[src/trunk]: src/sys/rump/librump/rumpkern Restore simplicity of rump hyperen...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/96022484e8a1
branches:  trunk
changeset: 807750:96022484e8a1
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Tue Apr 21 03:53:50 2015 +0000

description:
Restore simplicity of rump hyperentropy `hardware RNG'.

diffstat:

 sys/rump/librump/rumpkern/hyperentropy.c |  46 ++++---------------------------
 1 files changed, 6 insertions(+), 40 deletions(-)

diffs (81 lines):

diff -r 0abcdd9fcc09 -r 96022484e8a1 sys/rump/librump/rumpkern/hyperentropy.c
--- a/sys/rump/librump/rumpkern/hyperentropy.c  Tue Apr 21 03:53:07 2015 +0000
+++ b/sys/rump/librump/rumpkern/hyperentropy.c  Tue Apr 21 03:53:50 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: hyperentropy.c,v 1.8 2015/04/13 16:46:33 riastradh Exp $       */
+/*     $NetBSD: hyperentropy.c,v 1.9 2015/04/21 03:53:50 riastradh Exp $       */
 
 /*
  * Copyright (c) 2014 Antti Kantee.  All Rights Reserved.
@@ -26,10 +26,9 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: hyperentropy.c,v 1.8 2015/04/13 16:46:33 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: hyperentropy.c,v 1.9 2015/04/21 03:53:50 riastradh Exp $");
 
 #include <sys/param.h>
-#include <sys/atomic.h>
 #include <sys/kmem.h>
 #include <sys/rndpool.h>
 #include <sys/rndsource.h>
@@ -39,12 +38,10 @@
 #include "rump_private.h"
 
 static krndsource_t rndsrc;
-static volatile unsigned hyperentropy_wanted;
-static void *feedrandom_softint;
 
 #define MAXGET (RND_POOLBITS/NBBY)
 static void
-feedrandom(size_t bytes)
+feedrandom_cb(size_t bytes, void *cookie __unused)
 {
        uint8_t *rnddata;
        size_t dsize;
@@ -56,42 +53,11 @@
        kmem_intr_free(rnddata, MAXGET);
 }
 
-static void
-feedrandom_intr(void *cookie __unused)
-{
-
-       feedrandom(atomic_swap_uint(&hyperentropy_wanted, 0));
-}
-
-static void
-feedrandom_cb(size_t bytes, void *cookie __unused)
-{
-       unsigned old, new;
-
-       do {
-               old = hyperentropy_wanted;
-               new = ((MAXGET - old) < bytes? MAXGET : (old + bytes));
-       } while (atomic_cas_uint(&hyperentropy_wanted, old, new) != old);
-
-       softint_schedule(feedrandom_softint);
-}
-
 void
 rump_hyperentropy_init(void)
 {
 
-       if (rump_threads) {
-               feedrandom_softint =
-                   softint_establish(SOFTINT_CLOCK|SOFTINT_MPSAFE,
-                       feedrandom_intr, NULL);
-               KASSERT(feedrandom_softint != NULL);
-               rndsource_setcb(&rndsrc, feedrandom_cb, &rndsrc);
-               rnd_attach_source(&rndsrc, "rump_hyperent", RND_TYPE_VM,
-                   RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
-       } else {
-               /* without threads, just fill the pool */
-               rnd_attach_source(&rndsrc, "rump_hyperent", RND_TYPE_VM,
-                   RND_FLAG_COLLECT_VALUE);
-               feedrandom(MAXGET);
-       }
+       rndsource_setcb(&rndsrc, &feedrandom_cb, &rndsrc);
+       rnd_attach_source(&rndsrc, "rump_hyperent", RND_TYPE_VM,
+           RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
 }