148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
|
|
* Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/byteorder/generic.h>
|
|
|
|
#include "mtdsplit.h"
|
|
|
|
#define TRX_MAGIC 0x30524448 /* "HDR0" */
|
|
|
|
struct trx_header {
|
|
__le32 magic;
|
|
__le32 len;
|
|
__le32 crc32;
|
|
__le32 flag_version;
|
|
__le32 offset[4];
|
|
};
|
|
|
|
static int
|
|
read_trx_header(struct mtd_info *mtd, size_t offset,
|
|
struct trx_header *header)
|
|
{
|
|
size_t header_len;
|
|
size_t retlen;
|
|
int ret;
|
|
|
|
header_len = sizeof(*header);
|
|
ret = mtd_read(mtd, offset, header_len, &retlen,
|
|
(unsigned char *) header);
|
|
if (ret) {
|
|
pr_debug("read error in \"%s\"\n", mtd->name);
|
|
return ret;
|
|
}
|
|
|
|
if (retlen != header_len) {
|
|
pr_debug("short read in \"%s\"\n", mtd->name);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
mtdsplit_parse_trx(struct mtd_info *master,
|
|
struct mtd_partition **pparts,
|
|
struct mtd_part_parser_data *data)
|
|
{
|
|
struct mtd_partition *parts;
|
|
struct trx_header hdr;
|
|
int nr_parts;
|
|
size_t offset;
|
|
size_t trx_offset;
|
|
size_t trx_size = 0;
|
|
size_t rootfs_offset;
|
|
size_t rootfs_size = 0;
|
|
int ret;
|
|
|
|
nr_parts = 2;
|
|
parts = kzalloc(nr_parts * sizeof(*parts), GFP_KERNEL);
|
|
if (!parts)
|
|
return -ENOMEM;
|
|
|
|
/* find trx image on erase block boundaries */
|
|
for (offset = 0; offset < master->size; offset += master->erasesize) {
|
|
trx_size = 0;
|
|
|
|
ret = read_trx_header(master, offset, &hdr);
|
|
if (ret)
|
|
continue;
|
|
|
|
if (hdr.magic != cpu_to_le32(TRX_MAGIC)) {
|
|
pr_debug("no valid trx header found in \"%s\" at offset %llx\n",
|
|
master->name, (unsigned long long) offset);
|
|
continue;
|
|
}
|
|
|
|
trx_size = le32_to_cpu(hdr.len);
|
|
if ((offset + trx_size) > master->size) {
|
|
pr_debug("trx image exceeds MTD device \"%s\"\n",
|
|
master->name);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (trx_size == 0) {
|
|
pr_debug("no trx header found in \"%s\"\n", master->name);
|
|
ret = -ENODEV;
|
|
goto err;
|
|
}
|
|
|
|
trx_offset = offset + hdr.offset[0];
|
|
rootfs_offset = offset + hdr.offset[1];
|
|
rootfs_size = master->size - rootfs_offset;
|
|
trx_size = rootfs_offset - trx_offset;
|
|
|
|
if (rootfs_size == 0) {
|
|
pr_debug("no rootfs found in \"%s\"\n", master->name);
|
|
ret = -ENODEV;
|
|
goto err;
|
|
}
|
|
|
|
parts[0].name = KERNEL_PART_NAME;
|
|
parts[0].offset = trx_offset;
|
|
parts[0].size = trx_size;
|
|
|
|
parts[1].name = ROOTFS_PART_NAME;
|
|
parts[1].offset = rootfs_offset;
|
|
parts[1].size = rootfs_size;
|
|
|
|
*pparts = parts;
|
|
return nr_parts;
|
|
|
|
err:
|
|
kfree(parts);
|
|
return ret;
|
|
}
|
|
|
|
static struct mtd_part_parser trx_parser = {
|
|
.owner = THIS_MODULE,
|
|
.name = "trx-fw",
|
|
.parse_fn = mtdsplit_parse_trx,
|
|
.type = MTD_PARSER_TYPE_FIRMWARE,
|
|
};
|
|
|
|
static int __init mtdsplit_trx_init(void)
|
|
{
|
|
register_mtd_parser(&trx_parser);
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(mtdsplit_trx_init);
|