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use core::ptr::{read_volatile, write_volatile, addr_of, addr_of_mut};
use core::mem::MaybeUninit;
use core::ops::{BitAnd, BitOr, Not};
use super::io::Io;
#[repr(packed)]
pub struct Mmio<T> {
value: MaybeUninit<T>,
}
impl<T> Mmio<T> {
/// Create a new Mmio without initializing
#[deprecated = "unsound because it's possible to read even though it's uninitialized"]
pub fn new() -> Self {
unsafe { Self::uninit() }
}
pub unsafe fn zeroed() -> Self {
Self {
value: MaybeUninit::zeroed(),
}
}
pub unsafe fn uninit() -> Self {
Self {
value: MaybeUninit::uninit(),
}
}
pub const fn from(value: T) -> Self {
Self {
value: MaybeUninit::new(value),
}
}
}
impl<T> Io for Mmio<T> where T: Copy + PartialEq + BitAnd<Output = T> + BitOr<Output = T> + Not<Output = T> {
type Value = T;
fn read(&self) -> T {
unsafe { read_volatile(addr_of!(self.value).cast::<T>()) }
}
fn write(&mut self, value: T) {
unsafe { write_volatile(addr_of_mut!(self.value).cast::<T>(), value) };
}
}
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