60 second Timer with Shell Script

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LEARN ABOUT FREEBSD

i8254

ATTIMER(4)						   BSD Kernel Interfaces Manual 						ATTIMER(4)

NAME

     attimer -- i8254 Programmable Interval Timer (AT Timer) driver

SYNOPSIS

     This driver is a mandatory part of x86 kernels.

     The following tunables are settable from the loader(8):

     hint.attimer.X.clock
     controls support for the event timer functionality.  Setting this value to 0 disables it.	The default value is 1.

     hint.attimer.X.timecounter
     controls support for the time counter functionality.  Setting this value to 0 disables it.  The default value is 1.

     hw.i8254.freq
     allows overriding the default counter frequency.  The same value is also available at run-time via the machdep.i8254_freq sysctl.

DESCRIPTION

     This driver uses i8254 Programmable Interval Timer (AT Timer) hardware to supply the kernel with one timecounter and one event timer, and to
     generate sound tones for the system speaker.  This hardware includes three channels.  Each channel includes a 16 bit counter which decreases
     with a known, platform-dependent frequency.  Counters can operate in several different modes, including periodic and one-shot.  The output of
     each channel has platform-defined wiring: one channel is wired to the interrupt controller and may be used as event timer, one channel is
     wired to the speaker and used to generate sound tones, and one timer is reserved for platform purposes.

     The attimer driver uses a single hardware channel to provide both time counter and event timer functionality.  To make this possible, the
     respective counter must be running in periodic mode.  As a result, the one-shot event timer mode is supported only when time counter func-
     tionality is disabled.

     The event timer provided by the driver is irrelevant to CPU power states.

SEE ALSO

     apic(4), atrtc(4), eventtimers(4), hpet(4), timecounters(4)

BSD
								   May 26, 2014 							       BSD

Shell Programming and Scripting