1 /* $NetBSD: fdt_rw.c,v 1.1.1.2 2017/06/08 15:53:12 skrll Exp $ */ 2 3 /* 4 * libfdt - Flat Device Tree manipulation 5 * Copyright (C) 2006 David Gibson, IBM Corporation. 6 * 7 * libfdt is dual licensed: you can use it either under the terms of 8 * the GPL, or the BSD license, at your option. 9 * 10 * a) This library is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of the 13 * License, or (at your option) any later version. 14 * 15 * This library is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this library; if not, write to the Free 22 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, 23 * MA 02110-1301 USA 24 * 25 * Alternatively, 26 * 27 * b) Redistribution and use in source and binary forms, with or 28 * without modification, are permitted provided that the following 29 * conditions are met: 30 * 31 * 1. Redistributions of source code must retain the above 32 * copyright notice, this list of conditions and the following 33 * disclaimer. 34 * 2. Redistributions in binary form must reproduce the above 35 * copyright notice, this list of conditions and the following 36 * disclaimer in the documentation and/or other materials 37 * provided with the distribution. 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 40 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 41 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 42 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 43 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 44 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 49 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 50 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 51 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 52 */ 53 #include "libfdt_env.h" 54 55 #include <fdt.h> 56 #include <libfdt.h> 57 58 #include "libfdt_internal.h" 59 60 static int _fdt_blocks_misordered(const void *fdt, 61 int mem_rsv_size, int struct_size) 62 { 63 return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8)) 64 || (fdt_off_dt_struct(fdt) < 65 (fdt_off_mem_rsvmap(fdt) + mem_rsv_size)) 66 || (fdt_off_dt_strings(fdt) < 67 (fdt_off_dt_struct(fdt) + struct_size)) 68 || (fdt_totalsize(fdt) < 69 (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt))); 70 } 71 72 static int _fdt_rw_check_header(void *fdt) 73 { 74 FDT_CHECK_HEADER(fdt); 75 76 if (fdt_version(fdt) < 17) 77 return -FDT_ERR_BADVERSION; 78 if (_fdt_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); 83 84 return 0; 85 } 86 87 #define FDT_RW_CHECK_HEADER(fdt) \ 88 { \ 89 int __err; \ 90 if ((__err = _fdt_rw_check_header(fdt)) != 0) \ 91 return __err; \ 92 } 93 94 static inline int _fdt_data_size(void *fdt) 95 { 96 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); 97 } 98 99 static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen) 100 { 101 char *p = splicepoint; 102 char *end = (char *)fdt + _fdt_data_size(fdt); 103 104 if (((p + oldlen) < p) || ((p + oldlen) > end)) 105 return -FDT_ERR_BADOFFSET; 106 if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt)) 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); 111 return 0; 112 } 113 114 static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p, 115 int oldn, int newn) 116 { 117 int delta = (newn - oldn) * sizeof(*p); 118 int err; 119 err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p)); 120 if (err) 121 return err; 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); 124 return 0; 125 } 126 127 static int _fdt_splice_struct(void *fdt, void *p, 128 int oldlen, int newlen) 129 { 130 int delta = newlen - oldlen; 131 int err; 132 133 if ((err = _fdt_splice(fdt, p, oldlen, newlen))) 134 return err; 135 136 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); 138 return 0; 139 } 140 141 static int _fdt_splice_string(void *fdt, int newlen) 142 { 143 void *p = (char *)fdt 144 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); 145 int err; 146 147 if ((err = _fdt_splice(fdt, p, 0, newlen))) 148 return err; 149 150 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen); 151 return 0; 152 } 153 154 static int _fdt_find_add_string(void *fdt, const char *s) 155 { 156 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt); 157 const char *p; 158 char *new; 159 int len = strlen(s) + 1; 160 int err; 161 162 p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s); 163 if (p) 164 /* found it */ 165 return (p - strtab); 166 167 new = strtab + fdt_size_dt_strings(fdt); 168 err = _fdt_splice_string(fdt, len); 169 if (err) 170 return err; 171 172 memcpy(new, s, len); 173 return (new - strtab); 174 } 175 176 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size) 177 { 178 struct fdt_reserve_entry *re; 179 int err; 180 181 FDT_RW_CHECK_HEADER(fdt); 182 183 re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt)); 184 err = _fdt_splice_mem_rsv(fdt, re, 0, 1); 185 if (err) 186 return err; 187 188 re->address = cpu_to_fdt64(address); 189 re->size = cpu_to_fdt64(size); 190 return 0; 191 } 192 193 int fdt_del_mem_rsv(void *fdt, int n) 194 { 195 struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n); 196 197 FDT_RW_CHECK_HEADER(fdt); 198 199 if (n >= fdt_num_mem_rsv(fdt)) 200 return -FDT_ERR_NOTFOUND; 201 202 return _fdt_splice_mem_rsv(fdt, re, 1, 0); 203 } 204 205 static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name, 206 int len, struct fdt_property **prop) 207 { 208 int oldlen; 209 int err; 210 211 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); 212 if (! (*prop)) 213 return oldlen; 214 215 if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen), 216 FDT_TAGALIGN(len)))) 217 return err; 218 219 (*prop)->len = cpu_to_fdt32(len); 220 return 0; 221 } 222 223 static int _fdt_add_property(void *fdt, int nodeoffset, const char *name, 224 int len, struct fdt_property **prop) 225 { 226 int proplen; 227 int nextoffset; 228 int namestroff; 229 int err; 230 231 if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0) 232 return nextoffset; 233 234 namestroff = _fdt_find_add_string(fdt, name); 235 if (namestroff < 0) 236 return namestroff; 237 238 *prop = _fdt_offset_ptr_w(fdt, nextoffset); 239 proplen = sizeof(**prop) + FDT_TAGALIGN(len); 240 241 err = _fdt_splice_struct(fdt, *prop, 0, proplen); 242 if (err) 243 return err; 244 245 (*prop)->tag = cpu_to_fdt32(FDT_PROP); 246 (*prop)->nameoff = cpu_to_fdt32(namestroff); 247 (*prop)->len = cpu_to_fdt32(len); 248 return 0; 249 } 250 251 int fdt_set_name(void *fdt, int nodeoffset, const char *name) 252 { 253 char *namep; 254 int oldlen, newlen; 255 int err; 256 257 FDT_RW_CHECK_HEADER(fdt); 258 259 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen); 260 if (!namep) 261 return oldlen; 262 263 newlen = strlen(name); 264 265 err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1), 266 FDT_TAGALIGN(newlen+1)); 267 if (err) 268 return err; 269 270 memcpy(namep, name, newlen+1); 271 return 0; 272 } 273 274 int fdt_setprop(void *fdt, int nodeoffset, const char *name, 275 const void *val, int len) 276 { 277 struct fdt_property *prop; 278 int err; 279 280 FDT_RW_CHECK_HEADER(fdt); 281 282 err = _fdt_resize_property(fdt, nodeoffset, name, len, &prop); 283 if (err == -FDT_ERR_NOTFOUND) 284 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop); 285 if (err) 286 return err; 287 288 if (len) 289 memcpy(prop->data, val, len); 290 return 0; 291 } 292 293 int fdt_appendprop(void *fdt, int nodeoffset, const char *name, 294 const void *val, int len) 295 { 296 struct fdt_property *prop; 297 int err, oldlen, newlen; 298 299 FDT_RW_CHECK_HEADER(fdt); 300 301 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen); 302 if (prop) { 303 newlen = len + oldlen; 304 err = _fdt_splice_struct(fdt, prop->data, 305 FDT_TAGALIGN(oldlen), 306 FDT_TAGALIGN(newlen)); 307 if (err) 308 return err; 309 prop->len = cpu_to_fdt32(newlen); 310 memcpy(prop->data + oldlen, val, len); 311 } else { 312 err = _fdt_add_property(fdt, nodeoffset, name, len, &prop); 313 if (err) 314 return err; 315 memcpy(prop->data, val, len); 316 } 317 return 0; 318 } 319 320 int fdt_delprop(void *fdt, int nodeoffset, const char *name) 321 { 322 struct fdt_property *prop; 323 int len, proplen; 324 325 FDT_RW_CHECK_HEADER(fdt); 326 327 prop = fdt_get_property_w(fdt, nodeoffset, name, &len); 328 if (! prop) 329 return len; 330 331 proplen = sizeof(*prop) + FDT_TAGALIGN(len); 332 return _fdt_splice_struct(fdt, prop, proplen, 0); 333 } 334 335 int fdt_add_subnode_namelen(void *fdt, int parentoffset, 336 const char *name, int namelen) 337 { 338 struct fdt_node_header *nh; 339 int offset, nextoffset; 340 int nodelen; 341 int err; 342 uint32_t tag; 343 fdt32_t *endtag; 344 345 FDT_RW_CHECK_HEADER(fdt); 346 347 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen); 348 if (offset >= 0) 349 return -FDT_ERR_EXISTS; 350 else if (offset != -FDT_ERR_NOTFOUND) 351 return offset; 352 353 /* Try to place the new node after the parent's properties */ 354 fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */ 355 do { 356 offset = nextoffset; 357 tag = fdt_next_tag(fdt, offset, &nextoffset); 358 } while ((tag == FDT_PROP) || (tag == FDT_NOP)); 359 360 nh = _fdt_offset_ptr_w(fdt, offset); 361 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE; 362 363 err = _fdt_splice_struct(fdt, nh, 0, nodelen); 364 if (err) 365 return err; 366 367 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE); 368 memset(nh->name, 0, FDT_TAGALIGN(namelen+1)); 369 memcpy(nh->name, name, namelen); 370 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE); 371 *endtag = cpu_to_fdt32(FDT_END_NODE); 372 373 return offset; 374 } 375 376 int fdt_add_subnode(void *fdt, int parentoffset, const char *name) 377 { 378 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name)); 379 } 380 381 int fdt_del_node(void *fdt, int nodeoffset) 382 { 383 int endoffset; 384 385 FDT_RW_CHECK_HEADER(fdt); 386 387 endoffset = _fdt_node_end_offset(fdt, nodeoffset); 388 if (endoffset < 0) 389 return endoffset; 390 391 return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset), 392 endoffset - nodeoffset, 0); 393 } 394 395 static void _fdt_packblocks(const char *old, char *new, 396 int mem_rsv_size, int struct_size) 397 { 398 int mem_rsv_off, struct_off, strings_off; 399 400 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8); 401 struct_off = mem_rsv_off + mem_rsv_size; 402 strings_off = struct_off + struct_size; 403 404 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size); 405 fdt_set_off_mem_rsvmap(new, mem_rsv_off); 406 407 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size); 408 fdt_set_off_dt_struct(new, struct_off); 409 fdt_set_size_dt_struct(new, struct_size); 410 411 memmove(new + strings_off, old + fdt_off_dt_strings(old), 412 fdt_size_dt_strings(old)); 413 fdt_set_off_dt_strings(new, strings_off); 414 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old)); 415 } 416 417 int fdt_open_into(const void *fdt, void *buf, int bufsize) 418 { 419 int err; 420 int mem_rsv_size, struct_size; 421 int newsize; 422 const char *fdtstart = fdt; 423 const char *fdtend = fdtstart + fdt_totalsize(fdt); 424 char *tmp; 425 426 FDT_CHECK_HEADER(fdt); 427 428 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) 429 * sizeof(struct fdt_reserve_entry); 430 431 if (fdt_version(fdt) >= 17) { 432 struct_size = fdt_size_dt_struct(fdt); 433 } else { 434 struct_size = 0; 435 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END) 436 ; 437 if (struct_size < 0) 438 return struct_size; 439 } 440 441 if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) { 442 /* no further work necessary */ 443 err = fdt_move(fdt, buf, bufsize); 444 if (err) 445 return err; 446 fdt_set_version(buf, 17); 447 fdt_set_size_dt_struct(buf, struct_size); 448 fdt_set_totalsize(buf, bufsize); 449 return 0; 450 } 451 452 /* Need to reorder */ 453 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size 454 + struct_size + fdt_size_dt_strings(fdt); 455 456 if (bufsize < newsize) 457 return -FDT_ERR_NOSPACE; 458 459 /* First attempt to build converted tree at beginning of buffer */ 460 tmp = buf; 461 /* But if that overlaps with the old tree... */ 462 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) { 463 /* Try right after the old tree instead */ 464 tmp = (char *)(uintptr_t)fdtend; 465 if ((tmp + newsize) > ((char *)buf + bufsize)) 466 return -FDT_ERR_NOSPACE; 467 } 468 469 _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size); 470 memmove(buf, tmp, newsize); 471 472 fdt_set_magic(buf, FDT_MAGIC); 473 fdt_set_totalsize(buf, bufsize); 474 fdt_set_version(buf, 17); 475 fdt_set_last_comp_version(buf, 16); 476 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt)); 477 478 return 0; 479 } 480 481 int fdt_pack(void *fdt) 482 { 483 int mem_rsv_size; 484 485 FDT_RW_CHECK_HEADER(fdt); 486 487 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1) 488 * sizeof(struct fdt_reserve_entry); 489 _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt)); 490 fdt_set_totalsize(fdt, _fdt_data_size(fdt)); 491 492 return 0; 493 } 494