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#include <lib.h>
#include <comus/asm.h>
#include <comus/time.h>
#define CMOS_WRITE_PORT 0x70
#define CMOS_READ_PORT 0x71
#define CMOS_REG_SEC 0x00
#define CMOS_REG_MIN 0x02
#define CMOS_REG_HOUR 0x04
#define CMOS_REG_WDAY 0x06
#define CMOS_REG_MDAY 0x07
#define CMOS_REG_MON 0x08
#define CMOS_REG_YEAR 0x09
#define CMOS_REG_CEN 0x32
static uint8_t cmos_read(uint8_t reg)
{
uint8_t hex, ret;
outb(CMOS_WRITE_PORT, reg);
hex = inb(CMOS_READ_PORT);
ret = hex & 0x0F;
ret += (hex & 0xF0) / 16 * 10;
return ret;
}
static int mday_offset[12] = { 0, 31, 59, 90, 120, 151,
181, 212, 243, 273, 304, 334 };
void gettime(struct time *time)
{
time->sec = cmos_read(CMOS_REG_SEC);
time->min = cmos_read(CMOS_REG_MIN);
time->hour = cmos_read(CMOS_REG_HOUR);
time->wday = cmos_read(CMOS_REG_WDAY) - 1;
time->mday = cmos_read(CMOS_REG_MDAY);
time->mon = cmos_read(CMOS_REG_MON) - 1;
time->yn = cmos_read(CMOS_REG_YEAR);
time->cen = 20;
time->year = time->yn + time->cen * 100;
time->leap = time->year % 4 == 0 && time->year % 100 != 0;
time->yday = mday_offset[time->mon] + time->mday;
if (time->leap && time->mon > 2)
time->yday++;
time->year -= 1900;
}
uint64_t unixtime(void)
{
struct time time;
gettime(&time);
// FIXME: probably wrong
uint64_t unix = 0;
unix += time.sec;
unix += time.min * 60;
unix += time.hour * 60 * 60;
unix += time.yday * 60 * 60 * 24;
unix += time.year * 60 * 60 * 24 * 365;
return unix;
}
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