What does CPUID instruction do?

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In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU IDentification) allowing software to discover details of the processor. It was introduced by Intel in 1993 with the launch of the Pentium and SL-enhanced 486 processors.

Is CPUID privileged instruction?

The CPUID instruction is a non-privileged instruction, and can be called in user space. It nominally takes in the EAX register a code that tells what information should be returned, and returns values in the EAX, EBX, ECX and EDX registers.

What is Cpuid in Linux?

CPUID provides an interface for querying information about the x86 CPU. This device is accessed by lseek(2) or pread(2) to the appropriate CPUID level and reading in chunks of 16 bytes. A larger read size means multiple reads of consecutive levels.

How do I find CPU architecture in Linux?

This article shows how to check CPU architecture on a Linux machine.

Using lscpu command. Lscpu is a handy command to get CPU architecture information in Linux.
Using uname command. Uname provides your Linux system information and kernel version.
Using lshw Command.
Get from /proc/cpuinfo.

Which registers shows the status of the CPU?

The status register is a hardware register that contains information about the state of the processor. Individual bits are implicitly or explicitly read and/or written by the machine code instructions executing on the processor.

How do I read my CPUID?

How To Read CPUID Instruction For Each CPU on Linux With x86info and cpuid Commands

lscpu command – Show information on CPU architecture.
x86info command – Show x86 CPU diagnostics.
cpuid command – Dump CPUID information for each CPU. This is the closet tool to CPU-Z app on Linux.

How do I check my architecture?

My Computer on Desktop:

My Computer icon through Start Menu:
Right click on the My Computer icon and select Properties.
64-bit systems will include the “x64” designation in the description.
Right-click on Computer and select Properties.
You will see the designation under “System Type:” stating the system architecture.

What is data register in computer?

Computer registers are high-speed memory storing units. It is an element of the computer processor. It can carry any type of information including a bit sequence or single data. A register should be 32 bits in length for a 32-bit instruction computer.

What are some key differences between CPU-Z and GL Z?

Two Favorites: CPU-Z And GPU-Z These two small programs—which actually have nothing in common beyond the similarity of their names—let you display information about your hardware. CPU-Z does this for the CPU, motherboard, and memory. GPU-Z provides information about your graphics card.

What is SPD in CPU-Z?

SPD stands for Serial Presence Detect, and tells you the speed, bandwidth, manufacturer, voltage and other information about your memory (RAM) modules.

How do I find my CPU architecture?

What is the CPUID field?

The CPUID field is a combination of the processor family, processor model, and processor stepping reported in a hexadecimal format. Note that the CPU stepping reported in the identification utility is not the same as the Stepping field reported in Product Specifications page of the processor.

How do I find the CPUID of my processor?

CPUID Information for Intel® Processors Identification Utility The Intel® Processor Identification Utility reports the CPUID information for the tested processor, located under the CPUID DATA tab of the tool. The CPUID field is a combination of the processor family, processor model, and processor stepping reported in a hexadecimal format.

What is the CPUID instruction in Intel processors?

The CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU IDentification) for the x86 architecture allowing software to discover details of the processor. It was introduced by Intel in 1993 when it introduced the Pentium and SL-enhanced 486 processors.

How do I find the stepping value of an Intel® processor?

The Intel® Processor Identification Utility includes a field on the CPUID data tab that reports the CPU stepping information for the tested processor. This field is part of the CPUID string, and reports the actual manufacturing stepping value of the processor in hexadecimal form.