/* SPDX-License-Identifier: GPL-2.0 */ /* * Kernel interface for the s390 arch_random_* functions * * Copyright IBM Corp. 2017, 2020 * * Author: Harald Freudenberger <freude@de.ibm.com> * */ #ifndef _ASM_S390_ARCHRANDOM_H #define _ASM_S390_ARCHRANDOM_H #ifdef CONFIG_ARCH_RANDOM #include <linux/static_key.h> #include <linux/atomic.h> DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); extern atomic64_t s390_arch_random_counter; bool s390_arch_get_random_long(unsigned long *v); bool s390_arch_random_generate(u8 *buf, unsigned int nbytes); static inline bool __must_check arch_get_random_long(unsigned long *v) { if (static_branch_likely(&s390_arch_random_available)) return s390_arch_get_random_long(v); return false; } static inline bool __must_check arch_get_random_int(unsigned int *v) { return false; } static inline bool __must_check arch_get_random_seed_long(unsigned long *v) { if (static_branch_likely(&s390_arch_random_available)) { return s390_arch_random_generate((u8 *)v, sizeof(*v)); } return false; } static inline bool __must_check arch_get_random_seed_int(unsigned int *v) { if (static_branch_likely(&s390_arch_random_available)) { return s390_arch_random_generate((u8 *)v, sizeof(*v)); } return false; } #endif /* CONFIG_ARCH_RANDOM */ #endif /* _ASM_S390_ARCHRANDOM_H */