1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Kernel interface for the s390 arch_random_* functions 4 * 5 * Copyright IBM Corp. 2017, 2020 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 19 DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); 20 extern atomic64_t s390_arch_random_counter; 21 22 bool s390_arch_get_random_long(unsigned long *v); 23 bool s390_arch_random_generate(u8 *buf, unsigned int nbytes); 24 25 static inline bool __must_check arch_get_random_long(unsigned long *v) 26 { 27 if (static_branch_likely(&s390_arch_random_available)) 28 return s390_arch_get_random_long(v); 29 return false; 30 } 31 32 static inline bool __must_check arch_get_random_int(unsigned int *v) 33 { 34 return false; 35 } 36 37 static inline bool __must_check arch_get_random_seed_long(unsigned long *v) 38 { 39 if (static_branch_likely(&s390_arch_random_available)) { 40 return s390_arch_random_generate((u8 *)v, sizeof(*v)); 41 } 42 return false; 43 } 44 45 static inline bool __must_check arch_get_random_seed_int(unsigned int *v) 46 { 47 if (static_branch_likely(&s390_arch_random_available)) { 48 return s390_arch_random_generate((u8 *)v, sizeof(*v)); 49 } 50 return false; 51 } 52 53 #endif /* CONFIG_ARCH_RANDOM */ 54 #endif /* _ASM_S390_ARCHRANDOM_H */ 55