Re: vm86 in kernel [was: vesafb...]

[Alan Cox]

> and synchronization and one or multiple vm86(2). Executing the real mode
> code happens in a kind of mini-emulator if I understood the LRMI code
> correctly. This I suppose is not a particularly light operation.

Not very light at all

> However this poses no problem with the type of operations (set mode
> etc.) which the daemon currently implements. However I can drive the
> vesafbd process upto 20 percent in top when pushing mouse wildly around
> on a virtual screen in X (on P133). 

set mode should work fine, also 1.2 bank switching with a little care

> multi-head support in vesafb too. Are these documents (I'd be interested
> in DDC aswell) available free from anywhere? I guess not or VESA wouldn't
> be asking $550 in total for the both of them.

VESA make a small number of docs available for free. The VBE 3.0 interface
doc (covers 2.0 and 1.2) is one of them

> which would be extremely useful. DDC/AF and other code for which
> programming information is unreachable could be useful for fbdev in
> general (in case of DDC).

DDC stuff can be found in the current RH installer I think (also using lrmi)