1 /* SPDX-License-Identifier: GPL-2.0-only */ 1
2 /*
3 * Copyright (C) 2017 Linaro Ltd. <ard.biesheu
4 */
5
6 #ifndef __ASM_CPUFEATURE_H
7 #define __ASM_CPUFEATURE_H
8
9 #include <linux/log2.h>
10 #include <asm/hwcap.h>
11
12 /*
13 * Due to the fact that ELF_HWCAP is a 32-bit
14 * of optional CPU features it defines, ARM's
15 * been distributed over separate elf_hwcap an
16 * which covers a subset of the available CPU
17 *
18 * Currently, only a few of those are suitable
19 * (which is the primary use case of this faci
20 * covered by HWCAP2. So let's only cover thos
21 * convenience macro for now (which is used by
22 * However, all capabilities are exposed via t
23 * using an explicit MODULE_DEVICE_TABLE() tha
24 */
25 #define MAX_CPU_FEATURES 64
26 #define __hwcap_feature(x) ilog2(HWCAP_ #
27 #define __hwcap2_feature(x) (32 + ilog2(HW
28 #define cpu_feature(x) __hwcap2_featu
29
30 static inline bool cpu_have_feature(unsigned i
31 {
32 return num < 32 ? elf_hwcap & BIT(num)
33 }
34
35 #endif
36
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