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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Copyright (C) 2014 Linaro Ltd. <[email protected]>
- */
- #ifndef __LINUX_CPUFEATURE_H
- #define __LINUX_CPUFEATURE_H
- #ifdef CONFIG_GENERIC_CPU_AUTOPROBE
- #include <linux/init.h>
- #include <linux/mod_devicetable.h>
- #include <asm/cpufeature.h>
- /*
- * Macros imported from <asm/cpufeature.h>:
- * - cpu_feature(x) ordinal value of feature called 'x'
- * - cpu_have_feature(u32 n) whether feature #n is available
- * - MAX_CPU_FEATURES upper bound for feature ordinal values
- * Optional:
- * - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type
- * - CPU_FEATURE_TYPEVAL set of values matching the format string above
- */
- #ifndef CPU_FEATURE_TYPEFMT
- #define CPU_FEATURE_TYPEFMT "%s"
- #endif
- #ifndef CPU_FEATURE_TYPEVAL
- #define CPU_FEATURE_TYPEVAL ELF_PLATFORM
- #endif
- /*
- * Use module_cpu_feature_match(feature, module_init_function) to
- * declare that
- * a) the module shall be probed upon discovery of CPU feature 'feature'
- * (typically at boot time using udev)
- * b) the module must not be loaded if CPU feature 'feature' is not present
- * (not even by manual insmod).
- *
- * For a list of legal values for 'feature', please consult the file
- * 'asm/cpufeature.h' of your favorite architecture.
- */
- #define module_cpu_feature_match(x, __initfunc) \
- static struct cpu_feature const __maybe_unused cpu_feature_match_ ## x[] = \
- { { .feature = cpu_feature(x) }, { } }; \
- MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \
- \
- static int __init cpu_feature_match_ ## x ## _init(void) \
- { \
- if (!cpu_have_feature(cpu_feature(x))) \
- return -ENODEV; \
- return __initfunc(); \
- } \
- module_init(cpu_feature_match_ ## x ## _init)
- #endif
- #endif
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