1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. 4 */ 5 6 #include "dtc.h" 7 #include "srcpos.h" 8 9 #define FTF_FULLPATH 0x1 10 #define FTF_VARALIGN 0x2 11 #define FTF_NAMEPROPS 0x4 12 #define FTF_BOOTCPUID 0x8 13 #define FTF_STRTABSIZE 0x10 14 #define FTF_STRUCTSIZE 0x20 15 #define FTF_NOPS 0x40 16 17 static struct version_info { 18 int version; 19 int last_comp_version; 20 int hdr_size; 21 int flags; 22 } version_table[] = { 23 {1, 1, FDT_V1_SIZE, 24 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS}, 25 {2, 1, FDT_V2_SIZE, 26 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID}, 27 {3, 1, FDT_V3_SIZE, 28 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID|FTF_STRTABSIZE}, 29 {16, 16, FDT_V3_SIZE, 30 FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_NOPS}, 31 {17, 16, FDT_V17_SIZE, 32 FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_STRUCTSIZE|FTF_NOPS}, 33 }; 34 35 struct emitter { 36 void (*cell)(void *, cell_t); 37 void (*string)(void *, const char *, int); 38 void (*align)(void *, int); 39 void (*data)(void *, struct data); 40 void (*beginnode)(void *, struct label *labels); 41 void (*endnode)(void *, struct label *labels); 42 void (*property)(void *, struct label *labels); 43 }; 44 45 static void bin_emit_cell(void *e, cell_t val) 46 { 47 struct data *dtbuf = e; 48 49 *dtbuf = data_append_cell(*dtbuf, val); 50 } 51 52 static void bin_emit_string(void *e, const char *str, int len) 53 { 54 struct data *dtbuf = e; 55 56 if (len == 0) 57 len = strlen(str); 58 59 *dtbuf = data_append_data(*dtbuf, str, len); 60 *dtbuf = data_append_byte(*dtbuf, '\0'); 61 } 62 63 static void bin_emit_align(void *e, int a) 64 { 65 struct data *dtbuf = e; 66 67 *dtbuf = data_append_align(*dtbuf, a); 68 } 69 70 static void bin_emit_data(void *e, struct data d) 71 { 72 struct data *dtbuf = e; 73 74 *dtbuf = data_append_data(*dtbuf, d.val, d.len); 75 } 76 77 static void bin_emit_beginnode(void *e, struct label *labels) 78 { 79 bin_emit_cell(e, FDT_BEGIN_NODE); 80 } 81 82 static void bin_emit_endnode(void *e, struct label *labels) 83 { 84 bin_emit_cell(e, FDT_END_NODE); 85 } 86 87 static void bin_emit_property(void *e, struct label *labels) 88 { 89 bin_emit_cell(e, FDT_PROP); 90 } 91 92 static struct emitter bin_emitter = { 93 .cell = bin_emit_cell, 94 .string = bin_emit_string, 95 .align = bin_emit_align, 96 .data = bin_emit_data, 97 .beginnode = bin_emit_beginnode, 98 .endnode = bin_emit_endnode, 99 .property = bin_emit_property, 100 }; 101 102 static void emit_label(FILE *f, const char *prefix, const char *label) 103 { 104 fprintf(f, "\t.globl\t%s_%s\n", prefix, label); 105 fprintf(f, "%s_%s:\n", prefix, label); 106 fprintf(f, "_%s_%s:\n", prefix, label); 107 } 108 109 static void emit_offset_label(FILE *f, const char *label, int offset) 110 { 111 fprintf(f, "\t.globl\t%s\n", label); 112 fprintf(f, "%s\t= . + %d\n", label, offset); 113 } 114 115 #define ASM_EMIT_BELONG(f, fmt, ...) \ 116 { \ 117 fprintf((f), "\t.byte\t((" fmt ") >> 24) & 0xff\n", __VA_ARGS__); \ 118 fprintf((f), "\t.byte\t((" fmt ") >> 16) & 0xff\n", __VA_ARGS__); \ 119 fprintf((f), "\t.byte\t((" fmt ") >> 8) & 0xff\n", __VA_ARGS__); \ 120 fprintf((f), "\t.byte\t(" fmt ") & 0xff\n", __VA_ARGS__); \ 121 } 122 123 static void asm_emit_cell(void *e, cell_t val) 124 { 125 FILE *f = e; 126 127 fprintf(f, "\t.byte\t0x%02x\n" "\t.byte\t0x%02x\n" 128 "\t.byte\t0x%02x\n" "\t.byte\t0x%02x\n", 129 (val >> 24) & 0xff, (val >> 16) & 0xff, 130 (val >> 8) & 0xff, val & 0xff); 131 } 132 133 static void asm_emit_string(void *e, const char *str, int len) 134 { 135 FILE *f = e; 136 137 if (len != 0) 138 fprintf(f, "\t.asciz\t\"%.*s\"\n", len, str); 139 else 140 fprintf(f, "\t.asciz\t\"%s\"\n", str); 141 } 142 143 static void asm_emit_align(void *e, int a) 144 { 145 FILE *f = e; 146 147 fprintf(f, "\t.balign\t%d, 0\n", a); 148 } 149 150 static void asm_emit_data(void *e, struct data d) 151 { 152 FILE *f = e; 153 unsigned int off = 0; 154 struct marker *m = d.markers; 155 156 for_each_marker_of_type(m, LABEL) 157 emit_offset_label(f, m->ref, m->offset); 158 159 while ((d.len - off) >= sizeof(uint32_t)) { 160 asm_emit_cell(e, dtb_ld32(d.val + off)); 161 off += sizeof(uint32_t); 162 } 163 164 while ((d.len - off) >= 1) { 165 fprintf(f, "\t.byte\t0x%hhx\n", d.val[off]); 166 off += 1; 167 } 168 169 assert(off == d.len); 170 } 171 172 static void asm_emit_beginnode(void *e, struct label *labels) 173 { 174 FILE *f = e; 175 struct label *l; 176 177 for_each_label(labels, l) { 178 fprintf(f, "\t.globl\t%s\n", l->label); 179 fprintf(f, "%s:\n", l->label); 180 } 181 fprintf(f, "\t/* FDT_BEGIN_NODE */\n"); 182 asm_emit_cell(e, FDT_BEGIN_NODE); 183 } 184 185 static void asm_emit_endnode(void *e, struct label *labels) 186 { 187 FILE *f = e; 188 struct label *l; 189 190 fprintf(f, "\t/* FDT_END_NODE */\n"); 191 asm_emit_cell(e, FDT_END_NODE); 192 for_each_label(labels, l) { 193 fprintf(f, "\t.globl\t%s_end\n", l->label); 194 fprintf(f, "%s_end:\n", l->label); 195 } 196 } 197 198 static void asm_emit_property(void *e, struct label *labels) 199 { 200 FILE *f = e; 201 struct label *l; 202 203 for_each_label(labels, l) { 204 fprintf(f, "\t.globl\t%s\n", l->label); 205 fprintf(f, "%s:\n", l->label); 206 } 207 fprintf(f, "\t/* FDT_PROP */\n"); 208 asm_emit_cell(e, FDT_PROP); 209 } 210 211 static struct emitter asm_emitter = { 212 .cell = asm_emit_cell, 213 .string = asm_emit_string, 214 .align = asm_emit_align, 215 .data = asm_emit_data, 216 .beginnode = asm_emit_beginnode, 217 .endnode = asm_emit_endnode, 218 .property = asm_emit_property, 219 }; 220 221 static int stringtable_insert(struct data *d, const char *str) 222 { 223 unsigned int i; 224 225 /* FIXME: do this more efficiently? */ 226 227 for (i = 0; i < d->len; i++) { 228 if (streq(str, d->val + i)) 229 return i; 230 } 231 232 *d = data_append_data(*d, str, strlen(str)+1); 233 return i; 234 } 235 236 static void flatten_tree(struct node *tree, struct emitter *emit, 237 void *etarget, struct data *strbuf, 238 struct version_info *vi) 239 { 240 struct property *prop; 241 struct node *child; 242 bool seen_name_prop = false; 243 244 if (tree->deleted) 245 return; 246 247 emit->beginnode(etarget, tree->labels); 248 249 if (vi->flags & FTF_FULLPATH) 250 emit->string(etarget, tree->fullpath, 0); 251 else 252 emit->string(etarget, tree->name, 0); 253 254 emit->align(etarget, sizeof(cell_t)); 255 256 for_each_property(tree, prop) { 257 int nameoff; 258 259 if (streq(prop->name, "name")) 260 seen_name_prop = true; 261 262 nameoff = stringtable_insert(strbuf, prop->name); 263 264 emit->property(etarget, prop->labels); 265 emit->cell(etarget, prop->val.len); 266 emit->cell(etarget, nameoff); 267 268 if ((vi->flags & FTF_VARALIGN) && (prop->val.len >= 8)) 269 emit->align(etarget, 8); 270 271 emit->data(etarget, prop->val); 272 emit->align(etarget, sizeof(cell_t)); 273 } 274 275 if ((vi->flags & FTF_NAMEPROPS) && !seen_name_prop) { 276 emit->property(etarget, NULL); 277 emit->cell(etarget, tree->basenamelen+1); 278 emit->cell(etarget, stringtable_insert(strbuf, "name")); 279 280 if ((vi->flags & FTF_VARALIGN) && ((tree->basenamelen+1) >= 8)) 281 emit->align(etarget, 8); 282 283 emit->string(etarget, tree->name, tree->basenamelen); 284 emit->align(etarget, sizeof(cell_t)); 285 } 286 287 for_each_child(tree, child) { 288 flatten_tree(child, emit, etarget, strbuf, vi); 289 } 290 291 emit->endnode(etarget, tree->labels); 292 } 293 294 static struct data flatten_reserve_list(struct reserve_info *reservelist, 295 struct version_info *vi) 296 { 297 struct reserve_info *re; 298 struct data d = empty_data; 299 unsigned int j; 300 301 for (re = reservelist; re; re = re->next) { 302 d = data_append_re(d, re->address, re->size); 303 } 304 /* 305 * Add additional reserved slots if the user asked for them. 306 */ 307 for (j = 0; j < reservenum; j++) { 308 d = data_append_re(d, 0, 0); 309 } 310 311 return d; 312 } 313 314 static void make_fdt_header(struct fdt_header *fdt, 315 struct version_info *vi, 316 int reservesize, int dtsize, int strsize, 317 int boot_cpuid_phys) 318 { 319 int reserve_off; 320 321 reservesize += sizeof(struct fdt_reserve_entry); 322 323 memset(fdt, 0xff, sizeof(*fdt)); 324 325 fdt->magic = cpu_to_fdt32(FDT_MAGIC); 326 fdt->version = cpu_to_fdt32(vi->version); 327 fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version); 328 329 /* Reserve map should be doubleword aligned */ 330 reserve_off = ALIGN(vi->hdr_size, 8); 331 332 fdt->off_mem_rsvmap = cpu_to_fdt32(reserve_off); 333 fdt->off_dt_struct = cpu_to_fdt32(reserve_off + reservesize); 334 fdt->off_dt_strings = cpu_to_fdt32(reserve_off + reservesize 335 + dtsize); 336 fdt->totalsize = cpu_to_fdt32(reserve_off + reservesize + dtsize + strsize); 337 338 if (vi->flags & FTF_BOOTCPUID) 339 fdt->boot_cpuid_phys = cpu_to_fdt32(boot_cpuid_phys); 340 if (vi->flags & FTF_STRTABSIZE) 341 fdt->size_dt_strings = cpu_to_fdt32(strsize); 342 if (vi->flags & FTF_STRUCTSIZE) 343 fdt->size_dt_struct = cpu_to_fdt32(dtsize); 344 } 345 346 void dt_to_blob(FILE *f, struct dt_info *dti, int version) 347 { 348 struct version_info *vi = NULL; 349 unsigned int i; 350 struct data blob = empty_data; 351 struct data reservebuf = empty_data; 352 struct data dtbuf = empty_data; 353 struct data strbuf = empty_data; 354 struct fdt_header fdt; 355 int padlen = 0; 356 357 for (i = 0; i < ARRAY_SIZE(version_table); i++) { 358 if (version_table[i].version == version) 359 vi = &version_table[i]; 360 } 361 if (!vi) 362 die("Unknown device tree blob version %d\n", version); 363 364 flatten_tree(dti->dt, &bin_emitter, &dtbuf, &strbuf, vi); 365 bin_emit_cell(&dtbuf, FDT_END); 366 367 reservebuf = flatten_reserve_list(dti->reservelist, vi); 368 369 /* Make header */ 370 make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len, 371 dti->boot_cpuid_phys); 372 373 /* 374 * If the user asked for more space than is used, adjust the totalsize. 375 */ 376 if (minsize > 0) { 377 padlen = minsize - fdt32_to_cpu(fdt.totalsize); 378 if (padlen < 0) { 379 padlen = 0; 380 if (quiet < 1) 381 fprintf(stderr, 382 "Warning: blob size %"PRIu32" >= minimum size %d\n", 383 fdt32_to_cpu(fdt.totalsize), minsize); 384 } 385 } 386 387 if (padsize > 0) 388 padlen = padsize; 389 390 if (alignsize > 0) 391 padlen = ALIGN(fdt32_to_cpu(fdt.totalsize) + padlen, alignsize) 392 - fdt32_to_cpu(fdt.totalsize); 393 394 if (padlen > 0) { 395 int tsize = fdt32_to_cpu(fdt.totalsize); 396 tsize += padlen; 397 fdt.totalsize = cpu_to_fdt32(tsize); 398 } 399 400 /* 401 * Assemble the blob: start with the header, add with alignment 402 * the reserve buffer, add the reserve map terminating zeroes, 403 * the device tree itself, and finally the strings. 404 */ 405 blob = data_append_data(blob, &fdt, vi->hdr_size); 406 blob = data_append_align(blob, 8); 407 blob = data_merge(blob, reservebuf); 408 blob = data_append_zeroes(blob, sizeof(struct fdt_reserve_entry)); 409 blob = data_merge(blob, dtbuf); 410 blob = data_merge(blob, strbuf); 411 412 /* 413 * If the user asked for more space than is used, pad out the blob. 414 */ 415 if (padlen > 0) 416 blob = data_append_zeroes(blob, padlen); 417 418 if (fwrite(blob.val, blob.len, 1, f) != 1) { 419 if (ferror(f)) 420 die("Error writing device tree blob: %s\n", 421 strerror(errno)); 422 else 423 die("Short write on device tree blob\n"); 424 } 425 426 /* 427 * data_merge() frees the right-hand element so only the blob 428 * remains to be freed. 429 */ 430 data_free(blob); 431 } 432 433 static void dump_stringtable_asm(FILE *f, struct data strbuf) 434 { 435 const char *p; 436 int len; 437 438 p = strbuf.val; 439 440 while (p < (strbuf.val + strbuf.len)) { 441 len = strlen(p); 442 fprintf(f, "\t.asciz \"%s\"\n", p); 443 p += len+1; 444 } 445 } 446 447 void dt_to_asm(FILE *f, struct dt_info *dti, int version) 448 { 449 struct version_info *vi = NULL; 450 unsigned int i; 451 struct data strbuf = empty_data; 452 struct reserve_info *re; 453 const char *symprefix = "dt"; 454 455 for (i = 0; i < ARRAY_SIZE(version_table); i++) { 456 if (version_table[i].version == version) 457 vi = &version_table[i]; 458 } 459 if (!vi) 460 die("Unknown device tree blob version %d\n", version); 461 462 fprintf(f, "/* autogenerated by dtc, do not edit */\n\n"); 463 464 emit_label(f, symprefix, "blob_start"); 465 emit_label(f, symprefix, "header"); 466 fprintf(f, "\t/* magic */\n"); 467 asm_emit_cell(f, FDT_MAGIC); 468 fprintf(f, "\t/* totalsize */\n"); 469 ASM_EMIT_BELONG(f, "_%s_blob_abs_end - _%s_blob_start", 470 symprefix, symprefix); 471 fprintf(f, "\t/* off_dt_struct */\n"); 472 ASM_EMIT_BELONG(f, "_%s_struct_start - _%s_blob_start", 473 symprefix, symprefix); 474 fprintf(f, "\t/* off_dt_strings */\n"); 475 ASM_EMIT_BELONG(f, "_%s_strings_start - _%s_blob_start", 476 symprefix, symprefix); 477 fprintf(f, "\t/* off_mem_rsvmap */\n"); 478 ASM_EMIT_BELONG(f, "_%s_reserve_map - _%s_blob_start", 479 symprefix, symprefix); 480 fprintf(f, "\t/* version */\n"); 481 asm_emit_cell(f, vi->version); 482 fprintf(f, "\t/* last_comp_version */\n"); 483 asm_emit_cell(f, vi->last_comp_version); 484 485 if (vi->flags & FTF_BOOTCPUID) { 486 fprintf(f, "\t/* boot_cpuid_phys */\n"); 487 asm_emit_cell(f, dti->boot_cpuid_phys); 488 } 489 490 if (vi->flags & FTF_STRTABSIZE) { 491 fprintf(f, "\t/* size_dt_strings */\n"); 492 ASM_EMIT_BELONG(f, "_%s_strings_end - _%s_strings_start", 493 symprefix, symprefix); 494 } 495 496 if (vi->flags & FTF_STRUCTSIZE) { 497 fprintf(f, "\t/* size_dt_struct */\n"); 498 ASM_EMIT_BELONG(f, "_%s_struct_end - _%s_struct_start", 499 symprefix, symprefix); 500 } 501 502 /* 503 * Reserve map entries. 504 * Align the reserve map to a doubleword boundary. 505 * Each entry is an (address, size) pair of u64 values. 506 * Always supply a zero-sized temination entry. 507 */ 508 asm_emit_align(f, 8); 509 emit_label(f, symprefix, "reserve_map"); 510 511 fprintf(f, "/* Memory reserve map from source file */\n"); 512 513 /* 514 * Use .long on high and low halves of u64s to avoid .quad 515 * as it appears .quad isn't available in some assemblers. 516 */ 517 for (re = dti->reservelist; re; re = re->next) { 518 struct label *l; 519 520 for_each_label(re->labels, l) { 521 fprintf(f, "\t.globl\t%s\n", l->label); 522 fprintf(f, "%s:\n", l->label); 523 } 524 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->address >> 32)); 525 ASM_EMIT_BELONG(f, "0x%08x", 526 (unsigned int)(re->address & 0xffffffff)); 527 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->size >> 32)); 528 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->size & 0xffffffff)); 529 } 530 for (i = 0; i < reservenum; i++) { 531 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); 532 } 533 534 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); 535 536 emit_label(f, symprefix, "struct_start"); 537 flatten_tree(dti->dt, &asm_emitter, f, &strbuf, vi); 538 539 fprintf(f, "\t/* FDT_END */\n"); 540 asm_emit_cell(f, FDT_END); 541 emit_label(f, symprefix, "struct_end"); 542 543 emit_label(f, symprefix, "strings_start"); 544 dump_stringtable_asm(f, strbuf); 545 emit_label(f, symprefix, "strings_end"); 546 547 emit_label(f, symprefix, "blob_end"); 548 549 /* 550 * If the user asked for more space than is used, pad it out. 551 */ 552 if (minsize > 0) { 553 fprintf(f, "\t.space\t%d - (_%s_blob_end - _%s_blob_start), 0\n", 554 minsize, symprefix, symprefix); 555 } 556 if (padsize > 0) { 557 fprintf(f, "\t.space\t%d, 0\n", padsize); 558 } 559 if (alignsize > 0) 560 asm_emit_align(f, alignsize); 561 emit_label(f, symprefix, "blob_abs_end"); 562 563 data_free(strbuf); 564 } 565 566 struct inbuf { 567 char *base, *limit, *ptr; 568 }; 569 570 static void inbuf_init(struct inbuf *inb, void *base, void *limit) 571 { 572 inb->base = base; 573 inb->limit = limit; 574 inb->ptr = inb->base; 575 } 576 577 static void flat_read_chunk(struct inbuf *inb, void *p, int len) 578 { 579 if ((inb->ptr + len) > inb->limit) 580 die("Premature end of data parsing flat device tree\n"); 581 582 memcpy(p, inb->ptr, len); 583 584 inb->ptr += len; 585 } 586 587 static uint32_t flat_read_word(struct inbuf *inb) 588 { 589 fdt32_t val; 590 591 assert(((inb->ptr - inb->base) % sizeof(val)) == 0); 592 593 flat_read_chunk(inb, &val, sizeof(val)); 594 595 return fdt32_to_cpu(val); 596 } 597 598 static void flat_realign(struct inbuf *inb, int align) 599 { 600 int off = inb->ptr - inb->base; 601 602 inb->ptr = inb->base + ALIGN(off, align); 603 if (inb->ptr > inb->limit) 604 die("Premature end of data parsing flat device tree\n"); 605 } 606 607 static char *flat_read_string(struct inbuf *inb) 608 { 609 int len = 0; 610 const char *p = inb->ptr; 611 char *str; 612 613 do { 614 if (p >= inb->limit) 615 die("Premature end of data parsing flat device tree\n"); 616 len++; 617 } while ((*p++) != '\0'); 618 619 str = xstrdup(inb->ptr); 620 621 inb->ptr += len; 622 623 flat_realign(inb, sizeof(uint32_t)); 624 625 return str; 626 } 627 628 static struct data flat_read_data(struct inbuf *inb, int len) 629 { 630 struct data d = empty_data; 631 632 if (len == 0) 633 return empty_data; 634 635 d = data_grow_for(d, len); 636 d.len = len; 637 638 flat_read_chunk(inb, d.val, len); 639 640 flat_realign(inb, sizeof(uint32_t)); 641 642 return d; 643 } 644 645 static char *flat_read_stringtable(struct inbuf *inb, int offset) 646 { 647 const char *p; 648 649 p = inb->base + offset; 650 while (1) { 651 if (p >= inb->limit || p < inb->base) 652 die("String offset %d overruns string table\n", 653 offset); 654 655 if (*p == '\0') 656 break; 657 658 p++; 659 } 660 661 return xstrdup(inb->base + offset); 662 } 663 664 static struct property *flat_read_property(struct inbuf *dtbuf, 665 struct inbuf *strbuf, int flags) 666 { 667 uint32_t proplen, stroff; 668 char *name; 669 struct data val; 670 671 proplen = flat_read_word(dtbuf); 672 stroff = flat_read_word(dtbuf); 673 674 name = flat_read_stringtable(strbuf, stroff); 675 676 if ((flags & FTF_VARALIGN) && (proplen >= 8)) 677 flat_realign(dtbuf, 8); 678 679 val = flat_read_data(dtbuf, proplen); 680 681 return build_property(name, val, NULL); 682 } 683 684 685 static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb) 686 { 687 struct reserve_info *reservelist = NULL; 688 struct reserve_info *new; 689 struct fdt_reserve_entry re; 690 691 /* 692 * Each entry is a pair of u64 (addr, size) values for 4 cell_t's. 693 * List terminates at an entry with size equal to zero. 694 * 695 * First pass, count entries. 696 */ 697 while (1) { 698 uint64_t address, size; 699 700 flat_read_chunk(inb, &re, sizeof(re)); 701 address = fdt64_to_cpu(re.address); 702 size = fdt64_to_cpu(re.size); 703 if (size == 0) 704 break; 705 706 new = build_reserve_entry(address, size); 707 reservelist = add_reserve_entry(reservelist, new); 708 } 709 710 return reservelist; 711 } 712 713 714 static char *nodename_from_path(const char *ppath, const char *cpath) 715 { 716 int plen; 717 718 plen = strlen(ppath); 719 720 if (!strstarts(cpath, ppath)) 721 die("Path \"%s\" is not valid as a child of \"%s\"\n", 722 cpath, ppath); 723 724 /* root node is a special case */ 725 if (!streq(ppath, "/")) 726 plen++; 727 728 return xstrdup(cpath + plen); 729 } 730 731 static struct node *unflatten_tree(struct inbuf *dtbuf, 732 struct inbuf *strbuf, 733 const char *parent_flatname, int flags) 734 { 735 struct node *node; 736 char *flatname; 737 uint32_t val; 738 739 node = build_node(NULL, NULL, NULL); 740 741 flatname = flat_read_string(dtbuf); 742 743 if (flags & FTF_FULLPATH) 744 node->name = nodename_from_path(parent_flatname, flatname); 745 else 746 node->name = flatname; 747 748 do { 749 struct property *prop; 750 struct node *child; 751 752 val = flat_read_word(dtbuf); 753 switch (val) { 754 case FDT_PROP: 755 if (node->children) 756 fprintf(stderr, "Warning: Flat tree input has " 757 "subnodes preceding a property.\n"); 758 prop = flat_read_property(dtbuf, strbuf, flags); 759 add_property(node, prop); 760 break; 761 762 case FDT_BEGIN_NODE: 763 child = unflatten_tree(dtbuf,strbuf, flatname, flags); 764 add_child(node, child); 765 break; 766 767 case FDT_END_NODE: 768 break; 769 770 case FDT_END: 771 die("Premature FDT_END in device tree blob\n"); 772 break; 773 774 case FDT_NOP: 775 if (!(flags & FTF_NOPS)) 776 fprintf(stderr, "Warning: NOP tag found in flat tree" 777 " version <16\n"); 778 779 /* Ignore */ 780 break; 781 782 default: 783 die("Invalid opcode word %08x in device tree blob\n", 784 val); 785 } 786 } while (val != FDT_END_NODE); 787 788 if (node->name != flatname) { 789 free(flatname); 790 } 791 792 return node; 793 } 794 795 796 struct dt_info *dt_from_blob(const char *fname) 797 { 798 FILE *f; 799 fdt32_t magic_buf, totalsize_buf; 800 uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys; 801 uint32_t off_dt, off_str, off_mem_rsvmap; 802 int rc; 803 char *blob; 804 struct fdt_header *fdt; 805 char *p; 806 struct inbuf dtbuf, strbuf; 807 struct inbuf memresvbuf; 808 int sizeleft; 809 struct reserve_info *reservelist; 810 struct node *tree; 811 uint32_t val; 812 int flags = 0; 813 814 f = srcfile_relative_open(fname, NULL); 815 816 rc = fread(&magic_buf, sizeof(magic_buf), 1, f); 817 if (ferror(f)) 818 die("Error reading DT blob magic number: %s\n", 819 strerror(errno)); 820 if (rc < 1) { 821 if (feof(f)) 822 die("EOF reading DT blob magic number\n"); 823 else 824 die("Mysterious short read reading magic number\n"); 825 } 826 827 magic = fdt32_to_cpu(magic_buf); 828 if (magic != FDT_MAGIC) 829 die("Blob has incorrect magic number\n"); 830 831 rc = fread(&totalsize_buf, sizeof(totalsize_buf), 1, f); 832 if (ferror(f)) 833 die("Error reading DT blob size: %s\n", strerror(errno)); 834 if (rc < 1) { 835 if (feof(f)) 836 die("EOF reading DT blob size\n"); 837 else 838 die("Mysterious short read reading blob size\n"); 839 } 840 841 totalsize = fdt32_to_cpu(totalsize_buf); 842 if (totalsize < FDT_V1_SIZE) 843 die("DT blob size (%d) is too small\n", totalsize); 844 845 blob = xmalloc(totalsize); 846 847 fdt = (struct fdt_header *)blob; 848 fdt->magic = cpu_to_fdt32(magic); 849 fdt->totalsize = cpu_to_fdt32(totalsize); 850 851 sizeleft = totalsize - sizeof(magic) - sizeof(totalsize); 852 p = blob + sizeof(magic) + sizeof(totalsize); 853 854 while (sizeleft) { 855 if (feof(f)) 856 die("EOF before reading %d bytes of DT blob\n", 857 totalsize); 858 859 rc = fread(p, 1, sizeleft, f); 860 if (ferror(f)) 861 die("Error reading DT blob: %s\n", 862 strerror(errno)); 863 864 sizeleft -= rc; 865 p += rc; 866 } 867 868 off_dt = fdt32_to_cpu(fdt->off_dt_struct); 869 off_str = fdt32_to_cpu(fdt->off_dt_strings); 870 off_mem_rsvmap = fdt32_to_cpu(fdt->off_mem_rsvmap); 871 version = fdt32_to_cpu(fdt->version); 872 boot_cpuid_phys = fdt32_to_cpu(fdt->boot_cpuid_phys); 873 874 if (off_mem_rsvmap >= totalsize) 875 die("Mem Reserve structure offset exceeds total size\n"); 876 877 if (off_dt >= totalsize) 878 die("DT structure offset exceeds total size\n"); 879 880 if (off_str > totalsize) 881 die("String table offset exceeds total size\n"); 882 883 if (version >= 3) { 884 uint32_t size_str = fdt32_to_cpu(fdt->size_dt_strings); 885 if ((off_str+size_str < off_str) || (off_str+size_str > totalsize)) 886 die("String table extends past total size\n"); 887 inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str); 888 } else { 889 inbuf_init(&strbuf, blob + off_str, blob + totalsize); 890 } 891 892 if (version >= 17) { 893 size_dt = fdt32_to_cpu(fdt->size_dt_struct); 894 if ((off_dt+size_dt < off_dt) || (off_dt+size_dt > totalsize)) 895 die("Structure block extends past total size\n"); 896 } 897 898 if (version < 16) { 899 flags |= FTF_FULLPATH | FTF_NAMEPROPS | FTF_VARALIGN; 900 } else { 901 flags |= FTF_NOPS; 902 } 903 904 inbuf_init(&memresvbuf, 905 blob + off_mem_rsvmap, blob + totalsize); 906 inbuf_init(&dtbuf, blob + off_dt, blob + totalsize); 907 908 reservelist = flat_read_mem_reserve(&memresvbuf); 909 910 val = flat_read_word(&dtbuf); 911 912 if (val != FDT_BEGIN_NODE) 913 die("Device tree blob doesn't begin with FDT_BEGIN_NODE (begins with 0x%08x)\n", val); 914 915 tree = unflatten_tree(&dtbuf, &strbuf, "", flags); 916 917 val = flat_read_word(&dtbuf); 918 if (val != FDT_END) 919 die("Device tree blob doesn't end with FDT_END\n"); 920 921 free(blob); 922 923 fclose(f); 924 925 return build_dt_info(DTSF_V1, reservelist, tree, boot_cpuid_phys); 926 } 927