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67bad2fd AB |
1 | /* |
2 | * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #ifndef __LINUX_CPUFEATURE_H | |
10 | #define __LINUX_CPUFEATURE_H | |
11 | ||
12 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE | |
13 | ||
7d0c5020 | 14 | #include <linux/init.h> |
67bad2fd AB |
15 | #include <linux/mod_devicetable.h> |
16 | #include <asm/cpufeature.h> | |
17 | ||
18 | /* | |
19 | * Macros imported from <asm/cpufeature.h>: | |
20 | * - cpu_feature(x) ordinal value of feature called 'x' | |
21 | * - cpu_have_feature(u32 n) whether feature #n is available | |
22 | * - MAX_CPU_FEATURES upper bound for feature ordinal values | |
23 | * Optional: | |
24 | * - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type | |
25 | * - CPU_FEATURE_TYPEVAL set of values matching the format string above | |
26 | */ | |
27 | ||
28 | #ifndef CPU_FEATURE_TYPEFMT | |
29 | #define CPU_FEATURE_TYPEFMT "%s" | |
30 | #endif | |
31 | ||
32 | #ifndef CPU_FEATURE_TYPEVAL | |
33 | #define CPU_FEATURE_TYPEVAL ELF_PLATFORM | |
34 | #endif | |
35 | ||
36 | /* | |
37 | * Use module_cpu_feature_match(feature, module_init_function) to | |
38 | * declare that | |
39 | * a) the module shall be probed upon discovery of CPU feature 'feature' | |
40 | * (typically at boot time using udev) | |
41 | * b) the module must not be loaded if CPU feature 'feature' is not present | |
42 | * (not even by manual insmod). | |
43 | * | |
44 | * For a list of legal values for 'feature', please consult the file | |
45 | * 'asm/cpufeature.h' of your favorite architecture. | |
46 | */ | |
7d0c5020 | 47 | #define module_cpu_feature_match(x, __initfunc) \ |
67bad2fd AB |
48 | static struct cpu_feature const cpu_feature_match_ ## x[] = \ |
49 | { { .feature = cpu_feature(x) }, { } }; \ | |
50 | MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \ | |
51 | \ | |
7d0c5020 | 52 | static int __init cpu_feature_match_ ## x ## _init(void) \ |
67bad2fd AB |
53 | { \ |
54 | if (!cpu_have_feature(cpu_feature(x))) \ | |
55 | return -ENODEV; \ | |
7d0c5020 | 56 | return __initfunc(); \ |
67bad2fd AB |
57 | } \ |
58 | module_init(cpu_feature_match_ ## x ## _init) | |
59 | ||
60 | #endif | |
61 | #endif |