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CPUCTL(4) FreeBSD Kernel Interfaces Manual CPUCTL(4)


[править] NAME

    cpuctl -- cpuctl pseudo device

[править] SYNOPSIS

    To compile this driver into the kernel, place the following lines in your
    kernel configuration file:
          device cpuctl
    Alternatively, to load the driver as a module at boot time, place the
    following in loader.conf(5):


    The special device /dev/cpuctl presents interface to the system CPU.  It
    provides functionality to retrieve CPUID information, read/write machine
    specific registers (MSR) and perform CPU firmware updates.
    For each CPU present in the system, the special device /dev/cpuctl%d with
    the appropriate index will be created.  For multicore CPUs such a special
    device will be created for each core.
    Currently, only i386 and amd64 processors are supported.


    All of the supported operations are invoked using the ioctl(2) system
    call.  Currently, the following ioctls are defined:
    CPUCTL_RDMSR cpuctl_msr_args_t *args
    CPUCTL_WRMSR cpuctl_msr_args_t *args
                   Read/write CPU machine specific register.  The
                   cpuctl_msr_args_t structure is defined in <sys/cpuctl.h>
                   typedef struct {
                           int             msr;    /* MSR to read */
                           uint64_t        data;
                   } cpuctl_msr_args_t;
    CPUCTL_MSRSBIT cpuctl_msr_args_t *args
    CPUCTL_MSRCBIT cpuctl_msr_args_t *args
                   Set/clear MSR bits according to the mask given in the data
    CPUCTL_CPUID cpuctl_cpuid_args_t *args
                   Retrieve CPUID information.  Arguments are supplied in the
                   following struct:
                   typedef struct {
                           int             level;  /* CPUID level */
                           uint32_t        data[4];
                   } cpuctl_cpuid_args_t;
                   The level field indicates the CPUID level to retrieve
                   information for, while the data field is used to store the
                   received CPUID data.
    CPUCTL_UPDATE cpuctl_update_args_t *args
                   Update CPU firmware (microcode).  The structure is defined
                   in <sys/cpuctl.h> as:
                   typedef struct {
                           void    *data;
                           size_t  size;
                   } cpuctl_update_args_t;
                   The data field should point to the firmware image of size
    For additional information refer to cpuctl.h.


    [ENXIO]            The operation requested is not supported by the device
                       (e.g. unsupported architecture or the CPU is disabled)
    [EINVAL]           Incorrect request was supplied, or microcode image is
                       not correct.
    [ENOMEM]           No physical memory was available to complete the
    [EFAULT]           The firmware image address points outside the process
                       address space.

[править] FILES


[править] SEE ALSO

hwpmc(4), cpucontrol(8)

[править] HISTORY

    The cpuctl driver first appeared in FreeBSD 7.2.

[править] AUTHORS

    The cpuctl module and this manual page were written by Stanislav Sedov

[править] BUGS

    Yes, probably, report if any.

FreeBSD 9.0 June 30, 2009 FreeBSD 9.0

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