1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
 
 
 
 
 4 */
 5
 6#ifndef __LINUX_CPUFEATURE_H
 7#define __LINUX_CPUFEATURE_H
 8
 9#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
10
11#include <linux/init.h>
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 */
44#define module_cpu_feature_match(x, __initfunc)			\
45static struct cpu_feature const __maybe_unused cpu_feature_match_ ## x[] = \
46	{ { .feature = cpu_feature(x) }, { } };			\
47MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x);		\
48								\
49static int __init cpu_feature_match_ ## x ## _init(void)	\
50{								\
51	if (!cpu_have_feature(cpu_feature(x)))			\
52		return -ENODEV;					\
53	return __initfunc();					\
54}								\
55module_init(cpu_feature_match_ ## x ## _init)
56
57#endif
58#endif

 
 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/init.h>
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 */
47#define module_cpu_feature_match(x, __initfunc)			\
48static struct cpu_feature const cpu_feature_match_ ## x[] =	\
49	{ { .feature = cpu_feature(x) }, { } };			\
50MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x);		\
51								\
52static int __init cpu_feature_match_ ## x ## _init(void)	\
53{								\
54	if (!cpu_have_feature(cpu_feature(x)))			\
55		return -ENODEV;					\
56	return __initfunc();					\
57}								\
58module_init(cpu_feature_match_ ## x ## _init)
59
60#endif
61#endif