From owner-freebsd-hackers  Wed Sep 10 11:07:17 1997
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To: Mike Smith <mike@smith.net.au>
cc: BRUN Philippe <philippe.brun@eurocontrol.fr>,
        FREEBSD <freebsd-hackers@FreeBSD.ORG>
Subject: Re: Arinc device driver kvtop problem 
In-reply-to: Your message of "Thu, 11 Sep 1997 02:53:13 +1000."
             <199709101653.CAA04895@word.smith.net.au> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Wed, 10 Sep 1997 11:09:38 -0700
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>I remeber correctly).  If you are running -current, all that remains is 
>to arrange (when your driver starts) for the nominated address range to 
>be reserved for your driver.
>
>You can probably arrange this using contigmalloc, eg. :
>
>contigmalloc(0x10000, M_DEVBUF, M_NOWAIT, 0xf00000, 0xf10000, 0, 0)
>
>(see sys/vm/vm_page.c)  There may be better ways to do this.

   contigmalloc() is the wrong tool for this job - it only works for normal
memory. What you want to use is pmap_mapdev() - see i386/i386/pmap.c.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project