1 .\" Copyright (c) 1999 Chris Costello
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25 .\" $FreeBSD: src/usr.sbin/memcontrol/memcontrol.8,v 1.3.2.5 2003/03/12 22:08:15 trhodes Exp $
26 .\" $DragonFly: src/usr.sbin/memcontrol/memcontrol.8,v 1.2 2003/06/17 04:29:57 dillon Exp $
28 .Dd September 28, 1999
33 .Nd "control system cache behaviour with respect to memory"
52 A number of supported system architectures allow the behaviour of the CPU
53 cache to be programmed to behave differently depending on the region being
59 provides an interface to this facility, allowing CPU cache behavior to
60 be altered for ranges of system physical memory.
62 These ranges are typically power-of-2 aligned and sized, however the specific
63 rules governing their layout vary between architectures.
66 utility does not attempt to enforce these rules, however the system will
67 reject any attempt to set an illegal combination.
68 .Bl -tag -width ".Cm clear"
71 .Bl -tag -width indent
73 List all range slots, even those that are inactive.
76 Set memory range attributes.
77 .Bl -tag -width indent
79 Memory range base address.
81 Length of memory range in bytes, power of 2.
83 Text identifier for this setting (7 char max).
85 Attributes applied to this range; combinations of
86 .Cm force , uncacheable , write-combine , write-through , write-back ,
91 Clear memory range attributes.
92 Ranges may be cleared by owner or by
93 base/length combination.
95 To clear based on ownership:
96 .Bl -tag -width indent
98 All ranges with this owner will be cleared.
101 To clear based on the base/length combination:
102 .Bl -tag -width indent
104 Memory range base address.
106 Length of memory range in bytes, power of 2.
109 Base and length must exactly match an existing range.