libblock/src/ramdisk-init.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup rtems_ramdisk
0007  *
0008  * @brief RAM disk block device implementation.
0009  */
0010
0011 /*
0012  * Copyright (C) 2009, 2012 embedded brains GmbH & Co. KG
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 #include <stdlib.h>
0041
0042 #include <rtems.h>
0043 #include <rtems/ramdisk.h>
0044
0045 ramdisk *ramdisk_allocate(
0046   void *area_begin,
0047   uint32_t media_block_size,
0048   rtems_blkdev_bnum media_block_count,
0049   bool trace
0050 )
0051 {
0052   struct ramdisk *rd = calloc(1, sizeof(*rd));
0053
0054   if (rd == NULL) {
0055     return NULL;
0056   }
0057
0058   if (area_begin == NULL) {
0059     area_begin = calloc(media_block_count, media_block_size);
0060     if (area_begin == NULL) {
0061       free(rd);
0062
0063       return NULL;
0064     }
0065     rd->malloced = true;
0066   } else {
0067     rd->malloced = false;
0068   }
0069   rd->block_size = media_block_size;
0070   rd->block_num = media_block_count;
0071   rd->area = area_begin;
0072   rd->trace = trace;
0073   rd->initialized = true;
0074
0075   return rd;
0076 }
0077
0078 void ramdisk_free(ramdisk *rd)
0079 {
0080   if (rd != NULL) {
0081     if (rd->malloced) {
0082       free(rd->area);
0083     }
0084     free(rd);
0085   }
0086 }