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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Kernel interface for the s390 arch_random_* functions
4 *
5 * Copyright IBM Corp. 2017
6 *
7 * Author: Harald Freudenberger <freude@de.ibm.com>
8 *
9 */
10
11#ifndef _ASM_S390_ARCHRANDOM_H
12#define _ASM_S390_ARCHRANDOM_H
13
14#ifdef CONFIG_ARCH_RANDOM
15
16#include <linux/static_key.h>
17#include <linux/atomic.h>
18
19DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
20extern atomic64_t s390_arch_random_counter;
21
22bool s390_arch_random_generate(u8 *buf, unsigned int nbytes);
23
24static inline bool __must_check arch_get_random_long(unsigned long *v)
25{
26 return false;
27}
28
29static inline bool __must_check arch_get_random_int(unsigned int *v)
30{
31 return false;
32}
33
34static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
35{
36 if (static_branch_likely(&s390_arch_random_available)) {
37 return s390_arch_random_generate((u8 *)v, sizeof(*v));
38 }
39 return false;
40}
41
42static inline bool __must_check arch_get_random_seed_int(unsigned int *v)
43{
44 if (static_branch_likely(&s390_arch_random_available)) {
45 return s390_arch_random_generate((u8 *)v, sizeof(*v));
46 }
47 return false;
48}
49
50#endif /* CONFIG_ARCH_RANDOM */
51#endif /* _ASM_S390_ARCHRANDOM_H */