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-.\" LP (Laptop Package)
-.\" 
-.\" Copyright (c) 1994 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
-.\" 
-.\" This software may be used, modified, copied, and distributed, in
-.\" both source and binary form provided that the above copyright and
-.\" these terms are retained. Under no circumstances is the author 
-.\" responsible for the proper functioning of this software, nor does 
-.\" the author assume any responsibility for damages incurred with its 
-.\" use.
-.Dd November 1, 1994
-.Dt APM 4
-.Os
-.Sh NAME
-.Nm apm
-.Nd APM BIOS interface
-.Sh SYNOPSIS
-.Cd options APM
-.Cd device apm0 at isa?
-.Sh DESCRIPTION
-.Nm apm
-is an interface to the Intel / Microsoft APM (Advanced Power Management) BIOS
-on laptop PCs.
-.Pp
-.Nm apm
-provides the following power management functions.
-.Bl -enum -offset indent
-.It
-When the system wakes up from suspended mode, 
-.Nm apm
-adjusts the system clock to RTC.
-.It 
-When the system wakes up from suspended mode, 
-.Nm apm
-passes a message to 
-.Xr syslogd 8
-comprising of system wakeup time and elapsed time during suspended mode.
-.It
-.Nm apm
-slows CPU clock when there are no system activities (runnable processes, 
-interrupts, etc.).  This function is available only on systems whose APM 
-supports CPU idling.
-.It
-.Nm apm
-exports an application interface as a character device.  Applications
-can control APM, or retrieve APM status information via this interface.
-.Nm apm
-exports the following interfaces.  These symbols are defined in
-.Dq Pa /usr/include/machine/apm_bios.h.
-.Bl -tag -width 4n -offset indent
-.It Sy APMIO_SUSPEND
-Suspend system.
-.It Sy APMIO_GET
-Get power management information.
-.It Sy APMIO_ENABLE
-.It Sy APMIO_DISABLE
-Enable / Disable power management.
-.It Sy APMIO_HALTCPU
-.It Sy APMIO_NOTHALTCPU
-Control execution of HLT in the kernel context switch routine.
-.Pp
-Some APM implementations execute the HLT 
-.Pq Halt CPU until an interrupt occurs
-instruction in the
-.Dq Pa Idle CPU
-call, while others do not.  Thus enabling this may result in
-redundant HLT executions because
-.Dq Pa Idle CPU
-is called from the kernel context switch routine that inherently executes 
-HLT. This may reduce peak system performance.  
-.Pp
-Also the system hangs up if HLT instruction is disabled in the kernel 
-context switch routine, and if the APM implementation of the machine 
-does not execute HLT in
-.Dq Pa Idle CPU.
-On some implementations that do not support CPU clock slowdown, APM 
-might not execute HLT.
-.Nm apm
-disables
-.Sy APMIO_NOTHALTCPU
-operation on such machines. 
-.Pp
-The current version of
-.Nm apm
-does not call
-.Dq Pa Idle CPU
-from the kernel context switch routine if clock slowdown is not supported, 
-and it executes HLT instruction by default.  Therefore, there is 
-no need to use these two operations in most cases.
-.El
-.Pp
-These interfaces are used by
-.Xr apm 8
-and
-.Xr apmconf 8 .
-.It
-.Nm apm
-polls APM events and handles the following events.
-.Bl -column PMEV_POWERSTATECHANGEXXX "suspend system xxxxx" 
-.It Sy "Name                  " "Action          " "Description"
-.It Dv "PMEV_STANDBYREQ       " No "suspend system  " "standby request"
-.It Dv "PMEV_SUSPENDREQ       " No "suspend system  " "suspend request"
-.It Dv "PMEV_USERSUSPENDREQ   " No "suspend system  " "user suspend request"
-.It Dv "PMEV_CRITSUSPEND      " No "suspend system  " "critical suspend request"
-.It Dv "PMEV_NORMRESUME       " No "resume system   " "normal resume"
-.It Dv "PMEV_CRITRESUME       " No "resume system   " "critical resume"
-.It Dv "PMEV_STANDBYRESUME    " No "resume system   " "standby resume"
-.It Dv "PMEV_BATTERYLOW       " No "notify message  " "battery low"
-.It Dv "PMEV_UPDATETIME       " No "adjust clock    " "update time"
-.El
-.El 
-.Sh BUGS
-WARNING!  Many, if not most, of the implementations of APM-bios in laptops
-today are buggy.  You may be putting your LCD-display and batteries at
-a risk by using this interface.  (The reason this isn't a problem for
-MS-windows is that they use the real-mode interface.)  If you see any
-weird behaviour from your system with this code in use, unplug the
-power and batteries ASAP, if not imidiately, and disable this code.
-.Pp
-We are very interested in getting this code working, so please send you
-observations of any anormalous behaviour to us.
-.Pp
-When 
-.Nm apm
-is active, calling the BIOS setup routine by using hotkeys, 
-may cause serious trouble when resuming the system.
-BIOS setup programs should be called during bootstrap, or from DOS.
-.Pp
-Some APM implementations cannot handle events such as pushing the 
-power button or closing the cover.  On such implementations, the system 
-.Ar must
-be suspended
-.Ar only
-by using 
-.Xr apm 8
-or 
-.Xr zzz 8 .
-.Pp
-Disk spindown, LCD backlight control, and power on demand have not 
-been supported on the current version.
-.Sh SEE ALSO
-.Xr apm 8 ,
-.Xr zzz 8 ,
-.Xr apmconf 8
-.Sh AUTHOR
-HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp> (Keio Univ., Japan)