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vaxfp.h revision 1.3 
      1 /*	$NetBSD: vaxfp.h,v 1.3 2004/01/20 19:09:27 matt 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 #define	FFLT_EXPBITS		8
     48 #define	FFLT_FRACBITS		23
     49 
     50 #define	DFLT_EXPBITS		8
     51 #define	DFLT_FRACBITS		55
     52 
     53 struct vax_f_floating {
     54 	unsigned int	fflt_frach:7;
     55 	unsigned int	fflt_exp:8;
     56 	unsigned int	fflt_sign:1;
     57 	unsigned int	fflt_fracl:16;
     58 };
     59 
     60 struct vax_d_floating {
     61 	unsigned int	dflt_frach:7;
     62 	unsigned int	dflt_exp:8;
     63 	unsigned int	dflt_sign:1;
     64 	unsigned int	dflt_fracm:16;
     65 	unsigned int	dflt_fracl;
     66 };
     67 
     68 /*
     69  * Exponent biases.
     70  */
     71 #define	FFLT_EXP_BIAS	128
     72 #define	DFLT_EXP_BIAS	128
     73 
     74 /*
     75  * Convenience data structures.
     76  */
     77 union vax_ffloating_u {
     78 	float			ffltu_f;
     79 	struct vax_f_floating	ffltu_fflt;
     80 };
     81 
     82 union vax_dfloating_u {
     83 	double			dfltu_d;
     84 	struct vax_d_floating	dfltu_dflt;
     85 };
     86 
     87 #endif /* _VAX_VAXFP_H__ */
     88