On 05/12/2010 07:55 PM, Stefano Stabellini wrote:
3CEh index 26h W(R/W): BLT Source Pitch (5426 +)
bit 0-11 (5426-28) Number of bytes in a scanline at the source.
0-12 (5429 +) do
if the source BLT is supposed to be the number of bytes in a scanline at
the source, then 0 is not a correct value for it.
It's useful if you have a one-line horizontal pattern you want to
propagate all over.
It might be useful all right, but it is not entirely clear what the
hardware should do in this situation from the documentation we have, and
certainly the current state of the cirrus emulation code doesn't help.
Without any clear indication of what a Cirrus Logic graphic card would
have done here, I would choose the safest answer that is disregard the
"delicate" case (if it doesn't break Windows NT).
My guess is that the src or dst address simply doesn't increment. I
think it's also fine to ignore the operation completely.
However I don't mind if we try to handle this case too, provided
that we handle it well, without SIGFPEs that is :)
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
