/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_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 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.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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.
+ * 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_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
#ifndef _KERN_TIMER_H_
#define _KERN_TIMER_H_
-#include <stat_time.h>
-
#include <kern/kern_types.h>
+/*
+ * Some platforms have very expensive timebase routines. An optimization
+ * is to avoid switching timers on kernel exit/entry, which results in all
+ * time billed to the system timer. However, when exposed to userspace,
+ * we report as user time to indicate that work was done on behalf of
+ * userspace.
+ *
+ * Although this policy is implemented as a global variable, we snapshot it
+ * at key points in the thread structure (when the thread is locked and
+ * executing in the kernel) to avoid imbalances.
+ */
+extern int precise_user_kernel_time;
+
+/*
+ * thread must be locked, or be the current executing thread, so that
+ * it doesn't transition from user to kernel while updating the
+ * thread-local value (or in kernel debugger context). In the future,
+ * we make take into account task-level or thread-level policy.
+ */
+#define use_precise_user_kernel_time(thread) ( precise_user_kernel_time )
+
/*
* Definitions for high resolution timers. A check
* word on the high portion allows atomic updates.
*/
struct timer {
+ uint64_t tstamp;
+#if defined(__LP64__)
+ uint64_t all_bits;
+#else
uint32_t low_bits;
uint32_t high_bits;
uint32_t high_bits_check;
-#if !STAT_TIME
- uint32_t tstamp;
-#endif /* STAT_TIME */
+#endif
};
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)
+/* Start a timer by setting the timestamp */
+extern void timer_start(
+ timer_t timer,
+ uint64_t tstamp);
-#else /* STAT_TIME */
+/* Stop a timer by updating from the timestamp */
+extern void timer_stop(
+ timer_t timer,
+ uint64_t tstamp);
-/* Update the current timer and start a new one */
+/* Update the timer and start a new one */
extern void timer_switch(
- uint32_t tstamp,
+ timer_t timer,
+ uint64_t tstamp,
timer_t new_timer);
-#define TIMER_BUMP(timer, ticks)
-
-#endif /* STAT_TIME */
+/* Update the thread timer at an event */
+extern void thread_timer_event(
+ uint64_t tstamp,
+ timer_t new_timer);
/* Initialize a timer */
extern void timer_init(
timer_t timer,
uint64_t *save);
+/* Advance a timer by a 64 bit value */
+extern void timer_advance(
+ timer_t timer,
+ uint64_t delta);
+
/*
* Exported hardware interface to timers
*/
/* Read timer value */
+#if defined(__LP64__)
+static inline uint64_t timer_grab(
+ timer_t timer)
+{
+ return timer->all_bits;
+}
+#else
extern uint64_t timer_grab(
timer_t timer);
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 /* defined(__LP64__) */
#endif /* _KERN_TIMER_H_ */
projects / apple / xnu.git / blobdiff