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 * 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.
19 *
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
30 * SUCH DAMAGE.
31 *
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 $
34 */
35
36/*
37 * 287/387 NPX Coprocessor Data Structures and Constants
38 * W. Jolitz 1/90
39 */
40
41#ifndef _MACHINE_NPX_H_
42#define	_MACHINE_NPX_H_
43
44/* Environment information of floating point unit */
45struct env87 {
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 */
54};
55
56/* Contents of each floating point accumulator */
57struct fpacc87 {
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 */
63#else
64	u_char	fp_bytes[10];
65#endif
66};
67
68/* Floating point context */
69struct save87 {
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 */
73	/*
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).
80	 */
81	u_char	sv_pad[64];	/* padding; used by emulators */
82};
83
84struct  envxmm {
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 */
97};
98
99/* Contents of each SSE extended accumulator */
100struct  xmmacc {
101	u_char	xmm_bytes[16];
102};
103
104struct  savexmm {
105	struct	envxmm	sv_env;
106	struct {
107		struct fpacc87	fp_acc;
108		u_char		fp_pad[6];      /* padding */
109	} sv_fp[8];
110	struct xmmacc	sv_xmm[8];
111	u_char sv_pad[224];
112} __aligned(16);
113
114union	savefpu {
115	struct	save87	sv_87;
116	struct	savexmm	sv_xmm;
117};
118
119/*
120 * The hardware default control word for i387's and later coprocessors is
121 * 0x37F, giving:
122 *
123 *	round to nearest
124 *	64-bit precision
125 *	all exceptions masked.
126 *
127 * We modify the affine mode bit and precision bits in this to give:
128 *
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)
131 *
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.
135 */
136#define	__INITIAL_NPXCW__	0x127F
137#define	__INITIAL_MXCSR__	0x1F80
138
139#ifdef _KERNEL
140
141#define	IO_NPX		0x0F0		/* Numeric Coprocessor */
142#define	IO_NPXSIZE	16		/* 80387/80487 NPX registers */
143
144#define	IRQ_NPX		13
145
146/* full reset on some systems, NOP on others */
147#define npx_full_reset() outb(IO_NPX + 1, 0)
148
149int	npxdna(void);
150void	npxdrop(void);
151void	npxexit(struct thread *td);
152int	npxformat(void);
153int	npxgetregs(struct thread *td, union savefpu *addr);
154void	npxinit(u_short control);
155void	npxsave(union savefpu *addr);
156void	npxsetregs(struct thread *td, union savefpu *addr);
157int	npxtrap(void);
158#endif
159
160#endif /* !_MACHINE_NPX_H_ */
161