term% cat index.txt APM(3) Library Functions Manual APM(3)
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 en‐
ables 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
APM(3)