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