62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/* $OpenBSD: ccp.c,v 1.3 2020/05/29 04:42:25 deraadt Exp $ */
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/*
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* Copyright (c) 2018 David Gwynne <dlg@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/timeout.h>
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#include <machine/bus.h>
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#include <dev/ic/ccpvar.h>
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#define CCP_REG_TRNG 0xc
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static void ccp_rng(void *);
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struct cfdriver ccp_cd = {
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NULL,
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"ccp",
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DV_DULL
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};
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void
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ccp_attach(struct ccp_softc *sc)
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{
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timeout_set(&sc->sc_tick, ccp_rng, sc);
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ccp_rng(sc);
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printf("\n");
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}
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static void
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ccp_rng(void *arg)
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{
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struct ccp_softc *sc = arg;
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uint32_t trng;
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trng = bus_space_read_4(sc->sc_iot, sc->sc_ioh, CCP_REG_TRNG);
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if (trng != 0)
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enqueue_randomness(trng);
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timeout_add_msec(&sc->sc_tick, 100);
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}
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