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features of CPUs like reading/writing machine-specific registers, retrieving cpuid data, and updating microcode. - Add cpucontrol(8) utility, that provides userland access to the features of cpuctl(4). - Add subsequent manpages. The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX is created for each cpu present in the systems. The pseudo-device minor number corresponds to the cpu number in the system. The cpuctl(4) pseudo- device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID and UPDATE. The first pair alows the caller to read/write machine-specific registers from the correspondent CPU. cpuid data could be retrieved using the CPUID call, and microcode updates are applied via UPDATE. The permissions are inforced based on the pseudo-device file permissions. RDMSR/CPUID will be allowed when the caller has read access to the device node, while WRMSR/UPDATE will be granted only when the node is opened for writing. There're also a number of priv(9) checks. The cpucontrol(8) utility is intened to provide userland access to the cpuctl(4) device features. The utility also allows one to apply cpu microcode updates. Currently only Intel and AMD cpus are supported and were tested. Approved by: kib Reviewed by: rpaulo, cokane, Peter Jeremy MFC after: 1 month
117 lines
3.2 KiB
Groff
117 lines
3.2 KiB
Groff
.\" Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 4, 2008
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.Dt CPUCONTROL 8
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.Os
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.Sh NAME
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.Nm cpucontrol
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.Nd control utility for the
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.Xr cpuctl 4
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device.
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.Sh SYNOPSIS
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.Nm
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.Op Fl vh
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.Fl m Ar msr Ns Op = Ns Ar value
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.Bk
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.Ar device
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.Ek
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.Nm
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.Op Fl vh
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.Fl i Ar level
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.Bk
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.Ar device
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.Ek
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.Nm
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.Op Fl vh
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.Op Fl d Ar datadir
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.Fl u
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.Bk
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.Ar device
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.Ek
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.Sh DESCRIPTION
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The
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.Nm
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utility can be used to read and write an arbitrary machine-specific
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CPU registers via
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.Xr cpuctl 4
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controlled special device and apply the CPU firmware updates.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl d Ar datadir
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Where to look for microcode images. The option can be specified multiple times.
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.It Fl m Ar msr Ns Op = Ns Ar value
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Read/write the specified MSR. Both the MSR and the value should be given as a hex number.
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.It Fl i Ar level
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Retrieve CPUID info. Level should be given as a hex number.
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.It Fl u
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Apply CPU firmware updates. The
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.Nm
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utility will walk through the configured data directories
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and will apply all firmware patches available for this CPU.
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.It Fl v
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Increase the verbosity level.
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.It Fl h
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Show help message.
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.El
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.Sh EXIT STATUS
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The
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.Nm
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utility exits 0 on success, and >0 if an error occurs.
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.Sh EXAMPLES
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The command
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.Pp
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.Dq Li "cpucontrol -m 0x10 /dev/cpuctl0"
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.Pp
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will read the contents of TSC MSR from CPU 0.
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.Pp
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To set the CPU 0 TSC MSR register value to 0x1 issue
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.Pp
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.Dq Li "cpucontrol -m 0x10=0x1 /dev/cpuctl0"
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.Pp
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.Pp
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The command
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.Pp
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.Dq Li "cpucontrol -i 0x1 /dev/cpuctl1"
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.Pp
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will retrieve the CPUID level 0x1 from CPU 1.
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.Pp
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To perform firmware updated on CPU 0 from images located at
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.Pa /usr/local/share/cpuctl/
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use the following command:
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.Pp
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.Dq Li "cpucontrol -d /usr/local/share/cpuctl/ -u /dev/cpuctl0"
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.Sh SEE ALSO
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.Xr cpuctl 4
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.Sh BUGS
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Yes, probably, report if any.
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.Sh AUTHORS
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The
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.Nm
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utility and this manual page was written by
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.An Stanislav Sedov Aq stas@FreeBSD.org .
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