1 .\" Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>.
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32 .Nd control utility for the
38 .Fl m Ar msr Ns Op = Ns Ar value
58 utility can be used to read and write arbitrary machine-specific
62 It can also be used to apply CPU firmware updates.
64 The following options are available:
65 .Bl -tag -width indent
67 Where to look for microcode images.
68 The option can be specified multiple times.
69 .It Fl m Ar msr Ns Op = Ns Ar value
70 Read/write the specified MSR.
71 Both the MSR and the value should be given as a hex number.
74 Level should be given as a hex number.
76 Apply CPU firmware updates.
79 utility will walk through the configured data directories
80 and apply all firmware updates available for this CPU.
82 Increase the verbosity level.
91 .Dq Li "cpucontrol -m 0x10 /dev/cpuctl0"
93 will read the contents of TSC MSR from CPU 0.
95 To set the CPU 0 TSC MSR register value to 0x1 issue
97 .Dq Li "cpucontrol -m 0x10=0x1 /dev/cpuctl0"
101 .Dq Li "cpucontrol -i 0x1 /dev/cpuctl1"
103 will retrieve the CPUID level 0x1 from CPU 1.
105 To perform firmware updates on CPU 0 from images located at
106 .Pa /usr/local/share/cpuctl/
107 use the following command:
109 .Dq Li "cpucontrol -d /usr/local/share/cpuctl/ -u /dev/cpuctl0"
115 utility first appeared in
118 Yes, probably, report if any.
122 utility and this manual page was written by
123 .An Stanislav Sedov Aq stas@FreeBSD.org .