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