include/minix/blockdriver.h

   1 #ifndef _MINIX_BLOCKDRIVER_H
   2 #define _MINIX_BLOCKDRIVER_H
   3
   4 #include <minix/driver.h>
   5
   6 typedef int device_id_t;
   7 typedef int thread_id_t;
   8
   9 /* Types supported for the 'type' field of struct blockdriver. */
  10 typedef enum {
  11   BLOCKDRIVER_TYPE_DISK,                /* handle partition requests */
  12   BLOCKDRIVER_TYPE_OTHER                /* do not handle partition requests */
  13 } blockdriver_type_t;
  14
  15 /* Entry points into the device dependent code of block drivers. */
  16 struct blockdriver {
  17   blockdriver_type_t bdr_type;
  18   int (*bdr_open)(devminor_t minor, int access);
  19   int (*bdr_close)(devminor_t minor);
  20   ssize_t (*bdr_transfer)(devminor_t minor, int do_write, u64_t pos,
  21           endpoint_t endpt, iovec_t *iov, unsigned int count, int flags);
  22   int (*bdr_ioctl)(devminor_t minor, unsigned long request, endpoint_t endpt,
  23           cp_grant_id_t grant, endpoint_t user_endpt);
  24   void (*bdr_cleanup)(void);
  25   struct device *(*bdr_part)(devminor_t minor);
  26   void (*bdr_geometry)(devminor_t minor, struct part_geom *part);
  27   void (*bdr_intr)(unsigned int mask);
  28   void (*bdr_alarm)(clock_t stamp);
  29   void (*bdr_other)(message *m_ptr, int ipc_status);
  30   int (*bdr_device)(devminor_t minor, device_id_t *id);
  31 };
  32
  33 /* Functions defined by libblockdriver. These can be used for both
  34  * singlethreaded and multithreaded drivers.
  35  */
  36 void blockdriver_announce(int type);
  37
  38 #ifndef _BLOCKDRIVER_MT_API
  39 /* Additional functions for the singlethreaded version. These allow the driver
  40  * to either use the stock driver_task(), or implement its own message loop.
  41  * To avoid accidents, these functions are not exposed when minix/driver_mt.h
  42  * has been included previously.
  43  */
  44 int blockdriver_receive_mq(message *m_ptr, int *status_ptr);
  45 void blockdriver_process(struct blockdriver *dp, message *m_ptr, int
  46         ipc_status);
  47 void blockdriver_terminate(void);
  48 void blockdriver_task(struct blockdriver *bdp);
  49 int blockdriver_mq_queue(message *m_ptr, int status);
  50 #endif /* !_BLOCKDRIVER_MT_API */
  51
  52 /* Parameters for the disk drive. */
  53 #define SECTOR_SIZE      512    /* physical sector size in bytes */
  54 #define SECTOR_SHIFT       9    /* for division */
  55 #define SECTOR_MASK      511    /* and remainder */
  56
  57 #define CD_SECTOR_SIZE  2048    /* sector size of a CD-ROM in bytes */
  58
  59 /* Size of the DMA buffer buffer in bytes. */
  60 #define DMA_BUF_SIZE    (DMA_SECTORS * SECTOR_SIZE)
  61
  62 #endif /* _MINIX_BLOCKDRIVER_H */