Date: Tue, 25 Sep 2012 14:55:47 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r240921 - head/sys/kern Message-ID: <201209251455.q8PEtlE0047965@svn.freebsd.org>
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Author: jhb Date: Tue Sep 25 14:55:46 2012 New Revision: 240921 URL: http://svn.freebsd.org/changeset/base/240921 Log: 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. Reviewed by: markm, obrien MFC after: 2 weeks Modified: head/sys/kern/kern_intr.c Modified: head/sys/kern/kern_intr.c ============================================================================== --- head/sys/kern/kern_intr.c Tue Sep 25 13:34:09 2012 (r240920) +++ head/sys/kern/kern_intr.c Tue Sep 25 14:55:46 2012 (r240921) @@ -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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