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INT
58h,
Function
-
Power
Off
Entry:
AH
=
(function
code)
Exit:
Does
not
return
This
function
causes
the
main power
to
the
CPU
to
be
shut
off.
It
will
be
called
by
the
Power
low/off
hook
(INT
4Eh) as
part of the
normal
power
off
sequence.
It
is
also called
by
the
Microsoft
code
to turn
the
power
off
if
the
machine has been
idle for
a
certain length
of
time,
or
if
the user
explicitly
turns the
power
off
through
software.
It
does
not
return.
When
power
is
restored, either via
the
power
switch
or
some
automatic
mechanism
(such as the
alarm),
control
is
transferred
to
the Microsoft
code
as
described
in
the
Power
On
section
of this
document.
171
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