cpuid, icanhasvmx – print processor information


aux/cpuid [ -ar ]

aux/icanhasvmx [ -r ]


Intel and compatible processors since the Pentiumâ„¢ (or late 486) provide the CPUID instruction that returns information about the chip. The 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.

With the -r option, the format changes to raw hexadecimal output with the keyword being the AX input register to the CPUID instruction followed by 4 colums with the output registers AX, BX, CX and DX.

The -a option prints enumerated items in raw format if no keyword is known instead of omitting it (default).

The keywords supported so far are:


Processor vendor string  

procmodel, extmodel

Processor model, hexadecimal model / family id  

features, extfeatures

Feature bits, a variable list of feature acronyms  


Processor name string  

physbits, virtbits, guestbits

Address lines, decimal in bits  

Icanhasvmx queries the virtual machine extension (VMX) capabilities. If -r is specified, it prints the results in raw hexadecimal; otherwise it produces a human-readable format. In any case it prints a summary on fd 2.


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