126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/****************************************************************************
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* sched/wdog/wd_initialize.c
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*
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* Copyright (C) 2007, 2009, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <queue.h>
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#include "wdog/wdog.h"
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* The g_wdfreelist data structure is a singly linked list of watchdogs
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* available to the system for delayed function use.
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*/
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sq_queue_t g_wdfreelist;
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/* The g_wdactivelist data structure is a singly linked list ordered by
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* watchdog expiration time. When watchdog timers expire,the functions on
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* this linked list are removed and the function is called.
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*/
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sq_queue_t g_wdactivelist;
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/* This is the number of free, pre-allocated watchdog structures in the
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* g_wdfreelist. This value is used to enforce a reserve for interrupt
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* handlers.
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*/
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uint16_t g_wdnfree;
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* g_wdpool is a list of pre-allocated watchdogs. The number of watchdogs
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* in the pool is a configuration item.
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*/
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static struct wdog_s g_wdpool[CONFIG_PREALLOC_WDOGS];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: wd_initialize
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*
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* Description:
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* This function initializes the watchdog data structures
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* This function must be called early in the initialization sequence
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* before the timer interrupt is attached and before any watchdog
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* services are used.
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*
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****************************************************************************/
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void wd_initialize(void)
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{
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FAR struct wdog_s *wdog = g_wdpool;
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int i;
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/* Initialize watchdog lists */
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sq_init(&g_wdfreelist);
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sq_init(&g_wdactivelist);
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/* The g_wdfreelist must be loaded at initialization time to hold the
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* configured number of watchdogs.
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*/
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for (i = 0; i < CONFIG_PREALLOC_WDOGS; i++)
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{
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sq_addlast((FAR sq_entry_t *)wdog++, &g_wdfreelist);
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}
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/* All watchdogs are free */
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g_wdnfree = CONFIG_PREALLOC_WDOGS;
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}
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