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// SPDX-License-Identifier: GPL-2.0
//! Crate for all kernel procedural macros.
mod concat_idents;
mod helpers;
mod module;
use proc_macro::TokenStream;
/// Declares a kernel module.
///
/// The `type` argument should be a type which implements the [`Module`]
/// trait. Also accepts various forms of kernel metadata.
///
/// C header: [`include/linux/moduleparam.h`](../../../include/linux/moduleparam.h)
///
/// [`Module`]: ../kernel/trait.Module.html
///
/// # Examples
///
/// ```ignore
/// use kernel::prelude::*;
///
/// module!{
/// type: MyModule,
/// name: b"my_kernel_module",
/// author: b"Rust for Linux Contributors",
/// description: b"My very own kernel module!",
/// license: b"GPL",
/// params: {
/// my_i32: i32 {
/// default: 42,
/// permissions: 0o000,
/// description: b"Example of i32",
/// },
/// writeable_i32: i32 {
/// default: 42,
/// permissions: 0o644,
/// description: b"Example of i32",
/// },
/// },
/// }
///
/// struct MyModule;
///
/// impl kernel::Module for MyModule {
/// fn init() -> Result<Self> {
/// // If the parameter is writeable, then the kparam lock must be
/// // taken to read the parameter:
/// {
/// let lock = THIS_MODULE.kernel_param_lock();
/// pr_info!("i32 param is: {}\n", writeable_i32.read(&lock));
/// }
/// // If the parameter is read only, it can be read without locking
/// // the kernel parameters:
/// pr_info!("i32 param is: {}\n", my_i32.read());
/// Ok(Self)
/// }
/// }
/// ```
///
/// # Supported argument types
/// - `type`: type which implements the [`Module`] trait (required).
/// - `name`: byte array of the name of the kernel module (required).
/// - `author`: byte array of the author of the kernel module.
/// - `description`: byte array of the description of the kernel module.
/// - `license`: byte array of the license of the kernel module (required).
/// - `alias`: byte array of alias name of the kernel module.
#[proc_macro]
pub fn module(ts: TokenStream) -> TokenStream {
module::module(ts)
}
/// Concatenate two identifiers.
///
/// This is useful in macros that need to declare or reference items with names
/// starting with a fixed prefix and ending in a user specified name. The resulting
/// identifier has the span of the second argument.
///
/// # Examples
///
/// ```ignore
/// use kernel::macro::concat_idents;
///
/// macro_rules! pub_no_prefix {
/// ($prefix:ident, $($newname:ident),+) => {
/// $(pub(crate) const $newname: u32 = kernel::macros::concat_idents!($prefix, $newname);)+
/// };
/// }
///
/// pub_no_prefix!(
/// binder_driver_return_protocol_,
/// BR_OK,
/// BR_ERROR,
/// BR_TRANSACTION,
/// BR_REPLY,
/// BR_DEAD_REPLY,
/// BR_TRANSACTION_COMPLETE,
/// BR_INCREFS,
/// BR_ACQUIRE,
/// BR_RELEASE,
/// BR_DECREFS,
/// BR_NOOP,
/// BR_SPAWN_LOOPER,
/// BR_DEAD_BINDER,
/// BR_CLEAR_DEATH_NOTIFICATION_DONE,
/// BR_FAILED_REPLY
/// );
///
/// assert_eq!(BR_OK, binder_driver_return_protocol_BR_OK);
/// ```
#[proc_macro]
pub fn concat_idents(ts: TokenStream) -> TokenStream {
concat_idents::concat_idents(ts)
}
|
