新增rust ffi (#77)

* 引入cargo

* 取消对Cargo.lock的跟踪

* 解决vscode报错问题

* new: rust的代码能够调用c语言的printk_color

* 1、将原本run.sh的工作拆解，变为几个不同的make命令
2、在docker镜像中编译rust

* 更改workflow

* update workflow

* new: 解决workflow无法通过编译的问题

kernel/build.rs

@@ -0,0 +1,40 @@
+extern crate bindgen;
+
+use std::path::PathBuf;
+
+fn main() {
+    // Tell cargo to look for shared libraries in the specified directory
+    println!("cargo:rustc-link-search=src");
+    println!("cargo:rerun-if-changed=src/include/bindings/wrapper.h");
+    let binding_file_path = "src/include/bindings/bindings.rs";
+    // The bindgen::Builder is the main entry point
+    // to bindgen, and lets you build up options for
+    // the resulting bindings.
+    {
+        let bindings = bindgen::Builder::default()
+            .clang_arg("-I./src")
+            // The input header we would like to generate
+            // bindings for.
+            .header("src/include/bindings/wrapper.h")
+            .clang_arg("--target=x86_64-none-none")
+            .clang_arg("-v")
+            // 使用core，并将c语言的类型改为core::ffi，而不是使用std库。
+            .use_core()
+            .ctypes_prefix("::core::ffi")
+            .generate_inline_functions(true)
+            // Tell cargo to invalidate the built crate whenever any of the
+            // included header files changed.
+            .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+            // Finish the builder and generate the bindings.
+            .generate()
+            // Unwrap the Result and panic on failure.
+            .expect("Unable to generate bindings");
+
+        // Write the bindings to the $OUT_DIR/bindings.rs file.
+        let out_path = PathBuf::from(String::from("."));
+
+        bindings
+            .write_to_file(out_path.join(binding_file_path))
+            .expect("Couldn't write bindings!");
+    }
+}