/* control.c - control */

#include 

/*------------------------------------------------------------------------
 *  control  -  Control a device or a driver (e.g., set the driver mode)
 *------------------------------------------------------------------------
 */
syscall control(
          did32         descrp,         /* Descriptor for device        */
          int32         func,           /* Specific control function    */
          int32         arg1,           /* Specific argument for func   */
          int32         arg2            /* Specific argument for func   */
        )
{
        intmask         mask;           /* Saved interrupt mask         */
        struct dentry   *devptr;        /* Entry in device switch table */
        int32           retval;         /* Value to return to caller    */

        mask = disable();
        if (isbaddev(descrp)) {
                restore(mask);
                return SYSERR;
        }
        devptr = (struct dentry *) &devtab[descrp];
        retval = (*devptr->dvcntl) (devptr, func, arg1, arg2);
        restore(mask);
        return retval;
}