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efi_loader: disk: add efi_disk_is_system_part()

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This function will check if a given handle to device is an EFI system
partition. It will be utilised in implementing capsule-on-disk feature.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Add function description. Return bool.
Reviewed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
AKASHI Takahiro 2020-04-27 18:48:20 +09:00 committed by Heinrich Schuchardt
parent f0ff75f249
commit 41fd506842
2 changed files with 31 additions and 0 deletions
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2
include/efi_loader.h
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@ -394,6 +394,8 @@ efi_status_t efi_disk_register(void);
int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
const char *if_typename, int diskid,
const char *pdevname);
/* Check if it is EFI system partition */
bool efi_disk_is_system_part(efi_handle_t handle);
/* Called by bootefi to make GOP (graphical) interface available */
efi_status_t efi_gop_register(void);
/* Called by bootefi to make the network interface available */

29
lib/efi_loader/efi_disk.c
View File

@ -588,3 +588,32 @@ efi_status_t efi_disk_register(void)
return EFI_SUCCESS;
}
/**
* efi_disk_is_system_part() - check if handle refers to an EFI system partition
*
* @handle: handle of partition
*
* Return: true if handle refers to an EFI system partition
*/
bool efi_disk_is_system_part(efi_handle_t handle)
{
struct efi_handler *handler;
struct efi_disk_obj *diskobj;
disk_partition_t info;
efi_status_t ret;
int r;
/* check if this is a block device */
ret = efi_search_protocol(handle, &efi_block_io_guid, &handler);
if (ret != EFI_SUCCESS)
return false;
diskobj = container_of(handle, struct efi_disk_obj, header);
r = part_get_info(diskobj->desc, diskobj->part, &info);
if (r)
return false;
return !!(info.bootable & PART_EFI_SYSTEM_PARTITION);
}