blob: 2da61da7fadcfaea31f1865ee24cde6aeb58966a (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
// MIT License, Copyright (c) 2021 Marvin Borner
#include <cpu.h>
#include <def.h>
#include <fs.h>
#include <mem.h>
#include <rtc.h>
#include <str.h>
#include <timer.h>
static u8 rtc_busy(void)
{
outb(0x70, 0x0A);
return (inb(0x71) & 0x80) == 0x80;
}
static u8 rtc_register(u8 reg)
{
outb(0x70, reg);
return inb(0x71);
}
static void rtc_fill(struct rtc *rtc)
{
while (rtc_busy())
;
rtc->second = rtc_register(0x00);
rtc->minute = rtc_register(0x02);
rtc->hour = rtc_register(0x04);
rtc->day = rtc_register(0x07);
rtc->month = rtc_register(0x08);
rtc->year = rtc_register(0x09);
//obj.century = 20; //rtc_register(0x00);
}
struct rtc rtc_read(void)
{
struct rtc rtc = { 0 };
rtc_fill(&rtc);
struct rtc last = { 0 };
do {
rtc_fill(&last);
} while (memcmp(&rtc, &last, sizeof(rtc)) != 0);
u32 reg_b = rtc_register(0x0B);
if (!(reg_b & 0x04)) {
rtc.second = (u8)((rtc.second & 0x0F) + ((rtc.second / 16) * 10));
rtc.minute = (u8)((rtc.minute & 0x0F) + ((rtc.minute / 16) * 10));
rtc.hour = (u8)(((rtc.hour & 0x0F) + (((rtc.hour & 0x70) / 16) * 10)) |
(rtc.hour & 0x80));
rtc.day = (u8)((rtc.day & 0x0F) + ((rtc.day / 16) * 10));
rtc.month = (u8)((rtc.month & 0x0F) + ((rtc.month / 16) * 10));
rtc.year = (rtc.year & 0x0F) + ((rtc.year / 16) * 10);
/* rtc.century = (century & 0x0F) + ((century / 16) * 10); */
}
if (!(reg_b & 0x02) && (rtc.hour & 0x80))
rtc.hour = (u8)(((rtc.hour & 0x7F) + 12) % 24);
return rtc;
}
u32 rtc_stamp(void)
{
struct rtc rtc = rtc_read();
return rtc.second + rtc.minute * 60 + rtc.hour * 360 + rtc.day * 360 * 24 +
rtc.year * 360 * 24 * 365;
}
|
