Date: Sun, 6 Jul 2014 18:29:22 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Don Lewis <truckman@freebsd.org> Cc: "freebsd-arch@freebsd.org" <arch@freebsd.org> Subject: Re: [patch] axe RF_TIMESHARE? Message-ID: <CAJ-Vmong-1_k=TBugK5kvKnp-tUeJ3w5fXTzSXQsyYhD1UUf0w@mail.gmail.com> In-Reply-To: <201407070047.s670lWUv022054@gw.catspoiler.org> References: <CAJ-VmokLfZ1kwqCeCmbJmxBgZXCgdc=9BTD1Feyf0_%2BVPiZKmA@mail.gmail.com> <201407070047.s670lWUv022054@gw.catspoiler.org>
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On 6 July 2014 17:47, Don Lewis <truckman@freebsd.org> wrote: > On 6 Jul, Adrian Chadd wrote: >> Hi, >> >> What's it supposed to be used for? > > My understanding it that it is supposed to be used to allow two more > devices to claim the same resource, such as an I/O port range, but only > one device can be active at a time. Interesting. I wonder what kinds of things would want to do this. There's a few interesting things like implementing the spibus using this instead of the current way of calling a bus lock method before doing any bus IO. -a
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