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From: rro@debussy.cs.colostate.edu (Rod Oldehoeft)
Newsgroups: comp.arch
Subject: Re: Interrupts in user space
Message-ID: <9109@ccncsu.ColoState.EDU>
Date: 18 Sep 90 22:13:16 GMT
References: <3783@goanna.cs.rmit.oz.au> <12743@encore.Encore.COM>
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In article <12743@encore.Encore.COM> jkenton@pinocchio.encore.com (Jeff Kenton) writes:
>
>All the world is not a VAX.
>

Right.  Burton Smith's Tera Horizon architecture has the capability
for testing a little bit map in the memory instruction against the tag
on a data memory word, and doing a trap to a user-defined location on
a match or mismatch, with no intervention at all by an OS.  This nifty
feature has many uses:  the definition of I-structure memory without
software intervention, boundaries around stretches of memory, etc.

I don't recall if arithmetic traps can be mapped to user routines just
as simply or not.