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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
9static 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
20extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS];
21
22static __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
48static 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 */