| 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 | |
| 67 | int precise_user_kernel_time = 1; |
| 68 | |
| 69 | /* |
| 70 | * timer_init initializes a timer. |
| 71 | */ |
| 72 | void |
| 73 | timer_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 | */ |
| 90 | uint64_t |
| 91 | timer_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 | |
| 102 | void |
| 103 | timer_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 | |
| 120 | void |
| 121 | timer_start( |
| 122 | timer_t timer, |
| 123 | uint64_t tstamp) |
| 124 | { |
| 125 | timer->tstamp = tstamp; |
| 126 | } |
| 127 | |
| 128 | void |
| 129 | timer_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 | */ |
| 139 | void |
| 140 | timer_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 | */ |
| 156 | void |
| 157 | thread_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 | } |