1 /* 2 * libfdt - Flat Device Tree manipulation 3 * Copyright (C) 2006 David Gibson, IBM Corporation. 4 * 5 * libfdt is dual licensed: you can use it either under the terms of 6 * the GPL, or the BSD license, at your option. 7 * 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. 12 * 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. 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. 50 */ 51 #include "libfdt_env.h" 52 53 #include <fdt.h> 54 #include <libfdt.h> 55 56 #include "libfdt_internal.h" 57 58 static int _fdt_blocks_misordered(const void *fdt, 59 int mem_rsv_size, int struct_size) 60 { 61 return (fdt_off_mem_rsvmap(fdt) < 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 70 static int _fdt_rw_check_header(void *fdt) 71 { 72 FDT_CHECK_HEADER(fdt); 73 74 if (fdt_version(fdt) < 17) 75 return -FDT_ERR_BADVERSION; 76 if (_fdt_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry), 77 fdt_size_dt_struct(fdt))) 78 return -FDT_ERR_BADLAYOUT; 79 if (fdt_version(fdt) > 17) 80 fdt_set_version(fdt, 17); 81 82 return 0; 83 } 84 85 #define FDT_RW_CHECK_HEADER(fdt) \ 86 { \ 87 int __err; \ 88 if ((__err = _fdt_rw_check_header(fdt)) != 0) \ 89 return __err; \ 90 } 91 92 static inline int _fdt_data_size(void *fdt) 93 { 94 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); 95 } 96 97 static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen) 98 { 99 char *p = splicepoint; 100 char *end = (char *)fdt + _fdt_data_size(fdt); 101 102 if (((p + oldlen) < p) || ((p + oldlen) > end)) 103 return -FDT_ERR_BADOFFSET; 104 if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt)) 105 return -FDT_ERR_BADOFFSET; 106 if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt))) 107 return -FDT_ERR_NOSPACE; 108 memmove(p + newlen, p + oldlen, end - p - oldlen); 109 return 0; 110 } 111 112 static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p, 113 int oldn, int newn) 114 { 115 int delta = (newn - oldn) * sizeof(*p); 116 int err; 117 err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p)); 118 if (err) 119 return err; 120 fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta); 121 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta); 122 return 0; 123 } 124 125 static int _fdt_splice_struct(void *fdt, void *p, 126 int oldlen, int newlen) 127 { 128 int delta = newlen - oldlen; 129 int err; 130 131 if ((err = _fdt_splice(fdt, p, oldlen, newlen))) 132 return err; 133 134 fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta); 135 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta); 136 return 0; 137 } 138 139 static int _fdt_splice_string(void *fdt, int newlen) 140 { 141 void *p = (char *)fdt 142 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); 143 int err; 144 145 if ((err = _fdt_splice(fdt, p, 0, newlen))) 146 return err; 147 148 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen); 149 return 0; 150 } 151 152 static int _fdt_find_add_string(void *fdt, const char *s) 153 { 154 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt); 155 const char *p; 156 char *new; 157 int len = strlen(s) + 1; 158 int err; 159 160 p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s); 161 if (p) 162 /* found it */ 163 return (p - strtab); 164 165 new = strtab + fdt_size_dt_strings(fdt); 166 err = _fdt_splice_string(fdt, len); 167 if (err) 168 return err; 169 170 memcpy(new, s, len); 171 return (new - strtab); 172 } 173 174 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size) 175 { 176 struct fdt_reserve_entry *re; 177 int err; 178 179 FDT_RW_CHECK_HEADER(fdt); 180 181 re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt)); 182 err = _fdt_splice_mem_rsv(fdt, re, 0, 1); 183 if (err) 184 return err; 185 186 re->address = cpu_to_fdt64(address); 187 re->size = cpu_to_fdt64(size); 188 return 0; 189 } 190 191 int fdt_del_mem_rsv(void *fdt, int n) 192 { 193 struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n); 194 int err; 195 196 FDT_RW_CHECK_HEADER(fdt); 197 198 if (n >= fdt_num_mem_rsv(fdt)) 199 return -FDT_ERR_NOTFOUND; 200 201 err = _fdt_splice_mem_rsv(fdt, re, 1, 0); 202 if (err) 203 return err; 204 return 0; 205 } 206 207 static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name, 208 int len, struct fdt_property **prop) 209 { 210 int oldlen; 211 int err; 212 213 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); 214 if (! (*prop)) 215 return oldlen; 216 217 if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen), 218 FDT_TAGALIGN(len)))) 219 return err; 220 221 (*prop)->len = cpu_to_fdt32(len); 222 return 0; 223 } 224 225 static int _fdt_add_property(void *fdt, int nodeoffset, const char *name, 226 int len, struct fdt_property **prop) 227 { 228 int proplen; 229 int nextoffset; 230 int namestroff; 231 int err; 232 233 if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0) 234 return nextoffset; 235 236 namestroff = _fdt_find_add_string(fdt, name); 237 if (namestroff < 0) 238 return namestroff; 239 240 *prop = _fdt_offset_ptr_w(fdt, nextoffset); 241 proplen = sizeof(**prop) + FDT_TAGALIGN(len); 242 243 err = _fdt_splice_struct(fdt, *prop, 0, proplen); 244 if (err) 245 return err; 246 247 (*prop)->tag = cpu_to_fdt32(FDT_PROP); 248 (*prop)->nameoff = cpu_to_fdt32(namestroff); 249 (*prop)->len = cpu_to_fdt32(len); 250 return 0; 251 } 252 253 int fdt_set_name(void *fdt, int nodeoffset, const char *name) 254 { 255 char *namep; 256 int oldlen, newlen; 257 int err; 258 259 FDT_RW_CHECK_HEADER(fdt); 260 261 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen); 262 if (!namep) 263 return oldlen; 264 265 newlen = strlen(name); 266 267 err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1), 268 FDT_TAGALIGN(newlen+1)); 269 if (err) 270 return err; 271 272 memcpy(namep, name, newlen+1); 273 return 0; 274 } 275 276 int fdt_setprop(void *fdt, int nodeoffset, const char *name, 277 const void *val, int len) 278 { 279 struct fdt_property *prop; 280 int err; 281 282 FDT_RW_CHECK_HEADER(fdt); 283 284 err = _fdt_resize_property(fdt, nodeoffset, name, len, &prop); 285 if (err == -FDT_ERR_NOTFOUND) 286 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop); 287 if (err) 288 return err; 289 290 memcpy(prop->data, val, len); 291 return 0; 292 } 293 294 int fdt_appendprop(void *fdt, int nodeoffset, const char *name, 295 const void *val, int len) 296 { 297 struct fdt_property *prop; 298 int err, oldlen, newlen; 299 300 FDT_RW_CHECK_HEADER(fdt); 301 302 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); 303 if (prop) { 304 newlen = len + oldlen; 305 err = _fdt_splice_struct(fdt, prop->data, 306 FDT_TAGALIGN(oldlen), 307 FDT_TAGALIGN(newlen)); 308 if (err) 309 return err; 310 prop->len = cpu_to_fdt32(newlen); 311 memcpy(prop->data + oldlen, val, len); 312 } else { 313 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop); 314 if (err) 315 return err; 316 memcpy(prop->data, val, len); 317 } 318 return 0; 319 } 320 321 int fdt_delprop(void *fdt, int nodeoffset, const char *name) 322 { 323 struct fdt_property *prop; 324 int len, proplen; 325 326 FDT_RW_CHECK_HEADER(fdt); 327 328 prop = fdt_get_property_w(fdt, nodeoffset, name, &len); 329 if (! prop) 330 return len; 331 332 proplen = sizeof(*prop) + FDT_TAGALIGN(len); 333 return _fdt_splice_struct(fdt, prop, proplen, 0); 334 } 335 336 int fdt_add_subnode_namelen(void *fdt, int parentoffset, 337 const char *name, int namelen) 338 { 339 struct fdt_node_header *nh; 340 int offset, nextoffset; 341 int nodelen; 342 int err; 343 uint32_t tag; 344 fdt32_t *endtag; 345 346 FDT_RW_CHECK_HEADER(fdt); 347 348 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen); 349 if (offset >= 0) 350 return -FDT_ERR_EXISTS; 351 else if (offset != -FDT_ERR_NOTFOUND) 352 return offset; 353 354 /* Try to place the new node after the parent's properties */ 355 fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */ 356 do { 357 offset = nextoffset; 358 tag = fdt_next_tag(fdt, offset, &nextoffset); 359 } while ((tag == FDT_PROP) || (tag == FDT_NOP)); 360 361 nh = _fdt_offset_ptr_w(fdt, offset); 362 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE; 363 364 err = _fdt_splice_struct(fdt, nh, 0, nodelen); 365 if (err) 366 return err; 367 368 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE); 369 memset(nh->name, 0, FDT_TAGALIGN(namelen+1)); 370 memcpy(nh->name, name, namelen); 371 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE); 372 *endtag = cpu_to_fdt32(FDT_END_NODE); 373 374 return offset; 375 } 376 377 int fdt_add_subnode(void *fdt, int parentoffset, const char *name) 378 { 379 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name)); 380 } 381 382 int fdt_del_node(void *fdt, int nodeoffset) 383 { 384 int endoffset; 385 386 FDT_RW_CHECK_HEADER(fdt); 387 388 endoffset = _fdt_node_end_offset(fdt, nodeoffset); 389 if (endoffset < 0) 390 return endoffset; 391 392 return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset), 393 endoffset - nodeoffset, 0); 394 } 395 396 static void _fdt_packblocks(const char *old, char *new, 397 int mem_rsv_size, int struct_size) 398 { 399 int mem_rsv_off, struct_off, strings_off; 400 401 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8); 402 struct_off = mem_rsv_off + mem_rsv_size; 403 strings_off = struct_off + struct_size; 404 405 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size); 406 fdt_set_off_mem_rsvmap(new, mem_rsv_off); 407 408 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size); 409 fdt_set_off_dt_struct(new, struct_off); 410 fdt_set_size_dt_struct(new, struct_size); 411 412 memmove(new + strings_off, old + fdt_off_dt_strings(old), 413 fdt_size_dt_strings(old)); 414 fdt_set_off_dt_strings(new, strings_off); 415 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old)); 416 } 417 418 int fdt_open_into(const void *fdt, void *buf, int bufsize) 419 { 420 int err; 421 int mem_rsv_size, struct_size; 422 int newsize; 423 const char *fdtstart = fdt; 424 const char *fdtend = fdtstart + fdt_totalsize(fdt); 425 char *tmp; 426 427 FDT_CHECK_HEADER(fdt); 428 429 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) 430 * sizeof(struct fdt_reserve_entry); 431 432 if (fdt_version(fdt) >= 17) { 433 struct_size = fdt_size_dt_struct(fdt); 434 } else { 435 struct_size = 0; 436 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END) 437 ; 438 if (struct_size < 0) 439 return struct_size; 440 } 441 442 if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) { 443 /* no further work necessary */ 444 err = fdt_move(fdt, buf, bufsize); 445 if (err) 446 return err; 447 fdt_set_version(buf, 17); 448 fdt_set_size_dt_struct(buf, struct_size); 449 fdt_set_totalsize(buf, bufsize); 450 return 0; 451 } 452 453 /* Need to reorder */ 454 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size 455 + struct_size + fdt_size_dt_strings(fdt); 456 457 if (bufsize < newsize) 458 return -FDT_ERR_NOSPACE; 459 460 /* First attempt to build converted tree at beginning of buffer */ 461 tmp = buf; 462 /* But if that overlaps with the old tree... */ 463 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) { 464 /* Try right after the old tree instead */ 465 tmp = (char *)(uintptr_t)fdtend; 466 if ((tmp + newsize) > ((char *)buf + bufsize)) 467 return -FDT_ERR_NOSPACE; 468 } 469 470 _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size); 471 memmove(buf, tmp, newsize); 472 473 fdt_set_magic(buf, FDT_MAGIC); 474 fdt_set_totalsize(buf, bufsize); 475 fdt_set_version(buf, 17); 476 fdt_set_last_comp_version(buf, 16); 477 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt)); 478 479 return 0; 480 } 481 482 int fdt_pack(void *fdt) 483 { 484 int mem_rsv_size; 485 486 FDT_RW_CHECK_HEADER(fdt); 487 488 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) 489 * sizeof(struct fdt_reserve_entry); 490 _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt)); 491 fdt_set_totalsize(fdt, _fdt_data_size(fdt)); 492 493 return 0; 494 } 495