[SeaBIOS] [PATCH] make seabios 386/486 friendly
kevin at koconnor.net
Tue Jan 24 14:32:58 CET 2012
On Tue, Jan 24, 2012 at 12:01:10PM +0100, Rudolf Marek wrote:
> Hi again,
> >I'm not sure there would be an issue with third party code (optionroms
> >/ old code changing the pit). The seabios timer users are fairly
> >straight forward - get the current value, and then wait for the
> >expected value in a loop with yield(). So, there'd only be a problem
> >if some third-party irq handler messed with the pit - if they did that
> >from a hardware irq handler, I'd guess it would break lots of things.
> >(Things are less clear with CONFIG_THREAD_OPTIONROMS, but I'd say it
> >would be safe to leave that off for your use case.)
> Well I had in mind the changes to timer_counter itself. There is an
> API to change that (1a02) and also there is a rollover. It seems
> more complex to me to handle all the cases than just use two
> variables more.
Thinking about this more, I agree with you - it's probably simpler to
just keep separate variables.
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