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Index: head/sys/conf/files.powerpc
===================================================================
--- head/sys/conf/files.powerpc
+++ head/sys/conf/files.powerpc
@@ -63,6 +63,7 @@
dev/ofw/ofw_subr.c standard
dev/powermac_nvram/powermac_nvram.c optional powermac_nvram powermac
dev/quicc/quicc_bfe_fdt.c optional quicc mpc85xx
+dev/random/darn.c optional powerpc64 random
dev/scc/scc_bfe_macio.c optional scc powermac
dev/sdhci/fsl_sdhci.c optional mpc85xx sdhci
dev/sec/sec.c optional sec mpc85xx
Index: head/sys/dev/random/darn.c
===================================================================
--- head/sys/dev/random/darn.c
+++ head/sys/dev/random/darn.c
@@ -0,0 +1,142 @@
+/*-
+ * Copyright (c) 2018 Justin Hibbits
+ * Copyright (c) 2013 The FreeBSD Foundation
+ * Copyright (c) 2013 David E. O'Brien <obrien@NUXI.org>
+ * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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
+ * in this position and unchanged.
+ * 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.
+ *
+ * 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 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 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/conf.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/random.h>
+#include <sys/systm.h>
+
+#include <machine/cpu.h>
+#include <machine/md_var.h>
+
+#include <dev/random/randomdev.h>
+
+/*
+ * Power ISA 3.0 adds a "darn" instruction (Deliver A Random Number). The RNG
+ * backing this instruction conforms to NIST SP800-90B and SP800-90C at the
+ * point of hardware design, and provides a minimum of 0.5 bits of entropy per
+ * bit.
+ */
+
+#define RETRY_COUNT 10
+
+static u_int random_darn_read(void *, u_int);
+
+static struct random_source random_darn = {
+ .rs_ident = "PowerISA DARN random number generator",
+ .rs_source = RANDOM_PURE_DARN,
+ .rs_read = random_darn_read
+};
+
+static inline int
+darn_rng_store(u_long *buf)
+{
+ u_long rndval;
+ int retry;
+
+ for (retry = RETRY_COUNT; retry > 0; --retry) {
+ /* "DARN %rN, 1" instruction */
+ /*
+ * Arguments for DARN: rN and "L", where "L" can be one of:
+ * 0 - 32-bit conditional random number
+ * 1 - Conditional random number (conditioned to remove bias)
+ * 2 - Raw random number (unprocessed, may include bias)
+ * 3 - Reserved
+ */
+ __asm __volatile(".long 0x7c0105e6 | (%0 << 21)" :
+ "+r"(rndval));
+ if (rndval != ~0)
+ break;
+ }
+
+ *buf = rndval;
+ return (retry);
+}
+
+/* It is required that buf length is a multiple of sizeof(u_long). */
+static u_int
+random_darn_read(void *buf, u_int c)
+{
+ u_long *b, rndval;
+ u_int count;
+
+ KASSERT(c % sizeof(*b) == 0, ("partial read %d", c));
+ b = buf;
+ for (count = c; count > 0; count -= sizeof(*b)) {
+ if (darn_rng_store(&rndval) == 0)
+ break;
+ *b++ = rndval;
+ }
+ return (c - count);
+}
+
+static int
+darn_modevent(module_t mod, int type, void *unused)
+{
+ int error = 0;
+
+ switch (type) {
+ case MOD_LOAD:
+ if (cpu_features2 & PPC_FEATURE2_DARN) {
+ random_source_register(&random_darn);
+ printf("random: fast provider: \"%s\"\n", random_darn.rs_ident);
+ }
+ break;
+
+ case MOD_UNLOAD:
+ if (cpu_features2 & PPC_FEATURE2_DARN)
+ random_source_deregister(&random_darn);
+ break;
+
+ case MOD_SHUTDOWN:
+ break;
+
+ default:
+ error = EOPNOTSUPP;
+ break;
+
+ }
+
+ return (error);
+}
+
+DEV_MODULE(darn, darn_modevent, NULL);
+MODULE_VERSION(darn, 1);
+MODULE_DEPEND(darn, random_device, 1, 1, 1);
Index: head/sys/dev/random/random_harvestq.c
===================================================================
--- head/sys/dev/random/random_harvestq.c
+++ head/sys/dev/random/random_harvestq.c
@@ -307,6 +307,7 @@
[RANDOM_PURE_VIRTIO] = "PURE_VIRTIO",
[RANDOM_PURE_BROADCOM] = "PURE_BROADCOM",
[RANDOM_PURE_CCP] = "PURE_CCP",
+ [RANDOM_PURE_DARN] = "PURE_DARN",
/* "ENTROPYSOURCE" */
};
Index: head/sys/sys/random.h
===================================================================
--- head/sys/sys/random.h
+++ head/sys/sys/random.h
@@ -95,6 +95,7 @@
RANDOM_PURE_VIRTIO,
RANDOM_PURE_BROADCOM,
RANDOM_PURE_CCP,
+ RANDOM_PURE_DARN,
ENTROPYSOURCE
};

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