add rust kernel stub

src/lib.rs

@@ -0,0 +1,20 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _start() -> ! {
+    // 'k'
+    loop{unsafe {core::arch::asm!(
+        "out dx, al", in("al") 0x6Bu8
+    )}}
+}
+
+#[panic_handler]
+fn panic(_: &PanicInfo) -> ! {
+    // 'p'
+    loop{unsafe {core::arch::asm!(
+        "out dx, al", in("al") 0x70u8
+    )}}
+}

src/linker.ld

@@ -0,0 +1,8 @@
+SECTIONS
+{
+  . = 0x00010000;
+  .text : {
+    *(.text._start)
+    *(.text*)
+  }
+}