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MEMCONFIG(8) System Manager's Manual MEMCONFIG(8)

NAME

memconfigcontrol system cache behaviour with respect to memory

SYNOPSIS

memconfig list [-a]

memconfig set -b base -l length -o owner attribute

memconfig clear -o owner

memconfig clear -b base -l length

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.
memconfig provides an interface to this facility, allowing CPU cache behavior to be altered for ranges of system physical memory.
These ranges are typically power-of-2 aligned and sized, however the specific rules governing their layout vary between architectures. The memconfig program does not attempt to enforce these rules, however the system will reject any attempt to set an illegal combination.
The operands and their options are as follows:
 
 
list
List range slots.
 
 
-a
List all range slots, even those that are inactive.
 
 
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; combinations of force, uncacheable, write-combine, write-through, write-back, or write-protect.
 
 
clear
Clear memory range attributes. Ranges may be cleared by owner or by base/length combination.
To clear based on ownership:
 
 
-o owner
All ranges with this owner will be cleared.
To clear based on the base/length combination:
 
 
-b base
Memory range base address.
 
 
-l length
Length of memory range in bytes, power of 2.
Base and length must exactly match an existing range.

SEE ALSO

mtrr(4)

HISTORY

memconfig was originally introduced in FreeBSD 3.3 as memcontrol.
May 31, 2007 OpenBSD-5.1