1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2020 Val Packett <val@packett.cool>
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 #include <sys/types.h>
29 #include <sys/param.h>
30 #include <sys/proc.h>
31 #include <sys/kernel.h>
32 
33 #include <linux/sched.h>
34 
35 #include <asm/fpu/api.h>
36 
37 #if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
38 
39 #include <machine/fpu.h>
40 
41 /*
42  * Technically the Linux API isn't supposed to allow nesting sections
43  * either, but currently used versions of GPU drivers rely on nesting
44  * working, so we only enter the section on the outermost level.
45  */
46 
47 void
48 lkpi_kernel_fpu_begin(void)
49 {
50 	if ((current->fpu_ctx_level)++ == 0)
51 		fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX);
52 }
53 
54 void
55 lkpi_kernel_fpu_end(void)
56 {
57 	if (--(current->fpu_ctx_level) == 0)
58 		fpu_kern_leave(curthread, NULL);
59 }
60 
61 #else
62 
63 void
64 lkpi_kernel_fpu_begin(void)
65 {
66 }
67 
68 void
69 lkpi_kernel_fpu_end(void)
70 {
71 }
72 
73 #endif
74