/**
* __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;
}
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;
}