Date: Sat, 15 Jan 2000 00:21:34 -0600 From: Chris Costello <chris@calldei.com> To: Mohit Aron <aron@cs.rice.edu> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: question regarding FreeBSD memory mgmt Message-ID: <20000115002134.A43216@holly.calldei.com> In-Reply-To: <200001150549.XAA01526@cs.rice.edu> References: <200001150549.XAA01526@cs.rice.edu>
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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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