1 /*
2 * Copyright (C) 2022 Tino Reichardt <milky-zfs@mcmilk.de>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 /*
30 * SIMD support:
31 *
32 * Following functions should be called to determine whether CPU feature
33 * is supported. All functions are usable in kernel and user space.
34 * If a SIMD algorithm is using more than one instruction set
35 * all relevant feature test functions should be called.
36 *
37 * Supported features:
38 * zfs_neon_available()
39 * zfs_sha256_available()
40 * zfs_sha512_available()
41 */
42
43 #ifndef _FREEBSD_SIMD_AARCH64_H
44 #define _FREEBSD_SIMD_AARCH64_H
45
46 #include <sys/types.h>
47 #include <sys/ucontext.h>
48 #include <machine/elf.h>
49 #include <machine/fpu.h>
50 #include <machine/md_var.h>
51 #include <machine/pcb.h>
52
53 #ifdef _STANDALONE
54
55 #define kfpu_allowed() 0
56 #define kfpu_begin() do {} while (0)
57 #define kfpu_end() do {} while (0)
58
59 #else
60
61 #define kfpu_allowed() 1
62 #define kfpu_begin() do { \
63 if (__predict_false(!is_fpu_kern_thread(0))) \
64 fpu_kern_enter(curthread, NULL, FPU_KERN_NOCTX); \
65 } while (0)
66
67 #define kfpu_end() do { \
68 if (__predict_false(curthread->td_pcb->pcb_fpflags & PCB_FP_NOSAVE)) \
69 fpu_kern_leave(curthread, NULL); \
70 } while (0)
71
72 #endif
73
74 #define kfpu_initialize(tsk) do {} while (0)
75 #define kfpu_init() (0)
76 #define kfpu_fini() do {} while (0)
77
78 /*
79 * Check if NEON is available
80 */
81 static inline boolean_t
zfs_neon_available(void)82 zfs_neon_available(void)
83 {
84 return (elf_hwcap & HWCAP_FP);
85 }
86
87 /*
88 * Check if SHA256 is available
89 */
90 static inline boolean_t
zfs_sha256_available(void)91 zfs_sha256_available(void)
92 {
93 return (elf_hwcap & HWCAP_SHA2);
94 }
95
96 /*
97 * Check if SHA512 is available
98 */
99 static inline boolean_t
zfs_sha512_available(void)100 zfs_sha512_available(void)
101 {
102 return (elf_hwcap & HWCAP_SHA512);
103 }
104
105 #endif /* _FREEBSD_SIMD_AARCH64_H */
106