/* $OpenBSD: vrng.c,v 1.7 2021/10/24 17:05:04 mpi Exp $ */ /* * Copyright (c) 2008 Mark Kettenis * * 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 HSVC_GROUP_RNG 0x104 #include struct rng_ctl { uint64_t rng_res : 39; uint64_t rng_wait_cnt : 16; uint64_t rng_bypass : 1; uint64_t rng_vcoctl_sel : 2; uint64_t rng_anlg_sel : 2; uint64_t rng_ctl4 : 1; uint64_t rng_ctl3 : 1; uint64_t rng_ctl2 : 1; uint64_t rng_ctl1 : 1; }; struct vrng_softc { struct device sc_dv; struct timeout sc_to; int sc_count; }; int vrng_match(struct device *, void *, void *); void vrng_attach(struct device *, struct device *, void *); const struct cfattach vrng_ca = { sizeof(struct vrng_softc), vrng_match, vrng_attach }; struct cfdriver vrng_cd = { NULL, "vrng", DV_DULL }; void vrng_rnd(void *); int vrng_match(struct device *parent, void *match, void *aux) { struct vbus_attach_args *va = aux; if (strcmp(va->va_name, "random-number-generator") == 0) return (1); return (0); } void vrng_attach(struct device *parent, struct device *self, void *aux) { struct vrng_softc *sc = (void *)self; uint64_t supported_minor; struct rng_ctl ctl[4]; uint64_t delta; paddr_t addr; int err; if (prom_set_sun4v_api_version(HSVC_GROUP_RNG, 1, 0, &supported_minor)) printf(": unsupported hypervisor\n"); err = hv_rng_get_diag_control(); if (err != H_EOK && err != H_ENOACCESS) printf(": hv_rng_get_diag_control %d\n", err); /* * If we're not the Trusted Domain, the hypervisor call above * will fails with H_ENOACCESS. In that case we hope that the * RNG has been properly initialized. */ if (err == H_EOK) { bzero(ctl, sizeof(ctl)); ctl[0].rng_ctl1 = 1; ctl[0].rng_vcoctl_sel = 0; ctl[0].rng_wait_cnt = 0x3e; ctl[1].rng_ctl2 = 1; ctl[1].rng_vcoctl_sel = 1; ctl[1].rng_wait_cnt = 0x3e; ctl[2].rng_ctl3 = 1; ctl[2].rng_vcoctl_sel = 2; ctl[2].rng_wait_cnt = 0x3e; ctl[3].rng_ctl1 = 1; ctl[3].rng_ctl2 = 1; ctl[3].rng_ctl3 = 1; ctl[3].rng_ctl4 = 1; ctl[3].rng_wait_cnt = 0x3e; if (!pmap_extract(pmap_kernel(), (vaddr_t)&ctl, &addr)) panic("vrng_attach: pmap_extract failed"); err = hv_rng_ctl_write(addr, RNG_STATE_CONFIGURED, 0, &delta); if (err != H_EOK) printf(": hv_rng_ctl_write %d\n", err); } printf("\n"); timeout_set(&sc->sc_to, vrng_rnd, sc); vrng_rnd(sc); } void vrng_rnd(void *v) { struct vrng_softc *sc = v; uint64_t rnd; uint64_t delta; paddr_t addr; int err; if (!pmap_extract(pmap_kernel(), (vaddr_t)&rnd, &addr)) panic("vrng_rnd: pmap_extract failed"); err = hv_rng_data_read(addr, &delta); if (err == H_EOK) { #if 0 if ((sc->sc_count++ % 100) == 0) printf("vrng: %lx\n", rnd); #endif enqueue_randomness(rnd); enqueue_randomness(rnd >> 32); } if (err != H_EOK && err != H_EWOULDBLOCK) printf("vrng_rnd: err = %d\n", err); else timeout_add(&sc->sc_to, 1); }