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Annotation of Net2/arch/i386/include/npx.h, revision 1.1

1.1     ! root        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:  *     @(#)npx.h       5.3 (Berkeley) 1/18/91
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * 287/387 NPX Coprocessor Data Structures and Constants
        !            41:  * W. Jolitz 1/90
        !            42:  */
        !            43: 
        !            44: #ifndef        ___NPX87___
        !            45: #define        ___NPX87___
        !            46: 
        !            47: /* Environment information of floating point unit */
        !            48: struct env87 {
        !            49:        long    en_cw;          /* control word (16bits) */
        !            50:        long    en_sw;          /* status word (16bits) */
        !            51:        long    en_tw;          /* tag word (16bits) */
        !            52:        long    en_fip;         /* floating point instruction pointer */
        !            53:        u_short en_fcs;         /* floating code segment selector */
        !            54:        u_short en_opcode;      /* opcode last executed (11 bits ) */
        !            55:        long    en_foo;         /* floating operand offset */
        !            56:        long    en_fos;         /* floating operand segment selector */
        !            57: };
        !            58: 
        !            59: /* Contents of each floating point accumulator */
        !            60: struct fpacc87 {
        !            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: };
        !            66: 
        !            67: /* Floating point context */
        !            68: struct save87 {
        !            69:        struct  env87 sv_env;           /* floating point control/status */
        !            70:        struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
        !            71: };
        !            72: 
        !            73: /* Cyrix EMC memory - mapped coprocessor context switch information */
        !            74: struct emcsts {
        !            75:        long    em_msw;         /* memory mapped status register when swtched */
        !            76:        long    em_tar;         /* memory mapped temp A register when swtched */
        !            77:        long    em_dl;          /* memory mapped D low register when swtched */
        !            78: };
        !            79: #endif ___NPX87___

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