linux-kernel - Re: [kvm-devel] PIO port width on various archs?

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Date:	Sun, 25 Feb 2007 22:27:47 -0600
From:	Hollis Blanchard <hollis@...guinppc.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [kvm-devel] PIO port width on various archs?

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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