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65 lines
1.8 KiB
Rust
65 lines
1.8 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2020-2022 Andre Richter <andre.o.richter@gmail.com>
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//! Common device driver code.
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use core::{fmt, marker::PhantomData, ops};
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//--------------------------------------------------------------------------------------------------
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// Public Definitions
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//--------------------------------------------------------------------------------------------------
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pub struct MMIODerefWrapper<T> {
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start_addr: usize,
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phantom: PhantomData<fn() -> T>,
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}
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/// A wrapper type for usize with integrated range bound check.
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#[derive(Copy, Clone)]
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pub struct BoundedUsize<const MAX_INCLUSIVE: usize>(usize);
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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impl<T> MMIODerefWrapper<T> {
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/// Create an instance.
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pub const unsafe fn new(start_addr: usize) -> Self {
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Self {
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start_addr,
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phantom: PhantomData,
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}
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}
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}
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impl<T> ops::Deref for MMIODerefWrapper<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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unsafe { &*(self.start_addr as *const _) }
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}
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}
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impl<const MAX_INCLUSIVE: usize> BoundedUsize<{ MAX_INCLUSIVE }> {
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pub const MAX_INCLUSIVE: usize = MAX_INCLUSIVE;
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/// Creates a new instance if number <= MAX_INCLUSIVE.
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pub const fn new(number: usize) -> Self {
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assert!(number <= MAX_INCLUSIVE);
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Self(number)
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}
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/// Return the wrapped number.
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pub const fn get(self) -> usize {
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self.0
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}
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}
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impl<const MAX_INCLUSIVE: usize> fmt::Display for BoundedUsize<{ MAX_INCLUSIVE }> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.0)
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}
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}
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