Nucleus

diff --git a/kernel/panic.c b/kernel/panic.c
new file mode 100644
index 0000000..a489a0a
--- /dev/null
+++ b/kernel/panic.c
@@ -0,0 +1,37 @@
+/*
+ * This file implements the kernel panic routine.  It prints the error message
+ * to the debug port then halts the system.  Since nothing runs after this, it
+ * is essentially a shutdown routine.  In an idea kernel, this wouldn't need to
+ * be compiled in.
+ */
+
+#include <nucleus/kernel.h>
+#include <io.h>
+
+/* Kernel panic */
+_Noreturn void
+panic(char *fmt, ...)
+{
+	outb(0xE9, '\033');
+	outb(0xE9, '[');
+	outb(0xE9, '3');
+	outb(0xE9, '1');
+	outb(0xE9, 'm');
+
+	char buf[1024], *p = buf;
+
+	/* Print error to serial port */
+	va_list args;
+	va_start(args, fmt);
+	vsprintf(buf, fmt, args);
+	va_end(args);
+	while (*p)
+		outb(0xE9, *p++);
+	outb(0xE9, '\n');
+
+	/* Halt processor */
+	asm volatile("cli");
+	while (1)
+		asm volatile("hlt");
+	__builtin_unreachable();
+}