38 lines
947 B
C
38 lines
947 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Kernel interface for the s390 arch_random_* functions
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*
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* Copyright IBM Corp. 2017, 2022
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*
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* Author: Harald Freudenberger <freude@de.ibm.com>
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*
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*/
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#ifndef _ASM_S390_ARCHRANDOM_H
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#define _ASM_S390_ARCHRANDOM_H
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#include <linux/static_key.h>
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#include <linux/preempt.h>
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#include <linux/atomic.h>
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#include <asm/cpacf.h>
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DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
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extern atomic64_t s390_arch_random_counter;
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static inline size_t __must_check arch_get_random_longs(unsigned long *v, size_t max_longs)
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{
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return 0;
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}
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static inline size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
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{
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if (static_branch_likely(&s390_arch_random_available) &&
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in_task()) {
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cpacf_trng(NULL, 0, (u8 *)v, max_longs * sizeof(*v));
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atomic64_add(max_longs * sizeof(*v), &s390_arch_random_counter);
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return max_longs;
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}
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return 0;
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}
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#endif /* _ASM_S390_ARCHRANDOM_H */
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