>
> Hmmm... OK, but this gives us only the VT's, keyboards and mice - the
> video problem is the same, isn't it? That is, unless we want to use
> the fbdev, losing all acceleration and support for many cards. Or am
> I wrong - is there some acceleration in the framebuffer and its X
> driver?
You are wrong. There is no accelleration in fbdev. I did not just contradict myself.
it will become clear further down this message.
> XFree
> currently expects that it is the only program accessing any video
> hardware,
XFree assumes it is the only program accessing that particular card.
> If I remember correctly, the original VGA has I/O ports at somewhere
> around 0x3C0, and memory at ...
> Again, if I understand correctly, for multiple X servers we would
> have to isolate all shared I/O port accesses and enclose them in
> lock acquire/lock release. For the rest of the servers' lifetime
> (when no mode change is occuring), the cards' I/O access should stay
> disabled. Right?
Wrong.
> Now, please tell me, someone knowledgeable, if my above written
> guesses and conclusions are anywhere near the truth. :-) Thanks.
Nope.
> In the positive case, is it even possible to isolate I/O accesses in
> a driver-independent way? Where would I start? I'm willing to try to
> do the hard work, but I need guidance from someone who understands
> XFree internals. (Even then, it may prove to be too much for me...)
>From `man 5 XF86Config`:
DEVICE SECTION
...
BusID "bus-id"
This specifies the bus location of the graphics card. For PCI/AGP
cards, the bus-id string has the form PCI:bus:device:func
tion (e.g., "PCI:1:0:0" might be appropriate for an AGP card). This
field is usually optional in single-head configurations
when using the primary graphics card. In multi-head configurations, or
when using a secondary graphics card in a single-head
configuration, this entry is mandatory. Its main purpose is to make an
unambiguous connection between the device section and
the hardware it is representing. This information can usually be found
by running the X server with the -scanpci command line
option.
In other words, all the work involving the Video card is already done. It might even
work with cards that do multiple heads on the same card (the function parameter).
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