nuttx/sched/wdog/wd_initialize.c

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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"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* 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;
/****************************************************************************
* Private Data
****************************************************************************/
/* g_wdpool is a list of pre-allocated watchdogs. The number of watchdogs
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* in the pool is a configuration item.
*/
static struct wdog_s g_wdpool[CONFIG_PREALLOC_WDOGS];
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: wd_initialize
*
* Description:
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* This function initializes the watchdog data structures
*
* Parameters:
* None
*
* Return 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++)
{
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sq_addlast((FAR sq_entry_t *)wdog++, &g_wdfreelist);
}
/* All watchdogs are free */
g_wdnfree = CONFIG_PREALLOC_WDOGS;
}