Gilles Chanteperdrix wrote: > Jan Kiszka wrote: > > Richard Cochran wrote: > > > I know that this is a bit off topic, yet perhaps some on this list > > > have interest or knowledge in this area. I am also posting this idea > > > to the linux-arm-kernel list. > > > > > > I would like to implement the ARM FCSE under Linux, using the Intel > > > IXP425 board. Before I start, I would like to ask: > > > > > > 1. Has any work already been done in this area? > > > > > > 2. Is there something about the current Linux MM that would make this > > > impractical? > > > > Nothing is impossible (specifically as FASS proves its feasibility), > > it's just a question how much work it is to implement it AND maintain it > > or merge it into standard Linux. And I cannot imagine ARM or its > > licensees dropping this feature without an acceptable alternative once > > Linux started to use it broadly... > > The feature was already dropped, it is deprecated in ARMv6. >
I'm not claiming to be an ARM insider, but browsing through some manuals makes me think that "The c13, Context ID Register, [...] replaces the FCSE PID register. Use of the FCSE PID Register is deprecated." Moreover: "The ARM1136JF-S processor implements the Fast Context Switch Extension (FCSE) and high vectors extension that are required to run Microsoft WindowsCE." Given this popular user, it is highly unlikely that a feature comparable to FCSE is going to be removed from the ARM architecture - at least as long as its cache is located at such an unpleasant place. Jan
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