This helper function will be used to determine if the device is removable media, initially for handling a short-path loading.
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- include/efi_loader.h | 3 +++ lib/efi_loader/efi_disk.c | 27 +++++++++++++++++++++++++++ 2 files changed, 30 insertions(+)
diff --git a/include/efi_loader.h b/include/efi_loader.h index 40fbab816e2d..839184acb7ff 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -659,6 +659,9 @@ efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type, /* Call this to signal an event */ void efi_signal_event(struct efi_event *event);
+/* return true if the device is removable */ +bool efi_disk_is_removable(efi_handle_t handle); + /* open file system: */ struct efi_simple_file_system_protocol *efi_simple_file_system( struct blk_desc *desc, int part, struct efi_device_path *dp); diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c index f5b462fb164a..1e82f52dc070 100644 --- a/lib/efi_loader/efi_disk.c +++ b/lib/efi_loader/efi_disk.c @@ -73,6 +73,33 @@ static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this, return EFI_EXIT(EFI_SUCCESS); }
+/** + * efi_disk_is_removable() - check if the device is removable media + * @handle: efi object handle; + * + * Examine the device and determine if the device is a local block device + * and removable media. + * + * Return: true if removable, false otherwise + */ +bool efi_disk_is_removable(efi_handle_t handle) +{ + struct efi_handler *handler; + struct efi_block_io *io; + efi_status_t ret; + + ret = efi_search_protocol(handle, &efi_block_io_guid, &handler); + if (ret != EFI_SUCCESS) + return false; + + io = handler->protocol_interface; + + if (!io || !io->media) + return false; + + return (bool)io->media->removable_media; +} + enum efi_disk_direction { EFI_DISK_READ, EFI_DISK_WRITE,