Minor cleanups.

Improve some debugging messages.
Minor code clean ups.
Improve apmbios entry points (still untested).
diff --git a/src/boot.c b/src/boot.c
index 944eb21..76a501f 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -164,6 +164,9 @@
         return;
     }
 
+    /* Debugging info */
+    BX_INFO("Booting from %x:%x\n", bootseg, bootip);
+
     memset(&cr, 0, sizeof(cr));
     cr.ip = bootip;
     cr.cs = bootseg;