usr/src/sys/i386/include/npx.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)npx.h       5.3 (Berkeley) 1/18/91
 */

/*
 * 287/387 NPX Coprocessor Data Structures and Constants
 * W. Jolitz 1/90
 */

#ifndef ___NPX87___
#define ___NPX87___

/* Environment information of floating point unit */
struct  env87 {
        long    en_cw;          /* control word (16bits) */
        long    en_sw;          /* status word (16bits) */
        long    en_tw;          /* tag word (16bits) */
        long    en_fip;         /* floating point instruction pointer */
        u_short en_fcs;         /* floating code segment selector */
        u_short en_opcode;      /* opcode last executed (11 bits ) */
        long    en_foo;         /* floating operand offset */
        long    en_fos;         /* floating operand segment selector */
};

/* Contents of each floating point accumulator */
struct  fpacc87 {
        u_long  fp_mantlo;      /* mantissa low (31:0) */
        u_long  fp_manthi;      /* mantissa high (63:32) */
        int     fp_exp:15;      /* exponent */
        int     fp_sgn:1;       /* mantissa sign */
};

/* Floating point context */
struct  save87 {
        struct  env87 sv_env;           /* floating point control/status */
        struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
};

/* Cyrix EMC memory - mapped coprocessor context switch information */
struct  emcsts {
        long    em_msw;         /* memory mapped status register when swtched */
        long    em_tar;         /* memory mapped temp A register when swtched */
        long    em_dl;          /* memory mapped D low register when swtched */
};
#endif  ___NPX87___