Patch from Erik Ivanenko <erik.ivanenko@utoronto.ca>:

    Please find attached a start.s that includes a cli prior to the hlt
    instruction.  This ensures that external interrupts cannot restart
    the system after returning to the startup code.  ( According to the hlt
    docs, they will! )

    Also find a new timer.c.   ( I forgot to update the countdowm value
    in the timer when I changed the PSCLK frequency in start.s) .  This
    improves timer accuracy.

    The raw_idt_notify messages are no longer infinite, I tested sp11 and
    sp05, both which were bad, and I have seen the message print once in
    one test.  I think it's ok if it prints out once.  In fact, I don't
    think you can effectively stop it!

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