/* task_monitor.c - microkernel task monitoring subsystem */

/*
 * Copyright (c) 1997-2010, 2013-2015 Wind River Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2) Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3) Neither the name of Wind River Systems nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef CONFIG_TASK_MONITOR

#include <minik.h>
#include <microkernel/ticks.h>
#include <drivers/system_timer.h>
#include <toolchain.h>
#include <sections.h>

static struct k_mrec __noinit k_monitor_buff[CONFIG_TASK_MONITOR_CAPACITY];

static const int k_monitor_capacity = CONFIG_TASK_MONITOR_CAPACITY;
const int _k_monitor_mask = CONFIG_TASK_MONITOR_MASK;

static struct k_mrec *k_monitor_wptr = k_monitor_buff;
static int k_monitor_nrec = 0;
static int K_monitor_wind = 0;

k_task_monitor_hook_t _k_task_switch_callback = NULL;

extern const int _k_num_events;

void task_monitor_hook_set(k_task_monitor_hook_t func)
{
	_k_task_switch_callback = func;
}

void _k_task_monitor(struct k_proc *X, uint32_t D)
{
#ifdef CONFIG_TASK_DEBUG
	if (!_k_debug_halt)
#endif
	{
		k_monitor_wptr->time = timer_read();
		k_monitor_wptr->data1 = X->Ident;
		k_monitor_wptr->data2 = D;
		if (++K_monitor_wind == k_monitor_capacity) {
			K_monitor_wind = 0;
			k_monitor_wptr = k_monitor_buff;
		} else {
			++k_monitor_wptr;
		}
		if (k_monitor_nrec < k_monitor_capacity) {
			k_monitor_nrec++;
		}
	}
	if ((_k_task_switch_callback != NULL) && (D == 0)) {
		(_k_task_switch_callback)(X->Ident, timer_read());
	}
}

void _k_task_monitor_args(struct k_args *A)
{
#ifdef CONFIG_TASK_DEBUG
	if (!_k_debug_halt)
#endif
	{
		k_monitor_wptr->time = timer_read();

		if ((uint32_t)A < _k_num_events) {
			k_monitor_wptr->data2 = MO_EVENT | (uint32_t)A;
		} else {
			k_monitor_wptr->data1 = _k_current_task->Ident;
			k_monitor_wptr->data2 = MO_LCOMM | A->Comm;
		}

		if (++K_monitor_wind == k_monitor_capacity) {
			K_monitor_wind = 0;
			k_monitor_wptr = k_monitor_buff;
		} else {
			++k_monitor_wptr;
		}

		if (k_monitor_nrec < k_monitor_capacity) {
			k_monitor_nrec++;
		}
	}
}

void _k_task_monitor_read(struct k_args *A)
{
	A->Args.z4.nrec = k_monitor_nrec;
	if (A->Args.z4.rind < k_monitor_nrec) {
		int i = K_monitor_wind - k_monitor_nrec + A->Args.z4.rind;
		if (i < 0) {
			i += k_monitor_capacity;
		}
		A->Args.z4.mrec = k_monitor_buff[i];
	}
}

#endif /* CONFIG_TASK_MONITOR */