reorganise

bootle/src/lib.rs

@@ -0,0 +1,55 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _start() -> ! {
+    welcome_serial();
+    halt()
+}
+
+fn print_serial(s: &str) {
+    let mut bytes = s.bytes();
+    while let Some(b) = bytes.next() {
+        unsafe {
+            core::arch::asm!(
+                "out dx, al"
+                , in("al") b
+            )
+        };
+    }
+}
+
+fn println_serial(s: &str) {
+    print_serial(s);
+    print_serial("\n");
+}
+
+fn welcome_serial() {
+    print_serial(ANSI_PINK);
+    println_serial("\nWelcome to Bootle OS");
+    println_serial("All code GPL licensed and freely available on git.mtgmonkey.net");
+    print_serial("Enjoy your time! Press ");
+    print_serial(ANSI_RED);
+    print_serial("ctrl+a x");
+    print_serial(ANSI_PINK);
+    println_serial(" to escape Qemu");
+    print_serial(ANSI_CLEAR);
+}
+
+#[panic_handler]
+fn panic(_: &PanicInfo) -> ! {
+    print_serial("panicked");
+    halt()
+}
+
+fn halt() -> ! {
+    unsafe { core::arch::asm!("hlt") };
+    halt()
+}
+
+const ANSI_CLEAR: &str = "\x1b[0m";
+const ANSI_RED: &str = "\x1b[31m";
+const ANSI_PINK: &str = "\x1b[35m";
+const ANSI_GREEN: &str = "\x1b[32m";