1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2020 Greg V <greg@unrelenting.technology>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef	_FPU_API_H_
29#define	_FPU_API_H_
30
31#if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
32
33#include <machine/fpu.h>
34
35extern struct fpu_kern_ctx *__lkpi_fpu_ctx;
36extern unsigned int __lkpi_fpu_ctx_level;
37
38static inline void
39kernel_fpu_begin()
40{
41	if (__lkpi_fpu_ctx_level++ == 0) {
42		fpu_kern_enter(curthread, __lkpi_fpu_ctx, FPU_KERN_NORMAL);
43	}
44}
45
46static inline void
47kernel_fpu_end()
48{
49	if (--__lkpi_fpu_ctx_level == 0) {
50		fpu_kern_leave(curthread, __lkpi_fpu_ctx);
51	}
52}
53
54#else
55
56static inline void
57kernel_fpu_begin()
58{
59}
60
61static inline void
62kernel_fpu_end()
63{
64}
65
66#endif
67
68#endif /* _FPU_API_H_ */
69