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32 .Nd control utility for the
44 .Fl m Ar msr Ns = Ns Ar value
50 .Fl m Ar msr Ns &= Ns Ar mask
56 .Fl m Ar msr Ns |= Ns Ar mask
68 .Fl i Ar level,level_type
82 utility can be used to read and write arbitrary machine-specific
86 It can also be used to apply CPU firmware updates.
88 The following options are available:
89 .Bl -tag -width indent
91 Where to look for microcode images.
92 The option can be specified multiple times.
94 Show value of the specified MSR.
95 MSR register number should be given as a hexadecimal number.
96 The high word is printed first, then the low word is printed second.
97 .It Fl m Ar msr Ns = Ns Ar value
100 in the specified MSR register.
103 argument can be prefixed with ~ operator.
104 In this case the inverted value of argument will be stored in the register.
105 .It Fl m Ar msr Ns &= Ns Ar mask
106 Store the result of bitwise AND operation between
108 and the current MSR value in the MSR register.
111 argument can be prefixed with ~ operator.
112 In this case the inverted value of mask will be used.
113 .It Fl m Ar msr Ns |= Ns Ar mask
114 Store the result of bitwise OR operation between
116 and the current MSR value in the MSR register.
119 argument can be prefixed with ~ operator.
120 In this case the inverted value of mask will be used.
123 Level should be given as a hex number.
124 .It Fl i Ar level,level_type
126 Level and level_type should be given as hex numbers.
128 Apply CPU firmware updates.
131 utility will walk through the configured data directories
132 and apply all firmware updates available for this CPU.
134 Increase the verbosity level.
143 .Dq Li "cpucontrol -m 0x10 /dev/cpuctl0"
145 will read the contents of TSC MSR from CPU 0.
147 To set the CPU 0 TSC MSR register value to 0x1 issue
149 .Dq Li "cpucontrol -m 0x10=0x1 /dev/cpuctl0" .
151 The following command will clear the second bit of TSC register:
153 .Dq Li "cpucontrol -m 0x10&=~0x02 /dev/cpuctl0" .
155 The following command will set the forth and second bit of TSC register:
157 .Dq Li "cpucontrol -m 0x10|=0x0a /dev/cpuctl0" .
161 .Dq Li "cpucontrol -i 0x1 /dev/cpuctl1"
163 will retrieve the CPUID level 0x1 from CPU 1.
165 To perform firmware updates on CPU 0 from images located at
166 .Pa /usr/local/share/cpuctl/
167 use the following command:
169 .Dq Li "cpucontrol -d /usr/local/share/cpuctl/ -u /dev/cpuctl0"
175 utility first appeared in
180 utility and this manual page was written by
181 .An Stanislav Sedov Aq Mt stas@FreeBSD.org .
183 Yes, probably, report if any.