cpu man page on MirBSD

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CPU(4)			BSD Programmer's Manual (i386)			CPU(4)

NAME
     cpu - Central Processing Unit

SYNOPSIS
     option I386_CPU
     option I486_CPU
     option I586_CPU
     option I686_CPU

DESCRIPTION
     Several processor models have additional features that extend their base
     functionality, such as power and frequency control or additonal instruc-
     tions.

FREQUENCY CONTROL
     The sysctl(3) hw.cpuspeed will return the current operating frequency of
     the processor. If possible, speed may be adjusted by altering hw.setperf
     from 0 to 100, representing percentage of maximum speed. There are
     several possible implementations for setperf, all transparent to the
     user. In systems with more than one control capability, they are pre-
     ferred in the order given.

     LongRun	 Found on Transmeta Crusoe processors, offers frequency scal-
		 ing with numerous positions. The processor dynamically ad-
		 justs frequency in response to load, the setperf value is in-
		 terpreted as the maximum.

     EST	 Enhanced SpeedStep found on Intel Pentium M processors,
		 offers frequency scaling with numerous positions.

     SpeedStep	 Found on some Intel Pentium 3 and newer mobile chips, it is
		 capable of adjusting frequency between a low and high value.
		 Only enabled on some chipsets.

     TCC	 Thermal Control Circuit found on Intel Pentium 4 and newer
		 processors, adjusts processor duty cycle in 12.5 percent in-
		 crements.

     PowerNow	 Found on various AMD processors. Currently only supports some
		 models in the K6 family.

INSTRUCTION SET EXTENSIONS
     The presence of extended instruction sets can be determined by sysctl
     machdep.

     osfxsr	 Supports the fxsave instruction.

     sse	 Supports the SSE instruction set.

     sse2	 Supports the SSE2 instruction set.

     xcrypt	 Support the VIA AES encryption instruction set. If this is
		 supported, the libcrypto EVP AES functions will automatically
		 use this support.

SEE ALSO
     ichpcib(4), npx(4), sysctl(8)

MirOS BSD #10-current		March 15, 2004				     1
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