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Re: Airport Extreme works on linux!

On Fri, 2005-09-16 at 14:32 +0200, Johannes Berg wrote:
> On Sat, 2005-09-03 at 17:05 +1000, Benjamin Herrenschmidt wrote:
> > What we can do is also spy all IOs to the chip and use that to
> > understand how it works, eventually writing a linux driver...
> > 
> > Note also that the OS X driver has nice readable symbols too. So if
> > somebody is really motivated, it should be possible to use both
> > techniques to properly reverse engineer it.
> We're on it. Note that the MOL thing was actually invented for this
> purpose :)

Heh, ok. A trick for spying IOs: give the driver an unmapped area of
memory instead of the IOs it expects. You'll trap on all accesses. Then
emulate the load/store access (and keep a trace).

I can send you code of a userland SEGV handler that emulates such
load/store accesses later, possibly tomorrow, if you are interested,
that I wrote for spying some video drivers for sleep issues.


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