Vaguely describe the frame-parameter. Beautify.
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.\" $NetBSD: hardclock.9,v 1.2 2008/04/30 13:10:58 martin Exp $
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.\" $NetBSD: hardclock.9,v 1.3 2010/03/25 15:17:38 jruoho Exp $
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.\"
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.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 5, 2001
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.Dd March 25, 2010
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.Dt HARDCLOCK 9
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.Os
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.Sh NAME
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.Nd real-time timer
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.Sh SYNOPSIS
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.Ft void
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.Fn hardclock "struct clockframe *"
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.Fn hardclock "struct clockframe *frame"
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.Sh DESCRIPTION
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The
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.Fn hardclock
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function gets called
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function is called
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.Xr hz 9
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times per second.
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It performs different tasks:
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.Bl -bullet -compact
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It implements the real-time system clock.
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The argument
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.Va frame
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is an opaque,
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machine-dependent structure that encapsulates the previous machine state.
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.Pp
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The
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.Fn hardclock
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performs different tasks such as:
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.Bl -bullet -offset indent
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.It
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Run the current process's virtual and profile time (decrease the
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corresponding timers, if they are activated, and generate
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