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flattree.c

/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *                                                                   USA
 */

#include "dtc.h"
#include "srcpos.h"

#define FTF_FULLPATH    0x1
#define FTF_VARALIGN    0x2
#define FTF_NAMEPROPS   0x4
#define FTF_BOOTCPUID   0x8
#define FTF_STRTABSIZE  0x10
#define FTF_STRUCTSIZE  0x20
#define FTF_NOPS  0x40

static struct version_info {
      int version;
      int last_comp_version;
      int hdr_size;
      int flags;
} version_table[] = {
      {1, 1, FDT_V1_SIZE,
       FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS},
      {2, 1, FDT_V2_SIZE,
       FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID},
      {3, 1, FDT_V3_SIZE,
       FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID|FTF_STRTABSIZE},
      {16, 16, FDT_V3_SIZE,
       FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_NOPS},
      {17, 16, FDT_V17_SIZE,
       FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_STRUCTSIZE|FTF_NOPS},
};

struct emitter {
      void (*cell)(void *, cell_t);
      void (*string)(void *, char *, int);
      void (*align)(void *, int);
      void (*data)(void *, struct data);
      void (*beginnode)(void *, const char *);
      void (*endnode)(void *, const char *);
      void (*property)(void *, const char *);
};

static void bin_emit_cell(void *e, cell_t val)
{
      struct data *dtbuf = e;

      *dtbuf = data_append_cell(*dtbuf, val);
}

static void bin_emit_string(void *e, char *str, int len)
{
      struct data *dtbuf = e;

      if (len == 0)
            len = strlen(str);

      *dtbuf = data_append_data(*dtbuf, str, len);
      *dtbuf = data_append_byte(*dtbuf, '\0');
}

static void bin_emit_align(void *e, int a)
{
      struct data *dtbuf = e;

      *dtbuf = data_append_align(*dtbuf, a);
}

static void bin_emit_data(void *e, struct data d)
{
      struct data *dtbuf = e;

      *dtbuf = data_append_data(*dtbuf, d.val, d.len);
}

static void bin_emit_beginnode(void *e, const char *label)
{
      bin_emit_cell(e, FDT_BEGIN_NODE);
}

static void bin_emit_endnode(void *e, const char *label)
{
      bin_emit_cell(e, FDT_END_NODE);
}

static void bin_emit_property(void *e, const char *label)
{
      bin_emit_cell(e, FDT_PROP);
}

static struct emitter bin_emitter = {
      .cell = bin_emit_cell,
      .string = bin_emit_string,
      .align = bin_emit_align,
      .data = bin_emit_data,
      .beginnode = bin_emit_beginnode,
      .endnode = bin_emit_endnode,
      .property = bin_emit_property,
};

static void emit_label(FILE *f, const char *prefix, const char *label)
{
      fprintf(f, "\t.globl\t%s_%s\n", prefix, label);
      fprintf(f, "%s_%s:\n", prefix, label);
      fprintf(f, "_%s_%s:\n", prefix, label);
}

static void emit_offset_label(FILE *f, const char *label, int offset)
{
      fprintf(f, "\t.globl\t%s\n", label);
      fprintf(f, "%s\t= . + %d\n", label, offset);
}

static void asm_emit_cell(void *e, cell_t val)
{
      FILE *f = e;

      fprintf(f, "\t.long\t0x%x\n", val);
}

static void asm_emit_string(void *e, char *str, int len)
{
      FILE *f = e;
      char c = 0;

      if (len != 0) {
            /* XXX: ewww */
            c = str[len];
            str[len] = '\0';
      }

      fprintf(f, "\t.string\t\"%s\"\n", str);

      if (len != 0) {
            str[len] = c;
      }
}

static void asm_emit_align(void *e, int a)
{
      FILE *f = e;

      fprintf(f, "\t.balign\t%d\n", a);
}

static void asm_emit_data(void *e, struct data d)
{
      FILE *f = e;
      int off = 0;
      struct marker *m = d.markers;

      for_each_marker_of_type(m, LABEL)
            emit_offset_label(f, m->ref, m->offset);

      while ((d.len - off) >= sizeof(uint32_t)) {
            fprintf(f, "\t.long\t0x%x\n",
                  fdt32_to_cpu(*((uint32_t *)(d.val+off))));
            off += sizeof(uint32_t);
      }

      while ((d.len - off) >= 1) {
            fprintf(f, "\t.byte\t0x%hhx\n", d.val[off]);
            off += 1;
      }

      assert(off == d.len);
}

static void asm_emit_beginnode(void *e, const char *label)
{
      FILE *f = e;

      if (label) {
            fprintf(f, "\t.globl\t%s\n", label);
            fprintf(f, "%s:\n", label);
      }
      fprintf(f, "\t.long\tFDT_BEGIN_NODE\n");
}

static void asm_emit_endnode(void *e, const char *label)
{
      FILE *f = e;

      fprintf(f, "\t.long\tFDT_END_NODE\n");
      if (label) {
            fprintf(f, "\t.globl\t%s_end\n", label);
            fprintf(f, "%s_end:\n", label);
      }
}

static void asm_emit_property(void *e, const char *label)
{
      FILE *f = e;

      if (label) {
            fprintf(f, "\t.globl\t%s\n", label);
            fprintf(f, "%s:\n", label);
      }
      fprintf(f, "\t.long\tFDT_PROP\n");
}

static struct emitter asm_emitter = {
      .cell = asm_emit_cell,
      .string = asm_emit_string,
      .align = asm_emit_align,
      .data = asm_emit_data,
      .beginnode = asm_emit_beginnode,
      .endnode = asm_emit_endnode,
      .property = asm_emit_property,
};

static int stringtable_insert(struct data *d, const char *str)
{
      int i;

      /* FIXME: do this more efficiently? */

      for (i = 0; i < d->len; i++) {
            if (streq(str, d->val + i))
                  return i;
      }

      *d = data_append_data(*d, str, strlen(str)+1);
      return i;
}

static void flatten_tree(struct node *tree, struct emitter *emit,
                   void *etarget, struct data *strbuf,
                   struct version_info *vi)
{
      struct property *prop;
      struct node *child;
      int seen_name_prop = 0;

      emit->beginnode(etarget, tree->label);

      if (vi->flags & FTF_FULLPATH)
            emit->string(etarget, tree->fullpath, 0);
      else
            emit->string(etarget, tree->name, 0);

      emit->align(etarget, sizeof(cell_t));

      for_each_property(tree, prop) {
            int nameoff;

            if (streq(prop->name, "name"))
                  seen_name_prop = 1;

            nameoff = stringtable_insert(strbuf, prop->name);

            emit->property(etarget, prop->label);
            emit->cell(etarget, prop->val.len);
            emit->cell(etarget, nameoff);

            if ((vi->flags & FTF_VARALIGN) && (prop->val.len >= 8))
                  emit->align(etarget, 8);

            emit->data(etarget, prop->val);
            emit->align(etarget, sizeof(cell_t));
      }

      if ((vi->flags & FTF_NAMEPROPS) && !seen_name_prop) {
            emit->property(etarget, NULL);
            emit->cell(etarget, tree->basenamelen+1);
            emit->cell(etarget, stringtable_insert(strbuf, "name"));

            if ((vi->flags & FTF_VARALIGN) && ((tree->basenamelen+1) >= 8))
                  emit->align(etarget, 8);

            emit->string(etarget, tree->name, tree->basenamelen);
            emit->align(etarget, sizeof(cell_t));
      }

      for_each_child(tree, child) {
            flatten_tree(child, emit, etarget, strbuf, vi);
      }

      emit->endnode(etarget, tree->label);
}

static struct data flatten_reserve_list(struct reserve_info *reservelist,
                         struct version_info *vi)
{
      struct reserve_info *re;
      struct data d = empty_data;
      static struct fdt_reserve_entry null_re = {0,0};
      int    j;

      for (re = reservelist; re; re = re->next) {
            d = data_append_re(d, &re->re);
      }
      /*
       * Add additional reserved slots if the user asked for them.
       */
      for (j = 0; j < reservenum; j++) {
            d = data_append_re(d, &null_re);
      }

      return d;
}

static void make_fdt_header(struct fdt_header *fdt,
                      struct version_info *vi,
                      int reservesize, int dtsize, int strsize,
                      int boot_cpuid_phys)
{
      int reserve_off;

      reservesize += sizeof(struct fdt_reserve_entry);

      memset(fdt, 0xff, sizeof(*fdt));

      fdt->magic = cpu_to_fdt32(FDT_MAGIC);
      fdt->version = cpu_to_fdt32(vi->version);
      fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version);

      /* Reserve map should be doubleword aligned */
      reserve_off = ALIGN(vi->hdr_size, 8);

      fdt->off_mem_rsvmap = cpu_to_fdt32(reserve_off);
      fdt->off_dt_struct = cpu_to_fdt32(reserve_off + reservesize);
      fdt->off_dt_strings = cpu_to_fdt32(reserve_off + reservesize
                                + dtsize);
      fdt->totalsize = cpu_to_fdt32(reserve_off + reservesize + dtsize + strsize);

      if (vi->flags & FTF_BOOTCPUID)
            fdt->boot_cpuid_phys = cpu_to_fdt32(boot_cpuid_phys);
      if (vi->flags & FTF_STRTABSIZE)
            fdt->size_dt_strings = cpu_to_fdt32(strsize);
      if (vi->flags & FTF_STRUCTSIZE)
            fdt->size_dt_struct = cpu_to_fdt32(dtsize);
}

void dt_to_blob(FILE *f, struct boot_info *bi, int version)
{
      struct version_info *vi = NULL;
      int i;
      struct data blob       = empty_data;
      struct data reservebuf = empty_data;
      struct data dtbuf      = empty_data;
      struct data strbuf     = empty_data;
      struct fdt_header fdt;
      int padlen = 0;

      for (i = 0; i < ARRAY_SIZE(version_table); i++) {
            if (version_table[i].version == version)
                  vi = &version_table[i];
      }
      if (!vi)
            die("Unknown device tree blob version %d\n", version);

      flatten_tree(bi->dt, &bin_emitter, &dtbuf, &strbuf, vi);
      bin_emit_cell(&dtbuf, FDT_END);

      reservebuf = flatten_reserve_list(bi->reservelist, vi);

      /* Make header */
      make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len,
                  bi->boot_cpuid_phys);

      /*
       * If the user asked for more space than is used, adjust the totalsize.
       */
      if (minsize > 0) {
            padlen = minsize - fdt32_to_cpu(fdt.totalsize);
            if ((padlen < 0) && (quiet < 1))
                  fprintf(stderr,
                        "Warning: blob size %d >= minimum size %d\n",
                        fdt32_to_cpu(fdt.totalsize), minsize);
      }

      if (padsize > 0)
            padlen = padsize;

      if (padlen > 0) {
            int tsize = fdt32_to_cpu(fdt.totalsize);
            tsize += padlen;
            fdt.totalsize = cpu_to_fdt32(tsize);
      }

      /*
       * Assemble the blob: start with the header, add with alignment
       * the reserve buffer, add the reserve map terminating zeroes,
       * the device tree itself, and finally the strings.
       */
      blob = data_append_data(blob, &fdt, vi->hdr_size);
      blob = data_append_align(blob, 8);
      blob = data_merge(blob, reservebuf);
      blob = data_append_zeroes(blob, sizeof(struct fdt_reserve_entry));
      blob = data_merge(blob, dtbuf);
      blob = data_merge(blob, strbuf);

      /*
       * If the user asked for more space than is used, pad out the blob.
       */
      if (padlen > 0)
            blob = data_append_zeroes(blob, padlen);

      fwrite(blob.val, blob.len, 1, f);

      if (ferror(f))
            die("Error writing device tree blob: %s\n", strerror(errno));

      /*
       * data_merge() frees the right-hand element so only the blob
       * remains to be freed.
       */
      data_free(blob);
}

static void dump_stringtable_asm(FILE *f, struct data strbuf)
{
      const char *p;
      int len;

      p = strbuf.val;

      while (p < (strbuf.val + strbuf.len)) {
            len = strlen(p);
            fprintf(f, "\t.string \"%s\"\n", p);
            p += len+1;
      }
}

void dt_to_asm(FILE *f, struct boot_info *bi, int version)
{
      struct version_info *vi = NULL;
      int i;
      struct data strbuf = empty_data;
      struct reserve_info *re;
      const char *symprefix = "dt";

      for (i = 0; i < ARRAY_SIZE(version_table); i++) {
            if (version_table[i].version == version)
                  vi = &version_table[i];
      }
      if (!vi)
            die("Unknown device tree blob version %d\n", version);

      fprintf(f, "/* autogenerated by dtc, do not edit */\n\n");
      fprintf(f, "#define FDT_MAGIC 0x%x\n", FDT_MAGIC);
      fprintf(f, "#define FDT_BEGIN_NODE 0x%x\n", FDT_BEGIN_NODE);
      fprintf(f, "#define FDT_END_NODE 0x%x\n", FDT_END_NODE);
      fprintf(f, "#define FDT_PROP 0x%x\n", FDT_PROP);
      fprintf(f, "#define FDT_END 0x%x\n", FDT_END);
      fprintf(f, "\n");

      emit_label(f, symprefix, "blob_start");
      emit_label(f, symprefix, "header");
      fprintf(f, "\t.long\tFDT_MAGIC\t\t\t\t/* magic */\n");
      fprintf(f, "\t.long\t_%s_blob_abs_end - _%s_blob_start\t/* totalsize */\n",
            symprefix, symprefix);
      fprintf(f, "\t.long\t_%s_struct_start - _%s_blob_start\t/* off_dt_struct */\n",
            symprefix, symprefix);
      fprintf(f, "\t.long\t_%s_strings_start - _%s_blob_start\t/* off_dt_strings */\n",
            symprefix, symprefix);
      fprintf(f, "\t.long\t_%s_reserve_map - _%s_blob_start\t/* off_dt_strings */\n",
            symprefix, symprefix);
      fprintf(f, "\t.long\t%d\t\t\t\t\t/* version */\n", vi->version);
      fprintf(f, "\t.long\t%d\t\t\t\t\t/* last_comp_version */\n",
            vi->last_comp_version);

      if (vi->flags & FTF_BOOTCPUID)
            fprintf(f, "\t.long\t%i\t\t\t\t\t/* boot_cpuid_phys */\n",
                  bi->boot_cpuid_phys);

      if (vi->flags & FTF_STRTABSIZE)
            fprintf(f, "\t.long\t_%s_strings_end - _%s_strings_start\t/* size_dt_strings */\n",
                  symprefix, symprefix);

      if (vi->flags & FTF_STRUCTSIZE)
            fprintf(f, "\t.long\t_%s_struct_end - _%s_struct_start\t/* size_dt_struct */\n",
                  symprefix, symprefix);

      /*
       * Reserve map entries.
       * Align the reserve map to a doubleword boundary.
       * Each entry is an (address, size) pair of u64 values.
       * Always supply a zero-sized temination entry.
       */
      asm_emit_align(f, 8);
      emit_label(f, symprefix, "reserve_map");

      fprintf(f, "/* Memory reserve map from source file */\n");

      /*
       * Use .long on high and low halfs of u64s to avoid .quad
       * as it appears .quad isn't available in some assemblers.
       */
      for (re = bi->reservelist; re; re = re->next) {
            if (re->label) {
                  fprintf(f, "\t.globl\t%s\n", re->label);
                  fprintf(f, "%s:\n", re->label);
            }
            fprintf(f, "\t.long\t0x%08x, 0x%08x\n",
                  (unsigned int)(re->re.address >> 32),
                  (unsigned int)(re->re.address & 0xffffffff));
            fprintf(f, "\t.long\t0x%08x, 0x%08x\n",
                  (unsigned int)(re->re.size >> 32),
                  (unsigned int)(re->re.size & 0xffffffff));
      }
      for (i = 0; i < reservenum; i++) {
            fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n");
      }

      fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n");

      emit_label(f, symprefix, "struct_start");
      flatten_tree(bi->dt, &asm_emitter, f, &strbuf, vi);
      fprintf(f, "\t.long\tFDT_END\n");
      emit_label(f, symprefix, "struct_end");

      emit_label(f, symprefix, "strings_start");
      dump_stringtable_asm(f, strbuf);
      emit_label(f, symprefix, "strings_end");

      emit_label(f, symprefix, "blob_end");

      /*
       * If the user asked for more space than is used, pad it out.
       */
      if (minsize > 0) {
            fprintf(f, "\t.space\t%d - (_%s_blob_end - _%s_blob_start), 0\n",
                  minsize, symprefix, symprefix);
      }
      if (padsize > 0) {
            fprintf(f, "\t.space\t%d, 0\n", padsize);
      }
      emit_label(f, symprefix, "blob_abs_end");

      data_free(strbuf);
}

struct inbuf {
      char *base, *limit, *ptr;
};

static void inbuf_init(struct inbuf *inb, void *base, void *limit)
{
      inb->base = base;
      inb->limit = limit;
      inb->ptr = inb->base;
}

static void flat_read_chunk(struct inbuf *inb, void *p, int len)
{
      if ((inb->ptr + len) > inb->limit)
            die("Premature end of data parsing flat device tree\n");

      memcpy(p, inb->ptr, len);

      inb->ptr += len;
}

static uint32_t flat_read_word(struct inbuf *inb)
{
      uint32_t val;

      assert(((inb->ptr - inb->base) % sizeof(val)) == 0);

      flat_read_chunk(inb, &val, sizeof(val));

      return fdt32_to_cpu(val);
}

static void flat_realign(struct inbuf *inb, int align)
{
      int off = inb->ptr - inb->base;

      inb->ptr = inb->base + ALIGN(off, align);
      if (inb->ptr > inb->limit)
            die("Premature end of data parsing flat device tree\n");
}

static char *flat_read_string(struct inbuf *inb)
{
      int len = 0;
      const char *p = inb->ptr;
      char *str;

      do {
            if (p >= inb->limit)
                  die("Premature end of data parsing flat device tree\n");
            len++;
      } while ((*p++) != '\0');

      str = strdup(inb->ptr);

      inb->ptr += len;

      flat_realign(inb, sizeof(uint32_t));

      return str;
}

static struct data flat_read_data(struct inbuf *inb, int len)
{
      struct data d = empty_data;

      if (len == 0)
            return empty_data;

      d = data_grow_for(d, len);
      d.len = len;

      flat_read_chunk(inb, d.val, len);

      flat_realign(inb, sizeof(uint32_t));

      return d;
}

static char *flat_read_stringtable(struct inbuf *inb, int offset)
{
      const char *p;

      p = inb->base + offset;
      while (1) {
            if (p >= inb->limit || p < inb->base)
                  die("String offset %d overruns string table\n",
                      offset);

            if (*p == '\0')
                  break;

            p++;
      }

      return strdup(inb->base + offset);
}

static struct property *flat_read_property(struct inbuf *dtbuf,
                                 struct inbuf *strbuf, int flags)
{
      uint32_t proplen, stroff;
      char *name;
      struct data val;

      proplen = flat_read_word(dtbuf);
      stroff = flat_read_word(dtbuf);

      name = flat_read_stringtable(strbuf, stroff);

      if ((flags & FTF_VARALIGN) && (proplen >= 8))
            flat_realign(dtbuf, 8);

      val = flat_read_data(dtbuf, proplen);

      return build_property(name, val, NULL);
}


static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb)
{
      struct reserve_info *reservelist = NULL;
      struct reserve_info *new;
      const char *p;
      struct fdt_reserve_entry re;

      /*
       * Each entry is a pair of u64 (addr, size) values for 4 cell_t's.
       * List terminates at an entry with size equal to zero.
       *
       * First pass, count entries.
       */
      p = inb->ptr;
      while (1) {
            flat_read_chunk(inb, &re, sizeof(re));
            re.address  = fdt64_to_cpu(re.address);
            re.size = fdt64_to_cpu(re.size);
            if (re.size == 0)
                  break;

            new = build_reserve_entry(re.address, re.size, NULL);
            reservelist = add_reserve_entry(reservelist, new);
      }

      return reservelist;
}


static char *nodename_from_path(const char *ppath, const char *cpath)
{
      int plen;

      plen = strlen(ppath);

      if (!strneq(ppath, cpath, plen))
            die("Path \"%s\" is not valid as a child of \"%s\"\n",
                cpath, ppath);

      /* root node is a special case */
      if (!streq(ppath, "/"))
            plen++;

      return strdup(cpath + plen);
}

static struct node *unflatten_tree(struct inbuf *dtbuf,
                           struct inbuf *strbuf,
                           const char *parent_flatname, int flags)
{
      struct node *node;
      char *flatname;
      uint32_t val;

      node = build_node(NULL, NULL);

      flatname = flat_read_string(dtbuf);

      if (flags & FTF_FULLPATH)
            node->name = nodename_from_path(parent_flatname, flatname);
      else
            node->name = flatname;

      do {
            struct property *prop;
            struct node *child;

            val = flat_read_word(dtbuf);
            switch (val) {
            case FDT_PROP:
                  if (node->children)
                        fprintf(stderr, "Warning: Flat tree input has "
                              "subnodes preceding a property.\n");
                  prop = flat_read_property(dtbuf, strbuf, flags);
                  add_property(node, prop);
                  break;

            case FDT_BEGIN_NODE:
                  child = unflatten_tree(dtbuf,strbuf, flatname, flags);
                  add_child(node, child);
                  break;

            case FDT_END_NODE:
                  break;

            case FDT_END:
                  die("Premature FDT_END in device tree blob\n");
                  break;

            case FDT_NOP:
                  if (!(flags & FTF_NOPS))
                        fprintf(stderr, "Warning: NOP tag found in flat tree"
                              " version <16\n");

                  /* Ignore */
                  break;

            default:
                  die("Invalid opcode word %08x in device tree blob\n",
                      val);
            }
      } while (val != FDT_END_NODE);

      return node;
}


struct boot_info *dt_from_blob(const char *fname)
{
      struct dtc_file *dtcf;
      uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys;
      uint32_t off_dt, off_str, off_mem_rsvmap;
      int rc;
      char *blob;
      struct fdt_header *fdt;
      char *p;
      struct inbuf dtbuf, strbuf;
      struct inbuf memresvbuf;
      int sizeleft;
      struct reserve_info *reservelist;
      struct node *tree;
      uint32_t val;
      int flags = 0;

      dtcf = dtc_open_file(fname, NULL);

      rc = fread(&magic, sizeof(magic), 1, dtcf->file);
      if (ferror(dtcf->file))
            die("Error reading DT blob magic number: %s\n",
                strerror(errno));
      if (rc < 1) {
            if (feof(dtcf->file))
                  die("EOF reading DT blob magic number\n");
            else
                  die("Mysterious short read reading magic number\n");
      }

      magic = fdt32_to_cpu(magic);
      if (magic != FDT_MAGIC)
            die("Blob has incorrect magic number\n");

      rc = fread(&totalsize, sizeof(totalsize), 1, dtcf->file);
      if (ferror(dtcf->file))
            die("Error reading DT blob size: %s\n", strerror(errno));
      if (rc < 1) {
            if (feof(dtcf->file))
                  die("EOF reading DT blob size\n");
            else
                  die("Mysterious short read reading blob size\n");
      }

      totalsize = fdt32_to_cpu(totalsize);
      if (totalsize < FDT_V1_SIZE)
            die("DT blob size (%d) is too small\n", totalsize);

      blob = xmalloc(totalsize);

      fdt = (struct fdt_header *)blob;
      fdt->magic = cpu_to_fdt32(magic);
      fdt->totalsize = cpu_to_fdt32(totalsize);

      sizeleft = totalsize - sizeof(magic) - sizeof(totalsize);
      p = blob + sizeof(magic)  + sizeof(totalsize);

      while (sizeleft) {
            if (feof(dtcf->file))
                  die("EOF before reading %d bytes of DT blob\n",
                      totalsize);

            rc = fread(p, 1, sizeleft, dtcf->file);
            if (ferror(dtcf->file))
                  die("Error reading DT blob: %s\n",
                      strerror(errno));

            sizeleft -= rc;
            p += rc;
      }

      off_dt = fdt32_to_cpu(fdt->off_dt_struct);
      off_str = fdt32_to_cpu(fdt->off_dt_strings);
      off_mem_rsvmap = fdt32_to_cpu(fdt->off_mem_rsvmap);
      version = fdt32_to_cpu(fdt->version);
      boot_cpuid_phys = fdt32_to_cpu(fdt->boot_cpuid_phys);

      if (off_mem_rsvmap >= totalsize)
            die("Mem Reserve structure offset exceeds total size\n");

      if (off_dt >= totalsize)
            die("DT structure offset exceeds total size\n");

      if (off_str > totalsize)
            die("String table offset exceeds total size\n");

      if (version >= 3) {
            uint32_t size_str = fdt32_to_cpu(fdt->size_dt_strings);
            if (off_str+size_str > totalsize)
                  die("String table extends past total size\n");
            inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str);
      } else {
            inbuf_init(&strbuf, blob + off_str, blob + totalsize);
      }

      if (version >= 17) {
            size_dt = fdt32_to_cpu(fdt->size_dt_struct);
            if (off_dt+size_dt > totalsize)
                  die("Structure block extends past total size\n");
      }

      if (version < 16) {
            flags |= FTF_FULLPATH | FTF_NAMEPROPS | FTF_VARALIGN;
      } else {
            flags |= FTF_NOPS;
      }

      inbuf_init(&memresvbuf,
               blob + off_mem_rsvmap, blob + totalsize);
      inbuf_init(&dtbuf, blob + off_dt, blob + totalsize);

      reservelist = flat_read_mem_reserve(&memresvbuf);

      val = flat_read_word(&dtbuf);

      if (val != FDT_BEGIN_NODE)
            die("Device tree blob doesn't begin with FDT_BEGIN_NODE (begins with 0x%08x)\n", val);

      tree = unflatten_tree(&dtbuf, &strbuf, "", flags);

      val = flat_read_word(&dtbuf);
      if (val != FDT_END)
            die("Device tree blob doesn't end with FDT_END\n");

      free(blob);

      dtc_close_file(dtcf);

      return build_boot_info(reservelist, tree, boot_cpuid_phys);
}

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