%PDF-
%PDF-
Mini Shell
Mini Shell
// 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 0x%02x; .byte 0x%02x; .byte 0x%02x; .byte 0x%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.string\t\"%.*s\"\n", len, str);
else
fprintf(f, "\t.string\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;
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.string \"%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 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 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 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 = xstrdup(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 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 xstrdup(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, 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);
if (node->name != flatname) {
free(flatname);
}
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;
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);
return build_dt_info(DTSF_V1, reservelist, tree, boot_cpuid_phys);
}
Zerion Mini Shell 1.0