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/*
* ftdump.c - Contributed by Pantelis Antoniou <pantelis.antoniou AT gmail.com>
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <netinet/in.h>
#include <byteswap.h>
#include <fdt.h>
#define cpu_to_be16(x) htons(x)
#define be16_to_cpu(x) ntohs(x)
#define cpu_to_be32(x) htonl(x)
#define be32_to_cpu(x) ntohl(x)
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_be64(x) (x)
#define be64_to_cpu(x) (x)
#else
#define cpu_to_be64(x) bswap_64(x)
#define be64_to_cpu(x) bswap_64(x)
#endif
#define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1))
#define PALIGN(p, a) ((void *)(ALIGN((unsigned long)(p), (a))))
#define GET_CELL(p) (p += 4, *((uint32_t *)(p-4)))
static int is_printable_string(const void *data, int len)
{
const char *s = data;
const char *ss;
/* zero length is not */
if (len == 0)
return 0;
/* must terminate with zero */
if (s[len - 1] != '\0')
return 0;
ss = s;
while (*s && isprint(*s))
s++;
/* not zero, or not done yet */
if (*s != '\0' || (s + 1 - ss) < len)
return 0;
return 1;
}
static void print_data(const void *data, int len)
{
int i;
const uint8_t *s;
/* no data, don't print */
if (len == 0)
return;
if (is_printable_string(data, len)) {
printf(" = \"%s\"", (char *)data);
} else if ((len % 4) == 0) {
printf(" = <");
for (i = 0; i < len; i += 4)
printf("%08x%s", *((uint32_t *)data + i),
i < (len - 4) ? " " : "");
printf(">");
} else {
printf(" = [");
for (i = 0, s = data; i < len; i++)
printf("%02x%s", s[i], i < len - 1 ? " " : "");
printf("]");
}
}
static void dump_blob(void *blob)
{
struct fdt_header *bph = blob;
uint32_t off_mem_rsvmap = be32_to_cpu(bph->off_mem_rsvmap);
uint32_t off_dt = be32_to_cpu(bph->off_dt_struct);
uint32_t off_str = be32_to_cpu(bph->off_dt_strings);
struct fdt_reserve_entry *p_rsvmap =
(struct fdt_reserve_entry *)(blob + off_mem_rsvmap);
char *p_struct = blob + off_dt;
char *p_strings = blob + off_str;
uint32_t version = be32_to_cpu(bph->version);
uint32_t totalsize = be32_to_cpu(bph->totalsize);
uint32_t tag;
char *p;
char *s, *t;
int depth, sz, shift;
int i;
uint64_t addr, size;
depth = 0;
shift = 4;
printf("// magic:\t\t0x%x\n", be32_to_cpu(bph->magic));
printf("// totalsize:\t\t0x%x (%d)\n", totalsize, totalsize);
printf("// off_dt_struct:\t0x%x\n", off_dt);
printf("// off_dt_strings:\t0x%x\n", off_str);
printf("// off_mem_rsvmap:\t0x%x\n", off_mem_rsvmap);
printf("// version:\t\t%d\n", version);
printf("// last_comp_version:\t%d\n",
be32_to_cpu(bph->last_comp_version));
if (version >= 2)
printf("// boot_cpuid_phys:\t0x%x\n",
be32_to_cpu(bph->boot_cpuid_phys));
if (version >= 3)
printf("// size_dt_strings:\t0x%x\n",
be32_to_cpu(bph->size_dt_strings));
if (version >= 17)
printf("// size_dt_struct:\t0x%x\n",
be32_to_cpu(bph->size_dt_struct));
printf("\n");
for (i = 0; ; i++) {
addr = be64_to_cpu(p_rsvmap[i].address);
size = be64_to_cpu(p_rsvmap[i].size);
if (addr == 0 && size == 0)
break;
printf("/memreserve/ %llx %llx;\n",
(unsigned long long)addr, (unsigned long long)size);
}
p = p_struct;
while ((tag = be32_to_cpu(GET_CELL(p))) != FDT_END) {
/* printf("tag: 0x%08x (%d)\n", tag, p - p_struct); */
if (tag == FDT_BEGIN_NODE) {
s = p;
p = PALIGN(p + strlen(s) + 1, 4);
if (*s == '\0')
s = "/";
printf("%*s%s {\n", depth * shift, "", s);
depth++;
continue;
}
if (tag == FDT_END_NODE) {
depth--;
printf("%*s};\n", depth * shift, "");
continue;
}
if (tag == FDT_NOP) {
printf("%*s// [NOP]\n", depth * shift, "");
continue;
}
if (tag != FDT_PROP) {
fprintf(stderr, "%*s ** Unknown tag 0x%08x\n", depth * shift, "", tag);
break;
}
sz = be32_to_cpu(GET_CELL(p));
s = p_strings + be32_to_cpu(GET_CELL(p));
if (version < 16 && sz >= 8)
p = PALIGN(p, 8);
t = p;
p = PALIGN(p + sz, 4);
printf("%*s%s", depth * shift, "", s);
print_data(t, sz);
printf(";\n");
}
}
int main(int argc, char *argv[])
{
FILE *fp;
char buf[16384]; /* 16k max */
int size;
if (argc < 2) {
fprintf(stderr, "supply input filename\n");
return 5;
}
fp = fopen(argv[1], "rb");
if (fp == NULL) {
fprintf(stderr, "unable to open %s\n", argv[1]);
return 10;
}
size = fread(buf, 1, sizeof(buf), fp);
if (size == sizeof(buf)) { /* too large */
fprintf(stderr, "file too large\n");
return 10;
}
dump_blob(buf);
fclose(fp);
return 0;
}
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