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