Manpage of MSR

MSR

Section: Linux Programmer's Manual (4)
Updated: 2009-03-31
Index
 

NAME

msr - x86 CPU MSR access device  

DESCRIPTION

/dev/cpu/CPUNUM/msrprovides an interface to read and write the model-specific registers (MSRs) of an x86 CPU. CPUNUMis 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 msrdriver is not auto-loaded. On modular kernels you might need to use the following command to load it explicitly before use:


    $ modprobe msr 

SEE ALSO

Intel Corporation Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3B Appendix B, for an overview of the Intel CPU MSRs.


 

Index

NAME
DESCRIPTION
NOTES
SEE ALSO

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