/* * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_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 <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> #if CONFIG_EMBEDDED int precise_user_kernel_time = 0; #else int precise_user_kernel_time = 1; #endif /* * timer_init initializes a timer. */ void timer_init( timer_t timer) { timer->tstamp = 0; #if defined(__LP64__) timer->all_bits = 0; #else timer->low_bits = 0; timer->high_bits = 0; timer->high_bits_check = 0; #endif /* defined(__LP64__) */ } /* * 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); } void timer_advance( timer_t timer, uint64_t delta) { #if defined(__LP64__) timer->all_bits += delta; #else uint64_t low; low = delta + timer->low_bits; if (low >> 32) timer_update(timer, (uint32_t)(timer->high_bits + (low >> 32)), (uint32_t)low); else timer->low_bits = (uint32_t)low; #endif /* defined(__LP64__) */ } void timer_start( timer_t timer, uint64_t tstamp) { timer->tstamp = tstamp; } void timer_stop( timer_t timer, uint64_t tstamp) { timer_advance(timer, tstamp - timer->tstamp); } /* * Update the timer and start a new one. */ void timer_switch( timer_t timer, uint64_t tstamp, timer_t new_timer) { timer_advance(timer, tstamp - timer->tstamp); new_timer->tstamp = tstamp; } #if MACHINE_TIMER_ROUTINES /* * Machine-dependent code implements the timer event routine. */ #else /* MACHINE_TIMER_ROUTINES */ /* * Update the current thread timer and * start the new timer. Requires a current * and new timer. * * Called with interrupts disabled. */ void thread_timer_event( uint64_t tstamp, timer_t new_timer) { processor_t processor = current_processor(); timer_t timer; /* * Update current timer. */ timer = PROCESSOR_DATA(processor, thread_timer); timer_advance(timer, tstamp - timer->tstamp); /* * Start new timer. */ PROCESSOR_DATA(processor, thread_timer) = new_timer; new_timer->tstamp = tstamp; } #endif /* MACHINE_TIMER_ROUTINES */