96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2012 John Crispin <blogic@openwrt.org>
|
|
* Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
|
|
*
|
|
* 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 <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 EVA_NR_PARTS 2
|
|
#define EVA_MAGIC 0xfeed1281
|
|
#define EVA_FOOTER_SIZE 0x18
|
|
#define EVA_DUMMY_SQUASHFS_SIZE 0x100
|
|
|
|
struct eva_image_header {
|
|
uint32_t magic;
|
|
uint32_t size;
|
|
};
|
|
|
|
static int mtdsplit_parse_eva(struct mtd_info *master,
|
|
const struct mtd_partition **pparts,
|
|
struct mtd_part_parser_data *data)
|
|
{
|
|
struct mtd_partition *parts;
|
|
struct eva_image_header hdr;
|
|
size_t retlen;
|
|
unsigned long kernel_size, rootfs_offset;
|
|
int err;
|
|
|
|
err = mtd_read(master, 0, sizeof(hdr), &retlen, (void *) &hdr);
|
|
if (err)
|
|
return err;
|
|
|
|
if (retlen != sizeof(hdr))
|
|
return -EIO;
|
|
|
|
if (le32_to_cpu(hdr.magic) != EVA_MAGIC)
|
|
return -EINVAL;
|
|
|
|
kernel_size = le32_to_cpu(hdr.size) + EVA_FOOTER_SIZE;
|
|
|
|
/* rootfs starts at the next 0x10000 boundary: */
|
|
rootfs_offset = round_up(kernel_size, 0x10000);
|
|
|
|
/* skip the dummy EVA squashfs partition (with wrong endianness): */
|
|
rootfs_offset += EVA_DUMMY_SQUASHFS_SIZE;
|
|
|
|
if (rootfs_offset >= master->size)
|
|
return -EINVAL;
|
|
|
|
err = mtd_check_rootfs_magic(master, rootfs_offset, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
parts = kzalloc(EVA_NR_PARTS * sizeof(*parts), GFP_KERNEL);
|
|
if (!parts)
|
|
return -ENOMEM;
|
|
|
|
parts[0].name = KERNEL_PART_NAME;
|
|
parts[0].offset = 0;
|
|
parts[0].size = kernel_size;
|
|
|
|
parts[1].name = ROOTFS_PART_NAME;
|
|
parts[1].offset = rootfs_offset;
|
|
parts[1].size = master->size - rootfs_offset;
|
|
|
|
*pparts = parts;
|
|
return EVA_NR_PARTS;
|
|
}
|
|
|
|
static struct mtd_part_parser mtdsplit_eva_parser = {
|
|
.owner = THIS_MODULE,
|
|
.name = "eva-fw",
|
|
.parse_fn = mtdsplit_parse_eva,
|
|
.type = MTD_PARSER_TYPE_FIRMWARE,
|
|
};
|
|
|
|
static int __init mtdsplit_eva_init(void)
|
|
{
|
|
register_mtd_parser(&mtdsplit_eva_parser);
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(mtdsplit_eva_init);
|