time/
manager.rs

1use crate::{Error, Result};
2use core::time::Duration;
3use file_system::DirectCharacterDevice;
4pub struct Manager<'a> {
5    device: &'a (dyn DirectCharacterDevice + Send + Sync),
6    start_time: Duration,
7}
8
9impl<'a> Manager<'a> {
10    pub fn new(device: &'a (dyn DirectCharacterDevice + Send + Sync)) -> Result<Self> {
11        let start_time = Self::get_current_time_from_device(device)?;
12
13        Ok(Self { device, start_time })
14    }
15
16    pub fn get_current_time_since_startup(&self) -> Result<Duration> {
17        let current_time = self.get_current_time()?;
18
19        Ok(current_time.abs_diff(self.start_time))
20    }
21
22    pub fn get_current_time(&self) -> Result<Duration> {
23        Self::get_current_time_from_device(self.device)
24    }
25
26    fn get_current_time_from_device(device: &dyn DirectCharacterDevice) -> Result<Duration> {
27        let mut current_time = Duration::default();
28
29        let current_time_raw = unsafe {
30            core::slice::from_raw_parts_mut(
31                &mut current_time as *mut Duration as *mut u8,
32                core::mem::size_of::<Duration>(),
33            )
34        };
35
36        device
37            .read(current_time_raw, 0)
38            .map_err(Error::DeviceError)?;
39
40        Ok(current_time)
41    }
42}
43
44pub fn initialize(
45    driver: &'static (dyn DirectCharacterDevice + Send + Sync),
46) -> Result<Manager<'static>> {
47    Manager::new(driver)
48}
time/manager.rs

time/
manager.rs
