What is rdmsr?
What is rdmsr?
rdmsr is a tool used for reading a CPU’s machine specific registers (MSR). Note: if you’re running a Debian kernel, be sure that the msr. ko kernel module is loaded.
What are machine specific registers?
A model-specific register (MSR) is any of various control registers in the x86 instruction set used for debugging, program execution tracing, computer performance monitoring, and toggling certain CPU features.
What is an MSR number?
Definition of ‘MSR’ An MSR is a device that converts information on the magnetic stripe of a credit card into data that can be understood by retail software. Cards typically include a magnetic stripe encoded with the unique ID number allowing them to be processed with a standard MSR device.
What is MSR unit?
A machine state register (MSR) is one of three process control registers present in the PowerPC processor architecture.
What is the machine state register?
The machine state register, a single register, provides coarse-grained control over a small number of machine functions. In contrast, dozens to hundreds of model-specific registers exist on recent IA-32 and x86_64 architectures and provide a much finer granularity of both reporting and control of machine state.
What is the use of control address register?
Control memory address register specifies the address of the micro-instruction, and the control data register holds the micro-instruction read from memory, The micro-instruction contains a control word that specifies one or more micro operations for the data processor.
What is an MSR in healthcare?
Medical Summary Report (MSR)
What do you need to know about rdmsr in Debian?
rdmsr is a tool used for reading a CPU’s machine specific registers (MSR). Note: if you’re running a Debian kernel, be sure that the msr.ko kernel module is loaded. ‘modprobe msr’ should do the trick. Otherwise, you’ll get an error about rdmsr not being able to open files in /dev/cpu/…
When to use the CPUID instruction in rdmsr?
The CPUID instruction should be used to determine whether MSRs are supported (CPUID.01H:EDX [5] = 1) before using this instruction. The MSRs and the ability to read them with the RDMSR instruction were introduced into the IA-32 Architecture with the Pentium processor.
Who is the author of the rdmsr tool?
Otherwise, you’ll get an error about rdmsr not being able to open files in /dev/cpu/… rdmsr was written by Transmeta Corporation This man page was contributed by Andres Salomon < [email protected] > for the Debian GNU/Linux system (but may be used by others).
What are the special instructions for read and write MSR?
These MSRs are accessed using special instructions such as RDMSR (Read MSR), WRMSR (Write MSR), and RDTSC. Each MSR that is accessed by the RDMSR and WRMSR group of instructions is identified by a 32-bit integer.