Messages in this thread | | | From | (Alan Cox) | Subject | Re: vremap and memcpy_to_fs in 2.2.x? | Date | Thu, 8 Apr 1999 03:39:20 +0100 (BST) |
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> Do you mean that the user space code always passes the framebuffer's bus > address directly to bttv, and not the user-space mapped address?
What occurs with all the right goodies set up is that the X server calls VIDIOCSFBUF to pass the physical frame buffer address.
> And that the option to pass a user space address to VIDIOCSFBUF and have > it translated, while making wild assumptions about the object mapped
That is so you can pass virtual frame buffer bases - which some ports need. It isnt used for capturing by applications. And you'll note VIDIOCSFBUF is root only, while MMAP and VIDIOCMCAPTURE are not Alan
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