Release 4.14 arch/s390/crypto/arch_random.c

/*
 * s390 arch random implementation.
 *
 * Copyright IBM Corp. 2017
 * Author(s): Harald Freudenberger <freude@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/atomic.h>
#include <linux/random.h>
#include <linux/static_key.h>
#include <asm/cpacf.h>


DEFINE_STATIC_KEY_FALSE(s390_arch_random_available);


atomic64_t s390_arch_random_counter = ATOMIC64_INIT(0);

EXPORT_SYMBOL(s390_arch_random_counter);



static int __init s390_arch_random_init(void)
{
	/* check if subfunction CPACF_PRNO_TRNG is available */
	if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
		static_branch_enable(&s390_arch_random_available);

	return 0;
}
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Harald Freudenberger
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arch_initcall(s390_arch_random_init);
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Heiko Carstens
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Directory: arch/s390/crypto

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