1/* 2 * Copyright (c) 2000-2007 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 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. 14 * 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 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 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. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * @OSF_COPYRIGHT@ 30 */ 31/* 32 * Mach Operating System 33 * Copyright (c) 1991,1990,1989,1988,1987 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#include <machine_timer_routines.h> 60 61#include <mach/kern_return.h> 62#include <mach/port.h> 63#include <kern/queue.h> 64#include <kern/processor.h> 65#include <kern/thread.h> 66#include <kern/sched_prim.h> 67#include <kern/timer.h> 68 69int precise_user_kernel_time = 1; 70 71/* 72 * timer_init initializes a timer. 73 */ 74void 75timer_init( 76 timer_t timer) 77{ 78 timer->tstamp = 0; 79#if defined(__LP64__) 80 timer->all_bits = 0; 81#else 82 timer->low_bits = 0; 83 timer->high_bits = 0; 84 timer->high_bits_check = 0; 85#endif /* defined(__LP64__) */ 86} 87 88/* 89 * Calculate the difference between a timer 90 * and saved value, and update the saved value. 91 */ 92uint64_t 93timer_delta( 94 timer_t timer, 95 uint64_t *save) 96{ 97 uint64_t new, old = *save; 98 99 *save = new = timer_grab(timer); 100 101 return (new - old); 102} 103 104void 105timer_advance( 106 timer_t timer, 107 uint64_t delta) 108{ 109#if defined(__LP64__) 110 timer->all_bits += delta; 111#else 112 uint64_t low; 113 114 low = delta + timer->low_bits; 115 if (low >> 32) 116 timer_update(timer, (uint32_t)(timer->high_bits + (low >> 32)), (uint32_t)low); 117 else 118 timer->low_bits = (uint32_t)low; 119#endif /* defined(__LP64__) */ 120} 121 122void 123timer_start( 124 timer_t timer, 125 uint64_t tstamp) 126{ 127 timer->tstamp = tstamp; 128} 129 130void 131timer_stop( 132 timer_t timer, 133 uint64_t tstamp) 134{ 135 timer_advance(timer, tstamp - timer->tstamp); 136} 137 138/* 139 * Update the timer and start a new one. 140 */ 141void 142timer_switch( 143 timer_t timer, 144 uint64_t tstamp, 145 timer_t new_timer) 146{ 147 timer_advance(timer, tstamp - timer->tstamp); 148 new_timer->tstamp = tstamp; 149} 150 151#if MACHINE_TIMER_ROUTINES 152 153/* 154 * Machine-dependent code implements the timer event routine. 155 */ 156 157#else /* MACHINE_TIMER_ROUTINES */ 158 159/* 160 * Update the current thread timer and 161 * start the new timer. Requires a current 162 * and new timer. 163 * 164 * Called with interrupts disabled. 165 */ 166void 167thread_timer_event( 168 uint64_t tstamp, 169 timer_t new_timer) 170{ 171 processor_t processor = current_processor(); 172 timer_t timer; 173 174 /* 175 * Update current timer. 176 */ 177 timer = PROCESSOR_DATA(processor, thread_timer); 178 timer_advance(timer, tstamp - timer->tstamp); 179 180 /* 181 * Start new timer. 182 */ 183 PROCESSOR_DATA(processor, thread_timer) = new_timer; 184 new_timer->tstamp = tstamp; 185} 186 187#endif /* MACHINE_TIMER_ROUTINES */ 188