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MSR(4)                     Linux Programmer's Manual                    MSR(4)



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 only be read and written 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

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.

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2009-03-31                            MSR(4)