[SeaBIOS] [PATCH 12/12] Implement call32 mechanism using SMIs.

[Kevin O'Connor]

On Thu, Oct 02, 2014 at 09:38:45PM +0200, Paolo Bonzini wrote:
> Il 30/09/2014 20:38, Kevin O'Connor ha scritto:
> > +    config CALL32_SMM
> > +        bool
> > +        depends on USE_SMM
> > +        default y
> 
> I think it is a bit too early to make this the default.

Thanks for reviewing.  The CONFIG_CALL32_SMM is currently only present
to reduce the code size in non-qemu configs.  It could be promoted to
a user visible config choice, but I don't think many people would want
to change it (it's currently only applicable to QEMU TCG anyway).

> Also, it will be false on regular hardware---any plans to change this?
> Port 0xb2 is more or less universal, though enabling it requires
> chipset-specific initialization.

I think it would be useful to have this (or something similar) on kvm,
coreboot, and csm.  On coreboot, I imagine the coreboot code would
have the smm handler and a coreboot table would pass in the port and
equivalent of CALL32SMM_CMDID to activate the support in seabios.  On
kvm, I think the easiest would be to get psuedo smm support working in
kvm.  Not sure the best way to do it on CSM.  I haven't looked at this
in any depth though.

-Kevin