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