flattree.c revision 266130
1/* 2 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. 3 * 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of the 8 * License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 18 * USA 19 */ 20 21#include "dtc.h" 22#include "srcpos.h" 23 24#define FTF_FULLPATH 0x1 25#define FTF_VARALIGN 0x2 26#define FTF_NAMEPROPS 0x4 27#define FTF_BOOTCPUID 0x8 28#define FTF_STRTABSIZE 0x10 29#define FTF_STRUCTSIZE 0x20 30#define FTF_NOPS 0x40 31 32static struct version_info { 33 int version; 34 int last_comp_version; 35 int hdr_size; 36 int flags; 37} version_table[] = { 38 {1, 1, FDT_V1_SIZE, 39 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS}, 40 {2, 1, FDT_V2_SIZE, 41 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID}, 42 {3, 1, FDT_V3_SIZE, 43 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID|FTF_STRTABSIZE}, 44 {16, 16, FDT_V3_SIZE, 45 FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_NOPS}, 46 {17, 16, FDT_V17_SIZE, 47 FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_STRUCTSIZE|FTF_NOPS}, 48}; 49 50struct emitter { 51 void (*cell)(void *, cell_t); 52 void (*string)(void *, char *, int); 53 void (*align)(void *, int); 54 void (*data)(void *, struct data); 55 void (*beginnode)(void *, struct label *labels); 56 void (*endnode)(void *, struct label *labels); 57 void (*property)(void *, struct label *labels); 58}; 59 60static void bin_emit_cell(void *e, cell_t val) 61{ 62 struct data *dtbuf = e; 63 64 *dtbuf = data_append_cell(*dtbuf, val); 65} 66 67static void bin_emit_string(void *e, char *str, int len) 68{ 69 struct data *dtbuf = e; 70 71 if (len == 0) 72 len = strlen(str); 73 74 *dtbuf = data_append_data(*dtbuf, str, len); 75 *dtbuf = data_append_byte(*dtbuf, '\0'); 76} 77 78static void bin_emit_align(void *e, int a) 79{ 80 struct data *dtbuf = e; 81 82 *dtbuf = data_append_align(*dtbuf, a); 83} 84 85static void bin_emit_data(void *e, struct data d) 86{ 87 struct data *dtbuf = e; 88 89 *dtbuf = data_append_data(*dtbuf, d.val, d.len); 90} 91 92static void bin_emit_beginnode(void *e, struct label *labels) 93{ 94 bin_emit_cell(e, FDT_BEGIN_NODE); 95} 96 97static void bin_emit_endnode(void *e, struct label *labels) 98{ 99 bin_emit_cell(e, FDT_END_NODE); 100} 101 102static void bin_emit_property(void *e, struct label *labels) 103{ 104 bin_emit_cell(e, FDT_PROP); 105} 106 107static struct emitter bin_emitter = { 108 .cell = bin_emit_cell, 109 .string = bin_emit_string, 110 .align = bin_emit_align, 111 .data = bin_emit_data, 112 .beginnode = bin_emit_beginnode, 113 .endnode = bin_emit_endnode, 114 .property = bin_emit_property, 115}; 116 117static void emit_label(FILE *f, const char *prefix, const char *label) 118{ 119 fprintf(f, "\t.globl\t%s_%s\n", prefix, label); 120 fprintf(f, "%s_%s:\n", prefix, label); 121 fprintf(f, "_%s_%s:\n", prefix, label); 122} 123 124static void emit_offset_label(FILE *f, const char *label, int offset) 125{ 126 fprintf(f, "\t.globl\t%s\n", label); 127 fprintf(f, "%s\t= . + %d\n", label, offset); 128} 129 130#define ASM_EMIT_BELONG(f, fmt, ...) \ 131 { \ 132 fprintf((f), "\t.byte\t((" fmt ") >> 24) & 0xff\n", __VA_ARGS__); \ 133 fprintf((f), "\t.byte\t((" fmt ") >> 16) & 0xff\n", __VA_ARGS__); \ 134 fprintf((f), "\t.byte\t((" fmt ") >> 8) & 0xff\n", __VA_ARGS__); \ 135 fprintf((f), "\t.byte\t(" fmt ") & 0xff\n", __VA_ARGS__); \ 136 } 137 138static void asm_emit_cell(void *e, cell_t val) 139{ 140 FILE *f = e; 141 142 fprintf(f, "\t.byte 0x%02x; .byte 0x%02x; .byte 0x%02x; .byte 0x%02x\n", 143 (val >> 24) & 0xff, (val >> 16) & 0xff, 144 (val >> 8) & 0xff, val & 0xff); 145} 146 147static void asm_emit_string(void *e, char *str, int len) 148{ 149 FILE *f = e; 150 char c = 0; 151 152 if (len != 0) { 153 /* XXX: ewww */ 154 c = str[len]; 155 str[len] = '\0'; 156 } 157 158 fprintf(f, "\t.string\t\"%s\"\n", str); 159 160 if (len != 0) { 161 str[len] = c; 162 } 163} 164 165static void asm_emit_align(void *e, int a) 166{ 167 FILE *f = e; 168 169 fprintf(f, "\t.balign\t%d, 0\n", a); 170} 171 172static void asm_emit_data(void *e, struct data d) 173{ 174 FILE *f = e; 175 int off = 0; 176 struct marker *m = d.markers; 177 178 for_each_marker_of_type(m, LABEL) 179 emit_offset_label(f, m->ref, m->offset); 180 181 while ((d.len - off) >= sizeof(uint32_t)) { 182 asm_emit_cell(e, fdt32_to_cpu(*((uint32_t *)(d.val+off)))); 183 off += sizeof(uint32_t); 184 } 185 186 while ((d.len - off) >= 1) { 187 fprintf(f, "\t.byte\t0x%hhx\n", d.val[off]); 188 off += 1; 189 } 190 191 assert(off == d.len); 192} 193 194static void asm_emit_beginnode(void *e, struct label *labels) 195{ 196 FILE *f = e; 197 struct label *l; 198 199 for_each_label(labels, l) { 200 fprintf(f, "\t.globl\t%s\n", l->label); 201 fprintf(f, "%s:\n", l->label); 202 } 203 fprintf(f, "\t/* FDT_BEGIN_NODE */\n"); 204 asm_emit_cell(e, FDT_BEGIN_NODE); 205} 206 207static void asm_emit_endnode(void *e, struct label *labels) 208{ 209 FILE *f = e; 210 struct label *l; 211 212 fprintf(f, "\t/* FDT_END_NODE */\n"); 213 asm_emit_cell(e, FDT_END_NODE); 214 for_each_label(labels, l) { 215 fprintf(f, "\t.globl\t%s_end\n", l->label); 216 fprintf(f, "%s_end:\n", l->label); 217 } 218} 219 220static void asm_emit_property(void *e, struct label *labels) 221{ 222 FILE *f = e; 223 struct label *l; 224 225 for_each_label(labels, l) { 226 fprintf(f, "\t.globl\t%s\n", l->label); 227 fprintf(f, "%s:\n", l->label); 228 } 229 fprintf(f, "\t/* FDT_PROP */\n"); 230 asm_emit_cell(e, FDT_PROP); 231} 232 233static struct emitter asm_emitter = { 234 .cell = asm_emit_cell, 235 .string = asm_emit_string, 236 .align = asm_emit_align, 237 .data = asm_emit_data, 238 .beginnode = asm_emit_beginnode, 239 .endnode = asm_emit_endnode, 240 .property = asm_emit_property, 241}; 242 243static int stringtable_insert(struct data *d, const char *str) 244{ 245 int i; 246 247 /* FIXME: do this more efficiently? */ 248 249 for (i = 0; i < d->len; i++) { 250 if (streq(str, d->val + i)) 251 return i; 252 } 253 254 *d = data_append_data(*d, str, strlen(str)+1); 255 return i; 256} 257 258static void flatten_tree(struct node *tree, struct emitter *emit, 259 void *etarget, struct data *strbuf, 260 struct version_info *vi) 261{ 262 struct property *prop; 263 struct node *child; 264 bool seen_name_prop = false; 265 266 if (tree->deleted) 267 return; 268 269 emit->beginnode(etarget, tree->labels); 270 271 if (vi->flags & FTF_FULLPATH) 272 emit->string(etarget, tree->fullpath, 0); 273 else 274 emit->string(etarget, tree->name, 0); 275 276 emit->align(etarget, sizeof(cell_t)); 277 278 for_each_property(tree, prop) { 279 int nameoff; 280 281 if (streq(prop->name, "name")) 282 seen_name_prop = true; 283 284 nameoff = stringtable_insert(strbuf, prop->name); 285 286 emit->property(etarget, prop->labels); 287 emit->cell(etarget, prop->val.len); 288 emit->cell(etarget, nameoff); 289 290 if ((vi->flags & FTF_VARALIGN) && (prop->val.len >= 8)) 291 emit->align(etarget, 8); 292 293 emit->data(etarget, prop->val); 294 emit->align(etarget, sizeof(cell_t)); 295 } 296 297 if ((vi->flags & FTF_NAMEPROPS) && !seen_name_prop) { 298 emit->property(etarget, NULL); 299 emit->cell(etarget, tree->basenamelen+1); 300 emit->cell(etarget, stringtable_insert(strbuf, "name")); 301 302 if ((vi->flags & FTF_VARALIGN) && ((tree->basenamelen+1) >= 8)) 303 emit->align(etarget, 8); 304 305 emit->string(etarget, tree->name, tree->basenamelen); 306 emit->align(etarget, sizeof(cell_t)); 307 } 308 309 for_each_child(tree, child) { 310 flatten_tree(child, emit, etarget, strbuf, vi); 311 } 312 313 emit->endnode(etarget, tree->labels); 314} 315 316static struct data flatten_reserve_list(struct reserve_info *reservelist, 317 struct version_info *vi) 318{ 319 struct reserve_info *re; 320 struct data d = empty_data; 321 static struct fdt_reserve_entry null_re = {0,0}; 322 int j; 323 324 for (re = reservelist; re; re = re->next) { 325 d = data_append_re(d, &re->re); 326 } 327 /* 328 * Add additional reserved slots if the user asked for them. 329 */ 330 for (j = 0; j < reservenum; j++) { 331 d = data_append_re(d, &null_re); 332 } 333 334 return d; 335} 336 337static void make_fdt_header(struct fdt_header *fdt, 338 struct version_info *vi, 339 int reservesize, int dtsize, int strsize, 340 int boot_cpuid_phys) 341{ 342 int reserve_off; 343 344 reservesize += sizeof(struct fdt_reserve_entry); 345 346 memset(fdt, 0xff, sizeof(*fdt)); 347 348 fdt->magic = cpu_to_fdt32(FDT_MAGIC); 349 fdt->version = cpu_to_fdt32(vi->version); 350 fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version); 351 352 /* Reserve map should be doubleword aligned */ 353 reserve_off = ALIGN(vi->hdr_size, 8); 354 355 fdt->off_mem_rsvmap = cpu_to_fdt32(reserve_off); 356 fdt->off_dt_struct = cpu_to_fdt32(reserve_off + reservesize); 357 fdt->off_dt_strings = cpu_to_fdt32(reserve_off + reservesize 358 + dtsize); 359 fdt->totalsize = cpu_to_fdt32(reserve_off + reservesize + dtsize + strsize); 360 361 if (vi->flags & FTF_BOOTCPUID) 362 fdt->boot_cpuid_phys = cpu_to_fdt32(boot_cpuid_phys); 363 if (vi->flags & FTF_STRTABSIZE) 364 fdt->size_dt_strings = cpu_to_fdt32(strsize); 365 if (vi->flags & FTF_STRUCTSIZE) 366 fdt->size_dt_struct = cpu_to_fdt32(dtsize); 367} 368 369void dt_to_blob(FILE *f, struct boot_info *bi, int version) 370{ 371 struct version_info *vi = NULL; 372 int i; 373 struct data blob = empty_data; 374 struct data reservebuf = empty_data; 375 struct data dtbuf = empty_data; 376 struct data strbuf = empty_data; 377 struct fdt_header fdt; 378 int padlen = 0; 379 380 for (i = 0; i < ARRAY_SIZE(version_table); i++) { 381 if (version_table[i].version == version) 382 vi = &version_table[i]; 383 } 384 if (!vi) 385 die("Unknown device tree blob version %d\n", version); 386 387 flatten_tree(bi->dt, &bin_emitter, &dtbuf, &strbuf, vi); 388 bin_emit_cell(&dtbuf, FDT_END); 389 390 reservebuf = flatten_reserve_list(bi->reservelist, vi); 391 392 /* Make header */ 393 make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len, 394 bi->boot_cpuid_phys); 395 396 /* 397 * If the user asked for more space than is used, adjust the totalsize. 398 */ 399 if (minsize > 0) { 400 padlen = minsize - fdt32_to_cpu(fdt.totalsize); 401 if ((padlen < 0) && (quiet < 1)) 402 fprintf(stderr, 403 "Warning: blob size %d >= minimum size %d\n", 404 fdt32_to_cpu(fdt.totalsize), minsize); 405 } 406 407 if (padsize > 0) 408 padlen = padsize; 409 410 if (padlen > 0) { 411 int tsize = fdt32_to_cpu(fdt.totalsize); 412 tsize += padlen; 413 fdt.totalsize = cpu_to_fdt32(tsize); 414 } 415 416 /* 417 * Assemble the blob: start with the header, add with alignment 418 * the reserve buffer, add the reserve map terminating zeroes, 419 * the device tree itself, and finally the strings. 420 */ 421 blob = data_append_data(blob, &fdt, vi->hdr_size); 422 blob = data_append_align(blob, 8); 423 blob = data_merge(blob, reservebuf); 424 blob = data_append_zeroes(blob, sizeof(struct fdt_reserve_entry)); 425 blob = data_merge(blob, dtbuf); 426 blob = data_merge(blob, strbuf); 427 428 /* 429 * If the user asked for more space than is used, pad out the blob. 430 */ 431 if (padlen > 0) 432 blob = data_append_zeroes(blob, padlen); 433 434 if (fwrite(blob.val, blob.len, 1, f) != 1) { 435 if (ferror(f)) 436 die("Error writing device tree blob: %s\n", 437 strerror(errno)); 438 else 439 die("Short write on device tree blob\n"); 440 } 441 442 /* 443 * data_merge() frees the right-hand element so only the blob 444 * remains to be freed. 445 */ 446 data_free(blob); 447} 448 449static void dump_stringtable_asm(FILE *f, struct data strbuf) 450{ 451 const char *p; 452 int len; 453 454 p = strbuf.val; 455 456 while (p < (strbuf.val + strbuf.len)) { 457 len = strlen(p); 458 fprintf(f, "\t.string \"%s\"\n", p); 459 p += len+1; 460 } 461} 462 463void dt_to_asm(FILE *f, struct boot_info *bi, int version) 464{ 465 struct version_info *vi = NULL; 466 int i; 467 struct data strbuf = empty_data; 468 struct reserve_info *re; 469 const char *symprefix = "dt"; 470 471 for (i = 0; i < ARRAY_SIZE(version_table); i++) { 472 if (version_table[i].version == version) 473 vi = &version_table[i]; 474 } 475 if (!vi) 476 die("Unknown device tree blob version %d\n", version); 477 478 fprintf(f, "/* autogenerated by dtc, do not edit */\n\n"); 479 480 emit_label(f, symprefix, "blob_start"); 481 emit_label(f, symprefix, "header"); 482 fprintf(f, "\t/* magic */\n"); 483 asm_emit_cell(f, FDT_MAGIC); 484 fprintf(f, "\t/* totalsize */\n"); 485 ASM_EMIT_BELONG(f, "_%s_blob_abs_end - _%s_blob_start", 486 symprefix, symprefix); 487 fprintf(f, "\t/* off_dt_struct */\n"); 488 ASM_EMIT_BELONG(f, "_%s_struct_start - _%s_blob_start", 489 symprefix, symprefix); 490 fprintf(f, "\t/* off_dt_strings */\n"); 491 ASM_EMIT_BELONG(f, "_%s_strings_start - _%s_blob_start", 492 symprefix, symprefix); 493 fprintf(f, "\t/* off_mem_rsvmap */\n"); 494 ASM_EMIT_BELONG(f, "_%s_reserve_map - _%s_blob_start", 495 symprefix, symprefix); 496 fprintf(f, "\t/* version */\n"); 497 asm_emit_cell(f, vi->version); 498 fprintf(f, "\t/* last_comp_version */\n"); 499 asm_emit_cell(f, vi->last_comp_version); 500 501 if (vi->flags & FTF_BOOTCPUID) { 502 fprintf(f, "\t/* boot_cpuid_phys */\n"); 503 asm_emit_cell(f, bi->boot_cpuid_phys); 504 } 505 506 if (vi->flags & FTF_STRTABSIZE) { 507 fprintf(f, "\t/* size_dt_strings */\n"); 508 ASM_EMIT_BELONG(f, "_%s_strings_end - _%s_strings_start", 509 symprefix, symprefix); 510 } 511 512 if (vi->flags & FTF_STRUCTSIZE) { 513 fprintf(f, "\t/* size_dt_struct */\n"); 514 ASM_EMIT_BELONG(f, "_%s_struct_end - _%s_struct_start", 515 symprefix, symprefix); 516 } 517 518 /* 519 * Reserve map entries. 520 * Align the reserve map to a doubleword boundary. 521 * Each entry is an (address, size) pair of u64 values. 522 * Always supply a zero-sized temination entry. 523 */ 524 asm_emit_align(f, 8); 525 emit_label(f, symprefix, "reserve_map"); 526 527 fprintf(f, "/* Memory reserve map from source file */\n"); 528 529 /* 530 * Use .long on high and low halfs of u64s to avoid .quad 531 * as it appears .quad isn't available in some assemblers. 532 */ 533 for (re = bi->reservelist; re; re = re->next) { 534 struct label *l; 535 536 for_each_label(re->labels, l) { 537 fprintf(f, "\t.globl\t%s\n", l->label); 538 fprintf(f, "%s:\n", l->label); 539 } 540 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.address >> 32)); 541 ASM_EMIT_BELONG(f, "0x%08x", 542 (unsigned int)(re->re.address & 0xffffffff)); 543 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size >> 32)); 544 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size & 0xffffffff)); 545 } 546 for (i = 0; i < reservenum; i++) { 547 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); 548 } 549 550 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); 551 552 emit_label(f, symprefix, "struct_start"); 553 flatten_tree(bi->dt, &asm_emitter, f, &strbuf, vi); 554 555 fprintf(f, "\t/* FDT_END */\n"); 556 asm_emit_cell(f, FDT_END); 557 emit_label(f, symprefix, "struct_end"); 558 559 emit_label(f, symprefix, "strings_start"); 560 dump_stringtable_asm(f, strbuf); 561 emit_label(f, symprefix, "strings_end"); 562 563 emit_label(f, symprefix, "blob_end"); 564 565 /* 566 * If the user asked for more space than is used, pad it out. 567 */ 568 if (minsize > 0) { 569 fprintf(f, "\t.space\t%d - (_%s_blob_end - _%s_blob_start), 0\n", 570 minsize, symprefix, symprefix); 571 } 572 if (padsize > 0) { 573 fprintf(f, "\t.space\t%d, 0\n", padsize); 574 } 575 emit_label(f, symprefix, "blob_abs_end"); 576 577 data_free(strbuf); 578} 579 580struct inbuf { 581 char *base, *limit, *ptr; 582}; 583 584static void inbuf_init(struct inbuf *inb, void *base, void *limit) 585{ 586 inb->base = base; 587 inb->limit = limit; 588 inb->ptr = inb->base; 589} 590 591static void flat_read_chunk(struct inbuf *inb, void *p, int len) 592{ 593 if ((inb->ptr + len) > inb->limit) 594 die("Premature end of data parsing flat device tree\n"); 595 596 memcpy(p, inb->ptr, len); 597 598 inb->ptr += len; 599} 600 601static uint32_t flat_read_word(struct inbuf *inb) 602{ 603 uint32_t val; 604 605 assert(((inb->ptr - inb->base) % sizeof(val)) == 0); 606 607 flat_read_chunk(inb, &val, sizeof(val)); 608 609 return fdt32_to_cpu(val); 610} 611 612static void flat_realign(struct inbuf *inb, int align) 613{ 614 int off = inb->ptr - inb->base; 615 616 inb->ptr = inb->base + ALIGN(off, align); 617 if (inb->ptr > inb->limit) 618 die("Premature end of data parsing flat device tree\n"); 619} 620 621static char *flat_read_string(struct inbuf *inb) 622{ 623 int len = 0; 624 const char *p = inb->ptr; 625 char *str; 626 627 do { 628 if (p >= inb->limit) 629 die("Premature end of data parsing flat device tree\n"); 630 len++; 631 } while ((*p++) != '\0'); 632 633 str = xstrdup(inb->ptr); 634 635 inb->ptr += len; 636 637 flat_realign(inb, sizeof(uint32_t)); 638 639 return str; 640} 641 642static struct data flat_read_data(struct inbuf *inb, int len) 643{ 644 struct data d = empty_data; 645 646 if (len == 0) 647 return empty_data; 648 649 d = data_grow_for(d, len); 650 d.len = len; 651 652 flat_read_chunk(inb, d.val, len); 653 654 flat_realign(inb, sizeof(uint32_t)); 655 656 return d; 657} 658 659static char *flat_read_stringtable(struct inbuf *inb, int offset) 660{ 661 const char *p; 662 663 p = inb->base + offset; 664 while (1) { 665 if (p >= inb->limit || p < inb->base) 666 die("String offset %d overruns string table\n", 667 offset); 668 669 if (*p == '\0') 670 break; 671 672 p++; 673 } 674 675 return xstrdup(inb->base + offset); 676} 677 678static struct property *flat_read_property(struct inbuf *dtbuf, 679 struct inbuf *strbuf, int flags) 680{ 681 uint32_t proplen, stroff; 682 char *name; 683 struct data val; 684 685 proplen = flat_read_word(dtbuf); 686 stroff = flat_read_word(dtbuf); 687 688 name = flat_read_stringtable(strbuf, stroff); 689 690 if ((flags & FTF_VARALIGN) && (proplen >= 8)) 691 flat_realign(dtbuf, 8); 692 693 val = flat_read_data(dtbuf, proplen); 694 695 return build_property(name, val); 696} 697 698 699static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb) 700{ 701 struct reserve_info *reservelist = NULL; 702 struct reserve_info *new; 703 struct fdt_reserve_entry re; 704 705 /* 706 * Each entry is a pair of u64 (addr, size) values for 4 cell_t's. 707 * List terminates at an entry with size equal to zero. 708 * 709 * First pass, count entries. 710 */ 711 while (1) { 712 flat_read_chunk(inb, &re, sizeof(re)); 713 re.address = fdt64_to_cpu(re.address); 714 re.size = fdt64_to_cpu(re.size); 715 if (re.size == 0) 716 break; 717 718 new = build_reserve_entry(re.address, re.size); 719 reservelist = add_reserve_entry(reservelist, new); 720 } 721 722 return reservelist; 723} 724 725 726static char *nodename_from_path(const char *ppath, const char *cpath) 727{ 728 int plen; 729 730 plen = strlen(ppath); 731 732 if (!strneq(ppath, cpath, plen)) 733 die("Path \"%s\" is not valid as a child of \"%s\"\n", 734 cpath, ppath); 735 736 /* root node is a special case */ 737 if (!streq(ppath, "/")) 738 plen++; 739 740 return xstrdup(cpath + plen); 741} 742 743static struct node *unflatten_tree(struct inbuf *dtbuf, 744 struct inbuf *strbuf, 745 const char *parent_flatname, int flags) 746{ 747 struct node *node; 748 char *flatname; 749 uint32_t val; 750 751 node = build_node(NULL, NULL); 752 753 flatname = flat_read_string(dtbuf); 754 755 if (flags & FTF_FULLPATH) 756 node->name = nodename_from_path(parent_flatname, flatname); 757 else 758 node->name = flatname; 759 760 do { 761 struct property *prop; 762 struct node *child; 763 764 val = flat_read_word(dtbuf); 765 switch (val) { 766 case FDT_PROP: 767 if (node->children) 768 fprintf(stderr, "Warning: Flat tree input has " 769 "subnodes preceding a property.\n"); 770 prop = flat_read_property(dtbuf, strbuf, flags); 771 add_property(node, prop); 772 break; 773 774 case FDT_BEGIN_NODE: 775 child = unflatten_tree(dtbuf,strbuf, flatname, flags); 776 add_child(node, child); 777 break; 778 779 case FDT_END_NODE: 780 break; 781 782 case FDT_END: 783 die("Premature FDT_END in device tree blob\n"); 784 break; 785 786 case FDT_NOP: 787 if (!(flags & FTF_NOPS)) 788 fprintf(stderr, "Warning: NOP tag found in flat tree" 789 " version <16\n"); 790 791 /* Ignore */ 792 break; 793 794 default: 795 die("Invalid opcode word %08x in device tree blob\n", 796 val); 797 } 798 } while (val != FDT_END_NODE); 799 800 return node; 801} 802 803 804struct boot_info *dt_from_blob(const char *fname) 805{ 806 FILE *f; 807 uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys; 808 uint32_t off_dt, off_str, off_mem_rsvmap; 809 int rc; 810 char *blob; 811 struct fdt_header *fdt; 812 char *p; 813 struct inbuf dtbuf, strbuf; 814 struct inbuf memresvbuf; 815 int sizeleft; 816 struct reserve_info *reservelist; 817 struct node *tree; 818 uint32_t val; 819 int flags = 0; 820 821 f = srcfile_relative_open(fname, NULL); 822 823 rc = fread(&magic, sizeof(magic), 1, f); 824 if (ferror(f)) 825 die("Error reading DT blob magic number: %s\n", 826 strerror(errno)); 827 if (rc < 1) { 828 if (feof(f)) 829 die("EOF reading DT blob magic number\n"); 830 else 831 die("Mysterious short read reading magic number\n"); 832 } 833 834 magic = fdt32_to_cpu(magic); 835 if (magic != FDT_MAGIC) 836 die("Blob has incorrect magic number\n"); 837 838 rc = fread(&totalsize, sizeof(totalsize), 1, f); 839 if (ferror(f)) 840 die("Error reading DT blob size: %s\n", strerror(errno)); 841 if (rc < 1) { 842 if (feof(f)) 843 die("EOF reading DT blob size\n"); 844 else 845 die("Mysterious short read reading blob size\n"); 846 } 847 848 totalsize = fdt32_to_cpu(totalsize); 849 if (totalsize < FDT_V1_SIZE) 850 die("DT blob size (%d) is too small\n", totalsize); 851 852 blob = xmalloc(totalsize); 853 854 fdt = (struct fdt_header *)blob; 855 fdt->magic = cpu_to_fdt32(magic); 856 fdt->totalsize = cpu_to_fdt32(totalsize); 857 858 sizeleft = totalsize - sizeof(magic) - sizeof(totalsize); 859 p = blob + sizeof(magic) + sizeof(totalsize); 860 861 while (sizeleft) { 862 if (feof(f)) 863 die("EOF before reading %d bytes of DT blob\n", 864 totalsize); 865 866 rc = fread(p, 1, sizeleft, f); 867 if (ferror(f)) 868 die("Error reading DT blob: %s\n", 869 strerror(errno)); 870 871 sizeleft -= rc; 872 p += rc; 873 } 874 875 off_dt = fdt32_to_cpu(fdt->off_dt_struct); 876 off_str = fdt32_to_cpu(fdt->off_dt_strings); 877 off_mem_rsvmap = fdt32_to_cpu(fdt->off_mem_rsvmap); 878 version = fdt32_to_cpu(fdt->version); 879 boot_cpuid_phys = fdt32_to_cpu(fdt->boot_cpuid_phys); 880 881 if (off_mem_rsvmap >= totalsize) 882 die("Mem Reserve structure offset exceeds total size\n"); 883 884 if (off_dt >= totalsize) 885 die("DT structure offset exceeds total size\n"); 886 887 if (off_str > totalsize) 888 die("String table offset exceeds total size\n"); 889 890 if (version >= 3) { 891 uint32_t size_str = fdt32_to_cpu(fdt->size_dt_strings); 892 if (off_str+size_str > totalsize) 893 die("String table extends past total size\n"); 894 inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str); 895 } else { 896 inbuf_init(&strbuf, blob + off_str, blob + totalsize); 897 } 898 899 if (version >= 17) { 900 size_dt = fdt32_to_cpu(fdt->size_dt_struct); 901 if (off_dt+size_dt > totalsize) 902 die("Structure block extends past total size\n"); 903 } 904 905 if (version < 16) { 906 flags |= FTF_FULLPATH | FTF_NAMEPROPS | FTF_VARALIGN; 907 } else { 908 flags |= FTF_NOPS; 909 } 910 911 inbuf_init(&memresvbuf, 912 blob + off_mem_rsvmap, blob + totalsize); 913 inbuf_init(&dtbuf, blob + off_dt, blob + totalsize); 914 915 reservelist = flat_read_mem_reserve(&memresvbuf); 916 917 val = flat_read_word(&dtbuf); 918 919 if (val != FDT_BEGIN_NODE) 920 die("Device tree blob doesn't begin with FDT_BEGIN_NODE (begins with 0x%08x)\n", val); 921 922 tree = unflatten_tree(&dtbuf, &strbuf, "", flags); 923 924 val = flat_read_word(&dtbuf); 925 if (val != FDT_END) 926 die("Device tree blob doesn't end with FDT_END\n"); 927 928 free(blob); 929 930 fclose(f); 931 932 return build_boot_info(reservelist, tree, boot_cpuid_phys); 933} 934