96 lines
2 KiB
C
96 lines
2 KiB
C
/*
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* Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <asm/unaligned.h>
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#include "mtdsplit.h"
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#define LZMA_NR_PARTS 2
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#define LZMA_PROPERTIES_SIZE 5
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struct lzma_header {
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u8 props[LZMA_PROPERTIES_SIZE];
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u8 size_low[4];
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u8 size_high[4];
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};
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static int mtdsplit_parse_lzma(struct mtd_info *master,
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const struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct lzma_header hdr;
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size_t hdr_len, retlen;
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size_t rootfs_offset;
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u32 t;
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struct mtd_partition *parts;
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int err;
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hdr_len = sizeof(hdr);
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err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
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if (err)
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return err;
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if (retlen != hdr_len)
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return -EIO;
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/* verify LZMA properties */
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if (hdr.props[0] >= (9 * 5 * 5))
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return -EINVAL;
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t = get_unaligned_le32(&hdr.props[1]);
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if (!is_power_of_2(t))
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return -EINVAL;
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t = get_unaligned_le32(&hdr.size_high);
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if (t)
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return -EINVAL;
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err = mtd_find_rootfs_from(master, master->erasesize, master->size,
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&rootfs_offset, NULL);
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if (err)
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return err;
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parts = kzalloc(LZMA_NR_PARTS * sizeof(*parts), GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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parts[0].name = KERNEL_PART_NAME;
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parts[0].offset = 0;
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parts[0].size = rootfs_offset;
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parts[1].name = ROOTFS_PART_NAME;
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parts[1].offset = rootfs_offset;
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parts[1].size = master->size - rootfs_offset;
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*pparts = parts;
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return LZMA_NR_PARTS;
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}
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static struct mtd_part_parser mtdsplit_lzma_parser = {
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.owner = THIS_MODULE,
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.name = "lzma-fw",
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.parse_fn = mtdsplit_parse_lzma,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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static int __init mtdsplit_lzma_init(void)
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{
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register_mtd_parser(&mtdsplit_lzma_parser);
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return 0;
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}
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subsys_initcall(mtdsplit_lzma_init);
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