158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
/*
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* Copyright (c) 1997-2010, 2012-2015 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Microkernel tick event handler
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*
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* This module implements the microkernel's tick event handler.
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*/
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#include <nanokernel.h>
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#include <arch/cpu.h>
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#include <micro_private.h>
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#include <drivers/system_timer.h>
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#include <microkernel.h>
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#include <microkernel/ticks.h>
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#include <toolchain.h>
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#include <sections.h>
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#ifdef CONFIG_TIMESLICING
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static int32_t slice_count = (int32_t)0;
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static int32_t slice_time = (int32_t)CONFIG_TIMESLICE_SIZE;
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static kpriority_t slice_prio =
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(kpriority_t)CONFIG_TIMESLICE_PRIORITY;
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#endif /* CONFIG_TIMESLICING */
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#ifdef CONFIG_TICKLESS_IDLE
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/* Number of ticks elapsed that have not been announced to the microkernel */
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int32_t _sys_idle_elapsed_ticks; /* Initial value must be 0 */
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#endif
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/**
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* @internal
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* @brief Task level debugging tick handler
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*
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* If task level debugging is configured this routine updates the low resolution
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* debugging timer and determines if task level processing should be suspended.
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*
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* @return 0 if task level processing should be halted or 1 if not
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*
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*/
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#ifdef CONFIG_TASK_DEBUG
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uint32_t __noinit _k_debug_sys_clock_tick_count;
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static inline int _TlDebugUpdate(int32_t ticks)
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{
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_k_debug_sys_clock_tick_count += ticks;
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return !_k_debug_halt;
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}
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#else
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#define _TlDebugUpdate(ticks) 1
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#endif
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/**
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* @internal
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* @brief Tick handler time slice logic
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*
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* This routine checks to see if it is time for the current task
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* to relinquish control, and yields CPU if so.
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*
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* @return N/A
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*
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*/
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static inline void _TimeSliceUpdate(void)
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{
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#ifdef CONFIG_TIMESLICING
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int yield = slice_time && (_k_current_task->priority >= slice_prio) &&
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(++slice_count >= slice_time);
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if (yield) {
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slice_count = 0;
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_k_task_yield(NULL);
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}
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#else
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/* do nothing */
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#endif /* CONFIG_TIMESLICING */
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}
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/**
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* @internal
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* @brief Get elapsed ticks
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*
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* If tickless idle support is configured this routine returns the number
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* of ticks since going idle and then resets the global elapsed tick counter back
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* to zero indicating all elapsed ticks have been consumed. This is done with
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* interrupts locked to prevent the timer ISR from modifying the global elapsed
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* tick counter.
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* If tickless idle support is not configured in it simply returns 1.
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*
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* @return number of ticks to process
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*/
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static inline int32_t _SysIdleElapsedTicksGet(void)
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{
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#ifdef CONFIG_TICKLESS_IDLE
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int32_t ticks;
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int key;
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key = irq_lock();
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ticks = _sys_idle_elapsed_ticks;
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_sys_idle_elapsed_ticks = 0;
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irq_unlock(key);
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return ticks;
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#else
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/* A single tick always elapses when not in tickless mode */
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return 1;
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#endif
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}
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/**
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*
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* @brief Microkernel tick handler
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*
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* This routine informs other microkernel subsystems that a tick event has
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* occurred.
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* @param even Event
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* @return 1
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*/
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int _k_ticker(int event)
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{
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(void)event; /* prevent "unused argument" compiler warning */
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int32_t ticks;
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ticks = _SysIdleElapsedTicksGet();
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_k_workload_monitor_update();
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if (_TlDebugUpdate(ticks)) {
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_TimeSliceUpdate();
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_k_timer_list_update(ticks);
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_nano_sys_clock_tick_announce(ticks);
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}
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return 1;
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}
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#ifdef CONFIG_TIMESLICING
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void sys_scheduler_time_slice_set(int32_t t, kpriority_t p)
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{
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slice_time = t;
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slice_prio = p;
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}
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#endif /* CONFIG_TIMESLICING */
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