-efi_status_t EFIAPI efi_get_variable(s16 *variable_name,
- efi_guid_t *vendor, u32 *attributes,
- unsigned long *data_size, void *data);
-efi_status_t EFIAPI efi_get_next_variable(
- unsigned long *variable_name_size,
- s16 *variable_name, efi_guid_t *vendor);
-efi_status_t EFIAPI efi_set_variable(s16 *variable_name,
- efi_guid_t *vendor, u32 attributes,
- unsigned long data_size, void *data);
+efi_status_t EFIAPI efi_get_variable(u16 *variable_name,
+ const efi_guid_t *vendor, u32 *attributes,
+ efi_uintn_t *data_size, void *data);
+efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
+ u16 *variable_name,
+ const efi_guid_t *vendor);
+efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
+ const efi_guid_t *vendor, u32 attributes,
+ efi_uintn_t data_size, const void *data);
+
+/*
+ * See section 3.1.3 in the v2.7 UEFI spec for more details on
+ * the layout of EFI_LOAD_OPTION. In short it is:
+ *
+ * typedef struct _EFI_LOAD_OPTION {
+ * UINT32 Attributes;
+ * UINT16 FilePathListLength;
+ * // CHAR16 Description[]; <-- variable length, NULL terminated
+ * // EFI_DEVICE_PATH_PROTOCOL FilePathList[];
+ * <-- FilePathListLength bytes
+ * // UINT8 OptionalData[];
+ * } EFI_LOAD_OPTION;
+ */
+struct efi_load_option {
+ u32 attributes;
+ u16 file_path_length;
+ u16 *label;
+ struct efi_device_path *file_path;
+ u8 *optional_data;
+};