.TH CPUID 8
.SH NAME
cpuid \- print processor information
.SH SYNOPSIS
.B aux/cpuid
[
.B -ar
]
.SH DESCRIPTION
Intel and compatible processors since the
.SM Pentium™
(or late 486) provide the
.SM CPUID
instruction that returns information about the chip. The
.I cpuid
program enumerates and prints this information in a simple
textual format. The output consists of multiple lines prefixed
with a keyword describing the information that follows.
.PP
With the
.B -r
option, the format changes to raw hexadecimal output with the
keyword being the
.BR AX
input register to the
.SM CPUID
instruction followed by 4 colums with the output registers
.BR AX ,
.BR BX ,
.BR CX
and
.BR DX .
.PP
The
.B -a
option prints enumerated items in raw format if no
keyword is known instead of omitting it (default).
.PP
The keywords supported so far are:
.TP
.B vendor
Processor vendor string
.TP
.B procmodel, extmodel
Processor model, hexadecimal model / family id
.TP
.B features, extfeatures
Feature bits, a variable list of feature acronyms
.TP
.B procname
Processor name string
.TP
.B physbits, virtbits, guestbits
Address lines, decimal in bits
.SH EXAMPLE
.EX
term% aux/cpuid
vendor GenuineIntel
procmodel 000006b4 / 00000006
features fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 
features mmx fxsr sse 
extmodel 00000000 / 00000000
procname Mobile Intel(R) Pentium(R) III CPU - M  1133MHz
.EE
.SH SOURCE
.B /sys/src/cmd/aux/cpuid.c