1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 2003 Peter Wemm.
5 * Copyright (c) 1990 Andrew Moore, Talke Studio
6 * All rights reserved.
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 * 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.
23 *
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
34 * SUCH DAMAGE.
35 */
36
37#ifndef _MACHINE_IEEEFP_H_
38#define _MACHINE_IEEEFP_H_
39
40/* Deprecated historical FPU control interface */
41
42#include <x86/x86_ieeefp.h>
43
44static __inline fp_rnd_t
45fpgetround(void)
46{
47	unsigned short _cw;
48
49	__fnstcw(&_cw);
50	return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF));
51}
52
53static __inline fp_rnd_t
54fpsetround(fp_rnd_t _m)
55{
56	fp_rnd_t _p;
57	unsigned short _cw, _newcw;
58
59	__fnstcw(&_cw);
60	_p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF);
61	_newcw = _cw & ~FP_RND_FLD;
62	_newcw |= (_m << FP_RND_OFF) & FP_RND_FLD;
63	__fnldcw(_cw, _newcw);
64	return (_p);
65}
66
67static __inline fp_prec_t
68fpgetprec(void)
69{
70	unsigned short _cw;
71
72	__fnstcw(&_cw);
73	return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF));
74}
75
76static __inline fp_prec_t
77fpsetprec(fp_prec_t _m)
78{
79	fp_prec_t _p;
80	unsigned short _cw, _newcw;
81
82	__fnstcw(&_cw);
83	_p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF);
84	_newcw = _cw & ~FP_PRC_FLD;
85	_newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD;
86	__fnldcw(_cw, _newcw);
87	return (_p);
88}
89
90/*
91 * Get or set the exception mask.
92 * Note that the x87 mask bits are inverted by the API -- a mask bit of 1
93 * means disable for x87 and SSE, but for fp*mask() it means enable.
94 */
95
96static __inline fp_except_t
97fpgetmask(void)
98{
99	unsigned short _cw;
100
101	__fnstcw(&_cw);
102	return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF);
103}
104
105static __inline fp_except_t
106fpsetmask(fp_except_t _m)
107{
108	fp_except_t _p;
109	unsigned short _cw, _newcw;
110
111	__fnstcw(&_cw);
112	_p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF;
113	_newcw = _cw & ~FP_MSKS_FLD;
114	_newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD;
115	__fnldcw(_cw, _newcw);
116	return (_p);
117}
118
119static __inline fp_except_t
120fpgetsticky(void)
121{
122	unsigned _ex;
123	unsigned short _sw;
124
125	__fnstsw(&_sw);
126	_ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF;
127	return ((fp_except_t)_ex);
128}
129
130static __inline fp_except_t
131fpresetsticky(fp_except_t _m)
132{
133	struct {
134		unsigned _cw;
135		unsigned _sw;
136		unsigned _other[5];
137	} _env;
138	fp_except_t _p;
139
140	_m &= FP_STKY_FLD >> FP_STKY_OFF;
141	_p = fpgetsticky();
142	if ((_p & ~_m) == _p)
143		return (_p);
144	if ((_p & ~_m) == 0) {
145		__fnclex();
146		return (_p);
147	}
148	__fnstenv(&_env);
149	_env._sw &= ~_m;
150	__fldenv(&_env);
151	return (_p);
152}
153
154#endif /* !_MACHINE_IEEEFP_H_ */
155