From owner-freebsd-hackers  Tue Jun  2 20:36:30 1998
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To: "Chris Csanady" <cc@swing.ca.sandia.gov>
cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: VM Questions 
In-reply-to: Your message of "Tue, 02 Jun 1998 06:43:05 CDT."
             <199806021143.GAA12205@swing.ca.sandia.gov> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Tue, 02 Jun 1998 20:35:34 -0700
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>First, I was wondering if it is possible given a physical address,
>to copy data to it from a virtual address.  Or is a virtual mapping
>necessary?

   There must be a virtual mapping.

>The other question is how may I map user pages into the kernel?  I've
>looked through vm_map.c, and it seems that support for this is
>lacking.  To get around this for now, I am attempting to use almost
>exclusively physical address--although am now sure how it will work
>out.

   vm_map.c isn't really the right place to look. A better place would be
physio/vmapbuf/vunmapbuf in kern_physio.c and vm_machdep.c.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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