1.\" Copyright (c) 1999 Chris Costello 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd September 15, 2002 26.Dt MEMCONTROL 8 27.Os 28.Sh NAME 29.Nm memcontrol 30.Nd "control system cache behaviour with respect to memory" 31.Sh SYNOPSIS 32.Nm 33.Cm list 34.Op Fl a 35.Nm 36.Cm set 37.Fl b Ar base 38.Fl l Ar length 39.Fl o Ar owner 40.Ar attribute 41.Nm 42.Cm clear 43.Fl o Ar owner 44.Nm 45.Cm clear 46.Fl b Ar base 47.Fl l Ar length 48.Sh DESCRIPTION 49A number of supported system architectures allow the behaviour of the CPU 50cache to be programmed to behave differently depending on the region being 51written. 52.Pp 53The 54.Nm 55utility 56provides an interface to this facility, allowing CPU cache behavior to 57be altered for ranges of system physical memory. 58.Pp 59These ranges are typically power-of-2 aligned and sized, however the specific 60rules governing their layout vary between architectures. 61The 62.Nm 63utility does not attempt to enforce these rules, however the system will 64reject any attempt to set an illegal combination. 65.Bl -tag -width ".Cm clear" 66.It Cm list 67List range slots. 68.Bl -tag -width indent 69.It Fl a 70List all range slots, even those that are inactive. 71.El 72.It Cm set 73Set memory range attributes. 74.Bl -tag -width indent 75.It Fl b Ar base 76Memory range base address. 77.It Fl l Ar length 78Length of memory range in bytes, power of 2. 79.It Fl o Ar owner 80Text identifier for this setting (7 char max). 81.It Ar attribute 82Attributes applied to this range; combinations of 83.Cm force , uncacheable , write-combine , write-through , write-back , 84and 85.Cm write-protect . 86.El 87.It Cm clear 88Clear memory range attributes. 89Ranges may be cleared by owner or by 90base/length combination. 91.Pp 92To clear based on ownership: 93.Bl -tag -width indent 94.It Fl o Ar owner 95All ranges with this owner will be cleared. 96.El 97.Pp 98To clear based on the base/length combination: 99.Bl -tag -width indent 100.It Fl b Ar base 101Memory range base address. 102.It Fl l Ar length 103Length of memory range in bytes, power of 2. 104.El 105.Pp 106Base and length must exactly match an existing range. 107.El 108.Sh SEE ALSO 109.Xr mem 4 110