Module rtc 

CMOS Real-Time Clock (RTC) reader for x86_64.

Reads date/time from the MC146818-compatible CMOS RTC via I/O ports 0x70 (index) and 0x71 (data). Converts BCD-encoded values to binary and provides a Unix-epoch-relative timestamp for the panel clock.

Structs

RtcAlarm

Alarm time for ioctl RTC_ALM_SET.

RtcTime

RTC time snapshot.

Constants

RTC_AIE_OFF

Ioctl command: disable alarm interrupt.

RTC_AIE_ON

Ioctl command: enable alarm interrupt.

RTC_ALM_SET

Ioctl command: set alarm time.

Functions

current_epoch_secs

Get current wall-clock seconds since Unix epoch.

disable_alarm

Disable the CMOS alarm interrupt.

get_time_correction

Get the current NTP correction in milliseconds.

get_timezone_offset

Get the current timezone offset in seconds.

init

Read the CMOS RTC and initialize the boot epoch.

read_rtc

Read the RTC registers, handling BCD conversion and update-in-progress.

rtc_interrupt_handler

RTC interrupt handler (IRQ 8, vector 40 on PIC / remapped on APIC).

rtc_ioctl

Perform an RTC ioctl operation.

rtc_read

Read the current RTC time (/dev/rtc read interface).

set_alarm

Set the CMOS alarm to fire at the given hour:minute:second.

set_alarm_callback

Register a callback function pointer to invoke when the alarm fires.

set_time_correction

Apply a time correction from an NTP client.

set_timezone_offset

Set the timezone offset from UTC in seconds.