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 *, 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        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
 313static 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
 334static 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
 366void 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
 446static 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
 460void 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
 577struct inbuf {
 578        char *base, *limit, *ptr;
 579};
 580
 581static 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
 588static 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
 598static 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
 609static 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
 618static 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
 639static 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
 656static 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
 675static 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
 696static 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
 723static 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
 740static 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
 801struct 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
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