2 * Copyright (c) 1990 The Regents of the University of California.
3 * Copyright (c) 2008 The DragonFly Project.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91
38 * $FreeBSD: src/sys/i386/include/npx.h,v 1.18.2.1 2001/08/15 01:23:52 peter Exp $
42 * 287/387 NPX Coprocessor Data Structures and Constants
50 #include <sys/types.h>
53 /* Environment information of floating point unit */
55 int32_t en_cw; /* control word (16bits) */
56 int32_t en_sw; /* status word (16bits) */
57 int32_t en_tw; /* tag word (16bits) */
58 int32_t en_fip; /* floating point instruction pointer */
59 u_short en_fcs; /* floating code segment selector */
60 u_short en_opcode; /* opcode last executed (11 bits ) */
61 int32_t en_foo; /* floating operand offset */
62 int32_t en_fos; /* floating operand segment selector */
65 /* Contents of each floating point accumulator */
67 #ifdef dontdef /* too unportable */
68 u_int32_t fp_mantlo; /* mantissa low (31:0) */
69 u_int32_t fp_manthi; /* mantissa high (63:32) */
70 int fp_exp:15; /* exponent */
71 int fp_sgn:1; /* mantissa sign */
77 /* Floating point context */
79 struct env87 sv_env; /* floating point control/status */
80 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
81 u_int32_t sv_unused001;
83 * Bogus padding for emulators. Emulators should use their own
84 * struct and arrange to store into this struct (ending here)
85 * before it is inspected for ptracing or for core dumps. Some
86 * emulators overwrite the whole struct. We have no good way of
87 * knowing how much padding to leave. Leave just enough for the
88 * GPL emulator's i387_union (176 bytes total).
90 u_char sv_pad[64]; /* padding; used by emulators */
94 u_int16_t en_cw; /* control word (16bits) */
95 u_int16_t en_sw; /* status word (16bits) */
96 u_int16_t en_tw; /* tag word (16bits) */
97 u_int16_t en_opcode; /* opcode last executed (11 bits ) */
98 u_int32_t en_fip; /* floating point instruction pointer */
99 u_int16_t en_fcs; /* floating code segment selector */
100 u_int16_t en_pad0; /* padding */
101 u_int32_t en_foo; /* floating operand offset */
102 u_int16_t en_fos; /* floating operand segment selector */
103 u_int16_t en_pad1; /* padding */
104 u_int32_t en_mxcsr; /* SSE sontorol/status register */
105 u_int32_t en_pad2; /* padding */
108 /* Contents of each SSE extended accumulator */
110 u_char xmm_bytes[16];
114 * savexmm is a 512-byte structure
117 struct envxmm sv_env; /* 32 */
119 struct fpacc87 fp_acc; /* 10 */
120 u_char fp_pad[6]; /* 6 (padding) */
122 struct xmmacc sv_xmm[8]; /* 128 */
123 u_int32_t sv_unused001;
125 } __attribute__((aligned(16)));
129 struct savexmm sv_xmm;
133 * The hardware default control word for i387's and later coprocessors is
138 * all exceptions masked.
140 * We modify the affine mode bit and precision bits in this to give:
142 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
143 * 53-bit precision (2 in bitfield 3<<8)
145 * 64-bit precision often gives bad results with high level languages
146 * because it makes the results of calculations depend on whether
147 * intermediate values are stored in memory or in FPU registers.
149 #define __INITIAL_NPXCW__ 0x127F
151 #define __INITIAL_FPUCW__ 0x037F /* used by libm/arch/x86_64/fenv.c */
152 #define __INITIAL_FPUCW_I386__ 0x127F
153 #define __INITIAL_MXCSR__ 0x1F80 /* used by libm/arch/x86_64/fenv.c */
154 #define __INITIAL_MXCSR_MASK__ 0xFFBF
162 void npxinit (u_short control);
163 void npxsave (union savefpu *addr);
166 #endif /* !_CPU_NPX_H_ */