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284 lines
7.1 KiB
C
284 lines
7.1 KiB
C
/*
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* Copyright (C) 2018 Paweł Dembicki <paweldembicki@gmail.com>
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*
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* Based on: mtdsplit_uimage.c
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* Copyright (C) 2013 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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#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/vmalloc.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 MAX_HEADER_LEN ( STAG_SIZE + SCH2_SIZE )
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#define STAG_SIZE 16
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#define STAG_ID 0x04
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#define STAG_MAGIC 0x2B24
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#define SCH2_SIZE 40
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#define SCH2_MAGIC 0x2124
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#define SCH2_VER 0x02
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/*
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* Jboot image header,
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* all data in little endian.
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*/
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struct jimage_header //stag + sch2 jboot joined headers
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{
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uint8_t stag_cmark; // in factory 0xFF , in sysupgrade must be the same as stag_id
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uint8_t stag_id; // 0x04
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uint16_t stag_magic; //magic 0x2B24
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uint32_t stag_time_stamp; // timestamp calculated in jboot way
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uint32_t stag_image_length; // lentgh of kernel + sch2 header
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uint16_t stag_image_checksum; // negated jboot_checksum of sch2 + kernel
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uint16_t stag_tag_checksum; // negated jboot_checksum of stag header data
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uint16_t sch2_magic; // magic 0x2124
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uint8_t sch2_cp_type; // 0x00 for flat, 0x01 for jz, 0x02 for gzip, 0x03 for lzma
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uint8_t sch2_version; // 0x02 for sch2
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uint32_t sch2_ram_addr; // ram entry address
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uint32_t sch2_image_len; // kernel image length
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uint32_t sch2_image_crc32; // kernel image crc
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uint32_t sch2_start_addr; // ram start address
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uint32_t sch2_rootfs_addr; // rootfs flash address
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uint32_t sch2_rootfs_len; // rootfls length
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uint32_t sch2_rootfs_crc32; // rootfs crc32
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uint32_t sch2_header_crc32; // sch2 header crc32, durring calculation this area is replaced by zero
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uint16_t sch2_header_length; // sch2 header length: 0x28
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uint16_t sch2_cmd_line_length; // cmd line length, known zeros
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};
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static int
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read_jimage_header(struct mtd_info *mtd, size_t offset, u_char *buf,
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size_t header_len)
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{
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size_t retlen;
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int ret;
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ret = mtd_read(mtd, offset, header_len, &retlen, buf);
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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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/**
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* __mtdsplit_parse_jimage - scan partition and create kernel + rootfs parts
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*
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* @find_header: function to call for a block of data that will return offset
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* of a valid jImage header if found
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*/
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static int __mtdsplit_parse_jimage(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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ssize_t (*find_header)(u_char *buf, size_t len))
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{
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struct mtd_partition *parts;
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u_char *buf;
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int nr_parts;
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size_t offset;
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size_t jimage_offset;
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size_t jimage_size = 0;
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size_t rootfs_offset;
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size_t rootfs_size = 0;
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int jimage_part, rf_part;
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int ret;
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enum mtdsplit_part_type type;
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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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buf = vmalloc(MAX_HEADER_LEN);
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if (!buf) {
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ret = -ENOMEM;
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goto err_free_parts;
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}
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/* find jImage on erase block boundaries */
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for (offset = 0; offset < master->size; offset += master->erasesize) {
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struct jimage_header *header;
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jimage_size = 0;
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ret = read_jimage_header(master, offset, buf, MAX_HEADER_LEN);
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if (ret)
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continue;
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ret = find_header(buf, MAX_HEADER_LEN);
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if (ret < 0) {
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pr_debug("no valid jImage 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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header = (struct jimage_header *)(buf + ret);
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jimage_size = sizeof(*header) + header->sch2_image_len + ret;
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if ((offset + jimage_size) > master->size) {
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pr_debug("jImage 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 (jimage_size == 0) {
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pr_debug("no jImage found in \"%s\"\n", master->name);
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ret = -ENODEV;
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goto err_free_buf;
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}
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jimage_offset = offset;
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if (jimage_offset == 0) {
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jimage_part = 0;
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rf_part = 1;
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/* find the roots after the jImage */
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ret = mtd_find_rootfs_from(master, jimage_offset + jimage_size,
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master->size, &rootfs_offset, &type);
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if (ret) {
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pr_debug("no rootfs after jImage in \"%s\"\n",
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master->name);
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goto err_free_buf;
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}
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rootfs_size = master->size - rootfs_offset;
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jimage_size = rootfs_offset - jimage_offset;
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} else {
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rf_part = 0;
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jimage_part = 1;
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/* check rootfs presence at offset 0 */
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ret = mtd_check_rootfs_magic(master, 0, &type);
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if (ret) {
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pr_debug("no rootfs before jImage in \"%s\"\n",
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master->name);
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goto err_free_buf;
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}
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rootfs_offset = 0;
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rootfs_size = jimage_offset;
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}
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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_free_buf;
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}
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parts[jimage_part].name = KERNEL_PART_NAME;
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parts[jimage_part].offset = jimage_offset;
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parts[jimage_part].size = jimage_size;
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if (type == MTDSPLIT_PART_TYPE_UBI)
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parts[rf_part].name = UBI_PART_NAME;
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else
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parts[rf_part].name = ROOTFS_PART_NAME;
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parts[rf_part].offset = rootfs_offset;
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parts[rf_part].size = rootfs_size;
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vfree(buf);
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*pparts = parts;
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return nr_parts;
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err_free_buf:
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vfree(buf);
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err_free_parts:
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kfree(parts);
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return ret;
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}
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static ssize_t jimage_verify_default(u_char *buf, size_t len)
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{
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struct jimage_header *header = (struct jimage_header *)buf;
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/* default sanity checks */
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if (header->stag_magic != STAG_MAGIC) {
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pr_debug("invalid jImage stag header magic: %04x\n",
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header->stag_magic);
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return -EINVAL;
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}
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if (header->sch2_magic != SCH2_MAGIC) {
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pr_debug("invalid jImage sch2 header magic: %04x\n",
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header->stag_magic);
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return -EINVAL;
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}
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if (header->stag_cmark != header->stag_id) {
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pr_debug("invalid jImage stag header cmark: %02x\n",
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header->stag_magic);
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return -EINVAL;
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}
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if (header->stag_id != STAG_ID) {
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pr_debug("invalid jImage stag header id: %02x\n",
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header->stag_magic);
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return -EINVAL;
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}
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if (header->sch2_version != SCH2_VER) {
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pr_debug("invalid jImage sch2 header version: %02x\n",
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header->stag_magic);
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return -EINVAL;
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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_jimage_parse_generic(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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return __mtdsplit_parse_jimage(master, pparts, data,
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jimage_verify_default);
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}
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static const struct of_device_id mtdsplit_jimage_of_match_table[] = {
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{ .compatible = "amit,jimage" },
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{},
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};
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static struct mtd_part_parser jimage_generic_parser = {
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.owner = THIS_MODULE,
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.name = "jimage-fw",
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.of_match_table = mtdsplit_jimage_of_match_table,
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.parse_fn = mtdsplit_jimage_parse_generic,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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/**************************************************
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* Init
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**************************************************/
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static int __init mtdsplit_jimage_init(void)
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{
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register_mtd_parser(&jimage_generic_parser);
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return 0;
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}
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module_init(mtdsplit_jimage_init);
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