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 32 static 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 50 struct 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 60 static 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 67 static 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 78 static void bin_emit_align(void *e, int a) 79 { 80 struct data *dtbuf = e; 81 82 *dtbuf = data_append_align(*dtbuf, a); 83 } 84 85 static 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 92 static void bin_emit_beginnode(void *e, struct label *labels) 93 { 94 bin_emit_cell(e, FDT_BEGIN_NODE); 95 } 96 97 static void bin_emit_endnode(void *e, struct label *labels) 98 { 99 bin_emit_cell(e, FDT_END_NODE); 100 } 101 102 static void bin_emit_property(void *e, struct label *labels) 103 { 104 bin_emit_cell(e, FDT_PROP); 105 } 106 107 static 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 }; 116 117 static 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 } 123 124 static 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 } 137 138 static 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 } 146 147 static 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 } 164 165 static 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 } 171 172 static 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 } 193 194 static 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 } 206 207 static 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 } 219 220 static 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 } 232 233 static 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 }; 242 243 static 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 } 257 258 static 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 int seen_name_prop = 0; 265 266 emit->beginnode(etarget, tree->labels); 267 268 if (vi->flags & FTF_FULLPATH) 269 emit->string(etarget, tree->fullpath, 0); 270 else 271 emit->string(etarget, tree->name, 0); 272 273 emit->align(etarget, sizeof(cell_t)); 274 275 for_each_property(tree, prop) { 276 int nameoff; 277 278 if (streq(prop->name, "name")) 279 seen_name_prop = 1; 280 281 nameoff = stringtable_insert(strbuf, prop->name); 282 283 emit->property(etarget, prop->labels); 284 emit->cell(etarget, prop->val.len); 285 emit->cell(etarget, nameoff); 286 287 if ((vi->flags & FTF_VARALIGN) && (prop->val.len >= 8)) 288 emit->align(etarget, 8); 289 290 emit->data(etarget, prop->val); 291 emit->align(etarget, sizeof(cell_t)); 292 } 293 294 if ((vi->flags & FTF_NAMEPROPS) && !seen_name_prop) { 295 emit->property(etarget, NULL); 296 emit->cell(etarget, tree->basenamelen+1); 297 emit->cell(etarget, stringtable_insert(strbuf, "name")); 298 299 if ((vi->flags & FTF_VARALIGN) && ((tree->basenamelen+1) >= 8)) 300 emit->align(etarget, 8); 301 302 emit->string(etarget, tree->name, tree->basenamelen); 303 emit->align(etarget, sizeof(cell_t)); 304 } 305 306 for_each_child(tree, child) { 307 flatten_tree(child, emit, etarget, strbuf, vi); 308 } 309 310 emit->endnode(etarget, tree->labels); 311 } 312 313 static struct data flatten_reserve_list(struct reserve_info *reservelist, 314 struct version_info *vi) 315 { 316 struct reserve_info *re; 317 struct data d = empty_data; 318 static struct fdt_reserve_entry null_re = {0,0}; 319 int j; 320 321 for (re = reservelist; re; re = re->next) { 322 d = data_append_re(d, &re->re); 323 } 324 /* 325 * Add additional reserved slots if the user asked for them. 326 */ 327 for (j = 0; j < reservenum; j++) { 328 d = data_append_re(d, &null_re); 329 } 330 331 return d; 332 } 333 334 static void make_fdt_header(struct fdt_header *fdt, 335 struct version_info *vi, 336 int reservesize, int dtsize, int strsize, 337 int boot_cpuid_phys) 338 { 339 int reserve_off; 340 341 reservesize += sizeof(struct fdt_reserve_entry); 342 343 memset(fdt, 0xff, sizeof(*fdt)); 344 345 fdt->magic = cpu_to_fdt32(FDT_MAGIC); 346 fdt->version = cpu_to_fdt32(vi->version); 347 fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version); 348 349 /* Reserve map should be doubleword aligned */ 350 reserve_off = ALIGN(vi->hdr_size, 8); 351 352 fdt->off_mem_rsvmap = cpu_to_fdt32(reserve_off); 353 fdt->off_dt_struct = cpu_to_fdt32(reserve_off + reservesize); 354 fdt->off_dt_strings = cpu_to_fdt32(reserve_off + reservesize 355 + dtsize); 356 fdt->totalsize = cpu_to_fdt32(reserve_off + reservesize + dtsize + strsize); 357 358 if (vi->flags & FTF_BOOTCPUID) 359 fdt->boot_cpuid_phys = cpu_to_fdt32(boot_cpuid_phys); 360 if (vi->flags & FTF_STRTABSIZE) 361 fdt->size_dt_strings = cpu_to_fdt32(strsize); 362 if (vi->flags & FTF_STRUCTSIZE) 363 fdt->size_dt_struct = cpu_to_fdt32(dtsize); 364 } 365 366 void dt_to_blob(FILE *f, struct boot_info *bi, int version) 367 { 368 struct version_info *vi = NULL; 369 int i; 370 struct data blob = empty_data; 371 struct data reservebuf = empty_data; 372 struct data dtbuf = empty_data; 373 struct data strbuf = empty_data; 374 struct fdt_header fdt; 375 int padlen = 0; 376 377 for (i = 0; i < ARRAY_SIZE(version_table); i++) { 378 if (version_table[i].version == version) 379 vi = &version_table[i]; 380 } 381 if (!vi) 382 die("Unknown device tree blob version %d\n", version); 383 384 flatten_tree(bi->dt, &bin_emitter, &dtbuf, &strbuf, vi); 385 bin_emit_cell(&dtbuf, FDT_END); 386 387 reservebuf = flatten_reserve_list(bi->reservelist, vi); 388 389 /* Make header */ 390 make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len, 391 bi->boot_cpuid_phys); 392 393 /* 394 * If the user asked for more space than is used, adjust the totalsize. 395 */ 396 if (minsize > 0) { 397 padlen = minsize - fdt32_to_cpu(fdt.totalsize); 398 if ((padlen < 0) && (quiet < 1)) 399 fprintf(stderr, 400 "Warning: blob size %d >= minimum size %d\n", 401 fdt32_to_cpu(fdt.totalsize), minsize); 402 } 403 404 if (padsize > 0) 405 padlen = padsize; 406 407 if (padlen > 0) { 408 int tsize = fdt32_to_cpu(fdt.totalsize); 409 tsize += padlen; 410 fdt.totalsize = cpu_to_fdt32(tsize); 411 } 412 413 /* 414 * Assemble the blob: start with the header, add with alignment 415 * the reserve buffer, add the reserve map terminating zeroes, 416 * the device tree itself, and finally the strings. 417 */ 418 blob = data_append_data(blob, &fdt, vi->hdr_size); 419 blob = data_append_align(blob, 8); 420 blob = data_merge(blob, reservebuf); 421 blob = data_append_zeroes(blob, sizeof(struct fdt_reserve_entry)); 422 blob = data_merge(blob, dtbuf); 423 blob = data_merge(blob, strbuf); 424 425 /* 426 * If the user asked for more space than is used, pad out the blob. 427 */ 428 if (padlen > 0) 429 blob = data_append_zeroes(blob, padlen); 430 431 if (fwrite(blob.val, blob.len, 1, f) != 1) { 432 if (ferror(f)) 433 die("Error writing device tree blob: %s\n", 434 strerror(errno)); 435 else 436 die("Short write on device tree blob\n"); 437 } 438 439 /* 440 * data_merge() frees the right-hand element so only the blob 441 * remains to be freed. 442 */ 443 data_free(blob); 444 } 445 446 static void dump_stringtable_asm(FILE *f, struct data strbuf) 447 { 448 const char *p; 449 int len; 450 451 p = strbuf.val; 452 453 while (p < (strbuf.val + strbuf.len)) { 454 len = strlen(p); 455 fprintf(f, "\t.string \"%s\"\n", p); 456 p += len+1; 457 } 458 } 459 460 void dt_to_asm(FILE *f, struct boot_info *bi, int version) 461 { 462 struct version_info *vi = NULL; 463 int i; 464 struct data strbuf = empty_data; 465 struct reserve_info *re; 466 const char *symprefix = "dt"; 467 468 for (i = 0; i < ARRAY_SIZE(version_table); i++) { 469 if (version_table[i].version == version) 470 vi = &version_table[i]; 471 } 472 if (!vi) 473 die("Unknown device tree blob version %d\n", version); 474 475 fprintf(f, "/* autogenerated by dtc, do not edit */\n\n"); 476 477 emit_label(f, symprefix, "blob_start"); 478 emit_label(f, symprefix, "header"); 479 fprintf(f, "\t/* magic */\n"); 480 asm_emit_cell(f, FDT_MAGIC); 481 fprintf(f, "\t/* totalsize */\n"); 482 ASM_EMIT_BELONG(f, "_%s_blob_abs_end - _%s_blob_start", 483 symprefix, symprefix); 484 fprintf(f, "\t/* off_dt_struct */\n"); 485 ASM_EMIT_BELONG(f, "_%s_struct_start - _%s_blob_start", 486 symprefix, symprefix); 487 fprintf(f, "\t/* off_dt_strings */\n"); 488 ASM_EMIT_BELONG(f, "_%s_strings_start - _%s_blob_start", 489 symprefix, symprefix); 490 fprintf(f, "\t/* off_mem_rsvmap */\n"); 491 ASM_EMIT_BELONG(f, "_%s_reserve_map - _%s_blob_start", 492 symprefix, symprefix); 493 fprintf(f, "\t/* version */\n"); 494 asm_emit_cell(f, vi->version); 495 fprintf(f, "\t/* last_comp_version */\n"); 496 asm_emit_cell(f, vi->last_comp_version); 497 498 if (vi->flags & FTF_BOOTCPUID) { 499 fprintf(f, "\t/* boot_cpuid_phys */\n"); 500 asm_emit_cell(f, bi->boot_cpuid_phys); 501 } 502 503 if (vi->flags & FTF_STRTABSIZE) { 504 fprintf(f, "\t/* size_dt_strings */\n"); 505 ASM_EMIT_BELONG(f, "_%s_strings_end - _%s_strings_start", 506 symprefix, symprefix); 507 } 508 509 if (vi->flags & FTF_STRUCTSIZE) { 510 fprintf(f, "\t/* size_dt_struct */\n"); 511 ASM_EMIT_BELONG(f, "_%s_struct_end - _%s_struct_start", 512 symprefix, symprefix); 513 } 514 515 /* 516 * Reserve map entries. 517 * Align the reserve map to a doubleword boundary. 518 * Each entry is an (address, size) pair of u64 values. 519 * Always supply a zero-sized temination entry. 520 */ 521 asm_emit_align(f, 8); 522 emit_label(f, symprefix, "reserve_map"); 523 524 fprintf(f, "/* Memory reserve map from source file */\n"); 525 526 /* 527 * Use .long on high and low halfs of u64s to avoid .quad 528 * as it appears .quad isn't available in some assemblers. 529 */ 530 for (re = bi->reservelist; re; re = re->next) { 531 struct label *l; 532 533 for_each_label(re->labels, l) { 534 fprintf(f, "\t.globl\t%s\n", l->label); 535 fprintf(f, "%s:\n", l->label); 536 } 537 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.address >> 32)); 538 ASM_EMIT_BELONG(f, "0x%08x", 539 (unsigned int)(re->re.address & 0xffffffff)); 540 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size >> 32)); 541 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size & 0xffffffff)); 542 } 543 for (i = 0; i < reservenum; i++) { 544 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); 545 } 546 547 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); 548 549 emit_label(f, symprefix, "struct_start"); 550 flatten_tree(bi->dt, &asm_emitter, f, &strbuf, vi); 551 552 fprintf(f, "\t/* FDT_END */\n"); 553 asm_emit_cell(f, FDT_END); 554 emit_label(f, symprefix, "struct_end"); 555 556 emit_label(f, symprefix, "strings_start"); 557 dump_stringtable_asm(f, strbuf); 558 emit_label(f, symprefix, "strings_end"); 559 560 emit_label(f, symprefix, "blob_end"); 561 562 /* 563 * If the user asked for more space than is used, pad it out. 564 */ 565 if (minsize > 0) { 566 fprintf(f, "\t.space\t%d - (_%s_blob_end - _%s_blob_start), 0\n", 567 minsize, symprefix, symprefix); 568 } 569 if (padsize > 0) { 570 fprintf(f, "\t.space\t%d, 0\n", padsize); 571 } 572 emit_label(f, symprefix, "blob_abs_end"); 573 574 data_free(strbuf); 575 } 576 577 struct inbuf { 578 char *base, *limit, *ptr; 579 }; 580 581 static void inbuf_init(struct inbuf *inb, void *base, void *limit) 582 { 583 inb->base = base; 584 inb->limit = limit; 585 inb->ptr = inb->base; 586 } 587 588 static void flat_read_chunk(struct inbuf *inb, void *p, int len) 589 { 590 if ((inb->ptr + len) > inb->limit) 591 die("Premature end of data parsing flat device tree\n"); 592 593 memcpy(p, inb->ptr, len); 594 595 inb->ptr += len; 596 } 597 598 static uint32_t flat_read_word(struct inbuf *inb) 599 { 600 uint32_t val; 601 602 assert(((inb->ptr - inb->base) % sizeof(val)) == 0); 603 604 flat_read_chunk(inb, &val, sizeof(val)); 605 606 return fdt32_to_cpu(val); 607 } 608 609 static void flat_realign(struct inbuf *inb, int align) 610 { 611 int off = inb->ptr - inb->base; 612 613 inb->ptr = inb->base + ALIGN(off, align); 614 if (inb->ptr > inb->limit) 615 die("Premature end of data parsing flat device tree\n"); 616 } 617 618 static char *flat_read_string(struct inbuf *inb) 619 { 620 int len = 0; 621 const char *p = inb->ptr; 622 char *str; 623 624 do { 625 if (p >= inb->limit) 626 die("Premature end of data parsing flat device tree\n"); 627 len++; 628 } while ((*p++) != '\0'); 629 630 str = xstrdup(inb->ptr); 631 632 inb->ptr += len; 633 634 flat_realign(inb, sizeof(uint32_t)); 635 636 return str; 637 } 638 639 static struct data flat_read_data(struct inbuf *inb, int len) 640 { 641 struct data d = empty_data; 642 643 if (len == 0) 644 return empty_data; 645 646 d = data_grow_for(d, len); 647 d.len = len; 648 649 flat_read_chunk(inb, d.val, len); 650 651 flat_realign(inb, sizeof(uint32_t)); 652 653 return d; 654 } 655 656 static char *flat_read_stringtable(struct inbuf *inb, int offset) 657 { 658 const char *p; 659 660 p = inb->base + offset; 661 while (1) { 662 if (p >= inb->limit || p < inb->base) 663 die("String offset %d overruns string table\n", 664 offset); 665 666 if (*p == '\0') 667 break; 668 669 p++; 670 } 671 672 return xstrdup(inb->base + offset); 673 } 674 675 static struct property *flat_read_property(struct inbuf *dtbuf, 676 struct inbuf *strbuf, int flags) 677 { 678 uint32_t proplen, stroff; 679 char *name; 680 struct data val; 681 682 proplen = flat_read_word(dtbuf); 683 stroff = flat_read_word(dtbuf); 684 685 name = flat_read_stringtable(strbuf, stroff); 686 687 if ((flags & FTF_VARALIGN) && (proplen >= 8)) 688 flat_realign(dtbuf, 8); 689 690 val = flat_read_data(dtbuf, proplen); 691 692 return build_property(name, val); 693 } 694 695 696 static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb) 697 { 698 struct reserve_info *reservelist = NULL; 699 struct reserve_info *new; 700 struct fdt_reserve_entry re; 701 702 /* 703 * Each entry is a pair of u64 (addr, size) values for 4 cell_t's. 704 * List terminates at an entry with size equal to zero. 705 * 706 * First pass, count entries. 707 */ 708 while (1) { 709 flat_read_chunk(inb, &re, sizeof(re)); 710 re.address = fdt64_to_cpu(re.address); 711 re.size = fdt64_to_cpu(re.size); 712 if (re.size == 0) 713 break; 714 715 new = build_reserve_entry(re.address, re.size); 716 reservelist = add_reserve_entry(reservelist, new); 717 } 718 719 return reservelist; 720 } 721 722 723 static char *nodename_from_path(const char *ppath, const char *cpath) 724 { 725 int plen; 726 727 plen = strlen(ppath); 728 729 if (!strneq(ppath, cpath, plen)) 730 die("Path \"%s\" is not valid as a child of \"%s\"\n", 731 cpath, ppath); 732 733 /* root node is a special case */ 734 if (!streq(ppath, "/")) 735 plen++; 736 737 return xstrdup(cpath + plen); 738 } 739 740 static struct node *unflatten_tree(struct inbuf *dtbuf, 741 struct inbuf *strbuf, 742 const char *parent_flatname, int flags) 743 { 744 struct node *node; 745 char *flatname; 746 uint32_t val; 747 748 node = build_node(NULL, NULL); 749 750 flatname = flat_read_string(dtbuf); 751 752 if (flags & FTF_FULLPATH) 753 node->name = nodename_from_path(parent_flatname, flatname); 754 else 755 node->name = flatname; 756 757 do { 758 struct property *prop; 759 struct node *child; 760 761 val = flat_read_word(dtbuf); 762 switch (val) { 763 case FDT_PROP: 764 if (node->children) 765 fprintf(stderr, "Warning: Flat tree input has " 766 "subnodes preceding a property.\n"); 767 prop = flat_read_property(dtbuf, strbuf, flags); 768 add_property(node, prop); 769 break; 770 771 case FDT_BEGIN_NODE: 772 child = unflatten_tree(dtbuf,strbuf, flatname, flags); 773 add_child(node, child); 774 break; 775 776 case FDT_END_NODE: 777 break; 778 779 case FDT_END: 780 die("Premature FDT_END in device tree blob\n"); 781 break; 782 783 case FDT_NOP: 784 if (!(flags & FTF_NOPS)) 785 fprintf(stderr, "Warning: NOP tag found in flat tree" 786 " version <16\n"); 787 788 /* Ignore */ 789 break; 790 791 default: 792 die("Invalid opcode word %08x in device tree blob\n", 793 val); 794 } 795 } while (val != FDT_END_NODE); 796 797 return node; 798 } 799 800 801 struct boot_info *dt_from_blob(const char *fname) 802 { 803 FILE *f; 804 uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys; 805 uint32_t off_dt, off_str, off_mem_rsvmap; 806 int rc; 807 char *blob; 808 struct fdt_header *fdt; 809 char *p; 810 struct inbuf dtbuf, strbuf; 811 struct inbuf memresvbuf; 812 int sizeleft; 813 struct reserve_info *reservelist; 814 struct node *tree; 815 uint32_t val; 816 int flags = 0; 817 818 f = srcfile_relative_open(fname, NULL); 819 820 rc = fread(&magic, sizeof(magic), 1, f); 821 if (ferror(f)) 822 die("Error reading DT blob magic number: %s\n", 823 strerror(errno)); 824 if (rc < 1) { 825 if (feof(f)) 826 die("EOF reading DT blob magic number\n"); 827 else 828 die("Mysterious short read reading magic number\n"); 829 } 830 831 magic = fdt32_to_cpu(magic); 832 if (magic != FDT_MAGIC) 833 die("Blob has incorrect magic number\n"); 834 835 rc = fread(&totalsize, sizeof(totalsize), 1, f); 836 if (ferror(f)) 837 die("Error reading DT blob size: %s\n", strerror(errno)); 838 if (rc < 1) { 839 if (feof(f)) 840 die("EOF reading DT blob size\n"); 841 else 842 die("Mysterious short read reading blob size\n"); 843 } 844 845 totalsize = fdt32_to_cpu(totalsize); 846 if (totalsize < FDT_V1_SIZE) 847 die("DT blob size (%d) is too small\n", totalsize); 848 849 blob = xmalloc(totalsize); 850 851 fdt = (struct fdt_header *)blob; 852 fdt->magic = cpu_to_fdt32(magic); 853 fdt->totalsize = cpu_to_fdt32(totalsize); 854 855 sizeleft = totalsize - sizeof(magic) - sizeof(totalsize); 856 p = blob + sizeof(magic) + sizeof(totalsize); 857 858 while (sizeleft) { 859 if (feof(f)) 860 die("EOF before reading %d bytes of DT blob\n", 861 totalsize); 862 863 rc = fread(p, 1, sizeleft, f); 864 if (ferror(f)) 865 die("Error reading DT blob: %s\n", 866 strerror(errno)); 867 868 sizeleft -= rc; 869 p += rc; 870 } 871 872 off_dt = fdt32_to_cpu(fdt->off_dt_struct); 873 off_str = fdt32_to_cpu(fdt->off_dt_strings); 874 off_mem_rsvmap = fdt32_to_cpu(fdt->off_mem_rsvmap); 875 version = fdt32_to_cpu(fdt->version); 876 boot_cpuid_phys = fdt32_to_cpu(fdt->boot_cpuid_phys); 877 878 if (off_mem_rsvmap >= totalsize) 879 die("Mem Reserve structure offset exceeds total size\n"); 880 881 if (off_dt >= totalsize) 882 die("DT structure offset exceeds total size\n"); 883 884 if (off_str > totalsize) 885 die("String table offset exceeds total size\n"); 886 887 if (version >= 3) { 888 uint32_t size_str = fdt32_to_cpu(fdt->size_dt_strings); 889 if (off_str+size_str > totalsize) 890 die("String table extends past total size\n"); 891 inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str); 892 } else { 893 inbuf_init(&strbuf, blob + off_str, blob + totalsize); 894 } 895 896 if (version >= 17) { 897 size_dt = fdt32_to_cpu(fdt->size_dt_struct); 898 if (off_dt+size_dt > totalsize) 899 die("Structure block extends past total size\n"); 900 } 901 902 if (version < 16) { 903 flags |= FTF_FULLPATH | FTF_NAMEPROPS | FTF_VARALIGN; 904 } else { 905 flags |= FTF_NOPS; 906 } 907 908 inbuf_init(&memresvbuf, 909 blob + off_mem_rsvmap, blob + totalsize); 910 inbuf_init(&dtbuf, blob + off_dt, blob + totalsize); 911 912 reservelist = flat_read_mem_reserve(&memresvbuf); 913 914 val = flat_read_word(&dtbuf); 915 916 if (val != FDT_BEGIN_NODE) 917 die("Device tree blob doesn't begin with FDT_BEGIN_NODE (begins with 0x%08x)\n", val); 918 919 tree = unflatten_tree(&dtbuf, &strbuf, "", flags); 920 921 val = flat_read_word(&dtbuf); 922 if (val != FDT_END) 923 die("Device tree blob doesn't end with FDT_END\n"); 924 925 free(blob); 926 927 fclose(f); 928 929 return build_boot_info(reservelist, tree, boot_cpuid_phys); 930 } 931