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DateWed, 24 May 2006 01:24:27 -0400
FromJeff Garzik <>
SubjectRe: OpenGL-based framebuffer concepts
Jon Smirl wrote:
> On 5/23/06, Jeff Garzik <jeff@garzik.org> wrote:
>> OTOH, I think a perfect video driver would be in kernel space, and do
>>>> * delivery of GPU commands from userspace to hardware, hopefully via
>> zero-copy DMA.  For older cards without a true instruction set, "GPU
>> commands" simply means userspace prepares hardware register
>> read/write/test commands, and blasts the sequence to hardware at the
>> appropriate moment (a la S3 Savage's BCI).
> 
> You have to security check those commands in the kernel driver to keep
> normal users from using the GPU to do nasty things. Users can only
> play with memory that they own and no ones else's.

Obviously.

	Jeff



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