vendor/redox_syscall/src/io/mmio.rs

   1 use core::ptr::{read_volatile, write_volatile};
   2 use core::mem::uninitialized;
   3 use core::ops::{BitAnd, BitOr, Not};
   4
   5 use super::io::Io;
   6
   7 #[repr(packed)]
   8 pub struct Mmio<T> {
   9     value: T,
  10 }
  11
  12 impl<T> Mmio<T> {
  13     /// Create a new Mmio without initializing
  14     pub fn new() -> Self {
  15         Mmio {
  16             value: unsafe { uninitialized() }
  17         }
  18     }
  19 }
  20
  21 impl<T> Io for Mmio<T> where T: Copy + PartialEq + BitAnd<Output = T> + BitOr<Output = T> + Not<Output = T> {
  22     type Value = T;
  23
  24     fn read(&self) -> T {
  25         unsafe { read_volatile(&self.value) }
  26     }
  27
  28     fn write(&mut self, value: T) {
  29         unsafe { write_volatile(&mut self.value, value) };
  30     }
  31 }