apm – Advanced Power Management 1.2 BIOS interface


bind -a #P /dev



This device presents a low-level interface to the APM 1.2 bios calls. It is enabled by adding the line apm0= to plan9.ini. (The value after the equals sign is ignored; the presence of the line at all enables the driver.) It is only available on uniprocessor PCs. Writing a 386 Ureg structure and then reading it back executes an APM call: the written registers are passed to the call, and the read registers are those returned by the call.

This device is intended to enable more user-friendly interfaces such as apm(8).