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/**
* @file
*
* @ingroup rtems_ramdisk
*
* @brief RAM disk block device implementation.
*/
/*
* Copyright (c) 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <rtems.h>
#include <rtems/ramdisk.h>
const rtems_driver_address_table ramdisk_ops = {
.initialization_entry = NULL,
RTEMS_GENERIC_BLOCK_DEVICE_DRIVER_ENTRIES
};
ramdisk *ramdisk_allocate(
void *area_begin,
uint32_t block_size,
rtems_blkdev_bnum block_count,
bool trace
)
{
struct ramdisk *rd = malloc(sizeof(struct ramdisk));
if (rd == NULL) {
return NULL;
}
if (area_begin == NULL) {
area_begin = calloc(block_count, block_size);
if (area_begin == NULL) {
free(rd);
return NULL;
}
rd->malloced = true;
} else {
rd->malloced = false;
}
rd->block_size = block_size;
rd->block_num = block_count;
rd->area = area_begin;
rd->trace = trace;
rd->initialized = true;
return rd;
}
void ramdisk_free(ramdisk *rd)
{
if (rd != NULL) {
if (rd->malloced) {
free(rd->area);
}
free(rd);
}
}
rtems_status_code ramdisk_register(
uint32_t block_size,
rtems_blkdev_bnum block_count,
bool trace,
const char *disk,
dev_t *dev_ptr
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_device_major_number major = 0;
ramdisk *rd = NULL;
dev_t dev = 0;
sc = rtems_io_register_driver(0, &ramdisk_ops, &major);
if (sc != RTEMS_SUCCESSFUL) {
return RTEMS_UNSATISFIED;
}
rd = ramdisk_allocate(NULL, block_size, block_count, trace);
if (rd == NULL) {
rtems_io_unregister_driver(major);
return RTEMS_UNSATISFIED;
}
dev = rtems_filesystem_make_dev_t(major, 0);
sc = rtems_disk_create_phys(
dev,
block_size,
block_count,
ramdisk_ioctl,
rd,
disk
);
if (sc != RTEMS_SUCCESSFUL) {
ramdisk_free(rd);
rtems_io_unregister_driver(major);
return RTEMS_UNSATISFIED;
}
*dev_ptr = dev;
return RTEMS_SUCCESSFUL;
}
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