vulcanos/kernel/libc/time.c
2021-02-03 15:59:42 +01:00

39 lines
985 B
C

#include "time.h"
#include "../drivers/ports.h"
// Check whether CMOS is updated or not
static uint8_t is_cmos_updated() {
outb(CMOS_ADDRESS, 0x0A);
return (inb(CMOS_DATA) & 0x80);
}
// Get CMOS register's status
static uint8_t reg_status(int32_t reg) {
outb(CMOS_ADDRESS, reg);
return inb(CMOS_DATA);
}
time_t cmos_reader() {
while(is_cmos_updated()); // Wait until the CMOS is being updated
time_t tm;
tm.second = BCD_CONVERTER(reg_status(TIME_R_SECOND));
tm.minute = BCD_CONVERTER(reg_status(TIME_R_MINUTE));
tm.hour = BCD_CONVERTER(reg_status(TIME_R_HOUR));
tm.day = BCD_CONVERTER(reg_status(TIME_R_DAY));
tm.month = BCD_CONVERTER(reg_status(TIME_R_MONTH));
tm.year = BCD_CONVERTER(reg_status(TIME_R_YEAR));
return tm;
}
uint32_t get_time(uint32_t field) {
while(is_cmos_updated()); // Wait the CMOS is being updated
return BCD_CONVERTER(reg_status(field));
}