1 #ifndef __ASM_POWERPC_CPU_HAS_FEATURE_H
2 #define __ASM_POWERPC_CPU_HAS_FEATURE_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_CPU_HAS_FEATURE_H */
56