efi_event
efi_status (*bs_registerprotocolnotify)(struct uuid *, efi_event,
efi_event_notify, void *, struct uuid, efi_event *);
typedef void (*efi_event_notify)(efi_event, void *);
void *, efi_event *);
efi_status (*bs_settimer)(efi_event, uint32_t, uint64_t);
efi_status (*bs_waitforevent)(uintn, efi_event *, uintn *);
efi_status (*bs_signalevent)(efi_event);
efi_status (*bs_closeevent)(efi_event);
efi_status (*bs_checkevent)(efi_event);