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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
359b7064 MZ |
2 | /* |
3 | * Contains CPU feature definitions | |
4 | * | |
5 | * Copyright (C) 2015 ARM Ltd. | |
359b7064 MZ |
6 | */ |
7 | ||
9cdf8ec4 | 8 | #define pr_fmt(fmt) "CPU features: " fmt |
359b7064 | 9 | |
3c739b57 | 10 | #include <linux/bsearch.h> |
2a6dcb2b | 11 | #include <linux/cpumask.h> |
5ffdfaed | 12 | #include <linux/crash_dump.h> |
3c739b57 | 13 | #include <linux/sort.h> |
2a6dcb2b | 14 | #include <linux/stop_machine.h> |
359b7064 | 15 | #include <linux/types.h> |
2077be67 | 16 | #include <linux/mm.h> |
a111b7c0 | 17 | #include <linux/cpu.h> |
359b7064 MZ |
18 | #include <asm/cpu.h> |
19 | #include <asm/cpufeature.h> | |
dbb4e152 | 20 | #include <asm/cpu_ops.h> |
2e0f2478 | 21 | #include <asm/fpsimd.h> |
13f417f3 | 22 | #include <asm/mmu_context.h> |
338d4f49 | 23 | #include <asm/processor.h> |
cdcf817b | 24 | #include <asm/sysreg.h> |
77c97b4e | 25 | #include <asm/traps.h> |
d88701be | 26 | #include <asm/virt.h> |
359b7064 | 27 | |
aec0bff7 AM |
28 | /* Kernel representation of AT_HWCAP and AT_HWCAP2 */ |
29 | static unsigned long elf_hwcap __read_mostly; | |
9cdf8ec4 SP |
30 | |
31 | #ifdef CONFIG_COMPAT | |
32 | #define COMPAT_ELF_HWCAP_DEFAULT \ | |
33 | (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ | |
34 | COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ | |
7559950a | 35 | COMPAT_HWCAP_TLS|COMPAT_HWCAP_IDIV|\ |
9cdf8ec4 SP |
36 | COMPAT_HWCAP_LPAE) |
37 | unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; | |
38 | unsigned int compat_elf_hwcap2 __read_mostly; | |
39 | #endif | |
40 | ||
41 | DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); | |
4b65a5db | 42 | EXPORT_SYMBOL(cpu_hwcaps); |
82a3a21b | 43 | static struct arm64_cpu_capabilities const __ro_after_init *cpu_hwcaps_ptrs[ARM64_NCAPS]; |
9cdf8ec4 | 44 | |
0ceb0d56 DT |
45 | /* Need also bit for ARM64_CB_PATCH */ |
46 | DECLARE_BITMAP(boot_capabilities, ARM64_NPATCHABLE); | |
47 | ||
09e3c22a MB |
48 | bool arm64_use_ng_mappings = false; |
49 | EXPORT_SYMBOL(arm64_use_ng_mappings); | |
50 | ||
8f1eec57 DM |
51 | /* |
52 | * Flag to indicate if we have computed the system wide | |
53 | * capabilities based on the boot time active CPUs. This | |
54 | * will be used to determine if a new booting CPU should | |
55 | * go through the verification process to make sure that it | |
56 | * supports the system capabilities, without using a hotplug | |
b51c6ac2 SP |
57 | * notifier. This is also used to decide if we could use |
58 | * the fast path for checking constant CPU caps. | |
8f1eec57 | 59 | */ |
b51c6ac2 SP |
60 | DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready); |
61 | EXPORT_SYMBOL(arm64_const_caps_ready); | |
62 | static inline void finalize_system_capabilities(void) | |
8f1eec57 | 63 | { |
b51c6ac2 | 64 | static_branch_enable(&arm64_const_caps_ready); |
8f1eec57 DM |
65 | } |
66 | ||
8effeaaf MR |
67 | static int dump_cpu_hwcaps(struct notifier_block *self, unsigned long v, void *p) |
68 | { | |
69 | /* file-wide pr_fmt adds "CPU features: " prefix */ | |
70 | pr_emerg("0x%*pb\n", ARM64_NCAPS, &cpu_hwcaps); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static struct notifier_block cpu_hwcaps_notifier = { | |
75 | .notifier_call = dump_cpu_hwcaps | |
76 | }; | |
77 | ||
78 | static int __init register_cpu_hwcaps_dumper(void) | |
79 | { | |
80 | atomic_notifier_chain_register(&panic_notifier_list, | |
81 | &cpu_hwcaps_notifier); | |
82 | return 0; | |
83 | } | |
84 | __initcall(register_cpu_hwcaps_dumper); | |
85 | ||
efd9e03f CM |
86 | DEFINE_STATIC_KEY_ARRAY_FALSE(cpu_hwcap_keys, ARM64_NCAPS); |
87 | EXPORT_SYMBOL(cpu_hwcap_keys); | |
88 | ||
fe4fbdbc | 89 | #define __ARM64_FTR_BITS(SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ |
3c739b57 | 90 | { \ |
4f0a606b | 91 | .sign = SIGNED, \ |
fe4fbdbc | 92 | .visible = VISIBLE, \ |
3c739b57 SP |
93 | .strict = STRICT, \ |
94 | .type = TYPE, \ | |
95 | .shift = SHIFT, \ | |
96 | .width = WIDTH, \ | |
97 | .safe_val = SAFE_VAL, \ | |
98 | } | |
99 | ||
0710cfdb | 100 | /* Define a feature with unsigned values */ |
fe4fbdbc SP |
101 | #define ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ |
102 | __ARM64_FTR_BITS(FTR_UNSIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) | |
4f0a606b | 103 | |
0710cfdb | 104 | /* Define a feature with a signed value */ |
fe4fbdbc SP |
105 | #define S_ARM64_FTR_BITS(VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \ |
106 | __ARM64_FTR_BITS(FTR_SIGNED, VISIBLE, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) | |
0710cfdb | 107 | |
3c739b57 SP |
108 | #define ARM64_FTR_END \ |
109 | { \ | |
110 | .width = 0, \ | |
111 | } | |
112 | ||
70544196 JM |
113 | /* meta feature for alternatives */ |
114 | static bool __maybe_unused | |
92406f0c SP |
115 | cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused); |
116 | ||
5ffdfaed | 117 | static void cpu_enable_cnp(struct arm64_cpu_capabilities const *cap); |
70544196 | 118 | |
3ff047f6 ADK |
119 | static bool __system_matches_cap(unsigned int n); |
120 | ||
4aa8a472 SP |
121 | /* |
122 | * NOTE: Any changes to the visibility of features should be kept in | |
123 | * sync with the documentation of the CPU feature register ABI. | |
124 | */ | |
5e49d73c | 125 | static const struct arm64_ftr_bits ftr_id_aa64isar0[] = { |
1a50ec0b | 126 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RNDR_SHIFT, 4, 0), |
7206dc93 | 127 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TS_SHIFT, 4, 0), |
3b3b6810 | 128 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_FHM_SHIFT, 4, 0), |
5bdecb79 SP |
129 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_DP_SHIFT, 4, 0), |
130 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SM4_SHIFT, 4, 0), | |
131 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SM3_SHIFT, 4, 0), | |
132 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA3_SHIFT, 4, 0), | |
133 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RDM_SHIFT, 4, 0), | |
fe4fbdbc SP |
134 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_ATOMICS_SHIFT, 4, 0), |
135 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_CRC32_SHIFT, 4, 0), | |
136 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA2_SHIFT, 4, 0), | |
137 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_SHA1_SHIFT, 4, 0), | |
138 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_AES_SHIFT, 4, 0), | |
3c739b57 SP |
139 | ARM64_FTR_END, |
140 | }; | |
141 | ||
c8c3798d | 142 | static const struct arm64_ftr_bits ftr_id_aa64isar1[] = { |
d4209d8b SP |
143 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_I8MM_SHIFT, 4, 0), |
144 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_DGH_SHIFT, 4, 0), | |
145 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_BF16_SHIFT, 4, 0), | |
146 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_SPECRES_SHIFT, 4, 0), | |
bd4fb6d2 | 147 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_SB_SHIFT, 4, 0), |
7230f7e9 | 148 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_FRINTTS_SHIFT, 4, 0), |
6984eb47 MR |
149 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), |
150 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_GPI_SHIFT, 4, 0), | |
151 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), | |
152 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_GPA_SHIFT, 4, 0), | |
5bdecb79 SP |
153 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_LRCPC_SHIFT, 4, 0), |
154 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_FCMA_SHIFT, 4, 0), | |
155 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_JSCVT_SHIFT, 4, 0), | |
6984eb47 MR |
156 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), |
157 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_API_SHIFT, 4, 0), | |
158 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), | |
159 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_APA_SHIFT, 4, 0), | |
5bdecb79 | 160 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR1_DPB_SHIFT, 4, 0), |
c8c3798d SP |
161 | ARM64_FTR_END, |
162 | }; | |
163 | ||
5e49d73c | 164 | static const struct arm64_ftr_bits ftr_id_aa64pfr0[] = { |
179a56f6 | 165 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV3_SHIFT, 4, 0), |
0f15adbb | 166 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_CSV2_SHIFT, 4, 0), |
7206dc93 | 167 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_DIT_SHIFT, 4, 0), |
2c9d45b4 | 168 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_AMU_SHIFT, 4, 0), |
3fab3999 DM |
169 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
170 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_SVE_SHIFT, 4, 0), | |
64c02720 | 171 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_RAS_SHIFT, 4, 0), |
5bdecb79 | 172 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_GIC_SHIFT, 4, 0), |
fe4fbdbc SP |
173 | S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_ASIMD_SHIFT, 4, ID_AA64PFR0_ASIMD_NI), |
174 | S_ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR0_FP_SHIFT, 4, ID_AA64PFR0_FP_NI), | |
5bdecb79 | 175 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL3_SHIFT, 4, 0), |
98448cdf WD |
176 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL2_SHIFT, 4, 0), |
177 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_SHIFT, 4, ID_AA64PFR0_EL1_64BIT_ONLY), | |
178 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL0_SHIFT, 4, ID_AA64PFR0_EL0_64BIT_ONLY), | |
3c739b57 SP |
179 | ARM64_FTR_END, |
180 | }; | |
181 | ||
d71be2b6 WD |
182 | static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = { |
183 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR1_SSBS_SHIFT, 4, ID_AA64PFR1_SSBS_PSTATE_NI), | |
184 | ARM64_FTR_END, | |
185 | }; | |
186 | ||
06a916fe | 187 | static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = { |
d4209d8b SP |
188 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
189 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_F64MM_SHIFT, 4, 0), | |
190 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
191 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_F32MM_SHIFT, 4, 0), | |
192 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
193 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_I8MM_SHIFT, 4, 0), | |
ec52c713 JG |
194 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
195 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SM4_SHIFT, 4, 0), | |
196 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
197 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SHA3_SHIFT, 4, 0), | |
d4209d8b SP |
198 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
199 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_BF16_SHIFT, 4, 0), | |
ec52c713 JG |
200 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), |
201 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_BITPERM_SHIFT, 4, 0), | |
202 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
203 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_AES_SHIFT, 4, 0), | |
204 | ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_SVE), | |
205 | FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ZFR0_SVEVER_SHIFT, 4, 0), | |
06a916fe DM |
206 | ARM64_FTR_END, |
207 | }; | |
208 | ||
5e49d73c | 209 | static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { |
5717fe5a WD |
210 | /* |
211 | * We already refuse to boot CPUs that don't support our configured | |
212 | * page size, so we can only detect mismatches for a page size other | |
213 | * than the one we're currently using. Unfortunately, SoCs like this | |
214 | * exist in the wild so, even though we don't like it, we'll have to go | |
215 | * along with it and treat them as non-strict. | |
216 | */ | |
217 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN4_SHIFT, 4, ID_AA64MMFR0_TGRAN4_NI), | |
218 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN64_SHIFT, 4, ID_AA64MMFR0_TGRAN64_NI), | |
219 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_TGRAN16_SHIFT, 4, ID_AA64MMFR0_TGRAN16_NI), | |
220 | ||
5bdecb79 | 221 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL0_SHIFT, 4, 0), |
3c739b57 | 222 | /* Linux shouldn't care about secure memory */ |
5bdecb79 SP |
223 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_SNSMEM_SHIFT, 4, 0), |
224 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_BIGENDEL_SHIFT, 4, 0), | |
225 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_ASID_SHIFT, 4, 0), | |
3c739b57 SP |
226 | /* |
227 | * Differing PARange is fine as long as all peripherals and memory are mapped | |
228 | * within the minimum PARange of all CPUs | |
229 | */ | |
fe4fbdbc | 230 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_PARANGE_SHIFT, 4, 0), |
3c739b57 SP |
231 | ARM64_FTR_END, |
232 | }; | |
233 | ||
5e49d73c | 234 | static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { |
fe4fbdbc | 235 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_PAN_SHIFT, 4, 0), |
5bdecb79 SP |
236 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_LOR_SHIFT, 4, 0), |
237 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HPD_SHIFT, 4, 0), | |
238 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VHE_SHIFT, 4, 0), | |
239 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_VMIDBITS_SHIFT, 4, 0), | |
240 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_HADBS_SHIFT, 4, 0), | |
3c739b57 SP |
241 | ARM64_FTR_END, |
242 | }; | |
243 | ||
5e49d73c | 244 | static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = { |
3e6c69a0 | 245 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_E0PD_SHIFT, 4, 0), |
e48d53a9 | 246 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_FWB_SHIFT, 4, 0), |
7206dc93 | 247 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_AT_SHIFT, 4, 0), |
5bdecb79 | 248 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LVA_SHIFT, 4, 0), |
9d3f8881 | 249 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_IESB_SHIFT, 4, 0), |
5bdecb79 SP |
250 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LSM_SHIFT, 4, 0), |
251 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_UAO_SHIFT, 4, 0), | |
252 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_CNP_SHIFT, 4, 0), | |
406e3087 JM |
253 | ARM64_FTR_END, |
254 | }; | |
255 | ||
5e49d73c | 256 | static const struct arm64_ftr_bits ftr_ctr[] = { |
6ae4b6e0 SD |
257 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 31, 1, 1), /* RES1 */ |
258 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_DIC_SHIFT, 1, 1), | |
259 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_IDC_SHIFT, 1, 1), | |
147b9635 WD |
260 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_CWG_SHIFT, 4, 0), |
261 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_OR_ZERO_SAFE, CTR_ERG_SHIFT, 4, 0), | |
6ae4b6e0 | 262 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_DMINLINE_SHIFT, 4, 1), |
3c739b57 SP |
263 | /* |
264 | * Linux can handle differing I-cache policies. Userspace JITs will | |
ee7bc638 | 265 | * make use of *minLine. |
155433cb | 266 | * If we have differing I-cache policies, report it as the weakest - VIPT. |
3c739b57 | 267 | */ |
155433cb | 268 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_EXACT, 14, 2, ICACHE_POLICY_VIPT), /* L1Ip */ |
4c4a39dd | 269 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, CTR_IMINLINE_SHIFT, 4, 0), |
3c739b57 SP |
270 | ARM64_FTR_END, |
271 | }; | |
272 | ||
675b0563 AB |
273 | struct arm64_ftr_reg arm64_ftr_reg_ctrel0 = { |
274 | .name = "SYS_CTR_EL0", | |
275 | .ftr_bits = ftr_ctr | |
276 | }; | |
277 | ||
5e49d73c | 278 | static const struct arm64_ftr_bits ftr_id_mmfr0[] = { |
5bdecb79 SP |
279 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0xf), /* InnerShr */ |
280 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), /* FCSE */ | |
fe4fbdbc | 281 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, 20, 4, 0), /* AuxReg */ |
5bdecb79 SP |
282 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), /* TCM */ |
283 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), /* ShareLvl */ | |
284 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0xf), /* OuterShr */ | |
285 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* PMSA */ | |
286 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* VMSA */ | |
3c739b57 SP |
287 | ARM64_FTR_END, |
288 | }; | |
289 | ||
5e49d73c | 290 | static const struct arm64_ftr_bits ftr_id_aa64dfr0[] = { |
fe4fbdbc SP |
291 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 36, 28, 0), |
292 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_PMSVER_SHIFT, 4, 0), | |
293 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_CTX_CMPS_SHIFT, 4, 0), | |
294 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_WRPS_SHIFT, 4, 0), | |
295 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_BRPS_SHIFT, 4, 0), | |
b20d1ba3 WD |
296 | /* |
297 | * We can instantiate multiple PMU instances with different levels | |
298 | * of support. | |
fe4fbdbc SP |
299 | */ |
300 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64DFR0_PMUVER_SHIFT, 4, 0), | |
301 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_TRACEVER_SHIFT, 4, 0), | |
302 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, ID_AA64DFR0_DEBUGVER_SHIFT, 4, 0x6), | |
3c739b57 SP |
303 | ARM64_FTR_END, |
304 | }; | |
305 | ||
5e49d73c | 306 | static const struct arm64_ftr_bits ftr_mvfr2[] = { |
5bdecb79 SP |
307 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* FPMisc */ |
308 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* SIMDMisc */ | |
3c739b57 SP |
309 | ARM64_FTR_END, |
310 | }; | |
311 | ||
5e49d73c | 312 | static const struct arm64_ftr_bits ftr_dczid[] = { |
fe4fbdbc SP |
313 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_EXACT, 4, 1, 1), /* DZP */ |
314 | ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* BS */ | |
3c739b57 SP |
315 | ARM64_FTR_END, |
316 | }; | |
317 | ||
318 | ||
5e49d73c | 319 | static const struct arm64_ftr_bits ftr_id_isar5[] = { |
5bdecb79 SP |
320 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_RDM_SHIFT, 4, 0), |
321 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_CRC32_SHIFT, 4, 0), | |
322 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA2_SHIFT, 4, 0), | |
323 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SHA1_SHIFT, 4, 0), | |
324 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_AES_SHIFT, 4, 0), | |
325 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR5_SEVL_SHIFT, 4, 0), | |
3c739b57 SP |
326 | ARM64_FTR_END, |
327 | }; | |
328 | ||
5e49d73c | 329 | static const struct arm64_ftr_bits ftr_id_mmfr4[] = { |
5bdecb79 | 330 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* ac2 */ |
3c739b57 SP |
331 | ARM64_FTR_END, |
332 | }; | |
333 | ||
0113340e WD |
334 | static const struct arm64_ftr_bits ftr_id_isar4[] = { |
335 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SWP_FRAC_SHIFT, 4, 0), | |
336 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_PSR_M_SHIFT, 4, 0), | |
337 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SYNCH_PRIM_FRAC_SHIFT, 4, 0), | |
338 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_BARRIER_SHIFT, 4, 0), | |
339 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_SMC_SHIFT, 4, 0), | |
340 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_WRITEBACK_SHIFT, 4, 0), | |
341 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_WITHSHIFTS_SHIFT, 4, 0), | |
342 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR4_UNPRIV_SHIFT, 4, 0), | |
343 | ARM64_FTR_END, | |
344 | }; | |
345 | ||
8e3747be AK |
346 | static const struct arm64_ftr_bits ftr_id_isar6[] = { |
347 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_I8MM_SHIFT, 4, 0), | |
348 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_BF16_SHIFT, 4, 0), | |
349 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SPECRES_SHIFT, 4, 0), | |
350 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_SB_SHIFT, 4, 0), | |
351 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_FHM_SHIFT, 4, 0), | |
352 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_DP_SHIFT, 4, 0), | |
353 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR6_JSCVT_SHIFT, 4, 0), | |
354 | ARM64_FTR_END, | |
355 | }; | |
356 | ||
5e49d73c | 357 | static const struct arm64_ftr_bits ftr_id_pfr0[] = { |
5bdecb79 SP |
358 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), /* State3 */ |
359 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), /* State2 */ | |
360 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), /* State1 */ | |
361 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), /* State0 */ | |
3c739b57 SP |
362 | ARM64_FTR_END, |
363 | }; | |
364 | ||
0113340e WD |
365 | static const struct arm64_ftr_bits ftr_id_pfr1[] = { |
366 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_GIC_SHIFT, 4, 0), | |
367 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_VIRT_FRAC_SHIFT, 4, 0), | |
368 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_SEC_FRAC_SHIFT, 4, 0), | |
369 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_GENTIMER_SHIFT, 4, 0), | |
370 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_VIRTUALIZATION_SHIFT, 4, 0), | |
371 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_MPROGMOD_SHIFT, 4, 0), | |
372 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_SECURITY_SHIFT, 4, 0), | |
373 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR1_PROGMOD_SHIFT, 4, 0), | |
374 | ARM64_FTR_END, | |
375 | }; | |
376 | ||
5e49d73c | 377 | static const struct arm64_ftr_bits ftr_id_dfr0[] = { |
fe4fbdbc SP |
378 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), |
379 | S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0xf), /* PerfMon */ | |
380 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), | |
381 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), | |
382 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), | |
383 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), | |
384 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), | |
385 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), | |
e5343503 SP |
386 | ARM64_FTR_END, |
387 | }; | |
388 | ||
2e0f2478 DM |
389 | static const struct arm64_ftr_bits ftr_zcr[] = { |
390 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, | |
391 | ZCR_ELx_LEN_SHIFT, ZCR_ELx_LEN_SIZE, 0), /* LEN */ | |
392 | ARM64_FTR_END, | |
393 | }; | |
394 | ||
3c739b57 SP |
395 | /* |
396 | * Common ftr bits for a 32bit register with all hidden, strict | |
397 | * attributes, with 4bit feature fields and a default safe value of | |
398 | * 0. Covers the following 32bit registers: | |
399 | * id_isar[0-4], id_mmfr[1-3], id_pfr1, mvfr[0-1] | |
400 | */ | |
5e49d73c | 401 | static const struct arm64_ftr_bits ftr_generic_32bits[] = { |
fe4fbdbc SP |
402 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), |
403 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0), | |
404 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), | |
405 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), | |
406 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0), | |
407 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0), | |
408 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0), | |
409 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 0, 4, 0), | |
3c739b57 SP |
410 | ARM64_FTR_END, |
411 | }; | |
412 | ||
eab43e88 SP |
413 | /* Table for a single 32bit feature value */ |
414 | static const struct arm64_ftr_bits ftr_single32[] = { | |
fe4fbdbc | 415 | ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_EXACT, 0, 32, 0), |
3c739b57 SP |
416 | ARM64_FTR_END, |
417 | }; | |
418 | ||
eab43e88 | 419 | static const struct arm64_ftr_bits ftr_raz[] = { |
3c739b57 SP |
420 | ARM64_FTR_END, |
421 | }; | |
422 | ||
6f2b7eef AB |
423 | #define ARM64_FTR_REG(id, table) { \ |
424 | .sys_id = id, \ | |
425 | .reg = &(struct arm64_ftr_reg){ \ | |
3c739b57 SP |
426 | .name = #id, \ |
427 | .ftr_bits = &((table)[0]), \ | |
6f2b7eef | 428 | }} |
3c739b57 | 429 | |
6f2b7eef AB |
430 | static const struct __ftr_reg_entry { |
431 | u32 sys_id; | |
432 | struct arm64_ftr_reg *reg; | |
433 | } arm64_ftr_regs[] = { | |
3c739b57 SP |
434 | |
435 | /* Op1 = 0, CRn = 0, CRm = 1 */ | |
436 | ARM64_FTR_REG(SYS_ID_PFR0_EL1, ftr_id_pfr0), | |
0113340e | 437 | ARM64_FTR_REG(SYS_ID_PFR1_EL1, ftr_id_pfr1), |
e5343503 | 438 | ARM64_FTR_REG(SYS_ID_DFR0_EL1, ftr_id_dfr0), |
3c739b57 SP |
439 | ARM64_FTR_REG(SYS_ID_MMFR0_EL1, ftr_id_mmfr0), |
440 | ARM64_FTR_REG(SYS_ID_MMFR1_EL1, ftr_generic_32bits), | |
441 | ARM64_FTR_REG(SYS_ID_MMFR2_EL1, ftr_generic_32bits), | |
442 | ARM64_FTR_REG(SYS_ID_MMFR3_EL1, ftr_generic_32bits), | |
443 | ||
444 | /* Op1 = 0, CRn = 0, CRm = 2 */ | |
445 | ARM64_FTR_REG(SYS_ID_ISAR0_EL1, ftr_generic_32bits), | |
446 | ARM64_FTR_REG(SYS_ID_ISAR1_EL1, ftr_generic_32bits), | |
447 | ARM64_FTR_REG(SYS_ID_ISAR2_EL1, ftr_generic_32bits), | |
448 | ARM64_FTR_REG(SYS_ID_ISAR3_EL1, ftr_generic_32bits), | |
0113340e | 449 | ARM64_FTR_REG(SYS_ID_ISAR4_EL1, ftr_id_isar4), |
3c739b57 SP |
450 | ARM64_FTR_REG(SYS_ID_ISAR5_EL1, ftr_id_isar5), |
451 | ARM64_FTR_REG(SYS_ID_MMFR4_EL1, ftr_id_mmfr4), | |
8e3747be | 452 | ARM64_FTR_REG(SYS_ID_ISAR6_EL1, ftr_id_isar6), |
3c739b57 SP |
453 | |
454 | /* Op1 = 0, CRn = 0, CRm = 3 */ | |
455 | ARM64_FTR_REG(SYS_MVFR0_EL1, ftr_generic_32bits), | |
456 | ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_generic_32bits), | |
457 | ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), | |
458 | ||
459 | /* Op1 = 0, CRn = 0, CRm = 4 */ | |
460 | ARM64_FTR_REG(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0), | |
d71be2b6 | 461 | ARM64_FTR_REG(SYS_ID_AA64PFR1_EL1, ftr_id_aa64pfr1), |
06a916fe | 462 | ARM64_FTR_REG(SYS_ID_AA64ZFR0_EL1, ftr_id_aa64zfr0), |
3c739b57 SP |
463 | |
464 | /* Op1 = 0, CRn = 0, CRm = 5 */ | |
465 | ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1, ftr_id_aa64dfr0), | |
eab43e88 | 466 | ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_raz), |
3c739b57 SP |
467 | |
468 | /* Op1 = 0, CRn = 0, CRm = 6 */ | |
469 | ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), | |
c8c3798d | 470 | ARM64_FTR_REG(SYS_ID_AA64ISAR1_EL1, ftr_id_aa64isar1), |
3c739b57 SP |
471 | |
472 | /* Op1 = 0, CRn = 0, CRm = 7 */ | |
473 | ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0), | |
474 | ARM64_FTR_REG(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1), | |
406e3087 | 475 | ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2), |
3c739b57 | 476 | |
2e0f2478 DM |
477 | /* Op1 = 0, CRn = 1, CRm = 2 */ |
478 | ARM64_FTR_REG(SYS_ZCR_EL1, ftr_zcr), | |
479 | ||
3c739b57 | 480 | /* Op1 = 3, CRn = 0, CRm = 0 */ |
675b0563 | 481 | { SYS_CTR_EL0, &arm64_ftr_reg_ctrel0 }, |
3c739b57 SP |
482 | ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), |
483 | ||
484 | /* Op1 = 3, CRn = 14, CRm = 0 */ | |
eab43e88 | 485 | ARM64_FTR_REG(SYS_CNTFRQ_EL0, ftr_single32), |
3c739b57 SP |
486 | }; |
487 | ||
488 | static int search_cmp_ftr_reg(const void *id, const void *regp) | |
489 | { | |
6f2b7eef | 490 | return (int)(unsigned long)id - (int)((const struct __ftr_reg_entry *)regp)->sys_id; |
3c739b57 SP |
491 | } |
492 | ||
493 | /* | |
494 | * get_arm64_ftr_reg - Lookup a feature register entry using its | |
495 | * sys_reg() encoding. With the array arm64_ftr_regs sorted in the | |
496 | * ascending order of sys_id , we use binary search to find a matching | |
497 | * entry. | |
498 | * | |
499 | * returns - Upon success, matching ftr_reg entry for id. | |
500 | * - NULL on failure. It is upto the caller to decide | |
501 | * the impact of a failure. | |
502 | */ | |
503 | static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id) | |
504 | { | |
6f2b7eef AB |
505 | const struct __ftr_reg_entry *ret; |
506 | ||
507 | ret = bsearch((const void *)(unsigned long)sys_id, | |
3c739b57 SP |
508 | arm64_ftr_regs, |
509 | ARRAY_SIZE(arm64_ftr_regs), | |
510 | sizeof(arm64_ftr_regs[0]), | |
511 | search_cmp_ftr_reg); | |
6f2b7eef AB |
512 | if (ret) |
513 | return ret->reg; | |
514 | return NULL; | |
3c739b57 SP |
515 | } |
516 | ||
5e49d73c AB |
517 | static u64 arm64_ftr_set_value(const struct arm64_ftr_bits *ftrp, s64 reg, |
518 | s64 ftr_val) | |
3c739b57 SP |
519 | { |
520 | u64 mask = arm64_ftr_mask(ftrp); | |
521 | ||
522 | reg &= ~mask; | |
523 | reg |= (ftr_val << ftrp->shift) & mask; | |
524 | return reg; | |
525 | } | |
526 | ||
5e49d73c AB |
527 | static s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new, |
528 | s64 cur) | |
3c739b57 SP |
529 | { |
530 | s64 ret = 0; | |
531 | ||
532 | switch (ftrp->type) { | |
533 | case FTR_EXACT: | |
534 | ret = ftrp->safe_val; | |
535 | break; | |
536 | case FTR_LOWER_SAFE: | |
537 | ret = new < cur ? new : cur; | |
538 | break; | |
147b9635 WD |
539 | case FTR_HIGHER_OR_ZERO_SAFE: |
540 | if (!cur || !new) | |
541 | break; | |
542 | /* Fallthrough */ | |
3c739b57 SP |
543 | case FTR_HIGHER_SAFE: |
544 | ret = new > cur ? new : cur; | |
545 | break; | |
546 | default: | |
547 | BUG(); | |
548 | } | |
549 | ||
550 | return ret; | |
551 | } | |
552 | ||
3c739b57 SP |
553 | static void __init sort_ftr_regs(void) |
554 | { | |
6f2b7eef AB |
555 | int i; |
556 | ||
557 | /* Check that the array is sorted so that we can do the binary search */ | |
558 | for (i = 1; i < ARRAY_SIZE(arm64_ftr_regs); i++) | |
559 | BUG_ON(arm64_ftr_regs[i].sys_id < arm64_ftr_regs[i - 1].sys_id); | |
3c739b57 SP |
560 | } |
561 | ||
562 | /* | |
563 | * Initialise the CPU feature register from Boot CPU values. | |
564 | * Also initiliases the strict_mask for the register. | |
b389d799 MR |
565 | * Any bits that are not covered by an arm64_ftr_bits entry are considered |
566 | * RES0 for the system-wide value, and must strictly match. | |
3c739b57 SP |
567 | */ |
568 | static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new) | |
569 | { | |
570 | u64 val = 0; | |
571 | u64 strict_mask = ~0x0ULL; | |
fe4fbdbc | 572 | u64 user_mask = 0; |
b389d799 MR |
573 | u64 valid_mask = 0; |
574 | ||
5e49d73c | 575 | const struct arm64_ftr_bits *ftrp; |
3c739b57 SP |
576 | struct arm64_ftr_reg *reg = get_arm64_ftr_reg(sys_reg); |
577 | ||
578 | BUG_ON(!reg); | |
579 | ||
24b2cce9 | 580 | for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { |
b389d799 | 581 | u64 ftr_mask = arm64_ftr_mask(ftrp); |
3c739b57 SP |
582 | s64 ftr_new = arm64_ftr_value(ftrp, new); |
583 | ||
584 | val = arm64_ftr_set_value(ftrp, val, ftr_new); | |
b389d799 MR |
585 | |
586 | valid_mask |= ftr_mask; | |
3c739b57 | 587 | if (!ftrp->strict) |
b389d799 | 588 | strict_mask &= ~ftr_mask; |
fe4fbdbc SP |
589 | if (ftrp->visible) |
590 | user_mask |= ftr_mask; | |
591 | else | |
592 | reg->user_val = arm64_ftr_set_value(ftrp, | |
593 | reg->user_val, | |
594 | ftrp->safe_val); | |
3c739b57 | 595 | } |
b389d799 MR |
596 | |
597 | val &= valid_mask; | |
598 | ||
3c739b57 SP |
599 | reg->sys_val = val; |
600 | reg->strict_mask = strict_mask; | |
fe4fbdbc | 601 | reg->user_mask = user_mask; |
3c739b57 SP |
602 | } |
603 | ||
1e89baed | 604 | extern const struct arm64_cpu_capabilities arm64_errata[]; |
82a3a21b SP |
605 | static const struct arm64_cpu_capabilities arm64_features[]; |
606 | ||
607 | static void __init | |
608 | init_cpu_hwcaps_indirect_list_from_array(const struct arm64_cpu_capabilities *caps) | |
609 | { | |
610 | for (; caps->matches; caps++) { | |
611 | if (WARN(caps->capability >= ARM64_NCAPS, | |
612 | "Invalid capability %d\n", caps->capability)) | |
613 | continue; | |
614 | if (WARN(cpu_hwcaps_ptrs[caps->capability], | |
615 | "Duplicate entry for capability %d\n", | |
616 | caps->capability)) | |
617 | continue; | |
618 | cpu_hwcaps_ptrs[caps->capability] = caps; | |
619 | } | |
620 | } | |
621 | ||
622 | static void __init init_cpu_hwcaps_indirect_list(void) | |
623 | { | |
624 | init_cpu_hwcaps_indirect_list_from_array(arm64_features); | |
625 | init_cpu_hwcaps_indirect_list_from_array(arm64_errata); | |
626 | } | |
627 | ||
fd9d63da | 628 | static void __init setup_boot_cpu_capabilities(void); |
1e89baed | 629 | |
3c739b57 SP |
630 | void __init init_cpu_features(struct cpuinfo_arm64 *info) |
631 | { | |
632 | /* Before we start using the tables, make sure it is sorted */ | |
633 | sort_ftr_regs(); | |
634 | ||
635 | init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); | |
636 | init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); | |
637 | init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); | |
638 | init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); | |
639 | init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); | |
640 | init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); | |
641 | init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1, info->reg_id_aa64isar1); | |
642 | init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1, info->reg_id_aa64mmfr0); | |
643 | init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1, info->reg_id_aa64mmfr1); | |
406e3087 | 644 | init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1, info->reg_id_aa64mmfr2); |
3c739b57 SP |
645 | init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1, info->reg_id_aa64pfr0); |
646 | init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1, info->reg_id_aa64pfr1); | |
2e0f2478 | 647 | init_cpu_ftr_reg(SYS_ID_AA64ZFR0_EL1, info->reg_id_aa64zfr0); |
a6dc3cd7 SP |
648 | |
649 | if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { | |
650 | init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); | |
651 | init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); | |
652 | init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); | |
653 | init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); | |
654 | init_cpu_ftr_reg(SYS_ID_ISAR3_EL1, info->reg_id_isar3); | |
655 | init_cpu_ftr_reg(SYS_ID_ISAR4_EL1, info->reg_id_isar4); | |
656 | init_cpu_ftr_reg(SYS_ID_ISAR5_EL1, info->reg_id_isar5); | |
8e3747be | 657 | init_cpu_ftr_reg(SYS_ID_ISAR6_EL1, info->reg_id_isar6); |
a6dc3cd7 SP |
658 | init_cpu_ftr_reg(SYS_ID_MMFR0_EL1, info->reg_id_mmfr0); |
659 | init_cpu_ftr_reg(SYS_ID_MMFR1_EL1, info->reg_id_mmfr1); | |
660 | init_cpu_ftr_reg(SYS_ID_MMFR2_EL1, info->reg_id_mmfr2); | |
661 | init_cpu_ftr_reg(SYS_ID_MMFR3_EL1, info->reg_id_mmfr3); | |
662 | init_cpu_ftr_reg(SYS_ID_PFR0_EL1, info->reg_id_pfr0); | |
663 | init_cpu_ftr_reg(SYS_ID_PFR1_EL1, info->reg_id_pfr1); | |
664 | init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0); | |
665 | init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1); | |
666 | init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2); | |
667 | } | |
668 | ||
2e0f2478 DM |
669 | if (id_aa64pfr0_sve(info->reg_id_aa64pfr0)) { |
670 | init_cpu_ftr_reg(SYS_ZCR_EL1, info->reg_zcr); | |
671 | sve_init_vq_map(); | |
672 | } | |
5e91107b | 673 | |
82a3a21b SP |
674 | /* |
675 | * Initialize the indirect array of CPU hwcaps capabilities pointers | |
676 | * before we handle the boot CPU below. | |
677 | */ | |
678 | init_cpu_hwcaps_indirect_list(); | |
679 | ||
5e91107b | 680 | /* |
fd9d63da SP |
681 | * Detect and enable early CPU capabilities based on the boot CPU, |
682 | * after we have initialised the CPU feature infrastructure. | |
5e91107b | 683 | */ |
fd9d63da | 684 | setup_boot_cpu_capabilities(); |
3c739b57 SP |
685 | } |
686 | ||
3086d391 | 687 | static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new) |
3c739b57 | 688 | { |
5e49d73c | 689 | const struct arm64_ftr_bits *ftrp; |
3c739b57 SP |
690 | |
691 | for (ftrp = reg->ftr_bits; ftrp->width; ftrp++) { | |
692 | s64 ftr_cur = arm64_ftr_value(ftrp, reg->sys_val); | |
693 | s64 ftr_new = arm64_ftr_value(ftrp, new); | |
694 | ||
695 | if (ftr_cur == ftr_new) | |
696 | continue; | |
697 | /* Find a safe value */ | |
698 | ftr_new = arm64_ftr_safe_value(ftrp, ftr_new, ftr_cur); | |
699 | reg->sys_val = arm64_ftr_set_value(ftrp, reg->sys_val, ftr_new); | |
700 | } | |
701 | ||
702 | } | |
703 | ||
3086d391 | 704 | static int check_update_ftr_reg(u32 sys_id, int cpu, u64 val, u64 boot) |
cdcf817b | 705 | { |
3086d391 SP |
706 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); |
707 | ||
708 | BUG_ON(!regp); | |
709 | update_cpu_ftr_reg(regp, val); | |
710 | if ((boot & regp->strict_mask) == (val & regp->strict_mask)) | |
711 | return 0; | |
712 | pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n", | |
713 | regp->name, boot, cpu, val); | |
714 | return 1; | |
715 | } | |
716 | ||
eab2f926 WD |
717 | static void relax_cpu_ftr_reg(u32 sys_id, int field) |
718 | { | |
719 | const struct arm64_ftr_bits *ftrp; | |
720 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(sys_id); | |
721 | ||
722 | if (WARN_ON(!regp)) | |
723 | return; | |
724 | ||
725 | for (ftrp = regp->ftr_bits; ftrp->width; ftrp++) { | |
726 | if (ftrp->shift == field) { | |
727 | regp->strict_mask &= ~arm64_ftr_mask(ftrp); | |
728 | break; | |
729 | } | |
730 | } | |
731 | ||
732 | /* Bogus field? */ | |
733 | WARN_ON(!ftrp->width); | |
734 | } | |
735 | ||
1efcfe79 WD |
736 | static int update_32bit_cpu_features(int cpu, struct cpuinfo_arm64 *info, |
737 | struct cpuinfo_arm64 *boot) | |
738 | { | |
739 | int taint = 0; | |
740 | u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); | |
741 | ||
742 | /* | |
743 | * If we don't have AArch32 at all then skip the checks entirely | |
744 | * as the register values may be UNKNOWN and we're not going to be | |
745 | * using them for anything. | |
746 | */ | |
747 | if (!id_aa64pfr0_32bit_el0(pfr0)) | |
748 | return taint; | |
749 | ||
eab2f926 WD |
750 | /* |
751 | * If we don't have AArch32 at EL1, then relax the strictness of | |
752 | * EL1-dependent register fields to avoid spurious sanity check fails. | |
753 | */ | |
754 | if (!id_aa64pfr0_32bit_el1(pfr0)) { | |
755 | relax_cpu_ftr_reg(SYS_ID_ISAR4_EL1, ID_ISAR4_SMC_SHIFT); | |
756 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_VIRT_FRAC_SHIFT); | |
757 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_SEC_FRAC_SHIFT); | |
758 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_VIRTUALIZATION_SHIFT); | |
759 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_SECURITY_SHIFT); | |
760 | relax_cpu_ftr_reg(SYS_ID_PFR1_EL1, ID_PFR1_PROGMOD_SHIFT); | |
761 | } | |
762 | ||
1efcfe79 WD |
763 | taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, |
764 | info->reg_id_dfr0, boot->reg_id_dfr0); | |
765 | taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, | |
766 | info->reg_id_isar0, boot->reg_id_isar0); | |
767 | taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, | |
768 | info->reg_id_isar1, boot->reg_id_isar1); | |
769 | taint |= check_update_ftr_reg(SYS_ID_ISAR2_EL1, cpu, | |
770 | info->reg_id_isar2, boot->reg_id_isar2); | |
771 | taint |= check_update_ftr_reg(SYS_ID_ISAR3_EL1, cpu, | |
772 | info->reg_id_isar3, boot->reg_id_isar3); | |
773 | taint |= check_update_ftr_reg(SYS_ID_ISAR4_EL1, cpu, | |
774 | info->reg_id_isar4, boot->reg_id_isar4); | |
775 | taint |= check_update_ftr_reg(SYS_ID_ISAR5_EL1, cpu, | |
776 | info->reg_id_isar5, boot->reg_id_isar5); | |
777 | taint |= check_update_ftr_reg(SYS_ID_ISAR6_EL1, cpu, | |
778 | info->reg_id_isar6, boot->reg_id_isar6); | |
779 | ||
780 | /* | |
781 | * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and | |
782 | * ACTLR formats could differ across CPUs and therefore would have to | |
783 | * be trapped for virtualization anyway. | |
784 | */ | |
785 | taint |= check_update_ftr_reg(SYS_ID_MMFR0_EL1, cpu, | |
786 | info->reg_id_mmfr0, boot->reg_id_mmfr0); | |
787 | taint |= check_update_ftr_reg(SYS_ID_MMFR1_EL1, cpu, | |
788 | info->reg_id_mmfr1, boot->reg_id_mmfr1); | |
789 | taint |= check_update_ftr_reg(SYS_ID_MMFR2_EL1, cpu, | |
790 | info->reg_id_mmfr2, boot->reg_id_mmfr2); | |
791 | taint |= check_update_ftr_reg(SYS_ID_MMFR3_EL1, cpu, | |
792 | info->reg_id_mmfr3, boot->reg_id_mmfr3); | |
793 | taint |= check_update_ftr_reg(SYS_ID_PFR0_EL1, cpu, | |
794 | info->reg_id_pfr0, boot->reg_id_pfr0); | |
795 | taint |= check_update_ftr_reg(SYS_ID_PFR1_EL1, cpu, | |
796 | info->reg_id_pfr1, boot->reg_id_pfr1); | |
797 | taint |= check_update_ftr_reg(SYS_MVFR0_EL1, cpu, | |
798 | info->reg_mvfr0, boot->reg_mvfr0); | |
799 | taint |= check_update_ftr_reg(SYS_MVFR1_EL1, cpu, | |
800 | info->reg_mvfr1, boot->reg_mvfr1); | |
801 | taint |= check_update_ftr_reg(SYS_MVFR2_EL1, cpu, | |
802 | info->reg_mvfr2, boot->reg_mvfr2); | |
803 | ||
804 | return taint; | |
805 | } | |
806 | ||
3086d391 SP |
807 | /* |
808 | * Update system wide CPU feature registers with the values from a | |
809 | * non-boot CPU. Also performs SANITY checks to make sure that there | |
810 | * aren't any insane variations from that of the boot CPU. | |
811 | */ | |
812 | void update_cpu_features(int cpu, | |
813 | struct cpuinfo_arm64 *info, | |
814 | struct cpuinfo_arm64 *boot) | |
815 | { | |
816 | int taint = 0; | |
817 | ||
818 | /* | |
819 | * The kernel can handle differing I-cache policies, but otherwise | |
820 | * caches should look identical. Userspace JITs will make use of | |
821 | * *minLine. | |
822 | */ | |
823 | taint |= check_update_ftr_reg(SYS_CTR_EL0, cpu, | |
824 | info->reg_ctr, boot->reg_ctr); | |
825 | ||
826 | /* | |
827 | * Userspace may perform DC ZVA instructions. Mismatched block sizes | |
828 | * could result in too much or too little memory being zeroed if a | |
829 | * process is preempted and migrated between CPUs. | |
830 | */ | |
831 | taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, | |
832 | info->reg_dczid, boot->reg_dczid); | |
833 | ||
834 | /* If different, timekeeping will be broken (especially with KVM) */ | |
835 | taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, | |
836 | info->reg_cntfrq, boot->reg_cntfrq); | |
837 | ||
838 | /* | |
839 | * The kernel uses self-hosted debug features and expects CPUs to | |
840 | * support identical debug features. We presently need CTX_CMPs, WRPs, | |
841 | * and BRPs to be identical. | |
842 | * ID_AA64DFR1 is currently RES0. | |
843 | */ | |
844 | taint |= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1, cpu, | |
845 | info->reg_id_aa64dfr0, boot->reg_id_aa64dfr0); | |
846 | taint |= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1, cpu, | |
847 | info->reg_id_aa64dfr1, boot->reg_id_aa64dfr1); | |
848 | /* | |
849 | * Even in big.LITTLE, processors should be identical instruction-set | |
850 | * wise. | |
851 | */ | |
852 | taint |= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1, cpu, | |
853 | info->reg_id_aa64isar0, boot->reg_id_aa64isar0); | |
854 | taint |= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1, cpu, | |
855 | info->reg_id_aa64isar1, boot->reg_id_aa64isar1); | |
856 | ||
857 | /* | |
858 | * Differing PARange support is fine as long as all peripherals and | |
859 | * memory are mapped within the minimum PARange of all CPUs. | |
860 | * Linux should not care about secure memory. | |
861 | */ | |
862 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1, cpu, | |
863 | info->reg_id_aa64mmfr0, boot->reg_id_aa64mmfr0); | |
864 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1, cpu, | |
865 | info->reg_id_aa64mmfr1, boot->reg_id_aa64mmfr1); | |
406e3087 JM |
866 | taint |= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1, cpu, |
867 | info->reg_id_aa64mmfr2, boot->reg_id_aa64mmfr2); | |
3086d391 | 868 | |
3086d391 SP |
869 | taint |= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1, cpu, |
870 | info->reg_id_aa64pfr0, boot->reg_id_aa64pfr0); | |
871 | taint |= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1, cpu, | |
872 | info->reg_id_aa64pfr1, boot->reg_id_aa64pfr1); | |
873 | ||
2e0f2478 DM |
874 | taint |= check_update_ftr_reg(SYS_ID_AA64ZFR0_EL1, cpu, |
875 | info->reg_id_aa64zfr0, boot->reg_id_aa64zfr0); | |
876 | ||
2e0f2478 DM |
877 | if (id_aa64pfr0_sve(info->reg_id_aa64pfr0)) { |
878 | taint |= check_update_ftr_reg(SYS_ZCR_EL1, cpu, | |
879 | info->reg_zcr, boot->reg_zcr); | |
880 | ||
881 | /* Probe vector lengths, unless we already gave up on SVE */ | |
882 | if (id_aa64pfr0_sve(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1)) && | |
b51c6ac2 | 883 | !system_capabilities_finalized()) |
2e0f2478 DM |
884 | sve_update_vq_map(); |
885 | } | |
886 | ||
1efcfe79 WD |
887 | /* |
888 | * This relies on a sanitised view of the AArch64 ID registers | |
889 | * (e.g. SYS_ID_AA64PFR0_EL1), so we call it last. | |
890 | */ | |
891 | taint |= update_32bit_cpu_features(cpu, info, boot); | |
892 | ||
3086d391 SP |
893 | /* |
894 | * Mismatched CPU features are a recipe for disaster. Don't even | |
895 | * pretend to support them. | |
896 | */ | |
8dd0ee65 WD |
897 | if (taint) { |
898 | pr_warn_once("Unsupported CPU feature variation detected.\n"); | |
899 | add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK); | |
900 | } | |
cdcf817b SP |
901 | } |
902 | ||
46823dd1 | 903 | u64 read_sanitised_ftr_reg(u32 id) |
b3f15378 SP |
904 | { |
905 | struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id); | |
906 | ||
907 | /* We shouldn't get a request for an unsupported register */ | |
908 | BUG_ON(!regp); | |
909 | return regp->sys_val; | |
910 | } | |
359b7064 | 911 | |
965861d6 MR |
912 | #define read_sysreg_case(r) \ |
913 | case r: return read_sysreg_s(r) | |
914 | ||
92406f0c | 915 | /* |
46823dd1 | 916 | * __read_sysreg_by_encoding() - Used by a STARTING cpu before cpuinfo is populated. |
92406f0c SP |
917 | * Read the system register on the current CPU |
918 | */ | |
46823dd1 | 919 | static u64 __read_sysreg_by_encoding(u32 sys_id) |
92406f0c SP |
920 | { |
921 | switch (sys_id) { | |
965861d6 MR |
922 | read_sysreg_case(SYS_ID_PFR0_EL1); |
923 | read_sysreg_case(SYS_ID_PFR1_EL1); | |
924 | read_sysreg_case(SYS_ID_DFR0_EL1); | |
925 | read_sysreg_case(SYS_ID_MMFR0_EL1); | |
926 | read_sysreg_case(SYS_ID_MMFR1_EL1); | |
927 | read_sysreg_case(SYS_ID_MMFR2_EL1); | |
928 | read_sysreg_case(SYS_ID_MMFR3_EL1); | |
929 | read_sysreg_case(SYS_ID_ISAR0_EL1); | |
930 | read_sysreg_case(SYS_ID_ISAR1_EL1); | |
931 | read_sysreg_case(SYS_ID_ISAR2_EL1); | |
932 | read_sysreg_case(SYS_ID_ISAR3_EL1); | |
933 | read_sysreg_case(SYS_ID_ISAR4_EL1); | |
934 | read_sysreg_case(SYS_ID_ISAR5_EL1); | |
8e3747be | 935 | read_sysreg_case(SYS_ID_ISAR6_EL1); |
965861d6 MR |
936 | read_sysreg_case(SYS_MVFR0_EL1); |
937 | read_sysreg_case(SYS_MVFR1_EL1); | |
938 | read_sysreg_case(SYS_MVFR2_EL1); | |
939 | ||
940 | read_sysreg_case(SYS_ID_AA64PFR0_EL1); | |
941 | read_sysreg_case(SYS_ID_AA64PFR1_EL1); | |
78ed70bf | 942 | read_sysreg_case(SYS_ID_AA64ZFR0_EL1); |
965861d6 MR |
943 | read_sysreg_case(SYS_ID_AA64DFR0_EL1); |
944 | read_sysreg_case(SYS_ID_AA64DFR1_EL1); | |
945 | read_sysreg_case(SYS_ID_AA64MMFR0_EL1); | |
946 | read_sysreg_case(SYS_ID_AA64MMFR1_EL1); | |
947 | read_sysreg_case(SYS_ID_AA64MMFR2_EL1); | |
948 | read_sysreg_case(SYS_ID_AA64ISAR0_EL1); | |
949 | read_sysreg_case(SYS_ID_AA64ISAR1_EL1); | |
950 | ||
951 | read_sysreg_case(SYS_CNTFRQ_EL0); | |
952 | read_sysreg_case(SYS_CTR_EL0); | |
953 | read_sysreg_case(SYS_DCZID_EL0); | |
954 | ||
92406f0c SP |
955 | default: |
956 | BUG(); | |
957 | return 0; | |
958 | } | |
959 | } | |
960 | ||
963fcd40 MZ |
961 | #include <linux/irqchip/arm-gic-v3.h> |
962 | ||
18ffa046 JM |
963 | static bool |
964 | feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) | |
965 | { | |
28c5dcb2 | 966 | int val = cpuid_feature_extract_field(reg, entry->field_pos, entry->sign); |
18ffa046 JM |
967 | |
968 | return val >= entry->min_field_value; | |
969 | } | |
970 | ||
da8d02d1 | 971 | static bool |
92406f0c | 972 | has_cpuid_feature(const struct arm64_cpu_capabilities *entry, int scope) |
da8d02d1 SP |
973 | { |
974 | u64 val; | |
94a9e04a | 975 | |
92406f0c SP |
976 | WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); |
977 | if (scope == SCOPE_SYSTEM) | |
46823dd1 | 978 | val = read_sanitised_ftr_reg(entry->sys_reg); |
92406f0c | 979 | else |
46823dd1 | 980 | val = __read_sysreg_by_encoding(entry->sys_reg); |
92406f0c | 981 | |
da8d02d1 SP |
982 | return feature_matches(val, entry); |
983 | } | |
338d4f49 | 984 | |
92406f0c | 985 | static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry, int scope) |
963fcd40 MZ |
986 | { |
987 | bool has_sre; | |
988 | ||
92406f0c | 989 | if (!has_cpuid_feature(entry, scope)) |
963fcd40 MZ |
990 | return false; |
991 | ||
992 | has_sre = gic_enable_sre(); | |
993 | if (!has_sre) | |
994 | pr_warn_once("%s present but disabled by higher exception level\n", | |
995 | entry->desc); | |
996 | ||
997 | return has_sre; | |
998 | } | |
999 | ||
92406f0c | 1000 | static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities *entry, int __unused) |
d5370f75 WD |
1001 | { |
1002 | u32 midr = read_cpuid_id(); | |
d5370f75 WD |
1003 | |
1004 | /* Cavium ThunderX pass 1.x and 2.x */ | |
b99286b0 | 1005 | return midr_is_cpu_model_range(midr, MIDR_THUNDERX, |
fa5ce3d1 RR |
1006 | MIDR_CPU_VAR_REV(0, 0), |
1007 | MIDR_CPU_VAR_REV(1, MIDR_REVISION_MASK)); | |
d5370f75 WD |
1008 | } |
1009 | ||
82e0191a SP |
1010 | static bool has_no_fpsimd(const struct arm64_cpu_capabilities *entry, int __unused) |
1011 | { | |
46823dd1 | 1012 | u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); |
82e0191a SP |
1013 | |
1014 | return cpuid_feature_extract_signed_field(pfr0, | |
1015 | ID_AA64PFR0_FP_SHIFT) < 0; | |
1016 | } | |
1017 | ||
6ae4b6e0 | 1018 | static bool has_cache_idc(const struct arm64_cpu_capabilities *entry, |
8ab66cbe | 1019 | int scope) |
6ae4b6e0 | 1020 | { |
8ab66cbe SP |
1021 | u64 ctr; |
1022 | ||
1023 | if (scope == SCOPE_SYSTEM) | |
1024 | ctr = arm64_ftr_reg_ctrel0.sys_val; | |
1025 | else | |
1602df02 | 1026 | ctr = read_cpuid_effective_cachetype(); |
8ab66cbe SP |
1027 | |
1028 | return ctr & BIT(CTR_IDC_SHIFT); | |
6ae4b6e0 SD |
1029 | } |
1030 | ||
1602df02 SP |
1031 | static void cpu_emulate_effective_ctr(const struct arm64_cpu_capabilities *__unused) |
1032 | { | |
1033 | /* | |
1034 | * If the CPU exposes raw CTR_EL0.IDC = 0, while effectively | |
1035 | * CTR_EL0.IDC = 1 (from CLIDR values), we need to trap accesses | |
1036 | * to the CTR_EL0 on this CPU and emulate it with the real/safe | |
1037 | * value. | |
1038 | */ | |
1039 | if (!(read_cpuid_cachetype() & BIT(CTR_IDC_SHIFT))) | |
1040 | sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0); | |
1041 | } | |
1042 | ||
6ae4b6e0 | 1043 | static bool has_cache_dic(const struct arm64_cpu_capabilities *entry, |
8ab66cbe | 1044 | int scope) |
6ae4b6e0 | 1045 | { |
8ab66cbe SP |
1046 | u64 ctr; |
1047 | ||
1048 | if (scope == SCOPE_SYSTEM) | |
1049 | ctr = arm64_ftr_reg_ctrel0.sys_val; | |
1050 | else | |
1051 | ctr = read_cpuid_cachetype(); | |
1052 | ||
1053 | return ctr & BIT(CTR_DIC_SHIFT); | |
6ae4b6e0 SD |
1054 | } |
1055 | ||
5ffdfaed VM |
1056 | static bool __maybe_unused |
1057 | has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope) | |
1058 | { | |
1059 | /* | |
1060 | * Kdump isn't guaranteed to power-off all secondary CPUs, CNP | |
1061 | * may share TLB entries with a CPU stuck in the crashed | |
1062 | * kernel. | |
1063 | */ | |
1064 | if (is_kdump_kernel()) | |
1065 | return false; | |
1066 | ||
1067 | return has_cpuid_feature(entry, scope); | |
1068 | } | |
1069 | ||
09e3c22a MB |
1070 | /* |
1071 | * This check is triggered during the early boot before the cpufeature | |
1072 | * is initialised. Checking the status on the local CPU allows the boot | |
1073 | * CPU to detect the need for non-global mappings and thus avoiding a | |
1074 | * pagetable re-write after all the CPUs are booted. This check will be | |
1075 | * anyway run on individual CPUs, allowing us to get the consistent | |
1076 | * state once the SMP CPUs are up and thus make the switch to non-global | |
1077 | * mappings if required. | |
1078 | */ | |
1079 | bool kaslr_requires_kpti(void) | |
1080 | { | |
09e3c22a MB |
1081 | if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE)) |
1082 | return false; | |
1083 | ||
1084 | /* | |
1085 | * E0PD does a similar job to KPTI so can be used instead | |
1086 | * where available. | |
1087 | */ | |
1088 | if (IS_ENABLED(CONFIG_ARM64_E0PD)) { | |
a569f5f3 WD |
1089 | u64 mmfr2 = read_sysreg_s(SYS_ID_AA64MMFR2_EL1); |
1090 | if (cpuid_feature_extract_unsigned_field(mmfr2, | |
1091 | ID_AA64MMFR2_E0PD_SHIFT)) | |
09e3c22a MB |
1092 | return false; |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Systems affected by Cavium erratum 24756 are incompatible | |
1097 | * with KPTI. | |
1098 | */ | |
ebac96ed | 1099 | if (IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) { |
09e3c22a MB |
1100 | extern const struct midr_range cavium_erratum_27456_cpus[]; |
1101 | ||
ebac96ed WD |
1102 | if (is_midr_in_range_list(read_cpuid_id(), |
1103 | cavium_erratum_27456_cpus)) | |
1104 | return false; | |
09e3c22a | 1105 | } |
09e3c22a MB |
1106 | |
1107 | return kaslr_offset() > 0; | |
1108 | } | |
1109 | ||
1b3ccf4b | 1110 | static bool __meltdown_safe = true; |
ea1e3de8 WD |
1111 | static int __kpti_forced; /* 0: not forced, >0: forced on, <0: forced off */ |
1112 | ||
1113 | static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, | |
d3aec8a2 | 1114 | int scope) |
ea1e3de8 | 1115 | { |
be5b2998 SP |
1116 | /* List of CPUs that are not vulnerable and don't need KPTI */ |
1117 | static const struct midr_range kpti_safe_list[] = { | |
1118 | MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), | |
1119 | MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), | |
31d868c4 | 1120 | MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), |
2a355ec2 WD |
1121 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), |
1122 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), | |
1123 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), | |
1124 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), | |
1125 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), | |
1126 | MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), | |
0ecc471a | 1127 | MIDR_ALL_VERSIONS(MIDR_HISI_TSV110), |
918e1946 | 1128 | MIDR_ALL_VERSIONS(MIDR_NVIDIA_CARMEL), |
71c751f2 | 1129 | { /* sentinel */ } |
be5b2998 | 1130 | }; |
a111b7c0 | 1131 | char const *str = "kpti command line option"; |
1b3ccf4b JL |
1132 | bool meltdown_safe; |
1133 | ||
1134 | meltdown_safe = is_midr_in_range_list(read_cpuid_id(), kpti_safe_list); | |
1135 | ||
1136 | /* Defer to CPU feature registers */ | |
1137 | if (has_cpuid_feature(entry, scope)) | |
1138 | meltdown_safe = true; | |
1139 | ||
1140 | if (!meltdown_safe) | |
1141 | __meltdown_safe = false; | |
179a56f6 | 1142 | |
6dc52b15 MZ |
1143 | /* |
1144 | * For reasons that aren't entirely clear, enabling KPTI on Cavium | |
1145 | * ThunderX leads to apparent I-cache corruption of kernel text, which | |
1146 | * ends as well as you might imagine. Don't even try. | |
1147 | */ | |
1148 | if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_27456)) { | |
1149 | str = "ARM64_WORKAROUND_CAVIUM_27456"; | |
1150 | __kpti_forced = -1; | |
1151 | } | |
1152 | ||
1b3ccf4b | 1153 | /* Useful for KASLR robustness */ |
c2d92353 | 1154 | if (kaslr_requires_kpti()) { |
1b3ccf4b JL |
1155 | if (!__kpti_forced) { |
1156 | str = "KASLR"; | |
1157 | __kpti_forced = 1; | |
1158 | } | |
1159 | } | |
1160 | ||
a111b7c0 JP |
1161 | if (cpu_mitigations_off() && !__kpti_forced) { |
1162 | str = "mitigations=off"; | |
1163 | __kpti_forced = -1; | |
1164 | } | |
1165 | ||
1b3ccf4b JL |
1166 | if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) { |
1167 | pr_info_once("kernel page table isolation disabled by kernel configuration\n"); | |
1168 | return false; | |
1169 | } | |
1170 | ||
6dc52b15 | 1171 | /* Forced? */ |
ea1e3de8 | 1172 | if (__kpti_forced) { |
6dc52b15 MZ |
1173 | pr_info_once("kernel page table isolation forced %s by %s\n", |
1174 | __kpti_forced > 0 ? "ON" : "OFF", str); | |
ea1e3de8 WD |
1175 | return __kpti_forced > 0; |
1176 | } | |
1177 | ||
1b3ccf4b | 1178 | return !meltdown_safe; |
ea1e3de8 WD |
1179 | } |
1180 | ||
1b3ccf4b | 1181 | #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 |
c0cda3b8 DM |
1182 | static void |
1183 | kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) | |
f992b4df WD |
1184 | { |
1185 | typedef void (kpti_remap_fn)(int, int, phys_addr_t); | |
1186 | extern kpti_remap_fn idmap_kpti_install_ng_mappings; | |
1187 | kpti_remap_fn *remap_fn; | |
1188 | ||
f992b4df WD |
1189 | int cpu = smp_processor_id(); |
1190 | ||
b89d82ef WD |
1191 | /* |
1192 | * We don't need to rewrite the page-tables if either we've done | |
1193 | * it already or we have KASLR enabled and therefore have not | |
1194 | * created any global mappings at all. | |
1195 | */ | |
09e3c22a | 1196 | if (arm64_use_ng_mappings) |
c0cda3b8 | 1197 | return; |
f992b4df WD |
1198 | |
1199 | remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings); | |
1200 | ||
1201 | cpu_install_idmap(); | |
1202 | remap_fn(cpu, num_online_cpus(), __pa_symbol(swapper_pg_dir)); | |
1203 | cpu_uninstall_idmap(); | |
1204 | ||
1205 | if (!cpu) | |
09e3c22a | 1206 | arm64_use_ng_mappings = true; |
f992b4df | 1207 | |
c0cda3b8 | 1208 | return; |
f992b4df | 1209 | } |
1b3ccf4b JL |
1210 | #else |
1211 | static void | |
1212 | kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) | |
1213 | { | |
1214 | } | |
1215 | #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ | |
f992b4df | 1216 | |
ea1e3de8 WD |
1217 | static int __init parse_kpti(char *str) |
1218 | { | |
1219 | bool enabled; | |
1220 | int ret = strtobool(str, &enabled); | |
1221 | ||
1222 | if (ret) | |
1223 | return ret; | |
1224 | ||
1225 | __kpti_forced = enabled ? 1 : -1; | |
1226 | return 0; | |
1227 | } | |
b5b7dd64 | 1228 | early_param("kpti", parse_kpti); |
ea1e3de8 | 1229 | |
05abb595 SP |
1230 | #ifdef CONFIG_ARM64_HW_AFDBM |
1231 | static inline void __cpu_enable_hw_dbm(void) | |
1232 | { | |
1233 | u64 tcr = read_sysreg(tcr_el1) | TCR_HD; | |
1234 | ||
1235 | write_sysreg(tcr, tcr_el1); | |
1236 | isb(); | |
1237 | } | |
1238 | ||
ece1397c SP |
1239 | static bool cpu_has_broken_dbm(void) |
1240 | { | |
1241 | /* List of CPUs which have broken DBM support. */ | |
1242 | static const struct midr_range cpus[] = { | |
1243 | #ifdef CONFIG_ARM64_ERRATUM_1024718 | |
1244 | MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 1, 0), // A55 r0p0 -r1p0 | |
1245 | #endif | |
1246 | {}, | |
1247 | }; | |
1248 | ||
1249 | return is_midr_in_range_list(read_cpuid_id(), cpus); | |
1250 | } | |
1251 | ||
05abb595 SP |
1252 | static bool cpu_can_use_dbm(const struct arm64_cpu_capabilities *cap) |
1253 | { | |
ece1397c SP |
1254 | return has_cpuid_feature(cap, SCOPE_LOCAL_CPU) && |
1255 | !cpu_has_broken_dbm(); | |
05abb595 SP |
1256 | } |
1257 | ||
1258 | static void cpu_enable_hw_dbm(struct arm64_cpu_capabilities const *cap) | |
1259 | { | |
1260 | if (cpu_can_use_dbm(cap)) | |
1261 | __cpu_enable_hw_dbm(); | |
1262 | } | |
1263 | ||
1264 | static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap, | |
1265 | int __unused) | |
1266 | { | |
1267 | static bool detected = false; | |
1268 | /* | |
1269 | * DBM is a non-conflicting feature. i.e, the kernel can safely | |
1270 | * run a mix of CPUs with and without the feature. So, we | |
1271 | * unconditionally enable the capability to allow any late CPU | |
1272 | * to use the feature. We only enable the control bits on the | |
1273 | * CPU, if it actually supports. | |
1274 | * | |
1275 | * We have to make sure we print the "feature" detection only | |
1276 | * when at least one CPU actually uses it. So check if this CPU | |
1277 | * can actually use it and print the message exactly once. | |
1278 | * | |
1279 | * This is safe as all CPUs (including secondary CPUs - due to the | |
1280 | * LOCAL_CPU scope - and the hotplugged CPUs - via verification) | |
1281 | * goes through the "matches" check exactly once. Also if a CPU | |
1282 | * matches the criteria, it is guaranteed that the CPU will turn | |
1283 | * the DBM on, as the capability is unconditionally enabled. | |
1284 | */ | |
1285 | if (!detected && cpu_can_use_dbm(cap)) { | |
1286 | detected = true; | |
1287 | pr_info("detected: Hardware dirty bit management\n"); | |
1288 | } | |
1289 | ||
1290 | return true; | |
1291 | } | |
1292 | ||
1293 | #endif | |
1294 | ||
2c9d45b4 IV |
1295 | #ifdef CONFIG_ARM64_AMU_EXTN |
1296 | ||
1297 | /* | |
1298 | * The "amu_cpus" cpumask only signals that the CPU implementation for the | |
1299 | * flagged CPUs supports the Activity Monitors Unit (AMU) but does not provide | |
1300 | * information regarding all the events that it supports. When a CPU bit is | |
1301 | * set in the cpumask, the user of this feature can only rely on the presence | |
1302 | * of the 4 fixed counters for that CPU. But this does not guarantee that the | |
1303 | * counters are enabled or access to these counters is enabled by code | |
1304 | * executed at higher exception levels (firmware). | |
1305 | */ | |
1306 | static struct cpumask amu_cpus __read_mostly; | |
1307 | ||
1308 | bool cpu_has_amu_feat(int cpu) | |
1309 | { | |
1310 | return cpumask_test_cpu(cpu, &amu_cpus); | |
1311 | } | |
1312 | ||
cd0ed03a IV |
1313 | /* Initialize the use of AMU counters for frequency invariance */ |
1314 | extern void init_cpu_freq_invariance_counters(void); | |
1315 | ||
2c9d45b4 IV |
1316 | static void cpu_amu_enable(struct arm64_cpu_capabilities const *cap) |
1317 | { | |
1318 | if (has_cpuid_feature(cap, SCOPE_LOCAL_CPU)) { | |
1319 | pr_info("detected CPU%d: Activity Monitors Unit (AMU)\n", | |
1320 | smp_processor_id()); | |
1321 | cpumask_set_cpu(smp_processor_id(), &amu_cpus); | |
cd0ed03a | 1322 | init_cpu_freq_invariance_counters(); |
2c9d45b4 IV |
1323 | } |
1324 | } | |
1325 | ||
1326 | static bool has_amu(const struct arm64_cpu_capabilities *cap, | |
1327 | int __unused) | |
1328 | { | |
1329 | /* | |
1330 | * The AMU extension is a non-conflicting feature: the kernel can | |
1331 | * safely run a mix of CPUs with and without support for the | |
1332 | * activity monitors extension. Therefore, unconditionally enable | |
1333 | * the capability to allow any late CPU to use the feature. | |
1334 | * | |
1335 | * With this feature unconditionally enabled, the cpu_enable | |
1336 | * function will be called for all CPUs that match the criteria, | |
1337 | * including secondary and hotplugged, marking this feature as | |
1338 | * present on that respective CPU. The enable function will also | |
1339 | * print a detection message. | |
1340 | */ | |
1341 | ||
1342 | return true; | |
1343 | } | |
1344 | #endif | |
1345 | ||
12eb3691 WD |
1346 | #ifdef CONFIG_ARM64_VHE |
1347 | static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused) | |
1348 | { | |
1349 | return is_kernel_in_hyp_mode(); | |
1350 | } | |
1351 | ||
c0cda3b8 | 1352 | static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) |
6d99b689 JM |
1353 | { |
1354 | /* | |
1355 | * Copy register values that aren't redirected by hardware. | |
1356 | * | |
1357 | * Before code patching, we only set tpidr_el1, all CPUs need to copy | |
1358 | * this value to tpidr_el2 before we patch the code. Once we've done | |
1359 | * that, freshly-onlined CPUs will set tpidr_el2, so we don't need to | |
1360 | * do anything here. | |
1361 | */ | |
e9ab7a2e | 1362 | if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) |
6d99b689 | 1363 | write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); |
6d99b689 | 1364 | } |
12eb3691 | 1365 | #endif |
6d99b689 | 1366 | |
e48d53a9 MZ |
1367 | static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused) |
1368 | { | |
1369 | u64 val = read_sysreg_s(SYS_CLIDR_EL1); | |
1370 | ||
1371 | /* Check that CLIDR_EL1.LOU{U,IS} are both 0 */ | |
1372 | WARN_ON(val & (7 << 27 | 7 << 21)); | |
1373 | } | |
1374 | ||
8f04e8e6 WD |
1375 | #ifdef CONFIG_ARM64_SSBD |
1376 | static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr) | |
1377 | { | |
1378 | if (user_mode(regs)) | |
1379 | return 1; | |
1380 | ||
74e24828 | 1381 | if (instr & BIT(PSTATE_Imm_shift)) |
8f04e8e6 WD |
1382 | regs->pstate |= PSR_SSBS_BIT; |
1383 | else | |
1384 | regs->pstate &= ~PSR_SSBS_BIT; | |
1385 | ||
1386 | arm64_skip_faulting_instruction(regs, 4); | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | static struct undef_hook ssbs_emulation_hook = { | |
74e24828 SP |
1391 | .instr_mask = ~(1U << PSTATE_Imm_shift), |
1392 | .instr_val = 0xd500401f | PSTATE_SSBS, | |
8f04e8e6 WD |
1393 | .fn = ssbs_emulation_handler, |
1394 | }; | |
1395 | ||
1396 | static void cpu_enable_ssbs(const struct arm64_cpu_capabilities *__unused) | |
1397 | { | |
1398 | static bool undef_hook_registered = false; | |
27e6e7d6 | 1399 | static DEFINE_RAW_SPINLOCK(hook_lock); |
8f04e8e6 | 1400 | |
27e6e7d6 | 1401 | raw_spin_lock(&hook_lock); |
8f04e8e6 WD |
1402 | if (!undef_hook_registered) { |
1403 | register_undef_hook(&ssbs_emulation_hook); | |
1404 | undef_hook_registered = true; | |
1405 | } | |
27e6e7d6 | 1406 | raw_spin_unlock(&hook_lock); |
8f04e8e6 WD |
1407 | |
1408 | if (arm64_get_ssbd_state() == ARM64_SSBD_FORCE_DISABLE) { | |
1409 | sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_DSSBS); | |
1410 | arm64_set_ssbd_mitigation(false); | |
1411 | } else { | |
1412 | arm64_set_ssbd_mitigation(true); | |
1413 | } | |
1414 | } | |
1415 | #endif /* CONFIG_ARM64_SSBD */ | |
1416 | ||
b8925ee2 WD |
1417 | #ifdef CONFIG_ARM64_PAN |
1418 | static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused) | |
1419 | { | |
1420 | /* | |
1421 | * We modify PSTATE. This won't work from irq context as the PSTATE | |
1422 | * is discarded once we return from the exception. | |
1423 | */ | |
1424 | WARN_ON_ONCE(in_interrupt()); | |
1425 | ||
1426 | sysreg_clear_set(sctlr_el1, SCTLR_EL1_SPAN, 0); | |
1427 | asm(SET_PSTATE_PAN(1)); | |
1428 | } | |
1429 | #endif /* CONFIG_ARM64_PAN */ | |
1430 | ||
1431 | #ifdef CONFIG_ARM64_RAS_EXTN | |
1432 | static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused) | |
1433 | { | |
1434 | /* Firmware may have left a deferred SError in this register. */ | |
1435 | write_sysreg_s(0, SYS_DISR_EL1); | |
1436 | } | |
1437 | #endif /* CONFIG_ARM64_RAS_EXTN */ | |
1438 | ||
6984eb47 | 1439 | #ifdef CONFIG_ARM64_PTR_AUTH |
cfef06bd KM |
1440 | static bool has_address_auth(const struct arm64_cpu_capabilities *entry, |
1441 | int __unused) | |
1442 | { | |
1443 | return __system_matches_cap(ARM64_HAS_ADDRESS_AUTH_ARCH) || | |
1444 | __system_matches_cap(ARM64_HAS_ADDRESS_AUTH_IMP_DEF); | |
1445 | } | |
1446 | ||
1447 | static bool has_generic_auth(const struct arm64_cpu_capabilities *entry, | |
1448 | int __unused) | |
75031975 | 1449 | { |
cfef06bd KM |
1450 | return __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH) || |
1451 | __system_matches_cap(ARM64_HAS_GENERIC_AUTH_IMP_DEF); | |
75031975 | 1452 | } |
6984eb47 MR |
1453 | #endif /* CONFIG_ARM64_PTR_AUTH */ |
1454 | ||
3e6c69a0 MB |
1455 | #ifdef CONFIG_ARM64_E0PD |
1456 | static void cpu_enable_e0pd(struct arm64_cpu_capabilities const *cap) | |
1457 | { | |
1458 | if (this_cpu_has_cap(ARM64_HAS_E0PD)) | |
1459 | sysreg_clear_set(tcr_el1, 0, TCR_E0PD1); | |
1460 | } | |
1461 | #endif /* CONFIG_ARM64_E0PD */ | |
1462 | ||
b90d2b22 | 1463 | #ifdef CONFIG_ARM64_PSEUDO_NMI |
bc3c03cc JT |
1464 | static bool enable_pseudo_nmi; |
1465 | ||
1466 | static int __init early_enable_pseudo_nmi(char *p) | |
1467 | { | |
1468 | return strtobool(p, &enable_pseudo_nmi); | |
1469 | } | |
1470 | early_param("irqchip.gicv3_pseudo_nmi", early_enable_pseudo_nmi); | |
1471 | ||
b90d2b22 JT |
1472 | static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry, |
1473 | int scope) | |
1474 | { | |
bc3c03cc | 1475 | return enable_pseudo_nmi && has_useable_gicv3_cpuif(entry, scope); |
b90d2b22 JT |
1476 | } |
1477 | #endif | |
1478 | ||
8c176e16 ADK |
1479 | /* Internal helper functions to match cpu capability type */ |
1480 | static bool | |
1481 | cpucap_late_cpu_optional(const struct arm64_cpu_capabilities *cap) | |
1482 | { | |
1483 | return !!(cap->type & ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU); | |
1484 | } | |
1485 | ||
1486 | static bool | |
1487 | cpucap_late_cpu_permitted(const struct arm64_cpu_capabilities *cap) | |
1488 | { | |
1489 | return !!(cap->type & ARM64_CPUCAP_PERMITTED_FOR_LATE_CPU); | |
1490 | } | |
1491 | ||
deeaac51 KM |
1492 | static bool |
1493 | cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap) | |
1494 | { | |
1495 | return !!(cap->type & ARM64_CPUCAP_PANIC_ON_CONFLICT); | |
1496 | } | |
1497 | ||
359b7064 | 1498 | static const struct arm64_cpu_capabilities arm64_features[] = { |
94a9e04a MZ |
1499 | { |
1500 | .desc = "GIC system register CPU interface", | |
1501 | .capability = ARM64_HAS_SYSREG_GIC_CPUIF, | |
c9bfdf73 | 1502 | .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, |
963fcd40 | 1503 | .matches = has_useable_gicv3_cpuif, |
da8d02d1 SP |
1504 | .sys_reg = SYS_ID_AA64PFR0_EL1, |
1505 | .field_pos = ID_AA64PFR0_GIC_SHIFT, | |
ff96f7bc | 1506 | .sign = FTR_UNSIGNED, |
18ffa046 | 1507 | .min_field_value = 1, |
94a9e04a | 1508 | }, |
338d4f49 JM |
1509 | #ifdef CONFIG_ARM64_PAN |
1510 | { | |
1511 | .desc = "Privileged Access Never", | |
1512 | .capability = ARM64_HAS_PAN, | |
5b4747c5 | 1513 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
da8d02d1 SP |
1514 | .matches = has_cpuid_feature, |
1515 | .sys_reg = SYS_ID_AA64MMFR1_EL1, | |
1516 | .field_pos = ID_AA64MMFR1_PAN_SHIFT, | |
ff96f7bc | 1517 | .sign = FTR_UNSIGNED, |
338d4f49 | 1518 | .min_field_value = 1, |
c0cda3b8 | 1519 | .cpu_enable = cpu_enable_pan, |
338d4f49 JM |
1520 | }, |
1521 | #endif /* CONFIG_ARM64_PAN */ | |
395af861 | 1522 | #ifdef CONFIG_ARM64_LSE_ATOMICS |
2e94da13 WD |
1523 | { |
1524 | .desc = "LSE atomic instructions", | |
1525 | .capability = ARM64_HAS_LSE_ATOMICS, | |
5b4747c5 | 1526 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
da8d02d1 SP |
1527 | .matches = has_cpuid_feature, |
1528 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
1529 | .field_pos = ID_AA64ISAR0_ATOMICS_SHIFT, | |
ff96f7bc | 1530 | .sign = FTR_UNSIGNED, |
2e94da13 WD |
1531 | .min_field_value = 2, |
1532 | }, | |
395af861 | 1533 | #endif /* CONFIG_ARM64_LSE_ATOMICS */ |
d5370f75 WD |
1534 | { |
1535 | .desc = "Software prefetching using PRFM", | |
1536 | .capability = ARM64_HAS_NO_HW_PREFETCH, | |
5c137714 | 1537 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, |
d5370f75 WD |
1538 | .matches = has_no_hw_prefetch, |
1539 | }, | |
57f4959b JM |
1540 | #ifdef CONFIG_ARM64_UAO |
1541 | { | |
1542 | .desc = "User Access Override", | |
1543 | .capability = ARM64_HAS_UAO, | |
5b4747c5 | 1544 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
57f4959b JM |
1545 | .matches = has_cpuid_feature, |
1546 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1547 | .field_pos = ID_AA64MMFR2_UAO_SHIFT, | |
1548 | .min_field_value = 1, | |
c8b06e3f JM |
1549 | /* |
1550 | * We rely on stop_machine() calling uao_thread_switch() to set | |
1551 | * UAO immediately after patching. | |
1552 | */ | |
57f4959b JM |
1553 | }, |
1554 | #endif /* CONFIG_ARM64_UAO */ | |
70544196 JM |
1555 | #ifdef CONFIG_ARM64_PAN |
1556 | { | |
1557 | .capability = ARM64_ALT_PAN_NOT_UAO, | |
5b4747c5 | 1558 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
70544196 JM |
1559 | .matches = cpufeature_pan_not_uao, |
1560 | }, | |
1561 | #endif /* CONFIG_ARM64_PAN */ | |
830dcc9f | 1562 | #ifdef CONFIG_ARM64_VHE |
d88701be MZ |
1563 | { |
1564 | .desc = "Virtualization Host Extensions", | |
1565 | .capability = ARM64_HAS_VIRT_HOST_EXTN, | |
830dcc9f | 1566 | .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, |
d88701be | 1567 | .matches = runs_at_el2, |
c0cda3b8 | 1568 | .cpu_enable = cpu_copy_el2regs, |
d88701be | 1569 | }, |
830dcc9f | 1570 | #endif /* CONFIG_ARM64_VHE */ |
042446a3 SP |
1571 | { |
1572 | .desc = "32-bit EL0 Support", | |
1573 | .capability = ARM64_HAS_32BIT_EL0, | |
5b4747c5 | 1574 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
042446a3 SP |
1575 | .matches = has_cpuid_feature, |
1576 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1577 | .sign = FTR_UNSIGNED, | |
1578 | .field_pos = ID_AA64PFR0_EL0_SHIFT, | |
1579 | .min_field_value = ID_AA64PFR0_EL0_32BIT_64BIT, | |
1580 | }, | |
540f76d1 WD |
1581 | #ifdef CONFIG_KVM |
1582 | { | |
1583 | .desc = "32-bit EL1 Support", | |
1584 | .capability = ARM64_HAS_32BIT_EL1, | |
1585 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1586 | .matches = has_cpuid_feature, | |
1587 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1588 | .sign = FTR_UNSIGNED, | |
1589 | .field_pos = ID_AA64PFR0_EL1_SHIFT, | |
1590 | .min_field_value = ID_AA64PFR0_EL1_32BIT_64BIT, | |
1591 | }, | |
1592 | #endif | |
ea1e3de8 | 1593 | { |
179a56f6 | 1594 | .desc = "Kernel page table isolation (KPTI)", |
ea1e3de8 | 1595 | .capability = ARM64_UNMAP_KERNEL_AT_EL0, |
d3aec8a2 SP |
1596 | .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, |
1597 | /* | |
1598 | * The ID feature fields below are used to indicate that | |
1599 | * the CPU doesn't need KPTI. See unmap_kernel_at_el0 for | |
1600 | * more details. | |
1601 | */ | |
1602 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1603 | .field_pos = ID_AA64PFR0_CSV3_SHIFT, | |
1604 | .min_field_value = 1, | |
ea1e3de8 | 1605 | .matches = unmap_kernel_at_el0, |
c0cda3b8 | 1606 | .cpu_enable = kpti_install_ng_mappings, |
ea1e3de8 | 1607 | }, |
82e0191a SP |
1608 | { |
1609 | /* FP/SIMD is not implemented */ | |
1610 | .capability = ARM64_HAS_NO_FPSIMD, | |
449443c0 | 1611 | .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, |
82e0191a SP |
1612 | .min_field_value = 0, |
1613 | .matches = has_no_fpsimd, | |
1614 | }, | |
d50e071f RM |
1615 | #ifdef CONFIG_ARM64_PMEM |
1616 | { | |
1617 | .desc = "Data cache clean to Point of Persistence", | |
1618 | .capability = ARM64_HAS_DCPOP, | |
5b4747c5 | 1619 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
d50e071f RM |
1620 | .matches = has_cpuid_feature, |
1621 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
1622 | .field_pos = ID_AA64ISAR1_DPB_SHIFT, | |
1623 | .min_field_value = 1, | |
1624 | }, | |
b9585f53 AM |
1625 | { |
1626 | .desc = "Data cache clean to Point of Deep Persistence", | |
1627 | .capability = ARM64_HAS_DCPODP, | |
1628 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1629 | .matches = has_cpuid_feature, | |
1630 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
1631 | .sign = FTR_UNSIGNED, | |
1632 | .field_pos = ID_AA64ISAR1_DPB_SHIFT, | |
1633 | .min_field_value = 2, | |
1634 | }, | |
d50e071f | 1635 | #endif |
43994d82 DM |
1636 | #ifdef CONFIG_ARM64_SVE |
1637 | { | |
1638 | .desc = "Scalable Vector Extension", | |
5b4747c5 | 1639 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
43994d82 | 1640 | .capability = ARM64_SVE, |
43994d82 DM |
1641 | .sys_reg = SYS_ID_AA64PFR0_EL1, |
1642 | .sign = FTR_UNSIGNED, | |
1643 | .field_pos = ID_AA64PFR0_SVE_SHIFT, | |
1644 | .min_field_value = ID_AA64PFR0_SVE, | |
1645 | .matches = has_cpuid_feature, | |
c0cda3b8 | 1646 | .cpu_enable = sve_kernel_enable, |
43994d82 DM |
1647 | }, |
1648 | #endif /* CONFIG_ARM64_SVE */ | |
64c02720 XX |
1649 | #ifdef CONFIG_ARM64_RAS_EXTN |
1650 | { | |
1651 | .desc = "RAS Extension Support", | |
1652 | .capability = ARM64_HAS_RAS_EXTN, | |
5b4747c5 | 1653 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
64c02720 XX |
1654 | .matches = has_cpuid_feature, |
1655 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1656 | .sign = FTR_UNSIGNED, | |
1657 | .field_pos = ID_AA64PFR0_RAS_SHIFT, | |
1658 | .min_field_value = ID_AA64PFR0_RAS_V1, | |
c0cda3b8 | 1659 | .cpu_enable = cpu_clear_disr, |
64c02720 XX |
1660 | }, |
1661 | #endif /* CONFIG_ARM64_RAS_EXTN */ | |
2c9d45b4 IV |
1662 | #ifdef CONFIG_ARM64_AMU_EXTN |
1663 | { | |
1664 | /* | |
1665 | * The feature is enabled by default if CONFIG_ARM64_AMU_EXTN=y. | |
1666 | * Therefore, don't provide .desc as we don't want the detection | |
1667 | * message to be shown until at least one CPU is detected to | |
1668 | * support the feature. | |
1669 | */ | |
1670 | .capability = ARM64_HAS_AMU_EXTN, | |
1671 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, | |
1672 | .matches = has_amu, | |
1673 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1674 | .sign = FTR_UNSIGNED, | |
1675 | .field_pos = ID_AA64PFR0_AMU_SHIFT, | |
1676 | .min_field_value = ID_AA64PFR0_AMU, | |
1677 | .cpu_enable = cpu_amu_enable, | |
1678 | }, | |
1679 | #endif /* CONFIG_ARM64_AMU_EXTN */ | |
6ae4b6e0 SD |
1680 | { |
1681 | .desc = "Data cache clean to the PoU not required for I/D coherence", | |
1682 | .capability = ARM64_HAS_CACHE_IDC, | |
5b4747c5 | 1683 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
6ae4b6e0 | 1684 | .matches = has_cache_idc, |
1602df02 | 1685 | .cpu_enable = cpu_emulate_effective_ctr, |
6ae4b6e0 SD |
1686 | }, |
1687 | { | |
1688 | .desc = "Instruction cache invalidation not required for I/D coherence", | |
1689 | .capability = ARM64_HAS_CACHE_DIC, | |
5b4747c5 | 1690 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, |
6ae4b6e0 SD |
1691 | .matches = has_cache_dic, |
1692 | }, | |
e48d53a9 MZ |
1693 | { |
1694 | .desc = "Stage-2 Force Write-Back", | |
1695 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1696 | .capability = ARM64_HAS_STAGE2_FWB, | |
1697 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1698 | .sign = FTR_UNSIGNED, | |
1699 | .field_pos = ID_AA64MMFR2_FWB_SHIFT, | |
1700 | .min_field_value = 1, | |
1701 | .matches = has_cpuid_feature, | |
1702 | .cpu_enable = cpu_has_fwb, | |
1703 | }, | |
05abb595 SP |
1704 | #ifdef CONFIG_ARM64_HW_AFDBM |
1705 | { | |
1706 | /* | |
1707 | * Since we turn this on always, we don't want the user to | |
1708 | * think that the feature is available when it may not be. | |
1709 | * So hide the description. | |
1710 | * | |
1711 | * .desc = "Hardware pagetable Dirty Bit Management", | |
1712 | * | |
1713 | */ | |
1714 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, | |
1715 | .capability = ARM64_HW_DBM, | |
1716 | .sys_reg = SYS_ID_AA64MMFR1_EL1, | |
1717 | .sign = FTR_UNSIGNED, | |
1718 | .field_pos = ID_AA64MMFR1_HADBS_SHIFT, | |
1719 | .min_field_value = 2, | |
1720 | .matches = has_hw_dbm, | |
1721 | .cpu_enable = cpu_enable_hw_dbm, | |
1722 | }, | |
1723 | #endif | |
86d0dd34 AB |
1724 | { |
1725 | .desc = "CRC32 instructions", | |
1726 | .capability = ARM64_HAS_CRC32, | |
1727 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1728 | .matches = has_cpuid_feature, | |
1729 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
1730 | .field_pos = ID_AA64ISAR0_CRC32_SHIFT, | |
1731 | .min_field_value = 1, | |
1732 | }, | |
4f9f4964 | 1733 | #ifdef CONFIG_ARM64_SSBD |
d71be2b6 WD |
1734 | { |
1735 | .desc = "Speculative Store Bypassing Safe (SSBS)", | |
1736 | .capability = ARM64_SSBS, | |
1737 | .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, | |
1738 | .matches = has_cpuid_feature, | |
1739 | .sys_reg = SYS_ID_AA64PFR1_EL1, | |
1740 | .field_pos = ID_AA64PFR1_SSBS_SHIFT, | |
1741 | .sign = FTR_UNSIGNED, | |
1742 | .min_field_value = ID_AA64PFR1_SSBS_PSTATE_ONLY, | |
8f04e8e6 | 1743 | .cpu_enable = cpu_enable_ssbs, |
d71be2b6 | 1744 | }, |
5ffdfaed VM |
1745 | #endif |
1746 | #ifdef CONFIG_ARM64_CNP | |
1747 | { | |
1748 | .desc = "Common not Private translations", | |
1749 | .capability = ARM64_HAS_CNP, | |
1750 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1751 | .matches = has_useable_cnp, | |
1752 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1753 | .sign = FTR_UNSIGNED, | |
1754 | .field_pos = ID_AA64MMFR2_CNP_SHIFT, | |
1755 | .min_field_value = 1, | |
1756 | .cpu_enable = cpu_enable_cnp, | |
1757 | }, | |
8f04e8e6 | 1758 | #endif |
bd4fb6d2 WD |
1759 | { |
1760 | .desc = "Speculation barrier (SB)", | |
1761 | .capability = ARM64_HAS_SB, | |
1762 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1763 | .matches = has_cpuid_feature, | |
1764 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
1765 | .field_pos = ID_AA64ISAR1_SB_SHIFT, | |
1766 | .sign = FTR_UNSIGNED, | |
1767 | .min_field_value = 1, | |
1768 | }, | |
6984eb47 MR |
1769 | #ifdef CONFIG_ARM64_PTR_AUTH |
1770 | { | |
1771 | .desc = "Address authentication (architected algorithm)", | |
1772 | .capability = ARM64_HAS_ADDRESS_AUTH_ARCH, | |
6982934e | 1773 | .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, |
6984eb47 MR |
1774 | .sys_reg = SYS_ID_AA64ISAR1_EL1, |
1775 | .sign = FTR_UNSIGNED, | |
1776 | .field_pos = ID_AA64ISAR1_APA_SHIFT, | |
1777 | .min_field_value = ID_AA64ISAR1_APA_ARCHITECTED, | |
1778 | .matches = has_cpuid_feature, | |
1779 | }, | |
1780 | { | |
1781 | .desc = "Address authentication (IMP DEF algorithm)", | |
1782 | .capability = ARM64_HAS_ADDRESS_AUTH_IMP_DEF, | |
6982934e | 1783 | .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, |
6984eb47 MR |
1784 | .sys_reg = SYS_ID_AA64ISAR1_EL1, |
1785 | .sign = FTR_UNSIGNED, | |
1786 | .field_pos = ID_AA64ISAR1_API_SHIFT, | |
1787 | .min_field_value = ID_AA64ISAR1_API_IMP_DEF, | |
1788 | .matches = has_cpuid_feature, | |
cfef06bd KM |
1789 | }, |
1790 | { | |
1791 | .capability = ARM64_HAS_ADDRESS_AUTH, | |
6982934e | 1792 | .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, |
cfef06bd | 1793 | .matches = has_address_auth, |
6984eb47 MR |
1794 | }, |
1795 | { | |
1796 | .desc = "Generic authentication (architected algorithm)", | |
1797 | .capability = ARM64_HAS_GENERIC_AUTH_ARCH, | |
1798 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1799 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
1800 | .sign = FTR_UNSIGNED, | |
1801 | .field_pos = ID_AA64ISAR1_GPA_SHIFT, | |
1802 | .min_field_value = ID_AA64ISAR1_GPA_ARCHITECTED, | |
1803 | .matches = has_cpuid_feature, | |
1804 | }, | |
1805 | { | |
1806 | .desc = "Generic authentication (IMP DEF algorithm)", | |
1807 | .capability = ARM64_HAS_GENERIC_AUTH_IMP_DEF, | |
1808 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1809 | .sys_reg = SYS_ID_AA64ISAR1_EL1, | |
1810 | .sign = FTR_UNSIGNED, | |
1811 | .field_pos = ID_AA64ISAR1_GPI_SHIFT, | |
1812 | .min_field_value = ID_AA64ISAR1_GPI_IMP_DEF, | |
1813 | .matches = has_cpuid_feature, | |
1814 | }, | |
cfef06bd KM |
1815 | { |
1816 | .capability = ARM64_HAS_GENERIC_AUTH, | |
1817 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1818 | .matches = has_generic_auth, | |
1819 | }, | |
6984eb47 | 1820 | #endif /* CONFIG_ARM64_PTR_AUTH */ |
b90d2b22 JT |
1821 | #ifdef CONFIG_ARM64_PSEUDO_NMI |
1822 | { | |
1823 | /* | |
1824 | * Depends on having GICv3 | |
1825 | */ | |
1826 | .desc = "IRQ priority masking", | |
1827 | .capability = ARM64_HAS_IRQ_PRIO_MASKING, | |
1828 | .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE, | |
1829 | .matches = can_use_gic_priorities, | |
1830 | .sys_reg = SYS_ID_AA64PFR0_EL1, | |
1831 | .field_pos = ID_AA64PFR0_GIC_SHIFT, | |
1832 | .sign = FTR_UNSIGNED, | |
1833 | .min_field_value = 1, | |
1834 | }, | |
3e6c69a0 MB |
1835 | #endif |
1836 | #ifdef CONFIG_ARM64_E0PD | |
1837 | { | |
1838 | .desc = "E0PD", | |
1839 | .capability = ARM64_HAS_E0PD, | |
1840 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1841 | .sys_reg = SYS_ID_AA64MMFR2_EL1, | |
1842 | .sign = FTR_UNSIGNED, | |
1843 | .field_pos = ID_AA64MMFR2_E0PD_SHIFT, | |
1844 | .matches = has_cpuid_feature, | |
1845 | .min_field_value = 1, | |
1846 | .cpu_enable = cpu_enable_e0pd, | |
1847 | }, | |
bc206065 | 1848 | #endif |
1a50ec0b RH |
1849 | #ifdef CONFIG_ARCH_RANDOM |
1850 | { | |
1851 | .desc = "Random Number Generator", | |
1852 | .capability = ARM64_HAS_RNG, | |
1853 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, | |
1854 | .matches = has_cpuid_feature, | |
1855 | .sys_reg = SYS_ID_AA64ISAR0_EL1, | |
1856 | .field_pos = ID_AA64ISAR0_RNDR_SHIFT, | |
1857 | .sign = FTR_UNSIGNED, | |
1858 | .min_field_value = 1, | |
1859 | }, | |
b90d2b22 | 1860 | #endif |
359b7064 MZ |
1861 | {}, |
1862 | }; | |
1863 | ||
1e013d06 WD |
1864 | #define HWCAP_CPUID_MATCH(reg, field, s, min_value) \ |
1865 | .matches = has_cpuid_feature, \ | |
1866 | .sys_reg = reg, \ | |
1867 | .field_pos = field, \ | |
1868 | .sign = s, \ | |
1869 | .min_field_value = min_value, | |
1870 | ||
1871 | #define __HWCAP_CAP(name, cap_type, cap) \ | |
1872 | .desc = name, \ | |
1873 | .type = ARM64_CPUCAP_SYSTEM_FEATURE, \ | |
1874 | .hwcap_type = cap_type, \ | |
1875 | .hwcap = cap, \ | |
1876 | ||
1877 | #define HWCAP_CAP(reg, field, s, min_value, cap_type, cap) \ | |
1878 | { \ | |
1879 | __HWCAP_CAP(#cap, cap_type, cap) \ | |
1880 | HWCAP_CPUID_MATCH(reg, field, s, min_value) \ | |
37b01d53 SP |
1881 | } |
1882 | ||
1e013d06 WD |
1883 | #define HWCAP_MULTI_CAP(list, cap_type, cap) \ |
1884 | { \ | |
1885 | __HWCAP_CAP(#cap, cap_type, cap) \ | |
1886 | .matches = cpucap_multi_entry_cap_matches, \ | |
1887 | .match_list = list, \ | |
1888 | } | |
1889 | ||
7559950a SP |
1890 | #define HWCAP_CAP_MATCH(match, cap_type, cap) \ |
1891 | { \ | |
1892 | __HWCAP_CAP(#cap, cap_type, cap) \ | |
1893 | .matches = match, \ | |
1894 | } | |
1895 | ||
1e013d06 WD |
1896 | #ifdef CONFIG_ARM64_PTR_AUTH |
1897 | static const struct arm64_cpu_capabilities ptr_auth_hwcap_addr_matches[] = { | |
1898 | { | |
1899 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_APA_SHIFT, | |
1900 | FTR_UNSIGNED, ID_AA64ISAR1_APA_ARCHITECTED) | |
1901 | }, | |
1902 | { | |
1903 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_API_SHIFT, | |
1904 | FTR_UNSIGNED, ID_AA64ISAR1_API_IMP_DEF) | |
1905 | }, | |
1906 | {}, | |
1907 | }; | |
1908 | ||
1909 | static const struct arm64_cpu_capabilities ptr_auth_hwcap_gen_matches[] = { | |
1910 | { | |
1911 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_GPA_SHIFT, | |
1912 | FTR_UNSIGNED, ID_AA64ISAR1_GPA_ARCHITECTED) | |
1913 | }, | |
1914 | { | |
1915 | HWCAP_CPUID_MATCH(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_GPI_SHIFT, | |
1916 | FTR_UNSIGNED, ID_AA64ISAR1_GPI_IMP_DEF) | |
1917 | }, | |
1918 | {}, | |
1919 | }; | |
1920 | #endif | |
1921 | ||
f3efb675 | 1922 | static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { |
aaba098f AM |
1923 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_PMULL), |
1924 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_AES_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_AES), | |
1925 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA1), | |
1926 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA2), | |
1927 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA2_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_SHA512), | |
1928 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_CRC32), | |
1929 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_ATOMICS_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ATOMICS), | |
1930 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_RDM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDRDM), | |
1931 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SHA3_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SHA3), | |
1932 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SM3_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM3), | |
1933 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_SM4_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SM4), | |
1934 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_DP_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDDP), | |
1935 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_FHM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDFHM), | |
1936 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_TS_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FLAGM), | |
12019374 | 1937 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_TS_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_FLAGM2), |
1a50ec0b | 1938 | HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_RNDR_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_RNG), |
aaba098f AM |
1939 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_FP), |
1940 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FPHP), | |
1941 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, KERNEL_HWCAP_ASIMD), | |
1942 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDHP), | |
1943 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_DIT_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DIT), | |
1944 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DCPOP), | |
671db581 | 1945 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_DCPODP), |
aaba098f AM |
1946 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_JSCVT_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_JSCVT), |
1947 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_FCMA_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FCMA), | |
1948 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_LRCPC_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_LRCPC), | |
1949 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_LRCPC_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_ILRCPC), | |
ca9503fc | 1950 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_FRINTTS_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FRINT), |
aaba098f | 1951 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_SB_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SB), |
d4209d8b SP |
1952 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_BF16_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_BF16), |
1953 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DGH_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DGH), | |
1954 | HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_I8MM_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_I8MM), | |
aaba098f | 1955 | HWCAP_CAP(SYS_ID_AA64MMFR2_EL1, ID_AA64MMFR2_AT_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_USCAT), |
43994d82 | 1956 | #ifdef CONFIG_ARM64_SVE |
aaba098f | 1957 | HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_SVE_SHIFT, FTR_UNSIGNED, ID_AA64PFR0_SVE, CAP_HWCAP, KERNEL_HWCAP_SVE), |
06a916fe DM |
1958 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SVEVER_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SVEVER_SVE2, CAP_HWCAP, KERNEL_HWCAP_SVE2), |
1959 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_AES_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_AES, CAP_HWCAP, KERNEL_HWCAP_SVEAES), | |
1960 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_AES_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_AES_PMULL, CAP_HWCAP, KERNEL_HWCAP_SVEPMULL), | |
1961 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_BITPERM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_BITPERM, CAP_HWCAP, KERNEL_HWCAP_SVEBITPERM), | |
d4209d8b | 1962 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_BF16_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_BF16, CAP_HWCAP, KERNEL_HWCAP_SVEBF16), |
06a916fe DM |
1963 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SHA3_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SHA3, CAP_HWCAP, KERNEL_HWCAP_SVESHA3), |
1964 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_SM4_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_SM4, CAP_HWCAP, KERNEL_HWCAP_SVESM4), | |
d4209d8b SP |
1965 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_I8MM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_I8MM, CAP_HWCAP, KERNEL_HWCAP_SVEI8MM), |
1966 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_F32MM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_F32MM, CAP_HWCAP, KERNEL_HWCAP_SVEF32MM), | |
1967 | HWCAP_CAP(SYS_ID_AA64ZFR0_EL1, ID_AA64ZFR0_F64MM_SHIFT, FTR_UNSIGNED, ID_AA64ZFR0_F64MM, CAP_HWCAP, KERNEL_HWCAP_SVEF64MM), | |
43994d82 | 1968 | #endif |
aaba098f | 1969 | HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_SSBS_SHIFT, FTR_UNSIGNED, ID_AA64PFR1_SSBS_PSTATE_INSNS, CAP_HWCAP, KERNEL_HWCAP_SSBS), |
75031975 | 1970 | #ifdef CONFIG_ARM64_PTR_AUTH |
aaba098f AM |
1971 | HWCAP_MULTI_CAP(ptr_auth_hwcap_addr_matches, CAP_HWCAP, KERNEL_HWCAP_PACA), |
1972 | HWCAP_MULTI_CAP(ptr_auth_hwcap_gen_matches, CAP_HWCAP, KERNEL_HWCAP_PACG), | |
75031975 | 1973 | #endif |
75283501 SP |
1974 | {}, |
1975 | }; | |
1976 | ||
7559950a SP |
1977 | #ifdef CONFIG_COMPAT |
1978 | static bool compat_has_neon(const struct arm64_cpu_capabilities *cap, int scope) | |
1979 | { | |
1980 | /* | |
1981 | * Check that all of MVFR1_EL1.{SIMDSP, SIMDInt, SIMDLS} are available, | |
1982 | * in line with that of arm32 as in vfp_init(). We make sure that the | |
1983 | * check is future proof, by making sure value is non-zero. | |
1984 | */ | |
1985 | u32 mvfr1; | |
1986 | ||
1987 | WARN_ON(scope == SCOPE_LOCAL_CPU && preemptible()); | |
1988 | if (scope == SCOPE_SYSTEM) | |
1989 | mvfr1 = read_sanitised_ftr_reg(SYS_MVFR1_EL1); | |
1990 | else | |
1991 | mvfr1 = read_sysreg_s(SYS_MVFR1_EL1); | |
1992 | ||
1993 | return cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDSP_SHIFT) && | |
1994 | cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDINT_SHIFT) && | |
1995 | cpuid_feature_extract_unsigned_field(mvfr1, MVFR1_SIMDLS_SHIFT); | |
1996 | } | |
1997 | #endif | |
1998 | ||
75283501 | 1999 | static const struct arm64_cpu_capabilities compat_elf_hwcaps[] = { |
37b01d53 | 2000 | #ifdef CONFIG_COMPAT |
7559950a SP |
2001 | HWCAP_CAP_MATCH(compat_has_neon, CAP_COMPAT_HWCAP, COMPAT_HWCAP_NEON), |
2002 | HWCAP_CAP(SYS_MVFR1_EL1, MVFR1_SIMDFMAC_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv4), | |
2003 | /* Arm v8 mandates MVFR0.FPDP == {0, 2}. So, piggy back on this for the presence of VFP support */ | |
2004 | HWCAP_CAP(SYS_MVFR0_EL1, MVFR0_FPDP_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFP), | |
2005 | HWCAP_CAP(SYS_MVFR0_EL1, MVFR0_FPDP_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP, COMPAT_HWCAP_VFPv3), | |
ff96f7bc SP |
2006 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL), |
2007 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES), | |
2008 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA1_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA1), | |
2009 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_SHA2_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_SHA2), | |
2010 | HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_CRC32), | |
37b01d53 SP |
2011 | #endif |
2012 | {}, | |
2013 | }; | |
2014 | ||
f3efb675 | 2015 | static void __init cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap) |
37b01d53 SP |
2016 | { |
2017 | switch (cap->hwcap_type) { | |
2018 | case CAP_HWCAP: | |
aaba098f | 2019 | cpu_set_feature(cap->hwcap); |
37b01d53 SP |
2020 | break; |
2021 | #ifdef CONFIG_COMPAT | |
2022 | case CAP_COMPAT_HWCAP: | |
2023 | compat_elf_hwcap |= (u32)cap->hwcap; | |
2024 | break; | |
2025 | case CAP_COMPAT_HWCAP2: | |
2026 | compat_elf_hwcap2 |= (u32)cap->hwcap; | |
2027 | break; | |
2028 | #endif | |
2029 | default: | |
2030 | WARN_ON(1); | |
2031 | break; | |
2032 | } | |
2033 | } | |
2034 | ||
2035 | /* Check if we have a particular HWCAP enabled */ | |
f3efb675 | 2036 | static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap) |
37b01d53 SP |
2037 | { |
2038 | bool rc; | |
2039 | ||
2040 | switch (cap->hwcap_type) { | |
2041 | case CAP_HWCAP: | |
aaba098f | 2042 | rc = cpu_have_feature(cap->hwcap); |
37b01d53 SP |
2043 | break; |
2044 | #ifdef CONFIG_COMPAT | |
2045 | case CAP_COMPAT_HWCAP: | |
2046 | rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0; | |
2047 | break; | |
2048 | case CAP_COMPAT_HWCAP2: | |
2049 | rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0; | |
2050 | break; | |
2051 | #endif | |
2052 | default: | |
2053 | WARN_ON(1); | |
2054 | rc = false; | |
2055 | } | |
2056 | ||
2057 | return rc; | |
2058 | } | |
2059 | ||
75283501 | 2060 | static void __init setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps) |
37b01d53 | 2061 | { |
77c97b4e | 2062 | /* We support emulation of accesses to CPU ID feature registers */ |
aaba098f | 2063 | cpu_set_named_feature(CPUID); |
75283501 | 2064 | for (; hwcaps->matches; hwcaps++) |
143ba05d | 2065 | if (hwcaps->matches(hwcaps, cpucap_default_scope(hwcaps))) |
75283501 | 2066 | cap_set_elf_hwcap(hwcaps); |
37b01d53 SP |
2067 | } |
2068 | ||
606f8e7b | 2069 | static void update_cpu_capabilities(u16 scope_mask) |
67948af4 | 2070 | { |
606f8e7b | 2071 | int i; |
67948af4 SP |
2072 | const struct arm64_cpu_capabilities *caps; |
2073 | ||
cce360b5 | 2074 | scope_mask &= ARM64_CPUCAP_SCOPE_MASK; |
606f8e7b SP |
2075 | for (i = 0; i < ARM64_NCAPS; i++) { |
2076 | caps = cpu_hwcaps_ptrs[i]; | |
2077 | if (!caps || !(caps->type & scope_mask) || | |
2078 | cpus_have_cap(caps->capability) || | |
cce360b5 | 2079 | !caps->matches(caps, cpucap_default_scope(caps))) |
359b7064 MZ |
2080 | continue; |
2081 | ||
606f8e7b SP |
2082 | if (caps->desc) |
2083 | pr_info("detected: %s\n", caps->desc); | |
75283501 | 2084 | cpus_set_cap(caps->capability); |
0ceb0d56 DT |
2085 | |
2086 | if ((scope_mask & SCOPE_BOOT_CPU) && (caps->type & SCOPE_BOOT_CPU)) | |
2087 | set_bit(caps->capability, boot_capabilities); | |
359b7064 | 2088 | } |
ce8b602c SP |
2089 | } |
2090 | ||
0b587c84 SP |
2091 | /* |
2092 | * Enable all the available capabilities on this CPU. The capabilities | |
2093 | * with BOOT_CPU scope are handled separately and hence skipped here. | |
2094 | */ | |
2095 | static int cpu_enable_non_boot_scope_capabilities(void *__unused) | |
ed478b3f | 2096 | { |
0b587c84 SP |
2097 | int i; |
2098 | u16 non_boot_scope = SCOPE_ALL & ~SCOPE_BOOT_CPU; | |
ed478b3f | 2099 | |
0b587c84 SP |
2100 | for_each_available_cap(i) { |
2101 | const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[i]; | |
2102 | ||
2103 | if (WARN_ON(!cap)) | |
2104 | continue; | |
c0cda3b8 | 2105 | |
0b587c84 SP |
2106 | if (!(cap->type & non_boot_scope)) |
2107 | continue; | |
2108 | ||
2109 | if (cap->cpu_enable) | |
2110 | cap->cpu_enable(cap); | |
2111 | } | |
c0cda3b8 DM |
2112 | return 0; |
2113 | } | |
2114 | ||
ce8b602c | 2115 | /* |
dbb4e152 SP |
2116 | * Run through the enabled capabilities and enable() it on all active |
2117 | * CPUs | |
ce8b602c | 2118 | */ |
0b587c84 | 2119 | static void __init enable_cpu_capabilities(u16 scope_mask) |
ce8b602c | 2120 | { |
0b587c84 SP |
2121 | int i; |
2122 | const struct arm64_cpu_capabilities *caps; | |
2123 | bool boot_scope; | |
2124 | ||
cce360b5 | 2125 | scope_mask &= ARM64_CPUCAP_SCOPE_MASK; |
0b587c84 | 2126 | boot_scope = !!(scope_mask & SCOPE_BOOT_CPU); |
63a1e1c9 | 2127 | |
0b587c84 SP |
2128 | for (i = 0; i < ARM64_NCAPS; i++) { |
2129 | unsigned int num; | |
2130 | ||
2131 | caps = cpu_hwcaps_ptrs[i]; | |
2132 | if (!caps || !(caps->type & scope_mask)) | |
2133 | continue; | |
2134 | num = caps->capability; | |
2135 | if (!cpus_have_cap(num)) | |
63a1e1c9 MR |
2136 | continue; |
2137 | ||
2138 | /* Ensure cpus_have_const_cap(num) works */ | |
2139 | static_branch_enable(&cpu_hwcap_keys[num]); | |
2140 | ||
0b587c84 | 2141 | if (boot_scope && caps->cpu_enable) |
2a6dcb2b | 2142 | /* |
fd9d63da SP |
2143 | * Capabilities with SCOPE_BOOT_CPU scope are finalised |
2144 | * before any secondary CPU boots. Thus, each secondary | |
2145 | * will enable the capability as appropriate via | |
2146 | * check_local_cpu_capabilities(). The only exception is | |
2147 | * the boot CPU, for which the capability must be | |
2148 | * enabled here. This approach avoids costly | |
2149 | * stop_machine() calls for this case. | |
2a6dcb2b | 2150 | */ |
0b587c84 | 2151 | caps->cpu_enable(caps); |
63a1e1c9 | 2152 | } |
dbb4e152 | 2153 | |
0b587c84 SP |
2154 | /* |
2155 | * For all non-boot scope capabilities, use stop_machine() | |
2156 | * as it schedules the work allowing us to modify PSTATE, | |
2157 | * instead of on_each_cpu() which uses an IPI, giving us a | |
2158 | * PSTATE that disappears when we return. | |
2159 | */ | |
2160 | if (!boot_scope) | |
2161 | stop_machine(cpu_enable_non_boot_scope_capabilities, | |
2162 | NULL, cpu_online_mask); | |
ed478b3f SP |
2163 | } |
2164 | ||
eaac4d83 SP |
2165 | /* |
2166 | * Run through the list of capabilities to check for conflicts. | |
2167 | * If the system has already detected a capability, take necessary | |
2168 | * action on this CPU. | |
eaac4d83 | 2169 | */ |
deeaac51 | 2170 | static void verify_local_cpu_caps(u16 scope_mask) |
eaac4d83 | 2171 | { |
606f8e7b | 2172 | int i; |
eaac4d83 | 2173 | bool cpu_has_cap, system_has_cap; |
606f8e7b | 2174 | const struct arm64_cpu_capabilities *caps; |
eaac4d83 | 2175 | |
cce360b5 SP |
2176 | scope_mask &= ARM64_CPUCAP_SCOPE_MASK; |
2177 | ||
606f8e7b SP |
2178 | for (i = 0; i < ARM64_NCAPS; i++) { |
2179 | caps = cpu_hwcaps_ptrs[i]; | |
2180 | if (!caps || !(caps->type & scope_mask)) | |
cce360b5 SP |
2181 | continue; |
2182 | ||
ba7d9233 | 2183 | cpu_has_cap = caps->matches(caps, SCOPE_LOCAL_CPU); |
eaac4d83 SP |
2184 | system_has_cap = cpus_have_cap(caps->capability); |
2185 | ||
2186 | if (system_has_cap) { | |
2187 | /* | |
2188 | * Check if the new CPU misses an advertised feature, | |
2189 | * which is not safe to miss. | |
2190 | */ | |
2191 | if (!cpu_has_cap && !cpucap_late_cpu_optional(caps)) | |
2192 | break; | |
2193 | /* | |
2194 | * We have to issue cpu_enable() irrespective of | |
2195 | * whether the CPU has it or not, as it is enabeld | |
2196 | * system wide. It is upto the call back to take | |
2197 | * appropriate action on this CPU. | |
2198 | */ | |
2199 | if (caps->cpu_enable) | |
2200 | caps->cpu_enable(caps); | |
2201 | } else { | |
2202 | /* | |
2203 | * Check if the CPU has this capability if it isn't | |
2204 | * safe to have when the system doesn't. | |
2205 | */ | |
2206 | if (cpu_has_cap && !cpucap_late_cpu_permitted(caps)) | |
2207 | break; | |
2208 | } | |
2209 | } | |
2210 | ||
606f8e7b | 2211 | if (i < ARM64_NCAPS) { |
eaac4d83 SP |
2212 | pr_crit("CPU%d: Detected conflict for capability %d (%s), System: %d, CPU: %d\n", |
2213 | smp_processor_id(), caps->capability, | |
2214 | caps->desc, system_has_cap, cpu_has_cap); | |
eaac4d83 | 2215 | |
deeaac51 KM |
2216 | if (cpucap_panic_on_conflict(caps)) |
2217 | cpu_panic_kernel(); | |
2218 | else | |
2219 | cpu_die_early(); | |
2220 | } | |
eaac4d83 SP |
2221 | } |
2222 | ||
dbb4e152 | 2223 | /* |
13f417f3 SP |
2224 | * Check for CPU features that are used in early boot |
2225 | * based on the Boot CPU value. | |
dbb4e152 | 2226 | */ |
13f417f3 | 2227 | static void check_early_cpu_features(void) |
dbb4e152 | 2228 | { |
13f417f3 | 2229 | verify_cpu_asid_bits(); |
deeaac51 KM |
2230 | |
2231 | verify_local_cpu_caps(SCOPE_BOOT_CPU); | |
dbb4e152 | 2232 | } |
1c076303 | 2233 | |
75283501 SP |
2234 | static void |
2235 | verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps) | |
2236 | { | |
2237 | ||
92406f0c SP |
2238 | for (; caps->matches; caps++) |
2239 | if (cpus_have_elf_hwcap(caps) && !caps->matches(caps, SCOPE_LOCAL_CPU)) { | |
75283501 SP |
2240 | pr_crit("CPU%d: missing HWCAP: %s\n", |
2241 | smp_processor_id(), caps->desc); | |
2242 | cpu_die_early(); | |
2243 | } | |
75283501 SP |
2244 | } |
2245 | ||
2e0f2478 DM |
2246 | static void verify_sve_features(void) |
2247 | { | |
2248 | u64 safe_zcr = read_sanitised_ftr_reg(SYS_ZCR_EL1); | |
2249 | u64 zcr = read_zcr_features(); | |
2250 | ||
2251 | unsigned int safe_len = safe_zcr & ZCR_ELx_LEN_MASK; | |
2252 | unsigned int len = zcr & ZCR_ELx_LEN_MASK; | |
2253 | ||
2254 | if (len < safe_len || sve_verify_vq_map()) { | |
d06b76be | 2255 | pr_crit("CPU%d: SVE: vector length support mismatch\n", |
2e0f2478 DM |
2256 | smp_processor_id()); |
2257 | cpu_die_early(); | |
2258 | } | |
2259 | ||
2260 | /* Add checks on other ZCR bits here if necessary */ | |
2261 | } | |
2262 | ||
1e89baed | 2263 | |
dbb4e152 SP |
2264 | /* |
2265 | * Run through the enabled system capabilities and enable() it on this CPU. | |
2266 | * The capabilities were decided based on the available CPUs at the boot time. | |
2267 | * Any new CPU should match the system wide status of the capability. If the | |
2268 | * new CPU doesn't have a capability which the system now has enabled, we | |
2269 | * cannot do anything to fix it up and could cause unexpected failures. So | |
2270 | * we park the CPU. | |
2271 | */ | |
c47a1900 | 2272 | static void verify_local_cpu_capabilities(void) |
dbb4e152 | 2273 | { |
fd9d63da SP |
2274 | /* |
2275 | * The capabilities with SCOPE_BOOT_CPU are checked from | |
2276 | * check_early_cpu_features(), as they need to be verified | |
2277 | * on all secondary CPUs. | |
2278 | */ | |
deeaac51 | 2279 | verify_local_cpu_caps(SCOPE_ALL & ~SCOPE_BOOT_CPU); |
ed478b3f | 2280 | |
c47a1900 | 2281 | verify_local_elf_hwcaps(arm64_elf_hwcaps); |
2e0f2478 | 2282 | |
c47a1900 SP |
2283 | if (system_supports_32bit_el0()) |
2284 | verify_local_elf_hwcaps(compat_elf_hwcaps); | |
2e0f2478 DM |
2285 | |
2286 | if (system_supports_sve()) | |
2287 | verify_sve_features(); | |
c47a1900 | 2288 | } |
dbb4e152 | 2289 | |
c47a1900 SP |
2290 | void check_local_cpu_capabilities(void) |
2291 | { | |
2292 | /* | |
2293 | * All secondary CPUs should conform to the early CPU features | |
2294 | * in use by the kernel based on boot CPU. | |
2295 | */ | |
13f417f3 SP |
2296 | check_early_cpu_features(); |
2297 | ||
dbb4e152 | 2298 | /* |
c47a1900 | 2299 | * If we haven't finalised the system capabilities, this CPU gets |
fbd890b9 | 2300 | * a chance to update the errata work arounds and local features. |
c47a1900 SP |
2301 | * Otherwise, this CPU should verify that it has all the system |
2302 | * advertised capabilities. | |
dbb4e152 | 2303 | */ |
b51c6ac2 | 2304 | if (!system_capabilities_finalized()) |
ed478b3f SP |
2305 | update_cpu_capabilities(SCOPE_LOCAL_CPU); |
2306 | else | |
c47a1900 | 2307 | verify_local_cpu_capabilities(); |
359b7064 MZ |
2308 | } |
2309 | ||
fd9d63da SP |
2310 | static void __init setup_boot_cpu_capabilities(void) |
2311 | { | |
2312 | /* Detect capabilities with either SCOPE_BOOT_CPU or SCOPE_LOCAL_CPU */ | |
2313 | update_cpu_capabilities(SCOPE_BOOT_CPU | SCOPE_LOCAL_CPU); | |
2314 | /* Enable the SCOPE_BOOT_CPU capabilities alone right away */ | |
2315 | enable_cpu_capabilities(SCOPE_BOOT_CPU); | |
2316 | } | |
2317 | ||
f7bfc14a | 2318 | bool this_cpu_has_cap(unsigned int n) |
8f413758 | 2319 | { |
f7bfc14a SP |
2320 | if (!WARN_ON(preemptible()) && n < ARM64_NCAPS) { |
2321 | const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[n]; | |
2322 | ||
2323 | if (cap) | |
2324 | return cap->matches(cap, SCOPE_LOCAL_CPU); | |
2325 | } | |
2326 | ||
2327 | return false; | |
8f413758 MZ |
2328 | } |
2329 | ||
3ff047f6 ADK |
2330 | /* |
2331 | * This helper function is used in a narrow window when, | |
2332 | * - The system wide safe registers are set with all the SMP CPUs and, | |
2333 | * - The SYSTEM_FEATURE cpu_hwcaps may not have been set. | |
2334 | * In all other cases cpus_have_{const_}cap() should be used. | |
2335 | */ | |
2336 | static bool __system_matches_cap(unsigned int n) | |
2337 | { | |
2338 | if (n < ARM64_NCAPS) { | |
2339 | const struct arm64_cpu_capabilities *cap = cpu_hwcaps_ptrs[n]; | |
2340 | ||
2341 | if (cap) | |
2342 | return cap->matches(cap, SCOPE_SYSTEM); | |
2343 | } | |
2344 | return false; | |
2345 | } | |
2346 | ||
aec0bff7 AM |
2347 | void cpu_set_feature(unsigned int num) |
2348 | { | |
2349 | WARN_ON(num >= MAX_CPU_FEATURES); | |
2350 | elf_hwcap |= BIT(num); | |
2351 | } | |
2352 | EXPORT_SYMBOL_GPL(cpu_set_feature); | |
2353 | ||
2354 | bool cpu_have_feature(unsigned int num) | |
2355 | { | |
2356 | WARN_ON(num >= MAX_CPU_FEATURES); | |
2357 | return elf_hwcap & BIT(num); | |
2358 | } | |
2359 | EXPORT_SYMBOL_GPL(cpu_have_feature); | |
2360 | ||
2361 | unsigned long cpu_get_elf_hwcap(void) | |
2362 | { | |
2363 | /* | |
2364 | * We currently only populate the first 32 bits of AT_HWCAP. Please | |
2365 | * note that for userspace compatibility we guarantee that bits 62 | |
2366 | * and 63 will always be returned as 0. | |
2367 | */ | |
2368 | return lower_32_bits(elf_hwcap); | |
2369 | } | |
2370 | ||
2371 | unsigned long cpu_get_elf_hwcap2(void) | |
2372 | { | |
2373 | return upper_32_bits(elf_hwcap); | |
2374 | } | |
2375 | ||
ed478b3f SP |
2376 | static void __init setup_system_capabilities(void) |
2377 | { | |
2378 | /* | |
2379 | * We have finalised the system-wide safe feature | |
2380 | * registers, finalise the capabilities that depend | |
fd9d63da SP |
2381 | * on it. Also enable all the available capabilities, |
2382 | * that are not enabled already. | |
ed478b3f SP |
2383 | */ |
2384 | update_cpu_capabilities(SCOPE_SYSTEM); | |
fd9d63da | 2385 | enable_cpu_capabilities(SCOPE_ALL & ~SCOPE_BOOT_CPU); |
ed478b3f SP |
2386 | } |
2387 | ||
9cdf8ec4 | 2388 | void __init setup_cpu_features(void) |
359b7064 | 2389 | { |
9cdf8ec4 | 2390 | u32 cwg; |
9cdf8ec4 | 2391 | |
ed478b3f | 2392 | setup_system_capabilities(); |
75283501 | 2393 | setup_elf_hwcaps(arm64_elf_hwcaps); |
643d703d SP |
2394 | |
2395 | if (system_supports_32bit_el0()) | |
2396 | setup_elf_hwcaps(compat_elf_hwcaps); | |
dbb4e152 | 2397 | |
2e6f549f KC |
2398 | if (system_uses_ttbr0_pan()) |
2399 | pr_info("emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching\n"); | |
2400 | ||
2e0f2478 | 2401 | sve_setup(); |
94b07c1f | 2402 | minsigstksz_setup(); |
2e0f2478 | 2403 | |
dbb4e152 | 2404 | /* Advertise that we have computed the system capabilities */ |
b51c6ac2 | 2405 | finalize_system_capabilities(); |
dbb4e152 | 2406 | |
9cdf8ec4 SP |
2407 | /* |
2408 | * Check for sane CTR_EL0.CWG value. | |
2409 | */ | |
2410 | cwg = cache_type_cwg(); | |
9cdf8ec4 | 2411 | if (!cwg) |
ebc7e21e CM |
2412 | pr_warn("No Cache Writeback Granule information, assuming %d\n", |
2413 | ARCH_DMA_MINALIGN); | |
359b7064 | 2414 | } |
70544196 JM |
2415 | |
2416 | static bool __maybe_unused | |
92406f0c | 2417 | cpufeature_pan_not_uao(const struct arm64_cpu_capabilities *entry, int __unused) |
70544196 | 2418 | { |
3ff047f6 | 2419 | return (__system_matches_cap(ARM64_HAS_PAN) && !__system_matches_cap(ARM64_HAS_UAO)); |
70544196 | 2420 | } |
77c97b4e | 2421 | |
5ffdfaed VM |
2422 | static void __maybe_unused cpu_enable_cnp(struct arm64_cpu_capabilities const *cap) |
2423 | { | |
2424 | cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); | |
2425 | } | |
2426 | ||
77c97b4e SP |
2427 | /* |
2428 | * We emulate only the following system register space. | |
2429 | * Op0 = 0x3, CRn = 0x0, Op1 = 0x0, CRm = [0, 4 - 7] | |
2430 | * See Table C5-6 System instruction encodings for System register accesses, | |
2431 | * ARMv8 ARM(ARM DDI 0487A.f) for more details. | |
2432 | */ | |
2433 | static inline bool __attribute_const__ is_emulated(u32 id) | |
2434 | { | |
2435 | return (sys_reg_Op0(id) == 0x3 && | |
2436 | sys_reg_CRn(id) == 0x0 && | |
2437 | sys_reg_Op1(id) == 0x0 && | |
2438 | (sys_reg_CRm(id) == 0 || | |
2439 | ((sys_reg_CRm(id) >= 4) && (sys_reg_CRm(id) <= 7)))); | |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * With CRm == 0, reg should be one of : | |
2444 | * MIDR_EL1, MPIDR_EL1 or REVIDR_EL1. | |
2445 | */ | |
2446 | static inline int emulate_id_reg(u32 id, u64 *valp) | |
2447 | { | |
2448 | switch (id) { | |
2449 | case SYS_MIDR_EL1: | |
2450 | *valp = read_cpuid_id(); | |
2451 | break; | |
2452 | case SYS_MPIDR_EL1: | |
2453 | *valp = SYS_MPIDR_SAFE_VAL; | |
2454 | break; | |
2455 | case SYS_REVIDR_EL1: | |
2456 | /* IMPLEMENTATION DEFINED values are emulated with 0 */ | |
2457 | *valp = 0; | |
2458 | break; | |
2459 | default: | |
2460 | return -EINVAL; | |
2461 | } | |
2462 | ||
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | static int emulate_sys_reg(u32 id, u64 *valp) | |
2467 | { | |
2468 | struct arm64_ftr_reg *regp; | |
2469 | ||
2470 | if (!is_emulated(id)) | |
2471 | return -EINVAL; | |
2472 | ||
2473 | if (sys_reg_CRm(id) == 0) | |
2474 | return emulate_id_reg(id, valp); | |
2475 | ||
2476 | regp = get_arm64_ftr_reg(id); | |
2477 | if (regp) | |
2478 | *valp = arm64_ftr_reg_user_value(regp); | |
2479 | else | |
2480 | /* | |
2481 | * The untracked registers are either IMPLEMENTATION DEFINED | |
2482 | * (e.g, ID_AFR0_EL1) or reserved RAZ. | |
2483 | */ | |
2484 | *valp = 0; | |
2485 | return 0; | |
2486 | } | |
2487 | ||
520ad988 | 2488 | int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt) |
77c97b4e SP |
2489 | { |
2490 | int rc; | |
77c97b4e SP |
2491 | u64 val; |
2492 | ||
77c97b4e SP |
2493 | rc = emulate_sys_reg(sys_reg, &val); |
2494 | if (!rc) { | |
520ad988 | 2495 | pt_regs_write_reg(regs, rt, val); |
6436beee | 2496 | arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); |
77c97b4e | 2497 | } |
77c97b4e SP |
2498 | return rc; |
2499 | } | |
2500 | ||
520ad988 AK |
2501 | static int emulate_mrs(struct pt_regs *regs, u32 insn) |
2502 | { | |
2503 | u32 sys_reg, rt; | |
2504 | ||
2505 | /* | |
2506 | * sys_reg values are defined as used in mrs/msr instruction. | |
2507 | * shift the imm value to get the encoding. | |
2508 | */ | |
2509 | sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5; | |
2510 | rt = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn); | |
2511 | return do_emulate_mrs(regs, sys_reg, rt); | |
2512 | } | |
2513 | ||
77c97b4e SP |
2514 | static struct undef_hook mrs_hook = { |
2515 | .instr_mask = 0xfff00000, | |
2516 | .instr_val = 0xd5300000, | |
d64567f6 | 2517 | .pstate_mask = PSR_AA32_MODE_MASK, |
77c97b4e SP |
2518 | .pstate_val = PSR_MODE_EL0t, |
2519 | .fn = emulate_mrs, | |
2520 | }; | |
2521 | ||
2522 | static int __init enable_mrs_emulation(void) | |
2523 | { | |
2524 | register_undef_hook(&mrs_hook); | |
2525 | return 0; | |
2526 | } | |
2527 | ||
c0d8832e | 2528 | core_initcall(enable_mrs_emulation); |
1b3ccf4b JL |
2529 | |
2530 | ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, | |
2531 | char *buf) | |
2532 | { | |
2533 | if (__meltdown_safe) | |
2534 | return sprintf(buf, "Not affected\n"); | |
2535 | ||
2536 | if (arm64_kernel_unmapped_at_el0()) | |
2537 | return sprintf(buf, "Mitigation: PTI\n"); | |
2538 | ||
2539 | return sprintf(buf, "Vulnerable\n"); | |
2540 | } |