hyperentropy.c revision 1.7.2.3
1 1.7.2.2 tls /* $NetBSD: hyperentropy.c,v 1.7.2.3 2017/12/03 11:39:16 jdolecek Exp $ */ 2 1.7.2.2 tls 3 1.7.2.2 tls /* 4 1.7.2.2 tls * Copyright (c) 2014 Antti Kantee. All Rights Reserved. 5 1.7.2.2 tls * 6 1.7.2.2 tls * Redistribution and use in source and binary forms, with or without 7 1.7.2.2 tls * modification, are permitted provided that the following conditions 8 1.7.2.2 tls * are met: 9 1.7.2.2 tls * 1. Redistributions of source code must retain the above copyright 10 1.7.2.2 tls * notice, this list of conditions and the following disclaimer. 11 1.7.2.2 tls * 2. Redistributions in binary form must reproduce the above copyright 12 1.7.2.2 tls * notice, this list of conditions and the following disclaimer in the 13 1.7.2.2 tls * documentation and/or other materials provided with the distribution. 14 1.7.2.2 tls * 15 1.7.2.2 tls * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 1.7.2.2 tls * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 1.7.2.2 tls * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 1.7.2.2 tls * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 1.7.2.2 tls * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 1.7.2.2 tls * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 1.7.2.2 tls * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 1.7.2.2 tls * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 1.7.2.2 tls * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 1.7.2.2 tls * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 1.7.2.2 tls * SUCH DAMAGE. 26 1.7.2.2 tls */ 27 1.7.2.2 tls 28 1.7.2.2 tls #include <sys/cdefs.h> 29 1.7.2.2 tls __KERNEL_RCSID(0, "$NetBSD: hyperentropy.c,v 1.7.2.3 2017/12/03 11:39:16 jdolecek Exp $"); 30 1.7.2.2 tls 31 1.7.2.2 tls #include <sys/param.h> 32 1.7.2.2 tls #include <sys/kmem.h> 33 1.7.2.3 jdolecek #include <sys/mutex.h> 34 1.7.2.3 jdolecek #include <sys/rndpool.h> 35 1.7.2.3 jdolecek #include <sys/rndsource.h> 36 1.7.2.2 tls 37 1.7.2.3 jdolecek #include <rump-sys/kern.h> 38 1.7.2.2 tls 39 1.7.2.3 jdolecek #include <rump/rumpuser.h> 40 1.7.2.2 tls 41 1.7.2.3 jdolecek static kmutex_t rndsrc_lock; 42 1.7.2.2 tls static krndsource_t rndsrc; 43 1.7.2.2 tls 44 1.7.2.2 tls #define MAXGET (RND_POOLBITS/NBBY) 45 1.7.2.2 tls static void 46 1.7.2.3 jdolecek feedrandom(size_t bytes, void *cookie __unused) 47 1.7.2.2 tls { 48 1.7.2.2 tls uint8_t *rnddata; 49 1.7.2.3 jdolecek size_t n, nread; 50 1.7.2.2 tls 51 1.7.2.2 tls rnddata = kmem_intr_alloc(MAXGET, KM_SLEEP); 52 1.7.2.3 jdolecek n = 0; 53 1.7.2.3 jdolecek while (n < MIN(MAXGET, bytes)) { 54 1.7.2.3 jdolecek if (rumpuser_getrandom(rnddata + n, MIN(MAXGET, bytes) - n, 55 1.7.2.3 jdolecek RUMPUSER_RANDOM_HARD|RUMPUSER_RANDOM_NOWAIT, &nread) 56 1.7.2.3 jdolecek != 0) 57 1.7.2.3 jdolecek break; 58 1.7.2.3 jdolecek n += MIN(nread, MIN(MAXGET, bytes) - n); 59 1.7.2.3 jdolecek } 60 1.7.2.3 jdolecek if (n) { 61 1.7.2.3 jdolecek mutex_enter(&rndsrc_lock); 62 1.7.2.3 jdolecek rnd_add_data_sync(&rndsrc, rnddata, n, NBBY*n); 63 1.7.2.3 jdolecek mutex_exit(&rndsrc_lock); 64 1.7.2.3 jdolecek } 65 1.7.2.2 tls kmem_intr_free(rnddata, MAXGET); 66 1.7.2.2 tls } 67 1.7.2.2 tls 68 1.7.2.2 tls void 69 1.7.2.2 tls rump_hyperentropy_init(void) 70 1.7.2.2 tls { 71 1.7.2.2 tls 72 1.7.2.3 jdolecek mutex_init(&rndsrc_lock, MUTEX_DEFAULT, IPL_VM); 73 1.7.2.3 jdolecek 74 1.7.2.3 jdolecek rndsource_setcb(&rndsrc, &feedrandom, NULL); 75 1.7.2.3 jdolecek rnd_attach_source(&rndsrc, "rump_hyperent", RND_TYPE_VM, 76 1.7.2.3 jdolecek RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB); 77 1.7.2.3 jdolecek feedrandom(MAXGET, NULL); 78 1.7.2.2 tls } 79
Indexes created Wed Oct 22 00:09:40 GMT 2025