MEMCONFIG(8) BSD System Manager's Manual MEMCONFIG(8)NAMEmemconfig - control system cache behaviour with respect to memory
SYNOPSISmemconfig 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 be-
ing 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 ALSOmtrr(4)HISTORYmemconfig was originally introduced in FreeBSD 3.3 as memcontrol.
MirOS BSD #10-current November 14, 1999 1
