diff options
| author | phk <phk@FreeBSD.org> | 1999-03-30 12:41:04 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 1999-03-30 12:41:04 +0000 |
| commit | 825610c790bfa8efb7520bdccdefc90006f7328e (patch) | |
| tree | 2a2f930c08cfeed7b96d9bb66657d47248ef1211 /sys | |
| parent | e1e84c931ff0717a4133611c4beff26561870315 (diff) | |
| download | FreeBSD-src-825610c790bfa8efb7520bdccdefc90006f7328e.zip FreeBSD-src-825610c790bfa8efb7520bdccdefc90006f7328e.tar.gz | |
Reduce overhead of PPS when not active.
Pointed out by: bde
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/i386/isa/sio.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/sys/i386/isa/sio.c b/sys/i386/isa/sio.c index b12ef71..84bd356 100644 --- a/sys/i386/isa/sio.c +++ b/sys/i386/isa/sio.c @@ -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 @@ cont: } /* 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) |
