Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928// SPDX-License-Identifier: GPL-2.0-or-later/* * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. */
#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 *, const char *, int); void (*align)(void *, int); void (*data)(void *, struct data); void (*beginnode)(void *, struct label *labels); void (*endnode)(void *, struct label *labels); void (*property)(void *, struct label *labels);};
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, const 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, struct label *labels){ bin_emit_cell(e, FDT_BEGIN_NODE);}
static void bin_emit_endnode(void *e, struct label *labels){ bin_emit_cell(e, FDT_END_NODE);}
static void bin_emit_property(void *e, struct label *labels){ 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);}
#define ASM_EMIT_BELONG(f, fmt, ...) \ { \ fprintf((f), "\t.byte\t((" fmt ") >> 24) & 0xff\n", __VA_ARGS__); \ fprintf((f), "\t.byte\t((" fmt ") >> 16) & 0xff\n", __VA_ARGS__); \ fprintf((f), "\t.byte\t((" fmt ") >> 8) & 0xff\n", __VA_ARGS__); \ fprintf((f), "\t.byte\t(" fmt ") & 0xff\n", __VA_ARGS__); \ }
static void asm_emit_cell(void *e, cell_t val){ FILE *f = e;
fprintf(f, "\t.byte\t0x%02x\n" "\t.byte\t0x%02x\n" "\t.byte\t0x%02x\n" "\t.byte\t0x%02x\n", (val >> 24) & 0xff, (val >> 16) & 0xff, (val >> 8) & 0xff, val & 0xff);}
static void asm_emit_string(void *e, const char *str, int len){ FILE *f = e;
if (len != 0) fprintf(f, "\t.asciz\t\"%.*s\"\n", len, str); else fprintf(f, "\t.asciz\t\"%s\"\n", str);}
static void asm_emit_align(void *e, int a){ FILE *f = e;
fprintf(f, "\t.balign\t%d, 0\n", a);}
static void asm_emit_data(void *e, struct data d){ FILE *f = e; unsigned 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)) { asm_emit_cell(e, dtb_ld32(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, struct label *labels){ FILE *f = e; struct label *l;
for_each_label(labels, l) { fprintf(f, "\t.globl\t%s\n", l->label); fprintf(f, "%s:\n", l->label); } fprintf(f, "\t/* FDT_BEGIN_NODE */\n"); asm_emit_cell(e, FDT_BEGIN_NODE);}
static void asm_emit_endnode(void *e, struct label *labels){ FILE *f = e; struct label *l;
fprintf(f, "\t/* FDT_END_NODE */\n"); asm_emit_cell(e, FDT_END_NODE); for_each_label(labels, l) { fprintf(f, "\t.globl\t%s_end\n", l->label); fprintf(f, "%s_end:\n", l->label); }}
static void asm_emit_property(void *e, struct label *labels){ FILE *f = e; struct label *l;
for_each_label(labels, l) { fprintf(f, "\t.globl\t%s\n", l->label); fprintf(f, "%s:\n", l->label); } fprintf(f, "\t/* FDT_PROP */\n"); asm_emit_cell(e, FDT_PROP);}
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){ unsigned 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; bool seen_name_prop = false;
if (tree->deleted) return;
emit->beginnode(etarget, tree->labels);
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 = true;
nameoff = stringtable_insert(strbuf, prop->name);
emit->property(etarget, prop->labels); 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->labels);}
static struct data flatten_reserve_list(struct reserve_info *reservelist, struct version_info *vi){ struct reserve_info *re; struct data d = empty_data; unsigned int j;
for (re = reservelist; re; re = re->next) { d = data_append_re(d, re->address, re->size); } /* * Add additional reserved slots if the user asked for them. */ for (j = 0; j < reservenum; j++) { d = data_append_re(d, 0, 0); }
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 dt_info *dti, int version){ struct version_info *vi = NULL; unsigned 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(dti->dt, &bin_emitter, &dtbuf, &strbuf, vi); bin_emit_cell(&dtbuf, FDT_END);
reservebuf = flatten_reserve_list(dti->reservelist, vi);
/* Make header */ make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len, dti->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) { padlen = 0; if (quiet < 1) fprintf(stderr, "Warning: blob size %"PRIu32" >= minimum size %d\n", fdt32_to_cpu(fdt.totalsize), minsize); } }
if (padsize > 0) padlen = padsize;
if (alignsize > 0) padlen = ALIGN(fdt32_to_cpu(fdt.totalsize) + padlen, alignsize) - fdt32_to_cpu(fdt.totalsize);
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);
if (fwrite(blob.val, blob.len, 1, f) != 1) { if (ferror(f)) die("Error writing device tree blob: %s\n", strerror(errno)); else die("Short write on device tree blob\n"); }
/* * 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.asciz \"%s\"\n", p); p += len+1; }}
void dt_to_asm(FILE *f, struct dt_info *dti, int version){ struct version_info *vi = NULL; unsigned 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");
emit_label(f, symprefix, "blob_start"); emit_label(f, symprefix, "header"); fprintf(f, "\t/* magic */\n"); asm_emit_cell(f, FDT_MAGIC); fprintf(f, "\t/* totalsize */\n"); ASM_EMIT_BELONG(f, "_%s_blob_abs_end - _%s_blob_start", symprefix, symprefix); fprintf(f, "\t/* off_dt_struct */\n"); ASM_EMIT_BELONG(f, "_%s_struct_start - _%s_blob_start", symprefix, symprefix); fprintf(f, "\t/* off_dt_strings */\n"); ASM_EMIT_BELONG(f, "_%s_strings_start - _%s_blob_start", symprefix, symprefix); fprintf(f, "\t/* off_mem_rsvmap */\n"); ASM_EMIT_BELONG(f, "_%s_reserve_map - _%s_blob_start", symprefix, symprefix); fprintf(f, "\t/* version */\n"); asm_emit_cell(f, vi->version); fprintf(f, "\t/* last_comp_version */\n"); asm_emit_cell(f, vi->last_comp_version);
if (vi->flags & FTF_BOOTCPUID) { fprintf(f, "\t/* boot_cpuid_phys */\n"); asm_emit_cell(f, dti->boot_cpuid_phys); }
if (vi->flags & FTF_STRTABSIZE) { fprintf(f, "\t/* size_dt_strings */\n"); ASM_EMIT_BELONG(f, "_%s_strings_end - _%s_strings_start", symprefix, symprefix); }
if (vi->flags & FTF_STRUCTSIZE) { fprintf(f, "\t/* size_dt_struct */\n"); ASM_EMIT_BELONG(f, "_%s_struct_end - _%s_struct_start", 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 termination 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 halves of u64s to avoid .quad * as it appears .quad isn't available in some assemblers. */ for (re = dti->reservelist; re; re = re->next) { struct label *l;
for_each_label(re->labels, l) { fprintf(f, "\t.globl\t%s\n", l->label); fprintf(f, "%s:\n", l->label); } ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->address >> 32)); ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->address & 0xffffffff)); ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->size >> 32)); ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(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(dti->dt, &asm_emitter, f, &strbuf, vi);
fprintf(f, "\t/* FDT_END */\n"); asm_emit_cell(f, FDT_END); 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); } if (alignsize > 0) asm_emit_align(f, alignsize); 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){ fdt32_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 const char *flat_read_string(struct inbuf *inb){ int len = 0; const char *p = inb->ptr; const char *str;
do { if (p >= inb->limit) die("Premature end of data parsing flat device tree\n"); len++; } while ((*p++) != '\0');
str = 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 xstrdup(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; 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. */ while (1) { uint64_t address, size;
flat_read_chunk(inb, &re, sizeof(re)); address = fdt64_to_cpu(re.address); size = fdt64_to_cpu(re.size); if (size == 0) break;
new = build_reserve_entry(address, size); reservelist = add_reserve_entry(reservelist, new); }
return reservelist;}
static const char *nodename_from_path(const char *ppath, const char *cpath){ int plen;
plen = strlen(ppath);
if (!strstarts(cpath, ppath)) 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 cpath + plen;}
static struct node *unflatten_tree(struct inbuf *dtbuf, struct inbuf *strbuf, const char *parent_flatname, int flags){ struct node *node; const char *flatname; uint32_t val;
node = build_node(NULL, NULL, NULL);
flatname = flat_read_string(dtbuf);
if (flags & FTF_FULLPATH) node->name = xstrdup(nodename_from_path(parent_flatname, flatname)); else node->name = xstrdup(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 dt_info *dt_from_blob(const char *fname){ FILE *f; fdt32_t magic_buf, totalsize_buf; 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; unsigned int dtsflags = DTSF_V1;
f = srcfile_relative_open(fname, NULL);
rc = fread(&magic_buf, sizeof(magic_buf), 1, f); if (ferror(f)) die("Error reading DT blob magic number: %s\n", strerror(errno)); if (rc < 1) { if (feof(f)) die("EOF reading DT blob magic number\n"); else die("Mysterious short read reading magic number\n"); }
magic = fdt32_to_cpu(magic_buf); if (magic != FDT_MAGIC) die("Blob has incorrect magic number\n");
rc = fread(&totalsize_buf, sizeof(totalsize_buf), 1, f); if (ferror(f)) die("Error reading DT blob size: %s\n", strerror(errno)); if (rc < 1) { if (feof(f)) die("EOF reading DT blob size\n"); else die("Mysterious short read reading blob size\n"); }
totalsize = fdt32_to_cpu(totalsize_buf); 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(f)) die("EOF before reading %d bytes of DT blob\n", totalsize);
rc = fread(p, 1, sizeleft, f); if (ferror(f)) 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 < off_str) || (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 < off_dt) || (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);
fclose(f);
if (get_subnode(tree, "__fixups__") || get_subnode(tree, "__local_fixups__")) dtsflags |= DTSF_PLUGIN;
return build_dt_info(dtsflags, reservelist, tree, boot_cpuid_phys);}