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SubjectRe: Is it useful to support user level drivers
On Thu, Jun 21, 2001 at 03:20:12PM -0700, David S. Miller wrote:
> Pete Zaitcev writes:
> > If memory does not deceive me, SunLab Spring processed interrupts
> > in user space. I do not remember for sure, but I think QNX did, too.
> > User mode interrupt handlers are perfectly doable, provided that the
> > hardware allows to mask interrupts selectively.
> SGI's IRIX does it too, for graphics card interrupts like "VBLANK" and
> "rendering pipeline FIFO not full anymore".

Sorry, but SGI's IRIX does NOT handle graphics interrupts in user space.

SGI Graphics Kernel Engineer 1994-1999
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