| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * The contents of this file constitute Original Code as defined in and |
| | 7 | * are subject to the Apple Public Source License Version 1.1 (the |
| | 8 | * "License"). You may not use this file except in compliance with the |
| | 9 | * License. Please obtain a copy of the License at |
| | 10 | * http://www.apple.com/publicsource and read it before using this file. |
| | 11 | * |
| | 12 | * This Original Code and all software distributed under the License are |
| | 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| | 17 | * License for the specific language governing rights and limitations |
| | 18 | * under the License. |
| | 19 | * |
| | 20 | * @APPLE_LICENSE_HEADER_END@ |
| | 21 | */ |
| | 22 | /* |
| | 23 | * @OSF_COPYRIGHT@ |
| | 24 | */ |
| | 25 | /* |
| | 26 | * Mach Operating System |
| | 27 | * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University |
| | 28 | * All Rights Reserved. |
| | 29 | * |
| | 30 | * Permission to use, copy, modify and distribute this software and its |
| | 31 | * documentation is hereby granted, provided that both the copyright |
| | 32 | * notice and this permission notice appear in all copies of the |
| | 33 | * software, derivative works or modified versions, and any portions |
| | 34 | * thereof, and that both notices appear in supporting documentation. |
| | 35 | * |
| | 36 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| | 37 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| | 38 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| | 39 | * |
| | 40 | * Carnegie Mellon requests users of this software to return to |
| | 41 | * |
| | 42 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| | 43 | * School of Computer Science |
| | 44 | * Carnegie Mellon University |
| | 45 | * Pittsburgh PA 15213-3890 |
| | 46 | * |
| | 47 | * any improvements or extensions that they make and grant Carnegie Mellon |
| | 48 | * the rights to redistribute these changes. |
| | 49 | */ |
| | 50 | /* |
| | 51 | */ |
| | 52 | |
| | 53 | #ifndef _KERN_TIMER_H_ |
| | 54 | #define _KERN_TIMER_H_ |
| | 55 | |
| | 56 | #include <stat_time.h> |
| | 57 | |
| | 58 | #include <kern/kern_types.h> |
| | 59 | |
| | 60 | /* |
| | 61 | * Definitions for high resolution timers. A check |
| | 62 | * word on the high portion allows atomic updates. |
| | 63 | */ |
| | 64 | |
| | 65 | struct timer { |
| | 66 | uint32_t low_bits; |
| | 67 | uint32_t high_bits; |
| | 68 | uint32_t high_bits_check; |
| | 69 | #if !STAT_TIME |
| | 70 | uint32_t tstamp; |
| | 71 | #endif /* STAT_TIME */ |
| | 72 | }; |
| | 73 | |
| | 74 | typedef struct timer timer_data_t, *timer_t; |
| | 75 | |
| | 76 | /* |
| | 77 | * Exported kernel interface to timers |
| | 78 | */ |
| | 79 | |
| | 80 | #if STAT_TIME |
| | 81 | |
| | 82 | #include <kern/macro_help.h> |
| | 83 | |
| | 84 | /* Advance a timer by the specified amount */ |
| | 85 | #define TIMER_BUMP(timer, ticks) \ |
| | 86 | MACRO_BEGIN \ |
| | 87 | uint32_t old_low, low; \ |
| | 88 | \ |
| | 89 | old_low = (timer)->low_bits; \ |
| | 90 | low = old_low + (ticks); \ |
| | 91 | if (low < old_low) \ |
| | 92 | timer_update((timer), (timer)->high_bits + 1, low); \ |
| | 93 | else \ |
| | 94 | (timer)->low_bits = low; \ |
| | 95 | MACRO_END |
| | 96 | |
| | 97 | #define timer_switch(tstamp, new_timer) |
| | 98 | #define timer_event(tstamp, new_timer) |
| | 99 | |
| | 100 | #else /* STAT_TIME */ |
| | 101 | |
| | 102 | /* Update the current timer and start a new one */ |
| | 103 | extern void timer_switch( |
| | 104 | uint32_t tstamp, |
| | 105 | timer_t new_timer); |
| | 106 | |
| | 107 | #define TIMER_BUMP(timer, ticks) |
| | 108 | |
| | 109 | #endif /* STAT_TIME */ |
| | 110 | |
| | 111 | /* Initialize a timer */ |
| | 112 | extern void timer_init( |
| | 113 | timer_t timer); |
| | 114 | |
| | 115 | /* Update a saved timer value and return delta to current value */ |
| | 116 | extern uint64_t timer_delta( |
| | 117 | timer_t timer, |
| | 118 | uint64_t *save); |
| | 119 | |
| | 120 | /* |
| | 121 | * Exported hardware interface to timers |
| | 122 | */ |
| | 123 | |
| | 124 | /* Read timer value */ |
| | 125 | extern uint64_t timer_grab( |
| | 126 | timer_t timer); |
| | 127 | |
| | 128 | /* Update timer value */ |
| | 129 | extern void timer_update( |
| | 130 | timer_t timer, |
| | 131 | uint32_t new_high, |
| | 132 | uint32_t new_low); |
| | 133 | |
| | 134 | #if !STAT_TIME |
| | 135 | |
| | 136 | /* Update the current timer at an event */ |
| | 137 | extern void timer_event( |
| | 138 | uint32_t tstamp, |
| | 139 | timer_t new_timer); |
| | 140 | |
| | 141 | #endif /* STAT_TIME */ |
| | 142 | |
| | 143 | #endif /* _KERN_TIMER_H_ */ |
projects / apple / xnu.git / blame_incremental