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MFi386: revision 1.606.

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This commit is contained in:
nyan 2005-02-06 13:23:20 +00:00
parent d5130a84f6
commit e740735d01
2 changed files with 20 additions and 4 deletions
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12
sys/pc98/i386/machdep.c
View File

@ -1044,6 +1044,7 @@ cpu_boot(int howto)
int
cpu_est_clockrate(int cpu_id, uint64_t *rate)
{
register_t reg;
uint64_t tsc1, tsc2;
if (pcpu_find(cpu_id) == NULL || rate == NULL)
@ -1065,9 +1066,11 @@ cpu_est_clockrate(int cpu_id, uint64_t *rate)
#endif
/* Calibrate by measuring a short delay. */
reg = intr_disable();
tsc1 = rdtsc();
DELAY(1000);
tsc2 = rdtsc();
intr_restore(reg);
#ifdef SMP
mtx_lock_spin(&sched_lock);
@ -1075,8 +1078,13 @@ cpu_est_clockrate(int cpu_id, uint64_t *rate)
mtx_unlock_spin(&sched_lock);
#endif
tsc_freq = (tsc2 - tsc1) * 1000;
*rate = tsc_freq;
/*
* Calculate the difference in readings, convert to Mhz, and
* subtract 0.5% of the total. Empirical testing has shown that
* overhead in DELAY() works out to approximately this value.
*/
tsc2 -= tsc1;
*rate = tsc2 * 1000 - tsc2 * 5;
return (0);
}

12
sys/pc98/pc98/machdep.c
View File

@ -1044,6 +1044,7 @@ cpu_boot(int howto)
int
cpu_est_clockrate(int cpu_id, uint64_t *rate)
{
register_t reg;
uint64_t tsc1, tsc2;
if (pcpu_find(cpu_id) == NULL || rate == NULL)
@ -1065,9 +1066,11 @@ cpu_est_clockrate(int cpu_id, uint64_t *rate)
#endif
/* Calibrate by measuring a short delay. */
reg = intr_disable();
tsc1 = rdtsc();
DELAY(1000);
tsc2 = rdtsc();
intr_restore(reg);
#ifdef SMP
mtx_lock_spin(&sched_lock);
@ -1075,8 +1078,13 @@ cpu_est_clockrate(int cpu_id, uint64_t *rate)
mtx_unlock_spin(&sched_lock);
#endif
tsc_freq = (tsc2 - tsc1) * 1000;
*rate = tsc_freq;
/*
* Calculate the difference in readings, convert to Mhz, and
* subtract 0.5% of the total. Empirical testing has shown that
* overhead in DELAY() works out to approximately this value.
*/
tsc2 -= tsc1;
*rate = tsc2 * 1000 - tsc2 * 5;
return (0);
}