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Linux kernel mirror (for testing)
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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
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 64
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 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
46static 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 */