1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Kernel interface for the s390 arch_random_* functions
5 * Copyright IBM Corp. 2017, 2022
7 * Author: Harald Freudenberger <freude@de.ibm.com>
11 #ifndef _ASM_S390_ARCHRANDOM_H
12 #define _ASM_S390_ARCHRANDOM_H
14 #ifdef CONFIG_ARCH_RANDOM
16 #include <linux/static_key.h>
17 #include <linux/preempt.h>
18 #include <linux/atomic.h>
19 #include <asm/cpacf.h>
21 DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
22 extern atomic64_t s390_arch_random_counter;
24 static inline bool __must_check arch_get_random_long(unsigned long *v)
29 static inline bool __must_check arch_get_random_int(unsigned int *v)
34 static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
36 if (static_branch_likely(&s390_arch_random_available) &&
38 cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v));
39 atomic64_add(sizeof(*v), &s390_arch_random_counter);
45 static inline bool __must_check arch_get_random_seed_int(unsigned int *v)
47 if (static_branch_likely(&s390_arch_random_available) &&
49 cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v));
50 atomic64_add(sizeof(*v), &s390_arch_random_counter);
56 #endif /* CONFIG_ARCH_RANDOM */
57 #endif /* _ASM_S390_ARCHRANDOM_H */