如何使用 rust 写内核模块

#![no_std]// no_std用于表示没有std库，即freestanding环境extern crate alloc;
use alloc::borrow::ToOwned;use alloc::string::String;
// 我们以printk为底层，提供了printlnuse linux_kernel_module::println;
// 这个struct代表内核模块struct HelloWorldModule {    message: String,}
// 实现内核模块初始化方法impl linux_kernel_module::KernelModule for HelloWorldModule {    fn init() -> linux_kernel_module::KernelResult<Self> {        println!("Hello kernel module from rust!");        Ok(HelloWorldModule {            message: "on the heap!".to_owned(),        })    }}
// 提供内核模块卸载方法impl Drop for HelloWorldModule {    fn drop(&mut self) {        println!("My message is {}", self.message);        println!("Goodbye kernel module from rust!");    }}
// 通过kernel_module宏，export了内核模块的相关信息linux_kernel_module::kernel_module!(    HelloWorldModule,    author: b"Fish in a Barrel Contributors",    description: b"An extremely simple kernel module",    license: b"GPL");

$ cd linux-kernel-module-rust/hello-world$ RUST_TARGET_PATH=$(pwd)/.. cargo +nightly xbuild --target x86_64-linux-kernel-module$ make$ insmod helloworld.ko$ rmmod helloworld$ dmesg | tail -n 3[521088.916091] Hello kernel module from rust![521174.204889] My message is on the heap![521174.204891] Goodbye kernel module from rust!

{    "rust-analyzer.cargo.extraEnv": {        "RUST_TARGET_PATH": "/root/linux-kernel-module-rust"    },    "rust-analyzer.cargo.target": "x86_64-linux-kernel-module",    "rust-analyzer.server.extraEnv": {        "RA_LOG": "lsp_server=debug",        "RUST_TARGET_PATH": "/root/linux-kernel-module-rust"    },    "rust-analyzer.trace.server": "verbose",    "rust-analyzer.linkedProjects": [        "hello-world/Cargo.toml",        "Cargo.toml"    ],}