*
* @APPLE_LICENSE_HEADER_START@
*
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
- *
* 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
/*
*/
-#include <cpus.h>
#include <stat_time.h>
+#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 <mach/time_value.h>
#include <kern/timer.h>
-#include <kern/cpu_number.h>
-
-#include <kern/assert.h>
-#include <kern/macro_help.h>
-
-timer_t current_timer[NCPUS];
-timer_data_t kernel_timer[NCPUS];
-
-/* Forwards */
-void timer_grab(
- timer_t timer,
- timer_save_t save);
-
-void db_timer_grab(
- timer_t timer,
- timer_save_t save);
-
-void db_thread_read_times(
- thread_t thread,
- time_value_t *user_time_p,
- time_value_t *system_time_p);
/*
- * init_timers initializes all non-thread timers and puts the
- * service routine on the callout queue. All timers must be
- * serviced by the callout routine once an hour.
- */
-void
-init_timers(void)
-{
- register int i;
- register timer_t this_timer;
-
- /*
- * Initialize all the kernel timers and start the one
- * for this cpu (master) slaves start theirs later.
- */
- this_timer = &kernel_timer[0];
- for ( i=0 ; i<NCPUS ; i++, this_timer++) {
- timer_init(this_timer);
- current_timer[i] = (timer_t) 0;
- }
-
- mp_disable_preemption();
- start_timer(&kernel_timer[cpu_number()]);
- mp_enable_preemption();
-}
-
-/*
- * timer_init initializes a single timer.
+ * timer_init initializes a timer.
*/
void
timer_init(
- register timer_t this_timer)
+ timer_t timer)
{
- this_timer->low_bits = 0;
- this_timer->high_bits = 0;
- this_timer->tstamp = 0;
- this_timer->high_bits_check = 0;
-}
-
-#if STAT_TIME
-#else /* STAT_TIME */
-
-#ifdef MACHINE_TIMER_ROUTINES
-
-/*
- * Machine-dependent code implements the timer routines.
- */
-
-#else /* MACHINE_TIMER_ROUTINES */
-
-/*
- * start_timer starts the given timer for this cpu. It is called
- * exactly once for each cpu during the boot sequence.
- */
-void
-start_timer(
- register timer_t timer)
-{
- timer->tstamp = get_timestamp();
- mp_disable_preemption();
- current_timer[cpu_number()] = timer;
- mp_enable_preemption();
-}
-
-/*
- * time_trap_uentry does trap entry timing. Caller must lock out
- * interrupts and take a timestamp. ts is a timestamp taken after
- * interrupts were locked out. Must only be called if trap was
- * from user mode.
- */
-void
-time_trap_uentry(
- unsigned ts)
-{
- int elapsed;
- int mycpu;
- timer_t mytimer;
-
- mp_disable_preemption();
-
- /*
- * Calculate elapsed time.
- */
- mycpu = cpu_number();
- mytimer = current_timer[mycpu];
- elapsed = ts - mytimer->tstamp;
-#ifdef TIMER_MAX
- if (elapsed < 0) elapsed += TIMER_MAX;
-#endif /* TIMER_MAX */
-
- /*
- * Update current timer.
- */
- mytimer->low_bits += elapsed;
- mytimer->tstamp = 0;
-
- if (mytimer->low_bits & TIMER_LOW_FULL) {
- timer_normalize(mytimer);
- }
-
- /*
- * Record new timer.
- */
- mytimer = &(current_thread()->system_timer);
- current_timer[mycpu] = mytimer;
- mytimer->tstamp = ts;
-
- mp_enable_preemption();
+ timer->low_bits = 0;
+ timer->high_bits = 0;
+ timer->high_bits_check = 0;
+#if !STAT_TIME
+ timer->tstamp = 0;
+#endif /* STAT_TIME */
}
/*
- * time_trap_uexit does trap exit timing. Caller must lock out
- * interrupts and take a timestamp. ts is a timestamp taken after
- * interrupts were locked out. Must only be called if returning to
- * user mode.
+ * Calculate the difference between a timer
+ * and saved value, and update the saved value.
*/
-void
-time_trap_uexit(
- unsigned ts)
+uint64_t
+timer_delta(
+ timer_t timer,
+ uint64_t *save)
{
- int elapsed;
- int mycpu;
- timer_t mytimer;
+ uint64_t new, old = *save;
- mp_disable_preemption();
-
- /*
- * Calculate elapsed time.
- */
- mycpu = cpu_number();
- mytimer = current_timer[mycpu];
- elapsed = ts - mytimer->tstamp;
-#ifdef TIMER_MAX
- if (elapsed < 0) elapsed += TIMER_MAX;
-#endif /* TIMER_MAX */
+ *save = new = timer_grab(timer);
- /*
- * Update current timer.
- */
- mytimer->low_bits += elapsed;
- mytimer->tstamp = 0;
-
- if (mytimer->low_bits & TIMER_LOW_FULL) {
- timer_normalize(mytimer); /* SYSTEMMODE */
- }
-
- mytimer = &(current_thread()->user_timer);
-
- /*
- * Record new timer.
- */
- current_timer[mycpu] = mytimer;
- mytimer->tstamp = ts;
-
- mp_enable_preemption();
+ return (new - old);
}
-/*
- * time_int_entry does interrupt entry timing. Caller must lock out
- * interrupts and take a timestamp. ts is a timestamp taken after
- * interrupts were locked out. new_timer is the new timer to
- * switch to. This routine returns the currently running timer,
- * which MUST be pushed onto the stack by the caller, or otherwise
- * saved for time_int_exit.
- */
-timer_t
-time_int_entry(
- unsigned ts,
- timer_t new_timer)
-{
- int elapsed;
- int mycpu;
- timer_t mytimer;
-
- mp_disable_preemption();
-
- /*
- * Calculate elapsed time.
- */
- mycpu = cpu_number();
- mytimer = current_timer[mycpu];
-
- elapsed = ts - mytimer->tstamp;
-#ifdef TIMER_MAX
- if (elapsed < 0) elapsed += TIMER_MAX;
-#endif /* TIMER_MAX */
-
- /*
- * Update current timer.
- */
- mytimer->low_bits += elapsed;
- mytimer->tstamp = 0;
-
- /*
- * Switch to new timer, and save old one on stack.
- */
- new_timer->tstamp = ts;
- current_timer[mycpu] = new_timer;
-
- mp_enable_preemption();
-
- return(mytimer);
-}
+#if !STAT_TIME
/*
- * time_int_exit does interrupt exit timing. Caller must lock out
- * interrupts and take a timestamp. ts is a timestamp taken after
- * interrupts were locked out. old_timer is the timer value pushed
- * onto the stack or otherwise saved after time_int_entry returned
- * it.
- */
-void
-time_int_exit(
- unsigned ts,
- timer_t old_timer)
-{
- int elapsed;
- int mycpu;
- timer_t mytimer;
-
- mp_disable_preemption();
-
- /*
- * Calculate elapsed time.
- */
- mycpu = cpu_number();
- mytimer = current_timer[mycpu];
- elapsed = ts - mytimer->tstamp;
-#ifdef TIMER_MAX
- if (elapsed < 0) elapsed += TIMER_MAX;
-#endif /* TIMER_MAX */
-
- /*
- * Update current timer.
- */
- mytimer->low_bits += elapsed;
- mytimer->tstamp = 0;
-
- /*
- * If normalization requested, do it.
- */
- if (mytimer->low_bits & TIMER_LOW_FULL) {
- timer_normalize(mytimer);
- }
- if (old_timer->low_bits & TIMER_LOW_FULL) {
- timer_normalize(old_timer);
- }
-
- /*
- * Start timer that was running before interrupt.
- */
- old_timer->tstamp = ts;
- current_timer[mycpu] = old_timer;
-
- mp_enable_preemption();
-}
-
-/*
- * timer_switch switches to a new timer. The machine
- * dependent routine/macro get_timestamp must return a timestamp.
- * Caller must lock out interrupts.
+ * 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(
- timer_t new_timer)
+ uint32_t tstamp,
+ timer_t new_timer)
{
- int elapsed;
- int mycpu;
- timer_t mytimer;
- unsigned ts;
-
- mp_disable_preemption();
-
- /*
- * Calculate elapsed time.
- */
- mycpu = cpu_number();
- mytimer = current_timer[mycpu];
- ts = get_timestamp();
- elapsed = ts - mytimer->tstamp;
-#ifdef TIMER_MAX
- if (elapsed < 0) elapsed += TIMER_MAX;
-#endif /* TIMER_MAX */
+ processor_t processor = current_processor();
+ timer_t timer;
+ uint32_t old_low, low;
/*
* Update current timer.
*/
- mytimer->low_bits += elapsed;
- mytimer->tstamp = 0;
-
- /*
- * Normalization check
- */
- if (mytimer->low_bits & TIMER_LOW_FULL) {
- timer_normalize(mytimer);
+ 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;
}
/*
- * Record new timer.
+ * Start new timer.
*/
- current_timer[mycpu] = new_timer;
- new_timer->tstamp = ts;
-
- mp_enable_preemption();
+ PROCESSOR_DATA(processor, current_timer) = new_timer;
+ if (new_timer != NULL)
+ new_timer->tstamp = tstamp;
}
-#endif /* MACHINE_TIMER_ROUTINES */
-#endif /* STAT_TIME */
+#if MACHINE_TIMER_ROUTINES
/*
- * timer_normalize normalizes the value of a timer. It is
- * called only rarely, to make sure low_bits never overflows.
+ * Machine-dependent code implements the timer event routine.
*/
-void
-timer_normalize(
- register timer_t timer)
-{
- unsigned int high_increment;
-
- /*
- * Calculate high_increment, then write high check field first
- * followed by low and high. timer_grab() reads these fields in
- * reverse order so if high and high check match, we know
- * that the values read are ok.
- */
-
- high_increment = timer->low_bits/TIMER_HIGH_UNIT;
- timer->high_bits_check += high_increment;
- timer->low_bits %= TIMER_HIGH_UNIT;
- timer->high_bits += high_increment;
-}
+#else /* MACHINE_TIMER_ROUTINES */
/*
- * timer_grab() retrieves the value of a timer.
+ * Update the current timer and start
+ * the new timer. Requires a current
+ * and new timer.
*
- * Critical scheduling code uses TIMER_DELTA macro in timer.h
- * (called from thread_timer_delta in sched.h).
- *
- * Keep coherent with db_time_grab below.
+ * Called with interrupts disabled.
*/
-
void
-timer_grab(
- timer_t timer,
- timer_save_t save)
+timer_event(
+ uint32_t tstamp,
+ timer_t new_timer)
{
-#if MACH_ASSERT
- unsigned int passes=0;
-#endif
- do {
- (save)->high = (timer)->high_bits;
- (save)->low = (timer)->low_bits;
+ processor_t processor = current_processor();
+ timer_t timer;
+ uint32_t old_low, low;
+
/*
- * If the timer was normalized while we were doing this,
- * the high_bits value read above and the high_bits check
- * value will not match because high_bits_check is the first
- * field touched by the normalization procedure, and
- * high_bits is the last.
- *
- * Additions to timer only touch low bits and
- * are therefore atomic with respect to this.
+ * Update current timer.
*/
-#if MACH_ASSERT
- passes++;
- assert(passes < 10000);
-#endif
- } while ( (save)->high != (timer)->high_bits_check);
-}
+ 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;
-/*
- *
- * Db_timer_grab(): used by db_thread_read_times. An nonblocking
- * version of db_thread_get_times. Keep coherent with timer_grab
- * above.
- *
- */
-void
-db_timer_grab(
- timer_t timer,
- timer_save_t save)
-{
- /* Don't worry about coherency */
-
- (save)->high = (timer)->high_bits;
- (save)->low = (timer)->low_bits;
-}
-
-
-/*
- * timer_read reads the value of a timer into a time_value_t. If the
- * timer was modified during the read, retry. The value returned
- * is accurate to the last update; time accumulated by a running
- * timer since its last timestamp is not included.
- */
-
-void
-timer_read(
- timer_t timer,
- register time_value_t *tv)
-{
- timer_save_data_t temp;
-
- timer_grab(timer,&temp);
/*
- * Normalize the result
+ * Start new timer.
*/
-#ifdef TIMER_ADJUST
- TIMER_ADJUST(&temp);
-#endif /* TIMER_ADJUST */
- tv->seconds = temp.high + temp.low/1000000;
- tv->microseconds = temp.low%1000000;
-}
-
-/*
- * thread_read_times reads the user and system times from a thread.
- * Time accumulated since last timestamp is not included. Should
- * be called at splsched() to avoid having user and system times
- * be out of step. Doesn't care if caller locked thread.
- *
- * Needs to be kept coherent with thread_read_times ahead.
- */
-void
-thread_read_times(
- thread_t thread,
- time_value_t *user_time_p,
- time_value_t *system_time_p)
-{
- timer_save_data_t temp;
- register timer_t timer;
-
- timer = &thread->user_timer;
- timer_grab(timer, &temp);
-
-#ifdef TIMER_ADJUST
- TIMER_ADJUST(&temp);
-#endif /* TIMER_ADJUST */
- user_time_p->seconds = temp.high + temp.low/1000000;
- user_time_p->microseconds = temp.low % 1000000;
-
- timer = &thread->system_timer;
- timer_grab(timer, &temp);
-
-#ifdef TIMER_ADJUST
- TIMER_ADJUST(&temp);
-#endif /* TIMER_ADJUST */
- system_time_p->seconds = temp.high + temp.low/1000000;
- system_time_p->microseconds = temp.low % 1000000;
-}
-
-/*
- * Db_thread_read_times: A version of thread_read_times that
- * can be called by the debugger. This version does not call
- * timer_grab, which can block. Please keep it up to date with
- * thread_read_times above.
- *
- */
-void
-db_thread_read_times(
- thread_t thread,
- time_value_t *user_time_p,
- time_value_t *system_time_p)
-{
- timer_save_data_t temp;
- register timer_t timer;
-
- timer = &thread->user_timer;
- db_timer_grab(timer, &temp);
-
-#ifdef TIMER_ADJUST
- TIMER_ADJUST(&temp);
-#endif /* TIMER_ADJUST */
- user_time_p->seconds = temp.high + temp.low/1000000;
- user_time_p->microseconds = temp.low % 1000000;
-
- timer = &thread->system_timer;
- timer_grab(timer, &temp);
-
-#ifdef TIMER_ADJUST
- TIMER_ADJUST(&temp);
-#endif /* TIMER_ADJUST */
- system_time_p->seconds = temp.high + temp.low/1000000;
- system_time_p->microseconds = temp.low % 1000000;
+ PROCESSOR_DATA(processor, current_timer) = new_timer;
+ new_timer->tstamp = tstamp;
}
-/*
- * timer_delta takes the difference of a saved timer value
- * and the current one, and updates the saved value to current.
- * The difference is returned as a function value. See
- * TIMER_DELTA macro (timer.h) for optimization to this.
- */
-
-unsigned
-timer_delta(
- register timer_t timer,
- timer_save_t save)
-{
- timer_save_data_t new_save;
- register unsigned result;
+#endif /* MACHINE_TIMER_ROUTINES */
- timer_grab(timer,&new_save);
- result = (new_save.high - save->high) * TIMER_HIGH_UNIT +
- new_save.low - save->low;
- save->high = new_save.high;
- save->low = new_save.low;
- return(result);
-}
+#endif /* STAT_TIME */
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