Re: IOMemoryDescriptor: Jedai trick for the tortuous
Re: IOMemoryDescriptor: Jedai trick for the tortuous
- Subject: Re: IOMemoryDescriptor: Jedai trick for the tortuous
- From: Herbie Robinson <email@hidden>
- Date: Sun, 6 Oct 2002 22:35:58 -0400
While playing with IOMemoryDescriptor, I've tried something tortuous that
happens not only to work, but turns out to be extremely useful for a sound
driver
The game is to allocate some memory, get a list of physical ranges it
occupies, and remap them *twice* end to end.
Be aware that this trick will cause TLB thrashing on some hardware
(don't know if that applies to the PPC or not). In most cases, it's
probably not worth it, but YMMV.
--
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