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
30