Re: OpenGL-based framebuffer concepts

[Jon Smirl]

On 5/23/06, Jeff Garzik <jeff@xxxxxxxxxx> 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.

--
Jon Smirl
jonsmirl@xxxxxxxxx
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/