OpenWrt – Rev 1
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/*
* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h> /* for unlink() */
#include <libgen.h>
#include <getopt.h> /* for getopt() */
#include <stdarg.h>
#include <errno.h>
#include <sys/stat.h>
#include "cyg_crc.h"
#if (__BYTE_ORDER == __BIG_ENDIAN)
# define HOST_TO_BE32(x) (x)
# define BE32_TO_HOST(x) (x)
# define HOST_TO_LE32(x) bswap_32(x)
# define LE32_TO_HOST(x) bswap_32(x)
#else
# define HOST_TO_BE32(x) bswap_32(x)
# define BE32_TO_HOST(x) bswap_32(x)
# define HOST_TO_LE32(x) (x)
# define LE32_TO_HOST(x) (x)
#endif
#define MAGIC_FIRMWARE 0x6d726966 /* 'firm' */
#define MAGIC_KERNEL 0x676d694b /* 'Kimg' */
#define MAGIC_ROOTFS 0x676d6952 /* 'Rimg' */
struct file_info {
char *file_name; /* name of the file */
uint32_t file_size; /* length of the file */
};
struct fw_header {
uint32_t magic;
uint32_t length;
uint32_t unk1;
uint32_t unk2;
} __attribute__ ((packed));
struct fw_tail {
uint32_t hw_id;
uint32_t crc;
} __attribute__ ((packed));
struct board_info {
char *id;
uint32_t hw_id;
uint32_t kernel_len;
uint32_t rootfs_len;
};
/*
* Globals
*/
static char *ofname;
static char *progname;
static char *board_id;
static struct board_info *board;
static struct file_info kernel_info;
static struct file_info rootfs_info;
static struct board_info boards[] = {
{
.id = "ZCN-1523H-2-8",
.hw_id = 0x66661523,
.kernel_len = 0x170000,
.rootfs_len = 0x610000,
}, {
.id = "ZCN-1523H-5-16",
.hw_id = 0x6615235A,
.kernel_len = 0x170000,
.rootfs_len = 0x610000,
}, {
/* terminating entry */
}
};
/*
* Message macros
*/
#define ERR(fmt, ...) do { \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt "\n", \
progname, ## __VA_ARGS__ ); \
} while (0)
#define ERRS(fmt, ...) do { \
int save = errno; \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt ": %s\n", \
progname, ## __VA_ARGS__, strerror(save)); \
} while (0)
#define DBG(fmt, ...) do { \
fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
} while (0)
static struct board_info *find_board(char *id)
{
struct board_info *ret;
struct board_info *board;
ret = NULL;
for (board = boards; board->id != NULL; board++){
if (strcasecmp(id, board->id) == 0) {
ret = board;
break;
}
};
return ret;
}
static void usage(int status)
{
FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
struct board_info *board;
fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
fprintf(stream,
"\n"
"Options:\n"
" -B <board> create image for the board specified with <board>\n"
" -k <file> read kernel image from the file <file>\n"
" -r <file> read rootfs image from the file <file>\n"
" -o <file> write output to the file <file>\n"
" -h show this screen\n"
);
exit(status);
}
static int get_file_stat(struct file_info *fdata)
{
struct stat st;
int res;
if (fdata->file_name == NULL)
return 0;
res = stat(fdata->file_name, &st);
if (res){
ERRS("stat failed on %s", fdata->file_name);
return res;
}
fdata->file_size = st.st_size;
return 0;
}
static int read_to_buf(struct file_info *fdata, char *buf)
{
FILE *f;
int ret = EXIT_FAILURE;
f = fopen(fdata->file_name, "r");
if (f == NULL) {
ERRS("could not open \"%s\" for reading", fdata->file_name);
goto out;
}
errno = 0;
fread(buf, fdata->file_size, 1, f);
if (errno != 0) {
ERRS("unable to read from file \"%s\"", fdata->file_name);
goto out_close;
}
ret = EXIT_SUCCESS;
out_close:
fclose(f);
out:
return ret;
}
static int check_options(void)
{
int ret;
if (board_id == NULL) {
ERR("no board specified");
return -1;
}
board = find_board(board_id);
if (board == NULL) {
ERR("unknown/unsupported board id \"%s\"", board_id);
return -1;
}
if (kernel_info.file_name == NULL) {
ERR("no kernel image specified");
return -1;
}
ret = get_file_stat(&kernel_info);
if (ret)
return ret;
if (kernel_info.file_size > board->kernel_len) {
ERR("kernel image is too big");
return -1;
}
if (rootfs_info.file_name == NULL) {
ERR("no rootfs image specified");
return -1;
}
ret = get_file_stat(&rootfs_info);
if (ret)
return ret;
if (rootfs_info.file_size > board->rootfs_len) {
ERR("rootfs image is too big");
return -1;
}
if (ofname == NULL) {
ERR("no output file specified");
return -1;
}
return 0;
}
static int write_fw(char *data, int len)
{
FILE *f;
int ret = EXIT_FAILURE;
f = fopen(ofname, "w");
if (f == NULL) {
ERRS("could not open \"%s\" for writing", ofname);
goto out;
}
errno = 0;
fwrite(data, len, 1, f);
if (errno) {
ERRS("unable to write output file");
goto out_flush;
}
DBG("firmware file \"%s\" completed", ofname);
ret = EXIT_SUCCESS;
out_flush:
fflush(f);
fclose(f);
if (ret != EXIT_SUCCESS) {
unlink(ofname);
}
out:
return ret;
}
static int build_fw(void)
{
int buflen;
char *buf;
char *p;
int ret = EXIT_FAILURE;
int writelen = 0;
uint32_t crc;
struct fw_header *hdr;
struct fw_tail *tail;
buflen = 3 * sizeof(struct fw_header) +
kernel_info.file_size + rootfs_info.file_size +
3 * sizeof(struct fw_tail);
buf = malloc(buflen);
if (!buf) {
ERR("no memory for buffer\n");
goto out;
}
p = buf;
memset(p, 0, buflen);
/* fill firmware header */
hdr = (struct fw_header *) p;
hdr->magic = HOST_TO_LE32(MAGIC_FIRMWARE);
hdr->length = HOST_TO_LE32(buflen - sizeof(struct fw_header));
p += sizeof(struct fw_header);
/* fill kernel block header */
hdr = (struct fw_header *) p;
hdr->magic = HOST_TO_LE32(MAGIC_KERNEL);
hdr->length = HOST_TO_LE32(kernel_info.file_size +
sizeof(struct fw_tail));
p += sizeof(struct fw_header);
/* read kernel data */
ret = read_to_buf(&kernel_info, p);
if (ret)
goto out_free_buf;
/* fill firmware tail */
tail = (struct fw_tail *) (p + kernel_info.file_size);
tail->hw_id = HOST_TO_BE32(board->hw_id);
tail->crc = HOST_TO_BE32(cyg_crc32(p, kernel_info.file_size +
sizeof(struct fw_tail) - 4));
p += kernel_info.file_size + sizeof(struct fw_tail);
/* fill rootfs block header */
hdr = (struct fw_header *) p;
hdr->magic = HOST_TO_LE32(MAGIC_ROOTFS);
hdr->length = HOST_TO_LE32(rootfs_info.file_size +
sizeof(struct fw_tail));
p += sizeof(struct fw_header);
/* read rootfs data */
ret = read_to_buf(&rootfs_info, p);
if (ret)
goto out_free_buf;
/* fill firmware tail */
tail = (struct fw_tail *) (p + rootfs_info.file_size);
tail->hw_id = HOST_TO_BE32(board->hw_id);
tail->crc = HOST_TO_BE32(cyg_crc32(p, rootfs_info.file_size +
sizeof(struct fw_tail) - 4));
p += rootfs_info.file_size + sizeof(struct fw_tail);
/* fill firmware tail */
tail = (struct fw_tail *) p;
tail->hw_id = HOST_TO_BE32(board->hw_id);
tail->crc = HOST_TO_BE32(cyg_crc32(buf + sizeof(struct fw_header),
buflen - sizeof(struct fw_header) - 4));
ret = write_fw(buf, buflen);
if (ret)
goto out_free_buf;
ret = EXIT_SUCCESS;
out_free_buf:
free(buf);
out:
return ret;
}
int main(int argc, char *argv[])
{
int ret = EXIT_FAILURE;
int err;
FILE *outfile;
progname = basename(argv[0]);
while ( 1 ) {
int c;
c = getopt(argc, argv, "B:k:r:o:h");
if (c == -1)
break;
switch (c) {
case 'B':
board_id = optarg;
break;
case 'k':
kernel_info.file_name = optarg;
break;
case 'r':
rootfs_info.file_name = optarg;
break;
case 'o':
ofname = optarg;
break;
case 'h':
usage(EXIT_SUCCESS);
break;
default:
usage(EXIT_FAILURE);
break;
}
}
ret = check_options();
if (ret)
goto out;
ret = build_fw();
out:
return ret;
}