LXR linux/arch/s390/include/asm/archrandom.h

   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
  19DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
  20extern atomic64_t s390_arch_random_counter;
  21
  22bool s390_arch_get_random_long(unsigned long *v);
  23bool s390_arch_random_generate(u8 *buf, unsigned int nbytes);
  24
  25static 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
  32static inline bool __must_check arch_get_random_int(unsigned int *v)
  33{
  34        return false;
  35}
  36
  37static 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
  45static 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