rdmsr —
Read Model-Specific Register
The rdmsr command can be used to read a value out of one
or more x86 MSRs, as defined by the Intel and AMD CPU specifications. The
integer MSR number should be given (typically in 0x-prefixed hexadecimal). It
is the command-line equivalent of the rdmsr()
instruction).
The read is done on the current CPU, which may change arbitrarily
between MSR reads: to read from a particular CPU,
pbind(1M) can be used to execute this utility.
The rdmsr utility exits 0 on success, or 1 if an error
occurs, or at least one MSR could not be read.
Intel 64 and IA-32 Architectures Software Developer's Manual Volume 4:
Model-Specific Registers