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Ard Biesheuvel3be1a5c2014-03-04 01:10:04 +00001/*
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
24static inline bool cpu_have_feature(unsigned int num)
25{
26 return elf_hwcap & (1UL << num);
27}
28
29#endif