* Copyright (c) University of British Columbia, 1984
* Copyright (c) 1990 The Regents of the University of California.
* This code is derived from software contributed to Berkeley by
* the Laboratory for Computation Vision and the Computer Science Department
* of the University of British Columbia.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* from: @(#)hd_timer.c 7.4 (Berkeley) 5/29/91
* $Id: hd_timer.c,v 1.2 1993/10/16 19:46:40 rgrimes Exp $
* these can be patched with adb if the
* default values are inappropriate
* This routine is called every 500ms by the kernel. Decrement timer by this
* amount - if expired then process the event.
register struct hdcb
*hdp
;
register int s
= splimp ();
for (hdp
= hdcbhead
; hdp
; hdp
= hdp
->hd_next
) {
if (hdp
->hd_rrtimer
&& (--hdp
->hd_rrtimer
== 0)) {
if (hdp
->hd_lasttxnr
!= hdp
->hd_vr
)
hd_writeinternal (hdp
, RR
, POLLOFF
);
if (!(hdp
->hd_timer
&& --hdp
->hd_timer
== 0))
hd_writeinternal (hdp
, DISC
, POLLON
);
if (hdp
->hd_lastrxnr
!= hdp
->hd_vs
) { /* XXX */
hd_writeinternal (hdp
, FRMR
, POLLOFF
);
if (++hdp
->hd_retxcnt
== hd_n2
) {
hd_writeinternal (hdp
, SABM
, POLLOFF
);
if (++hdp
->hd_retxcnt
== hd_n2
) {
/* Notify the packet level. */
(void) pk_ctlinput (PRC_LINKDOWN
, hdp
->hd_pkp
);
hdp
->hd_state
= SABM_SENT
;
hd_writeinternal (hdp
, SABM
, POLLOFF
);
hd_writeinternal (hdp
, DM
, POLLOFF
);
if (++hdp
->hd_retxcnt
== hd_n2
) {
hd_writeinternal (hdp
, DM
, POLLOFF
);
hd_writeinternal (hdp
, SABM
, POLLOFF
);
/* Do this indefinitely. */
hd_writeinternal (hdp
, SABM
, POLLON
);
* Poll the interface driver flags waiting
* for the IFF_UP bit to come on.
if (hdp
->hd_ifp
->if_flags
& IFF_UP
)