envctrl —
Sun Ultra Enterprise 450 environmental monitoring
The envctrl driver provides thermal monitoring of
  processors and power supplies, as well as automatic fan regulation. The driver
  attaches to the SUNW,envctrl subsystem found on Ultra Enterprise 450 systems.
The following sensors can be queried with
    envstat(8):
  
    | Sensor | Units | Description | 
  
    | CPU0 | degC | Processor 0 temperature | 
  
    | CPU1 | degC | Processor 1 temperature | 
  
    | CPU2 | degC | Processor 2 temperature | 
  
    | CPU3 | degC | Processor 3 temperature | 
  
    | PS0 | degC | Power supply 0 temperature | 
  
    | PS1 | degC | Power supply 1 temperature | 
  
    | PS2 | degC | Power supply 2 temperature | 
  
    | ambient | degC | Ambient temperature | 
  
    | cpufan
      voltage | V | Voltage used to drive processor fans | 
  
    | psfan
      voltage | V | Voltage used to drive power supply fans | 
  
    | ps
      failed | count | number of failed power supplies | 
  
    | fans
      failed | count | number of failed fans | 
The envctrl driver first appeared in
  NetBSD 5.0.
The driver doesn't support SUNW,envctrltwo found on the Ultra Enterprise 250.
Environmental interrupts are not supported.