/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright (c) 2018, Joyent, Inc.
 * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
 */

#ifndef _SYS_RANDOM_H
#define _SYS_RANDOM_H

#include <sys/types.h>
#include <sys/atomic.h>

#ifdef  __cplusplus
extern "C" {
#endif

/* stats for the random number devices, /dev/random and /dev/urandom. */
typedef struct rnd_stats {
        uint64_t        rs_rndOut;      /* Bytes generated for /dev/random */
        uint64_t        rs_rndcOut;     /* Bytes read from /dev/random cache */
        uint64_t        rs_urndOut;     /* Bytes generated for /dev/urandom */
} rnd_stats_t;

/* stats for the kernel random number provider, swrand. */
typedef struct swrand_stats {
        uint32_t        ss_entEst;      /* Entropy estimate in bits */
        uint64_t        ss_entIn;       /* Entropy bits added to pool */
        uint64_t        ss_entOut;      /* Entropy bits extracted from pool */
        uint64_t        ss_bytesIn;     /* Total data bytes added to pool */
        uint64_t        ss_bytesOut;    /* Total data bytes extracted from */
                                        /* the pool */
} swrand_stats_t;

#if defined(_KERNEL) || defined(_FAKE_KERNEL)

#define BUMP_CPU_RND_STATS(rm, x, v)    (((rm)->rm_mag.rm_stats).x += (v))
#define BUMP_RND_STATS(x, v)    atomic_add_64(&(rnd_stats).x, (v))
#define BUMP_SWRAND_STATS(x, v) atomic_add_64(&(swrand_stats).x, (v))

extern int random_add_entropy(uint8_t *, size_t, uint_t);
extern int random_get_bytes(uint8_t *, size_t);
extern int random_get_blocking_bytes(uint8_t *, size_t);
extern int random_get_pseudo_bytes(uint8_t *, size_t);

#endif /* _KERNEL */

/*
 * Flags for the getrandom(2) system call.
 */
#define GRND_NONBLOCK   0x0001          /* O_NONBLOCK equiv */
#define GRND_RANDOM     0x0002          /* Use /dev/random, not /dev/urandom */
extern ssize_t getrandom(void *, size_t, unsigned int);

#ifdef  __cplusplus
}
#endif

#endif /* _SYS_RANDOM_H */