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  * 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 /* Environment information of floating point unit */
   45 struct env87 {
   46         long    en_cw;          /* control word (16bits) */
   47         long    en_sw;          /* status word (16bits) */
   48         long    en_tw;          /* tag word (16bits) */
   49         long    en_fip;         /* floating point instruction pointer */
   50         u_short en_fcs;         /* floating code segment selector */
   51         u_short en_opcode;      /* opcode last executed (11 bits ) */
   52         long    en_foo;         /* floating operand offset */
   53         long    en_fos;         /* floating operand segment selector */
   54 };
   55 
   56 /* Contents of each floating point accumulator */
   57 struct fpacc87 {
   58 #ifdef dontdef /* too unportable */
   59         u_long  fp_mantlo;      /* mantissa low (31:0) */
   60         u_long  fp_manthi;      /* mantissa high (63:32) */
   61         int     fp_exp:15;      /* exponent */
   62         int     fp_sgn:1;       /* mantissa sign */
   63 #else
   64         u_char  fp_bytes[10];
   65 #endif
   66 };
   67 
   68 /* Floating point context */
   69 struct save87 {
   70         struct  env87 sv_env;   /* floating point control/status */
   71         struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
   72         u_char  sv_pad0[4];     /* padding for (now unused) saved status word */
   73         /*
   74          * Bogus padding for emulators.  Emulators should use their own
   75          * struct and arrange to store into this struct (ending here)
   76          * before it is inspected for ptracing or for core dumps.  Some
   77          * emulators overwrite the whole struct.  We have no good way of
   78          * knowing how much padding to leave.  Leave just enough for the
   79          * GPL emulator's i387_union (176 bytes total).
   80          */
   81         u_char  sv_pad[64];     /* padding; used by emulators */
   82 };
   83 
   84 struct  envxmm {
   85         u_int16_t       en_cw;          /* control word (16bits) */
   86         u_int16_t       en_sw;          /* status word (16bits) */
   87         u_int16_t       en_tw;          /* tag word (16bits) */
   88         u_int16_t       en_opcode;      /* opcode last executed (11 bits ) */
   89         u_int32_t       en_fip;         /* floating point instruction pointer */
   90         u_int16_t       en_fcs;         /* floating code segment selector */
   91         u_int16_t       en_pad0;        /* padding */
   92         u_int32_t       en_foo;         /* floating operand offset */
   93         u_int16_t       en_fos;         /* floating operand segment selector */
   94         u_int16_t       en_pad1;        /* padding */
   95         u_int32_t       en_mxcsr;       /* SSE control/status register */
   96         u_int32_t       en_mxcsr_mask;  /* valid bits in mxcsr */
   97 };
   98 
   99 /* Contents of each SSE extended accumulator */
  100 struct  xmmacc {
  101         u_char  xmm_bytes[16];
  102 };
  103 
  104 struct  savexmm {
  105         struct  envxmm  sv_env;
  106         struct {
  107                 struct fpacc87  fp_acc;
  108                 u_char          fp_pad[6];      /* padding */
  109         } sv_fp[8];
  110         struct xmmacc   sv_xmm[8];
  111         u_char sv_pad[224];
  112 } __aligned(16);
  113 
  114 union   savefpu {
  115         struct  save87  sv_87;
  116         struct  savexmm sv_xmm;
  117 };
  118 
  119 /*
  120  * The hardware default control word for i387's and later coprocessors is
  121  * 0x37F, giving:
  122  *
  123  *      round to nearest
  124  *      64-bit precision
  125  *      all exceptions masked.
  126  *
  127  * We modify the affine mode bit and precision bits in this to give:
  128  *
  129  *      affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
  130  *      53-bit precision (2 in bitfield 3<<8)
  131  *
  132  * 64-bit precision often gives bad results with high level languages
  133  * because it makes the results of calculations depend on whether
  134  * intermediate values are stored in memory or in FPU registers.
  135  */
  136 #define __INITIAL_NPXCW__       0x127F
  137 #define __INITIAL_MXCSR__       0x1F80
  138 
  139 #ifdef _KERNEL
  140 
  141 #define IO_NPX          0x0F0           /* Numeric Coprocessor */
  142 #define IO_NPXSIZE      16              /* 80387/80487 NPX registers */
  143 
  144 #define IRQ_NPX         13
  145 
  146 /* full reset on some systems, NOP on others */
  147 #define npx_full_reset() outb(IO_NPX + 1, 0)
  148 
  149 int     npxdna(void);
  150 void    npxdrop(void);
  151 void    npxexit(struct thread *td);
  152 int     npxformat(void);
  153 int     npxgetregs(struct thread *td, union savefpu *addr);
  154 void    npxinit(u_short control);
  155 void    npxsave(union savefpu *addr);
  156 void    npxsetregs(struct thread *td, union savefpu *addr);
  157 int     npxtrap(void);
  158 
  159 #endif
  160 
  161 #endif /* !_MACHINE_NPX_H_ */

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