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2006-09-08xv6 stylersc1-23/+22
2006-09-07fix ide, pit interfacesrsc1-1/+1
2006-09-07run without lapic and ioapic, if they are not presentkaashoek1-0/+46
if no lapic available, use 8253pit for clock now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)