svn commit: r253122 - head/sys/dev/random
David E. O'Brien
obrien at FreeBSD.org
Tue Jul 9 23:47:29 UTC 2013
Author: obrien
Date: Tue Jul 9 23:47:28 2013
New Revision: 253122
URL: http://svnweb.freebsd.org/changeset/base/253122
Log:
Refactor random_systat to be a *random_systat. This avoids unnecessary
structure copying in random_ident_hardware(). This change will also help
further modularization of random(4) subsystem.
Submitted by: arthurmesh at gmail.com
Reviewed by: obrien
Obtained from: Juniper Networks
Modified:
head/sys/dev/random/probe.c
head/sys/dev/random/randomdev.c
head/sys/dev/random/randomdev.h
head/sys/dev/random/randomdev_soft.c
Modified: head/sys/dev/random/probe.c
==============================================================================
--- head/sys/dev/random/probe.c Tue Jul 9 23:21:57 2013 (r253121)
+++ head/sys/dev/random/probe.c Tue Jul 9 23:47:28 2013 (r253122)
@@ -61,11 +61,11 @@ extern struct random_systat random_ivy;
#endif
void
-random_ident_hardware(struct random_systat *systat)
+random_ident_hardware(struct random_systat **systat)
{
/* Set default to software */
- *systat = random_yarrow;
+ *systat = &random_yarrow;
/* Then go looking for hardware */
#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
@@ -76,7 +76,7 @@ random_ident_hardware(struct random_syst
enable = 1;
TUNABLE_INT_FETCH("hw.nehemiah_rng_enable", &enable);
if (enable)
- *systat = random_nehemiah;
+ *systat = &random_nehemiah;
}
#endif
#ifdef RDRAND_RNG
@@ -86,7 +86,7 @@ random_ident_hardware(struct random_syst
enable = 1;
TUNABLE_INT_FETCH("hw.ivy_rng_enable", &enable);
if (enable)
- *systat = random_ivy;
+ *systat = &random_ivy;
}
#endif
#endif
Modified: head/sys/dev/random/randomdev.c
==============================================================================
--- head/sys/dev/random/randomdev.c Tue Jul 9 23:21:57 2013 (r253121)
+++ head/sys/dev/random/randomdev.c Tue Jul 9 23:47:28 2013 (r253122)
@@ -70,7 +70,7 @@ static struct cdevsw random_cdevsw = {
.d_name = "random",
};
-struct random_systat random_systat;
+struct random_systat *random_systat;
/* For use with make_dev(9)/destroy_dev(9). */
static struct cdev *random_dev;
@@ -88,8 +88,8 @@ random_close(struct cdev *dev __unused,
{
if ((flags & FWRITE) && (priv_check(td, PRIV_RANDOM_RESEED) == 0)
&& (securelevel_gt(td->td_ucred, 0) == 0)) {
- (*random_systat.reseed)();
- random_systat.seeded = 1;
+ (*random_systat->reseed)();
+ random_systat->seeded = 1;
arc4rand(NULL, 0, 1); /* Reseed arc4random as well. */
}
@@ -104,8 +104,8 @@ random_read(struct cdev *dev __unused, s
void *random_buf;
/* Blocking logic */
- if (!random_systat.seeded)
- error = (*random_systat.block)(flag);
+ if (!random_systat->seeded)
+ error = (*random_systat->block)(flag);
/* The actual read */
if (!error) {
@@ -114,7 +114,7 @@ random_read(struct cdev *dev __unused, s
while (uio->uio_resid > 0 && !error) {
c = MIN(uio->uio_resid, PAGE_SIZE);
- c = (*random_systat.read)(random_buf, c);
+ c = (*random_systat->read)(random_buf, c);
error = uiomove(random_buf, c, uio);
}
@@ -139,7 +139,7 @@ random_write(struct cdev *dev __unused,
error = uiomove(random_buf, c, uio);
if (error)
break;
- (*random_systat.write)(random_buf, c);
+ (*random_systat->write)(random_buf, c);
}
free(random_buf, M_TEMP);
@@ -172,10 +172,10 @@ random_poll(struct cdev *dev __unused, i
int revents = 0;
if (events & (POLLIN | POLLRDNORM)) {
- if (random_systat.seeded)
+ if (random_systat->seeded)
revents = events & (POLLIN | POLLRDNORM);
else
- revents = (*random_systat.poll) (events,td);
+ revents = (*random_systat->poll) (events,td);
}
return (revents);
}
@@ -189,11 +189,11 @@ random_modevent(module_t mod __unused, i
switch (type) {
case MOD_LOAD:
random_ident_hardware(&random_systat);
- (*random_systat.init)();
+ (*random_systat->init)();
if (bootverbose)
printf("random: <entropy source, %s>\n",
- random_systat.ident);
+ random_systat->ident);
random_dev = make_dev_credf(MAKEDEV_ETERNAL_KLD, &random_cdevsw,
RANDOM_MINOR, NULL, UID_ROOT, GID_WHEEL, 0666, "random");
@@ -202,7 +202,7 @@ random_modevent(module_t mod __unused, i
break;
case MOD_UNLOAD:
- (*random_systat.deinit)();
+ (*random_systat->deinit)();
destroy_dev(random_dev);
Modified: head/sys/dev/random/randomdev.h
==============================================================================
--- head/sys/dev/random/randomdev.h Tue Jul 9 23:21:57 2013 (r253121)
+++ head/sys/dev/random/randomdev.h Tue Jul 9 23:47:28 2013 (r253122)
@@ -51,7 +51,7 @@ struct random_systat {
random_reseed_func_t *reseed;
};
-extern struct random_systat random_systat;
+extern struct random_systat *random_systat;
-extern void random_ident_hardware(struct random_systat *);
+extern void random_ident_hardware(struct random_systat **);
extern void random_null_func(void);
Modified: head/sys/dev/random/randomdev_soft.c
==============================================================================
--- head/sys/dev/random/randomdev_soft.c Tue Jul 9 23:21:57 2013 (r253121)
+++ head/sys/dev/random/randomdev_soft.c Tue Jul 9 23:47:28 2013 (r253122)
@@ -138,7 +138,7 @@ random_yarrow_init(void)
SYSCTL_ADD_PROC(&random_clist,
SYSCTL_CHILDREN(random_sys_o),
OID_AUTO, "seeded", CTLTYPE_INT | CTLFLAG_RW,
- &random_systat.seeded, 1, random_check_boolean, "I",
+ &random_systat->seeded, 1, random_check_boolean, "I",
"Seeded State");
random_sys_harvest_o = SYSCTL_ADD_NODE(&random_clist,
@@ -362,10 +362,10 @@ random_yarrow_write(void *buf, int count
void
random_yarrow_unblock(void)
{
- if (!random_systat.seeded) {
- random_systat.seeded = 1;
- selwakeuppri(&random_systat.rsel, PUSER);
- wakeup(&random_systat);
+ if (!random_systat->seeded) {
+ random_systat->seeded = 1;
+ selwakeuppri(&random_systat->rsel, PUSER);
+ wakeup(random_systat);
}
(void)atomic_cmpset_int(&arc4rand_iniseed_state, ARC4_ENTR_NONE,
ARC4_ENTR_HAVE);
@@ -377,10 +377,10 @@ random_yarrow_poll(int events, struct th
int revents = 0;
mtx_lock(&random_reseed_mtx);
- if (random_systat.seeded)
+ if (random_systat->seeded)
revents = events & (POLLIN | POLLRDNORM);
else
- selrecord(td, &random_systat.rsel);
+ selrecord(td, &random_systat->rsel);
mtx_unlock(&random_reseed_mtx);
return revents;
@@ -394,12 +394,12 @@ random_yarrow_block(int flag)
mtx_lock(&random_reseed_mtx);
/* Blocking logic */
- while (!random_systat.seeded && !error) {
+ while (!random_systat->seeded && !error) {
if (flag & O_NONBLOCK)
error = EWOULDBLOCK;
else {
printf("Entropy device is blocking.\n");
- error = msleep(&random_systat,
+ error = msleep(random_systat,
&random_reseed_mtx,
PUSER | PCATCH, "block", 0);
}
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