> With a properly designed kernel driver the X server does not need
> to map the hardware into user space and run as root.

How do you efficiently control the hardware then without incuring the overhead
of user/system transition on ioctl's? How many iotcl's and at what granularity
are you suggesting?

Are you assuming a device which can read and execute register settings from a
memory buffer, e.g. the dma ring buffer style devices?

John






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