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359b7064 MZ |
1 | /* |
2 | * Contains CPU feature definitions | |
3 | * | |
4 | * Copyright (C) 2015 ARM Ltd. | |
5 | * | |
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. | |
9 | * | |
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. | |
14 | * | |
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/>. | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) "alternatives: " fmt | |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <asm/cpu.h> | |
23 | #include <asm/cpufeature.h> | |
24 | ||
94a9e04a MZ |
25 | static bool |
26 | has_id_aa64pfr0_feature(const struct arm64_cpu_capabilities *entry) | |
27 | { | |
28 | u64 val; | |
29 | ||
30 | val = read_cpuid(id_aa64pfr0_el1); | |
31 | return (val & entry->register_mask) == entry->register_value; | |
32 | } | |
33 | ||
359b7064 | 34 | static const struct arm64_cpu_capabilities arm64_features[] = { |
94a9e04a MZ |
35 | { |
36 | .desc = "GIC system register CPU interface", | |
37 | .capability = ARM64_HAS_SYSREG_GIC_CPUIF, | |
38 | .matches = has_id_aa64pfr0_feature, | |
39 | .register_mask = (0xf << 24), | |
40 | .register_value = (1 << 24), | |
41 | }, | |
359b7064 MZ |
42 | {}, |
43 | }; | |
44 | ||
45 | void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps, | |
46 | const char *info) | |
47 | { | |
48 | int i; | |
49 | ||
50 | for (i = 0; caps[i].desc; i++) { | |
51 | if (!caps[i].matches(&caps[i])) | |
52 | continue; | |
53 | ||
54 | if (!cpus_have_cap(caps[i].capability)) | |
55 | pr_info("%s %s\n", info, caps[i].desc); | |
56 | cpus_set_cap(caps[i].capability); | |
57 | } | |
58 | } | |
59 | ||
60 | void check_local_cpu_features(void) | |
61 | { | |
62 | check_cpu_capabilities(arm64_features, "detected feature"); | |
63 | } |