Man page - msr(4)

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Manual

msr

NAME
DESCRIPTION
NOTES
SEE ALSO

NAME

msr - x86 CPU MSR access device

DESCRIPTION

/dev/cpu/CPUNUM/msr provides an interface to read and write the model-specific registers (MSRs) of an x86 CPU. CPUNUM is the number of the CPU to access as listed in /proc/cpuinfo .

The register access is done by opening the file and seeking to the MSR number as offset in the file, and then reading or writing in chunks of 8 bytes. An I/O transfer of more than 8 bytes means multiple reads or writes of the same register.

This file is protected so that it can be read and written only by the user root , or members of the group root .

NOTES

The msr driver is not auto-loaded. On modular kernels you might need to use the following command to load it explicitly before use:

$ modprobe msr