Ard Biesheuvel | 3be1a5c | 2014-03-04 01:10:04 +0000 | [diff] [blame] | 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 |