[apple/xnu.git] / osfmk / kern / clock.h

/*
 * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * 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.
 * 
 * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/*
 */

#ifndef	_KERN_CLOCK_H_
#define	_KERN_CLOCK_H_

#include <stdint.h>
#include <mach/mach_types.h>
#include <mach/clock_types.h>
#include <mach/message.h>
#include <mach/mach_time.h>
#include <mach/boolean.h>

#include <kern/kern_types.h>

#include <sys/cdefs.h>


#ifdef	__LP64__

typedef unsigned long		clock_sec_t;
typedef unsigned int		clock_usec_t, clock_nsec_t;

#else	/* __LP64__ */

typedef uint32_t			clock_sec_t;
typedef uint32_t			clock_usec_t, clock_nsec_t;

#endif	/* __LP64__ */

#ifdef	MACH_KERNEL_PRIVATE

#include <kern/queue.h>

/*
 * Clock operations list structure. Contains vectors to machine
 * dependent clock routines.
 */
struct	clock_ops {
	int		(*c_config)(void);		/* configuration */

	int		(*c_init)(void);		/* initialize */

	kern_return_t	(*c_gettime)(	/* get time */
				mach_timespec_t			*cur_time);

	kern_return_t	(*c_getattr)(	/* get attributes */
				clock_flavor_t			flavor,
				clock_attr_t			attr,
				mach_msg_type_number_t	*count);
};
typedef const struct clock_ops	*clock_ops_t;
typedef struct clock_ops	clock_ops_data_t;

/*
 * Actual clock object data structure. Contains the machine
 * dependent operations list and clock operation ports.
 */
struct	clock {
	clock_ops_t		cl_ops;		/* operations list */
	struct ipc_port		*cl_service;	/* service port */
	struct ipc_port		*cl_control;	/* control port */
};
typedef struct clock		clock_data_t;

/*
 * Configure the clock system.
 */
extern void		clock_config(void);
extern void		clock_oldconfig(void);

/*
 * Initialize the clock system.
 */
extern void		clock_init(void);
extern void		clock_oldinit(void);

extern void		clock_timebase_init(void);

/*
 * Initialize the clock ipc service facility.
 */
extern void		clock_service_create(void);

extern void clock_gettimeofday_set_commpage(
		uint64_t				abstime,
		uint64_t				sec,
		uint64_t				frac,
		uint64_t				scale,
		uint64_t				tick_per_sec);

extern void			machine_delay_until(uint64_t interval,
						uint64_t		deadline);

extern uint32_t		hz_tick_interval;

extern void		nanotime_to_absolutetime(
					clock_sec_t		secs,
					clock_nsec_t	nanosecs,
					uint64_t		*result);

#endif /* MACH_KERNEL_PRIVATE */

__BEGIN_DECLS

#ifdef	XNU_KERNEL_PRIVATE

extern void			clock_adjtime(
						long		*secs,
						int			*microsecs);

extern void			clock_initialize_calendar(void);

extern void			clock_wakeup_calendar(void);

extern void 			clock_update_calendar(void);

extern void 			clock_get_calendar_uptime(clock_sec_t		*secs);

extern void clock_gettimeofday_new(clock_sec_t		*secs,
	clock_usec_t	*microsecs);
extern void			clock_gettimeofday(
						clock_sec_t			*secs,
						clock_usec_t		*microsecs);

extern void			clock_gettimeofday_and_absolute_time(
						clock_sec_t			*secs,
						clock_usec_t		*microsecs,
						uint64_t			*absolute_time);


extern void			clock_set_calendar_microtime(
						clock_sec_t			secs,
						clock_usec_t		microsecs);

extern void			clock_get_boottime_nanotime(
						clock_sec_t			*secs,
						clock_nsec_t		*nanosecs);

extern void			clock_get_boottime_microtime(
						clock_sec_t			*secs,
						clock_nsec_t		*microsecs);

extern void			absolutetime_to_microtime(
						uint64_t			abstime,
						clock_sec_t			*secs,
						clock_usec_t		*microsecs);

extern void			clock_deadline_for_periodic_event(
						uint64_t			interval,
						uint64_t			abstime,
						uint64_t			*deadline);

#if	CONFIG_DTRACE

extern void			clock_get_calendar_nanotime_nowait(
						clock_sec_t			*secs,
						clock_nsec_t		*nanosecs);

#endif	/* CONFIG_DTRACE */

boolean_t kdp_clock_is_locked(void);

#endif	/* XNU_KERNEL_PRIVATE */

extern void			clock_get_calendar_microtime(
						clock_sec_t			*secs,
						clock_usec_t		*microsecs);

extern void			clock_get_calendar_absolute_and_microtime(
						clock_sec_t			*secs,
						clock_usec_t		*microsecs,
						uint64_t    		*abstime);

extern void			clock_get_calendar_nanotime(
						clock_sec_t			*secs,
						clock_nsec_t		*nanosecs);

extern void			clock_get_system_microtime(
						clock_sec_t			*secs,
						clock_usec_t		*microsecs);

extern void			clock_get_system_nanotime(
						clock_sec_t			*secs,
						clock_nsec_t		*nanosecs);

extern void				clock_timebase_info(
							mach_timebase_info_t	info);

extern void				clock_get_uptime(
							uint64_t		*result);

extern void				clock_interval_to_deadline(
							uint32_t		interval,
							uint32_t		scale_factor,
							uint64_t		*result);

extern void				clock_interval_to_absolutetime_interval(
							uint32_t		interval,
							uint32_t		scale_factor,
							uint64_t		*result);

extern void				clock_absolutetime_interval_to_deadline(
							uint64_t		abstime,
							uint64_t		*result);

extern void				clock_continuoustime_interval_to_deadline(
							uint64_t		abstime,
							uint64_t		*result);

extern void				clock_delay_until(
							uint64_t		deadline);

extern void				absolutetime_to_nanoseconds(
							uint64_t		abstime,
							uint64_t		*result);

extern void				nanoseconds_to_absolutetime(
							uint64_t		nanoseconds,
							uint64_t		*result);

/*
 * Absolute <-> Continuous Time conversion routines
 *
 * It is the caller's responsibility to ensure that these functions are
 * synchronized with respect to updates to the continuous timebase.  The
 * returned value is only valid until the next update to the continuous
 * timebase.
 *
 * If the value to be returned by continuoustime_to_absolutetime would be
 * negative, zero is returned.  This occurs when the provided continuous time
 * is less the amount of the time the system spent asleep and /must/ be
 * handled.
 */
extern uint64_t			absolutetime_to_continuoustime(
							uint64_t		abstime);
extern uint64_t			continuoustime_to_absolutetime(
							uint64_t		conttime);

extern uint64_t mach_absolutetime_asleep;
extern uint64_t mach_absolutetime_last_sleep;

#ifdef	KERNEL_PRIVATE

/*
 * Obsolete interfaces.
 */

#ifndef	__LP64__

#define MACH_TIMESPEC_SEC_MAX		(0 - 1)
#define MACH_TIMESPEC_NSEC_MAX		(NSEC_PER_SEC - 1)

#define MACH_TIMESPEC_MAX	((mach_timespec_t) {				\
									MACH_TIMESPEC_SEC_MAX,		\
									MACH_TIMESPEC_NSEC_MAX } )
#define MACH_TIMESPEC_ZERO	((mach_timespec_t) { 0, 0 } )

#define ADD_MACH_TIMESPEC_NSEC(t1, nsec)		\
  do {											\
	(t1)->tv_nsec += (clock_res_t)(nsec);		\
	if ((clock_res_t)(nsec) > 0 &&				\
			(t1)->tv_nsec >= NSEC_PER_SEC) {	\
		(t1)->tv_nsec -= NSEC_PER_SEC;			\
		(t1)->tv_sec += 1;						\
	}											\
	else if ((clock_res_t)(nsec) < 0 &&			\
				 (t1)->tv_nsec < 0) {			\
		(t1)->tv_nsec += NSEC_PER_SEC;			\
		(t1)->tv_sec -= 1;						\
	}											\
  } while (0)

#include <Availability.h>

/* Use mach_absolute_time() */
extern mach_timespec_t	clock_get_system_value(void) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0, __MAC_10_8, __IPHONE_2_0, __IPHONE_6_0);

extern mach_timespec_t	clock_get_calendar_value(void) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0, __MAC_10_8, __IPHONE_2_0, __IPHONE_6_0);

#else	/* __LP64__ */

#ifdef	XNU_KERNEL_PRIVATE

#define MACH_TIMESPEC_ZERO	((mach_timespec_t) { 0, 0 } )

#endif	/* XNU_KERNEL_PRIVATE */

#endif	/* __LP64__ */

extern void				delay_for_interval(
							uint32_t		interval,
							uint32_t		scale_factor);

extern void				delay_for_interval_with_leeway(
							uint32_t		interval,
							uint32_t		leeway,
							uint32_t		scale_factor);

#ifdef	XNU_KERNEL_PRIVATE
extern void delay(int usec);
#endif	/* XNU_KERNEL_PRIVATE */

#endif	/* KERNEL_PRIVATE */

__END_DECLS

#endif	/* _KERN_CLOCK_H_ */
Commit	Line	Data
1c79356b	1	/*
c910b4d9	2	* Copyright (c) 2000-2008 Apple Inc. All rights reserved.
1c79356b	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
	31	/*
1c79356b A	32	*/
	33
	34	#ifndef _KERN_CLOCK_H_
	35	#define _KERN_CLOCK_H_
	36
91447636 A	37	#include <stdint.h>
91447636 A	38	#include <mach/mach_types.h>
1c79356b	39	#include <mach/clock_types.h>
91447636	40	#include <mach/message.h>
1c79356b	41	#include <mach/mach_time.h>
39037602	42	#include <mach/boolean.h>
1c79356b	43
91447636	44	#include <kern/kern_types.h>
9bccf70c	45
91447636	46	#include <sys/cdefs.h>
9bccf70c	47
5ba3f43e	48
b0d623f7 A	49	#ifdef __LP64__
	50
	51	typedef unsigned long clock_sec_t;
	52	typedef unsigned int clock_usec_t, clock_nsec_t;
	53
	54	#else /* __LP64__ */
	55
	56	typedef uint32_t clock_sec_t;
	57	typedef uint32_t clock_usec_t, clock_nsec_t;
	58
	59	#endif /* __LP64__ */
	60
9bccf70c A	61	#ifdef MACH_KERNEL_PRIVATE
9bccf70c A	62
c910b4d9 A	63	#include <kern/queue.h>
c910b4d9 A	64
1c79356b A	65	/*
1c79356b A	66	* Clock operations list structure. Contains vectors to machine
0c530ab8	67	* dependent clock routines.
1c79356b A	68	*/
	69	struct clock_ops {
	70	int (c_config)(void); / configuration */
	71
	72	int (c_init)(void); / initialize */
	73
	74	kern_return_t (c_gettime)( / get time */
	75	mach_timespec_t *cur_time);
	76
1c79356b A	77	kern_return_t (c_getattr)( / get attributes */
	78	clock_flavor_t flavor,
	79	clock_attr_t attr,
	80	mach_msg_type_number_t *count);
1c79356b	81	};
5ba3f43e	82	typedef const struct clock_ops *clock_ops_t;
1c79356b A	83	typedef struct clock_ops clock_ops_data_t;
	84
	85	/*
	86	* Actual clock object data structure. Contains the machine
0c530ab8	87	* dependent operations list and clock operation ports.
1c79356b A	88	*/
1c79356b A	89	struct clock {
5ba3f43e	90	clock_ops_t cl_ops; /* operations list */
1c79356b A	91	struct ipc_port cl_service; / service port */
1c79356b A	92	struct ipc_port cl_control; / control port */
1c79356b A	93	};
	94	typedef struct clock clock_data_t;
	95
	96	/*
	97	* Configure the clock system.
	98	*/
	99	extern void clock_config(void);
0c530ab8	100	extern void clock_oldconfig(void);
55e303ae	101
1c79356b A	102	/*
	103	* Initialize the clock system.
	104	*/
	105	extern void clock_init(void);
0c530ab8	106	extern void clock_oldinit(void);
1c79356b	107
55e303ae A	108	extern void clock_timebase_init(void);
55e303ae A	109
1c79356b A	110	/*
	111	* Initialize the clock ipc service facility.
	112	*/
	113	extern void clock_service_create(void);
	114
5ba3f43e A	115	extern void clock_gettimeofday_set_commpage(
	116	uint64_t abstime,
	117	uint64_t sec,
	118	uint64_t frac,
	119	uint64_t scale,
	120	uint64_t tick_per_sec);
9bccf70c	121
bd504ef0	122	extern void machine_delay_until(uint64_t interval,
91447636	123	uint64_t deadline);
1c79356b	124
2d21ac55	125	extern uint32_t hz_tick_interval;
9bccf70c	126
0c530ab8	127	extern void nanotime_to_absolutetime(
b0d623f7 A	128	clock_sec_t secs,
b0d623f7 A	129	clock_nsec_t nanosecs,
0c530ab8 A	130	uint64_t *result);
0c530ab8 A	131
91447636	132	#endif /* MACH_KERNEL_PRIVATE */
55e303ae	133
91447636 A	134	__BEGIN_DECLS
	135
	136	#ifdef XNU_KERNEL_PRIVATE
55e303ae A	137
55e303ae A	138	extern void clock_adjtime(
b0d623f7 A	139	long *secs,
b0d623f7 A	140	int *microsecs);
9bccf70c A	141
	142	extern void clock_initialize_calendar(void);
	143
55e303ae A	144	extern void clock_wakeup_calendar(void);
55e303ae A	145
5ba3f43e A	146	extern void clock_update_calendar(void);
	147
	148	extern void clock_get_calendar_uptime(clock_sec_t *secs);
	149
	150	extern void clock_gettimeofday_new(clock_sec_t *secs,
	151	clock_usec_t *microsecs);
55e303ae	152	extern void clock_gettimeofday(
b0d623f7 A	153	clock_sec_t *secs,
b0d623f7 A	154	clock_usec_t *microsecs);
55e303ae	155
39037602 A	156	extern void clock_gettimeofday_and_absolute_time(
	157	clock_sec_t *secs,
	158	clock_usec_t *microsecs,
	159	uint64_t *absolute_time);
	160
	161
91447636	162	extern void clock_set_calendar_microtime(
b0d623f7 A	163	clock_sec_t secs,
b0d623f7 A	164	clock_usec_t microsecs);
9bccf70c	165
91447636	166	extern void clock_get_boottime_nanotime(
b0d623f7 A	167	clock_sec_t *secs,
b0d623f7 A	168	clock_nsec_t *nanosecs);
9bccf70c	169
39037602 A	170	extern void clock_get_boottime_microtime(
	171	clock_sec_t *secs,
	172	clock_nsec_t *microsecs);
	173
2d21ac55	174	extern void absolutetime_to_microtime(
b0d623f7 A	175	uint64_t abstime,
	176	clock_sec_t *secs,
	177	clock_usec_t *microsecs);
2d21ac55	178
91447636 A	179	extern void clock_deadline_for_periodic_event(
	180	uint64_t interval,
	181	uint64_t abstime,
	182	uint64_t *deadline);
1c79356b	183
b0d623f7 A	184	#if CONFIG_DTRACE
	185
	186	extern void clock_get_calendar_nanotime_nowait(
	187	clock_sec_t *secs,
	188	clock_nsec_t *nanosecs);
	189
	190	#endif /* CONFIG_DTRACE */
	191
39037602 A	192	boolean_t kdp_clock_is_locked(void);
39037602 A	193
91447636	194	#endif /* XNU_KERNEL_PRIVATE */
1c79356b	195
91447636	196	extern void clock_get_calendar_microtime(
b0d623f7 A	197	clock_sec_t *secs,
b0d623f7 A	198	clock_usec_t *microsecs);
9bccf70c	199
39236c6e A	200	extern void clock_get_calendar_absolute_and_microtime(
	201	clock_sec_t *secs,
	202	clock_usec_t *microsecs,
	203	uint64_t *abstime);
	204
91447636	205	extern void clock_get_calendar_nanotime(
b0d623f7 A	206	clock_sec_t *secs,
b0d623f7 A	207	clock_nsec_t *nanosecs);
2d21ac55	208
91447636	209	extern void clock_get_system_microtime(
b0d623f7 A	210	clock_sec_t *secs,
b0d623f7 A	211	clock_usec_t *microsecs);
91447636 A	212
91447636 A	213	extern void clock_get_system_nanotime(
b0d623f7 A	214	clock_sec_t *secs,
b0d623f7 A	215	clock_nsec_t *nanosecs);
1c79356b	216
0b4e3aa0 A	217	extern void clock_timebase_info(
	218	mach_timebase_info_t info);
	219
	220	extern void clock_get_uptime(
	221	uint64_t *result);
	222
	223	extern void clock_interval_to_deadline(
	224	uint32_t interval,
	225	uint32_t scale_factor,
	226	uint64_t *result);
	227
	228	extern void clock_interval_to_absolutetime_interval(
	229	uint32_t interval,
	230	uint32_t scale_factor,
	231	uint64_t *result);
	232
	233	extern void clock_absolutetime_interval_to_deadline(
	234	uint64_t abstime,
	235	uint64_t *result);
	236
39037602 A	237	extern void clock_continuoustime_interval_to_deadline(
	238	uint64_t abstime,
	239	uint64_t *result);
	240
0b4e3aa0 A	241	extern void clock_delay_until(
	242	uint64_t deadline);
	243
	244	extern void absolutetime_to_nanoseconds(
	245	uint64_t abstime,
	246	uint64_t *result);
	247
39037602	248	extern void nanoseconds_to_absolutetime(
0b4e3aa0 A	249	uint64_t nanoseconds,
	250	uint64_t *result);
	251
39037602 A	252	/*
	253	* Absolute <-> Continuous Time conversion routines
	254	*
	255	* It is the caller's responsibility to ensure that these functions are
	256	* synchronized with respect to updates to the continuous timebase. The
	257	* returned value is only valid until the next update to the continuous
	258	* timebase.
	259	*
	260	* If the value to be returned by continuoustime_to_absolutetime would be
	261	* negative, zero is returned. This occurs when the provided continuous time
	262	* is less the amount of the time the system spent asleep and /must/ be
	263	* handled.
	264	*/
	265	extern uint64_t absolutetime_to_continuoustime(
	266	uint64_t abstime);
	267	extern uint64_t continuoustime_to_absolutetime(
	268	uint64_t conttime);
	269
3e170ce0 A	270	extern uint64_t mach_absolutetime_asleep;
	271	extern uint64_t mach_absolutetime_last_sleep;
	272
91447636	273	#ifdef KERNEL_PRIVATE
0b4e3aa0	274
91447636 A	275	/*
	276	* Obsolete interfaces.
	277	*/
	278
b0d623f7 A	279	#ifndef __LP64__
b0d623f7 A	280
91447636 A	281	#define MACH_TIMESPEC_SEC_MAX (0 - 1)
	282	#define MACH_TIMESPEC_NSEC_MAX (NSEC_PER_SEC - 1)
	283
	284	#define MACH_TIMESPEC_MAX ((mach_timespec_t) { \
	285	MACH_TIMESPEC_SEC_MAX, \
	286	MACH_TIMESPEC_NSEC_MAX } )
	287	#define MACH_TIMESPEC_ZERO ((mach_timespec_t) { 0, 0 } )
	288
	289	#define ADD_MACH_TIMESPEC_NSEC(t1, nsec) \
	290	do { \
	291	(t1)->tv_nsec += (clock_res_t)(nsec); \
	292	if ((clock_res_t)(nsec) > 0 && \
	293	(t1)->tv_nsec >= NSEC_PER_SEC) { \
	294	(t1)->tv_nsec -= NSEC_PER_SEC; \
	295	(t1)->tv_sec += 1; \
	296	} \
	297	else if ((clock_res_t)(nsec) < 0 && \
	298	(t1)->tv_nsec < 0) { \
	299	(t1)->tv_nsec += NSEC_PER_SEC; \
	300	(t1)->tv_sec -= 1; \
	301	} \
	302	} while (0)
	303
316670eb	304	#include <Availability.h>
91447636	305
316670eb	306	/* Use mach_absolute_time() */
39236c6e	307	extern mach_timespec_t clock_get_system_value(void) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0, __MAC_10_8, __IPHONE_2_0, __IPHONE_6_0);
91447636	308
39236c6e	309	extern mach_timespec_t clock_get_calendar_value(void) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0, __MAC_10_8, __IPHONE_2_0, __IPHONE_6_0);
91447636	310
b0d623f7 A	311	#else /* __LP64__ */
	312
	313	#ifdef XNU_KERNEL_PRIVATE
	314
	315	#define MACH_TIMESPEC_ZERO ((mach_timespec_t) { 0, 0 } )
	316
	317	#endif /* XNU_KERNEL_PRIVATE */
	318
	319	#endif /* __LP64__ */
	320
91447636 A	321	extern void delay_for_interval(
	322	uint32_t interval,
	323	uint32_t scale_factor);
b0d623f7	324
3e170ce0 A	325	extern void delay_for_interval_with_leeway(
	326	uint32_t interval,
	327	uint32_t leeway,
	328	uint32_t scale_factor);
	329
39037602 A	330	#ifdef XNU_KERNEL_PRIVATE
	331	extern void delay(int usec);
	332	#endif /* XNU_KERNEL_PRIVATE */
	333
91447636	334	#endif /* KERNEL_PRIVATE */
1c79356b	335
91447636	336	__END_DECLS
1c79356b A	337
1c79356b A	338	#endif /* _KERN_CLOCK_H_ */