95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
|
|
*
|
|
* CMOS Driver
|
|
*
|
|
* Part of the ToAruOS Kernel
|
|
* (C) 2011 Kevin Lange
|
|
*/
|
|
|
|
#include <system.h>
|
|
|
|
/* CMOS values are stored like so:
|
|
* Say it's 8:42 AM, then the values are stored as:
|
|
* 0x08, 0x42... why this was a good idea, I have no
|
|
* clue, but that's how it usually is.
|
|
*
|
|
* This function will convert between this "BCD" format
|
|
* and regular decimal integers. */
|
|
#define from_bcd(val) ((val / 16) * 10 + (val & 0xf))
|
|
|
|
void
|
|
cmos_dump(
|
|
uint16_t * values
|
|
) {
|
|
uint16_t index;
|
|
IRQ_OFF;
|
|
for (index = 0; index < 128; ++index) {
|
|
outportb(0x70, index);
|
|
values[index] = inportb(0x71);
|
|
}
|
|
IRQ_ON;
|
|
}
|
|
|
|
/**
|
|
* Get the current month and day.
|
|
*
|
|
* @param month Pointer to a short to store the month
|
|
* @param day Pointer to a short to store the day
|
|
*/
|
|
void
|
|
get_date(
|
|
uint16_t * month,
|
|
uint16_t * day
|
|
) {
|
|
uint16_t values[128]; /* CMOS dump */
|
|
cmos_dump(values);
|
|
|
|
*month = from_bcd(values[8]);
|
|
*day = from_bcd(values[7]);
|
|
}
|
|
|
|
/**
|
|
* Get the current time.
|
|
*
|
|
* @param hours Pointer to a short to store the current hour (/24)
|
|
* @param minutes Pointer to a short to store the current minute
|
|
* @param seconds Pointer to a short to store the current second
|
|
*/
|
|
void
|
|
get_time(
|
|
uint16_t * hours,
|
|
uint16_t * minutes,
|
|
uint16_t * seconds
|
|
) {
|
|
uint16_t values[128]; /* CMOS dump */
|
|
cmos_dump(values);
|
|
|
|
*hours = from_bcd(values[4]);
|
|
*minutes = from_bcd(values[2]);
|
|
*seconds = from_bcd(values[0]);
|
|
}
|
|
|
|
int
|
|
gettimeofday(struct timeval * t, void *z) {
|
|
uint16_t values[128];
|
|
cmos_dump(values);
|
|
|
|
/* Math Time */
|
|
uint32_t time = (from_bcd(values[9]) - 70) * 31556926 +
|
|
from_bcd(values[8]) * 2629743 +
|
|
from_bcd(values[7]) * 87400 +
|
|
from_bcd(values[4]) * 3600 +
|
|
from_bcd(values[2]) * 60 +
|
|
from_bcd(values[0]);
|
|
t->tv_sec = time;
|
|
t->tv_usec = 0;
|
|
return 0;
|
|
}
|
|
|
|
uint32_t now() {
|
|
struct timeval t;
|
|
gettimeofday(&t, NULL);
|
|
return t.tv_sec;
|
|
}
|
|
|