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 <mach/kern_return.h> 60#include <mach/port.h> 61#include <kern/queue.h> 62#include <kern/processor.h> 63#include <kern/thread.h> 64#include <kern/sched_prim.h> 65#include <kern/timer.h> 66 67int precise_user_kernel_time = 1; 68 69/* 70 * timer_init initializes a timer. 71 */ 72void 73timer_init( 74 timer_t timer) 75{ 76 timer->tstamp = 0; 77#if defined(__LP64__) 78 timer->all_bits = 0; 79#else 80 timer->low_bits = 0; 81 timer->high_bits = 0; 82 timer->high_bits_check = 0; 83#endif /* defined(__LP64__) */ 84} 85 86/* 87 * Calculate the difference between a timer 88 * and saved value, and update the saved value. 89 */ 90uint64_t 91timer_delta( 92 timer_t timer, 93 uint64_t *save) 94{ 95 uint64_t new, old = *save; 96 97 *save = new = timer_grab(timer); 98 99 return (new - old); 100} 101 102void 103timer_advance( 104 timer_t timer, 105 uint64_t delta) 106{ 107#if defined(__LP64__) 108 timer->all_bits += delta; 109#else 110 uint64_t low; 111 112 low = delta + timer->low_bits; 113 if (low >> 32) 114 timer_update(timer, (uint32_t)(timer->high_bits + (low >> 32)), (uint32_t)low); 115 else 116 timer->low_bits = (uint32_t)low; 117#endif /* defined(__LP64__) */ 118} 119 120void 121timer_start( 122 timer_t timer, 123 uint64_t tstamp) 124{ 125 timer->tstamp = tstamp; 126} 127 128void 129timer_stop( 130 timer_t timer, 131 uint64_t tstamp) 132{ 133 timer_advance(timer, tstamp - timer->tstamp); 134} 135 136/* 137 * Update the timer and start a new one. 138 */ 139void 140timer_switch( 141 timer_t timer, 142 uint64_t tstamp, 143 timer_t new_timer) 144{ 145 timer_advance(timer, tstamp - timer->tstamp); 146 new_timer->tstamp = tstamp; 147} 148 149/* 150 * Update the current thread timer and 151 * start the new timer. Requires a current 152 * and new timer. 153 * 154 * Called with interrupts disabled. 155 */ 156void 157thread_timer_event( 158 uint64_t tstamp, 159 timer_t new_timer) 160{ 161 processor_t processor = current_processor(); 162 timer_t timer; 163 164 /* 165 * Update current timer. 166 */ 167 timer = PROCESSOR_DATA(processor, thread_timer); 168 timer_advance(timer, tstamp - timer->tstamp); 169 170 /* 171 * Start new timer. 172 */ 173 PROCESSOR_DATA(processor, thread_timer) = new_timer; 174 new_timer->tstamp = tstamp; 175} 176