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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 | ||
14 | #include <linux/mod_devicetable.h> | |
15 | #include <asm/cpufeature.h> | |
16 | ||
17 | /* | |
18 | * Macros imported from <asm/cpufeature.h>: | |
19 | * - cpu_feature(x) ordinal value of feature called 'x' | |
20 | * - cpu_have_feature(u32 n) whether feature #n is available | |
21 | * - MAX_CPU_FEATURES upper bound for feature ordinal values | |
22 | * Optional: | |
23 | * - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type | |
24 | * - CPU_FEATURE_TYPEVAL set of values matching the format string above | |
25 | */ | |
26 | ||
27 | #ifndef CPU_FEATURE_TYPEFMT | |
28 | #define CPU_FEATURE_TYPEFMT "%s" | |
29 | #endif | |
30 | ||
31 | #ifndef CPU_FEATURE_TYPEVAL | |
32 | #define CPU_FEATURE_TYPEVAL ELF_PLATFORM | |
33 | #endif | |
34 | ||
35 | /* | |
36 | * Use module_cpu_feature_match(feature, module_init_function) to | |
37 | * declare that | |
38 | * a) the module shall be probed upon discovery of CPU feature 'feature' | |
39 | * (typically at boot time using udev) | |
40 | * b) the module must not be loaded if CPU feature 'feature' is not present | |
41 | * (not even by manual insmod). | |
42 | * | |
43 | * For a list of legal values for 'feature', please consult the file | |
44 | * 'asm/cpufeature.h' of your favorite architecture. | |
45 | */ | |
46 | #define module_cpu_feature_match(x, __init) \ | |
47 | static struct cpu_feature const cpu_feature_match_ ## x[] = \ | |
48 | { { .feature = cpu_feature(x) }, { } }; \ | |
49 | MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \ | |
50 | \ | |
51 | static int cpu_feature_match_ ## x ## _init(void) \ | |
52 | { \ | |
53 | if (!cpu_have_feature(cpu_feature(x))) \ | |
54 | return -ENODEV; \ | |
55 | return __init(); \ | |
56 | } \ | |
57 | module_init(cpu_feature_match_ ## x ## _init) | |
58 | ||
59 | #endif | |
60 | #endif |