/* * 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. */ /* */ #include <stat_time.h> #include <machine_timer_routines.h> #include <mach/kern_return.h> #include <mach/port.h> #include <kern/queue.h> #include <kern/processor.h> #include <kern/thread.h> #include <kern/sched_prim.h> #include <kern/timer.h> /* * timer_init initializes a timer. */ void timer_init( timer_t timer) { timer->low_bits = 0; timer->high_bits = 0; timer->high_bits_check = 0; #if !STAT_TIME timer->tstamp = 0; #endif /* STAT_TIME */ } /* * Calculate the difference between a timer * and saved value, and update the saved value. */ uint64_t timer_delta( timer_t timer, uint64_t *save) { uint64_t new, old = *save; *save = new = timer_grab(timer); return (new - old); } #if !STAT_TIME /* * Update the current timer (if any) * and start the new timer, which * could be either the same or NULL. * * Called with interrupts disabled. */ void timer_switch( uint32_t tstamp, timer_t new_timer) { processor_t processor = current_processor(); timer_t timer; uint32_t old_low, low; /* * Update current timer. */ timer = PROCESSOR_DATA(processor, current_timer); if (timer != NULL) { old_low = timer->low_bits; low = old_low + tstamp - timer->tstamp; if (low < old_low) timer_update(timer, timer->high_bits + 1, low); else timer->low_bits = low; } /* * Start new timer. */ PROCESSOR_DATA(processor, current_timer) = new_timer; if (new_timer != NULL) new_timer->tstamp = tstamp; } #if MACHINE_TIMER_ROUTINES /* * Machine-dependent code implements the timer event routine. */ #else /* MACHINE_TIMER_ROUTINES */ /* * Update the current timer and start * the new timer. Requires a current * and new timer. * * Called with interrupts disabled. */ void timer_event( uint32_t tstamp, timer_t new_timer) { processor_t processor = current_processor(); timer_t timer; uint32_t old_low, low; /* * Update current timer. */ timer = PROCESSOR_DATA(processor, current_timer); old_low = timer->low_bits; low = old_low + tstamp - timer->tstamp; if (low < old_low) timer_update(timer, timer->high_bits + 1, low); else timer->low_bits = low; /* * Start new timer. */ PROCESSOR_DATA(processor, current_timer) = new_timer; new_timer->tstamp = tstamp; } #endif /* MACHINE_TIMER_ROUTINES */ #endif /* STAT_TIME */