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Add optional entropy harvesting for software interrupts in swi_sched()

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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.

Reviewed by:	markm, obrien
MFC after:	2 weeks
This commit is contained in:
jhb 2012-09-25 14:55:46 +00:00
parent 446cdf51f3
commit cabd8b8de7
1 changed files with 10 additions and 0 deletions
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10
sys/kern/kern_intr.c
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@ -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,