Linux 2.6 - man page for msr (linux section 4)
|Linux & Unix Commands - Search Man Pages
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
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 mem-
bers 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 3.55 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
Linux 2009-03-31 MSR(4)
All times are GMT -4. The time now is 08:52 AM.