Messages in this thread | | | Subject | Re: [kvm-devel] PIO port width on various archs? | From | Hollis Blanchard <> | Date | Sun, 25 Feb 2007 22:27:47 -0600 |
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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.
-Hollis
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