Implement a time service

[marysaka]

No one asked for it but here it is: The Civil Time PR!

This PR adds a new process "time" in charge of handling the RTC and Timezones.
Also, The "clock" process was renamed to "wall-clock" and was updated to use the IPC interface accordingly.

PS: This PR needs #317

[todo]

Implement get_rtc_event

We need CreateEvent, SignalEvent and ClearEvent syscalls before being able to implement it

---

SunriseOS/time/src/main.rs

Lines 125 to 135 in ee0f1e6

	/// TODO: Implement get_rtc_event
	/// BODY: We need CreateEvent, SignalEvent and ClearEvent syscalls before being able to implement it
	pub fn get_irq_event_handle(&self) -> HandleRef<'static> {
	unimplemented!()
	}
	/// Read from a CMOS register.
	fn read_reg(&mut self, reg: u8) -> u8 {
	self.command.write(reg);
	self.data.read()
	}

---

This comment was generated by todo based on a TODO comment in ee0f1e6 in #318. cc @Thog.

[todo]

Move to FileSystem interface after implementation

SunriseOS/time/src/timezone.rs

Lines 26 to 36 in ee0f1e6

	// TODO: Move to FileSystem interface after implementation
	include!(concat!(env!("OUT_DIR"), "/timezone_data.rs"));
	/// Represent the file I/O interface with tzdata.
	struct TimeZoneFileSystem;
	/// Represent a file inside a TimeZoneFileSystem.
	struct TimeZoneFile {
	/// The content of the file.
	data: &'static [u8]
	}

---

This comment was generated by todo based on a TODO comment in ee0f1e6 in #318. cc @Thog.

[todo]

Use plain

SunriseOS/time/src/timezone.rs

Lines 250 to 260 in ee0f1e6

	// TODO: Use plain
	(tz_rules as *mut _ as *mut TimeZoneRule).as_mut().unwrap()
	};
	TZ_MANAGER.lock().load_timezone_rule(location, Some(tz_rules))
	}
	#[inline(never)]
	fn to_calendar_time(&mut self, _manager: &WaitableManager, time: PosixTime, timezone_buffer: &IpcTimeZoneRule, ) -> Result<(CalendarTime, CalendarAdditionalInfo), Error> {
	let timezones = unsafe {
	// TODO: Use plain
	(timezone_buffer as *const _ as *const TimeZoneRule).as_ref().unwrap()

---

This comment was generated by todo based on a TODO comment in ee0f1e6 in #318. cc @Thog.

[todo]

Use plain

SunriseOS/time/src/timezone.rs

Lines 259 to 269 in ee0f1e6

	// TODO: Use plain
	(timezone_buffer as *const _ as *const TimeZoneRule).as_ref().unwrap()
	};
	let res = timezones.to_calendar_time(time);
	if let Err(error) = res {
	return Err(to_timezone_to_time_error(error));
	}
	let (calendar_time, calendar_additional_data) = calendar_to_ipc(res.unwrap());
	Ok((calendar_time, calendar_additional_data, ))

---

This comment was generated by todo based on a TODO comment in ee0f1e6 in #318. cc @Thog.

[todo]

Use plain

SunriseOS/time/src/timezone.rs

Lines 290 to 300 in ee0f1e6

	// TODO: Use plain
	(timezone_buffer as *const _ as *const TimeZoneRule).as_ref().unwrap()
	};
	let res = timezones.to_posix_time(&calendar_to_tzlib(calendar_time));
	if let Err(error) = res {
	return Err(to_timezone_to_time_error(error));
	}
	Ok(res.unwrap())
	}

---

This comment was generated by todo based on a TODO comment in ee0f1e6 in #318. cc @Thog.

[todo]

Use get_rtc_event event handle

We need CreateEvent, SignalEvent and ClearEvent syscalls before using this.

---

SunriseOS/wall-clock/src/main.rs

Lines 125 to 135 in ee0f1e6

	// TODO: Use get_rtc_event event handle
	// BODY: We need CreateEvent, SignalEvent and ClearEvent syscalls before using this.
	syscalls::sleep_thread(1000000000).unwrap();
	//syscalls::wait_synchronization(&[rtc_event.as_ref()], None).unwrap();
	let timestamp = rtc.get_rtc_time().unwrap();
	let res = timezone_service.to_calendar_time_with_my_rule(timestamp).unwrap();
	let res_custom_timezone = timezone_service.to_calendar_time(timestamp, &rule.inner).unwrap();
	let _ = writeln!(&mut logger);

---

This comment was generated by todo based on a TODO comment in ee0f1e6 in #318. cc @Thog.

[roblabla]

A few tweaks

[roblabla]

Apart from the couple of nits about Safety comment format, this looks good!