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/amd64/include/fpu.h,v 1.33 2004/04/05 21:25:51 imp Exp $
34 */
35
36 /*
37 * Floating Point Data Structures and Constants
38 * W. Jolitz 1/90
39 */
40
41 #ifndef _MACHINE_FPU_H_
42 #define _MACHINE_FPU_H_
43
44 /* Contents of each x87 floating point accumulator */
45 struct fpacc87 {
46 u_char fp_bytes[10];
47 };
48
49 /* Contents of each SSE extended accumulator */
50 struct xmmacc {
51 u_char xmm_bytes[16];
52 };
53
54 struct envxmm {
55 u_int16_t en_cw; /* control word (16bits) */
56 u_int16_t en_sw; /* status word (16bits) */
57 u_int8_t en_tw; /* tag word (8bits) */
58 u_int8_t en_zero;
59 u_int16_t en_opcode; /* opcode last executed (11 bits ) */
60 u_int64_t en_rip; /* floating point instruction pointer */
61 u_int64_t en_rdp; /* floating operand pointer */
62 u_int32_t en_mxcsr; /* SSE sontorol/status register */
63 u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */
64 };
65
66 struct savefpu {
67 struct envxmm sv_env;
68 struct {
69 struct fpacc87 fp_acc;
70 u_char fp_pad[6]; /* padding */
71 } sv_fp[8];
72 struct xmmacc sv_xmm[16];
73 u_char sv_pad[96];
74 } __aligned(16);
75
76 /*
77 * The hardware default control word for i387's and later coprocessors is
78 * 0x37F, giving:
79 *
80 * round to nearest
81 * 64-bit precision
82 * all exceptions masked.
83 *
84 * FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc
85 * because of the difference between memory and fpu register stack arguments.
86 * If its using an intermediate fpu register, it has 80/64 bits to work
87 * with. If it uses memory, it has 64/53 bits to work with. However,
88 * gcc is aware of this and goes to a fair bit of trouble to make the
89 * best use of it.
90 *
91 * This is mostly academic for AMD64, because the ABI prefers the use
92 * SSE2 based math. For FreeBSD/amd64, we go with the default settings.
93 */
94 #define __INITIAL_FPUCW__ 0x037F
95 #define __INITIAL_MXCSR__ 0x1F80
96 #define __INITIAL_MXCSR_MASK__ 0xFFBF
97
98 #ifdef _KERNEL
99 int fpudna(void);
100 void fpudrop(void);
101 void fpuexit(struct thread *td);
102 int fpuformat(void);
103 int fpugetregs(struct thread *td, struct savefpu *addr);
104 void fpuinit(void);
105 void fpusetregs(struct thread *td, struct savefpu *addr);
106 int fputrap(void);
107 #endif
108
109 #endif /* !_MACHINE_FPU_H_ */
110 Cache object: d2bb8fa7462284c18c871cf618d3dcbf
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