[Lguest] My vector reserve patches etc. so Plan 9 boots.

[ron minnich]

These are against -rc4.

0002 adds the syscall_vec struct member to lguest_data.

Both plan 9 and linux boot fine. There was a little confusion on
everyone's part from the earlier discussion and the original patches:
what we needed to do was reserve a vector, not an irq. The code in
patch 0003 supports reservations of vectors so that the io_apic won't
try to use it. Although a boot-time command parameter is supported, it
is not needed for lguest to work. This code also removes the hard-code
compare to SYSCALL_VECTOR, and replaces it with a hard-code to reserve
the SYSCALL_VECTOR :-) vector. There are some unresolved questions
here, which I note in the comment for patch 0003.

patch 0004 is a slight mod of Rusty's earlier work. The change is that
we're not doing request_irq, since this is not an IRQ we want, but a
vector; and hence we don't need the null handler.

comments welcome.

ron
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