forked from Bananymous/banan-os
90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
#include <kernel/IO.h>
|
|
#include <kernel/RTC.h>
|
|
|
|
#include <string.h>
|
|
|
|
#define CURRENT_YEAR 2022
|
|
|
|
#define CMOS_ADDRESS 0x70
|
|
#define CMOS_DATA 0x71
|
|
|
|
#define CMOS_REGISTER_SECOND 0x00
|
|
#define CMOS_REGISTER_MINUTE 0x02
|
|
#define CMOS_REGISTER_HOUR 0x04
|
|
#define CMOS_REGISTER_WEEK_DAY 0x06
|
|
#define CMOS_REGISTER_DAY 0x07
|
|
#define CMOS_REGISTER_MONTH 0x08
|
|
#define CMOS_REGISTER_YEAR 0x09
|
|
#define CMOS_REGISTER_STATUS_1 0x0A
|
|
#define CMOS_REGISTER_STATUS_2 0x0B
|
|
|
|
namespace RTC
|
|
{
|
|
|
|
static bool get_update_in_progress()
|
|
{
|
|
IO::outb(CMOS_ADDRESS, CMOS_REGISTER_STATUS_1);
|
|
return IO::inb(CMOS_DATA) & 0x80;
|
|
}
|
|
|
|
static uint8_t get_rtc_register(uint8_t reg)
|
|
{
|
|
IO::outb(CMOS_ADDRESS, reg);
|
|
return IO::inb(CMOS_DATA);
|
|
}
|
|
|
|
static void get_time(BAN::Time& out)
|
|
{
|
|
out.second = get_rtc_register(CMOS_REGISTER_SECOND);
|
|
out.minute = get_rtc_register(CMOS_REGISTER_MINUTE);
|
|
out.hour = get_rtc_register(CMOS_REGISTER_HOUR);
|
|
out.week_day = get_rtc_register(CMOS_REGISTER_WEEK_DAY);
|
|
out.day = get_rtc_register(CMOS_REGISTER_DAY);
|
|
out.month = get_rtc_register(CMOS_REGISTER_MONTH);
|
|
out.year = get_rtc_register(CMOS_REGISTER_YEAR);
|
|
}
|
|
|
|
BAN::Time get_current_time()
|
|
{
|
|
BAN::Time last_time = {};
|
|
BAN::Time time = {};
|
|
|
|
while (get_update_in_progress())
|
|
continue;
|
|
|
|
get_time(time);
|
|
last_time.second = time.second + 1;
|
|
|
|
while (memcmp(&last_time, &time, sizeof(BAN::Time)))
|
|
{
|
|
last_time = time;
|
|
get_time(time);
|
|
}
|
|
|
|
uint8_t regB = get_rtc_register(0x0B);
|
|
|
|
// Convert BCD to binary values if necessary
|
|
if (!(regB & 0x04))
|
|
{
|
|
time.second = (time.second & 0x0F) + ((time.second / 16) * 10);
|
|
time.minute = (time.minute & 0x0F) + ((time.minute / 16) * 10);
|
|
time.hour = ((time.hour & 0x0F) + (((time.hour & 0x70) / 16) * 10) ) | (time.hour & 0x80);
|
|
time.week_day = (time.week_day & 0x0F) + ((time.week_day / 16) * 10);
|
|
time.day = (time.day & 0x0F) + ((time.day / 16) * 10);
|
|
time.month = (time.month & 0x0F) + ((time.month / 16) * 10);
|
|
time.year = (time.year & 0x0F) + ((time.year / 16) * 10);
|
|
}
|
|
|
|
// Convert 12 hour clock to 24 hour clock if necessary
|
|
if (!(regB & 0x02) && (time.hour & 0x80))
|
|
time.hour = ((time.hour & 0x7F) + 12) % 24;
|
|
|
|
// Calculate the full 4 digit year
|
|
time.year += (CURRENT_YEAR / 100) * 100;
|
|
if (time.year < CURRENT_YEAR)
|
|
time.year += 100;
|
|
|
|
return time;
|
|
}
|
|
|
|
} |