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- /*
- * Used to dissect integer device code
- * into major (driver designation) and
- * minor (driver parameter) parts.
- */
- struct
- {
- char d_minor;
- char d_major;
- };
-
- /*
- * Declaration of block device
- * switch. Each entry (row) is
- * the only link between the
- * main unix code and the driver.
- * The initialization of the
- * device switches is in the
- * file conf.c.
- */
- struct bdevsw
- {
- int (*d_open)();
- int (*d_close)();
- int (*d_strategy)();
- int *d_tab;
- } bdevsw[];
-
- /*
- * Nblkdev is the number of entries
- * (rows) in the block switch. It is
- * set in binit/bio.c by making
- * a pass over the switch.
- * Used in bounds checking on major
- * device numbers.
- */
- int nblkdev;
-
- /*
- * Character device switch.
- */
- struct cdevsw
- {
- int (*d_open)();
- int (*d_close)();
- int (*d_read)();
- int (*d_write)();
- int (*d_sgtty)();
- } cdevsw[];
-
- /*
- * Number of character switch entries.
- * Set by cinit/tty.c
- */
- int nchrdev;
-