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 early_cpu_has_feature(unsigned long feature)10static __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 cpu_has_feature(unsigned long feature)23static __always_inline bool cpu_has_feature(unsigned long feature) 24 { 25 int i; 26 27 #ifndef __clang__ /* clang can't cope with this */ 28 BUILD_BUG_ON(!__builtin_constant_p(feature)); 29 #endif 30 31 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG 32 if (!static_key_initialized) { 33 printk("Warning! cpu_has_feature() used prior to jump label init!\n"); 34 dump_stack(); 35 return early_cpu_has_feature(feature); 36 } 37 #endif 38 39 if (CPU_FTRS_ALWAYS & feature) 40 return true; 41 42 if (!(CPU_FTRS_POSSIBLE & feature)) 43 return false; 44 45 i = __builtin_ctzl(feature); 46 return static_branch_likely(&cpu_feature_keys[i]); 47 } 48 #else cpu_has_feature(unsigned long feature)49static __always_inline bool cpu_has_feature(unsigned long feature) 50 { 51 return early_cpu_has_feature(feature); 52 } 53 #endif 54 55 #endif /* __ASSEMBLY__ */ 56 #endif /* __ASM_POWERPC_CPU_HAS_FEATURE_H */ 57