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Linux/arch/arm64/include/asm/cpufeature.h

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  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 __ASM_CPUFEATURE_H
 10 #define __ASM_CPUFEATURE_H
 11 
 12 #include <asm/hwcap.h>
 13 
 14 /*
 15  * In the arm64 world (as in the ARM world), elf_hwcap is used both internally
 16  * in the kernel and for user space to keep track of which optional features
 17  * are supported by the current system. So let's map feature 'x' to HWCAP_x.
 18  * Note that HWCAP_x constants are bit fields so we need to take the log.
 19  */
 20 
 21 #define MAX_CPU_FEATURES        (8 * sizeof(elf_hwcap))
 22 #define cpu_feature(x)          ilog2(HWCAP_ ## x)
 23 
 24 #define ARM64_WORKAROUND_CLEAN_CACHE            0
 25 #define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE    1
 26 #define ARM64_WORKAROUND_845719                 2
 27 #define ARM64_HAS_SYSREG_GIC_CPUIF              3
 28 #define ARM64_HAS_PAN                           4
 29 #define ARM64_HAS_LSE_ATOMICS                   5
 30 #define ARM64_WORKAROUND_834220                 6
 31 
 32 #define ARM64_NCAPS                             7
 33 
 34 #ifndef __ASSEMBLY__
 35 
 36 #include <linux/kernel.h>
 37 
 38 struct arm64_cpu_capabilities {
 39         const char *desc;
 40         u16 capability;
 41         bool (*matches)(const struct arm64_cpu_capabilities *);
 42         void (*enable)(void);
 43         union {
 44                 struct {        /* To be used for erratum handling only */
 45                         u32 midr_model;
 46                         u32 midr_range_min, midr_range_max;
 47                 };
 48 
 49                 struct {        /* Feature register checking */
 50                         int field_pos;
 51                         int min_field_value;
 52                 };
 53         };
 54 };
 55 
 56 extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
 57 
 58 static inline bool cpu_have_feature(unsigned int num)
 59 {
 60         return elf_hwcap & (1UL << num);
 61 }
 62 
 63 static inline bool cpus_have_cap(unsigned int num)
 64 {
 65         if (num >= ARM64_NCAPS)
 66                 return false;
 67         return test_bit(num, cpu_hwcaps);
 68 }
 69 
 70 static inline void cpus_set_cap(unsigned int num)
 71 {
 72         if (num >= ARM64_NCAPS)
 73                 pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n",
 74                         num, ARM64_NCAPS);
 75         else
 76                 __set_bit(num, cpu_hwcaps);
 77 }
 78 
 79 static inline int __attribute_const__ cpuid_feature_extract_field(u64 features,
 80                                                                   int field)
 81 {
 82         return (s64)(features << (64 - 4 - field)) >> (64 - 4);
 83 }
 84 
 85 
 86 void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
 87                             const char *info);
 88 void check_local_cpu_errata(void);
 89 void check_local_cpu_features(void);
 90 bool cpu_supports_mixed_endian_el0(void);
 91 bool system_supports_mixed_endian_el0(void);
 92 
 93 #endif /* __ASSEMBLY__ */
 94 
 95 #endif
 96 

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