| NAME | DESCRIPTION | NOTES | SEE ALSO | COLOPHON | The Linux Programming Interface |
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 only be read and written 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 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2009-03-31 MSR(4)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface