ramdisk.h

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/*
 * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
 * Author: Victor V. Vengerov <vvv@oktet.ru>
 */

#ifndef _RTEMS_RAMDISK_H
#define _RTEMS_RAMDISK_H


#include <rtems.h>
#include <rtems/blkdev.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct rtems_ramdisk_config {
  uint32_t block_size;

  rtems_blkdev_bnum block_num;

  void *location;
} rtems_ramdisk_config;

extern rtems_ramdisk_config rtems_ramdisk_configuration [];

extern size_t rtems_ramdisk_configuration_size;

rtems_device_driver ramdisk_initialize(
 rtems_device_major_number major,
 rtems_device_minor_number minor,
 void *arg
);

#define RAMDISK_DRIVER_TABLE_ENTRY \
  { \
    .initialization_entry = ramdisk_initialize, \
    RTEMS_GENERIC_BLOCK_DEVICE_DRIVER_ENTRIES \
  }

#define RAMDISK_DEVICE_BASE_NAME "/dev/rd"

typedef struct ramdisk {
  uint32_t block_size;

  rtems_blkdev_bnum block_num;

  void *area;

  bool initialized;

  bool malloced;

  bool trace;

  bool free_at_delete_request;
} ramdisk;

extern const rtems_driver_address_table ramdisk_ops;

int ramdisk_ioctl(rtems_disk_device *dd, uint32_t req, void *argp);

ramdisk *ramdisk_allocate(
  void *area_begin,
  uint32_t media_block_size,
  rtems_blkdev_bnum media_block_count,
  bool trace
);

void ramdisk_free(ramdisk *rd);

static inline void ramdisk_enable_free_at_delete_request(ramdisk *rd)
{
  rd->free_at_delete_request = true;
}

rtems_status_code ramdisk_register(
  uint32_t media_block_size,
  rtems_blkdev_bnum media_block_count,
  bool trace,
  const char *disk,
  dev_t *dev
);

#ifdef __cplusplus
}
#endif

#endif