ba20915bae
Introduce the new `types` module of the `kernel` crate with
`Either` as its first type.
`Either<L, R>` is a sum type that always holds either a value
of type `L` (`Left` variant) or `R` (`Right` variant).
For instance:
struct Executor {
queue: Either<BoxedQueue, &'static Queue>,
}
Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
88 lines
2.5 KiB
Rust
88 lines
2.5 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
//! The `kernel` crate.
|
|
//!
|
|
//! This crate contains the kernel APIs that have been ported or wrapped for
|
|
//! usage by Rust code in the kernel and is shared by all of them.
|
|
//!
|
|
//! In other words, all the rest of the Rust code in the kernel (e.g. kernel
|
|
//! modules written in Rust) depends on [`core`], [`alloc`] and this crate.
|
|
//!
|
|
//! If you need a kernel C API that is not ported or wrapped yet here, then
|
|
//! do so first instead of bypassing this crate.
|
|
|
|
#![no_std]
|
|
#![feature(allocator_api)]
|
|
#![feature(core_ffi_c)]
|
|
|
|
// Ensure conditional compilation based on the kernel configuration works;
|
|
// otherwise we may silently break things like initcall handling.
|
|
#[cfg(not(CONFIG_RUST))]
|
|
compile_error!("Missing kernel configuration for conditional compilation");
|
|
|
|
#[cfg(not(test))]
|
|
#[cfg(not(testlib))]
|
|
mod allocator;
|
|
mod build_assert;
|
|
pub mod error;
|
|
pub mod prelude;
|
|
pub mod print;
|
|
mod static_assert;
|
|
#[doc(hidden)]
|
|
pub mod std_vendor;
|
|
pub mod str;
|
|
pub mod types;
|
|
|
|
#[doc(hidden)]
|
|
pub use bindings;
|
|
pub use macros;
|
|
|
|
#[doc(hidden)]
|
|
pub use build_error::build_error;
|
|
|
|
/// Prefix to appear before log messages printed from within the `kernel` crate.
|
|
const __LOG_PREFIX: &[u8] = b"rust_kernel\0";
|
|
|
|
/// The top level entrypoint to implementing a kernel module.
|
|
///
|
|
/// For any teardown or cleanup operations, your type may implement [`Drop`].
|
|
pub trait Module: Sized + Sync {
|
|
/// Called at module initialization time.
|
|
///
|
|
/// Use this method to perform whatever setup or registration your module
|
|
/// should do.
|
|
///
|
|
/// Equivalent to the `module_init` macro in the C API.
|
|
fn init(module: &'static ThisModule) -> error::Result<Self>;
|
|
}
|
|
|
|
/// Equivalent to `THIS_MODULE` in the C API.
|
|
///
|
|
/// C header: `include/linux/export.h`
|
|
pub struct ThisModule(*mut bindings::module);
|
|
|
|
// SAFETY: `THIS_MODULE` may be used from all threads within a module.
|
|
unsafe impl Sync for ThisModule {}
|
|
|
|
impl ThisModule {
|
|
/// Creates a [`ThisModule`] given the `THIS_MODULE` pointer.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// The pointer must be equal to the right `THIS_MODULE`.
|
|
pub const unsafe fn from_ptr(ptr: *mut bindings::module) -> ThisModule {
|
|
ThisModule(ptr)
|
|
}
|
|
}
|
|
|
|
#[cfg(not(any(testlib, test)))]
|
|
#[panic_handler]
|
|
fn panic(info: &core::panic::PanicInfo<'_>) -> ! {
|
|
pr_emerg!("{}\n", info);
|
|
// SAFETY: FFI call.
|
|
unsafe { bindings::BUG() };
|
|
// Bindgen currently does not recognize `__noreturn` so `BUG` returns `()`
|
|
// instead of `!`. See <https://github.com/rust-lang/rust-bindgen/issues/2094>.
|
|
loop {}
|
|
}
|