Constify the what/name parameter of pci_intr_establish().

Tested by myself, sthen, oga, kettenis, and jasper.
Input from sthen and jasper.

ok kettenis

(Manpage follows shortly.)

Improve eisa bus probe by deciding the number of logical eisa slots from
the motherboard eisa id, instead of using a ``one size fits all'' value which
is too large on more than half the eisa-capable

Improve eisa bus probe by deciding the number of logical eisa slots from
the motherboard eisa id, instead of using a ``one size fits all'' value which
is too large on more than half the eisa-capable alpha designs.

The id -> slot # logic is based on the alpha ECU configuration files, so we
should not perform worse than ECU itself (and see all slots ECU sees too).

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Add code to walk the eisa configuration, from NetBSD. This configuration
is not used yet, but this seems to ``warm up'' the eisa chips so that
accesses to the eisa bus later do not cause machine chec

Add code to walk the eisa configuration, from NetBSD. This configuration
is not used yet, but this seems to ``warm up'' the eisa chips so that
accesses to the eisa bus later do not cause machine checks.

show more ...

Final __P removal plus some cosmetic fixups

First round of __P removal in sys

Merge to NetBSD 961020. Retained our kernel APIs where NetBSD has changed.
-Wall -Wstrict-prototypes -Wmissing-prototypes too.

Add OpenBSD tags. Adapt to OpenBSD *_intr_establish calling convention

sync to 0616, retaining local diffs