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112 lines
3.3 KiB
Groff
112 lines
3.3 KiB
Groff
.\" Copyright (c) 1999 Chris Costello
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 15, 2002
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.Dt MEMCONTROL 8
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.Os
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.Sh NAME
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.Nm memcontrol
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.Nd "control system cache behaviour with respect to memory"
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.Sh SYNOPSIS
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.Nm
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.Cm list
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.Op Fl a
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.Nm
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.Cm set
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.Fl b Ar base
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.Fl l Ar length
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.Fl o Ar owner
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.Ar attribute
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.Nm
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.Cm clear
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.Fl o Ar owner
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.Nm
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.Cm clear
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.Fl b Ar base
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.Fl l Ar length
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.Sh DESCRIPTION
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A number of supported system architectures allow the behaviour of the CPU
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cache to be programmed to behave differently depending on the region being
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written.
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.Pp
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The
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.Nm
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utility
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provides an interface to this facility, allowing CPU cache behavior to
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be altered for ranges of system physical memory.
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.Pp
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These ranges are typically power-of-2 aligned and sized, however the specific
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rules governing their layout vary between architectures.
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The
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.Nm
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utility does not attempt to enforce these rules, however the system will
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reject any attempt to set an illegal combination.
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.Bl -tag -width ".Cm clear"
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.It Cm list
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List range slots.
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.Bl -tag -width indent
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.It Fl a
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List all range slots, even those that are inactive.
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.El
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.It Cm set
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Set memory range attributes.
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.Bl -tag -width indent
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.It Fl b Ar base
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Memory range base address.
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.It Fl l Ar length
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Length of memory range in bytes, power of 2.
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.It Fl o Ar owner
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Text identifier for this setting (7 char max).
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.It Ar attribute
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Attributes applied to this range; combinations of
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.Cm force , uncacheable , write-combine , write-through , write-back ,
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and
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.Cm write-protect .
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.El
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.It Cm clear
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Clear memory range attributes.
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Ranges may be cleared by owner or by
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base/length combination.
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.Pp
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To clear based on ownership:
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.Bl -tag -width indent
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.It Fl o Ar owner
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All ranges with this owner will be cleared.
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.El
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.Pp
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To clear based on the base/length combination:
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.Bl -tag -width indent
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.It Fl b Ar base
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Memory range base address.
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.It Fl l Ar length
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Length of memory range in bytes, power of 2.
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.El
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.Pp
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Base and length must exactly match an existing range.
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.El
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.Sh SEE ALSO
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.Xr mem 4
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