usr/src/sys/i386/isa/isa_device.h

/*
 * ISA Bus Autoconfiguration
 *      @(#)isa_device.h        1.1 (Berkeley) %G%
 */

/*
 * Per device structure.
 */
struct isa_device {
        struct  isa_driver *id_driver;
        short   id_iobase;      /* base i/o address */
        short   id_irq;         /* interrupt request */
        short   id_drq;         /* DMA request */
        caddr_t id_maddr;       /* physical i/o memory address on bus (if any)*/
        int     id_msize;       /* size of i/o memory */
        int     (*id_intr)();   /* interrupt interface routine */
        int     id_unit;        /* unit number */
        int     id_scsiid;      /* scsi id if needed */
        int     id_alive;       /* device is present */
};

/*
 * Per-driver structure.
 *
 * Each device driver defines entries for a set of routines
 * as well as an array of types which are acceptable to it.
 * These are used at boot time by the configuration program.
 */
struct isa_driver {
        int     (*probe)();             /* test whether device is present */
        int     (*attach)();            /* setup driver for a device */
        char    *name;                  /* device name */
};

extern struct isa_device isa_devtab_bio[], isa_devtab_tty[], isa_devtab_net[],
                isa_devtab_null[];