1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/src/io/serial.rs b/kernel/src/io/serial.rs
new file mode 100644
index 0000000..e1d4660
--- /dev/null
+++ b/kernel/src/io/serial.rs
@@ -0,0 +1,25 @@
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u32)]
+pub enum QemuExitCode {
+    Success = 0x10, // The actual exit code is (value << 1) | 1.
+    Failed = 0x11,
+}
+
+pub fn exit_qemu(exit_code: QemuExitCode) {
+    use x86_64::instructions::port::Port;
+
+    unsafe {
+        let mut port = Port::new(0xf4);
+        port.write(exit_code as u32);
+    }
+}
+
+fn trivial_assertion() {
+    use crate::io::vga_text::OStream;
+    let mut stdout = OStream::new();
+    stdout.clear();
+
+    stdout.print(b"trivial assertion... ");
+    assert_eq!(0, 1);
+    stdout.print(b"[ok]");
+}