Kernel now works on rust

rust/kernel/.cargo/config.toml

@@ -8,3 +8,6 @@ target = "target.json"
 
 [target.'cfg(target_os = "none")']
 runner = "bootimage runner"
+
+[target.'cfg(target_os = "linux")']
+rustflags = ["-C", "link-arg=-nostartfiles"]

rust/kernel/src/main.rs

@@ -4,7 +4,7 @@
 static HELLO: &[u8] = b"Hello World!";
 
 #[unsafe(no_mangle)]
-fn _start() -> ! {
+pub extern "C" fn _start() -> ! {
     let vga_buffer = 0xb8000 as *mut u8;
     for (i, &byte) in HELLO.iter().enumerate() {
         unsafe {
@@ -12,9 +12,9 @@ fn _start() -> ! {
             *vga_buffer.offset(i as isize * 2 + 1) = 0xb;
         }
     }
+
     loop {}
 }
-
 #[panic_handler]
 fn panic(_info: &core::panic::PanicInfo) -> ! {
     loop {}

rust/kernel/target.json

@@ -19,10 +19,5 @@
   "has-rpath": false,
   "no-default-libraries": true,
   "position-independent-executables": false,
-  "pre-link-args": {
-    "ld.lld": [
-      "--script=./linker.ld"
-    ]
-  },
   "rustc-abi": "x86-softfloat"
 }