On Sun, Jul 25, 2010 at 11:54:20AM +0300, Avi Kivity wrote: > On 07/24/2010 06:45 PM, Kevin O'Connor wrote: > >On Mon, Jul 12, 2010 at 04:13:06PM +0300, Avi Kivity wrote: > >>Does SeaBIOS use big real mode now? > >SeaBIOS calls option roms in big real mode. This is required by the > >relevant specs. > > Can you provide a pointer? See the PMM spec section 2.2 and section 3.2.4. (Sadly, I can't find a link to the PMM spec on the web anymore - hopefully you have a copy.) Also see the PCI Firmware Specification v3.0 - section 5.2.1.9. The specs don't require any code addresses to be >64K, but it does require data access over 64K. I doubt there are many systems that use a code address >64K, because an interrupt in big real mode still only stores a 16bit return address - thus an irq (or nmi) in that mode will basically cause a crash. -Kevin -- 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
