You map kernel space into user memory and then DMA into kernel space.
> Is there example code? What if I wish to use th MIT SHM extension for X to
> transfer the data to the X framebuffer? Is it possible this way to
If the card can do clever stuff (eg like the TV capture cards) you want to
DMA direct to frame buffer when possible.
> card (which is also PCI of course)? The data doesn't need to be processed,
> the framegrabber hardware arranges things to that the data is already in the
> right format needed for X.
Take a look at the video4linux api and the bttv and zoran chip drivers
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