scsi_endian.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        scsi_endian.h,v $
   29  * Revision 2.2  91/06/19  14:29:16  rvb
   30  *      Created.
   31  *      [91/06/11            af]
   32  * 
   33  */
   34 /*
   35  *      File: scsi_endian.h
   36  *      Author: Alessandro Forin, Carnegie Mellon University
   37  *      Date:   6/91
   38  *
   39  *      Byte/Bit order issues are solved here.
   40  */
   41 
   42 
   43 #ifndef _SCSI_ENDIAN_H_
   44 #define _SCSI_ENDIAN_H_ 1
   45 
   46 /*
   47  * Macros to take care of bitfield placement within a byte.
   48  * It might be possible to extend these to something that
   49  * takes care of multibyte structures, using perhaps the
   50  * type ("t") parameter.  Someday.
   51  */
   52 #if     BYTE_MSF
   53 
   54 #define BITFIELD_2(t,a,b)               t b,a
   55 #define BITFIELD_3(t,a,b,c)             t c,b,a
   56 #define BITFIELD_4(t,a,b,c,d)           t d,c,b,a
   57 #define BITFIELD_5(t,a,b,c,d,e)         t e,d,c,b,a
   58 #define BITFIELD_6(t,a,b,c,d,e,f)       t f,e,d,c,b,a
   59 #define BITFIELD_7(t,a,b,c,d,e,f,g)     t g,f,e,d,c,b,a
   60 #define BITFIELD_8(t,a,b,c,d,e,f,g,h)   t h,g,f,e,d,c,b,a
   61 
   62 #else   /*BYTE_MSF*/
   63 
   64 #define BITFIELD_2(t,a,b)               t a,b
   65 #define BITFIELD_3(t,a,b,c)             t a,b,c
   66 #define BITFIELD_4(t,a,b,c,d)           t a,b,c,d
   67 #define BITFIELD_5(t,a,b,c,d,e)         t a,b,c,d,e
   68 #define BITFIELD_6(t,a,b,c,d,e,f)       t a,b,c,d,e
   69 #define BITFIELD_7(t,a,b,c,d,e,f,g)     t a,b,c,d,e,f,g
   70 #define BITFIELD_8(t,a,b,c,d,e,f,g,h)   t a,b,c,d,e,f,g,h
   71 
   72 #endif  /*BYTE_MSF*/
   73 
   74 #endif  /*_SCSI_ENDIAN_H_*/

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

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