1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_POWERPC_CPU_HAS_FEATURE_H 3 #define __ASM_POWERPC_CPU_HAS_FEATURE_H 4 5 #ifndef __ASSEMBLY__ 6 7 #include <linux/bug.h> 8 #include <asm/cputable.h> 9 10 static __always_inline bool early_cpu_has_feature(unsigned long feature) 11 { 12 return !!((CPU_FTRS_ALWAYS & feature) || 13 (CPU_FTRS_POSSIBLE & cur_cpu_spec->cpu_features & feature)); 14 } 15 16 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS 17 #include <linux/jump_label.h> 18 19 #define NUM_CPU_FTR_KEYS BITS_PER_LONG 20 21 extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS]; 22 23 static __always_inline bool cpu_has_feature(unsigned long feature) 24 { 25 int i; 26 27 BUILD_BUG_ON(!__builtin_constant_p(feature)); 28 BUILD_BUG_ON(__builtin_popcountl(feature) > 1); 29 30 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG 31 if (!static_key_feature_checks_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 __always_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_CPU_HAS_FEATURE_H */ 56