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 69#if CONFIG_EMBEDDED 70int precise_user_kernel_time = 0; 71#else 72int precise_user_kernel_time = 1; 73#endif 74 75/* 76 * timer_init initializes a timer. 77 */ 78void 79timer_init( 80 timer_t timer) 81{ 82 timer->tstamp = 0; 83#if defined(__LP64__) 84 timer->all_bits = 0; 85#else 86 timer->low_bits = 0; 87 timer->high_bits = 0; 88 timer->high_bits_check = 0; 89#endif /* defined(__LP64__) */ 90} 91 92/* 93 * Calculate the difference between a timer 94 * and saved value, and update the saved value. 95 */ 96uint64_t 97timer_delta( 98 timer_t timer, 99 uint64_t *save) 100{ 101 uint64_t new, old = *save; 102 103 *save = new = timer_grab(timer); 104 105 return (new - old); 106} 107 108void 109timer_advance( 110 timer_t timer, 111 uint64_t delta) 112{ 113#if defined(__LP64__) 114 timer->all_bits += delta; 115#else 116 uint64_t low; 117 118 low = delta + timer->low_bits; 119 if (low >> 32) 120 timer_update(timer, (uint32_t)(timer->high_bits + (low >> 32)), (uint32_t)low); 121 else 122 timer->low_bits = (uint32_t)low; 123#endif /* defined(__LP64__) */ 124} 125 126void 127timer_start( 128 timer_t timer, 129 uint64_t tstamp) 130{ 131 timer->tstamp = tstamp; 132} 133 134void 135timer_stop( 136 timer_t timer, 137 uint64_t tstamp) 138{ 139 timer_advance(timer, tstamp - timer->tstamp); 140} 141 142/* 143 * Update the timer and start a new one. 144 */ 145void 146timer_switch( 147 timer_t timer, 148 uint64_t tstamp, 149 timer_t new_timer) 150{ 151 timer_advance(timer, tstamp - timer->tstamp); 152 new_timer->tstamp = tstamp; 153} 154 155#if MACHINE_TIMER_ROUTINES 156 157/* 158 * Machine-dependent code implements the timer event routine. 159 */ 160 161#else /* MACHINE_TIMER_ROUTINES */ 162 163/* 164 * Update the current thread timer and 165 * start the new timer. Requires a current 166 * and new timer. 167 * 168 * Called with interrupts disabled. 169 */ 170void 171thread_timer_event( 172 uint64_t tstamp, 173 timer_t new_timer) 174{ 175 processor_t processor = current_processor(); 176 timer_t timer; 177 178 /* 179 * Update current timer. 180 */ 181 timer = PROCESSOR_DATA(processor, thread_timer); 182 timer_advance(timer, tstamp - timer->tstamp); 183 184 /* 185 * Start new timer. 186 */ 187 PROCESSOR_DATA(processor, thread_timer) = new_timer; 188 new_timer->tstamp = tstamp; 189} 190 191#endif /* MACHINE_TIMER_ROUTINES */ 192