2 * Contains CPU feature definitions
4 * Copyright (C) 2015 ARM Ltd.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #define pr_fmt(fmt) "CPU features: " fmt
21 #include <linux/bsearch.h>
22 #include <linux/sort.h>
23 #include <linux/types.h>
25 #include <asm/cpufeature.h>
26 #include <asm/cpu_ops.h>
27 #include <asm/mmu_context.h>
28 #include <asm/processor.h>
29 #include <asm/sysreg.h>
31 unsigned long elf_hwcap __read_mostly
;
32 EXPORT_SYMBOL_GPL(elf_hwcap
);
35 #define COMPAT_ELF_HWCAP_DEFAULT \
36 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
37 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
38 COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
39 COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
40 COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\
42 unsigned int compat_elf_hwcap __read_mostly
= COMPAT_ELF_HWCAP_DEFAULT
;
43 unsigned int compat_elf_hwcap2 __read_mostly
;
46 DECLARE_BITMAP(cpu_hwcaps
, ARM64_NCAPS
);
48 #define __ARM64_FTR_BITS(SIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \
55 .safe_val = SAFE_VAL, \
58 /* Define a feature with unsigned values */
59 #define ARM64_FTR_BITS(STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \
60 __ARM64_FTR_BITS(FTR_UNSIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL)
62 /* Define a feature with a signed value */
63 #define S_ARM64_FTR_BITS(STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL) \
64 __ARM64_FTR_BITS(FTR_SIGNED, STRICT, TYPE, SHIFT, WIDTH, SAFE_VAL)
66 #define ARM64_FTR_END \
71 /* meta feature for alternatives */
72 static bool __maybe_unused
73 cpufeature_pan_not_uao(const struct arm64_cpu_capabilities
*entry
);
75 static struct arm64_ftr_bits ftr_id_aa64isar0
[] = {
76 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 32, 32, 0),
77 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64ISAR0_RDM_SHIFT
, 4, 0),
78 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 24, 4, 0),
79 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64ISAR0_ATOMICS_SHIFT
, 4, 0),
80 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64ISAR0_CRC32_SHIFT
, 4, 0),
81 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64ISAR0_SHA2_SHIFT
, 4, 0),
82 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64ISAR0_SHA1_SHIFT
, 4, 0),
83 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64ISAR0_AES_SHIFT
, 4, 0),
84 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 4, 0), /* RAZ */
88 static struct arm64_ftr_bits ftr_id_aa64pfr0
[] = {
89 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 32, 32, 0),
90 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 28, 4, 0),
91 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64PFR0_GIC_SHIFT
, 4, 0),
92 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64PFR0_ASIMD_SHIFT
, 4, ID_AA64PFR0_ASIMD_NI
),
93 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64PFR0_FP_SHIFT
, 4, ID_AA64PFR0_FP_NI
),
94 /* Linux doesn't care about the EL3 */
95 ARM64_FTR_BITS(FTR_NONSTRICT
, FTR_EXACT
, ID_AA64PFR0_EL3_SHIFT
, 4, 0),
96 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64PFR0_EL2_SHIFT
, 4, 0),
97 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64PFR0_EL1_SHIFT
, 4, ID_AA64PFR0_EL1_64BIT_ONLY
),
98 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64PFR0_EL0_SHIFT
, 4, ID_AA64PFR0_EL0_64BIT_ONLY
),
102 static struct arm64_ftr_bits ftr_id_aa64mmfr0
[] = {
103 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 32, 32, 0),
104 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR0_TGRAN4_SHIFT
, 4, ID_AA64MMFR0_TGRAN4_NI
),
105 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR0_TGRAN64_SHIFT
, 4, ID_AA64MMFR0_TGRAN64_NI
),
106 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR0_TGRAN16_SHIFT
, 4, ID_AA64MMFR0_TGRAN16_NI
),
107 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR0_BIGENDEL0_SHIFT
, 4, 0),
108 /* Linux shouldn't care about secure memory */
109 ARM64_FTR_BITS(FTR_NONSTRICT
, FTR_EXACT
, ID_AA64MMFR0_SNSMEM_SHIFT
, 4, 0),
110 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR0_BIGENDEL_SHIFT
, 4, 0),
111 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR0_ASID_SHIFT
, 4, 0),
113 * Differing PARange is fine as long as all peripherals and memory are mapped
114 * within the minimum PARange of all CPUs
116 ARM64_FTR_BITS(FTR_NONSTRICT
, FTR_LOWER_SAFE
, ID_AA64MMFR0_PARANGE_SHIFT
, 4, 0),
120 static struct arm64_ftr_bits ftr_id_aa64mmfr1
[] = {
121 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 32, 32, 0),
122 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64MMFR1_PAN_SHIFT
, 4, 0),
123 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR1_LOR_SHIFT
, 4, 0),
124 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR1_HPD_SHIFT
, 4, 0),
125 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR1_VHE_SHIFT
, 4, 0),
126 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR1_VMIDBITS_SHIFT
, 4, 0),
127 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR1_HADBS_SHIFT
, 4, 0),
131 static struct arm64_ftr_bits ftr_id_aa64mmfr2
[] = {
132 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64MMFR2_UAO_SHIFT
, 4, 0),
136 static struct arm64_ftr_bits ftr_ctr
[] = {
137 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 31, 1, 1), /* RAO */
138 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 28, 3, 0),
139 ARM64_FTR_BITS(FTR_STRICT
, FTR_HIGHER_SAFE
, 24, 4, 0), /* CWG */
140 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 20, 4, 0), /* ERG */
141 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 16, 4, 1), /* DminLine */
143 * Linux can handle differing I-cache policies. Userspace JITs will
144 * make use of *minLine
146 ARM64_FTR_BITS(FTR_NONSTRICT
, FTR_EXACT
, 14, 2, 0), /* L1Ip */
147 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 4, 10, 0), /* RAZ */
148 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 0, 4, 0), /* IminLine */
152 static struct arm64_ftr_bits ftr_id_mmfr0
[] = {
153 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 28, 4, 0xf), /* InnerShr */
154 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 24, 4, 0), /* FCSE */
155 ARM64_FTR_BITS(FTR_NONSTRICT
, FTR_LOWER_SAFE
, 20, 4, 0), /* AuxReg */
156 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 16, 4, 0), /* TCM */
157 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 12, 4, 0), /* ShareLvl */
158 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 8, 4, 0xf), /* OuterShr */
159 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 4, 4, 0), /* PMSA */
160 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 4, 0), /* VMSA */
164 static struct arm64_ftr_bits ftr_id_aa64dfr0
[] = {
165 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 32, 32, 0),
166 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64DFR0_CTX_CMPS_SHIFT
, 4, 0),
167 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64DFR0_WRPS_SHIFT
, 4, 0),
168 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, ID_AA64DFR0_BRPS_SHIFT
, 4, 0),
169 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64DFR0_PMUVER_SHIFT
, 4, 0),
170 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64DFR0_TRACEVER_SHIFT
, 4, 0),
171 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_AA64DFR0_DEBUGVER_SHIFT
, 4, 0x6),
175 static struct arm64_ftr_bits ftr_mvfr2
[] = {
176 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 8, 24, 0), /* RAZ */
177 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 4, 4, 0), /* FPMisc */
178 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 4, 0), /* SIMDMisc */
182 static struct arm64_ftr_bits ftr_dczid
[] = {
183 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 5, 27, 0), /* RAZ */
184 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 4, 1, 1), /* DZP */
185 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 0, 4, 0), /* BS */
190 static struct arm64_ftr_bits ftr_id_isar5
[] = {
191 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_ISAR5_RDM_SHIFT
, 4, 0),
192 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 20, 4, 0), /* RAZ */
193 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_ISAR5_CRC32_SHIFT
, 4, 0),
194 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_ISAR5_SHA2_SHIFT
, 4, 0),
195 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_ISAR5_SHA1_SHIFT
, 4, 0),
196 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_ISAR5_AES_SHIFT
, 4, 0),
197 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, ID_ISAR5_SEVL_SHIFT
, 4, 0),
201 static struct arm64_ftr_bits ftr_id_mmfr4
[] = {
202 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 8, 24, 0), /* RAZ */
203 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 4, 4, 0), /* ac2 */
204 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 4, 0), /* RAZ */
208 static struct arm64_ftr_bits ftr_id_pfr0
[] = {
209 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 16, 16, 0), /* RAZ */
210 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 12, 4, 0), /* State3 */
211 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 8, 4, 0), /* State2 */
212 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 4, 4, 0), /* State1 */
213 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 4, 0), /* State0 */
217 static struct arm64_ftr_bits ftr_id_dfr0
[] = {
218 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 28, 4, 0),
219 S_ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 24, 4, 0xf), /* PerfMon */
220 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 20, 4, 0),
221 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 16, 4, 0),
222 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 12, 4, 0),
223 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 8, 4, 0),
224 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 4, 4, 0),
225 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 0, 4, 0),
230 * Common ftr bits for a 32bit register with all hidden, strict
231 * attributes, with 4bit feature fields and a default safe value of
232 * 0. Covers the following 32bit registers:
233 * id_isar[0-4], id_mmfr[1-3], id_pfr1, mvfr[0-1]
235 static struct arm64_ftr_bits ftr_generic_32bits
[] = {
236 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 28, 4, 0),
237 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 24, 4, 0),
238 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 20, 4, 0),
239 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 16, 4, 0),
240 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 12, 4, 0),
241 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 8, 4, 0),
242 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 4, 4, 0),
243 ARM64_FTR_BITS(FTR_STRICT
, FTR_LOWER_SAFE
, 0, 4, 0),
247 static struct arm64_ftr_bits ftr_generic
[] = {
248 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 64, 0),
252 static struct arm64_ftr_bits ftr_generic32
[] = {
253 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 32, 0),
257 static struct arm64_ftr_bits ftr_aa64raz
[] = {
258 ARM64_FTR_BITS(FTR_STRICT
, FTR_EXACT
, 0, 64, 0),
262 #define ARM64_FTR_REG(id, table) \
266 .ftr_bits = &((table)[0]), \
269 static struct arm64_ftr_reg arm64_ftr_regs
[] = {
271 /* Op1 = 0, CRn = 0, CRm = 1 */
272 ARM64_FTR_REG(SYS_ID_PFR0_EL1
, ftr_id_pfr0
),
273 ARM64_FTR_REG(SYS_ID_PFR1_EL1
, ftr_generic_32bits
),
274 ARM64_FTR_REG(SYS_ID_DFR0_EL1
, ftr_id_dfr0
),
275 ARM64_FTR_REG(SYS_ID_MMFR0_EL1
, ftr_id_mmfr0
),
276 ARM64_FTR_REG(SYS_ID_MMFR1_EL1
, ftr_generic_32bits
),
277 ARM64_FTR_REG(SYS_ID_MMFR2_EL1
, ftr_generic_32bits
),
278 ARM64_FTR_REG(SYS_ID_MMFR3_EL1
, ftr_generic_32bits
),
280 /* Op1 = 0, CRn = 0, CRm = 2 */
281 ARM64_FTR_REG(SYS_ID_ISAR0_EL1
, ftr_generic_32bits
),
282 ARM64_FTR_REG(SYS_ID_ISAR1_EL1
, ftr_generic_32bits
),
283 ARM64_FTR_REG(SYS_ID_ISAR2_EL1
, ftr_generic_32bits
),
284 ARM64_FTR_REG(SYS_ID_ISAR3_EL1
, ftr_generic_32bits
),
285 ARM64_FTR_REG(SYS_ID_ISAR4_EL1
, ftr_generic_32bits
),
286 ARM64_FTR_REG(SYS_ID_ISAR5_EL1
, ftr_id_isar5
),
287 ARM64_FTR_REG(SYS_ID_MMFR4_EL1
, ftr_id_mmfr4
),
289 /* Op1 = 0, CRn = 0, CRm = 3 */
290 ARM64_FTR_REG(SYS_MVFR0_EL1
, ftr_generic_32bits
),
291 ARM64_FTR_REG(SYS_MVFR1_EL1
, ftr_generic_32bits
),
292 ARM64_FTR_REG(SYS_MVFR2_EL1
, ftr_mvfr2
),
294 /* Op1 = 0, CRn = 0, CRm = 4 */
295 ARM64_FTR_REG(SYS_ID_AA64PFR0_EL1
, ftr_id_aa64pfr0
),
296 ARM64_FTR_REG(SYS_ID_AA64PFR1_EL1
, ftr_aa64raz
),
298 /* Op1 = 0, CRn = 0, CRm = 5 */
299 ARM64_FTR_REG(SYS_ID_AA64DFR0_EL1
, ftr_id_aa64dfr0
),
300 ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1
, ftr_generic
),
302 /* Op1 = 0, CRn = 0, CRm = 6 */
303 ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1
, ftr_id_aa64isar0
),
304 ARM64_FTR_REG(SYS_ID_AA64ISAR1_EL1
, ftr_aa64raz
),
306 /* Op1 = 0, CRn = 0, CRm = 7 */
307 ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1
, ftr_id_aa64mmfr0
),
308 ARM64_FTR_REG(SYS_ID_AA64MMFR1_EL1
, ftr_id_aa64mmfr1
),
309 ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1
, ftr_id_aa64mmfr2
),
311 /* Op1 = 3, CRn = 0, CRm = 0 */
312 ARM64_FTR_REG(SYS_CTR_EL0
, ftr_ctr
),
313 ARM64_FTR_REG(SYS_DCZID_EL0
, ftr_dczid
),
315 /* Op1 = 3, CRn = 14, CRm = 0 */
316 ARM64_FTR_REG(SYS_CNTFRQ_EL0
, ftr_generic32
),
319 static int search_cmp_ftr_reg(const void *id
, const void *regp
)
321 return (int)(unsigned long)id
- (int)((const struct arm64_ftr_reg
*)regp
)->sys_id
;
325 * get_arm64_ftr_reg - Lookup a feature register entry using its
326 * sys_reg() encoding. With the array arm64_ftr_regs sorted in the
327 * ascending order of sys_id , we use binary search to find a matching
330 * returns - Upon success, matching ftr_reg entry for id.
331 * - NULL on failure. It is upto the caller to decide
332 * the impact of a failure.
334 static struct arm64_ftr_reg
*get_arm64_ftr_reg(u32 sys_id
)
336 return bsearch((const void *)(unsigned long)sys_id
,
338 ARRAY_SIZE(arm64_ftr_regs
),
339 sizeof(arm64_ftr_regs
[0]),
343 static u64
arm64_ftr_set_value(struct arm64_ftr_bits
*ftrp
, s64 reg
, s64 ftr_val
)
345 u64 mask
= arm64_ftr_mask(ftrp
);
348 reg
|= (ftr_val
<< ftrp
->shift
) & mask
;
352 static s64
arm64_ftr_safe_value(struct arm64_ftr_bits
*ftrp
, s64
new, s64 cur
)
356 switch (ftrp
->type
) {
358 ret
= ftrp
->safe_val
;
361 ret
= new < cur
? new : cur
;
363 case FTR_HIGHER_SAFE
:
364 ret
= new > cur
? new : cur
;
373 static int __init
sort_cmp_ftr_regs(const void *a
, const void *b
)
375 return ((const struct arm64_ftr_reg
*)a
)->sys_id
-
376 ((const struct arm64_ftr_reg
*)b
)->sys_id
;
379 static void __init
swap_ftr_regs(void *a
, void *b
, int size
)
381 struct arm64_ftr_reg tmp
= *(struct arm64_ftr_reg
*)a
;
382 *(struct arm64_ftr_reg
*)a
= *(struct arm64_ftr_reg
*)b
;
383 *(struct arm64_ftr_reg
*)b
= tmp
;
386 static void __init
sort_ftr_regs(void)
388 /* Keep the array sorted so that we can do the binary search */
390 ARRAY_SIZE(arm64_ftr_regs
),
391 sizeof(arm64_ftr_regs
[0]),
397 * Initialise the CPU feature register from Boot CPU values.
398 * Also initiliases the strict_mask for the register.
400 static void __init
init_cpu_ftr_reg(u32 sys_reg
, u64
new)
403 u64 strict_mask
= ~0x0ULL
;
404 struct arm64_ftr_bits
*ftrp
;
405 struct arm64_ftr_reg
*reg
= get_arm64_ftr_reg(sys_reg
);
409 for (ftrp
= reg
->ftr_bits
; ftrp
->width
; ftrp
++) {
410 s64 ftr_new
= arm64_ftr_value(ftrp
, new);
412 val
= arm64_ftr_set_value(ftrp
, val
, ftr_new
);
414 strict_mask
&= ~arm64_ftr_mask(ftrp
);
417 reg
->strict_mask
= strict_mask
;
420 void __init
init_cpu_features(struct cpuinfo_arm64
*info
)
422 /* Before we start using the tables, make sure it is sorted */
425 init_cpu_ftr_reg(SYS_CTR_EL0
, info
->reg_ctr
);
426 init_cpu_ftr_reg(SYS_DCZID_EL0
, info
->reg_dczid
);
427 init_cpu_ftr_reg(SYS_CNTFRQ_EL0
, info
->reg_cntfrq
);
428 init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1
, info
->reg_id_aa64dfr0
);
429 init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1
, info
->reg_id_aa64dfr1
);
430 init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1
, info
->reg_id_aa64isar0
);
431 init_cpu_ftr_reg(SYS_ID_AA64ISAR1_EL1
, info
->reg_id_aa64isar1
);
432 init_cpu_ftr_reg(SYS_ID_AA64MMFR0_EL1
, info
->reg_id_aa64mmfr0
);
433 init_cpu_ftr_reg(SYS_ID_AA64MMFR1_EL1
, info
->reg_id_aa64mmfr1
);
434 init_cpu_ftr_reg(SYS_ID_AA64MMFR2_EL1
, info
->reg_id_aa64mmfr2
);
435 init_cpu_ftr_reg(SYS_ID_AA64PFR0_EL1
, info
->reg_id_aa64pfr0
);
436 init_cpu_ftr_reg(SYS_ID_AA64PFR1_EL1
, info
->reg_id_aa64pfr1
);
437 init_cpu_ftr_reg(SYS_ID_DFR0_EL1
, info
->reg_id_dfr0
);
438 init_cpu_ftr_reg(SYS_ID_ISAR0_EL1
, info
->reg_id_isar0
);
439 init_cpu_ftr_reg(SYS_ID_ISAR1_EL1
, info
->reg_id_isar1
);
440 init_cpu_ftr_reg(SYS_ID_ISAR2_EL1
, info
->reg_id_isar2
);
441 init_cpu_ftr_reg(SYS_ID_ISAR3_EL1
, info
->reg_id_isar3
);
442 init_cpu_ftr_reg(SYS_ID_ISAR4_EL1
, info
->reg_id_isar4
);
443 init_cpu_ftr_reg(SYS_ID_ISAR5_EL1
, info
->reg_id_isar5
);
444 init_cpu_ftr_reg(SYS_ID_MMFR0_EL1
, info
->reg_id_mmfr0
);
445 init_cpu_ftr_reg(SYS_ID_MMFR1_EL1
, info
->reg_id_mmfr1
);
446 init_cpu_ftr_reg(SYS_ID_MMFR2_EL1
, info
->reg_id_mmfr2
);
447 init_cpu_ftr_reg(SYS_ID_MMFR3_EL1
, info
->reg_id_mmfr3
);
448 init_cpu_ftr_reg(SYS_ID_PFR0_EL1
, info
->reg_id_pfr0
);
449 init_cpu_ftr_reg(SYS_ID_PFR1_EL1
, info
->reg_id_pfr1
);
450 init_cpu_ftr_reg(SYS_MVFR0_EL1
, info
->reg_mvfr0
);
451 init_cpu_ftr_reg(SYS_MVFR1_EL1
, info
->reg_mvfr1
);
452 init_cpu_ftr_reg(SYS_MVFR2_EL1
, info
->reg_mvfr2
);
455 static void update_cpu_ftr_reg(struct arm64_ftr_reg
*reg
, u64
new)
457 struct arm64_ftr_bits
*ftrp
;
459 for (ftrp
= reg
->ftr_bits
; ftrp
->width
; ftrp
++) {
460 s64 ftr_cur
= arm64_ftr_value(ftrp
, reg
->sys_val
);
461 s64 ftr_new
= arm64_ftr_value(ftrp
, new);
463 if (ftr_cur
== ftr_new
)
465 /* Find a safe value */
466 ftr_new
= arm64_ftr_safe_value(ftrp
, ftr_new
, ftr_cur
);
467 reg
->sys_val
= arm64_ftr_set_value(ftrp
, reg
->sys_val
, ftr_new
);
472 static int check_update_ftr_reg(u32 sys_id
, int cpu
, u64 val
, u64 boot
)
474 struct arm64_ftr_reg
*regp
= get_arm64_ftr_reg(sys_id
);
477 update_cpu_ftr_reg(regp
, val
);
478 if ((boot
& regp
->strict_mask
) == (val
& regp
->strict_mask
))
480 pr_warn("SANITY CHECK: Unexpected variation in %s. Boot CPU: %#016llx, CPU%d: %#016llx\n",
481 regp
->name
, boot
, cpu
, val
);
486 * Update system wide CPU feature registers with the values from a
487 * non-boot CPU. Also performs SANITY checks to make sure that there
488 * aren't any insane variations from that of the boot CPU.
490 void update_cpu_features(int cpu
,
491 struct cpuinfo_arm64
*info
,
492 struct cpuinfo_arm64
*boot
)
497 * The kernel can handle differing I-cache policies, but otherwise
498 * caches should look identical. Userspace JITs will make use of
501 taint
|= check_update_ftr_reg(SYS_CTR_EL0
, cpu
,
502 info
->reg_ctr
, boot
->reg_ctr
);
505 * Userspace may perform DC ZVA instructions. Mismatched block sizes
506 * could result in too much or too little memory being zeroed if a
507 * process is preempted and migrated between CPUs.
509 taint
|= check_update_ftr_reg(SYS_DCZID_EL0
, cpu
,
510 info
->reg_dczid
, boot
->reg_dczid
);
512 /* If different, timekeeping will be broken (especially with KVM) */
513 taint
|= check_update_ftr_reg(SYS_CNTFRQ_EL0
, cpu
,
514 info
->reg_cntfrq
, boot
->reg_cntfrq
);
517 * The kernel uses self-hosted debug features and expects CPUs to
518 * support identical debug features. We presently need CTX_CMPs, WRPs,
519 * and BRPs to be identical.
520 * ID_AA64DFR1 is currently RES0.
522 taint
|= check_update_ftr_reg(SYS_ID_AA64DFR0_EL1
, cpu
,
523 info
->reg_id_aa64dfr0
, boot
->reg_id_aa64dfr0
);
524 taint
|= check_update_ftr_reg(SYS_ID_AA64DFR1_EL1
, cpu
,
525 info
->reg_id_aa64dfr1
, boot
->reg_id_aa64dfr1
);
527 * Even in big.LITTLE, processors should be identical instruction-set
530 taint
|= check_update_ftr_reg(SYS_ID_AA64ISAR0_EL1
, cpu
,
531 info
->reg_id_aa64isar0
, boot
->reg_id_aa64isar0
);
532 taint
|= check_update_ftr_reg(SYS_ID_AA64ISAR1_EL1
, cpu
,
533 info
->reg_id_aa64isar1
, boot
->reg_id_aa64isar1
);
536 * Differing PARange support is fine as long as all peripherals and
537 * memory are mapped within the minimum PARange of all CPUs.
538 * Linux should not care about secure memory.
540 taint
|= check_update_ftr_reg(SYS_ID_AA64MMFR0_EL1
, cpu
,
541 info
->reg_id_aa64mmfr0
, boot
->reg_id_aa64mmfr0
);
542 taint
|= check_update_ftr_reg(SYS_ID_AA64MMFR1_EL1
, cpu
,
543 info
->reg_id_aa64mmfr1
, boot
->reg_id_aa64mmfr1
);
544 taint
|= check_update_ftr_reg(SYS_ID_AA64MMFR2_EL1
, cpu
,
545 info
->reg_id_aa64mmfr2
, boot
->reg_id_aa64mmfr2
);
548 * EL3 is not our concern.
549 * ID_AA64PFR1 is currently RES0.
551 taint
|= check_update_ftr_reg(SYS_ID_AA64PFR0_EL1
, cpu
,
552 info
->reg_id_aa64pfr0
, boot
->reg_id_aa64pfr0
);
553 taint
|= check_update_ftr_reg(SYS_ID_AA64PFR1_EL1
, cpu
,
554 info
->reg_id_aa64pfr1
, boot
->reg_id_aa64pfr1
);
557 * If we have AArch32, we care about 32-bit features for compat. These
558 * registers should be RES0 otherwise.
560 taint
|= check_update_ftr_reg(SYS_ID_DFR0_EL1
, cpu
,
561 info
->reg_id_dfr0
, boot
->reg_id_dfr0
);
562 taint
|= check_update_ftr_reg(SYS_ID_ISAR0_EL1
, cpu
,
563 info
->reg_id_isar0
, boot
->reg_id_isar0
);
564 taint
|= check_update_ftr_reg(SYS_ID_ISAR1_EL1
, cpu
,
565 info
->reg_id_isar1
, boot
->reg_id_isar1
);
566 taint
|= check_update_ftr_reg(SYS_ID_ISAR2_EL1
, cpu
,
567 info
->reg_id_isar2
, boot
->reg_id_isar2
);
568 taint
|= check_update_ftr_reg(SYS_ID_ISAR3_EL1
, cpu
,
569 info
->reg_id_isar3
, boot
->reg_id_isar3
);
570 taint
|= check_update_ftr_reg(SYS_ID_ISAR4_EL1
, cpu
,
571 info
->reg_id_isar4
, boot
->reg_id_isar4
);
572 taint
|= check_update_ftr_reg(SYS_ID_ISAR5_EL1
, cpu
,
573 info
->reg_id_isar5
, boot
->reg_id_isar5
);
576 * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and
577 * ACTLR formats could differ across CPUs and therefore would have to
578 * be trapped for virtualization anyway.
580 taint
|= check_update_ftr_reg(SYS_ID_MMFR0_EL1
, cpu
,
581 info
->reg_id_mmfr0
, boot
->reg_id_mmfr0
);
582 taint
|= check_update_ftr_reg(SYS_ID_MMFR1_EL1
, cpu
,
583 info
->reg_id_mmfr1
, boot
->reg_id_mmfr1
);
584 taint
|= check_update_ftr_reg(SYS_ID_MMFR2_EL1
, cpu
,
585 info
->reg_id_mmfr2
, boot
->reg_id_mmfr2
);
586 taint
|= check_update_ftr_reg(SYS_ID_MMFR3_EL1
, cpu
,
587 info
->reg_id_mmfr3
, boot
->reg_id_mmfr3
);
588 taint
|= check_update_ftr_reg(SYS_ID_PFR0_EL1
, cpu
,
589 info
->reg_id_pfr0
, boot
->reg_id_pfr0
);
590 taint
|= check_update_ftr_reg(SYS_ID_PFR1_EL1
, cpu
,
591 info
->reg_id_pfr1
, boot
->reg_id_pfr1
);
592 taint
|= check_update_ftr_reg(SYS_MVFR0_EL1
, cpu
,
593 info
->reg_mvfr0
, boot
->reg_mvfr0
);
594 taint
|= check_update_ftr_reg(SYS_MVFR1_EL1
, cpu
,
595 info
->reg_mvfr1
, boot
->reg_mvfr1
);
596 taint
|= check_update_ftr_reg(SYS_MVFR2_EL1
, cpu
,
597 info
->reg_mvfr2
, boot
->reg_mvfr2
);
600 * Mismatched CPU features are a recipe for disaster. Don't even
601 * pretend to support them.
603 WARN_TAINT_ONCE(taint
, TAINT_CPU_OUT_OF_SPEC
,
604 "Unsupported CPU feature variation.\n");
607 u64
read_system_reg(u32 id
)
609 struct arm64_ftr_reg
*regp
= get_arm64_ftr_reg(id
);
611 /* We shouldn't get a request for an unsupported register */
613 return regp
->sys_val
;
616 #include <linux/irqchip/arm-gic-v3.h>
619 feature_matches(u64 reg
, const struct arm64_cpu_capabilities
*entry
)
621 int val
= cpuid_feature_extract_field(reg
, entry
->field_pos
, entry
->sign
);
623 return val
>= entry
->min_field_value
;
627 has_cpuid_feature(const struct arm64_cpu_capabilities
*entry
)
631 val
= read_system_reg(entry
->sys_reg
);
632 return feature_matches(val
, entry
);
635 static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities
*entry
)
639 if (!has_cpuid_feature(entry
))
642 has_sre
= gic_enable_sre();
644 pr_warn_once("%s present but disabled by higher exception level\n",
650 static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities
*entry
)
652 u32 midr
= read_cpuid_id();
655 /* Cavium ThunderX pass 1.x and 2.x */
657 rv_max
= (1 << MIDR_VARIANT_SHIFT
) | MIDR_REVISION_MASK
;
659 return MIDR_IS_CPU_MODEL_RANGE(midr
, MIDR_THUNDERX
, rv_min
, rv_max
);
662 static const struct arm64_cpu_capabilities arm64_features
[] = {
664 .desc
= "GIC system register CPU interface",
665 .capability
= ARM64_HAS_SYSREG_GIC_CPUIF
,
666 .matches
= has_useable_gicv3_cpuif
,
667 .sys_reg
= SYS_ID_AA64PFR0_EL1
,
668 .field_pos
= ID_AA64PFR0_GIC_SHIFT
,
669 .sign
= FTR_UNSIGNED
,
670 .min_field_value
= 1,
672 #ifdef CONFIG_ARM64_PAN
674 .desc
= "Privileged Access Never",
675 .capability
= ARM64_HAS_PAN
,
676 .matches
= has_cpuid_feature
,
677 .sys_reg
= SYS_ID_AA64MMFR1_EL1
,
678 .field_pos
= ID_AA64MMFR1_PAN_SHIFT
,
679 .sign
= FTR_UNSIGNED
,
680 .min_field_value
= 1,
681 .enable
= cpu_enable_pan
,
683 #endif /* CONFIG_ARM64_PAN */
684 #if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
686 .desc
= "LSE atomic instructions",
687 .capability
= ARM64_HAS_LSE_ATOMICS
,
688 .matches
= has_cpuid_feature
,
689 .sys_reg
= SYS_ID_AA64ISAR0_EL1
,
690 .field_pos
= ID_AA64ISAR0_ATOMICS_SHIFT
,
691 .sign
= FTR_UNSIGNED
,
692 .min_field_value
= 2,
694 #endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
696 .desc
= "Software prefetching using PRFM",
697 .capability
= ARM64_HAS_NO_HW_PREFETCH
,
698 .matches
= has_no_hw_prefetch
,
700 #ifdef CONFIG_ARM64_UAO
702 .desc
= "User Access Override",
703 .capability
= ARM64_HAS_UAO
,
704 .matches
= has_cpuid_feature
,
705 .sys_reg
= SYS_ID_AA64MMFR2_EL1
,
706 .field_pos
= ID_AA64MMFR2_UAO_SHIFT
,
707 .min_field_value
= 1,
708 .enable
= cpu_enable_uao
,
710 #endif /* CONFIG_ARM64_UAO */
711 #ifdef CONFIG_ARM64_PAN
713 .capability
= ARM64_ALT_PAN_NOT_UAO
,
714 .matches
= cpufeature_pan_not_uao
,
716 #endif /* CONFIG_ARM64_PAN */
720 #define HWCAP_CAP(reg, field, s, min_value, type, cap) \
723 .matches = has_cpuid_feature, \
725 .field_pos = field, \
727 .min_field_value = min_value, \
728 .hwcap_type = type, \
732 static const struct arm64_cpu_capabilities arm64_hwcaps
[] = {
733 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1
, ID_AA64ISAR0_AES_SHIFT
, FTR_UNSIGNED
, 2, CAP_HWCAP
, HWCAP_PMULL
),
734 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1
, ID_AA64ISAR0_AES_SHIFT
, FTR_UNSIGNED
, 1, CAP_HWCAP
, HWCAP_AES
),
735 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1
, ID_AA64ISAR0_SHA1_SHIFT
, FTR_UNSIGNED
, 1, CAP_HWCAP
, HWCAP_SHA1
),
736 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1
, ID_AA64ISAR0_SHA2_SHIFT
, FTR_UNSIGNED
, 1, CAP_HWCAP
, HWCAP_SHA2
),
737 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1
, ID_AA64ISAR0_CRC32_SHIFT
, FTR_UNSIGNED
, 1, CAP_HWCAP
, HWCAP_CRC32
),
738 HWCAP_CAP(SYS_ID_AA64ISAR0_EL1
, ID_AA64ISAR0_ATOMICS_SHIFT
, FTR_UNSIGNED
, 2, CAP_HWCAP
, HWCAP_ATOMICS
),
739 HWCAP_CAP(SYS_ID_AA64PFR0_EL1
, ID_AA64PFR0_FP_SHIFT
, FTR_SIGNED
, 0, CAP_HWCAP
, HWCAP_FP
),
740 HWCAP_CAP(SYS_ID_AA64PFR0_EL1
, ID_AA64PFR0_FP_SHIFT
, FTR_SIGNED
, 1, CAP_HWCAP
, HWCAP_FPHP
),
741 HWCAP_CAP(SYS_ID_AA64PFR0_EL1
, ID_AA64PFR0_ASIMD_SHIFT
, FTR_SIGNED
, 0, CAP_HWCAP
, HWCAP_ASIMD
),
742 HWCAP_CAP(SYS_ID_AA64PFR0_EL1
, ID_AA64PFR0_ASIMD_SHIFT
, FTR_SIGNED
, 1, CAP_HWCAP
, HWCAP_ASIMDHP
),
744 HWCAP_CAP(SYS_ID_ISAR5_EL1
, ID_ISAR5_AES_SHIFT
, FTR_UNSIGNED
, 2, CAP_COMPAT_HWCAP2
, COMPAT_HWCAP2_PMULL
),
745 HWCAP_CAP(SYS_ID_ISAR5_EL1
, ID_ISAR5_AES_SHIFT
, FTR_UNSIGNED
, 1, CAP_COMPAT_HWCAP2
, COMPAT_HWCAP2_AES
),
746 HWCAP_CAP(SYS_ID_ISAR5_EL1
, ID_ISAR5_SHA1_SHIFT
, FTR_UNSIGNED
, 1, CAP_COMPAT_HWCAP2
, COMPAT_HWCAP2_SHA1
),
747 HWCAP_CAP(SYS_ID_ISAR5_EL1
, ID_ISAR5_SHA2_SHIFT
, FTR_UNSIGNED
, 1, CAP_COMPAT_HWCAP2
, COMPAT_HWCAP2_SHA2
),
748 HWCAP_CAP(SYS_ID_ISAR5_EL1
, ID_ISAR5_CRC32_SHIFT
, FTR_UNSIGNED
, 1, CAP_COMPAT_HWCAP2
, COMPAT_HWCAP2_CRC32
),
753 static void __init
cap_set_hwcap(const struct arm64_cpu_capabilities
*cap
)
755 switch (cap
->hwcap_type
) {
757 elf_hwcap
|= cap
->hwcap
;
760 case CAP_COMPAT_HWCAP
:
761 compat_elf_hwcap
|= (u32
)cap
->hwcap
;
763 case CAP_COMPAT_HWCAP2
:
764 compat_elf_hwcap2
|= (u32
)cap
->hwcap
;
773 /* Check if we have a particular HWCAP enabled */
774 static bool __maybe_unused
cpus_have_hwcap(const struct arm64_cpu_capabilities
*cap
)
778 switch (cap
->hwcap_type
) {
780 rc
= (elf_hwcap
& cap
->hwcap
) != 0;
783 case CAP_COMPAT_HWCAP
:
784 rc
= (compat_elf_hwcap
& (u32
)cap
->hwcap
) != 0;
786 case CAP_COMPAT_HWCAP2
:
787 rc
= (compat_elf_hwcap2
& (u32
)cap
->hwcap
) != 0;
798 static void __init
setup_cpu_hwcaps(void)
801 const struct arm64_cpu_capabilities
*hwcaps
= arm64_hwcaps
;
803 for (i
= 0; hwcaps
[i
].matches
; i
++)
804 if (hwcaps
[i
].matches(&hwcaps
[i
]))
805 cap_set_hwcap(&hwcaps
[i
]);
808 void update_cpu_capabilities(const struct arm64_cpu_capabilities
*caps
,
813 for (i
= 0; caps
[i
].matches
; i
++) {
814 if (!caps
[i
].matches(&caps
[i
]))
817 if (!cpus_have_cap(caps
[i
].capability
) && caps
[i
].desc
)
818 pr_info("%s %s\n", info
, caps
[i
].desc
);
819 cpus_set_cap(caps
[i
].capability
);
824 * Run through the enabled capabilities and enable() it on all active
828 enable_cpu_capabilities(const struct arm64_cpu_capabilities
*caps
)
832 for (i
= 0; caps
[i
].matches
; i
++)
833 if (caps
[i
].enable
&& cpus_have_cap(caps
[i
].capability
))
834 on_each_cpu(caps
[i
].enable
, NULL
, true);
838 * Flag to indicate if we have computed the system wide
839 * capabilities based on the boot time active CPUs. This
840 * will be used to determine if a new booting CPU should
841 * go through the verification process to make sure that it
842 * supports the system capabilities, without using a hotplug
845 static bool sys_caps_initialised
;
847 static inline void set_sys_caps_initialised(void)
849 sys_caps_initialised
= true;
853 * __raw_read_system_reg() - Used by a STARTING cpu before cpuinfo is populated.
855 static u64
__raw_read_system_reg(u32 sys_id
)
858 case SYS_ID_PFR0_EL1
: return read_cpuid(SYS_ID_PFR0_EL1
);
859 case SYS_ID_PFR1_EL1
: return read_cpuid(SYS_ID_PFR1_EL1
);
860 case SYS_ID_DFR0_EL1
: return read_cpuid(SYS_ID_DFR0_EL1
);
861 case SYS_ID_MMFR0_EL1
: return read_cpuid(SYS_ID_MMFR0_EL1
);
862 case SYS_ID_MMFR1_EL1
: return read_cpuid(SYS_ID_MMFR1_EL1
);
863 case SYS_ID_MMFR2_EL1
: return read_cpuid(SYS_ID_MMFR2_EL1
);
864 case SYS_ID_MMFR3_EL1
: return read_cpuid(SYS_ID_MMFR3_EL1
);
865 case SYS_ID_ISAR0_EL1
: return read_cpuid(SYS_ID_ISAR0_EL1
);
866 case SYS_ID_ISAR1_EL1
: return read_cpuid(SYS_ID_ISAR1_EL1
);
867 case SYS_ID_ISAR2_EL1
: return read_cpuid(SYS_ID_ISAR2_EL1
);
868 case SYS_ID_ISAR3_EL1
: return read_cpuid(SYS_ID_ISAR3_EL1
);
869 case SYS_ID_ISAR4_EL1
: return read_cpuid(SYS_ID_ISAR4_EL1
);
870 case SYS_ID_ISAR5_EL1
: return read_cpuid(SYS_ID_ISAR4_EL1
);
871 case SYS_MVFR0_EL1
: return read_cpuid(SYS_MVFR0_EL1
);
872 case SYS_MVFR1_EL1
: return read_cpuid(SYS_MVFR1_EL1
);
873 case SYS_MVFR2_EL1
: return read_cpuid(SYS_MVFR2_EL1
);
875 case SYS_ID_AA64PFR0_EL1
: return read_cpuid(SYS_ID_AA64PFR0_EL1
);
876 case SYS_ID_AA64PFR1_EL1
: return read_cpuid(SYS_ID_AA64PFR0_EL1
);
877 case SYS_ID_AA64DFR0_EL1
: return read_cpuid(SYS_ID_AA64DFR0_EL1
);
878 case SYS_ID_AA64DFR1_EL1
: return read_cpuid(SYS_ID_AA64DFR0_EL1
);
879 case SYS_ID_AA64MMFR0_EL1
: return read_cpuid(SYS_ID_AA64MMFR0_EL1
);
880 case SYS_ID_AA64MMFR1_EL1
: return read_cpuid(SYS_ID_AA64MMFR1_EL1
);
881 case SYS_ID_AA64MMFR2_EL1
: return read_cpuid(SYS_ID_AA64MMFR2_EL1
);
882 case SYS_ID_AA64ISAR0_EL1
: return read_cpuid(SYS_ID_AA64ISAR0_EL1
);
883 case SYS_ID_AA64ISAR1_EL1
: return read_cpuid(SYS_ID_AA64ISAR1_EL1
);
885 case SYS_CNTFRQ_EL0
: return read_cpuid(SYS_CNTFRQ_EL0
);
886 case SYS_CTR_EL0
: return read_cpuid(SYS_CTR_EL0
);
887 case SYS_DCZID_EL0
: return read_cpuid(SYS_DCZID_EL0
);
895 * Check for CPU features that are used in early boot
896 * based on the Boot CPU value.
898 static void check_early_cpu_features(void)
900 verify_cpu_asid_bits();
904 * Run through the enabled system capabilities and enable() it on this CPU.
905 * The capabilities were decided based on the available CPUs at the boot time.
906 * Any new CPU should match the system wide status of the capability. If the
907 * new CPU doesn't have a capability which the system now has enabled, we
908 * cannot do anything to fix it up and could cause unexpected failures. So
911 void verify_local_cpu_capabilities(void)
914 const struct arm64_cpu_capabilities
*caps
;
916 check_early_cpu_features();
919 * If we haven't computed the system capabilities, there is nothing
922 if (!sys_caps_initialised
)
925 caps
= arm64_features
;
926 for (i
= 0; caps
[i
].matches
; i
++) {
927 if (!cpus_have_cap(caps
[i
].capability
) || !caps
[i
].sys_reg
)
930 * If the new CPU misses an advertised feature, we cannot proceed
931 * further, park the cpu.
933 if (!feature_matches(__raw_read_system_reg(caps
[i
].sys_reg
), &caps
[i
])) {
934 pr_crit("CPU%d: missing feature: %s\n",
935 smp_processor_id(), caps
[i
].desc
);
939 caps
[i
].enable(NULL
);
942 for (i
= 0, caps
= arm64_hwcaps
; caps
[i
].matches
; i
++) {
943 if (!cpus_have_hwcap(&caps
[i
]))
945 if (!feature_matches(__raw_read_system_reg(caps
[i
].sys_reg
), &caps
[i
])) {
946 pr_crit("CPU%d: missing HWCAP: %s\n",
947 smp_processor_id(), caps
[i
].desc
);
953 static void __init
setup_feature_capabilities(void)
955 update_cpu_capabilities(arm64_features
, "detected feature:");
956 enable_cpu_capabilities(arm64_features
);
959 void __init
setup_cpu_features(void)
964 /* Set the CPU feature capabilies */
965 setup_feature_capabilities();
968 /* Advertise that we have computed the system capabilities */
969 set_sys_caps_initialised();
972 * Check for sane CTR_EL0.CWG value.
974 cwg
= cache_type_cwg();
975 cls
= cache_line_size();
977 pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n",
979 if (L1_CACHE_BYTES
< cls
)
980 pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n",
981 L1_CACHE_BYTES
, cls
);
984 static bool __maybe_unused
985 cpufeature_pan_not_uao(const struct arm64_cpu_capabilities
*entry
)
987 return (cpus_have_cap(ARM64_HAS_PAN
) && !cpus_have_cap(ARM64_HAS_UAO
));