1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Kernel interface for the s390 arch_random_* functions
5 * Copyright IBM Corp. 2017, 2020
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/atomic.h>
18 #include <asm/cpacf.h>
20 DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
21 extern atomic64_t s390_arch_random_counter;
23 static inline bool __must_check arch_get_random_long(unsigned long *v)
28 static inline bool __must_check arch_get_random_int(unsigned int *v)
33 static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
35 if (static_branch_likely(&s390_arch_random_available)) {
36 cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v));
37 atomic64_add(sizeof(*v), &s390_arch_random_counter);
43 static inline bool __must_check arch_get_random_seed_int(unsigned int *v)
45 if (static_branch_likely(&s390_arch_random_available)) {
46 cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v));
47 atomic64_add(sizeof(*v), &s390_arch_random_counter);
53 #endif /* CONFIG_ARCH_RANDOM */
54 #endif /* _ASM_S390_ARCHRANDOM_H */