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 	BUILD_BUG_ON(!__builtin_constant_p(feature));
27 
28 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
29 	if (!static_key_initialized) {
30 		printk("Warning! cpu_has_feature() used prior to jump label init!\n");
31 		dump_stack();
32 		return early_cpu_has_feature(feature);
33 	}
34 #endif
35 
36 	if (CPU_FTRS_ALWAYS & feature)
37 		return true;
38 
39 	if (!(CPU_FTRS_POSSIBLE & feature))
40 		return false;
41 
42 	i = __builtin_ctzl(feature);
43 	return static_branch_likely(&cpu_feature_keys[i]);
44 }
45 #else
46 static inline bool cpu_has_feature(unsigned long feature)
47 {
48 	return early_cpu_has_feature(feature);
49 }
50 #endif
51 
52 #endif /* __ASSEMBLY__ */
53 #endif /* __ASM_POWERPC_CPUFEATURE_H */
54