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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 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

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 3.74 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
       http://www.kernel.org/doc/man-pages/.

Linux				  2009-03-31				MSR(4)

NAME | DESCRIPTION | NOTES | SEE ALSO | COLOPHON

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