rtc.c

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#include <core/rtc.h>
#include <string.h>
void get_time(int *hours, int *minutes, int *seconds)
{
    char temp = 0;
    outb(RTC_INDEX_REG, SECONDS_INDEX);
    temp = inb(0x71);
    *seconds = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, MINUTES_INDEX);
    temp = inb(0x71);
    *minutes = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, HOURS_INDEX);
    temp = inb(0x71);
    *hours = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);
}

void set_time(int hours, int minutes, int seconds)
{
    sti();

    outb(RTC_INDEX_REG, HOURS_INDEX);
    outb(RTC_DATA_REG, ((hours/10)<<4)|(hours%10) );

    outb(RTC_INDEX_REG, MINUTES_INDEX);
    outb(RTC_DATA_REG, ((minutes/10)<<4)|(minutes%10) );

    outb(RTC_INDEX_REG, SECONDS_INDEX);
    outb(RTC_DATA_REG, ((seconds/10)<<4)|(seconds%10) );

    cli();
}

void get_date(int *day, int *month, int *year)
{
    char temp = 0;
    outb(RTC_INDEX_REG, DAY_OF_MONTH_INDEX);
    temp = inb(0x71);
    *day = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, MONTHS_INDEX);
    temp = inb(0x71);
    *month = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, YEAR_INDEX);
    temp = inb(0x71);
    *year = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);
}

void set_date(int day, int month, int year)
{
    sti();

    outb(RTC_INDEX_REG, DAY_OF_MONTH_INDEX);
    outb(RTC_DATA_REG, ((day/10)<<4)|(day%10));

    outb(RTC_INDEX_REG, MONTHS_INDEX);
    outb(RTC_DATA_REG, ((month/10)<<4)|(month%10));

    outb(RTC_INDEX_REG, YEAR_INDEX);
    outb(RTC_DATA_REG, (((year-(year/100)*100)/10)<<4)|(year%10) );

    cli();
}