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