xnu-1228.3.13.tar.gz

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

diff --git a/osfmk/kern/timer.c b/osfmk/kern/timer.c
index 4dc36f6b5035aa375f3ace087f9e0810f7312f2d..b53419857ecfce18f4624962c99013e84d818974 100644 (file)
--- a/osfmk/kern/timer.c
+++ b/osfmk/kern/timer.c
@@ -1,23 +1,29 @@
 /*
- * 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@
@@ -68,12 +74,12 @@ 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 */
+       timer->low_bits = 0;
+       timer->high_bits = 0;
+       timer->high_bits_check = 0;
 }
 
 /*
@@ -92,43 +98,49 @@ timer_delta(
        return (new - old);
 }
 
+void
+timer_advance(
+       timer_t         timer,
+       uint64_t        delta)
+{
+       uint64_t        low;
+
+       low = delta + timer->low_bits;
+       if (low >> 32)
+               timer_update(timer, timer->high_bits + (low >> 32), low);
+       else
+               timer->low_bits = low;
+}
+
 #if    !STAT_TIME
 
+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 current timer (if any)
- *     and start the new timer, which
- *     could be either the same or NULL.
- *
- *     Called with interrupts disabled.
+ *     Update the timer and start a new one.
  */
 void
 timer_switch(
-       uint32_t                tstamp,
+       timer_t                 timer,
+       uint64_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;
+       timer_advance(timer, tstamp - timer->tstamp);
+       new_timer->tstamp = tstamp;
 }
 
 #if    MACHINE_TIMER_ROUTINES
@@ -140,36 +152,30 @@ timer_switch(
 #else  /* MACHINE_TIMER_ROUTINES */
 
 /*
- *     Update the current timer and start
- *     the new timer.  Requires a current
+ *     Update the current thread timer and
+ *     start the new timer.  Requires a current
  *     and new timer.
  *
  *     Called with interrupts disabled.
  */
 void
-timer_event(
-       uint32_t                tstamp,
+thread_timer_event(
+       uint64_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;
+       timer = PROCESSOR_DATA(processor, thread_timer);
+       timer_advance(timer, tstamp - timer->tstamp);
 
        /*
         *      Start new timer.
         */
-       PROCESSOR_DATA(processor, current_timer) = new_timer;
+       PROCESSOR_DATA(processor, thread_timer) = new_timer;
        new_timer->tstamp = tstamp;
 }