/* $OpenBSD: ccp.c,v 1.2 2018/04/28 15:44:59 jasper Exp $ */ /* * Copyright (c) 2018 David Gwynne * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #define CCP_REG_TRNG 0xc static void ccp_rng(void *); struct cfdriver ccp_cd = { NULL, "ccp", DV_DULL }; void ccp_attach(struct ccp_softc *sc) { timeout_set(&sc->sc_tick, ccp_rng, sc); ccp_rng(sc); printf("\n"); } static void ccp_rng(void *arg) { struct ccp_softc *sc = arg; uint32_t trng; trng = bus_space_read_4(sc->sc_iot, sc->sc_ioh, CCP_REG_TRNG); if (trng != 0) enqueue_randomness(trng); timeout_add_msec(&sc->sc_tick, 100); }