add support for true RNG presented on the i82802 FWH.

it produces 1 byte at a time and has no ready irq, thus timeout driven.
in fact w/ default hz=100 it produces up to 60% of
gross entropy production in an average loaded desktop system.

1 files changed, 117 insertions, 3 deletions

diff --git a/sys/arch/i386/pci/pchb.c b/sys/arch/i386/pci/pchb.c
index 3703fa2a1b8..6aedd48b169 100644
--- a/sys/arch/i386/pci/pchb.c
+++ b/sys/arch/i386/pci/pchb.c
@@ -1,5 +1,36 @@
+/*	$OpenBSD: pchb.c,v 1.7 2000/04/10 20:07:47 mickey Exp $	*/
 /*	$NetBSD: pchb.c,v 1.6 1997/06/06 23:29:16 thorpej Exp $	*/
 
+/*
+ * Copyright (c) 2000 Michael Shalayeff
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Michael Shalayeff.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
 /*-
  * Copyright (c) 1996 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -36,18 +67,22 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <sys/types.h>
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/device.h>
+#include <sys/proc.h>
+#include <sys/timeout.h>
 
 #include <machine/bus.h>
 
 #include <dev/pci/pcivar.h>
 #include <dev/pci/pcireg.h>
-
 #include <dev/pci/pcidevs.h>
 
+#include <dev/rndvar.h>
+
+#include <dev/ic/i82802reg.h>
+
 #define PCISET_BRIDGETYPE_MASK	0x3
 #define PCISET_TYPE_COMPAT	0x1
 #define PCISET_TYPE_AUX		0x2
@@ -65,19 +100,32 @@
 #define I82424_BCTL_PCIMEM_BURSTEN	0x01
 #define I82424_BCTL_PCI_BURSTEN		0x02
 
+struct pchb_softc {
+	struct device sc_dev;
+
+	bus_space_tag_t bt;
+	bus_space_handle_t bh;
+
+	/* rng stuff */
+	int ax;
+	int i;
+	struct timeout sc_tmo;
+};
+
 int	pchbmatch __P((struct device *, void *, void *));
 void	pchbattach __P((struct device *, struct device *, void *));
 
 int	pchb_print __P((void *, const char *));
 
 struct cfattach pchb_ca = {
-	sizeof(struct device), pchbmatch, pchbattach
+	sizeof(struct pchb_softc), pchbmatch, pchbattach
 };
 
 struct cfdriver pchb_cd = {
 	NULL, "pchb", DV_DULL
 };
 
+void pchb_rnd __P((void *v));
 
 int
 pchbmatch(parent, match, aux)
@@ -98,10 +146,12 @@ pchbattach(parent, self, aux)
 	struct device *parent, *self;
 	void *aux;
 {
+	struct pchb_softc *sc = (struct pchb_softc *)self;
 	struct pci_attach_args *pa = aux;
 	struct pcibus_attach_args pba;
 	pcireg_t bcreg;
 	u_char bdnum, pbnum;
+	int i;
 
 	/*
 	 * Print out a description, and configure certain chipsets which
@@ -149,6 +199,45 @@ pchbattach(parent, self, aux)
 				printf(": disabled CPU-PCI write posting");
 			}
 			break;
+		case PCI_PRODUCT_INTEL_82810E_MCH:
+			sc->bt = pa->pa_memt;
+			if (bus_space_map(sc->bt, I82802_IOBASE, I82802_IOSIZE,
+			    0, &sc->bh) < 0)
+				break;
+
+			/* probe and init rng */
+			if (bus_space_read_1(sc->bt, sc->bh,
+			    I82802_RNG_HWST) & I82802_RNG_HWST_PRESENT) {
+				int r;
+
+				/* enable RNG */
+				bus_space_write_1(sc->bt, sc->bh,
+						I82802_RNG_HWST,
+				    bus_space_read_1(sc->bt, sc->bh,
+						I82802_RNG_HWST) |
+				    I82802_RNG_HWST_ENABLE);
+
+				/*
+				 * see if we can read anything,
+				 * and it passed the test
+				 */
+				for (i = 1000; i-- &&
+		    !(bus_space_read_1(sc->bt, sc->bh, I82802_RNG_RNGST) &
+		      I82802_RNG_RNGST_DATAV); DELAY(10));
+
+				if (bus_space_read_1(sc->bt, sc->bh,
+				    I82802_RNG_RNGST) & I82802_RNG_RNGST_DATAV
+				    && (r = bus_space_read_1(sc->bt, sc->bh,
+					I82802_RNG_DATA)) != 0
+				    /*&& runfipstest()>=0*/) {
+					printf (": RNG(%x)", r);
+
+					sc->i = 4;
+					timeout_set(&sc->sc_tmo, pchb_rnd, sc);
+					timeout_add(&sc->sc_tmo, 1);
+				}
+			}
+			break;
 		default:
 			break;
 		}
@@ -168,3 +257,28 @@ pchb_print(aux, pnp)
 	printf(" bus %d", pba->pba_bus);
 	return (UNCONF);
 }
+
+
+void
+pchb_rnd(v)
+	void *v;
+{
+	struct pchb_softc *sc = v;
+	int s, ret = -1;
+
+	s = splhigh();
+	if (bus_space_read_1(sc->bt, sc->bh, I82802_RNG_RNGST) &
+	    I82802_RNG_RNGST_DATAV)
+		ret = bus_space_read_1(sc->bt, sc->bh, I82802_RNG_DATA);
+	splx(s);
+
+	if (ret >= 0) {
+		if (sc->i--)
+			sc->ax = (sc->ax << 8) + ret;
+		else {
+			sc->i = 4;
+			add_true_randomness(ret);
+		}
+	}
+	timeout_add(&sc->sc_tmo, 1);
+}