FreeBSD/Linux Kernel Cross Reference
sys/scsi/scsi_generic.h

     /*
      * Contributed by HD Associates (contact: dufault@hda.com)
      * Copyright (c) 1992, 1993 HD Associates
      *
      * Berkeley style copyright.  I've just snarfed it out of stdio.h:
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)stdio.h       5.17 (Berkeley) 6/3/91
     * $FreeBSD: src/sys/scsi/scsi_generic.h,v 1.4.10.1 1999/09/05 08:21:44 peter Exp $
     */
    
    /* generic SCSI header file.  We use the same minor number format
     * as on SGI except that the flag bits aren't available because they
     * are used as the board index.
     *
     * The minor number format is:
     *  FF UUU III (FFUU UIII)
     *
     * Where:
     *  FF is the board index
     * UUU are the LUN
     * III is the SCSI ID (controller)
     */
    
    #ifndef _SCSI_GENERIC_H_
    #define _SCSI_GENERIC_H_
    
    #define G_SCSI_FLAG(DEV) (((DEV) & 0xC0) >> 6)
    #define G_SCSI_UNIT(DEV) G_SCSI_FLAG(DEV)
    #define G_SCSI_LUN(DEV) (((DEV) & 0x38) >> 3)
    #define G_SCSI_ID(DEV) ((DEV) & 0x7)
    
    #define G_SCSI_MINOR(FLAG, LUN, ID)  \
     (((FLAG) << 6) | ((LUN) << 3) | (ID))
    
    #endif /* _SCSI_GENERIC_H_ */

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