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  * $FreeBSD$
   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 #include <machine/globals.h>
   49 
   50 /* Environment information of floating point unit */
   51 struct  env87 {
   52         long    en_cw;          /* control word (16bits) */
   53         long    en_sw;          /* status word (16bits) */
   54         long    en_tw;          /* tag word (16bits) */
   55         long    en_fip;         /* floating point instruction pointer */
   56         u_short en_fcs;         /* floating code segment selector */
   57         u_short en_opcode;      /* opcode last executed (11 bits ) */
   58         long    en_foo;         /* floating operand offset */
   59         long    en_fos;         /* floating operand segment selector */
   60 };
   61 
   62 /* Contents of each floating point accumulator */
   63 struct  fpacc87 {
   64 #ifdef dontdef /* too unportable */
   65         u_long  fp_mantlo;      /* mantissa low (31:0) */
   66         u_long  fp_manthi;      /* mantissa high (63:32) */
   67         int     fp_exp:15;      /* exponent */
   68         int     fp_sgn:1;       /* mantissa sign */
   69 #else
   70         u_char  fp_bytes[10];
   71 #endif
   72 };
   73 
   74 /* Floating point context */
   75 struct  save87 {
   76         struct  env87 sv_env;   /* floating point control/status */
   77         struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
   78         u_long  sv_ex_sw;       /* status word for last exception */
   79         /*
   80          * Bogus padding for emulators.  Emulators should use their own
   81          * struct and arrange to store into this struct (ending here)
   82          * before it is inspected for ptracing or for core dumps.  Some
   83          * emulators overwrite the whole struct.  We have no good way of
   84          * knowing how much padding to leave.  Leave just enough for the
   85          * GPL emulator's i387_union (176 bytes total).
   86          */
   87         u_char  sv_pad[64];     /* padding; used by emulators */
   88 };
   89 
   90 struct  envxmm {
   91         u_int16_t       en_cw;          /* control word (16bits) */
   92         u_int16_t       en_sw;          /* status word (16bits) */
   93         u_int16_t       en_tw;          /* tag word (16bits) */
   94         u_int16_t       en_opcode;      /* opcode last executed (11 bits ) */
   95         u_int32_t       en_fip;         /* floating point instruction pointer */
   96         u_int16_t       en_fcs;         /* floating code segment selector */
   97         u_int16_t       en_pad0;        /* padding */
   98         u_int32_t       en_foo;         /* floating operand offset */
   99         u_int16_t       en_fos;         /* floating operand segment selector */
  100         u_int16_t       en_pad1;        /* padding */
  101         u_int32_t       en_mxcsr;       /* SSE sontorol/status register */
  102         u_int32_t       en_pad2;        /* padding */
  103 };
  104 
  105 /* Contents of each SSE extended accumulator */
  106 struct  xmmacc {
  107         u_char  xmm_bytes[16];
  108 };
  109 
  110 struct  savexmm {
  111         struct  envxmm  sv_env;
  112         struct {
  113                 struct fpacc87  fp_acc;
  114                 u_char          fp_pad[6];      /* padding */
  115         } sv_fp[8];
  116         struct xmmacc   sv_xmm[8];
  117         u_long sv_ex_sw;        /* status word for last exception */
  118         u_char sv_pad[220];
  119 } __attribute__((aligned(16)));
  120 
  121 union   savefpu {
  122         struct  save87  sv_87;
  123         struct  savexmm sv_xmm;
  124 };
  125 
  126 /*
  127  * The hardware default control word for i387's and later coprocessors is
  128  * 0x37F, giving:
  129  *
  130  *      round to nearest
  131  *      64-bit precision
  132  *      all exceptions masked.
  133  *
  134  * We modify the affine mode bit and precision bits in this to give:
  135  *
  136  *      affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
  137  *      53-bit precision (2 in bitfield 3<<8)
  138  *
  139  * 64-bit precision often gives bad results with high level languages
  140  * because it makes the results of calculations depend on whether
  141  * intermediate values are stored in memory or in FPU registers.
  142  */
  143 #define __INITIAL_NPXCW__       0x127F
  144 
  145 #ifdef _KERNEL
  146 #ifndef npxproc
  147 extern struct proc *npxproc;
  148 #endif
  149 
  150 int     npxdna __P((void));
  151 void    npxexit __P((struct proc *p));
  152 void    npxinit __P((int control));
  153 void    npxsave __P((union savefpu *addr));
  154 #endif
  155 
  156 #endif /* !_MACHINE_NPX_H_ */

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