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vaxfp.h revision 1.6 
      1 /*	$NetBSD: vaxfp.h,v 1.6 2007/02/26 01:32:29 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * vaxfp.h defines the layout of VAX Floating-Point data types.
     41  * Only F_floating and D_floating types are defined here;
     42  * G_floating and H_floating are not supported by NetBSD.
     43  */
     44 #ifndef _VAX_VAXFP_H_
     45 #define	_VAX_VAXFP_H_
     46 
     47 
     48 #define	FFLT_EXPBITS	8
     49 #define	FFLT_FRACHBITS	7
     50 #define	FFLT_FRACLBITS	16
     51 #define	FFLT_FRACBITS	(FFLT_FRACLBITS + FFLT_FRACHBITS)
     52 
     53 struct vax_f_floating {
     54 	unsigned int	fflt_frach:FFLT_FRACHBITS;
     55 	unsigned int	fflt_exp:FFLT_EXPBITS;
     56 	unsigned int	fflt_sign:1;
     57 	unsigned int	fflt_fracl:FFLT_FRACLBITS;
     58 };
     59 
     60 #define	DFLT_EXPBITS	8
     61 #define	DFLT_FRACHBITS	7
     62 #define	DFLT_FRACMBITS	16
     63 #define	DFLT_FRACLBITS	32
     64 #define	DFLT_FRACBITS	(DFLT_FRACLBITS + DFLT_FRACMBITS + DFLT_FRACHBITS)
     65 
     66 struct vax_d_floating {
     67 
     68 	unsigned int	dflt_frach:DFLT_FRACHBITS;
     69 	unsigned int	dflt_exp:DFLT_EXPBITS;
     70 	unsigned int	dflt_sign:1;
     71 	unsigned int	dflt_fracm:DFLT_FRACMBITS;
     72 	unsigned int	dflt_fracl:DFLT_FRACLBITS;
     73 };
     74 
     75 /*
     76  * Exponent biases.
     77  */
     78 #define	FFLT_EXP_BIAS	128
     79 #define	DFLT_EXP_BIAS	128
     80 
     81 /*
     82  * Convenience data structures.
     83  */
     84 union vax_ffloating_u {
     85 	float			ffltu_f;
     86 	struct vax_f_floating	ffltu_fflt;
     87 };
     88 
     89 union vax_dfloating_u {
     90 	double			dfltu_d;
     91 	struct vax_d_floating	dfltu_dflt;
     92 };
     93 
     94 #endif /* _VAX_VAXFP_H_ */
     95