_IO_IS_ISA question

Benjamin Herrenschmidt benh at kernel.crashing.org
Thu Mar 25 10:34:18 EST 2004

> > Paul, Ben and I were discussing it, and it would seem we can use the
> > existing exception stuff (aka get_user etc). This would remove all the
> > ISA_* checks we currently have and not require the added complexity that
> > this patch introduces.
> Ohh, yes, I like that, much better idea.  I'm guessing a little bit
> how one might do that;  I'm thinking a new 'copy_to_io' type function
> with the isa_port<0x10000 check in the ex_table code?  I'm somewhat
> confused, since bad_page_fault usually runs at the end, not at the start
> of the exception handling.

Look what ppc32 does


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