sys/cpu/i386/include/npx.h

   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 1.18.2.1 2001/08/15 01:23:52 peter Exp $
  38  * $DragonFly: src/sys/cpu/i386/include/npx.h,v 1.12 2007/01/09 23:34:01 dillon Exp $
  39  */
  40
  41 /*
  42  * 287/387 NPX Coprocessor Data Structures and Constants
  43  * W. Jolitz 1/90
  44  */
  45
  46 #ifndef _CPU_NPX_H_
  47 #define _CPU_NPX_H_
  48
  49 #ifndef _SYS_TYPES_H_
  50 #include <sys/types.h>
  51 #endif
  52
  53 /* Environment information of floating point unit */
  54 struct  env87 {
  55         long    en_cw;          /* control word (16bits) */
  56         long    en_sw;          /* status word (16bits) */
  57         long    en_tw;          /* tag word (16bits) */
  58         long    en_fip;         /* floating point instruction pointer */
  59         u_short en_fcs;         /* floating code segment selector */
  60         u_short en_opcode;      /* opcode last executed (11 bits ) */
  61         long    en_foo;         /* floating operand offset */
  62         long    en_fos;         /* floating operand segment selector */
  63 };
  64
  65 /* Contents of each floating point accumulator */
  66 struct  fpacc87 {
  67 #ifdef dontdef /* too unportable */
  68         u_long  fp_mantlo;      /* mantissa low (31:0) */
  69         u_long  fp_manthi;      /* mantissa high (63:32) */
  70         int     fp_exp:15;      /* exponent */
  71         int     fp_sgn:1;       /* mantissa sign */
  72 #else
  73         u_char  fp_bytes[10];
  74 #endif
  75 };
  76
  77 /* Floating point context */
  78 struct  save87 {
  79         struct  env87 sv_env;   /* floating point control/status */
  80         struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
  81         u_long  sv_ex_sw;       /* status word for last exception */
  82         /*
  83          * Bogus padding for emulators.  Emulators should use their own
  84          * struct and arrange to store into this struct (ending here)
  85          * before it is inspected for ptracing or for core dumps.  Some
  86          * emulators overwrite the whole struct.  We have no good way of
  87          * knowing how much padding to leave.  Leave just enough for the
  88          * GPL emulator's i387_union (176 bytes total).
  89          */
  90         u_char  sv_pad[64];     /* padding; used by emulators */
  91 };
  92
  93 struct  envxmm {
  94         u_int16_t       en_cw;          /* control word (16bits) */
  95         u_int16_t       en_sw;          /* status word (16bits) */
  96         u_int16_t       en_tw;          /* tag word (16bits) */
  97         u_int16_t       en_opcode;      /* opcode last executed (11 bits ) */
  98         u_int32_t       en_fip;         /* floating point instruction pointer */
  99         u_int16_t       en_fcs;         /* floating code segment selector */
 100         u_int16_t       en_pad0;        /* padding */
 101         u_int32_t       en_foo;         /* floating operand offset */
 102         u_int16_t       en_fos;         /* floating operand segment selector */
 103         u_int16_t       en_pad1;        /* padding */
 104         u_int32_t       en_mxcsr;       /* SSE sontorol/status register */
 105         u_int32_t       en_pad2;        /* padding */
 106 };
 107
 108 /* Contents of each SSE extended accumulator */
 109 struct  xmmacc {
 110         u_char  xmm_bytes[16];
 111 };
 112
 113 /*
 114  * savexmm is a 512-byte structure
 115  */
 116 struct  savexmm {
 117         struct  envxmm  sv_env;                 /* 32 */
 118         struct {
 119                 struct fpacc87  fp_acc;         /* 10 */
 120                 u_char          fp_pad[6];      /* 6  (padding) */
 121         } sv_fp[8];
 122         struct xmmacc   sv_xmm[8];              /* 128 */
 123         u_long sv_ex_sw;        /* status word for last exception */
 124         u_char sv_pad[220];
 125 } __attribute__((aligned(16)));
 126
 127 union   savefpu {
 128         struct  save87  sv_87;
 129         struct  savexmm sv_xmm;
 130 };
 131
 132 /*
 133  * The hardware default control word for i387's and later coprocessors is
 134  * 0x37F, giving:
 135  *
 136  *      round to nearest
 137  *      64-bit precision
 138  *      all exceptions masked.
 139  *
 140  * We modify the affine mode bit and precision bits in this to give:
 141  *
 142  *      affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
 143  *      53-bit precision (2 in bitfield 3<<8)
 144  *
 145  * 64-bit precision often gives bad results with high level languages
 146  * because it makes the results of calculations depend on whether
 147  * intermediate values are stored in memory or in FPU registers.
 148  */
 149 #define __INITIAL_NPXCW__       0x127F
 150
 151 #ifdef _KERNEL
 152
 153 struct proc;
 154 struct trapframe;
 155
 156 void    npxexit (void);
 157 void    npxinit (u_short control);
 158 void    npxsave (union savefpu *addr);
 159 #endif
 160
 161 #endif /* !_CPU_NPX_H_ */