started setting up support for C code in the kernel

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/FoundryOS.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="EMPTY_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/kernel/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/lib_example/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/FoundryOS.iml" filepath="$PROJECT_DIR$/.idea/FoundryOS.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/build/limine" vcs="Git" />
+  </component>
+</project>

Cargo.lock

@@ -8,10 +8,20 @@ version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f68f53c83ab957f72c32642f3868eec03eb974d1fb82e453128456482613d36"
 
+[[package]]
+name = "cc"
+version = "1.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c3d1b2e905a3a7b00a6141adb0e4c0bb941d11caf55349d863942a1cc44e3c9"
+dependencies = [
+ "shlex",
+]
+
 [[package]]
 name = "kernel"
 version = "0.1.0"
 dependencies = [
+ "cc",
  "lib_example",
  "limine",
 ]
@@ -28,3 +38,9 @@ checksum = "9ca87cab008b8efeebdbe037cd4d1438037d48c5cb6fed939ffa5aa06315a321"
 dependencies = [
  "bitflags",
 ]
+
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"

kernel/Cargo.toml

@@ -7,9 +7,12 @@ edition = "2021"
 limine = "0.3.1"
 lib_example = { path = "../lib_example" }
 
+[build-dependencies]
+cc = "1.2.14"
+
 [features]
 default = []
 
 [[bin]]
 name = "kernel"
-path = "src/main.rs"
+path = "src/main.rs"

kernel/build.rs

@@ -1,9 +1,14 @@
 use std::process::Command;
 use std::{env, path::Path};
+use cc;
 
 fn main() {
     // Tell cargo to rerun if these files change
     println!("cargo:rerun-if-changed=src");
     println!("cargo:rerun-if-changed=linker.ld");
     println!("cargo:rerun-if-changed=../config/limine.conf");
-}
+
+    cc::Build::new()
+        .file("src/main.c")
+        .compile("lib");
+}

kernel/src/main.c

@@ -0,0 +1,3 @@
+int add(int x, int y)  {
+    return x+y;
+}

kernel/src/main.rs

@@ -28,6 +28,11 @@ static _START_MARKER: RequestsStartMarker = RequestsStartMarker::new();
 #[link_section = ".requests_end_marker"]
 static _END_MARKER: RequestsEndMarker = RequestsEndMarker::new();
 
+
+extern "C" {
+    pub fn add(x: i32, y: i32) -> i32;
+}
+
 #[no_mangle]
 unsafe extern "C" fn kmain() -> ! {
     // All limine requests must also be referenced in a called function, otherwise they may be
@@ -35,6 +40,8 @@ unsafe extern "C" fn kmain() -> ! {
     assert!(BASE_REVISION.is_supported());
 
     lib_example::add_nums(1, 2);
+    add(1, 2);
+
 
     if let Some(framebuffer_response) = FRAMEBUFFER_REQUEST.get_response() {
         if let Some(framebuffer) = framebuffer_response.framebuffers().next() {