Linux Programmer’s Manual
cpuid − x86 CPUID access device
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 lev els.
The lower 32 bits of the file position is used as the incoming %eax, and the upper 32 bits of the file position
as the incoming %ecx, the latter intended for "counting" eax levels like eax=4.
This driver uses /dev/cpu/CPUNUM/cpuid , where CPUNUM is the minor number, and on an SMP box will
direct the access to CPU CPUNUM as listed in /proc/cpuinfo.
This file is protected so that it can only be read by the user root, or members of the group root.
The CPUID instruction can be directly executed by a program using inline assembler. Howev er this device
allows convenient access to all CPUs without changing process affinity.
Most of the information in cpuid is reported by the kernel in cooked form either in /proc/cpuinfo or
through subdirectories in /sys/devices/system/cpu. Direct CPUID access through this device should only be
used in exceptional cases.
The cpuid driver is not auto-loaded. On modular kernels you might need to use the following command to
load it explicitly before use:
$ modprobe cpuid
There is no support for CPUID functions that require additional input registers.
Very old x86 CPUs don’t support CPUID.
Intel Corporation, Intel 64 and IA-32 Architectures Software Developer’s Manual Volume 2A: Instruction
Set Reference, A-M, 3-180 CPUID reference.
Intel Corporation, Intel Processor Identification and the CPUID Instruction, Application note 485.
This page is part of release 3.24 of the Linux man-pages project. A description of the project, and informa-
tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.