[SeaBIOS] varlow/extrastack vs code

Kevin O'Connor kevin at koconnor.net
Sat Feb 18 04:45:58 CET 2017


On Fri, Feb 17, 2017 at 02:12:57PM +0100, Paolo Bonzini wrote:
> On 15/02/2017 18:35, Dr. David Alan Gilbert wrote:
> > Yes it seems to.
> > One worry is that if we ever fix the qemu triple-fault so it really
> > does what you're describing and only resets the CPU, then I'm not
> > sure your int3 is the right choice.
> > 
> > The other question is whether that protected-mode exit switch
> > works in practice on qemu; it's going to come back with a lot of it's
> > devices reset.
> 
> Right, keyboard reset (and port 92h reset) should be an INIT and not a
> full system reset.  But that's also something that should be fixed, not
> a quirk to rely on...

Could we rely on the pci reset mechanism (port 0xcf9)?

-Kevin



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