Local APIC

- local APIC timer used as the source of time

- PIC is still used as the hw interrupt controller as we don't have
  enough info without ACPI or MPS to set up IO APICs

- remapping of APIC when switching paging on, uses the new mechanism
  to tell VM what phys areas to map in kernel's virtual space

- one more step to SMP

based on code by Arun C.

kernel/glo.h

@@ -62,6 +62,10 @@ EXTERN u32_t magictest;			/* global magic number */
 EXTERN int verboseflags;
 #endif
 
+#ifdef CONFIG_APIC
+EXTERN int config_no_apic; /* optionaly turn off apic */
+#endif
+
 /* VM */
 EXTERN int vm_running;
 EXTERN int catch_pagefaults;