Date: Wed, 6 Aug 2003 13:00:13 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: ticso@cicely.de Subject: Re: How to get a device_t Message-ID: <20030806110013.GE32228@cicely12.cicely.de> In-Reply-To: <40470.1060166743@critter.freebsd.dk> References: <20030806104001.GD32228@cicely12.cicely.de> <40470.1060166743@critter.freebsd.dk>
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On Wed, Aug 06, 2003 at 12:45:43PM +0200, Poul-Henning Kamp wrote: > In message <20030806104001.GD32228@cicely12.cicely.de>, Bernd Walter writes: > >On Wed, Aug 06, 2003 at 12:18:28PM +0200, Poul-Henning Kamp wrote: > >> In message <20030806101148.GC32228@cicely12.cicely.de>, Bernd Walter writes: > >> >>From the logicaly standpoint the extensions had to be attached to > >> >nexus, but nowhere is the current code path there is a handle for > >> >nexus or any other device_t. > >> > >> In fact what you may want to do is hang the entire MMCR off the nexus > >> as a bus, and hang the various drivers off that bus. > > > >What needs to be in *_probe() to conditionalize on elan existence? > > Well, my idea was to hang the mmcr bus on nexus when we find out it > is an elan. Back to the original question: How do I get the device_t from nexus? Is there a get_nexus() function somewhere? > It may be that you are not allowed to attach a bus to the nexus when > we find out it is an elan in the host/pci bridge probe, but then I guess > you could just hang it off that instead. There is also no other device_t in the code path available. The last function knowing a device_t is nexus_pcib_identify. We then have to pass this as an argument to nexus_pcib_is_host_bridge(). > Pressumably some newbus magic will then probe that bus. If its not > an elan, there is no mmcr bus and nothing will get probed. Yes - that part is clear. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de
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