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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 | ||
5afaa1fc AP |
24 | #define ARM64_WORKAROUND_CLEAN_CACHE 0 |
25 | #define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1 | |
301bcfac | 26 | |
06f9eb88 | 27 | #define ARM64_NCAPS 2 |
301bcfac AP |
28 | |
29 | #ifndef __ASSEMBLY__ | |
930da09f | 30 | |
06f9eb88 | 31 | extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); |
930da09f | 32 | |
3be1a5c4 AB |
33 | static inline bool cpu_have_feature(unsigned int num) |
34 | { | |
35 | return elf_hwcap & (1UL << num); | |
36 | } | |
37 | ||
930da09f AP |
38 | static inline bool cpus_have_cap(unsigned int num) |
39 | { | |
06f9eb88 | 40 | if (num >= ARM64_NCAPS) |
930da09f AP |
41 | return false; |
42 | return test_bit(num, cpu_hwcaps); | |
43 | } | |
44 | ||
45 | static inline void cpus_set_cap(unsigned int num) | |
46 | { | |
06f9eb88 | 47 | if (num >= ARM64_NCAPS) |
930da09f | 48 | pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n", |
06f9eb88 | 49 | num, ARM64_NCAPS); |
930da09f AP |
50 | else |
51 | __set_bit(num, cpu_hwcaps); | |
52 | } | |
53 | ||
e116a375 AP |
54 | void check_local_cpu_errata(void); |
55 | ||
301bcfac AP |
56 | #endif /* __ASSEMBLY__ */ |
57 | ||
3be1a5c4 | 58 | #endif |