Author: jhb
Date: Wed Feb 27 22:02:40 2013
New Revision: 247423
URL: http://svnweb.freebsd.org/changeset/base/247423
Log:
MFC 240921:
Add optional entropy harvesting for software interrupts in swi_sched()
as controlled by kern.random.sys.harvest.swi. SWI harvesting feeds into
the interrupt FIFO and each event is estimated as providing a single bit of
entropy.
Modified:
stable/9/sys/kern/kern_intr.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/kern/kern_intr.c
==============================================================================
--- stable/9/sys/kern/kern_intr.c Wed Feb 27 21:58:06 2013
(r247422)
+++ stable/9/sys/kern/kern_intr.c Wed Feb 27 22:02:40 2013
(r247423)
@@ -1144,11 +1144,21 @@ swi_sched(void *cookie, int flags)
{
struct intr_handler *ih = (struct intr_handler *)cookie;
struct intr_event *ie = ih->ih_event;
+ struct intr_entropy entropy;
int error;
CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name,
ih->ih_need);
+ if (harvest.swi) {
+ CTR2(KTR_INTR, "swi_sched: pid %d (%s) gathering entropy",
+ curproc->p_pid, curthread->td_name);
+ entropy.event = (uintptr_t)ih;
+ entropy.td = curthread;
+ random_harvest(&entropy, sizeof(entropy), 1, 0,
+ RANDOM_INTERRUPT);
+ }
+
/*
* Set ih_need for this handler so that if the ithread is already
* running it will execute this handler on the next pass. Otherwise,
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