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3be1a5c4 AB |
1 | /* |
2 | * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #ifndef __ASM_CPUFEATURE_H | |
10 | #define __ASM_CPUFEATURE_H | |
11 | ||
12 | #include <asm/hwcap.h> | |
13 | ||
14 | /* | |
15 | * In the arm64 world (as in the ARM world), elf_hwcap is used both internally | |
16 | * in the kernel and for user space to keep track of which optional features | |
17 | * are supported by the current system. So let's map feature 'x' to HWCAP_x. | |
18 | * Note that HWCAP_x constants are bit fields so we need to take the log. | |
19 | */ | |
20 | ||
21 | #define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap)) | |
22 | #define cpu_feature(x) ilog2(HWCAP_ ## x) | |
23 | ||
24 | static inline bool cpu_have_feature(unsigned int num) | |
25 | { | |
26 | return elf_hwcap & (1UL << num); | |
27 | } | |
28 | ||
29 | #endif |