1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/* $OpenBSD: npx.h,v 1.12 2010/06/29 21:13:43 thib Exp $ */
/* $NetBSD: npx.h,v 1.11 1994/10/27 04:16:11 cgd Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)npx.h 5.3 (Berkeley) 1/18/91
*/
/*
* 287/387 NPX Coprocessor Data Structures and Constants
* W. Jolitz 1/90
*/
#ifndef _I386_NPX_H_
#define _I386_NPX_H_
/* Environment information of floating point unit */
struct env87 {
long en_cw; /* control word (16bits) */
long en_sw; /* status word (16bits) */
long en_tw; /* tag word (16bits) */
long en_fip; /* floating point instruction pointer */
u_short en_fcs; /* floating code segment selector */
u_short en_opcode; /* opcode last executed (11 bits ) */
long en_foo; /* floating operand offset */
long en_fos; /* floating operand segment selector */
};
#define EN_SW_IE 0x0001 /* invalid operation */
#define EN_SW_DE 0x0002 /* denormal */
#define EN_SW_ZE 0x0004 /* divide by zero */
#define EN_SW_OE 0x0008 /* overflow */
#define EN_SW_UE 0x0010 /* underflow */
#define EN_SW_PE 0x0020 /* loss of precision */
/* Contents of each floating point accumulator */
struct fpacc87 {
#ifdef dontdef /* too unportable */
u_long fp_mantlo; /* mantissa low (31:0) */
u_long fp_manthi; /* mantissa high (63:32) */
int fp_exp:15; /* exponent */
int fp_sgn:1; /* mantissa sign */
#else
u_char fp_bytes[10];
#endif
};
/* Floating point and emulator context */
struct save87 {
struct env87 sv_env; /* floating point control/status */
struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
u_long sv_ex_sw; /* status word for last exception */
u_long sv_ex_tw; /* tag word for last exception */
};
/* Environment of FPU/MMX/SSE/SSE2. */
struct envxmm {
/*0*/ uint16_t en_cw; /* FPU Control Word */
uint16_t en_sw; /* FPU Status Word */
uint8_t en_tw; /* FPU Tag Word (abridged) */
uint8_t en_rsvd0;
uint16_t en_opcode; /* FPU Opcode */
uint32_t en_fip; /* FPU Instruction Pointer */
uint16_t en_fcs; /* FPU IP selector */
uint16_t en_rsvd1;
/*16*/ uint32_t en_foo; /* FPU Data pointer */
uint16_t en_fos; /* FPU Data pointer selector */
uint16_t en_rsvd2;
uint32_t en_mxcsr; /* MXCSR Register State */
uint32_t en_rsvd3;
};
/* FPU regsters in the extended save format. */
struct fpaccxmm {
uint8_t fp_bytes[10];
uint8_t fp_rsvd[6];
};
/* SSE/SSE2 registers. */
struct xmmreg {
uint8_t sse_bytes[16];
};
/* FPU/MMX/SSE/SSE2 context */
struct savexmm {
struct envxmm sv_env; /* control/status context */
struct fpaccxmm sv_ac[8]; /* ST/MM regs */
struct xmmreg sv_xmmregs[8]; /* XMM regs */
uint8_t sv_rsvd[16 * 14];
/* 512-bytes --- end of hardware portion of save area */
uint32_t sv_ex_sw; /* saved SW from last exception */
uint32_t sv_ex_tw; /* saved TW from last exception */
};
union savefpu {
struct save87 sv_87;
struct savexmm sv_xmm;
};
/* Cyrix EMC memory - mapped coprocessor context switch information */
struct emcsts {
long em_msw; /* memory mapped status register when swtched */
long em_tar; /* memory mapped temp A register when swtched */
long em_dl; /* memory mapped D low register when swtched */
};
/* Intel prefers long real (53 bit) precision */
#define __iBCS_NPXCW__ 0x262
#define __BDE_NPXCW__ 0x1272 /* FreeBSD */
#define __OpenBSD_NPXCW__ 0x37f
/*
* The default MXCSR value at reset is 0x1f80, IA-32 Instruction
* Set Reference, pg. 3-369.
*/
#define __INITIAL_MXCSR__ 0x1f80
/*
* The standard control word from finit is 0x37F, giving:
* round to nearest
* 64-bit precision
* all exceptions masked.
*
* The iBCS control word has underflow, overflow, zero divide, and invalid
* operation exceptions unmasked. But that causes an unexpected exception
* in the test program 'paranoia' and makes denormals useless (DBL_MIN / 2
* underflows). It doesn't make a lot of sense to trap underflow without
* trapping denormals.
*/
#define __INITIAL_NPXCW__ __OpenBSD_NPXCW__
void process_xmm_to_s87(const struct savexmm *, struct save87 *);
void process_s87_to_xmm(const struct save87 *, struct savexmm *);
struct cpu_info;
struct trapframe;
void npxinit(struct cpu_info *);
void npxtrap(struct trapframe *);
void fpu_kernel_enter(void);
void fpu_kernel_exit(void);
#endif /* !_I386_NPX_H_ */
|
