1 /* $NetBSD: cpufeature.h,v 1.9 2021/12/19 11:52:47 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifndef _LINUX_ASM_CPUFEATURE_H_
33 #define _LINUX_ASM_CPUFEATURE_H_
34
35 #include <sys/cpu.h>
36
37 #if defined(__i386__) || defined(__x86_64__)
38
39 #include <x86/specialreg.h>
40
41 #define cpu_has_clflush ((cpu_info_primary.ci_feat_val[0] & CPUID_CLFSH) != 0)
42 #define cpu_has_pat ((cpu_info_primary.ci_feat_val[0] & CPUID_PAT) != 0)
43
44 #define X86_FEATURE_CLFLUSH 0
45 #define X86_FEATURE_PAT 1
46
47 static inline bool
static_cpu_has(int feature)48 static_cpu_has(int feature)
49 {
50 switch (feature) {
51 case X86_FEATURE_CLFLUSH:
52 return cpu_has_clflush;
53 case X86_FEATURE_PAT:
54 return cpu_has_pat;
55 default:
56 return false;
57 }
58 }
59
60 #define boot_cpu_has static_cpu_has
61
62 static inline size_t
cache_line_size(void)63 cache_line_size(void)
64 {
65 return cpu_info_primary.ci_cflush_lsize;
66 }
67
68 static inline void
clflush(const void * p)69 clflush(const void *p)
70 {
71 asm volatile ("clflush %0" : : "m" (*(const char *)p));
72 }
73
74 #endif /* x86 */
75
76 #endif /* _LINUX_ASM_CPUFEATURE_H_ */
77