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#include <kernel/system.h>
#include <kernel/io/io.h>
#include <kernel/acpi/acpi.h>
#include <kernel/lib/stdio.h>
uint8_t second;
uint8_t minute;
uint8_t hour;
uint8_t day;
uint8_t month;
unsigned int year;
int get_update_in_progress_flag()
{
outb(0x70, 0x0A);
return (inb(0x71) & 0x80);
}
uint8_t get_rtc_register(int reg)
{
outb(0x70, (uint8_t)reg);
return inb(0x71);
}
void read_rtc()
{
unsigned int century = 20; // ...
uint8_t last_second;
uint8_t last_minute;
uint8_t last_hour;
uint8_t last_day;
uint8_t last_month;
uint8_t last_year;
uint8_t last_century;
uint8_t registerB;
while (get_update_in_progress_flag()) {
};
second = get_rtc_register(0x00);
minute = get_rtc_register(0x02);
hour = get_rtc_register(0x04);
day = get_rtc_register(0x07);
month = get_rtc_register(0x08);
year = get_rtc_register(0x09);
century = get_rtc_register(fadt->century);
// Try until the values are the same (fix for RTC updates)
do {
last_second = second;
last_minute = minute;
last_hour = hour;
last_day = day;
last_month = month;
last_year = (uint8_t)year;
last_century = (uint8_t)century;
while (get_update_in_progress_flag()) {
};
second = get_rtc_register(0x00);
minute = get_rtc_register(0x02);
hour = get_rtc_register(0x04);
day = get_rtc_register(0x07);
month = get_rtc_register(0x08);
year = get_rtc_register(0x09);
century = get_rtc_register(fadt->century);
} while ((last_second != second) || (last_minute != minute) || (last_hour != hour) ||
(last_day != day) || (last_month != month) || (last_year != year) ||
(last_century != century));
registerB = get_rtc_register(0x0B);
if (!(registerB & 0x04)) {
second = (uint8_t)((second & 0x0F) + ((second / 16) * 10));
minute = (uint8_t)((minute & 0x0F) + ((minute / 16) * 10));
hour = (uint8_t)(((hour & 0x0F) + (((hour & 0x70) / 16) * 10)) | (hour & 0x80));
day = (uint8_t)((day & 0x0F) + ((day / 16) * 10));
month = (uint8_t)((month & 0x0F) + ((month / 16) * 10));
year = (year & 0x0F) + ((year / 16) * 10);
century = (century & 0x0F) + ((century / 16) * 10);
}
year += century * 100;
// Convert to 24h if necessary
if (!(registerB & 0x02) && (hour & 0x80)) {
hour = (uint8_t)(((hour & 0x7F) + 12) % 24);
}
}
void rtc_print()
{
read_rtc();
info("Current time: %d:%d:%d %d/%d/%d", hour, minute, second, month, day, year);
}
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