> I never understood why the PCI-bus is not a interupt vector design.
The way the story goes, it wasn't until the last minute that the initial
PCI working group realised that they'd forgotten to do something about
interrupts, and so the gross hack that we're now stuck with was
implemented.
It might be more realistic to say that PCI tries to discourage the use of
interrupts, and hardware vendors haven't really gotten the message.
You should look at recent PCI revisions, however, and the MSI
(message-signalled interrupt) mechanism which, if implemented widely,
will solve at least some of the major problems with PCI and interrupts.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
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