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
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
21extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS];
22
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
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