src/sys/kern/kern_entropy.c - diff

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version 1.13, 2020/05/07 19:05:51

version 1.14, 2020/05/07 19:07:29

Line 172 struct {

} entropy_global __cacheline_aligned = {

/* Fields that must be initialized when the kernel is loaded. */

.needed = ENTROPY_CAPACITY*NBBY,

.epoch = (unsigned)-1, /* -1 means not yet full entropy */

.epoch = (unsigned)-1, /* -1 means entropy never consolidated */

.sources = LIST_HEAD_INITIALIZER(entropy_global.sources),

.stage = ENTROPY_COLD,

};

Line 596 entropy_bootrequest(void)

* entropy_epoch()

* Returns the current entropy epoch. If this changes, you should

* reseed. If -1, means the system has not yet reached full

* reseed. If -1, means system entropy has not yet reached full

* entropy; never reverts back to -1 after full entropy has been

* entropy or been explicitly consolidated; never reverts back to

* reached. Never zero, so you can always use zero as an

* -1. Never zero, so you can always use zero as an uninitialized

* uninitialized sentinel value meaning `reseed ASAP'.

* sentinel value meaning `reseed ASAP'.

* Usage model:

Line 1118 entropy_notify(void)

* that we're ready so operators can compare it to the timing

* of other events.

if (E->epoch == (unsigned)-1)

if (__predict_false(!rnd_initial_entropy) && E->needed == 0) {

printf("entropy: ready\n");

rnd_initial_entropy = 1;

}

/* Set the epoch; roll over from UINTMAX-1 to 1. */

rnd_initial_entropy = 1; /* XXX legacy */

if (__predict_true(!atomic_load_relaxed(&entropy_depletion)) ||

ratecheck(&lasttime, &interval)) {

epoch = E->epoch + 1;