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
* 4. Neither the name of the University nor the names of its contributors
17
* may be used to endorse or promote products derived from this software
18
* without specific prior written permission.
20
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32
* from: @(#)npx.h 5.3 (Berkeley) 1/18/91
33
* $FreeBSD: src/sys/i386/include/npx.h,v 1.29.2.1 2006/07/01 00:57:55 davidxu Exp $
37
* 287/387 NPX Coprocessor Data Structures and Constants
41
#ifndef _MACHINE_NPX_H_
42
#define _MACHINE_NPX_H_
44
/* Environment information of floating point unit */
46
long en_cw; /* control word (16bits) */
47
long en_sw; /* status word (16bits) */
48
long en_tw; /* tag word (16bits) */
49
long en_fip; /* floating point instruction pointer */
50
u_short en_fcs; /* floating code segment selector */
51
u_short en_opcode; /* opcode last executed (11 bits ) */
52
long en_foo; /* floating operand offset */
53
long en_fos; /* floating operand segment selector */
56
/* Contents of each floating point accumulator */
58
#ifdef dontdef /* too unportable */
59
u_long fp_mantlo; /* mantissa low (31:0) */
60
u_long fp_manthi; /* mantissa high (63:32) */
61
int fp_exp:15; /* exponent */
62
int fp_sgn:1; /* mantissa sign */
68
/* Floating point context */
70
struct env87 sv_env; /* floating point control/status */
71
struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
72
u_char sv_pad0[4]; /* padding for (now unused) saved status word */
74
* Bogus padding for emulators. Emulators should use their own
75
* struct and arrange to store into this struct (ending here)
76
* before it is inspected for ptracing or for core dumps. Some
77
* emulators overwrite the whole struct. We have no good way of
78
* knowing how much padding to leave. Leave just enough for the
79
* GPL emulator's i387_union (176 bytes total).
81
u_char sv_pad[64]; /* padding; used by emulators */
85
u_int16_t en_cw; /* control word (16bits) */
86
u_int16_t en_sw; /* status word (16bits) */
87
u_int16_t en_tw; /* tag word (16bits) */
88
u_int16_t en_opcode; /* opcode last executed (11 bits ) */
89
u_int32_t en_fip; /* floating point instruction pointer */
90
u_int16_t en_fcs; /* floating code segment selector */
91
u_int16_t en_pad0; /* padding */
92
u_int32_t en_foo; /* floating operand offset */
93
u_int16_t en_fos; /* floating operand segment selector */
94
u_int16_t en_pad1; /* padding */
95
u_int32_t en_mxcsr; /* SSE sontorol/status register */
96
u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */
99
/* Contents of each SSE extended accumulator */
101
u_char xmm_bytes[16];
105
struct envxmm sv_env;
107
struct fpacc87 fp_acc;
108
u_char fp_pad[6]; /* padding */
110
struct xmmacc sv_xmm[8];
116
struct savexmm sv_xmm;
120
* The hardware default control word for i387's and later coprocessors is
125
* all exceptions masked.
127
* We modify the affine mode bit and precision bits in this to give:
129
* affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
130
* 53-bit precision (2 in bitfield 3<<8)
132
* 64-bit precision often gives bad results with high level languages
133
* because it makes the results of calculations depend on whether
134
* intermediate values are stored in memory or in FPU registers.
136
#define __INITIAL_NPXCW__ 0x127F
137
#define __INITIAL_MXCSR__ 0x1F80
141
#define IO_NPX 0x0F0 /* Numeric Coprocessor */
142
#define IO_NPXSIZE 16 /* 80387/80487 NPX registers */
146
/* full reset on some systems, NOP on others */
147
#define npx_full_reset() outb(IO_NPX + 1, 0)
151
void npxexit(struct thread *td);
153
int npxgetregs(struct thread *td, union savefpu *addr);
154
void npxinit(u_short control);
155
void npxsave(union savefpu *addr);
156
void npxsetregs(struct thread *td, union savefpu *addr);
160
#endif /* !_MACHINE_NPX_H_ */