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Linux/arch/arm/include/asm/cpufeature.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
  4  */
  5 
  6 #ifndef __ASM_CPUFEATURE_H
  7 #define __ASM_CPUFEATURE_H
  8 
  9 #include <linux/log2.h>
 10 #include <asm/hwcap.h>
 11 
 12 /*
 13  * Due to the fact that ELF_HWCAP is a 32-bit type on ARM, and given the number
 14  * of optional CPU features it defines, ARM's CPU hardware capability bits have
 15  * been distributed over separate elf_hwcap and elf_hwcap2 variables, each of
 16  * which covers a subset of the available CPU features.
 17  *
 18  * Currently, only a few of those are suitable for automatic module loading
 19  * (which is the primary use case of this facility) and those happen to be all
 20  * covered by HWCAP2. So let's only cover those via the cpu_feature()
 21  * convenience macro for now (which is used by module_cpu_feature_match()).
 22  * However, all capabilities are exposed via the modalias, and can be matched
 23  * using an explicit MODULE_DEVICE_TABLE() that uses __hwcap_feature() directly.
 24  */
 25 #define MAX_CPU_FEATURES        64
 26 #define __hwcap_feature(x)      ilog2(HWCAP_ ## x)
 27 #define __hwcap2_feature(x)     (32 + ilog2(HWCAP2_ ## x))
 28 #define cpu_feature(x)          __hwcap2_feature(x)
 29 
 30 static inline bool cpu_have_feature(unsigned int num)
 31 {
 32         return num < 32 ? elf_hwcap & BIT(num) : elf_hwcap2 & BIT(num - 32);
 33 }
 34 
 35 #endif
 36 

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