is dual licensed: you can use it either under the terms of
6 * the GPL, or the BSD license, at your option.
Gerald Van Baren35748172007-03-31 12:00:56 -04007 *
Kumar Gala8d04f022007-10-24 11:04:22 -05008 * 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.
Gerald Van Baren35748172007-03-31 12:00:56 -040012 *
Kumar Gala8d04f022007-10-24 11:04:22 -050013 * 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.
17 *
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,
21 * MA 02110-1301 USA
22 *
23 * Alternatively,
24 *
25 * b) Redistribution and use in source and binary forms, with or
26 * without modification, are permitted provided that the following
27 * conditions are met:
28 *
29 * 1. Redistributions of source code must retain the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer.
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.
36 *
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.
Gerald Van Baren35748172007-03-31 12:00:56 -040050 */
51#include "libfdt_env.h"
52
53#include <fdt.h>
54#include <libfdt.h>
55
56#include "libfdt_internal.h"
57
Kumar Gala8d04f022007-10-24 11:04:22 -050058static int _blocks_misordered(const void *fdt,
59 int mem_rsv_size, int struct_size)
60{
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)));
68}
69
Gerald Van Baren35748172007-03-31 12:00:56 -040070static int rw_check_header(void *fdt)
71{
72 int err;
73
Gerald Van Baren6679f922007-04-06 14:17:14 -040074 if ((err = fdt_check_header(fdt)))
Gerald Van Baren35748172007-03-31 12:00:56 -040075 return err;
Kumar Gala8d04f022007-10-24 11:04:22 -050076 if (fdt_version(fdt) < 17)
Gerald Van Baren35748172007-03-31 12:00:56 -040077 return -FDT_ERR_BADVERSION;
Kumar Gala8d04f022007-10-24 11:04:22 -050078 if (_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry),
79 fdt_size_dt_struct(fdt)))
Gerald Van Baren35748172007-03-31 12:00:56 -040080 return -FDT_ERR_BADLAYOUT;
Kumar Gala8d04f022007-10-24 11:04:22 -050081 if (fdt_version(fdt) > 17)
82 fdt_set_version(fdt, 17);
83
Gerald Van Baren35748172007-03-31 12:00:56 -040084 return 0;
85}
86
87#define RW_CHECK_HEADER(fdt) \
88 { \
89 int err; \
90 if ((err = rw_check_header(fdt)) != 0) \
91 return err; \
92 }
93
94static inline int _blob_data_size(void *fdt)
95{
96 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
97}
98
99static int _blob_splice(void *fdt, void *p, int oldlen, int newlen)
100{
101 void *end = fdt + _blob_data_size(fdt);
102
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);
108 return 0;
109}
110
Kumar Gala8d04f022007-10-24 11:04:22 -0500111static int _blob_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
112 int oldn, int newn)
113{
114 int delta = (newn - oldn) * sizeof(*p);
115 int err;
116 err = _blob_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
117 if (err)
118 return err;
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);
121 return 0;
122}
123
Gerald Van Baren35748172007-03-31 12:00:56 -0400124static int _blob_splice_struct(void *fdt, void *p,
125 int oldlen, int newlen)
126{
127 int delta = newlen - oldlen;
128 int err;
129
130 if ((err = _blob_splice(fdt, p, oldlen, newlen)))
131 return err;
132
Kumar Gala8d04f022007-10-24 11:04:22 -0500133 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);
Gerald Van Baren35748172007-03-31 12:00:56 -0400135 return 0;
136}
137
138static int _blob_splice_string(void *fdt, int newlen)
139{
140 void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
141 int err;
142
143 if ((err = _blob_splice(fdt, p, 0, newlen)))
144 return err;
145
Kumar Gala8d04f022007-10-24 11:04:22 -0500146 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
Gerald Van Baren35748172007-03-31 12:00:56 -0400147 return 0;
148}
149
150static int _find_add_string(void *fdt, const char *s)
151{
152 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
153 const char *p;
154 char *new;
155 int len = strlen(s) + 1;
156 int err;
157
158 p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
159 if (p)
160 /* found it */
161 return (p - strtab);
162
163 new = strtab + fdt_size_dt_strings(fdt);
164 err = _blob_splice_string(fdt, len);
165 if (err)
166 return err;
167
168 memcpy(new, s, len);
169 return (new - strtab);
170}
171
Kumar Gala8d04f022007-10-24 11:04:22 -0500172int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
173{
174 struct fdt_reserve_entry *re;
175 int err;
176
177 if ((err = rw_check_header(fdt)))
178 return err;
179
180 re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
181 err = _blob_splice_mem_rsv(fdt, re, 0, 1);
182 if (err)
183 return err;
184
185 re->address = cpu_to_fdt64(address);
186 re->size = cpu_to_fdt64(size);
187 return 0;
188}
189
190int fdt_del_mem_rsv(void *fdt, int n)
191{
192 struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
193 int err;
194
195 if ((err = rw_check_header(fdt)))
196 return err;
197 if (n >= fdt_num_mem_rsv(fdt))
198 return -FDT_ERR_NOTFOUND;
199
200 err = _blob_splice_mem_rsv(fdt, re, 1, 0);
201 if (err)
202 return err;
203 return 0;
204}
205
Gerald Van Baren35748172007-03-31 12:00:56 -0400206static int _resize_property(void *fdt, int nodeoffset, const char *name, int len,
207 struct fdt_property **prop)
208{
209 int oldlen;
210 int err;
211
Kumar Gala8d04f022007-10-24 11:04:22 -0500212 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
Gerald Van Baren35748172007-03-31 12:00:56 -0400213 if (! (*prop))
214 return oldlen;
215
216 if ((err = _blob_splice_struct(fdt, (*prop)->data,
217 ALIGN(oldlen, FDT_TAGSIZE),
218 ALIGN(len, FDT_TAGSIZE))))
219 return err;
220
221 (*prop)->len = cpu_to_fdt32(len);
222 return 0;
223}
224
225static int _add_property(void *fdt, int nodeoffset, const char *name, int len,
226 struct fdt_property **prop)
227{
228 uint32_t tag;
229 int proplen;
230 int nextoffset;
231 int namestroff;
232 int err;
233
Kumar Gala8d04f022007-10-24 11:04:22 -0500234 tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
Gerald Van Baren35748172007-03-31 12:00:56 -0400235 if (tag != FDT_BEGIN_NODE)
236 return -FDT_ERR_BADOFFSET;
237
238 namestroff = _find_add_string(fdt, name);
239 if (namestroff < 0)
240 return namestroff;
241
Kumar Gala8d04f022007-10-24 11:04:22 -0500242 *prop = _fdt_offset_ptr_w(fdt, nextoffset);
Gerald Van Baren35748172007-03-31 12:00:56 -0400243 proplen = sizeof(**prop) + ALIGN(len, FDT_TAGSIZE);
244
245 err = _blob_splice_struct(fdt, *prop, 0, proplen);
246 if (err)
247 return err;
248
249 (*prop)->tag = cpu_to_fdt32(FDT_PROP);
250 (*prop)->nameoff = cpu_to_fdt32(namestroff);
251 (*prop)->len = cpu_to_fdt32(len);
252 return 0;
253}
254
255int fdt_setprop(void *fdt, int nodeoffset, const char *name,
256 const void *val, int len)
257{
258 struct fdt_property *prop;
259 int err;
260
261 if ((err = rw_check_header(fdt)))
262 return err;
263
264 err = _resize_property(fdt, nodeoffset, name, len, &prop);
265 if (err == -FDT_ERR_NOTFOUND)
266 err = _add_property(fdt, nodeoffset, name, len, &prop);
267 if (err)
268 return err;
269
270 memcpy(prop->data, val, len);
271 return 0;
272}
273
274int fdt_delprop(void *fdt, int nodeoffset, const char *name)
275{
276 struct fdt_property *prop;
277 int len, proplen;
278
279 RW_CHECK_HEADER(fdt);
280
Kumar Gala8d04f022007-10-24 11:04:22 -0500281 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
Gerald Van Baren35748172007-03-31 12:00:56 -0400282 if (! prop)
283 return len;
284
285 proplen = sizeof(*prop) + ALIGN(len, FDT_TAGSIZE);
286 return _blob_splice_struct(fdt, prop, proplen, 0);
287}
288
289int fdt_add_subnode_namelen(void *fdt, int parentoffset,
290 const char *name, int namelen)
291{
292 struct fdt_node_header *nh;
293 int offset, nextoffset;
294 int nodelen;
295 int err;
296 uint32_t tag;
297 uint32_t *endtag;
298
299 RW_CHECK_HEADER(fdt);
300
301 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
302 if (offset >= 0)
303 return -FDT_ERR_EXISTS;
304 else if (offset != -FDT_ERR_NOTFOUND)
305 return offset;
306
307 /* Try to place the new node after the parent's properties */
Kumar Gala8d04f022007-10-24 11:04:22 -0500308 fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
Gerald Van Baren35748172007-03-31 12:00:56 -0400309 do {
310 offset = nextoffset;
Kumar Gala8d04f022007-10-24 11:04:22 -0500311 tag = fdt_next_tag(fdt, offset, &nextoffset);
Gerald Van Baren35748172007-03-31 12:00:56 -0400312 } while (tag == FDT_PROP);
313
Kumar Gala8d04f022007-10-24 11:04:22 -0500314 nh = _fdt_offset_ptr_w(fdt, offset);
Gerald Van Baren35748172007-03-31 12:00:56 -0400315 nodelen = sizeof(*nh) + ALIGN(namelen+1, FDT_TAGSIZE) + FDT_TAGSIZE;
316
317 err = _blob_splice_struct(fdt, nh, 0, nodelen);
318 if (err)
319 return err;
320
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);
326
327 return offset;
328}
329
330int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
331{
332 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
333}
334
335int fdt_del_node(void *fdt, int nodeoffset)
336{
337 int endoffset;
338
Kumar Gala8d04f022007-10-24 11:04:22 -0500339 RW_CHECK_HEADER(fdt);
340
Gerald Van Baren35748172007-03-31 12:00:56 -0400341 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
342 if (endoffset < 0)
343 return endoffset;
344
Kumar Gala8d04f022007-10-24 11:04:22 -0500345 return _blob_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
Gerald Van Baren35748172007-03-31 12:00:56 -0400346 endoffset - nodeoffset, 0);
347}
348
Kumar Gala8d04f022007-10-24 11:04:22 -0500349static void _packblocks(const void *fdt, void *buf,
350 int mem_rsv_size, int struct_size)
351{
352 int mem_rsv_off, struct_off, strings_off;
353
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;
357
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);
360
361 memcpy(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);
364
365 memcpy(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));
369}
370
371int fdt_open_into(const void *fdt, void *buf, int bufsize)
Gerald Van Baren35748172007-03-31 12:00:56 -0400372{
373 int err;
Kumar Gala8d04f022007-10-24 11:04:22 -0500374 int mem_rsv_size, struct_size;
375 int newsize;
376 void *tmp;
Gerald Van Baren35748172007-03-31 12:00:56 -0400377
Kumar Gala8d04f022007-10-24 11:04:22 -0500378 err = fdt_check_header(fdt);
Gerald Van Baren35748172007-03-31 12:00:56 -0400379 if (err)
380 return err;
381
Kumar Gala8d04f022007-10-24 11:04:22 -0500382 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
383 * sizeof(struct fdt_reserve_entry);
Gerald Van Baren35748172007-03-31 12:00:56 -0400384
Kumar Gala8d04f022007-10-24 11:04:22 -0500385 if (fdt_version(fdt) >= 17) {
386 struct_size = fdt_size_dt_struct(fdt);
387 } else {
388 struct_size = 0;
389 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
390 ;
391 }
Gerald Van Baren35748172007-03-31 12:00:56 -0400392
Kumar Gala8d04f022007-10-24 11:04:22 -0500393 if (!_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
394 /* no further work necessary */
395 err = fdt_move(fdt, buf, bufsize);
396 if (err)
397 return err;
398 fdt_set_version(buf, 17);
399 fdt_set_size_dt_struct(buf, struct_size);
400 fdt_set_totalsize(buf, bufsize);
401 return 0;
402 }
Gerald Van Baren35748172007-03-31 12:00:56 -0400403
Kumar Gala8d04f022007-10-24 11:04:22 -0500404 /* Need to reorder */
405 newsize = ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
406 + struct_size + fdt_size_dt_strings(fdt);
407
408 if (bufsize < newsize)
409 return -FDT_ERR_NOSPACE;
410
411 if (((buf + newsize) <= fdt)
412 || (buf >= (fdt + fdt_totalsize(fdt)))) {
413 tmp = buf;
414 } else {
415 tmp = (void *)fdt + fdt_totalsize(fdt);
416 if ((tmp + newsize) > (buf + bufsize))
417 return -FDT_ERR_NOSPACE;
418 }
419
420 _packblocks(fdt, tmp, mem_rsv_size, struct_size);
421 memmove(buf, tmp, newsize);
422
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));
Gerald Van Baren35748172007-03-31 12:00:56 -0400428
429 return 0;
430}
431
432int fdt_pack(void *fdt)
433{
Kumar Gala8d04f022007-10-24 11:04:22 -0500434 int mem_rsv_size;
Gerald Van Baren35748172007-03-31 12:00:56 -0400435 int err;
436
437 err = rw_check_header(fdt);
438 if (err)
439 return err;
440
Kumar Gala8d04f022007-10-24 11:04:22 -0500441 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));
445
Gerald Van Baren35748172007-03-31 12:00:56 -0400446 return 0;
447}