From 403c53fd6c7059c159db1604eb178251239fc4bf Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Mon, 4 Nov 2019 03:25:16 +0100
Subject: Implement serial connection and basic testing

---
 kernel/src/io/qemu.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 kernel/src/io/qemu.rs

(limited to 'kernel/src/io/qemu.rs')

diff --git a/kernel/src/io/qemu.rs b/kernel/src/io/qemu.rs
new file mode 100644
index 0000000..8b01885
--- /dev/null
+++ b/kernel/src/io/qemu.rs
@@ -0,0 +1,15 @@
+#[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);
+    }
+}
-- 
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