[apple/xnu.git] / osfmk / kern / mach_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@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */
/*
 *	File:	clock_prim.c
 *	Author:	Avadis Tevanian, Jr.
 *	Date:	1986
 *
 *	Clock primitives.
 */
#include <gprof.h>

#include <mach/boolean.h>
#include <mach/machine.h>
#include <mach/time_value.h>
#include <mach/vm_param.h>
#include <mach/vm_prot.h>
#include <kern/clock.h>
#include <kern/cpu_number.h>
#include <kern/host.h>
#include <kern/lock.h>
#include <kern/mach_param.h>
#include <kern/misc_protos.h>
#include <kern/processor.h>
#include <kern/sched.h>
#include <kern/sched_prim.h>
#include <kern/thread.h>

#include <profiling/profile-mk.h>

#if GPROF
static void prof_tick(boolean_t usermode, natural_t pc);
#endif

#if STAT_TIME || GPROF
/*
 * Hertz rate clock interrupt servicing. Used to update processor
 * statistics and perform kernel profiling.
 */
void
hertz_tick(
#if GPROF
	__unused natural_t	ticks,
#else
	natural_t		ticks,
#endif
	boolean_t		usermode,
#if GPROF
	natural_t		pc)
#else
	__unused natural_t		pc)
#endif
{
	processor_t		processor = current_processor();
	thread_t		thread = current_thread();
	timer_t			state;

	if (usermode) {
		TIMER_BUMP(&thread->user_timer, ticks);

		state = &PROCESSOR_DATA(processor, user_state);
	}
	else {
		/* If this thread is idling, do not charge that time as system time */
		if ((thread->state & TH_IDLE) == 0) {
			TIMER_BUMP(&thread->system_timer, ticks);
		}
        
		if (processor->state == PROCESSOR_IDLE)
			state = &PROCESSOR_DATA(processor, idle_state);
		else
			state = &PROCESSOR_DATA(processor, system_state);
	}

	TIMER_BUMP(state, ticks);

#if GPROF
	prof_tick(usermode, pc);
#endif	/* GPROF */
}

#endif	/* STAT_TIME */

#if GPROF

static void
prof_tick(
	boolean_t	usermode,
	natural_t	pc)
{
	struct profile_vars	*pv;
	prof_uptrint_t		s;

	pv = PROFILE_VARS(cpu_number());

	if (usermode) {
		if (pv->active)
			PROF_CNT_INC(pv->stats.user_ticks);
	}
	else {
		if (pv->active) {
			if (current_processor()->state == CPU_STATE_IDLE)
				PROF_CNT_INC(pv->stats.idle_ticks);
			else
				PROF_CNT_INC(pv->stats.kernel_ticks);

			if ((prof_uptrint_t)pc < _profile_vars.profil_info.lowpc)
				PROF_CNT_INC(pv->stats.too_low);
			else {
				s = (prof_uptrint_t)pc - _profile_vars.profil_info.lowpc;
				if (s < pv->profil_info.text_len) {
					LHISTCOUNTER *ptr = (LHISTCOUNTER *) pv->profil_buf;
					LPROF_CNT_INC(ptr[s / HISTFRACTION]);
				}
				else
					PROF_CNT_INC(pv->stats.too_high);
			}
		}
	}
}

#endif	/* GPROF */
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 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	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
	56	/*
	57	*/
	58	/*
	59	* File: clock_prim.c
	60	* Author: Avadis Tevanian, Jr.
	61	* Date: 1986
	62	*
	63	* Clock primitives.
	64	*/
1c79356b A	65	#include <gprof.h>
	66
	67	#include <mach/boolean.h>
	68	#include <mach/machine.h>
	69	#include <mach/time_value.h>
	70	#include <mach/vm_param.h>
	71	#include <mach/vm_prot.h>
	72	#include <kern/clock.h>
1c79356b A	73	#include <kern/cpu_number.h>
	74	#include <kern/host.h>
	75	#include <kern/lock.h>
	76	#include <kern/mach_param.h>
	77	#include <kern/misc_protos.h>
	78	#include <kern/processor.h>
1c79356b A	79	#include <kern/sched.h>
1c79356b A	80	#include <kern/sched_prim.h>
1c79356b	81	#include <kern/thread.h>
1c79356b A	82
	83	#include <profiling/profile-mk.h>
	84
2d21ac55 A	85	#if GPROF
	86	static void prof_tick(boolean_t usermode, natural_t pc);
	87	#endif
1c79356b	88
2d21ac55	89	#if STAT_TIME \|\| GPROF
1c79356b	90	/*
2d21ac55 A	91	* Hertz rate clock interrupt servicing. Used to update processor
2d21ac55 A	92	* statistics and perform kernel profiling.
1c79356b A	93	*/
	94	void
	95	hertz_tick(
2d21ac55 A	96	#if GPROF
	97	__unused natural_t ticks,
	98	#else
91447636	99	natural_t ticks,
2d21ac55	100	#endif
91447636	101	boolean_t usermode,
2d21ac55	102	#if GPROF
91447636	103	natural_t pc)
2d21ac55 A	104	#else
	105	__unused natural_t pc)
	106	#endif
1c79356b	107	{
91447636 A	108	processor_t processor = current_processor();
91447636 A	109	thread_t thread = current_thread();
2d21ac55	110	timer_t state;
1c79356b A	111
1c79356b A	112	if (usermode) {
91447636	113	TIMER_BUMP(&thread->user_timer, ticks);
2d21ac55 A	114
2d21ac55 A	115	state = &PROCESSOR_DATA(processor, user_state);
1c79356b A	116	}
1c79356b A	117	else {
4a3eedf9 A	118	/* If this thread is idling, do not charge that time as system time */
	119	if ((thread->state & TH_IDLE) == 0) {
	120	TIMER_BUMP(&thread->system_timer, ticks);
	121	}
	122
2d21ac55 A	123	if (processor->state == PROCESSOR_IDLE)
2d21ac55 A	124	state = &PROCESSOR_DATA(processor, idle_state);
55e303ae	125	else
2d21ac55 A	126	state = &PROCESSOR_DATA(processor, system_state);
	127	}
	128
	129	TIMER_BUMP(state, ticks);
	130
1c79356b	131	#if GPROF
2d21ac55 A	132	prof_tick(usermode, pc);
	133	#endif /* GPROF */
	134	}
	135
	136	#endif /* STAT_TIME */
	137
	138	#if GPROF
	139
	140	static void
	141	prof_tick(
	142	boolean_t usermode,
	143	natural_t pc)
	144	{
	145	struct profile_vars *pv;
	146	prof_uptrint_t s;
	147
	148	pv = PROFILE_VARS(cpu_number());
	149
	150	if (usermode) {
	151	if (pv->active)
	152	PROF_CNT_INC(pv->stats.user_ticks);
	153	}
	154	else {
1c79356b	155	if (pv->active) {
2d21ac55	156	if (current_processor()->state == CPU_STATE_IDLE)
1c79356b	157	PROF_CNT_INC(pv->stats.idle_ticks);
2d21ac55 A	158	else
2d21ac55 A	159	PROF_CNT_INC(pv->stats.kernel_ticks);
1c79356b A	160
	161	if ((prof_uptrint_t)pc < _profile_vars.profil_info.lowpc)
	162	PROF_CNT_INC(pv->stats.too_low);
	163	else {
	164	s = (prof_uptrint_t)pc - _profile_vars.profil_info.lowpc;
	165	if (s < pv->profil_info.text_len) {
	166	LHISTCOUNTER ptr = (LHISTCOUNTER ) pv->profil_buf;
	167	LPROF_CNT_INC(ptr[s / HISTFRACTION]);
	168	}
	169	else
	170	PROF_CNT_INC(pv->stats.too_high);
	171	}
	172	}
1c79356b	173	}
1c79356b	174	}
2d21ac55 A	175
2d21ac55 A	176	#endif /* GPROF */