From owner-freebsd-hackers  Fri Jan 14 22:28: 8 2000
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Date: Sat, 15 Jan 2000 00:21:34 -0600
From: Chris Costello <chris@calldei.com>
Subject: Re: question regarding FreeBSD memory mgmt
In-reply-to: <200001150549.XAA01526@cs.rice.edu>
To: Mohit Aron <aron@cs.rice.edu>
Cc: freebsd-hackers@FreeBSD.ORG
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On Fri, Jan 14, 2000, Mohit Aron wrote:
> Hi,
> 	is it possible from within FreeBSD to set a range of physical/virtual
> addresses to be uncacheable ? I'm using FreeBSD-2.2.6 and I'd appreciate if
> someone can tell me functions/instructions on how to make certain memory 
> ranges to be uncachable on a Pentium III.

   STABLE (3.x) has a memcontrol(8) program that can do just that.
I don't know off hand whether it can be ported back to 2.2.6, but
it's worth a try.


   From the memcontrol(8) man page:

     set    Set memory range attributes.

            -b base
                    Memory range base address

            -l length
                    Length of memory range in bytes, power of 2

            -o owner
                    Text identifier for this setting (7 char max)

            attribute
                    Attributes applied to this range; one of uncacheable,
                    write-combine, write-through, write-back, write-protect

-- 
|Chris Costello <chris@calldei.com>
|Programmer: One who is too lacking in people skills
|            to be a software engineer.
`---------------------------------------------------


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