it now boots and prints hello world

src/main.rs

@@ -3,11 +3,22 @@
 
 use core::panic::PanicInfo;
 
+static HELLO: &[u8] = b"Hello toto :3";
+
 // this function is the entry point since the linker
 // looks for a function named `_start` by default
 #[unsafe(no_mangle)]
 pub extern "C" fn _start() -> ! {
-    loop{}
+    let vga_buffer = 0xb8000 as *mut u8;
+
+    for (i, &byte) in HELLO.iter().enumerate() {
+        unsafe {
+            *vga_buffer.offset(i as isize * 2) = byte;
+            *vga_buffer.offset(i as isize * 2 + 1) = 0xb;
+        }
+    }
+
+    loop {}
 }
 
 // called on panic