Import the "gerbert" kernel I worked on earlier this year.

It's a lot crappier than I remembered it. It's gonna need a lot of work.

Kernel/_start.cpp

@@ -0,0 +1,15 @@
+/*
+ * _start()
+ *
+ * This is where we land immediately after leaving the bootloader.
+ *
+ * ATM it's really shaky so don't put code before it ^_^
+ */
+
+extern void init();
+
+extern "C" void _start()
+{
+    init();
+    asm volatile("cli; hlt");
+}