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Differential D14433 Diff 39522 head/sys/powerpc/powerpc/clock.c

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head/sys/powerpc/powerpc/clock.c

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#include <machine/intr_machdep.h> #include <machine/intr_machdep.h>
#include <machine/md_var.h> #include <machine/md_var.h>
#include <machine/smp.h> #include <machine/smp.h>
/* /*
* Initially we assume a processor with a bus frequency of 12.5 MHz. * Initially we assume a processor with a bus frequency of 12.5 MHz.
*/ */
static int initialized = 0; static int initialized = 0;
static u_long ns_per_tick = 80; static uint64_t ps_per_tick = 80000;
static u_long ticks_per_sec = 12500000; static u_long ticks_per_sec = 12500000;
static u_long *decr_counts[MAXCPU]; static u_long *decr_counts[MAXCPU];
static int decr_et_start(struct eventtimer *et, static int decr_et_start(struct eventtimer *et,
sbintime_t first, sbintime_t period); sbintime_t first, sbintime_t period);
static int decr_et_stop(struct eventtimer *et); static int decr_et_stop(struct eventtimer *et);
static timecounter_get_t decr_get_timecount; static timecounter_get_t decr_get_timecount;
▲ Show 20 Lines • Show All 79 Lines • ▼ Show 20 Linesdecr_init(void)
/* /*
* Check the BSP's timebase frequency. Sometimes we can't find the BSP, * Check the BSP's timebase frequency. Sometimes we can't find the BSP,
* so fall back to the first CPU in this case. * so fall back to the first CPU in this case.
*/ */
if (platform_smp_get_bsp(&cpu) != 0) if (platform_smp_get_bsp(&cpu) != 0)
platform_smp_first_cpu(&cpu); platform_smp_first_cpu(&cpu);
ticks_per_sec = platform_timebase_freq(&cpu); ticks_per_sec = platform_timebase_freq(&cpu);
ns_per_tick = 1000000000 / ticks_per_sec; ps_per_tick = 1000000000000 / ticks_per_sec;
set_cputicker(mftb, ticks_per_sec, 0); set_cputicker(mftb, ticks_per_sec, 0);
snprintf(buf, sizeof(buf), "cpu%d:decrementer", curcpu); snprintf(buf, sizeof(buf), "cpu%d:decrementer", curcpu);
intrcnt_add(buf, &decr_counts[curcpu]); intrcnt_add(buf, &decr_counts[curcpu]);
decr_et_stop(NULL); decr_et_stop(NULL);
initialized = 1; initialized = 1;
} }
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*/ */
void void
DELAY(int n) DELAY(int n)
{ {
u_quad_t tb, ttb; u_quad_t tb, ttb;
TSENTER(); TSENTER();
tb = mftb(); tb = mftb();
ttb = tb + howmany(n * 1000, ns_per_tick); ttb = tb + howmany((uint64_t)n * 1000000, ps_per_tick);
while (tb < ttb) while (tb < ttb)
tb = mftb(); tb = mftb();
TSEXIT(); TSEXIT();
} }