add: rtc support

headers/rtc.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <stdint.h>
+
+#define SECOND_REGISTER 0x00
+#define MINUTE_REGISTER 0x02
+#define HOUR_REGISTER 0x04
+#define DAY_OF_THE_MONTH_REGISTER 0x07
+#define MONTH_REGISTER 0x08
+#define YEAR_REGISTER 0x09
+#define CENTURY_REGISTER 0x32
+
+#define REGISTER_A 0x0A
+#define REGISTER_B 0x0B
+
+enum {
+      CMOS_ADDRESS = 0x70,
+      CMOS_DATA    = 0x71
+};
+
+struct rtc_date {
+    uint8_t second;
+    uint8_t minute;
+    uint8_t hour;
+
+    uint8_t index_of_the_day;
+    uint8_t day;
+    uint8_t month;
+    uint32_t year;
+};
+
+struct rtc_date get_date(void);