NAME

apm − Advanced Power Management 1.2 BIOS interface

SYNOPSIS

­bind -a #P /dev
 ­/dev/apm

DESCRIPTION

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).

SOURCE

­/sys/src/9/pc/apm.c
­/sys/src/9/pc/apmjump.s

Plan 9  —  March 15, 2001