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Linux/arch/powerpc/include/asm/cpu_has_feature.h

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  1 #ifndef __ASM_POWERPC_CPUFEATURES_H
  2 #define __ASM_POWERPC_CPUFEATURES_H
  3 
  4 #ifndef __ASSEMBLY__
  5 
  6 #include <linux/bug.h>
  7 #include <asm/cputable.h>
  8 
  9 static inline bool early_cpu_has_feature(unsigned long feature)
 10 {
 11         return !!((CPU_FTRS_ALWAYS & feature) ||
 12                   (CPU_FTRS_POSSIBLE & cur_cpu_spec->cpu_features & feature));
 13 }
 14 
 15 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
 16 #include <linux/jump_label.h>
 17 
 18 #define NUM_CPU_FTR_KEYS        BITS_PER_LONG
 19 
 20 extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS];
 21 
 22 static __always_inline bool cpu_has_feature(unsigned long feature)
 23 {
 24         int i;
 25 
 26 #ifndef __clang__ /* clang can't cope with this */
 27         BUILD_BUG_ON(!__builtin_constant_p(feature));
 28 #endif
 29 
 30 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
 31         if (!static_key_initialized) {
 32                 printk("Warning! cpu_has_feature() used prior to jump label init!\n");
 33                 dump_stack();
 34                 return early_cpu_has_feature(feature);
 35         }
 36 #endif
 37 
 38         if (CPU_FTRS_ALWAYS & feature)
 39                 return true;
 40 
 41         if (!(CPU_FTRS_POSSIBLE & feature))
 42                 return false;
 43 
 44         i = __builtin_ctzl(feature);
 45         return static_branch_likely(&cpu_feature_keys[i]);
 46 }
 47 #else
 48 static inline bool cpu_has_feature(unsigned long feature)
 49 {
 50         return early_cpu_has_feature(feature);
 51 }
 52 #endif
 53 
 54 #endif /* __ASSEMBLY__ */
 55 #endif /* __ASM_POWERPC_CPUFEATURE_H */
 56 

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