2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91
37 * $FreeBSD: src/sys/amd64/include/fpu.h,v 1.32 2004/01/28 23:55:58 peter Exp $
38 * $DragonFly: src/sys/amd64/include/Attic/fpu.h,v 1.1 2004/02/02 08:05:52 dillon Exp $
42 * Floating Point Data Structures and Constants
46 #ifndef _MACHINE_FPU_H_
47 #define _MACHINE_FPU_H_
49 /* Contents of each x87 floating point accumulator */
54 /* Contents of each SSE extended accumulator */
60 u_int16_t en_cw; /* control word (16bits) */
61 u_int16_t en_sw; /* status word (16bits) */
62 u_int8_t en_tw; /* tag word (8bits) */
64 u_int16_t en_opcode; /* opcode last executed (11 bits ) */
65 u_int64_t en_rip; /* floating point instruction pointer */
66 u_int64_t en_rdp; /* floating operand pointer */
67 u_int32_t en_mxcsr; /* SSE sontorol/status register */
68 u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */
74 struct fpacc87 fp_acc;
75 u_char fp_pad[6]; /* padding */
77 struct xmmacc sv_xmm[16];
82 * The hardware default control word for i387's and later coprocessors is
87 * all exceptions masked.
89 * FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc
90 * because of the difference between memory and fpu register stack arguments.
91 * If its using an intermediate fpu register, it has 80/64 bits to work
92 * with. If it uses memory, it has 64/53 bits to work with. However,
93 * gcc is aware of this and goes to a fair bit of trouble to make the
96 * This is mostly academic for AMD64, because the ABI prefers the use
97 * SSE2 based math. For FreeBSD/amd64, we go with the default settings.
99 #define __INITIAL_FPUCW__ 0x037F
100 #define __INITIAL_MXCSR__ 0x1F80
101 #define __INITIAL_MXCSR_MASK__ 0xFFBF
106 void fpuexit(struct thread *td);
108 int fpugetregs(struct thread *td, struct savefpu *addr);
110 void fpusetregs(struct thread *td, struct savefpu *addr);
114 #endif /* !_MACHINE_FPU_H_ */