Simple hello world

src/main.rs

@@ -0,0 +1,32 @@
+#![no_std]
+#![no_main]
+
+use crate::uart::Uart0;
+use core::sync::atomic::{self, Ordering};
+use core::{arch::global_asm, fmt::Write, panic::PanicInfo};
+
+mod uart;
+
+global_asm!(include_str!("start.s"));
+
+#[no_mangle]
+pub extern "C" fn entry() -> ! {
+    let mut uart = Uart0 {};
+
+    for i in 0..3 {
+        writeln!(&mut uart, "Hello from Rust {i}!").unwrap();
+    }
+
+    loop {
+        atomic::compiler_fence(Ordering::SeqCst);
+    }
+}
+
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    writeln!(Uart0, "{info}").unwrap();
+
+    loop {
+        atomic::compiler_fence(Ordering::SeqCst);
+    }
+}