| tsc.c (118550) | tsc.c (118987) |
|---|---|
| 1/*- 2 * Copyright (c) 1998-2003 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 12 unchanged lines hidden (view full) --- 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 1998-2003 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 12 unchanged lines hidden (view full) --- 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28#include <sys/cdefs.h> |
| 29__FBSDID("$FreeBSD: head/sys/i386/i386/tsc.c 118550 2003-08-06 15:05:27Z phk $"); | 29__FBSDID("$FreeBSD: head/sys/i386/i386/tsc.c 118987 2003-08-16 08:23:53Z phk $"); |
| 30 31#include "opt_clock.h" 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/sysctl.h> 36#include <sys/time.h> 37#include <sys/timetc.h> --- 17 unchanged lines hidden (view full) --- 55 56static unsigned tsc_get_timecount(struct timecounter *tc); 57 58static struct timecounter tsc_timecounter = { 59 tsc_get_timecount, /* get_timecount */ 60 0, /* no poll_pps */ 61 ~0u, /* counter_mask */ 62 0, /* frequency */ | 30 31#include "opt_clock.h" 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/sysctl.h> 36#include <sys/time.h> 37#include <sys/timetc.h> --- 17 unchanged lines hidden (view full) --- 55 56static unsigned tsc_get_timecount(struct timecounter *tc); 57 58static struct timecounter tsc_timecounter = { 59 tsc_get_timecount, /* get_timecount */ 60 0, /* no poll_pps */ 61 ~0u, /* counter_mask */ 62 0, /* frequency */ |
| 63 "TSC" /* name */ | 63 "TSC", /* name */ 64 800, /* quality (adjusted in code) */ |
| 64}; 65 66void 67init_TSC(void) 68{ 69 u_int64_t tscval[2]; 70 71 if (cpu_feature & CPUID_TSC) --- 9 unchanged lines hidden (view full) --- 81 82 tscval[0] = rdtsc(); 83 DELAY(1000000); 84 tscval[1] = rdtsc(); 85 86 tsc_freq = tscval[1] - tscval[0]; 87 if (bootverbose) 88 printf("TSC clock: %ju Hz\n", (intmax_t)tsc_freq); | 65}; 66 67void 68init_TSC(void) 69{ 70 u_int64_t tscval[2]; 71 72 if (cpu_feature & CPUID_TSC) --- 9 unchanged lines hidden (view full) --- 82 83 tscval[0] = rdtsc(); 84 DELAY(1000000); 85 tscval[1] = rdtsc(); 86 87 tsc_freq = tscval[1] - tscval[0]; 88 if (bootverbose) 89 printf("TSC clock: %ju Hz\n", (intmax_t)tsc_freq); |
| 89 90#ifdef SMP 91 /* 92 * We can not use the TSC in SMP mode unless the TSCs on all CPUs 93 * are somehow synchronized. Some hardware configurations do 94 * this, but we have no way of determining whether this is the 95 * case, so we do not use the TSC in multi-processor systems 96 * unless the user indicated (by setting kern.timecounter.smp_tsc 97 * to 1) that he believes that his TSCs are synchronized. 98 */ 99 if (mp_ncpus > 1 && !smp_tsc) 100 return; 101#endif 102 return; | |
| 103} 104 105 106void 107init_TSC_tc(void) 108{ 109 /* 110 * We can not use the TSC if we support APM. Precise timekeeping 111 * on an APM'ed machine is at best a fools pursuit, since 112 * any and all of the time spent in various SMM code can't 113 * be reliably accounted for. Reading the RTC is your only 114 * source of reliable time info. The i8254 looses too of course 115 * but we need to have some kind of time... 116 * We don't know at this point whether APM is going to be used 117 * or not, nor when it might be activated. Play it safe. 118 */ 119 if (power_pm_get_type() == POWER_PM_TYPE_APM) { | 90} 91 92 93void 94init_TSC_tc(void) 95{ 96 /* 97 * We can not use the TSC if we support APM. Precise timekeeping 98 * on an APM'ed machine is at best a fools pursuit, since 99 * any and all of the time spent in various SMM code can't 100 * be reliably accounted for. Reading the RTC is your only 101 * source of reliable time info. The i8254 looses too of course 102 * but we need to have some kind of time... 103 * We don't know at this point whether APM is going to be used 104 * or not, nor when it might be activated. Play it safe. 105 */ 106 if (power_pm_get_type() == POWER_PM_TYPE_APM) { |
| 107 tsc_timecounter.tc_quality = -1000; |
|
| 120 if (bootverbose) 121 printf("TSC timecounter disabled: APM enabled.\n"); | 108 if (bootverbose) 109 printf("TSC timecounter disabled: APM enabled.\n"); |
| 122 return; | |
| 123 } 124 | 110 } 111 |
| 112#ifdef SMP 113 /* 114 * We can not use the TSC in SMP mode unless the TSCs on all CPUs 115 * are somehow synchronized. Some hardware configurations do 116 * this, but we have no way of determining whether this is the 117 * case, so we do not use the TSC in multi-processor systems 118 * unless the user indicated (by setting kern.timecounter.smp_tsc 119 * to 1) that he believes that his TSCs are synchronized. 120 */ 121 if (mp_ncpus > 1 && !smp_tsc) 122 tsc_timecounter.tc_quality = -100; 123#endif 124 |
|
| 125 if (tsc_present && tsc_freq != 0 && !tsc_is_broken) { 126 tsc_timecounter.tc_frequency = tsc_freq; 127 tc_init(&tsc_timecounter); 128 } | 125 if (tsc_present && tsc_freq != 0 && !tsc_is_broken) { 126 tsc_timecounter.tc_frequency = tsc_freq; 127 tc_init(&tsc_timecounter); 128 } |
| 129 130 return; | |
| 131} 132 133static int 134sysctl_machdep_tsc_freq(SYSCTL_HANDLER_ARGS) 135{ 136 int error; 137 uint64_t freq; 138 --- 19 unchanged lines hidden --- | 129} 130 131static int 132sysctl_machdep_tsc_freq(SYSCTL_HANDLER_ARGS) 133{ 134 int error; 135 uint64_t freq; 136 --- 19 unchanged lines hidden --- |