16.3.59 rdmsr

Command:: rdmsr 0xADDR [-v VARNAME]

Read a model-specific register at address 0xADDR. If the parameter -v is used and an environment variable VARNAME is given, set that environment variable to the value that was read.

Please note that on SMP systems, reading from a MSR that has a scope per hardware thread, implies that the value that is returned only applies to the particular cpu/core/thread that runs the command.

Also, if you specify a reserved or unimplemented MSR address, it will cause a general protection exception (which is not currently being handled) and the system will reboot.