>Number:         34597
>Category:       port-sparc
>Synopsis:       implementing another BLINK behaviour via sysctl -- how to do?
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-sparc-maintainer
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 24 20:40:00 +0000 2006
>Originator:     Andreas Wiese
>Release:        NetBSD 4.99.2
>Organization:
	BSD-Crew Dresden
>Environment:
System: NetBSD lucy.lan.instandbesetzt.net 4.99.2 NetBSD 4.99.2 (LUCY) #0: =
Thu Sep 21 23:12:25 CEST 2006 root@schroeder.lan.instandbesetzt.net:/home/a=
w/NetBSD/objdir/sys/arch/sparc/compile/LUCY sparc
Architecture: sparc
Machine: sparc
>Description:

Hi folks,

I'm trying to implement the behaviour of the BLINK option I requested in
port-sparc/34585.

I planned to do something like this in sys/arch/sparc/sparc/auxreg.c
(and something equivalent in sys/arch/sparc/dev/ebus.c):

#v+
static void
blink(void *zero)
{
	register int s;

	s =3D splhigh();
	LED_FLIP;
	splx(s);

	/* nothing new yet */
	/* that's new: */
	if(led_blink =3D=3D -1)
		s =3D (((averunnable.ldavg[0] + FSCALE) * hz) >> (FSHIFT + 1));
	else
		s =3D ((FSCALE/2) * hz) /
			between(1, (FSCALE/2) * hz, (averunnable.ldavg[0] >> led_blink));
	/* that's all that changed */
	callout_reset(&blink_ch, s, blink, NULL);
}
#v-

led_blink shouuld be an int with the following meaning:
    led_blink =3D=3D -1 -> old behaviour
    led_blink =3D=3D 0  -> duration of one cycle =3D=3D 1/loadavg (so loada=
vg =3D=3D
		    1.0  means blink one time per second)
    led_blink > 0   -> slow down the ascent of blink rate somewhat

I'd like to make this adjustable via sysctl but that's my problem:  I
don't know=20
  - where to take the sysctl node (best would be machdep, IMHO, but
    there's only CPU stuff and therefor the whole subtree is defined in
    'cpu.c', where this realy doesn't belong to.
  - where to define led_blink (it must be accessible from
    sys/arch/sparc/sparc/auxreg.c and sys/arch/sparc/dev/ebus.c

Could someone please help me or perhaps write the sysctl interface?  I'm
not very familiar with kernel hacking and I don't want to mess up with the
tidiness in kernel source.  Would be senseless if I hack this together and
someone else has to touch it for cleaning up...

>How-To-Repeat:
n/a
>Fix:
n/a

HAND & LG -- aw
np: bush (Golden State) -- 02. Golden State
--=20

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