2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
36 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91
37 * $FreeBSD: src/sys/i386/include/npx.h,v 1.18.2.1 2001/08/15 01:23:52 peter Exp $
38 * $DragonFly: src/sys/cpu/i386/include/npx.h,v 1.7 2004/05/05 19:26:42 dillon Exp $
42 * 287/387 NPX Coprocessor Data Structures and Constants
46 #ifndef _MACHINE_NPX_H_
47 #define _MACHINE_NPX_H_
49 /* Environment information of floating point unit */
51 long en_cw; /* control word (16bits) */
52 long en_sw; /* status word (16bits) */
53 long en_tw; /* tag word (16bits) */
54 long en_fip; /* floating point instruction pointer */
55 u_short en_fcs; /* floating code segment selector */
56 u_short en_opcode; /* opcode last executed (11 bits ) */
57 long en_foo; /* floating operand offset */
58 long en_fos; /* floating operand segment selector */
61 /* Contents of each floating point accumulator */
63 #ifdef dontdef /* too unportable */
64 u_long fp_mantlo; /* mantissa low (31:0) */
65 u_long fp_manthi; /* mantissa high (63:32) */
66 int fp_exp:15; /* exponent */
67 int fp_sgn:1; /* mantissa sign */
73 /* Floating point context */
75 struct env87 sv_env; /* floating point control/status */
76 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
77 u_long sv_ex_sw; /* status word for last exception */
79 * Bogus padding for emulators. Emulators should use their own
80 * struct and arrange to store into this struct (ending here)
81 * before it is inspected for ptracing or for core dumps. Some
82 * emulators overwrite the whole struct. We have no good way of
83 * knowing how much padding to leave. Leave just enough for the
84 * GPL emulator's i387_union (176 bytes total).
86 u_char sv_pad[64]; /* padding; used by emulators */
90 u_int16_t en_cw; /* control word (16bits) */
91 u_int16_t en_sw; /* status word (16bits) */
92 u_int16_t en_tw; /* tag word (16bits) */
93 u_int16_t en_opcode; /* opcode last executed (11 bits ) */
94 u_int32_t en_fip; /* floating point instruction pointer */
95 u_int16_t en_fcs; /* floating code segment selector */
96 u_int16_t en_pad0; /* padding */
97 u_int32_t en_foo; /* floating operand offset */
98 u_int16_t en_fos; /* floating operand segment selector */
99 u_int16_t en_pad1; /* padding */
100 u_int32_t en_mxcsr; /* SSE sontorol/status register */
101 u_int32_t en_pad2; /* padding */
104 /* Contents of each SSE extended accumulator */
106 u_char xmm_bytes[16];
110 struct envxmm sv_env;
112 struct fpacc87 fp_acc;
113 u_char fp_pad[6]; /* padding */
115 struct xmmacc sv_xmm[8];
116 u_long sv_ex_sw; /* status word for last exception */
118 } __attribute__((aligned(16)));
122 struct savexmm sv_xmm;
126 * The hardware default control word for i387's and later coprocessors is
131 * all exceptions masked.
133 * We modify the affine mode bit and precision bits in this to give:
135 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
136 * 53-bit precision (2 in bitfield 3<<8)
138 * 64-bit precision often gives bad results with high level languages
139 * because it makes the results of calculations depend on whether
140 * intermediate values are stored in memory or in FPU registers.
142 #define __INITIAL_NPXCW__ 0x127F
147 void npxexit (struct proc *p);
148 void npxinit (u_short control);
149 void npxsave (union savefpu *addr);
152 #endif /* !_MACHINE_NPX_H_ */