예제 #1
0
/**
 * __mtdsplit_parse_uimage - scan partition and create kernel + rootfs parts
 *
 * @find_header: function to call for a block of data that will return offset
 *      of a valid uImage header if found
 */
static int __mtdsplit_parse_uimage(struct mtd_info *master,
				   struct mtd_partition **pparts,
				   struct mtd_part_parser_data *data,
				   ssize_t (*find_header)(u_char *buf, size_t len))
{
	struct mtd_partition *parts;
	u_char *buf;
	int nr_parts;
	size_t offset;
	size_t uimage_offset;
	size_t uimage_size = 0;
	size_t rootfs_offset;
	size_t rootfs_size = 0;
	int uimage_part, rf_part;
	int ret;
	enum mtdsplit_part_type type;

	nr_parts = 2;
	parts = kzalloc(nr_parts * sizeof(*parts), GFP_KERNEL);
	if (!parts)
		return -ENOMEM;

	buf = vmalloc(MAX_HEADER_LEN);
	if (!buf) {
		ret = -ENOMEM;
		goto err_free_parts;
	}

	/* find uImage on erase block boundaries */
	for (offset = 0; offset < master->size; offset += master->erasesize) {
		struct uimage_header *header;

		uimage_size = 0;

		ret = read_uimage_header(master, offset, buf, MAX_HEADER_LEN);
		if (ret)
			continue;

		ret = find_header(buf, MAX_HEADER_LEN);
		if (ret < 0) {
			pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
				 master->name, (unsigned long long) offset);
			continue;
		}
		header = (struct uimage_header *)(buf + ret);

		uimage_size = sizeof(*header) + be32_to_cpu(header->ih_size) + ret;
		if ((offset + uimage_size) > master->size) {
			pr_debug("uImage exceeds MTD device \"%s\"\n",
				 master->name);
			continue;
		}
		break;
	}

	if (uimage_size == 0) {
		pr_debug("no uImage found in \"%s\"\n", master->name);
		ret = -ENODEV;
		goto err_free_buf;
	}

	uimage_offset = offset;

	if (uimage_offset == 0) {
		uimage_part = 0;
		rf_part = 1;

		/* find the roots after the uImage */
		ret = mtd_find_rootfs_from(master, uimage_offset + uimage_size,
					   master->size, &rootfs_offset, &type);
		if (ret) {
			pr_debug("no rootfs after uImage in \"%s\"\n",
				 master->name);
			goto err_free_buf;
		}

		rootfs_size = master->size - rootfs_offset;
		uimage_size = rootfs_offset - uimage_offset;
	} else {
		rf_part = 0;
		uimage_part = 1;

		/* check rootfs presence at offset 0 */
		ret = mtd_check_rootfs_magic(master, 0, &type);
		if (ret) {
			pr_debug("no rootfs before uImage in \"%s\"\n",
				 master->name);
			goto err_free_buf;
		}

		rootfs_offset = 0;
		rootfs_size = uimage_offset;
	}

	if (rootfs_size == 0) {
		pr_debug("no rootfs found in \"%s\"\n", master->name);
		ret = -ENODEV;
		goto err_free_buf;
	}

	parts[uimage_part].name = KERNEL_PART_NAME;
	parts[uimage_part].offset = uimage_offset;
	parts[uimage_part].size = uimage_size;

	if (type == MTDSPLIT_PART_TYPE_UBI)
		parts[rf_part].name = UBI_PART_NAME;
	else
		parts[rf_part].name = ROOTFS_PART_NAME;
	parts[rf_part].offset = rootfs_offset;
	parts[rf_part].size = rootfs_size;

	vfree(buf);

	*pparts = parts;
	return nr_parts;

err_free_buf:
	vfree(buf);

err_free_parts:
	kfree(parts);
	return ret;
}
예제 #2
0
static int __mtdsplit_parse_uimage(struct mtd_info *master,
                                   struct mtd_partition **pparts,
                                   struct mtd_part_parser_data *data,
                                   bool (*verify)(struct uimage_header *hdr))
{
    struct mtd_partition *parts;
    struct uimage_header *header;
    int nr_parts;
    size_t offset;
    size_t uimage_offset;
    size_t uimage_size = 0;
    size_t rootfs_offset;
    size_t rootfs_size = 0;
    int uimage_part, rf_part;
    int ret;

    nr_parts = 2;
    parts = kzalloc(nr_parts * sizeof(*parts), GFP_KERNEL);
    if (!parts)
        return -ENOMEM;

    header = vmalloc(sizeof(*header));
    if (!header) {
        ret = -ENOMEM;
        goto err_free_parts;
    }

    /* find uImage on erase block boundaries */
    for (offset = 0; offset < master->size; offset += master->erasesize) {
        uimage_size = 0;

        ret = read_uimage_header(master, offset, header);
        if (ret)
            continue;

        if (!verify(header)) {
            pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
                     master->name, (unsigned long long) offset);
            continue;
        }

        uimage_size = sizeof(*header) + be32_to_cpu(header->ih_size);
        if ((offset + uimage_size) > master->size) {
            pr_debug("uImage exceeds MTD device \"%s\"\n",
                     master->name);
            continue;
        }
        break;
    }

    if (uimage_size == 0) {
        pr_debug("no uImage found in \"%s\"\n", master->name);
        ret = -ENODEV;
        goto err_free_header;
    }

    uimage_offset = offset;

    if (uimage_offset == 0) {
        uimage_part = 0;
        rf_part = 1;

        /* find the roots after the uImage */
        ret = mtd_find_rootfs_from(master,
                                   uimage_offset + uimage_size,
                                   master->size,
                                   &rootfs_offset);
        if (ret) {
            pr_debug("no rootfs after uImage in \"%s\"\n",
                     master->name);
            goto err_free_header;
        }

        rootfs_size = master->size - rootfs_offset;
        uimage_size = rootfs_offset - uimage_offset;
    } else {
        rf_part = 0;
        uimage_part = 1;

        /* check rootfs presence at offset 0 */
        ret = mtd_check_rootfs_magic(master, 0);
        if (ret) {
            pr_debug("no rootfs before uImage in \"%s\"\n",
                     master->name);
            goto err_free_header;
        }

        rootfs_offset = 0;
        rootfs_size = uimage_offset;
    }

    if (rootfs_size == 0) {
        pr_debug("no rootfs found in \"%s\"\n", master->name);
        ret = -ENODEV;
        goto err_free_header;
    }

    parts[uimage_part].name = KERNEL_PART_NAME;
    parts[uimage_part].offset = uimage_offset;
    parts[uimage_part].size = uimage_size;

    parts[rf_part].name = ROOTFS_PART_NAME;
    parts[rf_part].offset = rootfs_offset;
    parts[rf_part].size = rootfs_size;

    vfree(header);

    *pparts = parts;
    return nr_parts;

err_free_header:
    vfree(header);

err_free_parts:
    kfree(parts);
    return ret;
}