e1491b341b
Our mtdsplit parsers may want to create partition with name choice based on partition file system (e.g. SquashFS vs. JFFS2). This patch allows passing extra argument pointing to variable that will be set properly. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 48598
96 lines
2.2 KiB
C
96 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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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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