Re: Is it useful to support user level drivers

[Mike Mackovitch]

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.

--macko
SGI Graphics Kernel Engineer 1994-1999