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: releng/5.0/sys/i386/include/npx.h 103834 2002-09-23 05:55:10Z peter $
   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_char  sv_pad0[4];     /* padding for (now unused) saved status word */
   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 struct  envxmm {
   89         u_int16_t       en_cw;          /* control word (16bits) */
   90         u_int16_t       en_sw;          /* status word (16bits) */
   91         u_int16_t       en_tw;          /* tag word (16bits) */
   92         u_int16_t       en_opcode;      /* opcode last executed (11 bits ) */
   93         u_int32_t       en_fip;         /* floating point instruction pointer */
   94         u_int16_t       en_fcs;         /* floating code segment selector */
   95         u_int16_t       en_pad0;        /* padding */
   96         u_int32_t       en_foo;         /* floating operand offset */
   97         u_int16_t       en_fos;         /* floating operand segment selector */
   98         u_int16_t       en_pad1;        /* padding */
   99         u_int32_t       en_mxcsr;       /* SSE sontorol/status register */
  100         u_int32_t       en_pad2;        /* padding */
  101 };
  102 
  103 /* Contents of each SSE extended accumulator */
  104 struct  xmmacc {
  105         u_char  xmm_bytes[16];
  106 };
  107 
  108 struct  savexmm {
  109         struct  envxmm  sv_env;
  110         struct {
  111                 struct fpacc87  fp_acc;
  112                 u_char          fp_pad[6];      /* padding */
  113         } sv_fp[8];
  114         struct xmmacc   sv_xmm[8];
  115         u_char sv_pad[224];
  116 } __aligned(16);
  117 
  118 union   savefpu {
  119         struct  save87  sv_87;
  120         struct  savexmm sv_xmm;
  121 };
  122 
  123 /*
  124  * The hardware default control word for i387's and later coprocessors is
  125  * 0x37F, giving:
  126  *
  127  *      round to nearest
  128  *      64-bit precision
  129  *      all exceptions masked.
  130  *
  131  * We modify the affine mode bit and precision bits in this to give:
  132  *
  133  *      affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
  134  *      53-bit precision (2 in bitfield 3<<8)
  135  *
  136  * 64-bit precision often gives bad results with high level languages
  137  * because it makes the results of calculations depend on whether
  138  * intermediate values are stored in memory or in FPU registers.
  139  */
  140 #define __INITIAL_NPXCW__       0x127F
  141 
  142 #ifdef _KERNEL
  143 int     npxdna(void);
  144 void    npxdrop(void);
  145 void    npxexit(struct thread *td);
  146 int     npxformat(void);
  147 int     npxgetregs(struct thread *td, union savefpu *addr);
  148 void    npxinit(u_short control);
  149 void    npxsave(union savefpu *addr);
  150 void    npxsetregs(struct thread *td, union savefpu *addr);
  151 int     npxtrap(void);
  152 #endif
  153 
  154 #endif /* !_MACHINE_NPX_H_ */

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