/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* */ #ifndef _KERN_TIMER_H_ #define _KERN_TIMER_H_ #include <stat_time.h> #include <kern/kern_types.h> /* * Definitions for high resolution timers. A check * word on the high portion allows atomic updates. */ struct timer { uint32_t low_bits; uint32_t high_bits; uint32_t high_bits_check; #if !STAT_TIME uint32_t tstamp; #endif /* STAT_TIME */ }; typedef struct timer timer_data_t, *timer_t; /* * Exported kernel interface to timers */ #if STAT_TIME #include <kern/macro_help.h> /* Advance a timer by the specified amount */ #define TIMER_BUMP(timer, ticks) \ MACRO_BEGIN \ uint32_t old_low, low; \ \ old_low = (timer)->low_bits; \ low = old_low + (ticks); \ if (low < old_low) \ timer_update((timer), (timer)->high_bits + 1, low); \ else \ (timer)->low_bits = low; \ MACRO_END #define timer_switch(tstamp, new_timer) #define timer_event(tstamp, new_timer) #else /* STAT_TIME */ /* Update the current timer and start a new one */ extern void timer_switch( uint32_t tstamp, timer_t new_timer); #define TIMER_BUMP(timer, ticks) #endif /* STAT_TIME */ /* Initialize a timer */ extern void timer_init( timer_t timer); /* Update a saved timer value and return delta to current value */ extern uint64_t timer_delta( timer_t timer, uint64_t *save); /* * Exported hardware interface to timers */ /* Read timer value */ extern uint64_t timer_grab( timer_t timer); /* Update timer value */ extern void timer_update( timer_t timer, uint32_t new_high, uint32_t new_low); #if !STAT_TIME /* Update the current timer at an event */ extern void timer_event( uint32_t tstamp, timer_t new_timer); #endif /* STAT_TIME */ #endif /* _KERN_TIMER_H_ */