diff options
| author | phk <phk@FreeBSD.org> | 1998-02-28 21:16:13 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 1998-02-28 21:16:13 +0000 |
| commit | 8dbcc994cab6a1a84b3d5e080bd1d082efda7e6d (patch) | |
| tree | d7328c2a55a33e5976c0a4f77e59fa491689da29 /sys/i386/isa/clock.c | |
| parent | c5228af8cf2dc9f9d3c5ebb1a617edc4e6d4542c (diff) | |
| download | FreeBSD-src-8dbcc994cab6a1a84b3d5e080bd1d082efda7e6d.zip FreeBSD-src-8dbcc994cab6a1a84b3d5e080bd1d082efda7e6d.tar.gz | |
Prevent the TSC from being used on APM machines, we have no idea if
it runs at a constant frequency. This was less of an issue before,
because the TSC only interpolated in the HZ intervals, but now where
the timecounter is used all the way, this becomes much more visible.
Nit: Fix a printf which triggered the bde-filter.
Diffstat (limited to 'sys/i386/isa/clock.c')
| -rw-r--r-- | sys/i386/isa/clock.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/i386/isa/clock.c b/sys/i386/isa/clock.c index bc0b951..4388c97 100644 --- a/sys/i386/isa/clock.c +++ b/sys/i386/isa/clock.c @@ -34,7 +34,7 @@ * SUCH DAMAGE. * * from: @(#)clock.c 7.2 (Berkeley) 5/12/91 - * $Id: clock.c,v 1.112 1998/02/21 20:45:27 jkh Exp $ + * $Id: clock.c,v 1.113 1998/02/23 00:11:25 bde Exp $ */ /* @@ -49,6 +49,7 @@ */ #include "opt_clock.h" +#include "apm.h" #include <sys/param.h> #include <sys/systm.h> @@ -633,9 +634,9 @@ calibrate_clocks(void) tsc_freq = rdtsc(); if (bootverbose) { - printf("i8254 clock: %u Hz\n", tot_count); if (tsc_present) printf("TSC clock: %u Hz, ", tsc_freq); + printf("i8254 clock: %u Hz\n", tot_count); } return (tot_count); @@ -683,6 +684,9 @@ startrtclock() #ifdef SMP tsc_present = 0; #endif +#if NAPM > 0 + tsc_present = 0; +#endif writertc(RTC_STATUSA, rtc_statusa); writertc(RTC_STATUSB, RTCSB_24HR); |
