Date: Wed, 30 Jul 1997 12:41:26 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: vinay@agni.nuko.com (Vinay Bannai) Cc: dg@root.com, terry@lambert.org, freebsd-hackers@FreeBSD.ORG Subject: Re: Location of copyin() and copyout().. Message-ID: <199707300311.MAA17635@genesis.atrad.adelaide.edu.au> In-Reply-To: <199707300227.TAA05696@agni.nuko.com> from Vinay Bannai at "Jul 29, 97 07:27:30 pm"
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Vinay Bannai stands accused of saying: > > So in a situation where I pin the user pages down (for DMA), it is okay to > use copyin()/copyout(). You don't have to pin them down for copyin/copyout, but it will work fine, yes. > In the meantime, I am having a little trouble with the code that is > running on the i960 board. It is essentially probed/attached/mmapped from > the host side. It mostly pertains to style and structure on the code that > is running on the i960 board. The card offers a broad functionality > (depending on the code running on the board). How do I offer these > services thru the device driver end on the host side? For instance I can't > seem to map the functiions provided by the i960 processor onto the > ioctl(). I am ignoring the I2O model for the time being. I want to be able > to get the initial prototype atleast working before I touch the I20 > specs... Hohohoho, you're working on I2O? 8) I'd be inclined to write the driver as really nothing more than something that provides the probe/attach/map functionality, and then write another layer that sits on top that speaks the protocol that the software on the card does, using the comms facilities that the lower layer driver offers. This allows you to swap upper layers as you swap software on the card. -- ]] Mike Smith, Software Engineer msmith@gsoft.com.au [[ ]] Genesis Software genesis@gsoft.com.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control. (ph) +61-8-8267-3493 [[ ]] Unix hardware collector. "Where are your PEZ?" The Tick [[
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