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cpuctl.4freebsd
Langue: en
Version: 361868 (ubuntu - 24/10/10)
Section: 4 (Pilotes et protocoles réseau)
BSD mandoc
NAME
cpuctl - cpuctl pseudo deviceSYNOPSIS
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.conf5:
cpuctl_load="YES"
DESCRIPTION
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.
IOCTL INTERFACE
All of the supported operations are invoked using the ioctl(2) system call. Currently, the following ioctls are defined:- CPUCTL_RDMSR Fa cpuctl_msr_args_t *args
- CPUCTL_WRMSR Fa cpuctl_msr_args_t *args
- Read/write CPU machine specific register. The Vt cpuctl_msr_args_t structure is defined in In sys/cpuctl.h as:
typedef struct { int msr; /* MSR to read */ uint64_t data; } cpuctl_msr_args_t;
- CPUCTL_MSRSBIT Fa cpuctl_msr_args_t *args
- CPUCTL_MSRCBIT Fa cpuctl_msr_args_t *args
- Set/clear MSR bits according to the mask given in the data field.
- CPUCTL_CPUID Fa 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 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 size
For additional information refer to cpuctl.h
RETURN VALUES
- Bq Er ENXIO
- The operation requested is not supported by the device (e.g. unsupported architecture or the CPU is disabled)
- Bq Er EINVAL
- Incorrect request was supplied, or microcode image is not correct.
- Bq Er ENOMEM
- No physical memory was available to complete the request.
- Bq Er EFAULT
- The firmware image address points outside the process address space.
FILES
- /dev/cpuctl
SEE ALSO
hwpmc(4), cpucontrol(8)HISTORY
The driver first appeared in Fx 7.2 .BUGS
Yes, probably, report if any.AUTHORS
The module and this manual page were written by An Stanislav Sedov Aq stas@FreeBSD.org .Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre