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


     msr - x86 CPU MSR access device


     /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.


     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


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


     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at

Linux 2009-03-31 MSR(4)

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