Avi Kivity wrote: > Hollis Blanchard wrote: >> On Sun, 2007-02-25 at 10:58 +0200, Avi Kivity wrote: >> >>> I'm changing the kvm userspace interface to be more friendly to other >>> archs. One issue is the PIO port size. x86 uses 16 bits to hold the >>> port size (64K ports). Is that an issue for other archs? >>> >>> I guess I could change it to __u32, but it's better to know what various >>> architectures actually require. >>> >> PowerPC doesn't have any such concept; access to ISA PIO is done by >> having the bridge translate a particular range of MMIO accesses as PIO. >> I'm no expert, but I don't know of any mainstream processor other than >> x86 that supports PIO. >> > > I think ia64 does, but it's probably exactly the same as x86.
IA64 uses a special memory range which is translated into I/O port accesses by the CPU hardware (as opposed to the I/O bridge.) Section 10.7 of volume 2 of the Itanium SDM has the details. Only 64k of I/O ports is supported. Brian J. Johnson ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kvm-devel
