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| -rw-r--r-- | rust/kernel/types.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs index 3b0c44769708..e84e51ec9716 100644 --- a/rust/kernel/types.rs +++ b/rust/kernel/types.rs @@ -2,6 +2,31 @@ //! Kernel types. +use core::{cell::UnsafeCell, mem::MaybeUninit}; + +/// Stores an opaque value. +/// +/// This is meant to be used with FFI objects that are never interpreted by Rust code. +#[repr(transparent)] +pub struct Opaque<T>(MaybeUninit<UnsafeCell<T>>); + +impl<T> Opaque<T> { + /// Creates a new opaque value. + pub const fn new(value: T) -> Self { + Self(MaybeUninit::new(UnsafeCell::new(value))) + } + + /// Creates an uninitialised value. + pub const fn uninit() -> Self { + Self(MaybeUninit::uninit()) + } + + /// Returns a raw pointer to the opaque data. + pub fn get(&self) -> *mut T { + UnsafeCell::raw_get(self.0.as_ptr()) + } +} + /// A sum type that always holds either a value of type `L` or `R`. pub enum Either<L, R> { /// Constructs an instance of [`Either`] containing a value of type `L`. |