/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
* real-time clock.
*/
-#include <libkern/OSTypes.h>
-
#include <mach/mach_types.h>
#include <kern/clock.h>
#include <kern/thread.h>
+#include <kern/processor.h>
#include <kern/macro_help.h>
#include <kern/spl.h>
+#include <kern/pms.h>
-#include <machine/mach_param.h> /* HZ */
+#include <machine/commpage.h>
+#include <machine/machine_routines.h>
+#include <ppc/exception.h>
#include <ppc/proc_reg.h>
-
-#include <pexpert/pexpert.h>
+#include <ppc/rtclock.h>
#include <sys/kdebug.h>
-int sysclk_config(void);
-
-int sysclk_init(void);
-
-kern_return_t sysclk_gettime(
- mach_timespec_t *cur_time);
-
-kern_return_t sysclk_getattr(
- clock_flavor_t flavor,
- clock_attr_t attr,
- mach_msg_type_number_t *count);
-
-void sysclk_setalarm(
- mach_timespec_t *deadline);
-
-struct clock_ops sysclk_ops = {
- sysclk_config, sysclk_init,
- sysclk_gettime, 0,
- sysclk_getattr, 0,
- sysclk_setalarm,
-};
-
-int calend_config(void);
-
-int calend_init(void);
-
-kern_return_t calend_gettime(
- mach_timespec_t *cur_time);
-
-kern_return_t calend_settime(
- mach_timespec_t *cur_time);
-
-kern_return_t calend_getattr(
- clock_flavor_t flavor,
- clock_attr_t attr,
- mach_msg_type_number_t *count);
-
-struct clock_ops calend_ops = {
- calend_config, calend_init,
- calend_gettime, calend_settime,
- calend_getattr, 0,
- 0,
-};
-
-/* local data declarations */
-
-static struct rtclock {
- mach_timespec_t calend_offset;
- boolean_t calend_is_set;
-
- mach_timebase_info_data_t timebase_const;
-
- struct rtclock_timer {
- uint64_t deadline;
- boolean_t is_set;
- } timer[NCPUS];
-
- clock_timer_func_t timer_expire;
+int rtclock_config(void);
- timer_call_data_t alarm[NCPUS];
+int rtclock_init(void);
- /* debugging */
- uint64_t last_abstime[NCPUS];
- int last_decr[NCPUS];
+#define NSEC_PER_HZ (NSEC_PER_SEC / 100)
- decl_simple_lock_data(,lock) /* real-time clock device lock */
-} rtclock;
+static uint32_t rtclock_sec_divisor;
-static boolean_t rtclock_initialized;
+static mach_timebase_info_data_t rtclock_timebase_const;
-static uint64_t rtclock_tick_deadline[NCPUS];
-static uint64_t rtclock_tick_interval;
+static boolean_t rtclock_timebase_initialized;
-static void timespec_to_absolutetime(
- mach_timespec_t timespec,
- uint64_t *result);
+/* XXX this should really be in a header somewhere */
+extern clock_timer_func_t rtclock_timer_expire;
-static int deadline_to_decrementer(
- uint64_t deadline,
- uint64_t now);
-
-static void rtclock_alarm_timer(
- timer_call_param_t p0,
- timer_call_param_t p1);
-
-/* global data declarations */
-
-#define RTC_TICKPERIOD (NSEC_PER_SEC / HZ)
-
-#define DECREMENTER_MAX 0x7FFFFFFFUL
-#define DECREMENTER_MIN 0xAUL
-
-natural_t rtclock_decrementer_min;
+decl_simple_lock_data(static,rtclock_lock)
/*
* Macros to lock/unlock real-time clock device.
#define LOCK_RTC(s) \
MACRO_BEGIN \
(s) = splclock(); \
- simple_lock(&rtclock.lock); \
+ simple_lock(&rtclock_lock); \
MACRO_END
#define UNLOCK_RTC(s) \
MACRO_BEGIN \
- simple_unlock(&rtclock.lock); \
+ simple_unlock(&rtclock_lock); \
splx(s); \
MACRO_END
timebase_callback(
struct timebase_freq_t *freq)
{
- natural_t numer, denom;
- int n;
+ uint32_t numer, denom;
spl_t s;
- denom = freq->timebase_num;
- n = 9;
- while (!(denom % 10)) {
- if (n < 1)
- break;
- denom /= 10;
- n--;
- }
+ if ( freq->timebase_den < 1 || freq->timebase_den > 4 ||
+ freq->timebase_num < freq->timebase_den )
+ panic("rtclock timebase_callback: invalid constant %lu / %lu",
+ freq->timebase_num, freq->timebase_den);
- numer = freq->timebase_den;
- while (n-- > 0) {
- numer *= 10;
- }
+ denom = freq->timebase_num;
+ numer = freq->timebase_den * NSEC_PER_SEC;
LOCK_RTC(s);
- rtclock.timebase_const.numer = numer;
- rtclock.timebase_const.denom = denom;
- UNLOCK_RTC(s);
-}
-
-/*
- * Configure the real-time clock device.
- */
-int
-sysclk_config(void)
-{
- int i;
-
- if (cpu_number() != master_cpu)
- return(1);
-
- for (i = 0; i < NCPUS; i++)
- timer_call_setup(&rtclock.alarm[i], rtclock_alarm_timer, NULL);
-
- simple_lock_init(&rtclock.lock, ETAP_MISC_RT_CLOCK);
-
- PE_register_timebase_callback(timebase_callback);
-
- return (1);
-}
-
-/*
- * Initialize the system clock device.
- */
-int
-sysclk_init(void)
-{
- uint64_t abstime;
- int decr, mycpu = cpu_number();
-
- if (mycpu != master_cpu) {
- if (rtclock_initialized == FALSE) {
- panic("sysclk_init on cpu %d, rtc not initialized\n", mycpu);
- }
- /* Set decrementer and hence our next tick due */
- clock_get_uptime(&abstime);
- rtclock_tick_deadline[mycpu] = abstime;
- rtclock_tick_deadline[mycpu] += rtclock_tick_interval;
- decr = deadline_to_decrementer(rtclock_tick_deadline[mycpu], abstime);
- mtdec(decr);
- rtclock.last_decr[mycpu] = decr;
-
- return(1);
- }
-
- /*
- * Initialize non-zero clock structure values.
- */
- clock_interval_to_absolutetime_interval(RTC_TICKPERIOD, 1,
- &rtclock_tick_interval);
- /* Set decrementer and our next tick due */
- clock_get_uptime(&abstime);
- rtclock_tick_deadline[mycpu] = abstime;
- rtclock_tick_deadline[mycpu] += rtclock_tick_interval;
- decr = deadline_to_decrementer(rtclock_tick_deadline[mycpu], abstime);
- mtdec(decr);
- rtclock.last_decr[mycpu] = decr;
-
- rtclock_initialized = TRUE;
-
- return (1);
-}
-
-#define UnsignedWide_to_scalar(x) (*(uint64_t *)(x))
-#define scalar_to_UnsignedWide(x) (*(UnsignedWide *)(x))
-
-/*
- * Perform a full 64 bit by 32 bit unsigned multiply,
- * yielding a 96 bit product. The most significant
- * portion of the product is returned as a 64 bit
- * quantity, with the lower portion as a 32 bit word.
- */
-static void
-umul_64by32(
- UnsignedWide now64,
- uint32_t mult32,
- UnsignedWide *result64,
- uint32_t *result32)
-{
- uint32_t mid, mid2;
-
- asm volatile(" mullw %0,%1,%2" :
- "=r" (*result32) :
- "r" (now64.lo), "r" (mult32));
-
- asm volatile(" mullw %0,%1,%2" :
- "=r" (mid2) :
- "r" (now64.hi), "r" (mult32));
- asm volatile(" mulhwu %0,%1,%2" :
- "=r" (mid) :
- "r" (now64.lo), "r" (mult32));
-
- asm volatile(" mulhwu %0,%1,%2" :
- "=r" (result64->hi) :
- "r" (now64.hi), "r" (mult32));
-
- asm volatile(" addc %0,%2,%3;
- addze %1,%4" :
- "=r" (result64->lo), "=r" (result64->hi) :
- "r" (mid), "r" (mid2), "1" (result64->hi));
-}
-
-/*
- * Perform a partial 64 bit by 32 bit unsigned multiply,
- * yielding a 64 bit product. Only the least significant
- * 64 bits of the product are calculated and returned.
- */
-static void
-umul_64by32to64(
- UnsignedWide now64,
- uint32_t mult32,
- UnsignedWide *result64)
-{
- uint32_t mid, mid2;
-
- asm volatile(" mullw %0,%1,%2" :
- "=r" (result64->lo) :
- "r" (now64.lo), "r" (mult32));
-
- asm volatile(" mullw %0,%1,%2" :
- "=r" (mid2) :
- "r" (now64.hi), "r" (mult32));
- asm volatile(" mulhwu %0,%1,%2" :
- "=r" (mid) :
- "r" (now64.lo), "r" (mult32));
-
- asm volatile(" add %0,%1,%2" :
- "=r" (result64->hi) :
- "r" (mid), "r" (mid2));
-}
-
-/*
- * Perform an unsigned division of a 96 bit value
- * by a 32 bit value, yielding a 96 bit quotient.
- * The most significant portion of the product is
- * returned as a 64 bit quantity, with the lower
- * portion as a 32 bit word.
- */
-static void
-udiv_96by32(
- UnsignedWide now64,
- uint32_t now32,
- uint32_t div32,
- UnsignedWide *result64,
- uint32_t *result32)
-{
- UnsignedWide t64;
-
- if (now64.hi > 0 || now64.lo >= div32) {
- UnsignedWide_to_scalar(result64) =
- UnsignedWide_to_scalar(&now64) / div32;
+ if (!rtclock_timebase_initialized) {
+ commpage_set_timestamp(0,0,0);
- umul_64by32to64(*result64, div32, &t64);
+ rtclock_timebase_const.numer = numer;
+ rtclock_timebase_const.denom = denom;
+ rtclock_sec_divisor = freq->timebase_num / freq->timebase_den;
- UnsignedWide_to_scalar(&t64) =
- UnsignedWide_to_scalar(&now64) - UnsignedWide_to_scalar(&t64);
-
- *result32 = (((uint64_t)t64.lo << 32) | now32) / div32;
+ ml_init_lock_timeout();
}
else {
- UnsignedWide_to_scalar(result64) =
- (((uint64_t)now64.lo << 32) | now32) / div32;
-
- *result32 = result64->lo;
- result64->lo = result64->hi;
- result64->hi = 0;
- }
-}
-
-/*
- * Perform an unsigned division of a 96 bit value
- * by a 32 bit value, yielding a 64 bit quotient.
- * Any higher order bits of the quotient are simply
- * discarded.
- */
-static void
-udiv_96by32to64(
- UnsignedWide now64,
- uint32_t now32,
- uint32_t div32,
- UnsignedWide *result64)
-{
- UnsignedWide t64;
-
- if (now64.hi > 0 || now64.lo >= div32) {
- UnsignedWide_to_scalar(result64) =
- UnsignedWide_to_scalar(&now64) / div32;
-
- umul_64by32to64(*result64, div32, &t64);
-
- UnsignedWide_to_scalar(&t64) =
- UnsignedWide_to_scalar(&now64) - UnsignedWide_to_scalar(&t64);
-
- result64->hi = result64->lo;
- result64->lo = (((uint64_t)t64.lo << 32) | now32) / div32;
- }
- else {
- UnsignedWide_to_scalar(result64) =
- (((uint64_t)now64.lo << 32) | now32) / div32;
- }
-}
-
-/*
- * Perform an unsigned division of a 96 bit value
- * by a 32 bit value, yielding a 32 bit quotient,
- * and a 32 bit remainder. Any higher order bits
- * of the quotient are simply discarded.
- */
-static void
-udiv_96by32to32and32(
- UnsignedWide now64,
- uint32_t now32,
- uint32_t div32,
- uint32_t *result32,
- uint32_t *remain32)
-{
- UnsignedWide t64, u64;
-
- if (now64.hi > 0 || now64.lo >= div32) {
- UnsignedWide_to_scalar(&t64) =
- UnsignedWide_to_scalar(&now64) / div32;
-
- umul_64by32to64(t64, div32, &t64);
-
- UnsignedWide_to_scalar(&t64) =
- UnsignedWide_to_scalar(&now64) - UnsignedWide_to_scalar(&t64);
-
- UnsignedWide_to_scalar(&t64) = ((uint64_t)t64.lo << 32) | now32;
-
- UnsignedWide_to_scalar(&u64) =
- UnsignedWide_to_scalar(&t64) / div32;
-
- *result32 = u64.lo;
-
- umul_64by32to64(u64, div32, &u64);
-
- *remain32 = UnsignedWide_to_scalar(&t64) -
- UnsignedWide_to_scalar(&u64);
- }
- else {
- UnsignedWide_to_scalar(&t64) = ((uint64_t)now64.lo << 32) | now32;
-
- UnsignedWide_to_scalar(&u64) =
- UnsignedWide_to_scalar(&t64) / div32;
-
- *result32 = u64.lo;
-
- umul_64by32to64(u64, div32, &u64);
-
- *remain32 = UnsignedWide_to_scalar(&t64) -
- UnsignedWide_to_scalar(&u64);
+ UNLOCK_RTC(s);
+ printf("rtclock timebase_callback: late old %d / %d new %d / %d\n",
+ rtclock_timebase_const.numer, rtclock_timebase_const.denom,
+ numer, denom);
+ return;
}
-}
-
-/*
- * Get the clock device time. This routine is responsible
- * for converting the device's machine dependent time value
- * into a canonical mach_timespec_t value.
- *
- * SMP configurations - *the processor clocks are synchronised*
- */
-kern_return_t
-sysclk_gettime_internal(
- mach_timespec_t *time) /* OUT */
-{
- UnsignedWide now;
- UnsignedWide t64;
- uint32_t t32;
- uint32_t numer, denom;
-
- numer = rtclock.timebase_const.numer;
- denom = rtclock.timebase_const.denom;
-
- clock_get_uptime((uint64_t *)&now);
-
- umul_64by32(now, numer, &t64, &t32);
-
- udiv_96by32(t64, t32, denom, &t64, &t32);
-
- udiv_96by32to32and32(t64, t32, NSEC_PER_SEC,
- &time->tv_sec, &time->tv_nsec);
-
- return (KERN_SUCCESS);
-}
-
-kern_return_t
-sysclk_gettime(
- mach_timespec_t *time) /* OUT */
-{
- UnsignedWide now;
- UnsignedWide t64;
- uint32_t t32;
- uint32_t numer, denom;
- spl_t s;
-
- LOCK_RTC(s);
- numer = rtclock.timebase_const.numer;
- denom = rtclock.timebase_const.denom;
UNLOCK_RTC(s);
- clock_get_uptime((uint64_t *)&now);
-
- umul_64by32(now, numer, &t64, &t32);
-
- udiv_96by32(t64, t32, denom, &t64, &t32);
-
- udiv_96by32to32and32(t64, t32, NSEC_PER_SEC,
- &time->tv_sec, &time->tv_nsec);
-
- return (KERN_SUCCESS);
-}
-
-/*
- * Get clock device attributes.
- */
-kern_return_t
-sysclk_getattr(
- clock_flavor_t flavor,
- clock_attr_t attr, /* OUT */
- mach_msg_type_number_t *count) /* IN/OUT */
-{
- spl_t s;
-
- if (*count != 1)
- return (KERN_FAILURE);
- switch (flavor) {
-
- case CLOCK_GET_TIME_RES: /* >0 res */
- case CLOCK_ALARM_CURRES: /* =0 no alarm */
- case CLOCK_ALARM_MINRES:
- case CLOCK_ALARM_MAXRES:
- LOCK_RTC(s);
- *(clock_res_t *) attr = RTC_TICKPERIOD;
- UNLOCK_RTC(s);
- break;
-
- default:
- return (KERN_INVALID_VALUE);
- }
- return (KERN_SUCCESS);
+ clock_timebase_init();
}
/*
- * Set deadline for the next alarm on the clock device. This call
- * always resets the time to deliver an alarm for the clock.
+ * Configure the system clock device.
*/
-void
-sysclk_setalarm(
- mach_timespec_t *deadline)
+int
+rtclock_config(void)
{
- uint64_t abstime;
+ simple_lock_init(&rtclock_lock, 0);
- timespec_to_absolutetime(*deadline, &abstime);
- timer_call_enter(&rtclock.alarm[cpu_number()], abstime);
-}
+ PE_register_timebase_callback(timebase_callback);
-/*
- * Configure the calendar clock.
- */
-int
-calend_config(void)
-{
return (1);
}
/*
- * Initialize the calendar clock.
+ * Initialize the system clock device.
*/
int
-calend_init(void)
+rtclock_init(void)
{
- if (cpu_number() != master_cpu)
- return(1);
+ etimer_resync_deadlines(); /* Start the timers going */
return (1);
}
-/*
- * Get the current clock time.
- */
-kern_return_t
-calend_gettime(
- mach_timespec_t *curr_time) /* OUT */
+void
+clock_get_system_microtime(
+ uint32_t *secs,
+ uint32_t *microsecs)
{
- spl_t s;
+ uint64_t now, t64;
+ uint32_t divisor;
- LOCK_RTC(s);
- if (!rtclock.calend_is_set) {
- UNLOCK_RTC(s);
- return (KERN_FAILURE);
- }
+ now = mach_absolute_time();
- (void) sysclk_gettime_internal(curr_time);
- ADD_MACH_TIMESPEC(curr_time, &rtclock.calend_offset);
- UNLOCK_RTC(s);
-
- return (KERN_SUCCESS);
+ *secs = t64 = now / (divisor = rtclock_sec_divisor);
+ now -= (t64 * divisor);
+ *microsecs = (now * USEC_PER_SEC) / divisor;
}
-/*
- * Set the current clock time.
- */
-kern_return_t
-calend_settime(
- mach_timespec_t *new_time)
-{
- mach_timespec_t curr_time;
- spl_t s;
-
- LOCK_RTC(s);
- (void) sysclk_gettime_internal(&curr_time);
- rtclock.calend_offset = *new_time;
- SUB_MACH_TIMESPEC(&rtclock.calend_offset, &curr_time);
- rtclock.calend_is_set = TRUE;
- UNLOCK_RTC(s);
-
- PESetGMTTimeOfDay(new_time->tv_sec);
-
- return (KERN_SUCCESS);
-}
-
-/*
- * Get clock device attributes.
- */
-kern_return_t
-calend_getattr(
- clock_flavor_t flavor,
- clock_attr_t attr, /* OUT */
- mach_msg_type_number_t *count) /* IN/OUT */
+void
+clock_get_system_nanotime(
+ uint32_t *secs,
+ uint32_t *nanosecs)
{
- spl_t s;
-
- if (*count != 1)
- return (KERN_FAILURE);
- switch (flavor) {
-
- case CLOCK_GET_TIME_RES: /* >0 res */
- LOCK_RTC(s);
- *(clock_res_t *) attr = RTC_TICKPERIOD;
- UNLOCK_RTC(s);
- break;
+ uint64_t now, t64;
+ uint32_t divisor;
- case CLOCK_ALARM_CURRES: /* =0 no alarm */
- case CLOCK_ALARM_MINRES:
- case CLOCK_ALARM_MAXRES:
- *(clock_res_t *) attr = 0;
- break;
+ now = mach_absolute_time();
- default:
- return (KERN_INVALID_VALUE);
- }
- return (KERN_SUCCESS);
+ *secs = t64 = now / (divisor = rtclock_sec_divisor);
+ now -= (t64 * divisor);
+ *nanosecs = (now * NSEC_PER_SEC) / divisor;
}
void
-clock_adjust_calendar(
- clock_res_t nsec)
+clock_gettimeofday_set_commpage(
+ uint64_t abstime,
+ uint64_t epoch,
+ uint64_t offset,
+ uint32_t *secs,
+ uint32_t *microsecs)
{
- spl_t s;
+ uint64_t t64, now = abstime;
- LOCK_RTC(s);
- if (rtclock.calend_is_set)
- ADD_MACH_TIMESPEC_NSEC(&rtclock.calend_offset, nsec);
- UNLOCK_RTC(s);
-}
+ simple_lock(&rtclock_lock);
-void
-clock_initialize_calendar(void)
-{
- mach_timespec_t curr_time;
- long seconds = PEGetGMTTimeOfDay();
- spl_t s;
+ now += offset;
- LOCK_RTC(s);
- (void) sysclk_gettime_internal(&curr_time);
- if (curr_time.tv_nsec < 500*USEC_PER_SEC)
- rtclock.calend_offset.tv_sec = seconds;
- else
- rtclock.calend_offset.tv_sec = seconds + 1;
- rtclock.calend_offset.tv_nsec = 0;
- SUB_MACH_TIMESPEC(&rtclock.calend_offset, &curr_time);
- rtclock.calend_is_set = TRUE;
- UNLOCK_RTC(s);
-}
+ *secs = t64 = now / rtclock_sec_divisor;
+ now -= (t64 * rtclock_sec_divisor);
+ *microsecs = (now * USEC_PER_SEC) / rtclock_sec_divisor;
-mach_timespec_t
-clock_get_calendar_offset(void)
-{
- mach_timespec_t result = MACH_TIMESPEC_ZERO;
- spl_t s;
+ *secs += epoch;
- LOCK_RTC(s);
- if (rtclock.calend_is_set)
- result = rtclock.calend_offset;
- UNLOCK_RTC(s);
+ commpage_set_timestamp(abstime - now, *secs, rtclock_sec_divisor);
- return (result);
+ simple_unlock(&rtclock_lock);
}
void
clock_timebase_info(
mach_timebase_info_t info)
{
- spl_t s;
+ spl_t s;
LOCK_RTC(s);
- *info = rtclock.timebase_const;
+ *info = rtclock_timebase_const;
+ rtclock_timebase_initialized = TRUE;
UNLOCK_RTC(s);
}
-void
-clock_set_timer_deadline(
- uint64_t deadline)
-{
- uint64_t abstime;
- int decr, mycpu;
- struct rtclock_timer *mytimer;
- spl_t s;
-
- s = splclock();
- mycpu = cpu_number();
- mytimer = &rtclock.timer[mycpu];
- clock_get_uptime(&abstime);
- rtclock.last_abstime[mycpu] = abstime;
- mytimer->deadline = deadline;
- mytimer->is_set = TRUE;
- if ( mytimer->deadline < rtclock_tick_deadline[mycpu] ) {
- decr = deadline_to_decrementer(mytimer->deadline, abstime);
- if ( rtclock_decrementer_min != 0 &&
- rtclock_decrementer_min < (natural_t)decr )
- decr = rtclock_decrementer_min;
-
- mtdec(decr);
- rtclock.last_decr[mycpu] = decr;
-
- KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_EXCP_DECI, 1)
- | DBG_FUNC_NONE, decr, 2, 0, 0, 0);
- }
- splx(s);
-}
-
void
clock_set_timer_func(
clock_timer_func_t func)
spl_t s;
LOCK_RTC(s);
- if (rtclock.timer_expire == NULL)
- rtclock.timer_expire = func;
+ if (rtclock_timer_expire == NULL)
+ rtclock_timer_expire = func;
UNLOCK_RTC(s);
}
-/*
- * Reset the clock device. This causes the realtime clock
- * device to reload its mode and count value (frequency).
- */
-void
-rtclock_reset(void)
-{
- return;
-}
-
-/*
- * Real-time clock device interrupt.
- */
void
-rtclock_intr(
- int device,
- struct ppc_saved_state *ssp,
- spl_t old_spl)
-{
- uint64_t abstime;
- int decr[3], mycpu = cpu_number();
- struct rtclock_timer *mytimer = &rtclock.timer[mycpu];
-
- /*
- * We may receive interrupts too early, we must reject them.
- */
- if (rtclock_initialized == FALSE) {
- mtdec(DECREMENTER_MAX); /* Max the decrementer if not init */
- return;
- }
-
- decr[1] = decr[2] = DECREMENTER_MAX;
-
- clock_get_uptime(&abstime);
- rtclock.last_abstime[mycpu] = abstime;
- if ( rtclock_tick_deadline[mycpu] <= abstime ) {
- clock_deadline_for_periodic_event(rtclock_tick_interval, abstime,
- &rtclock_tick_deadline[mycpu]);
- hertz_tick(USER_MODE(ssp->srr1), ssp->srr0);
- }
-
- clock_get_uptime(&abstime);
- rtclock.last_abstime[mycpu] = abstime;
- if ( mytimer->is_set &&
- mytimer->deadline <= abstime ) {
- mytimer->is_set = FALSE;
- (*rtclock.timer_expire)(abstime);
- }
-
- clock_get_uptime(&abstime);
- rtclock.last_abstime[mycpu] = abstime;
- decr[1] = deadline_to_decrementer(rtclock_tick_deadline[mycpu], abstime);
-
- if (mytimer->is_set)
- decr[2] = deadline_to_decrementer(mytimer->deadline, abstime);
-
- if (decr[1] > decr[2])
- decr[1] = decr[2];
-
- if ( rtclock_decrementer_min != 0 &&
- rtclock_decrementer_min < (natural_t)decr[1] )
- decr[1] = rtclock_decrementer_min;
-
- mtdec(decr[1]);
- rtclock.last_decr[mycpu] = decr[1];
-
- KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_EXCP_DECI, 1)
- | DBG_FUNC_NONE, decr[1], 3, 0, 0, 0);
-}
-
-static void
-rtclock_alarm_timer(
- timer_call_param_t p0,
- timer_call_param_t p1)
-{
- mach_timespec_t timestamp;
-
- (void) sysclk_gettime(×tamp);
-
- clock_alarm_intr(SYSTEM_CLOCK, ×tamp);
-}
-
-void
-clock_get_uptime(
- uint64_t *result0)
-{
- UnsignedWide *result = (UnsignedWide *)result0;
- uint32_t hi, lo, hic;
-
- do {
- asm volatile(" mftbu %0" : "=r" (hi));
- asm volatile(" mftb %0" : "=r" (lo));
- asm volatile(" mftbu %0" : "=r" (hic));
- } while (hic != hi);
-
- result->lo = lo;
- result->hi = hi;
-}
-
-static int
-deadline_to_decrementer(
- uint64_t deadline,
- uint64_t now)
-{
- uint64_t delt;
-
- if (deadline <= now)
- return DECREMENTER_MIN;
- else {
- delt = deadline - now;
- return (delt >= (DECREMENTER_MAX + 1))? DECREMENTER_MAX:
- ((delt >= (DECREMENTER_MIN + 1))? (delt - 1): DECREMENTER_MIN);
- }
-}
-
-static void
-timespec_to_absolutetime(
- mach_timespec_t timespec,
- uint64_t *result0)
-{
- UnsignedWide *result = (UnsignedWide *)result0;
- UnsignedWide t64;
- uint32_t t32;
- uint32_t numer, denom;
- spl_t s;
-
- LOCK_RTC(s);
- numer = rtclock.timebase_const.numer;
- denom = rtclock.timebase_const.denom;
- UNLOCK_RTC(s);
-
- asm volatile(" mullw %0,%1,%2" :
- "=r" (t64.lo) :
- "r" (timespec.tv_sec), "r" (NSEC_PER_SEC));
-
- asm volatile(" mulhwu %0,%1,%2" :
- "=r" (t64.hi) :
- "r" (timespec.tv_sec), "r" (NSEC_PER_SEC));
-
- UnsignedWide_to_scalar(&t64) += timespec.tv_nsec;
-
- umul_64by32(t64, denom, &t64, &t32);
-
- udiv_96by32(t64, t32, numer, &t64, &t32);
-
- result->hi = t64.lo;
- result->lo = t32;
-}
-
-void
-clock_interval_to_deadline(
+clock_interval_to_absolutetime_interval(
uint32_t interval,
uint32_t scale_factor,
uint64_t *result)
{
- uint64_t abstime;
-
- clock_get_uptime(result);
-
- clock_interval_to_absolutetime_interval(interval, scale_factor, &abstime);
+ uint64_t nanosecs = (uint64_t)interval * scale_factor;
+ uint64_t t64;
+ uint32_t divisor;
- *result += abstime;
+ *result = (t64 = nanosecs / NSEC_PER_SEC) *
+ (divisor = rtclock_sec_divisor);
+ nanosecs -= (t64 * NSEC_PER_SEC);
+ *result += (nanosecs * divisor) / NSEC_PER_SEC;
}
void
-clock_interval_to_absolutetime_interval(
- uint32_t interval,
- uint32_t scale_factor,
- uint64_t *result0)
+absolutetime_to_microtime(
+ uint64_t abstime,
+ uint32_t *secs,
+ uint32_t *microsecs)
{
- UnsignedWide *result = (UnsignedWide *)result0;
- UnsignedWide t64;
- uint32_t t32;
- uint32_t numer, denom;
- spl_t s;
-
- LOCK_RTC(s);
- numer = rtclock.timebase_const.numer;
- denom = rtclock.timebase_const.denom;
- UNLOCK_RTC(s);
-
- asm volatile(" mullw %0,%1,%2" :
- "=r" (t64.lo) :
- "r" (interval), "r" (scale_factor));
- asm volatile(" mulhwu %0,%1,%2" :
- "=r" (t64.hi) :
- "r" (interval), "r" (scale_factor));
-
- umul_64by32(t64, denom, &t64, &t32);
+ uint64_t t64;
+ uint32_t divisor;
- udiv_96by32(t64, t32, numer, &t64, &t32);
-
- result->hi = t64.lo;
- result->lo = t32;
+ *secs = t64 = abstime / (divisor = rtclock_sec_divisor);
+ abstime -= (t64 * divisor);
+ *microsecs = (abstime * USEC_PER_SEC) / divisor;
}
void
-clock_absolutetime_interval_to_deadline(
+absolutetime_to_nanotime(
uint64_t abstime,
- uint64_t *result)
+ uint32_t *secs,
+ uint32_t *nanosecs)
{
- clock_get_uptime(result);
+ uint64_t t64;
+ uint32_t divisor;
- *result += abstime;
+ *secs = t64 = abstime / (divisor = rtclock_sec_divisor);
+ abstime -= (t64 * divisor);
+ *nanosecs = (abstime * NSEC_PER_SEC) / divisor;
}
void
-absolutetime_to_nanoseconds(
- uint64_t abstime,
+nanotime_to_absolutetime(
+ uint32_t secs,
+ uint32_t nanosecs,
uint64_t *result)
{
- UnsignedWide t64;
- uint32_t t32;
- uint32_t numer, denom;
- spl_t s;
-
- LOCK_RTC(s);
- numer = rtclock.timebase_const.numer;
- denom = rtclock.timebase_const.denom;
- UNLOCK_RTC(s);
-
- UnsignedWide_to_scalar(&t64) = abstime;
-
- umul_64by32(t64, numer, &t64, &t32);
+ uint32_t divisor = rtclock_sec_divisor;
- udiv_96by32to64(t64, t32, denom, (void *)result);
+ *result = ((uint64_t)secs * divisor) +
+ ((uint64_t)nanosecs * divisor) / NSEC_PER_SEC;
}
void
-nanoseconds_to_absolutetime(
- uint64_t nanoseconds,
+absolutetime_to_nanoseconds(
+ uint64_t abstime,
uint64_t *result)
{
- UnsignedWide t64;
- uint32_t t32;
- uint32_t numer, denom;
- spl_t s;
+ uint64_t t64;
+ uint32_t divisor;
- LOCK_RTC(s);
- numer = rtclock.timebase_const.numer;
- denom = rtclock.timebase_const.denom;
- UNLOCK_RTC(s);
-
- UnsignedWide_to_scalar(&t64) = nanoseconds;
-
- umul_64by32(t64, denom, &t64, &t32);
-
- udiv_96by32to64(t64, t32, numer, (void *)result);
+ *result = (t64 = abstime / (divisor = rtclock_sec_divisor)) * NSEC_PER_SEC;
+ abstime -= (t64 * divisor);
+ *result += (abstime * NSEC_PER_SEC) / divisor;
}
-/*
- * Spin-loop delay primitives.
- */
void
-delay_for_interval(
- uint32_t interval,
- uint32_t scale_factor)
+nanoseconds_to_absolutetime(
+ uint64_t nanosecs,
+ uint64_t *result)
{
- uint64_t now, end;
+ uint64_t t64;
+ uint32_t divisor;
- clock_interval_to_deadline(interval, scale_factor, &end);
-
- do {
- clock_get_uptime(&now);
- } while (now < end);
+ *result = (t64 = nanosecs / NSEC_PER_SEC) *
+ (divisor = rtclock_sec_divisor);
+ nanosecs -= (t64 * NSEC_PER_SEC);
+ *result += (nanosecs * divisor) / NSEC_PER_SEC;
}
void
-clock_delay_until(
+machine_delay_until(
uint64_t deadline)
{
uint64_t now;
do {
- clock_get_uptime(&now);
+ now = mach_absolute_time();
} while (now < deadline);
}
-
-void
-delay(
- int usec)
-{
- delay_for_interval((usec < 0)? -usec: usec, NSEC_PER_USEC);
-}
projects / apple / xnu.git / blobdiff