/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2018 Apple 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
+ * @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 OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * 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 <stat_time.h>
-#include <machine_timer_routines.h>
#include <mach/kern_return.h>
#include <mach/port.h>
#include <kern/sched_prim.h>
#include <kern/timer.h>
-/*
- * timer_init initializes a timer.
- */
+#include <machine/config.h>
+
+#if CONFIG_SKIP_PRECISE_USER_KERNEL_TIME && !HAS_FAST_CNTVCT
+int precise_user_kernel_time = 0;
+#else
+int precise_user_kernel_time = 1;
+#endif
+
void
-timer_init(
- timer_t timer)
+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 */
+ memset(timer, 0, sizeof(*timer));
}
-/*
- * Calculate the difference between a timer
- * and saved value, and update the saved value.
- */
uint64_t
-timer_delta(
- timer_t timer,
- uint64_t *save)
+timer_delta(timer_t timer, uint64_t *prev_in_cur_out)
{
- uint64_t new, old = *save;
-
- *save = new = timer_grab(timer);
-
- return (new - old);
+ uint64_t old = *prev_in_cur_out;
+ uint64_t new = *prev_in_cur_out = 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)
+static void
+timer_advance(timer_t timer, uint64_t delta)
{
- 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;
+#if defined(__LP64__)
+ timer->all_bits += delta;
+#else /* defined(__LP64__) */
+ extern void timer_advance_internal_32(timer_t timer, uint32_t high,
+ uint32_t low);
+ uint64_t low = delta + timer->low_bits;
+ if (low >> 32) {
+ timer_advance_internal_32(timer,
+ (uint32_t)(timer->high_bits + (low >> 32)), (uint32_t)low);
+ } else {
+ timer->low_bits = (uint32_t)low;
}
+#endif /* defined(__LP64__) */
+}
- /*
- * Start new timer.
- */
- PROCESSOR_DATA(processor, current_timer) = new_timer;
- if (new_timer != NULL)
- new_timer->tstamp = tstamp;
+void
+timer_start(timer_t timer, uint64_t tstamp)
+{
+ timer->tstamp = tstamp;
}
-#if MACHINE_TIMER_ROUTINES
+void
+timer_stop(timer_t timer, uint64_t tstamp)
+{
+ timer_advance(timer, tstamp - timer->tstamp);
+}
-/*
- * Machine-dependent code implements the timer event routine.
- */
+void
+timer_update(timer_t timer, uint64_t tstamp)
+{
+ timer_advance(timer, tstamp - timer->tstamp);
+ timer->tstamp = tstamp;
+}
-#else /* MACHINE_TIMER_ROUTINES */
+void
+timer_switch(timer_t timer, uint64_t tstamp, timer_t new_timer)
+{
+ timer_advance(timer, tstamp - timer->tstamp);
+ new_timer->tstamp = tstamp;
+}
/*
- * Update the current timer and start
- * the new timer. Requires a current
- * and new timer.
+ * Update the current processor's thread timer with `tstamp` and switch the
+ * processor's thread timer to `new_timer`.
*
- * Called with interrupts disabled.
+ * Called with interrupts disabled.
*/
void
-timer_event(
- uint32_t tstamp,
- timer_t new_timer)
+processor_timer_switch_thread(uint64_t tstamp, timer_t new_timer)
{
- processor_t processor = current_processor();
- timer_t timer;
- uint32_t old_low, low;
+ processor_t processor = current_processor();
+ timer_t timer;
- /*
- * 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;
+ /* Update current timer. */
+ timer = processor->thread_timer;
+ timer_advance(timer, tstamp - timer->tstamp);
- /*
- * Start new timer.
- */
- PROCESSOR_DATA(processor, current_timer) = new_timer;
+ /* Start new timer. */
+ processor->thread_timer = new_timer;
new_timer->tstamp = tstamp;
}
-
-#endif /* MACHINE_TIMER_ROUTINES */
-
-#endif /* STAT_TIME */
projects / apple / xnu.git / blobdiff