221 lines
6.5 KiB
C
221 lines
6.5 KiB
C
/* $NetBSD: pchb_rnd.c,v 1.8 2008/03/04 15:33:06 cube Exp $ */
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/*
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* Copyright (c) 2000 Michael Shalayeff
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Michael Shalayeff.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from OpenBSD: pchb.c,v 1.23 2000/10/23 20:07:30 deraadt Exp
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pchb_rnd.c,v 1.8 2008/03/04 15:33:06 cube Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/time.h>
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#include <machine/bus.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcidevs.h>
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#include <arch/x86/pci/i82802reg.h>
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#include <arch/x86/pci/pchbvar.h>
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static void pchb_rnd_callout(void *v);
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#define PCHB_RNG_RETRIES 1000
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#define PCHB_RNG_MIN_SAMPLES 10
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void
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pchb_detach_rnd(struct pchb_softc *sc)
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{
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uint8_t reg8;
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if (!sc->sc_rnd_attached)
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return;
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/* pch is polled for entropy, so no estimate is available. */
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rnd_detach_source(&sc->sc_rnd_source);
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callout_stop(&sc->sc_rnd_ch);
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callout_destroy(&sc->sc_rnd_ch);
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/* Disable the RNG. */
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reg8 = bus_space_read_1(sc->sc_st, sc->sc_sh, I82802_RNG_HWST);
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bus_space_write_1(sc->sc_st, sc->sc_sh, I82802_RNG_HWST,
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reg8 & ~I82802_RNG_HWST_ENABLE);
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bus_space_unmap(sc->sc_st, sc->sc_sh, I82802_IOSIZE);
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sc->sc_rnd_attached = false;
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}
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void
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pchb_attach_rnd(struct pchb_softc *sc, struct pci_attach_args *pa)
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{
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int i, j, count_ff;
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uint8_t reg8;
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if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_INTEL)
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return;
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switch (PCI_PRODUCT(pa->pa_id)) {
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#if defined(__i386__)
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/* Old chipsets which only support IA32 CPUs. */
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case PCI_PRODUCT_INTEL_82810E_MCH:
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case PCI_PRODUCT_INTEL_82810_DC100_MCH:
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case PCI_PRODUCT_INTEL_82810_MCH:
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case PCI_PRODUCT_INTEL_82815_DC100_HUB:
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case PCI_PRODUCT_INTEL_82815_NOAGP_HUB:
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case PCI_PRODUCT_INTEL_82815_NOGRAPH_HUB:
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case PCI_PRODUCT_INTEL_82815_FULL_HUB:
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case PCI_PRODUCT_INTEL_82820_MCH:
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case PCI_PRODUCT_INTEL_82840_HB:
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case PCI_PRODUCT_INTEL_82845_HB:
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case PCI_PRODUCT_INTEL_82850_HB:
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case PCI_PRODUCT_INTEL_82860_HB:
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case PCI_PRODUCT_INTEL_82865_HB:
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case PCI_PRODUCT_INTEL_82875P_HB:
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#endif /* defined((__i386__) */
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/* New chipsets which support EM64T CPUs. */
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case PCI_PRODUCT_INTEL_82915G_HB:
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case PCI_PRODUCT_INTEL_82915GM_HB:
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case PCI_PRODUCT_INTEL_82925X_HB:
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case PCI_PRODUCT_INTEL_82945P_MCH:
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case PCI_PRODUCT_INTEL_82955X_HB:
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break;
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default:
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return;
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}
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sc->sc_st = pa->pa_memt;
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if (bus_space_map(sc->sc_st, I82802_IOBASE, I82802_IOSIZE, 0,
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&sc->sc_sh) != 0) {
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/*
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* Unable to map control registers, punt,
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* but don't bother issuing a warning.
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*/
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return;
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}
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reg8 = bus_space_read_1(sc->sc_st, sc->sc_sh,
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I82802_RNG_HWST);
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if ((reg8 & I82802_RNG_HWST_PRESENT) == 0) {
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/*
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* Random number generator is not present.
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*/
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bus_space_unmap(sc->sc_st, sc->sc_sh, I82802_IOSIZE);
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return;
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}
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/* Enable the RNG. */
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bus_space_write_1(sc->sc_st, sc->sc_sh,
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I82802_RNG_HWST, reg8 | I82802_RNG_HWST_ENABLE);
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reg8 = bus_space_read_1(sc->sc_st, sc->sc_sh, I82802_RNG_HWST);
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if ((reg8 & I82802_RNG_HWST_ENABLE) == 0) {
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/*
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* Couldn't enable the RNG.
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*/
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bus_space_unmap(sc->sc_st, sc->sc_sh, I82802_IOSIZE);
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return;
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}
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/* Check to see if we can read data from the RNG. */
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count_ff = 0;
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for (j = 0; j < PCHB_RNG_MIN_SAMPLES; ++j) {
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for (i = 0; i < PCHB_RNG_RETRIES; i++) {
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reg8 = bus_space_read_1(sc->sc_st, sc->sc_sh,
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I82802_RNG_RNGST);
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if (!(reg8 & I82802_RNG_RNGST_DATAV)) {
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delay(10);
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continue;
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}
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reg8 = bus_space_read_1(sc->sc_st, sc->sc_sh,
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I82802_RNG_DATA);
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break;
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}
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if (i == PCHB_RNG_RETRIES) {
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bus_space_unmap(sc->sc_st, sc->sc_sh, I82802_IOSIZE);
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aprint_verbose_dev(sc->sc_dev,
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"timeout reading test samples, RNG disabled.\n");
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return;
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}
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if (reg8 == 0xff)
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++count_ff;
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}
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if (count_ff == PCHB_RNG_MIN_SAMPLES) {
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bus_space_unmap(sc->sc_st, sc->sc_sh, I82802_IOSIZE);
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aprint_verbose_dev(sc->sc_dev,
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"returns constant 0xff stream, RNG disabled.\n");
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return;
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}
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/*
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* Should test entropy source to ensure
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* that it passes the Statistical Random
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* Number Generator Tests in section 4.11.1,
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* FIPS PUB 140-1.
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*
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* http://csrc.nist.gov/fips/fips1401.htm
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*/
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aprint_normal_dev(sc->sc_dev, "random number generator enabled\n");
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callout_init(&sc->sc_rnd_ch, 0);
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/* pch is polled for entropy, so no estimate is available. */
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rnd_attach_source(&sc->sc_rnd_source, device_xname(sc->sc_dev),
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RND_TYPE_RNG, RND_FLAG_NO_ESTIMATE);
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sc->sc_rnd_i = sizeof(sc->sc_rnd_ax);
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pchb_rnd_callout(sc);
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sc->sc_rnd_attached = true;
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}
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static void
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pchb_rnd_callout(void *v)
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{
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struct pchb_softc *sc = v;
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if ((bus_space_read_1(sc->sc_st, sc->sc_sh, I82802_RNG_RNGST) &
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I82802_RNG_RNGST_DATAV) != 0) {
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sc->sc_rnd_ax = (sc->sc_rnd_ax << NBBY) |
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bus_space_read_1(sc->sc_st, sc->sc_sh, I82802_RNG_DATA);
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if (--sc->sc_rnd_i == 0) {
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sc->sc_rnd_i = sizeof(sc->sc_rnd_ax);
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rnd_add_data(&sc->sc_rnd_source, &sc->sc_rnd_ax,
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sizeof(sc->sc_rnd_ax),
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sizeof(sc->sc_rnd_ax) * NBBY);
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}
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}
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callout_reset(&sc->sc_rnd_ch, 1, pchb_rnd_callout, sc);
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}
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