On Wed, Aug 03, 2011 at 06:25:07PM +0200, Vasilis Liaskovitis wrote: > On Wed, Aug 03, 2011 at 12:42:11PM +0200, Jan Kiszka wrote: > > >> Why can't Seabios read to true number online CPUs from the PIIX4 device? > > >> The information is there already, no need for addition PV here. > > >> > > > Where is it in PIIX4 device? > > > > PROC registers (or however they are called). > > In qemu-kvm, the cpus_sts bitmap array in PIIX4PMState/ACPIGPE has the true > number of online CPUS. This is accessed from the DSDT hotplug method in Seabios > as "OperationRegion SystemIO" with address 0xaf00. Is this i/o address in the > piix4 spec? How can it be accessed from the rest of SeaBIOS? It seems to reside > in ACPI_PM space. > 0xaf00 is not part of PIIX4. PIIX4 supports nor cpu host plug neither pci hot plug. I haven't found any PROC register in PIIX4 spec so far. -- Gleb. -- 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
