137 lines
4.4 KiB
C
137 lines
4.4 KiB
C
/************************************************************
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* wd_initialize.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 Gregory Nutt 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 <sys/types.h>
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#include <queue.h>
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#include <nuttx/kmalloc.h>
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#include "os_internal.h"
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#include "wd_internal.h"
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Private Type Declarations
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************************************************************/
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/************************************************************
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* Global Variables
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************************************************************/
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/* The g_wdfreelist data structure is a singly linked list
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* of watchdogs available to the system for delayed function
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* use.
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*/
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sq_queue_t g_wdfreelist;
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/* g_wdpool is a pointer to a list of pre-allocated watchdogs.
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* The number of watchdogs in the pool is a configuration
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* item.
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*/
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FAR wdog_t *g_wdpool;
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/* The g_wdactivelist data structure is a singly linked list
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* ordered by watchdog expiration time. When watchdog timers
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* expire,the functions on this linked list are removed and
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* the function is called.
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*/
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sq_queue_t g_wdactivelist;
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/************************************************************
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* Private Variables
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************************************************************/
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Public Functions
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************************************************************/
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/************************************************************
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* Function: wd_initialize
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*
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* Description:
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* This function initalized the watchdog data structures
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*
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* Parameters:
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* None
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*
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* Return 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
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* sequence before the timer interrupt is attached and
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* before any watchdog 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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/* Initialize the free watchdog list */
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sq_init(&g_wdfreelist);
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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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g_wdpool = (FAR wdog_t*)kmalloc(sizeof(wdog_t) * CONFIG_PREALLOC_WDOGS);
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if (g_wdpool)
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{
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FAR wdog_t *wdog = g_wdpool;
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int i;
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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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}
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/* The g_wdactivelist queue must be reset at initialization time. */
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sq_init(&g_wdactivelist);
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}
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