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