Add a secondary driver for a pretend-trng (it's a prng at this stage, the trng I found won't synthesize)
This commit is contained in:
Romain Dolbeau
@@ -1,12 +1,9 @@
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/* $NetBSD$ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* Copyright (c) 2020 Romain Dolbeau <romain@dolbeau.org>
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Paul Kranenburg.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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190
NetBSD/9.0/usr/src/sys/dev/sbus/rdfpga_trng.c
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190
NetBSD/9.0/usr/src/sys/dev/sbus/rdfpga_trng.c
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@@ -0,0 +1,190 @@
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/* $NetBSD$ */
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/*-
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* Copyright (c) 2020 Romain Dolbeau <romain@dolbeau.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/bus.h>
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#include <machine/autoconf.h>
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#include <sys/cpu.h>
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#include <sys/conf.h>
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#include <sys/rndsource.h>
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#include <dev/sbus/sbusvar.h>
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#include <dev/sbus/rdfpga_trng.h>
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#include <machine/param.h>
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int rdfpga_trng_print(void *, const char *);
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int rdfpga_trng_match(device_t, cfdata_t, void *);
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void rdfpga_trng_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(rdfpga_trng, sizeof(struct rdfpga_trng_softc),
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rdfpga_trng_match, rdfpga_trng_attach, NULL, NULL);
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dev_type_open(rdfpga_trng_open);
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dev_type_close(rdfpga_trng_close);
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dev_type_ioctl(rdfpga_trng_ioctl);
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const struct cdevsw rdfpga_trng_cdevsw = {
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.d_open = rdfpga_trng_open,
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.d_close = rdfpga_trng_close,
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.d_read = noread,
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.d_write = nowrite,
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.d_ioctl = rdfpga_trng_ioctl,
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.d_stop = nostop,
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.d_tty = notty,
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.d_poll = nopoll,
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.d_mmap = nommap,
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.d_kqfilter = nokqfilter,
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.d_discard = nodiscard,
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.d_flag = 0
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};
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extern struct cfdriver rdfpga_trng_cd;
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#define RDFPGA_TRNG_RD _IOR(0, 1, u_int32_t)
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int
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rdfpga_trng_ioctl (dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
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{
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struct rdfpga_trng_softc *sc = device_lookup_private(&rdfpga_trng_cd, minor(dev));
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int err = 0;
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switch (cmd) {
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case RDFPGA_TRNG_RD:
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*((u_int32_t*)data) = bus_space_read_4(sc->sc_bustag, sc->sc_bhregs, RDFPGA_TRNG_REG_DATA);
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break;
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default:
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err = EINVAL;
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break;
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}
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return(err);
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}
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int
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rdfpga_trng_open(dev_t dev, int flags, int mode, struct lwp *l)
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{
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return (0);
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}
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int
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rdfpga_trng_close(dev_t dev, int flags, int mode, struct lwp *l)
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{
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return (0);
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}
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int
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rdfpga_trng_print(void *aux, const char *busname)
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{
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sbus_print(aux, busname);
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return (UNCONF);
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}
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int
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rdfpga_trng_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct sbus_attach_args *sa = (struct sbus_attach_args *)aux;
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return (strcmp("RDOL,trng", sa->sa_name) == 0);
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}
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static void
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rdfpga_trng_getentropy(size_t nbytes, void *cookie) {
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struct rdfpga_trng_softc *sc = cookie;
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/* aprint_normal_dev(sc->sc_dev, "%s\n", __PRETTY_FUNCTION__); */
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u_int32_t data = bus_space_read_4(sc->sc_bustag, sc->sc_bhregs, RDFPGA_TRNG_REG_DATA);
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rnd_add_data_sync(&sc->sc_rndsource, &data, 4, 32);
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}
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/*
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* Attach all the sub-devices we can find
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*/
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void
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rdfpga_trng_attach(device_t parent, device_t self, void *aux)
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{
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struct sbus_attach_args *sa = aux;
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struct rdfpga_trng_softc *sc = device_private(self);
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struct sbus_softc *sbsc = device_private(parent);
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int node;
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int sbusburst;
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sc->sc_bustag = sa->sa_bustag;
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sc->sc_dev = self;
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if (sbus_bus_map(sc->sc_bustag, sa->sa_slot, sa->sa_offset, sa->sa_size,
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BUS_SPACE_MAP_LINEAR, &sc->sc_bhregs) != 0) {
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aprint_error(": cannot map registers\n");
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return;
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}
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//sc->sc_buffer = bus_space_vaddr(sc->sc_bustag, sc->sc_bhregs);
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sc->sc_bufsiz = sa->sa_size;
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node = sc->sc_node = sa->sa_node;
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/*
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* Get transfer burst size from PROM
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*/
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sbusburst = sbsc->sc_burst;
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if (sbusburst == 0)
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sbusburst = SBUS_BURST_32 - 1; /* 1->16 */
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sc->sc_burst = prom_getpropint(node, "burst-sizes", -1);
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if (sc->sc_burst == -1)
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/* take SBus burst sizes */
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sc->sc_burst = sbusburst;
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/* Clamp at parent's burst sizes */
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sc->sc_burst &= sbusburst;
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aprint_normal("\n");
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aprint_normal_dev(self, "nid 0x%x, bustag %p, burst 0x%x (parent 0x%0x)\n",
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sc->sc_node,
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sc->sc_bustag,
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sc->sc_burst,
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sbsc->sc_burst);
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aprint_normal_dev(self, "garbage 0x%08x\n", bus_space_read_4(sc->sc_bustag, sc->sc_bhregs, RDFPGA_TRNG_REG_DATA));
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aprint_normal_dev(self, "random 0x%08x\n", bus_space_read_4(sc->sc_bustag, sc->sc_bhregs, RDFPGA_TRNG_REG_DATA));
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rndsource_setcb(&sc->sc_rndsource, rdfpga_trng_getentropy, sc);
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rnd_attach_source(&sc->sc_rndsource, device_xname(self), RND_TYPE_RNG, RND_FLAG_HASCB | RND_FLAG_COLLECT_VALUE);
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}
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48
NetBSD/9.0/usr/src/sys/dev/sbus/rdfpga_trng.h
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48
NetBSD/9.0/usr/src/sys/dev/sbus/rdfpga_trng.h
Normal file
@@ -0,0 +1,48 @@
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/* $NetBSD$ */
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/*-
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* Copyright (c) 2020 Romain Dolbeau <romain@dolbeau.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
|
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RDFPGA_TRNG_H_
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#define _RDFPGA_TRNG_H_
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struct rdfpga_trng_softc {
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device_t sc_dev; /* us as a device */
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u_int sc_rev; /* revision */
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int sc_node; /* PROM node ID */
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int sc_burst; /* DVMA burst size in effect */
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bus_space_tag_t sc_bustag; /* bus tag */
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bus_space_handle_t sc_bhregs; /* bus handle */
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//void * sc_buffer; /* VA of the registers */
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int sc_bufsiz; /* Size of buffer */
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struct krndsource sc_rndsource;
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};
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/* ctrl*/
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#define RDFPGA_TRNG_REG_BASE 0x00
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#define RDFPGA_TRNG_REG_DATA (RDFPGA_TRNG_REG_BASE + 0x00)
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#endif /* _RDFPGA_TRNG_H_ */
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