119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/****************************************************************************
|
|
* sched/wdog/wd_initialize.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <queue.h>
|
|
|
|
#include "wdog/wdog.h"
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/* The g_wdfreelist data structure is a singly linked list of watchdogs
|
|
* available to the system for delayed function use.
|
|
*/
|
|
|
|
sq_queue_t g_wdfreelist;
|
|
|
|
/* The g_wdactivelist data structure is a singly linked list ordered by
|
|
* watchdog expiration time. When watchdog timers expire,the functions on
|
|
* this linked list are removed and the function is called.
|
|
*/
|
|
|
|
sq_queue_t g_wdactivelist;
|
|
|
|
/* This is the number of free, pre-allocated watchdog structures in the
|
|
* g_wdfreelist. This value is used to enforce a reserve for interrupt
|
|
* handlers.
|
|
*/
|
|
|
|
uint16_t g_wdnfree;
|
|
|
|
/* This is wdog tickbase, for wd_gettime() may called many times
|
|
* between 2 times of wd_timer(), we use it to update wd_gettime().
|
|
*/
|
|
|
|
#ifdef CONFIG_SCHED_TICKLESS
|
|
clock_t g_wdtickbase;
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/* g_wdpool is a list of pre-allocated watchdogs. The number of watchdogs
|
|
* in the pool is a configuration item.
|
|
*/
|
|
|
|
static struct wdog_s g_wdpool[CONFIG_PREALLOC_WDOGS];
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: wd_initialize
|
|
*
|
|
* Description:
|
|
* This function initializes the watchdog data structures
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* This function must be called early in the initialization sequence
|
|
* before the timer interrupt is attached and before any watchdog
|
|
* services are used.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void wd_initialize(void)
|
|
{
|
|
FAR struct wdog_s *wdog = g_wdpool;
|
|
int i;
|
|
|
|
/* Initialize watchdog lists */
|
|
|
|
sq_init(&g_wdfreelist);
|
|
sq_init(&g_wdactivelist);
|
|
|
|
/* The g_wdfreelist must be loaded at initialization time to hold the
|
|
* configured number of watchdogs.
|
|
*/
|
|
|
|
for (i = 0; i < CONFIG_PREALLOC_WDOGS; i++)
|
|
{
|
|
sq_addlast((FAR sq_entry_t *)wdog++, &g_wdfreelist);
|
|
}
|
|
|
|
/* All watchdogs are free */
|
|
|
|
g_wdnfree = CONFIG_PREALLOC_WDOGS;
|
|
}
|