1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2020 Greg V <[email protected]>
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 _LINUXKPI_ASM_FPU_API_H_
29 #define _LINUXKPI_ASM_FPU_API_H_
30
31 #if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
32
33 #include <machine/fpu.h>
34
35 extern struct fpu_kern_ctx *__lkpi_fpu_ctx;
36 extern unsigned int __lkpi_fpu_ctx_level;
37
38 static inline void
kernel_fpu_begin()39 kernel_fpu_begin()
40 {
41 if (__lkpi_fpu_ctx_level++ == 0) {
42 fpu_kern_enter(curthread, __lkpi_fpu_ctx, FPU_KERN_NORMAL);
43 }
44 }
45
46 static inline void
kernel_fpu_end()47 kernel_fpu_end()
48 {
49 if (--__lkpi_fpu_ctx_level == 0) {
50 fpu_kern_leave(curthread, __lkpi_fpu_ctx);
51 }
52 }
53
54 #else
55
56 static inline void
kernel_fpu_begin()57 kernel_fpu_begin()
58 {
59 }
60
61 static inline void
kernel_fpu_end()62 kernel_fpu_end()
63 {
64 }
65
66 #endif
67
68 #endif /* _LINUXKPI_ASM_FPU_API_H_ */
69