Date: Fri, 14 Aug 1998 11:40:15 +0930 From: Greg Lehey <grog@lemis.com> To: Mike Smith <mike@smith.net.au>, Karl Pielorz <kpielorz@tdx.co.uk> Cc: hackers@FreeBSD.ORG Subject: Re: Device / Driver presentation advice needed... Message-ID: <19980814114015.K1921@freebie.lemis.com> In-Reply-To: <199808131717.KAA00818@antipodes.cdrom.com>; from Mike Smith on Thu, Aug 13, 1998 at 10:17:47AM -0700 References: <35D29E32.81A62F7D@tdx.co.uk> <199808131717.KAA00818@antipodes.cdrom.com>
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On Thursday, 13 August 1998 at 10:17:47 -0700, Mike Smith wrote: >> Hi All, >> >> I'm now getting on quite well with the device driver I'm writing, but I'm stuck >> as to how best it is to present the 'device' to the outside world... >> >> If I reserve 3 bits of the minor number to indicate the actual card in the >> system, I can then use the remaining 5 bits to give different 'presentations' of >> the device (Is this good practice?) > > It's one way to do it. There is a lot more room in the minor though; > 32 bits in fact. 24 bits. The total 32 bit word includes 8 bits of major number. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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