On 5/12/22 04:29, AKASHI Takahiro wrote:
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.aka...@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;
Reviewed-by: Heinrich Schuchardt <xypron.g...@gmx.de>
+}
+
enum efi_disk_direction {
EFI_DISK_READ,
EFI_DISK_WRITE,
