LCOM1920-T02G10

#ifndef _MINIX_BLOCKDRIVER_H

#define _MINIX_BLOCKDRIVER_H

#include <minix/driver.h>

typedef int device_id_t;

typedef int thread_id_t;

/* Types supported for the 'type' field of struct blockdriver. */

typedef enum {

  BLOCKDRIVER_TYPE_DISK,                /* handle partition requests */

  BLOCKDRIVER_TYPE_OTHER                /* do not handle partition requests */

} blockdriver_type_t;

/* Entry points into the device dependent code of block drivers. */

struct blockdriver {

  blockdriver_type_t bdr_type;

  int (*bdr_open)(devminor_t minor, int access);

  int (*bdr_close)(devminor_t minor);

  ssize_t (*bdr_transfer)(devminor_t minor, int do_write, u64_t pos,

          endpoint_t endpt, iovec_t *iov, unsigned int count, int flags);

  int (*bdr_ioctl)(devminor_t minor, unsigned long request, endpoint_t endpt,

          cp_grant_id_t grant, endpoint_t user_endpt);

  void (*bdr_cleanup)(void);

  struct device *(*bdr_part)(devminor_t minor);

  void (*bdr_geometry)(devminor_t minor, struct part_geom *part);

  void (*bdr_intr)(unsigned int mask);

  void (*bdr_alarm)(clock_t stamp);

  void (*bdr_other)(message *m_ptr, int ipc_status);

  int (*bdr_device)(devminor_t minor, device_id_t *id);

};

/* Functions defined by libblockdriver. These can be used for both

 * singlethreaded and multithreaded drivers.

 */

void blockdriver_announce(int type);

#ifndef _BLOCKDRIVER_MT_API

/* Additional functions for the singlethreaded version. These allow the driver

 * to either use the stock driver_task(), or implement its own message loop.

 * To avoid accidents, these functions are not exposed when minix/driver_mt.h

 * has been included previously.

 */

int blockdriver_receive_mq(message *m_ptr, int *status_ptr);

void blockdriver_process(struct blockdriver *dp, message *m_ptr, int

        ipc_status);

void blockdriver_terminate(void);

void blockdriver_task(struct blockdriver *bdp);

int blockdriver_mq_queue(message *m_ptr, int status);

#endif /* !_BLOCKDRIVER_MT_API */

/* Parameters for the disk drive. */

#define SECTOR_SIZE      512        /* physical sector size in bytes */

#define SECTOR_SHIFT       9        /* for division */

#define SECTOR_MASK      511        /* and remainder */

#define CD_SECTOR_SIZE  2048        /* sector size of a CD-ROM in bytes */

/* Size of the DMA buffer buffer in bytes. */

#define DMA_BUF_SIZE        (DMA_SECTORS * SECTOR_SIZE)

#endif /* _MINIX_BLOCKDRIVER_H */