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-rw-r--r--kernel/drivers/clock.c203
1 files changed, 105 insertions, 98 deletions
diff --git a/kernel/drivers/clock.c b/kernel/drivers/clock.c
index 80a44df..dd229dc 100644
--- a/kernel/drivers/clock.c
+++ b/kernel/drivers/clock.c
@@ -4,16 +4,16 @@
#include <comus/drivers/clock.h>
#define CMOS_WRITE_PORT 0x70
-#define CMOS_READ_PORT 0x71
+#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
+#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
// Live buffers to work on data
static time_t time;
@@ -27,133 +27,140 @@ static time_t curr_localtime;
static timezone_t curr_timezone = TZ_UTC;
static timezone_t last_timezone = TZ_UTC;
-static uint8_t cmos_read(uint8_t reg) {
- uint8_t hex, ret;
+static uint8_t cmos_read(uint8_t reg)
+{
+ uint8_t hex, ret;
- outb(CMOS_WRITE_PORT, reg);
- hex = inb(CMOS_READ_PORT);
+ outb(CMOS_WRITE_PORT, reg);
+ hex = inb(CMOS_READ_PORT);
- ret = hex & 0x0F;
- ret += (hex & 0xF0) / 16 * 10;
+ ret = hex & 0x0F;
+ ret += (hex & 0xF0) / 16 * 10;
- return ret;
+ return ret;
}
-static int mday_offset[12] = {
- 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
-};
+static int mday_offset[12] = { 0, 31, 59, 90, 120, 151,
+ 181, 212, 243, 273, 304, 334 };
-static int month_days[12] = {
- 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
+static int month_days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
-static void update_localtime(void) {
+static void update_localtime(void)
+{
+ int change, max;
- int change, max;
+ // set localtime
+ localtime = time;
- // set localtime
- localtime = time;
+ // if tz is UTC, we dont need to do anythin
+ if (last_timezone == TZ_UTC)
+ return;
- // if tz is UTC, we dont need to do anythin
- if (last_timezone == TZ_UTC) return;
+ localtime.hour += last_timezone;
- localtime.hour += last_timezone;
+ // check if day rolled over
+ change = localtime.hour < 0 ? -1 : localtime.hour >= 24 ? 1 : 0;
+ if (!change)
+ return;
- // check if day rolled over
- change = localtime.hour < 0 ? -1 : localtime.hour >= 24 ? 1 : 0;
- if (!change) return;
+ // roll over day
+ localtime.hour = (localtime.hour + 24) % 24;
+ localtime.wday = (localtime.wday + change + 7) % 7;
+ localtime.mday += change;
+ localtime.yday += change;
- // roll over day
- localtime.hour = (localtime.hour + 24) % 24;
- localtime.wday = (localtime.wday + change + 7) % 7;
- localtime.mday += change;
- localtime.yday += change;
+ // check if month rolled over
+ max = month_days[localtime.mon];
+ if (localtime.leap && localtime.mon == 1)
+ max++;
+ change = localtime.mday < 0 ? -1 : localtime.mday >= max ? 1 : 0;
+ if (!change)
+ return;
- // check if month rolled over
- max = month_days[localtime.mon];
- if (localtime.leap && localtime.mon == 1) max++;
- change = localtime.mday < 0 ? -1 : localtime.mday >= max ? 1 : 0;
- if (!change) return;
+ // roll over month
+ localtime.mon = (localtime.mon + change + 12) % 12;
- // roll over month
- localtime.mon = (localtime.mon + change + 12) % 12;
+ // check if year rolled over
+ max = localtime.leap ? 366 : 365;
+ change = localtime.yday < 0 ? -1 : localtime.yday >= max ? 1 : 0;
+ if (!change)
+ return;
- // check if year rolled over
- max = localtime.leap ? 366 : 365;
- change = localtime.yday < 0 ? -1 : localtime.yday >= max ? 1 : 0;
- if (!change) return;
+ // roll over year
+ localtime.yn += change;
- // roll over year
- localtime.yn += change;
-
- // check if cen rolled over
- change = localtime.yn < 0 ? -1 : localtime.yn >= 100 ? 1 : 0;
- if (!change) goto year;
-
- // roll over cen
- localtime.cen += change;
+ // check if cen rolled over
+ change = localtime.yn < 0 ? -1 : localtime.yn >= 100 ? 1 : 0;
+ if (!change)
+ goto year;
+ // roll over cen
+ localtime.cen += change;
year:
- localtime.year = localtime.yn + localtime.cen * 100;
- localtime.leap = localtime.year % 4 == 0 && localtime.year % 100 != 0;
-
- if (localtime.leap && localtime.yday == -1)
- localtime.yday = 365;
- else if (localtime.yday == -1)
- localtime.yday = 364;
- else
- localtime.yday = 0;
+ localtime.year = localtime.yn + localtime.cen * 100;
+ localtime.leap = localtime.year % 4 == 0 && localtime.year % 100 != 0;
- localtime.year -= 1900;
+ if (localtime.leap && localtime.yday == -1)
+ localtime.yday = 365;
+ else if (localtime.yday == -1)
+ localtime.yday = 364;
+ else
+ localtime.yday = 0;
+ localtime.year -= 1900;
}
-void clock_update(void) {
- 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;
+void clock_update(void)
+{
+ 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.year = time.yn + time.cen * 100;
- time.leap = time.year % 4 == 0 && time.year % 100 != 0;
+ time.leap = time.year % 4 == 0 && time.year % 100 != 0;
- time.yday = mday_offset[time.mon] + time.mday;
+ time.yday = mday_offset[time.mon] + time.mday;
- if (time.leap && time.mon > 2)
- time.yday++;
+ if (time.leap && time.mon > 2)
+ time.yday++;
- time.year -= 1900;
+ time.year -= 1900;
- update_localtime();
+ update_localtime();
- curr_time = time;
- curr_localtime = localtime;
+ curr_time = time;
+ curr_localtime = localtime;
}
-void set_timezone(timezone_t tz) {
- curr_timezone = tz;
+void set_timezone(timezone_t tz)
+{
+ curr_timezone = tz;
}
-time_t get_utctime(void) {
- return curr_time;
+time_t get_utctime(void)
+{
+ return curr_time;
}
-time_t get_localtime(void) {
- if (curr_timezone != last_timezone) {
- last_timezone = curr_timezone;
- update_localtime();
- curr_localtime = localtime;
- }
- return curr_localtime;
+time_t get_localtime(void)
+{
+ if (curr_timezone != last_timezone) {
+ last_timezone = curr_timezone;
+ update_localtime();
+ curr_localtime = localtime;
+ }
+ return curr_localtime;
}
-size_t get_systemtime(void) {
- return 0;
+size_t get_systemtime(void)
+{
+ return 0;
}
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