| /* 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 */ |