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 | |
Andre Przywara | 5afaa1f | 2014-11-14 15:54:11 +0000 | [diff] [blame] | 24 | #define ARM64_WORKAROUND_CLEAN_CACHE 0 |
| 25 | #define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1 |
Will Deacon | 905e8c5 | 2015-03-23 19:07:02 +0000 | [diff] [blame] | 26 | #define ARM64_WORKAROUND_845719 2 |
Marc Zyngier | 94a9e04 | 2015-06-12 12:06:36 +0100 | [diff] [blame] | 27 | #define ARM64_HAS_SYSREG_GIC_CPUIF 3 |
James Morse | 338d4f4 | 2015-07-22 19:05:54 +0100 | [diff] [blame] | 28 | #define ARM64_HAS_PAN 4 |
Will Deacon | c739dc8 | 2015-07-27 14:11:55 +0100 | [diff] [blame] | 29 | #define ARM64_HAS_LSE_ATOMICS 5 |
Andre Przywara | 301bcfa | 2014-11-14 15:54:10 +0000 | [diff] [blame] | 30 | |
Will Deacon | d964b72 | 2015-02-04 12:17:55 +0000 | [diff] [blame] | 31 | #define ARM64_NCAPS 6 |
Andre Przywara | 301bcfa | 2014-11-14 15:54:10 +0000 | [diff] [blame] | 32 | |
| 33 | #ifndef __ASSEMBLY__ |
Andre Przywara | 930da09 | 2014-11-14 15:54:07 +0000 | [diff] [blame] | 34 | |
Will Deacon | 144e969 | 2015-04-30 18:55:50 +0100 | [diff] [blame] | 35 | #include <linux/kernel.h> |
| 36 | |
Marc Zyngier | 359b706 | 2015-03-27 13:09:23 +0000 | [diff] [blame] | 37 | struct arm64_cpu_capabilities { |
| 38 | const char *desc; |
| 39 | u16 capability; |
| 40 | bool (*matches)(const struct arm64_cpu_capabilities *); |
James Morse | 1c07630 | 2015-07-21 13:23:28 +0100 | [diff] [blame] | 41 | void (*enable)(void); |
Marc Zyngier | 359b706 | 2015-03-27 13:09:23 +0000 | [diff] [blame] | 42 | union { |
| 43 | struct { /* To be used for erratum handling only */ |
| 44 | u32 midr_model; |
| 45 | u32 midr_range_min, midr_range_max; |
| 46 | }; |
Marc Zyngier | 94a9e04 | 2015-06-12 12:06:36 +0100 | [diff] [blame] | 47 | |
| 48 | struct { /* Feature register checking */ |
James Morse | 18ffa04 | 2015-07-21 13:23:29 +0100 | [diff] [blame] | 49 | int field_pos; |
| 50 | int min_field_value; |
Marc Zyngier | 94a9e04 | 2015-06-12 12:06:36 +0100 | [diff] [blame] | 51 | }; |
Marc Zyngier | 359b706 | 2015-03-27 13:09:23 +0000 | [diff] [blame] | 52 | }; |
| 53 | }; |
| 54 | |
Fabio Estevam | 06f9eb8 | 2014-12-04 01:17:01 +0000 | [diff] [blame] | 55 | extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); |
Andre Przywara | 930da09 | 2014-11-14 15:54:07 +0000 | [diff] [blame] | 56 | |
Ard Biesheuvel | 3be1a5c | 2014-03-04 01:10:04 +0000 | [diff] [blame] | 57 | static inline bool cpu_have_feature(unsigned int num) |
| 58 | { |
| 59 | return elf_hwcap & (1UL << num); |
| 60 | } |
| 61 | |
Andre Przywara | 930da09 | 2014-11-14 15:54:07 +0000 | [diff] [blame] | 62 | static inline bool cpus_have_cap(unsigned int num) |
| 63 | { |
Fabio Estevam | 06f9eb8 | 2014-12-04 01:17:01 +0000 | [diff] [blame] | 64 | if (num >= ARM64_NCAPS) |
Andre Przywara | 930da09 | 2014-11-14 15:54:07 +0000 | [diff] [blame] | 65 | return false; |
| 66 | return test_bit(num, cpu_hwcaps); |
| 67 | } |
| 68 | |
| 69 | static inline void cpus_set_cap(unsigned int num) |
| 70 | { |
Fabio Estevam | 06f9eb8 | 2014-12-04 01:17:01 +0000 | [diff] [blame] | 71 | if (num >= ARM64_NCAPS) |
Andre Przywara | 930da09 | 2014-11-14 15:54:07 +0000 | [diff] [blame] | 72 | pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n", |
Fabio Estevam | 06f9eb8 | 2014-12-04 01:17:01 +0000 | [diff] [blame] | 73 | num, ARM64_NCAPS); |
Andre Przywara | 930da09 | 2014-11-14 15:54:07 +0000 | [diff] [blame] | 74 | else |
| 75 | __set_bit(num, cpu_hwcaps); |
| 76 | } |
| 77 | |
James Morse | 79b0e09 | 2015-07-21 13:23:26 +0100 | [diff] [blame] | 78 | static inline int __attribute_const__ cpuid_feature_extract_field(u64 features, |
| 79 | int field) |
| 80 | { |
| 81 | return (s64)(features << (64 - 4 - field)) >> (64 - 4); |
| 82 | } |
| 83 | |
| 84 | |
Marc Zyngier | 359b706 | 2015-03-27 13:09:23 +0000 | [diff] [blame] | 85 | void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps, |
| 86 | const char *info); |
Andre Przywara | e116a37 | 2014-11-14 15:54:09 +0000 | [diff] [blame] | 87 | void check_local_cpu_errata(void); |
Marc Zyngier | 359b706 | 2015-03-27 13:09:23 +0000 | [diff] [blame] | 88 | void check_local_cpu_features(void); |
Suzuki K. Poulose | 04597a6 | 2015-01-21 12:43:09 +0000 | [diff] [blame] | 89 | bool cpu_supports_mixed_endian_el0(void); |
| 90 | bool system_supports_mixed_endian_el0(void); |
Andre Przywara | e116a37 | 2014-11-14 15:54:09 +0000 | [diff] [blame] | 91 | |
Andre Przywara | 301bcfa | 2014-11-14 15:54:10 +0000 | [diff] [blame] | 92 | #endif /* __ASSEMBLY__ */ |
| 93 | |
Ard Biesheuvel | 3be1a5c | 2014-03-04 01:10:04 +0000 | [diff] [blame] | 94 | #endif |