sys/cpu/i386/include/ieeefp.h

   1 /*-
   2  * Copyright (c) 1990 Andrew Moore, Talke Studio
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      from: @(#) ieeefp.h     1.0 (Berkeley) 9/23/93
  34  * $FreeBSD: src/sys/i386/include/ieeefp.h,v 1.7 1999/08/28 00:44:15 peter Exp $
  35  * $DragonFly: src/sys/cpu/i386/include/ieeefp.h,v 1.3 2006/11/07 17:51:21 dillon Exp $
  36  */
  37
  38 /*
  39  *      IEEE floating point type and constant definitions.
  40  */
  41
  42 #ifndef _CPU_IEEEFP_H_
  43 #define _CPU_IEEEFP_H_
  44
  45 /*
  46  * FP rounding modes
  47  */
  48 typedef enum {
  49         FP_RN=0,        /* round to nearest */
  50         FP_RM,          /* round down to minus infinity */
  51         FP_RP,          /* round up to plus infinity */
  52         FP_RZ           /* truncate */
  53 } fp_rnd_t;
  54
  55 /*
  56  * FP precision modes
  57  */
  58 typedef enum {
  59         FP_PS=0,        /* 24 bit (single-precision) */
  60         FP_PRS,         /* reserved */
  61         FP_PD,          /* 53 bit (double-precision) */
  62         FP_PE           /* 64 bit (extended-precision) */
  63 } fp_prec_t;
  64
  65 #define fp_except_t     int
  66
  67 /*
  68  * FP exception masks
  69  */
  70 #define FP_X_INV        0x01    /* invalid operation */
  71 #define FP_X_DNML       0x02    /* denormal */
  72 #define FP_X_DZ         0x04    /* zero divide */
  73 #define FP_X_OFL        0x08    /* overflow */
  74 #define FP_X_UFL        0x10    /* underflow */
  75 #define FP_X_IMP        0x20    /* (im)precision */
  76 #define FP_X_STK        0x40    /* stack fault */
  77
  78 /*
  79  * FP registers
  80  */
  81 #define FP_MSKS_REG     0       /* exception masks */
  82 #define FP_PRC_REG      0       /* precision */
  83 #define FP_RND_REG      0       /* direction */
  84 #define FP_STKY_REG     1       /* sticky flags */
  85
  86 /*
  87  * FP register bit field masks
  88  */
  89 #define FP_MSKS_FLD     0x3f    /* exception masks field */
  90 #define FP_PRC_FLD      0x300   /* precision control field */
  91 #define FP_RND_FLD      0xc00   /* round control field */
  92 #define FP_STKY_FLD     0x3f    /* sticky flags field */
  93
  94 /*
  95  * FP register bit field offsets
  96  */
  97 #define FP_MSKS_OFF     0       /* exception masks offset */
  98 #define FP_PRC_OFF      8       /* precision control offset */
  99 #define FP_RND_OFF      10      /* round control offset */
 100 #define FP_STKY_OFF     0       /* sticky flags offset */
 101
 102 #endif /* !_CPU_IEEEFP_H_ */