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 | ||
5afaa1fc AP |
24 | #define ARM64_WORKAROUND_CLEAN_CACHE 0 |
25 | #define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1 | |
905e8c5d | 26 | #define ARM64_WORKAROUND_845719 2 |
301bcfac | 27 | |
905e8c5d | 28 | #define ARM64_NCAPS 3 |
301bcfac AP |
29 | |
30 | #ifndef __ASSEMBLY__ | |
930da09f | 31 | |
359b7064 MZ |
32 | struct arm64_cpu_capabilities { |
33 | const char *desc; | |
34 | u16 capability; | |
35 | bool (*matches)(const struct arm64_cpu_capabilities *); | |
36 | union { | |
37 | struct { /* To be used for erratum handling only */ | |
38 | u32 midr_model; | |
39 | u32 midr_range_min, midr_range_max; | |
40 | }; | |
41 | }; | |
42 | }; | |
43 | ||
06f9eb88 | 44 | extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); |
930da09f | 45 | |
3be1a5c4 AB |
46 | static inline bool cpu_have_feature(unsigned int num) |
47 | { | |
48 | return elf_hwcap & (1UL << num); | |
49 | } | |
50 | ||
930da09f AP |
51 | static inline bool cpus_have_cap(unsigned int num) |
52 | { | |
06f9eb88 | 53 | if (num >= ARM64_NCAPS) |
930da09f AP |
54 | return false; |
55 | return test_bit(num, cpu_hwcaps); | |
56 | } | |
57 | ||
58 | static inline void cpus_set_cap(unsigned int num) | |
59 | { | |
06f9eb88 | 60 | if (num >= ARM64_NCAPS) |
930da09f | 61 | pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n", |
06f9eb88 | 62 | num, ARM64_NCAPS); |
930da09f AP |
63 | else |
64 | __set_bit(num, cpu_hwcaps); | |
65 | } | |
66 | ||
359b7064 MZ |
67 | void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps, |
68 | const char *info); | |
e116a375 | 69 | void check_local_cpu_errata(void); |
359b7064 | 70 | void check_local_cpu_features(void); |
04597a65 SP |
71 | bool cpu_supports_mixed_endian_el0(void); |
72 | bool system_supports_mixed_endian_el0(void); | |
e116a375 | 73 | |
301bcfac AP |
74 | #endif /* __ASSEMBLY__ */ |
75 | ||
3be1a5c4 | 76 | #endif |