[apple/xnu.git] / bsd / kern / kern_clock.c

/*
 * Copyright (c) 2000-2007 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@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*-
 * Copyright (c) 1982, 1986, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)kern_clock.c	8.5 (Berkeley) 1/21/94
 */
/*
 * HISTORY
 */

#include <machine/spl.h>

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/resource.h>
#include <sys/proc_internal.h>
#include <sys/vm.h>
#include <sys/sysctl.h>

#ifdef GPROF
#include <sys/gmon.h>
#endif

#include <kern/thread.h>
#include <kern/ast.h>
#include <kern/assert.h>
#include <mach/boolean.h>

#include <kern/thread_call.h>

void bsd_uprofil(struct time_value *syst, user_addr_t pc);
int tvtohz(struct timeval *tv);

/*
 * Clock handling routines.
 *
 * This code is written to operate with two timers which run
 * independently of each other. The main clock, running at hz
 * times per second, is used to do scheduling and timeout calculations.
 * The second timer does resource utilization estimation statistically
 * based on the state of the machine phz times a second. Both functions
 * can be performed by a single clock (ie hz == phz), however the 
 * statistics will be much more prone to errors. Ideally a machine
 * would have separate clocks measuring time spent in user state, system
 * state, interrupt state, and idle state. These clocks would allow a non-
 * approximate measure of resource utilization.
 */

/*
 * The hz hardware interval timer.
 */

int             hz = 100;                /* GET RID OF THIS !!! */
int             tick = (1000000 / 100);  /* GET RID OF THIS !!! */

/*
 * Kernel timeout services.
 */

/*
 *	Set a timeout.
 *
 *	fcn:		function to call
 *	param:		parameter to pass to function
 *	interval:	timeout interval, in hz.
 */
void
timeout(
	timeout_fcn_t			fcn,
	void					*param,
	int						interval)
{
	uint64_t		deadline;

	clock_interval_to_deadline(interval, NSEC_PER_SEC / hz, &deadline);
	thread_call_func_delayed((thread_call_func_t)fcn, param, deadline);
}

/*
 * Cancel a timeout.
 */
void
untimeout(
	timeout_fcn_t		fcn,
	void			*param)
{
	thread_call_func_cancel((thread_call_func_t)fcn, param, FALSE);
}


/*
 *	Set a timeout.
 *
 *	fcn:		function to call
 *	param:		parameter to pass to function
 *	ts:		timeout interval, in timespec
 */
void
bsd_timeout(
	timeout_fcn_t			fcn,
	void					*param,
	struct timespec         *ts)
{
	uint64_t		deadline = 0;

	if (ts && (ts->tv_sec || ts->tv_nsec)) {
		nanoseconds_to_absolutetime((uint64_t)ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec,  &deadline );
		clock_absolutetime_interval_to_deadline( deadline, &deadline );
	}
	thread_call_func_delayed((thread_call_func_t)fcn, param, deadline);
}

/*
 * Cancel a timeout.
 */
void
bsd_untimeout(
	timeout_fcn_t		fcn,
	void			*param)
{
	thread_call_func_cancel((thread_call_func_t)fcn, param, FALSE);
}


/*
 * Compute number of hz until specified time.
 * Used to compute third argument to timeout() from an
 * absolute time.
 */
int
hzto(struct timeval *tv)
{
	struct timeval now;
	long ticks;
	long sec;

	microtime(&now);
	/*
	 * If number of milliseconds will fit in 32 bit arithmetic,
	 * then compute number of milliseconds to time and scale to
	 * ticks.  Otherwise just compute number of hz in time, rounding
	 * times greater than representible to maximum value.
	 *
	 * Delta times less than 25 days can be computed ``exactly''.
	 * Maximum value for any timeout in 10ms ticks is 250 days.
	 */
	sec = tv->tv_sec - now.tv_sec;
	if (sec <= 0x7fffffff / 1000 - 1000)
		ticks = ((tv->tv_sec - now.tv_sec) * 1000 +
			(tv->tv_usec - now.tv_usec) / 1000)
				/ (tick / 1000);
	else if (sec <= 0x7fffffff / hz)
		ticks = sec * hz;
	else
		ticks = 0x7fffffff;

	return (ticks);
}

/*
 * Return information about system clocks.
 */
static int
sysctl_clockrate
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, __unused struct sysctl_req *req)
{
	struct clockinfo clkinfo;

	/*
	 * Construct clockinfo structure.
	 */
	clkinfo.hz = hz;
	clkinfo.tick = tick;
	clkinfo.profhz = hz;
	clkinfo.stathz = hz;
	return sysctl_io_opaque(req, &clkinfo, sizeof(clkinfo), NULL);
}

SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate,
		CTLTYPE_STRUCT | CTLFLAG_RD,
		0, 0, sysctl_clockrate, "S,clockinfo", "");


/*
 * Compute number of ticks in the specified amount of time.
 */
int
tvtohz(struct timeval *tv)
{
	unsigned long ticks;
	long sec, usec;

	/*
	 * If the number of usecs in the whole seconds part of the time
	 * difference fits in a long, then the total number of usecs will
	 * fit in an unsigned long.  Compute the total and convert it to
	 * ticks, rounding up and adding 1 to allow for the current tick
	 * to expire.  Rounding also depends on unsigned long arithmetic
	 * to avoid overflow.
	 *
	 * Otherwise, if the number of ticks in the whole seconds part of
	 * the time difference fits in a long, then convert the parts to
	 * ticks separately and add, using similar rounding methods and
	 * overflow avoidance.  This method would work in the previous
	 * case but it is slightly slower and assumes that hz is integral.
	 *
	 * Otherwise, round the time difference down to the maximum
	 * representable value.
	 *
	 * If ints have 32 bits, then the maximum value for any timeout in
	 * 10ms ticks is 248 days.
	 */
	sec = tv->tv_sec;
	usec = tv->tv_usec;
	if (usec < 0) {
		sec--;
		usec += 1000000;
	}
	if (sec < 0) {
#ifdef DIAGNOSTIC
		if (usec > 0) {
			sec++;
			usec -= 1000000;
		}
		printf("tvotohz: negative time difference %ld sec %ld usec\n",
		       sec, usec);
#endif
		ticks = 1;
	} else if (sec <= LONG_MAX / 1000000)
		ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1))
			/ tick + 1;
	else if (sec <= LONG_MAX / hz)
		ticks = sec * hz
			+ ((unsigned long)usec + (tick - 1)) / tick + 1;
	else
		ticks = LONG_MAX;
	if (ticks > INT_MAX)
		ticks = INT_MAX;
	return ((int)ticks);
}


/*
 * Start profiling on a process.
 *
 * Kernel profiling passes kernel_proc which never exits and hence
 * keeps the profile clock running constantly.
 */
void
startprofclock(struct proc *p)
{
	if ((p->p_flag & P_PROFIL) == 0)
		OSBitOrAtomic(P_PROFIL, (UInt32 *)&p->p_flag);
}

/*
 * Stop profiling on a process.
 */
void
stopprofclock(struct proc *p)
{
	if (p->p_flag & P_PROFIL)
		OSBitAndAtomic(~((uint32_t)P_PROFIL), (UInt32 *)&p->p_flag);
}

/* TBD locking user profiling is not resolved yet */
void
bsd_uprofil(struct time_value *syst, user_addr_t pc)
{
	struct proc *p = current_proc();
	int		ticks;
	struct timeval	*tv;
	struct timeval st;

	if (p == NULL)
	        return;
	if ( !(p->p_flag & P_PROFIL))
	        return;

	st.tv_sec = syst->seconds;
	st.tv_usec = syst->microseconds;

	tv = &(p->p_stats->p_ru.ru_stime);

	ticks = ((tv->tv_sec - st.tv_sec) * 1000 +
		(tv->tv_usec - st.tv_usec) / 1000) /
		(tick / 1000);
	if (ticks)
		addupc_task(p, pc, ticks);
}

/* TBD locking user profiling is not resolved yet */
void
get_procrustime(time_value_t *tv)
{
	struct proc *p = current_proc();
	struct timeval st;

	if (p == NULL) 
		return;
	if ( !(p->p_flag & P_PROFIL))
	        return;

	//proc_lock(p);
	st = p->p_stats->p_ru.ru_stime;
	//proc_unlock(p);
	
	tv->seconds = st.tv_sec;
	tv->microseconds = st.tv_usec;
}
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
5d5c5d0d	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	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	29	/*-
	30	* Copyright (c) 1982, 1986, 1991, 1993
	31	* The Regents of the University of California. All rights reserved.
	32	* (c) UNIX System Laboratories, Inc.
	33	* All or some portions of this file are derived from material licensed
	34	* to the University of California by American Telephone and Telegraph
	35	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	36	* the permission of UNIX System Laboratories, Inc.
	37	*
	38	* Redistribution and use in source and binary forms, with or without
	39	* modification, are permitted provided that the following conditions
	40	* are met:
	41	* 1. Redistributions of source code must retain the above copyright
	42	* notice, this list of conditions and the following disclaimer.
	43	* 2. Redistributions in binary form must reproduce the above copyright
	44	* notice, this list of conditions and the following disclaimer in the
	45	* documentation and/or other materials provided with the distribution.
	46	* 3. All advertising materials mentioning features or use of this software
	47	* must display the following acknowledgement:
	48	* This product includes software developed by the University of
	49	* California, Berkeley and its contributors.
	50	* 4. Neither the name of the University nor the names of its contributors
	51	* may be used to endorse or promote products derived from this software
	52	* without specific prior written permission.
	53	*
	54	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	55	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	56	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	57	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	58	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	59	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	60	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	61	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	62	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	63	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	64	* SUCH DAMAGE.
	65	*
	66	* @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
	67	*/
	68	/*
	69	* HISTORY
	70	*/
	71
	72	#include <machine/spl.h>
	73
	74	#include <sys/param.h>
	75	#include <sys/systm.h>
	76	#include <sys/time.h>
1c79356b A	77	#include <sys/resourcevar.h>
	78	#include <sys/kernel.h>
	79	#include <sys/resource.h>
91447636	80	#include <sys/proc_internal.h>
1c79356b	81	#include <sys/vm.h>
91447636	82	#include <sys/sysctl.h>
1c79356b A	83
	84	#ifdef GPROF
	85	#include <sys/gmon.h>
	86	#endif
	87
	88	#include <kern/thread.h>
	89	#include <kern/ast.h>
	90	#include <kern/assert.h>
	91	#include <mach/boolean.h>
	92
	93	#include <kern/thread_call.h>
	94
91447636	95	void bsd_uprofil(struct time_value *syst, user_addr_t pc);
91447636	96	int tvtohz(struct timeval *tv);
91447636	97
1c79356b A	98	/*
	99	* Clock handling routines.
	100	*
	101	* This code is written to operate with two timers which run
	102	* independently of each other. The main clock, running at hz
	103	* times per second, is used to do scheduling and timeout calculations.
	104	* The second timer does resource utilization estimation statistically
	105	* based on the state of the machine phz times a second. Both functions
	106	* can be performed by a single clock (ie hz == phz), however the
	107	* statistics will be much more prone to errors. Ideally a machine
	108	* would have separate clocks measuring time spent in user state, system
	109	* state, interrupt state, and idle state. These clocks would allow a non-
	110	* approximate measure of resource utilization.
	111	*/
	112
	113	/*
	114	* The hz hardware interval timer.
1c79356b A	115	*/
1c79356b A	116
91447636 A	117	int hz = 100; /* GET RID OF THIS !!! */
	118	int tick = (1000000 / 100); /* GET RID OF THIS !!! */
	119
1c79356b A	120	/*
	121	* Kernel timeout services.
	122	*/
	123
	124	/*
	125	* Set a timeout.
	126	*
	127	* fcn: function to call
	128	* param: parameter to pass to function
	129	* interval: timeout interval, in hz.
	130	*/
	131	void
	132	timeout(
	133	timeout_fcn_t fcn,
	134	void *param,
	135	int interval)
	136	{
0b4e3aa0	137	uint64_t deadline;
1c79356b A	138
	139	clock_interval_to_deadline(interval, NSEC_PER_SEC / hz, &deadline);
	140	thread_call_func_delayed((thread_call_func_t)fcn, param, deadline);
	141	}
	142
	143	/*
	144	* Cancel a timeout.
	145	*/
	146	void
	147	untimeout(
2d21ac55 A	148	timeout_fcn_t fcn,
2d21ac55 A	149	void *param)
1c79356b A	150	{
	151	thread_call_func_cancel((thread_call_func_t)fcn, param, FALSE);
	152	}
	153
	154
91447636 A	155	/*
	156	* Set a timeout.
	157	*
	158	* fcn: function to call
	159	* param: parameter to pass to function
	160	* ts: timeout interval, in timespec
	161	*/
	162	void
	163	bsd_timeout(
	164	timeout_fcn_t fcn,
	165	void *param,
	166	struct timespec *ts)
	167	{
	168	uint64_t deadline = 0;
	169
	170	if (ts && (ts->tv_sec \|\| ts->tv_nsec)) {
	171	nanoseconds_to_absolutetime((uint64_t)ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec, &deadline );
	172	clock_absolutetime_interval_to_deadline( deadline, &deadline );
	173	}
	174	thread_call_func_delayed((thread_call_func_t)fcn, param, deadline);
	175	}
	176
	177	/*
	178	* Cancel a timeout.
	179	*/
	180	void
	181	bsd_untimeout(
2d21ac55 A	182	timeout_fcn_t fcn,
2d21ac55 A	183	void *param)
91447636 A	184	{
	185	thread_call_func_cancel((thread_call_func_t)fcn, param, FALSE);
	186	}
	187
1c79356b A	188
	189	/*
	190	* Compute number of hz until specified time.
	191	* Used to compute third argument to timeout() from an
	192	* absolute time.
	193	*/
91447636	194	int
2d21ac55	195	hzto(struct timeval *tv)
1c79356b	196	{
9bccf70c	197	struct timeval now;
2d21ac55 A	198	long ticks;
2d21ac55 A	199	long sec;
9bccf70c A	200
9bccf70c A	201	microtime(&now);
1c79356b A	202	/*
	203	* If number of milliseconds will fit in 32 bit arithmetic,
	204	* then compute number of milliseconds to time and scale to
	205	* ticks. Otherwise just compute number of hz in time, rounding
	206	* times greater than representible to maximum value.
	207	*
	208	* Delta times less than 25 days can be computed ``exactly''.
	209	* Maximum value for any timeout in 10ms ticks is 250 days.
	210	*/
9bccf70c	211	sec = tv->tv_sec - now.tv_sec;
1c79356b	212	if (sec <= 0x7fffffff / 1000 - 1000)
9bccf70c A	213	ticks = ((tv->tv_sec - now.tv_sec) * 1000 +
9bccf70c A	214	(tv->tv_usec - now.tv_usec) / 1000)
1c79356b A	215	/ (tick / 1000);
	216	else if (sec <= 0x7fffffff / hz)
	217	ticks = sec * hz;
	218	else
	219	ticks = 0x7fffffff;
1c79356b	220
9bccf70c	221	return (ticks);
1c79356b	222	}
1c79356b A	223
	224	/*
	225	* Return information about system clocks.
	226	*/
2d21ac55 A	227	static int
	228	sysctl_clockrate
	229	(__unused struct sysctl_oid oidp, __unused void arg1, __unused int arg2, __unused struct sysctl_req *req)
1c79356b A	230	{
	231	struct clockinfo clkinfo;
	232
	233	/*
	234	* Construct clockinfo structure.
	235	*/
	236	clkinfo.hz = hz;
	237	clkinfo.tick = tick;
	238	clkinfo.profhz = hz;
	239	clkinfo.stathz = hz;
2d21ac55	240	return sysctl_io_opaque(req, &clkinfo, sizeof(clkinfo), NULL);
1c79356b A	241	}
1c79356b A	242
2d21ac55 A	243	SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate,
	244	CTLTYPE_STRUCT \| CTLFLAG_RD,
	245	0, 0, sysctl_clockrate, "S,clockinfo", "");
	246
1c79356b A	247
	248	/*
	249	* Compute number of ticks in the specified amount of time.
	250	*/
	251	int
91447636	252	tvtohz(struct timeval *tv)
1c79356b	253	{
2d21ac55 A	254	unsigned long ticks;
2d21ac55 A	255	long sec, usec;
1c79356b A	256
	257	/*
	258	* If the number of usecs in the whole seconds part of the time
	259	* difference fits in a long, then the total number of usecs will
	260	* fit in an unsigned long. Compute the total and convert it to
	261	* ticks, rounding up and adding 1 to allow for the current tick
	262	* to expire. Rounding also depends on unsigned long arithmetic
	263	* to avoid overflow.
	264	*
	265	* Otherwise, if the number of ticks in the whole seconds part of
	266	* the time difference fits in a long, then convert the parts to
	267	* ticks separately and add, using similar rounding methods and
	268	* overflow avoidance. This method would work in the previous
	269	* case but it is slightly slower and assumes that hz is integral.
	270	*
	271	* Otherwise, round the time difference down to the maximum
	272	* representable value.
	273	*
	274	* If ints have 32 bits, then the maximum value for any timeout in
	275	* 10ms ticks is 248 days.
	276	*/
	277	sec = tv->tv_sec;
	278	usec = tv->tv_usec;
	279	if (usec < 0) {
	280	sec--;
	281	usec += 1000000;
	282	}
	283	if (sec < 0) {
	284	#ifdef DIAGNOSTIC
	285	if (usec > 0) {
	286	sec++;
	287	usec -= 1000000;
	288	}
	289	printf("tvotohz: negative time difference %ld sec %ld usec\n",
	290	sec, usec);
	291	#endif
	292	ticks = 1;
	293	} else if (sec <= LONG_MAX / 1000000)
	294	ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1))
	295	/ tick + 1;
	296	else if (sec <= LONG_MAX / hz)
	297	ticks = sec * hz
	298	+ ((unsigned long)usec + (tick - 1)) / tick + 1;
	299	else
	300	ticks = LONG_MAX;
	301	if (ticks > INT_MAX)
	302	ticks = INT_MAX;
	303	return ((int)ticks);
	304	}
	305
	306
	307	/*
	308	* Start profiling on a process.
	309	*
	310	* Kernel profiling passes kernel_proc which never exits and hence
	311	* keeps the profile clock running constantly.
	312	*/
	313	void
2d21ac55	314	startprofclock(struct proc *p)
1c79356b A	315	{
1c79356b A	316	if ((p->p_flag & P_PROFIL) == 0)
2d21ac55	317	OSBitOrAtomic(P_PROFIL, (UInt32 *)&p->p_flag);
1c79356b A	318	}
	319
	320	/*
	321	* Stop profiling on a process.
	322	*/
	323	void
2d21ac55	324	stopprofclock(struct proc *p)
1c79356b A	325	{
1c79356b A	326	if (p->p_flag & P_PROFIL)
2d21ac55	327	OSBitAndAtomic(~((uint32_t)P_PROFIL), (UInt32 *)&p->p_flag);
1c79356b A	328	}
1c79356b A	329
2d21ac55	330	/* TBD locking user profiling is not resolved yet */
1c79356b	331	void
91447636	332	bsd_uprofil(struct time_value *syst, user_addr_t pc)
1c79356b	333	{
2d21ac55 A	334	struct proc *p = current_proc();
	335	int ticks;
	336	struct timeval *tv;
	337	struct timeval st;
1c79356b A	338
	339	if (p == NULL)
	340	return;
	341	if ( !(p->p_flag & P_PROFIL))
	342	return;
	343
	344	st.tv_sec = syst->seconds;
	345	st.tv_usec = syst->microseconds;
	346
	347	tv = &(p->p_stats->p_ru.ru_stime);
	348
	349	ticks = ((tv->tv_sec - st.tv_sec) * 1000 +
	350	(tv->tv_usec - st.tv_usec) / 1000) /
	351	(tick / 1000);
	352	if (ticks)
	353	addupc_task(p, pc, ticks);
	354	}
	355
2d21ac55	356	/* TBD locking user profiling is not resolved yet */
1c79356b A	357	void
	358	get_procrustime(time_value_t *tv)
	359	{
	360	struct proc *p = current_proc();
	361	struct timeval st;
	362
	363	if (p == NULL)
	364	return;
	365	if ( !(p->p_flag & P_PROFIL))
	366	return;
	367
2d21ac55	368	//proc_lock(p);
1c79356b	369	st = p->p_stats->p_ru.ru_stime;
2d21ac55	370	//proc_unlock(p);
1c79356b A	371
	372	tv->seconds = st.tv_sec;
	373	tv->microseconds = st.tv_usec;
	374	}