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TOMOYO Linux Cross Reference
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 
 29 #define ARM64_NCAPS                             4
 30 
 31 #ifndef __ASSEMBLY__
 32 
 33 struct arm64_cpu_capabilities {
 34         const char *desc;
 35         u16 capability;
 36         bool (*matches)(const struct arm64_cpu_capabilities *);
 37         union {
 38                 struct {        /* To be used for erratum handling only */
 39                         u32 midr_model;
 40                         u32 midr_range_min, midr_range_max;
 41                 };
 42 
 43                 struct {        /* Feature register checking */
 44                         u64 register_mask;
 45                         u64 register_value;
 46                 };
 47         };
 48 };
 49 
 50 extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
 51 
 52 static inline bool cpu_have_feature(unsigned int num)
 53 {
 54         return elf_hwcap & (1UL << num);
 55 }
 56 
 57 static inline bool cpus_have_cap(unsigned int num)
 58 {
 59         if (num >= ARM64_NCAPS)
 60                 return false;
 61         return test_bit(num, cpu_hwcaps);
 62 }
 63 
 64 static inline void cpus_set_cap(unsigned int num)
 65 {
 66         if (num >= ARM64_NCAPS)
 67                 pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n",
 68                         num, ARM64_NCAPS);
 69         else
 70                 __set_bit(num, cpu_hwcaps);
 71 }
 72 
 73 void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
 74                             const char *info);
 75 void check_local_cpu_errata(void);
 76 void check_local_cpu_features(void);
 77 bool cpu_supports_mixed_endian_el0(void);
 78 bool system_supports_mixed_endian_el0(void);
 79 
 80 #endif /* __ASSEMBLY__ */
 81 
 82 #endif
 83 

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