| /* |
| * Kernel interface for the s390 arch_random_* functions |
| * |
| * Copyright IBM Corp. 2017 |
| * |
| * 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> |
| #include <asm/cpacf.h> |
| |
| DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); |
| extern atomic64_t s390_arch_random_counter; |
| |
| static void s390_arch_random_generate(u8 *buf, unsigned int nbytes) |
| { |
| cpacf_trng(NULL, 0, buf, nbytes); |
| atomic64_add(nbytes, &s390_arch_random_counter); |
| } |
| |
| static inline bool arch_has_random(void) |
| { |
| if (static_branch_likely(&s390_arch_random_available)) |
| return true; |
| return false; |
| } |
| |
| static inline bool arch_has_random_seed(void) |
| { |
| return arch_has_random(); |
| } |
| |
| static inline bool arch_get_random_long(unsigned long *v) |
| { |
| if (static_branch_likely(&s390_arch_random_available)) { |
| s390_arch_random_generate((u8 *)v, sizeof(*v)); |
| return true; |
| } |
| return false; |
| } |
| |
| static inline bool arch_get_random_int(unsigned int *v) |
| { |
| if (static_branch_likely(&s390_arch_random_available)) { |
| s390_arch_random_generate((u8 *)v, sizeof(*v)); |
| return true; |
| } |
| return false; |
| } |
| |
| static inline bool arch_get_random_seed_long(unsigned long *v) |
| { |
| return arch_get_random_long(v); |
| } |
| |
| static inline bool arch_get_random_seed_int(unsigned int *v) |
| { |
| return arch_get_random_int(v); |
| } |
| |
| #endif /* CONFIG_ARCH_RANDOM */ |
| #endif /* _ASM_S390_ARCHRANDOM_H */ |
