Merge ^/head r352308 through r352318.

lib/geom/nop/geom_nop.c

@@ -43,6 +43,7 @@ uint32_t version = G_NOP_VERSION;
 struct g_command class_commands[] = {
 	{ "create", G_FLAG_VERBOSE | G_FLAG_LOADKLD, NULL,
 	    {
+		{ 'c', "count_until_fail", "-1", G_TYPE_NUMBER },
 		{ 'd', "delaymsec", "-1", G_TYPE_NUMBER },
 		{ 'e', "error", "-1", G_TYPE_NUMBER },
 		{ 'o', "offset", "0", G_TYPE_NUMBER },
@@ -57,12 +58,14 @@ struct g_command class_commands[] = {
 		{ 'z', "physpath", G_NOP_PHYSPATH_PASSTHROUGH, G_TYPE_STRING },
 		G_OPT_SENTINEL
 	    },
-	    "[-v] [-d delaymsec] [-e error] [-o offset] [-p stripesize] "
-	    "[-P stripeoffset] [-q rdelayprob] [-r rfailprob] [-s size] "
-	    "[-S secsize] [-w wfailprob] [-x wdelayprob] [-z physpath] dev ..."
+	    "[-v] [-c count_until_fail] [-d delaymsec] [-e error] [-o offset] "
+	    "[-p stripesize] [-P stripeoffset] [-q rdelayprob] [-r rfailprob] "
+	    "[-s size]  [-S secsize] [-w wfailprob] [-x wdelayprob] "
+	    "[-z physpath] dev ..."
 	},
 	{ "configure", G_FLAG_VERBOSE, NULL,
 	    {
+		{ 'c', "count_until_fail", "-1", G_TYPE_NUMBER },
 		{ 'd', "delaymsec", "-1", G_TYPE_NUMBER },
 		{ 'e', "error", "-1", G_TYPE_NUMBER },
 		{ 'q', "rdelayprob", "-1", G_TYPE_NUMBER },
@@ -71,8 +74,9 @@ struct g_command class_commands[] = {
 		{ 'x', "wdelayprob", "-1", G_TYPE_NUMBER },
 		G_OPT_SENTINEL
 	    },
-	    "[-v] [-d delaymsec] [-e error] [-q rdelayprob] [-r rfailprob] "
-	    "[-w wfailprob] [-x wdelayprob] prov ..."
+	    "[-v] [-c count_until_fail] [-d delaymsec] [-e error] "
+	    "[-q rdelayprob] [-r rfailprob] [-w wfailprob] [-x wdelayprob] "
+	    "prov ..."
 	},
 	{ "destroy", G_FLAG_VERBOSE, NULL,
 	    {

lib/geom/nop/gnop.8

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 31, 2019
+.Dd September 13, 2019
 .Dt GNOP 8
 .Os
 .Sh NAME
@@ -34,6 +34,7 @@
 .Nm
 .Cm create
 .Op Fl v
+.Op Fl c Ar count_until_fail
 .Op Fl d Ar delaymsec
 .Op Fl e Ar error
 .Op Fl o Ar offset
@@ -50,6 +51,7 @@
 .Nm
 .Cm configure
 .Op Fl v
+.Op Fl c Ar count_until_fail
 .Op Fl d Ar delaymsec
 .Op Fl e Ar error
 .Op Fl q Ar rdelayprob
@@ -118,7 +120,10 @@ See
 .El
 .Pp
 Additional options:
-.Bl -tag -width ".Fl r Ar rfailprob"
+.Bl -tag -width "-c count_until_fail"
+.It Fl c Ar count_until_fail
+Specifies the number of I/O requests to allow before setting the read and write
+failure probabilities to 100%.
 .It Fl d Ar delaymsec
 Specifies the delay of the requests in milliseconds.
 Note that requests will be delayed before they are sent to the backing device.

lib/libc/locale/big5.5

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 7, 2003
+.Dd September 12, 2019
 .Dt BIG5 5
 .Os
 .Sh NAME
@@ -37,7 +37,7 @@ encoding for Traditional Chinese text
 .Qq BIG5
 .Sh DESCRIPTION
 .Dq Big Five
-is the de facto standard for encoding Traditional Chinese text.
+is a standard for encoding Traditional Chinese text.
 Each character is represented by either one or two bytes.
 Characters from the
 .Tn ASCII
@@ -49,3 +49,10 @@ the first in the range 0xA1 - 0xFE, the second in the range
 .Xr euc 5 ,
 .Xr gb18030 5 ,
 .Xr utf8 5
+.Sh BUGS
+The range of the second byte overlaps some ASCII characters, including
+0x5C (`\\') and 0x7C (`|') which may cause problems in program execution or
+display.
+Big5 is considered a legacy standard and only preserved for backward
+compatibility reason.
+New documents and systems are suggested using UTF-8 directly.

stand/lua/cli.lua

@@ -125,6 +125,10 @@ cli['boot-conf'] = function(...)
 	core.autoboot(argstr)
 end
 
+cli['reload-conf'] = function(...)
+	config.reload()
+end
+
 -- Used for splitting cli varargs into cmd_name and the rest of argv
 function cli.arguments(...)
 	local argv = {...}

stand/lua/cli.lua.8

@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 31, 2018
+.Dd September 13, 2019
 .Dt CLI.LUA 8
 .Os
 .Sh NAME
@@ -82,14 +82,27 @@ As of present, the
 module by default provides commands for
 .Ic autoboot ,
 .Ic boot ,
+.Ic boot-conf ,
 and
-.Ic boot-conf.
-In all three cases, the
+.Ic reload-conf .
+.Pp
+For
+.Ic autoboot ,
+.Ic boot ,
+and
+.Ic boot-conf ,
+the
 .Xr core.lua 8
 module will load all ELF modules as-needed before executing the equivalent
 built-in loader commands.
 All non-kernel arguments to these commands are passed in the same order to the
 loader command.
+.Pp
+The
+.Ic reload-conf
+command will reload the configuration from disk.
+This is useful if you have manually changed currdev and would like to easily
+reload the configuration from the new device.
 .Ss Exported Functions
 The following functions are exported from
 .Nm :

sys/conf/files.powerpc

@@ -192,6 +192,7 @@ powerpc/powernv/opal_flash.c	optional	powernv opalflash
 powerpc/powernv/opal_hmi.c	optional	powernv
 powerpc/powernv/opal_i2c.c	optional	iicbus fdt powernv
 powerpc/powernv/opal_i2cm.c	optional	iicbus fdt powernv
+powerpc/powernv/opal_nvram.c	optional	powernv nvram
 powerpc/powernv/opal_pci.c	optional	powernv pci
 powerpc/powernv/opal_sensor.c	optional	powernv
 powerpc/powernv/opalcall.S	optional	powernv

sys/geom/nop/g_nop.c

@@ -195,6 +195,10 @@ g_nop_start(struct bio *bp)
 
 	G_NOP_LOGREQ(bp, "Request received.");
 	mtx_lock(&sc->sc_lock);
+	if (sc->sc_count_until_fail != 0 && --sc->sc_count_until_fail == 0) {
+		sc->sc_rfailprob = 100;
+		sc->sc_wfailprob = 100;
+	}
 	switch (bp->bio_cmd) {
 	case BIO_READ:
 		sc->sc_reads++;
@@ -308,9 +312,10 @@ g_nop_access(struct g_provider *pp, int dr, int dw, int de)
 
 static int
 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
-    int ioerror, u_int rfailprob, u_int wfailprob, u_int delaymsec, u_int rdelayprob,
-    u_int wdelayprob, off_t offset, off_t size, u_int secsize, off_t stripesize,
-    off_t stripeoffset, const char *physpath)
+    int ioerror, u_int count_until_fail, u_int rfailprob, u_int wfailprob,
+    u_int delaymsec, u_int rdelayprob, u_int wdelayprob, off_t offset,
+    off_t size, u_int secsize, off_t stripesize, off_t stripeoffset,
+    const char *physpath)
 {
 	struct g_nop_softc *sc;
 	struct g_geom *gp;
@@ -386,6 +391,7 @@ g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
 	} else
 		sc->sc_physpath = NULL;
 	sc->sc_error = ioerror;
+	sc->sc_count_until_fail = count_until_fail;
 	sc->sc_rfailprob = rfailprob;
 	sc->sc_wfailprob = wfailprob;
 	sc->sc_delaymsec = delaymsec;
@@ -491,8 +497,9 @@ static void
 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
 {
 	struct g_provider *pp;
-	intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size,
-	    *stripesize, *stripeoffset, *delaymsec, *rdelayprob, *wdelayprob;
+	intmax_t *error, *rfailprob, *wfailprob, *count_until_fail, *offset,
+	    *secsize, *size, *stripesize, *stripeoffset, *delaymsec,
+	    *rdelayprob, *wdelayprob;
 	const char *name, *physpath;
 	char param[16];
 	int i, *nargs;
@@ -558,6 +565,16 @@ g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
 		gctl_error(req, "Invalid '%s' argument", "wdelayprob");
 		return;
 	}
+	count_until_fail = gctl_get_paraml(req, "count_until_fail",
+	    sizeof(*count_until_fail));
+	if (count_until_fail == NULL) {
+		gctl_error(req, "No '%s' argument", "count_until_fail");
+		return;
+	}
+	if (*count_until_fail < -1) {
+		gctl_error(req, "Invalid '%s' argument", "count_until_fail");
+		return;
+	}
 	offset = gctl_get_paraml(req, "offset", sizeof(*offset));
 	if (offset == NULL) {
 		gctl_error(req, "No '%s' argument", "offset");
@@ -622,6 +639,7 @@ g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
 		}
 		if (g_nop_create(req, mp, pp,
 		    *error == -1 ? EIO : (int)*error,
+		    *count_until_fail == -1 ? 0 : (u_int)*count_until_fail,
 		    *rfailprob == -1 ? 0 : (u_int)*rfailprob,
 		    *wfailprob == -1 ? 0 : (u_int)*wfailprob,
 		    *delaymsec == -1 ? 1 : (u_int)*delaymsec,
@@ -640,7 +658,8 @@ g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
 {
 	struct g_nop_softc *sc;
 	struct g_provider *pp;
-	intmax_t *delaymsec, *error, *rdelayprob, *rfailprob, *wdelayprob, *wfailprob;
+	intmax_t *delaymsec, *error, *rdelayprob, *rfailprob, *wdelayprob,
+	    *wfailprob, *count_until_fail;
 	const char *name;
 	char param[16];
 	int i, *nargs;
@@ -661,6 +680,12 @@ g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
 		gctl_error(req, "No '%s' argument", "error");
 		return;
 	}
+	count_until_fail = gctl_get_paraml(req, "count_until_fail",
+	    sizeof(*count_until_fail));
+	if (count_until_fail == NULL) {
+		gctl_error(req, "No '%s' argument", "count_until_fail");
+		return;
+	}
 	rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob));
 	if (rfailprob == NULL) {
 		gctl_error(req, "No '%s' argument", "rfailprob");
@@ -736,6 +761,8 @@ g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
 			sc->sc_wdelayprob = (u_int)*wdelayprob;
 		if (*delaymsec != -1)
 			sc->sc_delaymsec = (u_int)*delaymsec;
+		if (*count_until_fail != -1)
+			sc->sc_count_until_fail = (u_int)*count_until_fail;
 	}
 }
 
@@ -904,6 +931,8 @@ g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 	sbuf_printf(sb, "%s<WriteDelayedProb>%u</WriteDelayedProb>\n", indent,
 	    sc->sc_wdelayprob);
 	sbuf_printf(sb, "%s<Delay>%d</Delay>\n", indent, sc->sc_delaymsec);
+	sbuf_printf(sb, "%s<CountUntilFail>%u</CountUntilFail>\n", indent,
+	    sc->sc_count_until_fail);
 	sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error);
 	sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads);
 	sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes);

sys/geom/nop/g_nop.h

@@ -62,6 +62,7 @@ struct g_nop_softc {
 	u_int			 sc_delaymsec;
 	u_int			 sc_rdelayprob;
 	u_int			 sc_wdelayprob;
+	u_int			 sc_count_until_fail;
 	uintmax_t		 sc_reads;
 	uintmax_t		 sc_writes;
 	uintmax_t		 sc_deletes;

sys/modules/Makefile

@@ -762,10 +762,11 @@ _wi=		wi
 
 .if ${MACHINE_ARCH} == "powerpc64"
 _ipmi=		ipmi
+_nvram=		opal_nvram
 .endif
 .if ${MACHINE_ARCH} == "powerpc64" || ${MACHINE_ARCH} == "powerpc"
 # Don't build powermac_nvram for powerpcspe, it's never supported.
-_nvram=		powermac_nvram
+_nvram+=	powermac_nvram
 .endif
 
 .if ${MACHINE_CPUARCH} == "sparc64"

sys/modules/opal_nvram/Makefile

@@ -0,0 +1,10 @@
+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/powerpc/powernv
+
+KMOD=	opal_nvram
+SRCS=	opal_nvram.c
+SRCS+=	bus_if.h device_if.h
+SRCS+=	ofw_bus_if.h
+
+.include <bsd.kmod.mk>

sys/netpfil/ipfw/ip_fw2.c

@@ -1448,7 +1448,10 @@ ipfw_chk(struct ip_fw_args *args)
 do {								\
 	int x = (_len) + T + EHLEN;				\
 	if (mem) {						\
-		MPASS(pktlen >= x);				\
+		if (__predict_false(pktlen < x)) {		\
+			unlock;					\
+			goto pullup_failed;			\
+		}						\
 		p = (char *)args->mem + (_len) + EHLEN;		\
 	} else {						\
 		if (__predict_false((m)->m_len < x)) {		\

sys/powerpc/powernv/opal.h

@@ -45,6 +45,8 @@ int opal_call(uint64_t token, ...);
 #define OPAL_RTC_WRITE			4
 #define	OPAL_CEC_POWER_DOWN		5
 #define	OPAL_CEC_REBOOT			6
+#define	OPAL_READ_NVRAM			7
+#define	OPAL_WRITE_NVRAM		8
 #define	OPAL_HANDLE_INTERRUPT		9
 #define	OPAL_POLL_EVENTS		10
 #define	OPAL_PCI_CONFIG_READ_BYTE	13

sys/powerpc/powernv/opal_hmi.c

@@ -81,6 +81,26 @@ opal_hmi_event_handler(void *unused, struct opal_msg *msg)
 	return;
 }
 
+static int
+opal_hmi_handler2(struct trapframe *frame)
+{
+	uint64_t flags;
+	int err;
+
+	flags = 0;
+	err = opal_call(OPAL_HANDLE_HMI2, vtophys(&flags));
+
+	if (flags & OPAL_HMI_FLAGS_TOD_TB_FAIL)
+		panic("TOD/TB recovery failure");
+
+	if (err == OPAL_SUCCESS)
+		return (0);
+
+	printf("HMI handler failed!  OPAL error code: %d\n", err);
+
+	return (-1);
+}
+
 static int
 opal_hmi_handler(struct trapframe *frame)
 {
@@ -88,10 +108,8 @@ opal_hmi_handler(struct trapframe *frame)
 
 	err = opal_call(OPAL_HANDLE_HMI);
 
-	if (err == OPAL_SUCCESS) {
-		mtspr(SPR_HMER, 0);
+	if (err == OPAL_SUCCESS)
 		return (0);
-	}
 
 	printf("HMI handler failed!  OPAL error code: %d\n", err);
 
@@ -105,7 +123,9 @@ opal_setup_hmi(void *data)
 	if (opal_check() != 0)
 		return;
 
-	if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT)
+	if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI2) == OPAL_TOKEN_PRESENT)
+		hmi_handler = opal_hmi_handler2;
+	else if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT)
 		hmi_handler = opal_hmi_handler;
 	else {
 		printf("Warning: No OPAL HMI handler found.\n");

sys/powerpc/powernv/opal_nvram.c

@@ -0,0 +1,276 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Justin Hibbits
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/disk.h>
+#include <sys/kernel.h>
+#include <sys/uio.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <machine/bus.h>
+#include <machine/md_var.h>
+#include <machine/pio.h>
+#include <machine/resource.h>
+
+#include "opal.h"
+
+#include <sys/rman.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#define	NVRAM_BUFSIZE	(65536)	/* 64k blocks */
+
+struct opal_nvram_softc {
+	device_t	 sc_dev;
+	uint32_t	 sc_size;
+	uint8_t		*sc_buf;
+	vm_paddr_t	 sc_buf_phys;
+
+	struct cdev 	*sc_cdev;
+	int		 sc_isopen;
+};
+
+/*
+ * Device interface.
+ */
+static int		opal_nvram_probe(device_t);
+static int		opal_nvram_attach(device_t);
+static int		opal_nvram_detach(device_t);
+
+/*
+ * Driver methods.
+ */
+static device_method_t	opal_nvram_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		opal_nvram_probe),
+	DEVMETHOD(device_attach,	opal_nvram_attach),
+	DEVMETHOD(device_detach,	opal_nvram_detach),
+
+	{ 0, 0 }
+};
+
+static driver_t	opal_nvram_driver = {
+	"opal_nvram",
+	opal_nvram_methods,
+	sizeof(struct opal_nvram_softc)
+};
+
+static devclass_t opal_nvram_devclass;
+
+DRIVER_MODULE(opal_nvram, opal, opal_nvram_driver, opal_nvram_devclass, 0, 0);
+
+/*
+ * Cdev methods.
+ */
+
+static	d_open_t	opal_nvram_open;
+static	d_close_t	opal_nvram_close;
+static	d_read_t	opal_nvram_read;
+static	d_write_t	opal_nvram_write;
+static	d_ioctl_t	opal_nvram_ioctl;
+
+static struct cdevsw opal_nvram_cdevsw = {
+	.d_version =	D_VERSION,
+	.d_flags =	D_NEEDGIANT,
+	.d_open =	opal_nvram_open,
+	.d_close =	opal_nvram_close,
+	.d_read =	opal_nvram_read,
+	.d_write =	opal_nvram_write,
+	.d_ioctl =	opal_nvram_ioctl,
+	.d_name =	"nvram",
+};
+
+static int
+opal_nvram_probe(device_t dev)
+{
+
+	if (!ofw_bus_is_compatible(dev, "ibm,opal-nvram"))
+		return (ENXIO);
+
+	device_set_desc(dev, "OPAL NVRAM");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+opal_nvram_attach(device_t dev)
+{
+	struct opal_nvram_softc *sc;
+	phandle_t node;
+	int err;
+
+	node = ofw_bus_get_node(dev);
+	sc = device_get_softc(dev);
+
+	sc->sc_dev = dev;
+
+	err = OF_getencprop(node, "#bytes", &sc->sc_size,
+	    sizeof(sc->sc_size));
+
+	if (err < 0)
+		return (ENXIO);
+
+	sc->sc_buf = contigmalloc(NVRAM_BUFSIZE, M_DEVBUF, M_WAITOK,
+	    0, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
+	if (sc->sc_buf == NULL) {
+		device_printf(dev, "No memory for buffer.\n");
+		return (ENXIO);
+	}
+	sc->sc_buf_phys = pmap_kextract((vm_offset_t)sc->sc_buf);
+	sc->sc_cdev = make_dev(&opal_nvram_cdevsw, 0, 0, 0, 0600,
+	    "nvram");
+	sc->sc_cdev->si_drv1 = sc;
+
+	return (0);
+}
+
+static int
+opal_nvram_detach(device_t dev)
+{
+	struct opal_nvram_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	if (sc->sc_cdev != NULL)
+		destroy_dev(sc->sc_cdev);
+	if (sc->sc_buf != NULL)
+		contigfree(sc->sc_buf, NVRAM_BUFSIZE, M_DEVBUF);
+	
+	return (0);
+}
+
+static int
+opal_nvram_open(struct cdev *dev, int flags, int fmt, struct thread *td)
+{
+	struct opal_nvram_softc *sc = dev->si_drv1;
+
+	if (sc->sc_isopen)
+		return EBUSY;
+	sc->sc_isopen = 1;
+	return (0);
+}
+
+static int
+opal_nvram_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
+{
+	struct opal_nvram_softc *sc = dev->si_drv1;
+
+	sc->sc_isopen = 0;
+	return (0);
+}
+
+static int
+opal_nvram_read(struct cdev *dev, struct uio *uio, int ioflag)
+{
+	struct opal_nvram_softc *sc = dev->si_drv1;
+	int rv, amnt;
+
+	rv = 0;
+	while (uio->uio_resid > 0) {
+		amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
+		amnt = MIN(amnt, NVRAM_BUFSIZE);
+		if (amnt == 0)
+			break;
+
+		rv = opal_call(OPAL_READ_NVRAM, sc->sc_buf_phys,
+		    amnt, uio->uio_offset);
+		if (rv != OPAL_SUCCESS) {
+			switch (rv) {
+			case OPAL_HARDWARE:
+				rv = EIO;
+				break;
+			case OPAL_PARAMETER:
+				rv = EINVAL;
+				break;
+			}
+			break;
+		}
+		rv = uiomove(sc->sc_buf, amnt, uio);
+		if (rv != 0)
+			break;
+	}
+	return (rv);
+}
+
+static int
+opal_nvram_write(struct cdev *dev, struct uio *uio, int ioflag)
+{
+	off_t offset;
+	int rv, amnt;
+	struct opal_nvram_softc *sc = dev->si_drv1;
+
+	rv = 0;
+	while (uio->uio_resid > 0) {
+		amnt = MIN(uio->uio_resid, sc->sc_size - uio->uio_offset);
+		amnt = MIN(amnt, NVRAM_BUFSIZE);
+		if (amnt == 0) {
+			rv = ENOSPC;
+			break;
+		}
+		offset = uio->uio_offset;
+		rv = uiomove(sc->sc_buf, amnt, uio);
+		if (rv != 0)
+			break;
+		rv = opal_call(OPAL_WRITE_NVRAM, sc->sc_buf_phys, amnt,
+		    offset);
+		if (rv != OPAL_SUCCESS) {
+			switch (rv) {
+			case OPAL_HARDWARE:
+				rv = EIO;
+				break;
+			case OPAL_PARAMETER:
+				rv = EINVAL;
+				break;
+			}
+			break;
+		}
+	}
+	return (rv);
+}
+
+static int
+opal_nvram_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
+    struct thread *td)
+{
+	struct opal_nvram_softc *sc = dev->si_drv1;
+
+	switch (cmd) {
+	case DIOCGMEDIASIZE:
+		*(off_t *)data = sc->sc_size;
+		return (0);
+	}
+	return (EINVAL);
+}