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stir in something at initialisation

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This commit is contained in:
dan 2002-10-07 02:38:41 +00:00
parent 99f05800ca
commit 168dbd282b
1 changed files with 19 additions and 2 deletions

21
sys/dev/rnd.c

@ -1,4 +1,4 @@
/* $NetBSD: rnd.c,v 1.28 2002/09/06 13:18:43 gehenna Exp $ */
/* $NetBSD: rnd.c,v 1.29 2002/10/07 02:38:41 dan Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rnd.c,v 1.28 2002/09/06 13:18:43 gehenna Exp $");
__KERNEL_RCSID(0, "$NetBSD: rnd.c,v 1.29 2002/10/07 02:38:41 dan Exp $");
#include <sys/param.h>
#include <sys/ioctl.h>
@ -285,10 +285,17 @@ rndattach(int num)
void
rnd_init(void)
{
#ifdef __HAVE_CPU_COUNTER
u_int32_t c;
#endif
if (rnd_ready)
return;
#ifdef __HAVE_CPU_COUNTER
c = rnd_counter();
#endif
LIST_INIT(&rnd_sources);
SIMPLEQ_INIT(&rnd_samples);
@ -297,6 +304,16 @@ rnd_init(void)
rndpool_init(&rnd_pool);
#ifdef __HAVE_CPU_COUNTER
/* Mix *something*, *anything* into the pool to help it get started.
* However, it's not safe for rnd_counter to call microtime() yet, so
* we can only do this on platforms with a cpu counter.
* XXX more things to add would be nice.
*/
rndpool_add_data(&rnd_pool, &c, sizeof(u_int32_t), 0);
c = rnd_counter();
rndpool_add_data(&rnd_pool, &c, sizeof(u_int32_t), 0);
#endif
rnd_ready = 1;
#ifdef RND_VERBOSE