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traits.rs
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traits.rs
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use as_slice::AsSlice;
use core::{
mem,
ops::{Deref, DerefMut},
};
use stable_deref_trait::StableDeref;
pub unsafe trait DmaReadBuffer: Deref {
fn dma_read_buffer(&self) -> (*const u8, usize);
}
pub unsafe trait DmaWriteBuffer: DerefMut {
fn dma_write_buffer(&mut self) -> (*mut u8, usize);
}
unsafe impl<B, W> DmaReadBuffer for B
where
B: Deref + StableDeref,
B::Target: AsSlice<Element = W>,
{
fn dma_read_buffer(&self) -> (*const u8, usize) {
let slice = self.as_slice();
let ptr = slice.as_ptr() as *const u8;
let len = slice.len() * mem::size_of::<W>();
(ptr, len)
}
}
pub unsafe trait DmaWriteTarget {}
unsafe impl DmaWriteTarget for u8 {}
unsafe impl DmaWriteTarget for u16 {}
unsafe impl DmaWriteTarget for u32 {}
unsafe impl DmaWriteTarget for [u8] {}
unsafe impl DmaWriteTarget for [u16] {}
unsafe impl DmaWriteTarget for [u32] {}
macro_rules! array_impls {
( $( $i:expr, )+ ) => {
$(
unsafe impl DmaWriteTarget for [u8; $i] {}
unsafe impl DmaWriteTarget for [u16; $i] {}
unsafe impl DmaWriteTarget for [u32; $i] {}
)+
};
}
#[rustfmt::skip]
array_impls!(
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
30, 31, 32,
);
unsafe impl<B, T> DmaWriteBuffer for B
where
B: DerefMut<Target = T> + StableDeref,
T: DmaWriteTarget + ?Sized,
{
fn dma_write_buffer(&mut self) -> (*mut u8, usize) {
let target = self.deref_mut();
let ptr = target as *mut T as *mut u8;
let len = mem::size_of_val(target);
(ptr, len)
}
}