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Annotation of Net2/arch/i386/include/npx.h, revision 1.1.1.1

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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