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Reduce overhead of PPS when not active.

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Pointed out by:	bde
This commit is contained in:
Poul-Henning Kamp 1999-03-30 12:41:04 +00:00
parent fea1204c42
commit 35c08af0ad
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=45149
1 changed files with 11 additions and 9 deletions
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20
sys/i386/isa/sio.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
* $Id: sio.c,v 1.231 1999/03/25 00:32:54 steve Exp $
* $Id: sio.c,v 1.232 1999/03/30 09:02:38 phk Exp $
*/
#include "opt_comconsole.h"
@ -1593,14 +1593,15 @@ siointr1(com)
int_ctl_new = int_ctl;
while (!com->gone) {
modem_status = inb(com->modem_status_port);
if ((com->pps.ppsparam.mode & PPS_CAPTUREBOTH) &&
((modem_status ^ com->last_modem_status) & MSR_DCD)) {
tc = timecounter;
count = tc->tc_get_timecount(tc);
pps_event(&com->pps, tc, count,
(modem_status & MSR_DCD) ?
PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) {
modem_status = inb(com->modem_status_port);
if ((modem_status ^ com->last_modem_status) & MSR_DCD) {
tc = timecounter;
count = tc->tc_get_timecount(tc);
pps_event(&com->pps, tc, count,
(modem_status & MSR_DCD) ?
PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
}
}
line_status = inb(com->line_status_port);
@ -1678,6 +1679,7 @@ if (com->iptr - com->ibuf == 8)
}
/* modem status change? (always check before doing output) */
modem_status = inb(com->modem_status_port);
if (modem_status != com->last_modem_status) {
if (com->do_dcd_timestamp
&& !(com->last_modem_status & MSR_DCD)