FreeBSD/Linux Kernel Cross Reference
sys/i386/include/npx.h
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: releng/8.4/sys/i386/include/npx.h 237009 2012-06-13 15:25:52Z jhb $
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 */
45 struct 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 */
57 struct 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 */
69 struct 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
84 struct 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 control/status register */
96 u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */
97 };
98
99 /* Contents of each SSE extended accumulator */
100 struct xmmacc {
101 u_char xmm_bytes[16];
102 };
103
104 /* Contents of the upper 16 bytes of each AVX extended accumulator */
105 struct ymmacc {
106 uint8_t ymm_bytes[16];
107 };
108
109 struct savexmm {
110 struct envxmm sv_env;
111 struct {
112 struct fpacc87 fp_acc;
113 u_char fp_pad[6]; /* padding */
114 } sv_fp[8];
115 struct xmmacc sv_xmm[8];
116 u_char sv_pad[224];
117 } __aligned(16);
118
119 union savefpu {
120 struct save87 sv_87;
121 struct savexmm sv_xmm;
122 };
123
124 struct xstate_hdr {
125 uint64_t xstate_bv;
126 uint8_t xstate_rsrv0[16];
127 uint8_t xstate_rsrv[40];
128 };
129
130 struct savexmm_xstate {
131 struct xstate_hdr sx_hd;
132 struct ymmacc sx_ymm[16];
133 };
134
135 struct savexmm_ymm {
136 struct envxmm sv_env;
137 struct {
138 struct fpacc87 fp_acc;
139 int8_t fp_pad[6]; /* padding */
140 } sv_fp[8];
141 struct xmmacc sv_xmm[16];
142 uint8_t sv_pad[96];
143 struct savexmm_xstate sv_xstate;
144 } __aligned(64);
145
146 /*
147 * The hardware default control word for i387's and later coprocessors is
148 * 0x37F, giving:
149 *
150 * round to nearest
151 * 64-bit precision
152 * all exceptions masked.
153 *
154 * We modify the affine mode bit and precision bits in this to give:
155 *
156 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
157 * 53-bit precision (2 in bitfield 3<<8)
158 *
159 * 64-bit precision often gives bad results with high level languages
160 * because it makes the results of calculations depend on whether
161 * intermediate values are stored in memory or in FPU registers.
162 */
163 #define __INITIAL_NPXCW__ 0x127F
164 #define __INITIAL_MXCSR__ 0x1F80
165
166 #ifdef _KERNEL
167
168 #define PCB_USER_FPU(pcb) (((pcb)->pcb_flags & PCB_KERNNPX) == 0)
169
170 int npxdna(void);
171 void npxdrop(void);
172 void npxexit(struct thread *td);
173 int npxformat(void);
174 int npxgetregs(struct thread *td);
175 void npxinit(void);
176 void npxsave(union savefpu *addr);
177 void npxsetregs(struct thread *td, union savefpu *addr);
178 int npxtrap(void);
179 void npxuserinited(struct thread *);
180 struct fpu_kern_ctx *fpu_kern_alloc_ctx(u_int flags);
181 void fpu_kern_free_ctx(struct fpu_kern_ctx *ctx);
182 int fpu_kern_enter(struct thread *td, struct fpu_kern_ctx *ctx,
183 u_int flags);
184 int fpu_kern_leave(struct thread *td, struct fpu_kern_ctx *ctx);
185 int fpu_kern_thread(u_int flags);
186 int is_fpu_kern_thread(u_int flags);
187
188 /*
189 * Flags for fpu_kern_enter() and fpu_kern_thread().
190 */
191 #define FPU_KERN_NORMAL 0x0000
192 #define FPU_KERN_NOWAIT 0x0001
193
194 #endif
195
196 #endif /* !_MACHINE_NPX_H_ */
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