mirror of
https://github.com/kenshineto/kern.git
synced 2025-04-16 23:47:25 +00:00
real time clock
This commit is contained in:
parent
3c2a519ee9
commit
3a44b8da25
GPG key ID:
9FBC6FFD6D2DBF17
7 changed files with 393 additions and 0 deletions
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@ -30,6 +30,7 @@ const kernel_src = &[_][]const u8{
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"kernel/cpu/idt.c",
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"kernel/cpu/idt.S",
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"kernel/cpu/pic.c",
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"kernel/drivers/clock.c",
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"kernel/drivers/drivers.c",
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"kernel/drivers/pci.c",
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"kernel/drivers/tty.c",
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@ -71,6 +72,7 @@ const lib_src = &[_][]const u8{
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"lib/strncpy.c",
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"lib/strtoux.c",
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"lib/strtox.c",
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"lib/timetostr.c",
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"lib/uxtoa.c",
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"lib/xtoa.c",
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};
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63
include/time.h
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63
include/time.h
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@ -0,0 +1,63 @@
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/**
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* @file time.h
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*
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* @author Freya Murphy <freya@freyacat.org>
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*
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* System time structure
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*/
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#ifndef TIME_H_
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#define TIME_H_
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#include <stddef.h>
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typedef struct {
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int sec; /// Seconds [0,59]
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int min; /// Minutes [0,59]
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int hour; /// Hour [0,23]
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int mday; /// Day of month [1,31]
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int mon; /// Month of year [0,11]
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int year; /// Years since 1900
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int wday; /// Day of week [0,6] (Sunday = 0)
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int yday; /// Day of year [0,365]
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int yn; /// Year number [0,99]
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int cen; /// Century [19,20]
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int leap; /// If year is a leap year (True == 1)
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} time_t;
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typedef enum {
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TZ_UTC = 0,
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TZ_EST = -5,
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TZ_EDT = -4,
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} timezone_t;
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/**
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* Sets the current timezone
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*/
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extern void set_timezone(timezone_t tz);
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/**
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* Returns current time in UTC
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*/
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extern time_t get_utctime(void);
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/**
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* Returns current time from current Timezone
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*/
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extern time_t get_localtime(void);
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/**
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* Return the time on the system clock
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*/
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extern size_t get_systemtime(void);
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/**
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* Converts the time into a string format
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*
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* @param time - the current time
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* @param format - see manpage for date
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* @param buf - the buffer to store it in
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*/
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extern void timetostr(time_t *time, char *format, char *buf, size_t n);
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#endif /* time.h */
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159
kernel/drivers/clock.c
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159
kernel/drivers/clock.c
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@ -0,0 +1,159 @@
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#include <lib.h>
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#include <time.h>
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#include <comus/asm.h>
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#include <comus/drivers/clock.h>
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#define CMOS_WRITE_PORT 0x70
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#define CMOS_READ_PORT 0x71
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#define CMOS_REG_SEC 0x00
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#define CMOS_REG_MIN 0x02
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#define CMOS_REG_HOUR 0x04
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#define CMOS_REG_WDAY 0x06
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#define CMOS_REG_MDAY 0x07
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#define CMOS_REG_MON 0x08
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#define CMOS_REG_YEAR 0x09
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#define CMOS_REG_CEN 0x32
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// Live buffers to work on data
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static time_t time;
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static time_t localtime;
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// Front buffers so interupts dont request data that is half done
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static time_t curr_time;
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static time_t curr_localtime;
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// Current set time Zone
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static timezone_t curr_timezone = TZ_UTC;
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static timezone_t last_timezone = TZ_UTC;
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static uint8_t cmos_read(uint8_t reg) {
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uint8_t hex, ret;
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outb(CMOS_WRITE_PORT, reg);
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hex = inb(CMOS_READ_PORT);
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ret = hex & 0x0F;
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ret += (hex & 0xF0) / 16 * 10;
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return ret;
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}
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static int mday_offset[12] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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static int month_days[12] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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static void update_localtime(void) {
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int change, max;
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// set localtime
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localtime = time;
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// if tz is UTC, we dont need to do anythin
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if (last_timezone == TZ_UTC) return;
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localtime.hour += last_timezone;
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// check if day rolled over
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change = localtime.hour < 0 ? -1 : localtime.hour >= 24 ? 1 : 0;
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if (!change) return;
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// roll over day
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localtime.hour = (localtime.hour + 24) % 24;
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localtime.wday = (localtime.wday + change + 7) % 7;
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localtime.mday += change;
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localtime.yday += change;
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// check if month rolled over
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max = month_days[localtime.mon];
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if (localtime.leap && localtime.mon == 1) max++;
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change = localtime.mday < 0 ? -1 : localtime.mday >= max ? 1 : 0;
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if (!change) return;
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// roll over month
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localtime.mon = (localtime.mon + change + 12) % 12;
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// check if year rolled over
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max = localtime.leap ? 366 : 365;
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change = localtime.yday < 0 ? -1 : localtime.yday >= max ? 1 : 0;
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if (!change) return;
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// roll over year
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localtime.yn += change;
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// check if cen rolled over
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change = localtime.yn < 0 ? -1 : localtime.yn >= 100 ? 1 : 0;
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if (!change) goto year;
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// roll over cen
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localtime.cen += change;
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year:
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localtime.year = localtime.yn + localtime.cen * 100;
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localtime.leap = localtime.year % 4 == 0 && localtime.year % 100 != 0;
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if (localtime.leap && localtime.yday == -1)
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localtime.yday = 365;
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else if (localtime.yday == -1)
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localtime.yday = 364;
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else
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localtime.yday = 0;
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localtime.year -= 1900;
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}
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void clock_update(void) {
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time.sec = cmos_read(CMOS_REG_SEC);
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time.min = cmos_read(CMOS_REG_MIN);
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time.hour = cmos_read(CMOS_REG_HOUR);
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time.wday = cmos_read(CMOS_REG_WDAY) - 1;
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time.mday = cmos_read(CMOS_REG_MDAY);
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time.mon = cmos_read(CMOS_REG_MON) - 1;
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time.yn = cmos_read(CMOS_REG_YEAR);
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time.cen = 20;
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time.year = time.yn + time.cen * 100;
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time.leap = time.year % 4 == 0 && time.year % 100 != 0;
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time.yday = mday_offset[time.mon] + time.mday;
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if (time.leap && time.mon > 2)
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time.yday++;
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time.year -= 1900;
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update_localtime();
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curr_time = time;
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curr_localtime = localtime;
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}
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void set_timezone(timezone_t tz) {
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curr_timezone = tz;
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}
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time_t get_utctime(void) {
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return curr_time;
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}
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time_t get_localtime(void) {
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if (curr_timezone != last_timezone) {
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last_timezone = curr_timezone;
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update_localtime();
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curr_localtime = localtime;
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}
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return curr_localtime;
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}
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size_t get_systemtime(void) {
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return 0;
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}
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@ -2,10 +2,12 @@
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#include <comus/drivers/uart.h>
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#include <comus/drivers/tty.h>
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#include <comus/drivers/pci.h>
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#include <comus/drivers/clock.h>
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void drivers_init(void)
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{
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uart_init();
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tty_init();
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pci_init();
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clock_update();
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}
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14
kernel/include/comus/drivers/clock.h
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14
kernel/include/comus/drivers/clock.h
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@ -0,0 +1,14 @@
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/**
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* @file clock.h
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*
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* @author Freya Murphy <freya@freyacat.org>
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*
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* CMOS real time clock driver
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*/
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#ifndef CLOCK_H_
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#define CLOCK_H_
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extern void clock_update(void);
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#endif /* clock.h */
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@ -3,6 +3,8 @@
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#include <comus/mboot.h>
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#include <comus/drivers.h>
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#include <lib.h>
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#include <stdio.h>
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#include <time.h>
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struct memory_map mmap;
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@ -23,6 +25,13 @@ void main(long magic, volatile void *mboot)
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// initalize devices
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drivers_init();
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// print current time
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char date[40];
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set_timezone(TZ_EDT);
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time_t time = get_localtime();
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timetostr(&time, "%a %b %d %Y %H:%M:%S", date, 40);
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printf("The date is: %s\n\n", date);
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// halt
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printf("halting...\n");
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}
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144
lib/timetostr.c
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144
lib/timetostr.c
Normal file
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@ -0,0 +1,144 @@
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#include <lib.h>
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#include <time.h>
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static char* ABB_WEEKDAY[7] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static char* FULL_WEEKDAY[7] = {
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"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturady"
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};
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static char* ABB_MONTH[12] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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static char* FULL_MONTH[12] = {
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"January", "Feburary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
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};
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static char *write_num(unsigned int num, unsigned int pad, char *buf, size_t n) {
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size_t digits = 1;
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unsigned int x = num;
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while (x /= 10, x > 0) digits++;
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if (pad == 0) pad = digits;
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for (size_t i = 0; i < pad; i++) {
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size_t digit;
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if (i >= digits) {
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digit = 0;
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} else {
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digit = num % 10;
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num /= 10;
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}
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if (pad - i - 1 >= n) continue;
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buf[pad - i - 1] = '0' + digit;
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}
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if (pad > n) pad = n;
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return buf + pad;
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}
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void timetostr(time_t *time, char *format, char *buf, size_t n) {
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char *index = buf;
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char c;
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int space;
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while (
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c = *format++,
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space = (buf + n) - index,
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c != '\0' && space > 0
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) {
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if (c != '%') {
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*index++ = c;
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continue;
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} else {
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c = *format++;
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}
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switch (c) {
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case '%':
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*index++ = '%';
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break;
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case 'a':
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index = strncpy(index, ABB_WEEKDAY[time->wday], space);
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break;
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case 'A':
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index = strncpy(index, FULL_WEEKDAY[time->wday], space);
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break;
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case 'b':
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case 'h':
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index = strncpy(index, ABB_MONTH[time->mon], space);
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break;
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case 'B':
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index = strncpy(index, FULL_MONTH[time->mon], space);
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break;
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case 'C':
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index = write_num(time->cen, 0, index, space);
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break;
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case 'd':
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index = write_num(time->mday, 2, index, space);
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break;
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case 'H':
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index = write_num(time->hour, 2, index, space);
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break;
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case 'I':
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index = write_num((time->hour + 12) % 12 + 1, 2, index, space);
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break;
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case 'j':
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index = write_num(time->yday, 3, index, space);
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break;
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case 'm':
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index = write_num(time->mon + 1, 2, index, space);
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break;
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case 'M':
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index = write_num(time->min, 2, index, space);
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break;
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case 'n':
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*index++ = '\n';
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break;
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case 'p':
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index = strncpy(index, time->hour > 11 ? "PM" : "AM", space);
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break;
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case 'P':
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index = strncpy(index, time->hour > 11 ? "pm" : "am", space);
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break;
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case 'q':
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index = write_num((time->mon + 3) / 3, 0, index, space);
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break;
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case 'S':
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index = write_num(time->sec, 2, index, space);
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break;
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case 't':
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*index++ = '\t';
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break;
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case 'u':
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index = write_num(((time->wday + 1 )% 7) + 1, 0, index, space);
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break;
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case 'w':
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index = write_num(time->wday, 0, index, space);
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break;
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case 'y':
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index = write_num(time->yn, 2, index, space);
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break;
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case 'Y':
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index = write_num(time->year + 1900, 0, index, space);
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break;
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default: {
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char b[3] = {'%', c, '\0'};
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index = strncpy(index, b, space);
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break;
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}
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}
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}
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if (space < 1)
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buf[n - 1] = '\0';
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else
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*index = '\0';
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}
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