headers/posix/arch/x86/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  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      from: @(#)npx.h 5.3 (Berkeley) 1/18/91
  33  * $FreeBSD$
  34  */
  35
  36 /*
  37  * 287/387 NPX Coprocessor Data Structures and Constants
  38  * W. Jolitz 1/90
  39  */
  40
  41 #ifndef _MACHINE_NPX_H_
  42 #define _MACHINE_NPX_H_
  43
  44 #define __aligned(x)    __attribute__((__aligned__(x)))
  45
  46 /* Environment information of floating point unit */
  47 struct env87 {
  48         long    en_cw;          /* control word (16bits) */
  49         long    en_sw;          /* status word (16bits) */
  50         long    en_tw;          /* tag word (16bits) */
  51         long    en_fip;         /* floating point instruction pointer */
  52         u_short en_fcs;         /* floating code segment selector */
  53         u_short en_opcode;      /* opcode last executed (11 bits ) */
  54         long    en_foo;         /* floating operand offset */
  55         long    en_fos;         /* floating operand segment selector */
  56 };
  57
  58 /* Contents of each floating point accumulator */
  59 struct fpacc87 {
  60 #ifdef dontdef /* too unportable */
  61         u_long  fp_mantlo;      /* mantissa low (31:0) */
  62         u_long  fp_manthi;      /* mantissa high (63:32) */
  63         int     fp_exp:15;      /* exponent */
  64         int     fp_sgn:1;       /* mantissa sign */
  65 #else
  66         u_char  fp_bytes[10];
  67 #endif
  68 };
  69
  70 /* Floating point context */
  71 struct save87 {
  72         struct  env87 sv_env;   /* floating point control/status */
  73         struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
  74         u_char  sv_pad0[4];     /* padding for (now unused) saved status word */
  75         /*
  76          * Bogus padding for emulators.  Emulators should use their own
  77          * struct and arrange to store into this struct (ending here)
  78          * before it is inspected for ptracing or for core dumps.  Some
  79          * emulators overwrite the whole struct.  We have no good way of
  80          * knowing how much padding to leave.  Leave just enough for the
  81          * GPL emulator's i387_union (176 bytes total).
  82          */
  83         u_char  sv_pad[64];     /* padding; used by emulators */
  84 };
  85
  86 struct  envxmm {
  87         uint16  en_cw;          /* control word (16bits) */
  88         uint16  en_sw;          /* status word (16bits) */
  89         uint16  en_tw;          /* tag word (16bits) */
  90         uint16  en_opcode;      /* opcode last executed (11 bits ) */
  91         uint32  en_fip;         /* floating point instruction pointer */
  92         uint16  en_fcs;         /* floating code segment selector */
  93         uint16  en_pad0;        /* padding */
  94         uint32  en_foo;         /* floating operand offset */
  95         uint16  en_fos;         /* floating operand segment selector */
  96         uint16  en_pad1;        /* padding */
  97         uint32  en_mxcsr;       /* SSE control/status register */
  98         uint32  en_mxcsr_mask;  /* valid bits in mxcsr */
  99 };
 100
 101 /* Contents of each SSE extended accumulator */
 102 struct  xmmacc {
 103         u_char  xmm_bytes[16];
 104 };
 105
 106 struct  savexmm {
 107         struct  envxmm  sv_env;
 108         struct {
 109                 struct fpacc87  fp_acc;
 110                 u_char          fp_pad[6];      /* padding */
 111         } sv_fp[8];
 112         struct xmmacc   sv_xmm[8];
 113         u_char sv_pad[224];
 114 } __aligned(16);
 115
 116 union   savefpu {
 117         struct  save87  sv_87;
 118         struct  savexmm sv_xmm;
 119 };
 120
 121 /*
 122  * The hardware default control word for i387's and later coprocessors is
 123  * 0x37F, giving:
 124  *
 125  *      round to nearest
 126  *      64-bit precision
 127  *      all exceptions masked.
 128  *
 129  * We modify the affine mode bit and precision bits in this to give:
 130  *
 131  *      affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
 132  *      53-bit precision (2 in bitfield 3<<8)
 133  *
 134  * 64-bit precision often gives bad results with high level languages
 135  * because it makes the results of calculations depend on whether
 136  * intermediate values are stored in memory or in FPU registers.
 137  */
 138 #define __INITIAL_NPXCW__       0x127F
 139 #define __INITIAL_MXCSR__       0x1F80
 140
 141 #ifdef _KERNEL
 142
 143 #define IO_NPX          0x0F0           /* Numeric Coprocessor */
 144 #define IO_NPXSIZE      16              /* 80387/80487 NPX registers */
 145
 146 #define IRQ_NPX         13
 147
 148 /* full reset on some systems, NOP on others */
 149 #define npx_full_reset() outb(IO_NPX + 1, 0)
 150
 151 int     npxdna(void);
 152 void    npxdrop(void);
 153 void    npxexit(struct thread *td);
 154 int     npxformat(void);
 155 int     npxgetregs(struct thread *td, union savefpu *addr);
 156 void    npxinit(void);
 157 void    npxsave(union savefpu *addr);
 158 void    npxsetregs(struct thread *td, union savefpu *addr);
 159 int     npxtrap(void);
 160
 161 #endif
 162
 163 #endif /* !_MACHINE_NPX_H_ */