1 .\" Copyright (c) 2006-2008 Stanislav Sedov <stas@FreeBSD.org>
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32 .Nd cpuctl pseudo device
34 To compile this driver into the kernel,
35 place the following lines in your kernel
37 .Bd -ragged -offset indent
41 Alternatively, to load the driver as a module
42 at boot time, place the following in
44 .Bd -literal -offset indent
50 presents interface to the system CPU.
51 It provides functionality to retrieve
52 CPUID information, read/write machine specific registers (MSR) and perform
55 For each CPU present in the system, the special device
57 with the appropriate index will be created.
58 For multicore CPUs such a
59 special device will be created for each core.
61 Currently, only i386 and amd64 processors are
64 All of the supported operations are invoked using the
67 Currently, the following ioctls are defined:
68 .Bl -tag -width CPUCTL_UPDATE
69 .It Dv CPUCTL_RDMSR Fa cpuctl_msr_args_t *args
70 .It Dv CPUCTL_WRMSR Fa cpuctl_msr_args_t *args
71 Read/write CPU machine specific register.
74 structure is defined in
79 int msr; /* MSR to read */
83 .It Dv CPUCTL_MSRSBIT Fa cpuctl_msr_args_t *args
84 .It Dv CPUCTL_MSRCBIT Fa cpuctl_msr_args_t *args
85 Set/clear MSR bits according to the mask given in the
88 .It Dv CPUCTL_CPUID Fa cpuctl_cpuid_args_t *args
89 Retrieve CPUID information.
90 Arguments are supplied in
94 int level; /* CPUID level */
96 } cpuctl_cpuid_args_t;
101 field indicates the CPUID level to retrieve information for, while the
103 field is used to store the received CPUID data.
104 .It Dv CPUCTL_UPDATE cpuctl_update_args_t *args
105 Update CPU firmware (microcode).
106 The structure is defined in
113 } cpuctl_update_args_t;
118 field should point to the firmware image of size
122 For additional information refer to
127 The operation requested is not supported by the device (e.g. unsupported
128 architecture or the CPU is disabled)
130 Incorrect request was supplied, or microcode image is not correct.
132 No physical memory was available to complete the request.
134 The firmware image address points outside the process address space.
137 .Bl -tag -width /dev/cpuctl -compact
146 driver first appeared in
151 module and this manual page were written by
152 .An Stanislav Sedov Aq stas@FreeBSD.org .
154 Yes, probably, report if any.