devmap_callback_ctl Structure

The device driver must allocate and initialize a devmap_callback_ctl(9S) structure to inform the system about the entry point routines for device context management.

This structure uses the following syntax:

struct devmap_callback_ctl {    
    int devmap_rev;
    int (*devmap_map)(devmap_cookie_t dhp, dev_t dev,
    uint_t flags, offset_t off, size_t len, void **pvtp);
    int (*devmap_access)(devmap_cookie_t dhp, void *pvtp,
    offset_t off, size_t len, uint_t type, uint_t rw);
    int (*devmap_dup)(devmap_cookie_t dhp, void *pvtp,
    devmap_cookie_t new_dhp, void **new_pvtp);
    void (*devmap_unmap)(devmap_cookie_t dhp, void *pvtp,
    offset_t off, size_t len, devmap_cookie_t new_dhp1,
    void **new_pvtp1, devmap_cookie_t new_dhp2,
    void **new_pvtp2);
};

devmap_rev

The version number of the devmap_callback_ctl structure. The version number must be set to DEVMAP_OPS_REV.

devmap_map

Must be set to the address of the driver's devmap_map(9E) entry point.

devmap_access

Must be set to the address of the driver's devmap_access(9E) entry point.

devmap_dup

Must be set to the address of the driver's devmap_dup(9E) entry point.

devmap_unmap

Must be set to the address of the driver's devmap_unmap(9E) entry point.