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- /****************************************************************************
- * sched/wdog/wd_initialize.c
- *
- * Copyright (C) 2007, 2009, 2014 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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 NuttX 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 OWNER 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * 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;
- }
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