diff --git a/kern/rtc.h b/kern/rtc.h
index 74ceb38..b33c748 100644
--- a/kern/rtc.h
+++ b/kern/rtc.h
@@ -3,6 +3,14 @@
 
 #include <stdint.h>
 
+struct rtc_class_ops {
+    uint64_t (*read_time)(void);
+    void     (*set_time)(uint64_t);
+    uint64_t (*read_alarm)(uint64_t);
+    void     (*set_alarm)(uint64_t);
+    void     (*alarm_irq_enable)(void);
+};
+
 uint64_t rtc_time_read(void);
 void     rtc_time_set(uint64_t ns);