Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
67bad2fd AB |
2 | /* |
3 | * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> | |
67bad2fd AB |
4 | */ |
5 | ||
6 | #ifndef __LINUX_CPUFEATURE_H | |
7 | #define __LINUX_CPUFEATURE_H | |
8 | ||
9 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE | |
10 | ||
7d0c5020 | 11 | #include <linux/init.h> |
67bad2fd AB |
12 | #include <linux/mod_devicetable.h> |
13 | #include <asm/cpufeature.h> | |
14 | ||
15 | /* | |
16 | * Macros imported from <asm/cpufeature.h>: | |
17 | * - cpu_feature(x) ordinal value of feature called 'x' | |
18 | * - cpu_have_feature(u32 n) whether feature #n is available | |
19 | * - MAX_CPU_FEATURES upper bound for feature ordinal values | |
20 | * Optional: | |
21 | * - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type | |
22 | * - CPU_FEATURE_TYPEVAL set of values matching the format string above | |
23 | */ | |
24 | ||
25 | #ifndef CPU_FEATURE_TYPEFMT | |
26 | #define CPU_FEATURE_TYPEFMT "%s" | |
27 | #endif | |
28 | ||
29 | #ifndef CPU_FEATURE_TYPEVAL | |
30 | #define CPU_FEATURE_TYPEVAL ELF_PLATFORM | |
31 | #endif | |
32 | ||
33 | /* | |
34 | * Use module_cpu_feature_match(feature, module_init_function) to | |
35 | * declare that | |
36 | * a) the module shall be probed upon discovery of CPU feature 'feature' | |
37 | * (typically at boot time using udev) | |
38 | * b) the module must not be loaded if CPU feature 'feature' is not present | |
39 | * (not even by manual insmod). | |
40 | * | |
41 | * For a list of legal values for 'feature', please consult the file | |
42 | * 'asm/cpufeature.h' of your favorite architecture. | |
43 | */ | |
7d0c5020 | 44 | #define module_cpu_feature_match(x, __initfunc) \ |
c785896b | 45 | static struct cpu_feature const __maybe_unused cpu_feature_match_ ## x[] = \ |
67bad2fd AB |
46 | { { .feature = cpu_feature(x) }, { } }; \ |
47 | MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \ | |
48 | \ | |
7d0c5020 | 49 | static int __init cpu_feature_match_ ## x ## _init(void) \ |
67bad2fd AB |
50 | { \ |
51 | if (!cpu_have_feature(cpu_feature(x))) \ | |
52 | return -ENODEV; \ | |
7d0c5020 | 53 | return __initfunc(); \ |
67bad2fd AB |
54 | } \ |
55 | module_init(cpu_feature_match_ ## x ## _init) | |
56 | ||
57 | #endif | |
58 | #endif |