|| Linux Programmer's Manual
NAME msr - x86 CPU MSR access device
provides an interface to read and write the model-specific registers (MSRs) of an x86 CPU.
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
, or members of the group
driver is not auto-loaded. On modular kernels you might need to use the following command to load it explicitly before use:
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 3.53 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/.