The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/npx.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)npx.h 5.3 (Berkeley) 1/18/91
   37  * $FreeBSD: src/sys/i386/include/npx.h,v 1.10.4.1 1999/09/05 08:11:55 peter Exp $
   38  */
   39 
   40 /*
   41  * 287/387 NPX Coprocessor Data Structures and Constants
   42  * W. Jolitz 1/90
   43  */
   44 
   45 #ifndef _MACHINE_NPX_H_
   46 #define _MACHINE_NPX_H_
   47 
   48 /* Environment information of floating point unit */
   49 struct  env87 {
   50         long    en_cw;          /* control word (16bits) */
   51         long    en_sw;          /* status word (16bits) */
   52         long    en_tw;          /* tag word (16bits) */
   53         long    en_fip;         /* floating point instruction pointer */
   54         u_short en_fcs;         /* floating code segment selector */
   55         u_short en_opcode;      /* opcode last executed (11 bits ) */
   56         long    en_foo;         /* floating operand offset */
   57         long    en_fos;         /* floating operand segment selector */
   58 };
   59 
   60 /* Contents of each floating point accumulator */
   61 struct  fpacc87 {
   62 #ifdef dontdef /* too unportable */
   63         u_long  fp_mantlo;      /* mantissa low (31:0) */
   64         u_long  fp_manthi;      /* mantissa high (63:32) */
   65         int     fp_exp:15;      /* exponent */
   66         int     fp_sgn:1;       /* mantissa sign */
   67 #else
   68         u_char  fp_bytes[10];
   69 #endif
   70 };
   71 
   72 /* Floating point context */
   73 struct  save87 {
   74         struct  env87 sv_env;   /* floating point control/status */
   75         struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
   76         u_long  sv_ex_sw;       /* status word for last exception */
   77         /*
   78          * Bogus padding for emulators.  Emulators should use their own
   79          * struct and arrange to store into this struct (ending here)
   80          * before it is inspected for ptracing or for core dumps.  Some
   81          * emulators overwrite the whole struct.  We have no good way of
   82          * knowing how much padding to leave.  Leave just enough for the
   83          * GPL emulator's i387_union (176 bytes total).
   84          */
   85         u_char  sv_pad[64];     /* padding; used by emulators */
   86 };
   87 
   88 /* Intel prefers long real (53 bit) precision */
   89 #define __iBCS_NPXCW__          0x262
   90 /* wfj prefers temporary real (64 bit) precision */
   91 #define __386BSD_NPXCW__        0x362
   92 /*
   93  * bde prefers 53 bit precision and all exceptions masked.
   94  *
   95  * The standard control word from finit is 0x37F, giving:
   96  *
   97  *      round to nearest
   98  *      64-bit precision
   99  *      all exceptions masked.
  100  *
  101  * Now I want:
  102  *
  103  *      affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
  104  *      53-bit precision (2 in bitfield 3<<8)
  105  *      overflow exception unmasked (0 in bitfield 1<<3)
  106  *      zero divide exception unmasked (0 in bitfield 1<<2)
  107  *      invalid-operand exception unmasked (0 in bitfield 1<<0).
  108  *
  109  * 64-bit precision often gives bad results with high level languages
  110  * because it makes the results of calculations depend on whether
  111  * intermediate values are stored in memory or in FPU registers.
  112  *
  113  * The "Intel" and wfj control words have:
  114  *
  115  *      underflow exception unmasked (0 in bitfield 1<<4)
  116  *
  117  * but that causes an unexpected exception in the test program 'paranoia'
  118  * and makes denormals useless (DBL_MIN / 2 underflows).  It doesn't make
  119  * a lot of sense to trap underflow without trapping denormals.
  120  *
  121  * Later I will want the IEEE default of all exceptions masked.  See the
  122  * 0.0 math manpage for why this is better.  The 0.1 math manpage is empty.
  123  */
  124 #define __BDE_NPXCW__           0x1272
  125 #define __BETTER_BDE_NPXCW__    0x127f
  126 
  127 #ifdef __BROKEN_NPXCW__
  128 #ifdef __FreeBSD__
  129 #define __INITIAL_NPXCW__       __386BSD_NPXCW__
  130 #else
  131 #define __INITIAL_NPXCW__       __iBCS_NPXCW__
  132 #endif
  133 #else
  134 #define __INITIAL_NPXCW__       __BDE_NPXCW__
  135 #endif
  136 
  137 #ifdef KERNEL
  138 #include <sys/cdefs.h>
  139 #include <machine/frame.h>
  140 
  141 struct proc;
  142 
  143 int     npxdna __P((void));
  144 void    npxexit __P((struct proc *p));
  145 void    npxinit __P((int control));
  146 void    npxsave __P((struct save87 *addr));
  147 #endif
  148 
  149 #endif /* !_MACHINE_NPX_H_ */

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