Date: Wed, 23 May 2001 21:17:18 +0100 From: Brian Somers <brian@Awfulhak.org> To: Mike Smith <msmith@FreeBSD.ORG> Cc: Brian Somers <brian@Awfulhak.org>, freebsd-arch@FreeBSD.ORG, brian@Awfulhak.org Subject: Re: RFC: unit_list routines Message-ID: <200105232017.f4NKHIF10323@hak.lan.Awfulhak.org> In-Reply-To: Message from Mike Smith <msmith@FreeBSD.ORG> of "Wed, 23 May 2001 13:17:51 PDT." <200105232017.f4NKHp400923@mass.dis.org>
next in thread | previous in thread | raw e-mail | index | archive | help
> > > >I didn't do it that way because the ``usual'' way units are allocated > > > >is sequentially. Using bits when there are large numbers of units > > > >gets awkward. I figured what was required was something small and > > > >simple that would cover the requirements of most/all drivers that > > > >need to track their units so that it's easy to find an unused one, > > > >and it's easy to allocate/deallocate things. > > > > > > How does newbus allocate/manage unit numbers ? > > > > I don't think it does. The only way to find out what's in use > > (AFAIK) is by looking at every specinfo in dev_hash.... > > Er, what exactly are you smoking? > > Newbus manages unit numbers using the devclass: > > struct devclass { > TAILQ_ENTRY(devclass) link; > driver_list_t drivers; /* bus devclasses store drivers for bus */ > char *name; > device_t *devices; /* array of devices indexed by unit */ > int maxunit; /* size of devices array */ > }; Yes, Garrett pointed this out. I misunderstood the question because newbus doesn't manage unit numbers. It ``manages'' the maximum unit number allocated and nothing else. My answer was describing the only way I know of to figure out which units for a given device are allocated/opened. > -- > ... every activity meets with opposition, everyone who acts has his > rivals and unfortunately opponents also. But not because people want > to be opponents, rather because the tasks and relationships force > people to take different points of view. [Dr. Fritz Todt] > V I C T O R Y N O T V E N G E A N C E -- Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org> <http://www.Awfulhak.org> <brian@[uk.]OpenBSD.org> Don't _EVER_ lose your sense of humour ! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200105232017.f4NKHIF10323>