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mtdsplit_uimage: more generic header verify function

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Some devices have uImage headers after some extra headers (e.g. Edimax
devices). To support such cases our verify callback function should be
allowed to return header offset, not just a boolean value.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 44412
This commit is contained in:
Rafał Miłecki 2015-02-12 06:57:24 +00:00
parent 1f3cdb8634
commit 1aed104c80
1 changed files with 26 additions and 11 deletions
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37
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
View file

@ -71,10 +71,16 @@ read_uimage_header(struct mtd_info *mtd, size_t offset,
return 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,
bool (*verify)(struct uimage_header *hdr))
ssize_t (*find_header)(u_char *buf, size_t len))
{
struct mtd_partition *parts;
struct uimage_header *header;
@ -106,11 +112,16 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (ret)
continue;
if (!verify(header)) {
ret = find_header((u_char *)header, sizeof(*header));
if (ret < 0) {
pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
master->name, (unsigned long long) offset);
continue;
}
if (ret > 0) {
pr_warn("extra header offsets are not supported yet\n");
continue;
}
uimage_size = sizeof(*header) + be32_to_cpu(header->ih_size);
if ((offset + uimage_size) > master->size) {
@ -189,28 +200,30 @@ err_free_parts:
return ret;
}
static bool uimage_verify_default(struct uimage_header *header)
static ssize_t uimage_verify_default(u_char *buf, size_t len)
{
struct uimage_header *header = (struct uimage_header *)buf;
/* default sanity checks */
if (be32_to_cpu(header->ih_magic) != IH_MAGIC) {
pr_debug("invalid uImage magic: %08x\n",
be32_to_cpu(header->ih_magic));
return false;
return -EINVAL;
}
if (header->ih_os != IH_OS_LINUX) {
pr_debug("invalid uImage OS: %08x\n",
be32_to_cpu(header->ih_os));
return false;
return -EINVAL;
}
if (header->ih_type != IH_TYPE_KERNEL) {
pr_debug("invalid uImage type: %08x\n",
be32_to_cpu(header->ih_type));
return false;
return -EINVAL;
}
return true;
return 0;
}
static int
@ -238,9 +251,11 @@ static struct mtd_part_parser uimage_generic_parser = {
#define FW_MAGIC_WNDR3700 0x33373030
#define FW_MAGIC_WNDR3700V2 0x33373031
static bool uimage_verify_wndr3700(struct uimage_header *header)
static ssize_t uimage_verify_wndr3700(u_char *buf, size_t len)
{
struct uimage_header *header = (struct uimage_header *)buf;
uint8_t expected_type = IH_TYPE_FILESYSTEM;
switch be32_to_cpu(header->ih_magic) {
case FW_MAGIC_WNR612V2:
case FW_MAGIC_WNR1000V2:
@ -254,14 +269,14 @@ static bool uimage_verify_wndr3700(struct uimage_header *header)
expected_type = IH_TYPE_KERNEL;
break;
default:
return false;
return -EINVAL;
}
if (header->ih_os != IH_OS_LINUX ||
header->ih_type != expected_type)
return false;
return -EINVAL;
return true;
return 0;
}
static int