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 * $FreeBSD$
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#define __aligned(x)    __attribute__((__aligned__(x)))
45
46/* Environment information of floating point unit */
47struct env87 {
48	long	en_cw;		/* control word (16bits) */
49	long	en_sw;		/* status word (16bits) */
50	long	en_tw;		/* tag word (16bits) */
51	long	en_fip;		/* floating point instruction pointer */
52	u_short	en_fcs;		/* floating code segment selector */
53	u_short	en_opcode;	/* opcode last executed (11 bits ) */
54	long	en_foo;		/* floating operand offset */
55	long	en_fos;		/* floating operand segment selector */
56};
57
58/* Contents of each floating point accumulator */
59struct fpacc87 {
60#ifdef dontdef /* too unportable */
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#else
66	u_char	fp_bytes[10];
67#endif
68};
69
70/* Floating point context */
71struct save87 {
72	struct	env87 sv_env;	/* floating point control/status */
73	struct	fpacc87	sv_ac[8];	/* accumulator contents, 0-7 */
74	u_char	sv_pad0[4];	/* padding for (now unused) saved status word */
75	/*
76	 * Bogus padding for emulators.  Emulators should use their own
77	 * struct and arrange to store into this struct (ending here)
78	 * before it is inspected for ptracing or for core dumps.  Some
79	 * emulators overwrite the whole struct.  We have no good way of
80	 * knowing how much padding to leave.  Leave just enough for the
81	 * GPL emulator's i387_union (176 bytes total).
82	 */
83	u_char	sv_pad[64];	/* padding; used by emulators */
84};
85
86struct  envxmm {
87	uint16	en_cw;		/* control word (16bits) */
88	uint16	en_sw;		/* status word (16bits) */
89	uint16	en_tw;		/* tag word (16bits) */
90	uint16	en_opcode;	/* opcode last executed (11 bits ) */
91	uint32	en_fip;		/* floating point instruction pointer */
92	uint16	en_fcs;		/* floating code segment selector */
93	uint16	en_pad0;	/* padding */
94	uint32	en_foo;		/* floating operand offset */
95	uint16	en_fos;		/* floating operand segment selector */
96	uint16	en_pad1;	/* padding */
97	uint32	en_mxcsr;	/* SSE control/status register */
98	uint32	en_mxcsr_mask;	/* valid bits in mxcsr */
99};
100
101/* Contents of each SSE extended accumulator */
102struct  xmmacc {
103	u_char	xmm_bytes[16];
104};
105
106struct  savexmm {
107	struct	envxmm	sv_env;
108	struct {
109		struct fpacc87	fp_acc;
110		u_char		fp_pad[6];      /* padding */
111	} sv_fp[8];
112	struct xmmacc	sv_xmm[8];
113	u_char sv_pad[224];
114} __aligned(16);
115
116union	savefpu {
117	struct	save87	sv_87;
118	struct	savexmm	sv_xmm;
119};
120
121/*
122 * The hardware default control word for i387's and later coprocessors is
123 * 0x37F, giving:
124 *
125 *	round to nearest
126 *	64-bit precision
127 *	all exceptions masked.
128 *
129 * We modify the affine mode bit and precision bits in this to give:
130 *
131 *	affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
132 *	53-bit precision (2 in bitfield 3<<8)
133 *
134 * 64-bit precision often gives bad results with high level languages
135 * because it makes the results of calculations depend on whether
136 * intermediate values are stored in memory or in FPU registers.
137 */
138#define	__INITIAL_NPXCW__	0x127F
139#define	__INITIAL_MXCSR__	0x1F80
140
141#ifdef _KERNEL
142
143#define	IO_NPX		0x0F0		/* Numeric Coprocessor */
144#define	IO_NPXSIZE	16		/* 80387/80487 NPX registers */
145
146#define	IRQ_NPX		13
147
148/* full reset on some systems, NOP on others */
149#define npx_full_reset() outb(IO_NPX + 1, 0)
150
151int	npxdna(void);
152void	npxdrop(void);
153void	npxexit(struct thread *td);
154int	npxformat(void);
155int	npxgetregs(struct thread *td, union savefpu *addr);
156void	npxinit(void);
157void	npxsave(union savefpu *addr);
158void	npxsetregs(struct thread *td, union savefpu *addr);
159int	npxtrap(void);
160
161#endif
162
163#endif /* !_MACHINE_NPX_H_ */
164