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download PDF document: memcontrol.8.pdf

MEMCONTROL(8) FreeBSD System Manager's Manual MEMCONTROL(8)
NAME memcontrol - control system cache behaviour with respect to memory
SYNOPSIS memcontrol list [-a] memcontrol set -b base -l length -o owner attribute memcontrol clear -o owner memcontrol 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.
The memcontrol utility 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 memcontrol utility does not attempt to enforce these rules, however the system will reject any attempt to set an illegal combination.
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, and 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.