projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 930da09f AP |
24 | #define NCAPS 0 |
| 25 | ||
| 26 | extern DECLARE_BITMAP(cpu_hwcaps, NCAPS); | |
| 27 | ||
| 3be1a5c4 AB |
28 | static inline bool cpu_have_feature(unsigned int num) |
| 29 | { | |
| 30 | return elf_hwcap & (1UL << num); | |
| 31 | } | |
| 32 | ||
| 930da09f AP |
33 | static inline bool cpus_have_cap(unsigned int num) |
| 34 | { | |
| 35 | if (num >= NCAPS) | |
| 36 | return false; | |
| 37 | return test_bit(num, cpu_hwcaps); | |
| 38 | } | |
| 39 | ||
| 40 | static inline void cpus_set_cap(unsigned int num) | |
| 41 | { | |
| 42 | if (num >= NCAPS) | |
| 43 | pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n", | |
| 44 | num, NCAPS); | |
| 45 | else | |
| 46 | __set_bit(num, cpu_hwcaps); | |
| 47 | } | |
| 48 | ||
| 3be1a5c4 | 49 | #endif |