xnu-4903.221.2.tar.gz

[apple/xnu.git] / osfmk / kern / timer.c

diff --git a/osfmk/kern/timer.c b/osfmk/kern/timer.c
index 4dc36f6b5035aa375f3ace087f9e0810f7312f2d..8ccba9e2cd6429be742d68bfd7ce92c5f5360abf 100644 (file)
--- a/osfmk/kern/timer.c
+++ b/osfmk/kern/timer.c
@@ -1,57 +1,58 @@
 /*
 /*

- * 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,
  * 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@
  */
  */
 /*
  * @OSF_COPYRIGHT@
  */

-/* 
+/*

  * Mach Operating System
  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  * All Rights Reserved.
  * 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.
  * 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 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
  * 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
  *  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.
  */
  * 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 <mach/kern_return.h>
 #include <mach/port.h>


@@ -61,118 +62,87 @@
 #include <kern/sched_prim.h>
 #include <kern/timer.h>
 
 #include <kern/sched_prim.h>
 #include <kern/timer.h>
 

-/*
- *     timer_init initializes a timer.
- */
+#if CONFIG_EMBEDDED
+int precise_user_kernel_time = 0;
+#else
+int precise_user_kernel_time = 1;
+#endif
+

 void
 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
 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);
-
+       uint64_t old = *prev_in_cur_out;
+       uint64_t new = *prev_in_cur_out = timer_grab(timer);

        return (new - old);
 }
 
        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
  */
 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_DATA(processor, thread_timer);
+       timer_advance(timer, tstamp - timer->tstamp);

 
 

-       /*
-        *      Start new timer.
-        */
-       PROCESSOR_DATA(processor, current_timer) = new_timer;
+       /* Start new timer. */
+       PROCESSOR_DATA(processor, thread_timer) = new_timer;

        new_timer->tstamp = tstamp;
 }
        new_timer->tstamp = tstamp;
 }

-
-#endif /* MACHINE_TIMER_ROUTINES */
-
-#endif /* STAT_TIME */