FDT(4): Import from FreeBSD

1 files changed, 807 insertions, 0 deletions

diff --git a/freebsd/sys/dev/ofw/openfirm.c b/freebsd/sys/dev/ofw/openfirm.c
new file mode 100644
index 00000000..6c6cd874
--- /dev/null
+++ b/freebsd/sys/dev/ofw/openfirm.c
@@ -0,0 +1,807 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*	$NetBSD: Locore.c,v 1.7 2000/08/20 07:04:59 tsubai Exp $	*/
+
+/*-
+ * Copyright (C) 1995, 1996 Wolfgang Solfrank.
+ * Copyright (C) 1995, 1996 TooLs GmbH.
+ * 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 TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
+ */
+/*-
+ * Copyright (C) 2000 Benno Rice.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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 <rtems/bsd/local/opt_platform.h>
+
+#include <rtems/bsd/sys/param.h>
+#include <sys/kernel.h>
+#include <rtems/bsd/sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/queue.h>
+#include <sys/systm.h>
+#include <sys/endian.h>
+
+#include <machine/stdarg.h>
+
+#include <dev/ofw/ofwvar.h>
+#include <dev/ofw/openfirm.h>
+
+#include <rtems/bsd/local/ofw_if.h>
+
+static void OF_putchar(int c, void *arg);
+
+MALLOC_DEFINE(M_OFWPROP, "openfirm", "Open Firmware properties");
+
+static ihandle_t stdout;
+
+static ofw_def_t	*ofw_def_impl = NULL;
+static ofw_t		ofw_obj;
+static struct ofw_kobj	ofw_kernel_obj;
+static struct kobj_ops	ofw_kernel_kops;
+
+struct xrefinfo {
+	phandle_t	xref;
+	phandle_t 	node;
+	device_t  	dev;
+	SLIST_ENTRY(xrefinfo) next_entry;
+};
+
+static SLIST_HEAD(, xrefinfo) xreflist = SLIST_HEAD_INITIALIZER(xreflist);
+static struct mtx xreflist_lock;
+static boolean_t xref_init_done;
+
+#define	FIND_BY_XREF	0
+#define	FIND_BY_NODE	1
+#define	FIND_BY_DEV	2
+
+/*
+ * xref-phandle-device lookup helper routines.
+ *
+ * As soon as we are able to use malloc(), walk the node tree and build a list
+ * of info that cross-references node handles, xref handles, and device_t
+ * instances.  This list exists primarily to allow association of a device_t
+ * with an xref handle, but it is also used to speed up translation between xref
+ * and node handles.  Before malloc() is available we have to recursively search
+ * the node tree each time we want to translate between a node and xref handle.
+ * Afterwards we can do the translations by searching this much shorter list.
+ */
+static void
+xrefinfo_create(phandle_t node)
+{
+	struct xrefinfo * xi;
+	phandle_t child, xref;
+
+	/*
+	 * Recursively descend from parent, looking for nodes with a property
+	 * named either "phandle", "ibm,phandle", or "linux,phandle".  For each
+	 * such node found create an entry in the xreflist.
+	 */
+	for (child = OF_child(node); child != 0; child = OF_peer(child)) {
+		xrefinfo_create(child);
+		if (OF_getencprop(child, "phandle", &xref, sizeof(xref)) ==
+		    -1 && OF_getencprop(child, "ibm,phandle", &xref,
+		    sizeof(xref)) == -1 && OF_getencprop(child,
+		    "linux,phandle", &xref, sizeof(xref)) == -1)
+			continue;
+		xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK | M_ZERO);
+		xi->node = child;
+		xi->xref = xref;
+		SLIST_INSERT_HEAD(&xreflist, xi, next_entry);
+	}
+}
+
+static void
+xrefinfo_init(void *unsed)
+{
+
+	/*
+	 * There is no locking during this init because it runs much earlier
+	 * than any of the clients/consumers of the xref list data, but we do
+	 * initialize the mutex that will be used for access later.
+	 */
+	mtx_init(&xreflist_lock, "OF xreflist lock", NULL, MTX_DEF);
+	xrefinfo_create(OF_peer(0));
+	xref_init_done = true;
+}
+SYSINIT(xrefinfo, SI_SUB_KMEM, SI_ORDER_ANY, xrefinfo_init, NULL);
+
+static struct xrefinfo *
+xrefinfo_find(uintptr_t key, int find_by)
+{
+	struct xrefinfo *rv, *xi;
+
+	rv = NULL;
+	mtx_lock(&xreflist_lock);
+	SLIST_FOREACH(xi, &xreflist, next_entry) {
+		if ((find_by == FIND_BY_XREF && (phandle_t)key == xi->xref) ||
+		    (find_by == FIND_BY_NODE && (phandle_t)key == xi->node) ||
+		    (find_by == FIND_BY_DEV && key == (uintptr_t)xi->dev)) {
+			rv = xi;
+			break;
+		}
+	}
+	mtx_unlock(&xreflist_lock);
+	return (rv);
+}
+
+static struct xrefinfo *
+xrefinfo_add(phandle_t node, phandle_t xref, device_t dev)
+{
+	struct xrefinfo *xi;
+
+	xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK);
+	xi->node = node;
+	xi->xref = xref;
+	xi->dev  = dev;
+	mtx_lock(&xreflist_lock);
+	SLIST_INSERT_HEAD(&xreflist, xi, next_entry);
+	mtx_unlock(&xreflist_lock);
+	return (xi);
+}
+
+/*
+ * OFW install routines.  Highest priority wins, equal priority also
+ * overrides allowing last-set to win.
+ */
+SET_DECLARE(ofw_set, ofw_def_t);
+
+boolean_t
+OF_install(char *name, int prio)
+{
+	ofw_def_t *ofwp, **ofwpp;
+	static int curr_prio = 0;
+
+	/*
+	 * Try and locate the OFW kobj corresponding to the name.
+	 */
+	SET_FOREACH(ofwpp, ofw_set) {
+		ofwp = *ofwpp;
+
+		if (ofwp->name &&
+		    !strcmp(ofwp->name, name) &&
+		    prio >= curr_prio) {
+			curr_prio = prio;
+			ofw_def_impl = ofwp;
+			return (TRUE);
+		}
+	}
+
+	return (FALSE);
+}
+
+/* Initializer */
+int
+OF_init(void *cookie)
+{
+	phandle_t chosen;
+	int rv;
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	ofw_obj = &ofw_kernel_obj;
+	/*
+	 * Take care of compiling the selected class, and
+	 * then statically initialize the OFW object.
+	 */
+	kobj_class_compile_static(ofw_def_impl, &ofw_kernel_kops);
+	kobj_init_static((kobj_t)ofw_obj, ofw_def_impl);
+
+	rv = OFW_INIT(ofw_obj, cookie);
+
+	if ((chosen = OF_finddevice("/chosen")) != -1)
+		if (OF_getencprop(chosen, "stdout", &stdout,
+		    sizeof(stdout)) == -1)
+			stdout = -1;
+
+	return (rv);
+}
+
+static void
+OF_putchar(int c, void *arg __unused)
+{
+	char cbuf;
+
+	if (c == '\n') {
+		cbuf = '\r';
+		OF_write(stdout, &cbuf, 1);
+	}
+
+	cbuf = c;
+	OF_write(stdout, &cbuf, 1);
+}
+
+void
+OF_printf(const char *fmt, ...)
+{
+	va_list	va;
+
+	va_start(va, fmt);
+	(void)kvprintf(fmt, OF_putchar, NULL, 10, va);
+	va_end(va);
+}
+
+/*
+ * Generic functions
+ */
+
+/* Test to see if a service exists. */
+int
+OF_test(const char *name)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_TEST(ofw_obj, name));
+}
+
+int
+OF_interpret(const char *cmd, int nreturns, ...)
+{
+	va_list ap;
+	cell_t slots[16];
+	int i = 0;
+	int status;
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	status = OFW_INTERPRET(ofw_obj, cmd, nreturns, slots);
+	if (status == -1)
+		return (status);
+
+	va_start(ap, nreturns);
+	while (i < nreturns)
+		*va_arg(ap, cell_t *) = slots[i++];
+	va_end(ap);
+
+	return (status);
+}
+
+/*
+ * Device tree functions
+ */
+
+/* Return the next sibling of this node or 0. */
+phandle_t
+OF_peer(phandle_t node)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_PEER(ofw_obj, node));
+}
+
+/* Return the first child of this node or 0. */
+phandle_t
+OF_child(phandle_t node)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_CHILD(ofw_obj, node));
+}
+
+/* Return the parent of this node or 0. */
+phandle_t
+OF_parent(phandle_t node)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_PARENT(ofw_obj, node));
+}
+
+/* Return the package handle that corresponds to an instance handle. */
+phandle_t
+OF_instance_to_package(ihandle_t instance)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_INSTANCE_TO_PACKAGE(ofw_obj, instance));
+}
+
+/* Get the length of a property of a package. */
+ssize_t
+OF_getproplen(phandle_t package, const char *propname)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_GETPROPLEN(ofw_obj, package, propname));
+}
+
+/* Check existence of a property of a package. */
+int
+OF_hasprop(phandle_t package, const char *propname)
+{
+
+	return (OF_getproplen(package, propname) >= 0 ? 1 : 0);
+}
+
+/* Get the value of a property of a package. */
+ssize_t
+OF_getprop(phandle_t package, const char *propname, void *buf, size_t buflen)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_GETPROP(ofw_obj, package, propname, buf, buflen));
+}
+
+ssize_t
+OF_getencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len)
+{
+	ssize_t retval;
+	int i;
+
+	KASSERT(len % 4 == 0, ("Need a multiple of 4 bytes"));
+
+	retval = OF_getprop(node, propname, buf, len);
+	if (retval <= 0)
+		return (retval);
+
+	for (i = 0; i < len/4; i++)
+		buf[i] = be32toh(buf[i]);
+
+	return (retval);
+}
+
+/*
+ * Recursively search the node and its parent for the given property, working
+ * downward from the node to the device tree root.  Returns the value of the
+ * first match.
+ */
+ssize_t
+OF_searchprop(phandle_t node, const char *propname, void *buf, size_t len)
+{
+	ssize_t rv;
+
+	for (; node != 0; node = OF_parent(node))
+		if ((rv = OF_getprop(node, propname, buf, len)) != -1)
+			return (rv);
+	return (-1);
+}
+
+ssize_t
+OF_searchencprop(phandle_t node, const char *propname, void *buf, size_t len)
+{
+	ssize_t rv;
+
+	for (; node != 0; node = OF_parent(node))
+		if ((rv = OF_getencprop(node, propname, buf, len)) != -1)
+			return (rv);
+	return (-1);
+}
+
+/*
+ * Store the value of a property of a package into newly allocated memory
+ * (using the M_OFWPROP malloc pool and M_WAITOK).  elsz is the size of a
+ * single element, the number of elements is return in number.
+ */
+ssize_t
+OF_getprop_alloc(phandle_t package, const char *propname, int elsz, void **buf)
+{
+	int len;
+
+	*buf = NULL;
+	if ((len = OF_getproplen(package, propname)) == -1 ||
+	    len % elsz != 0)
+		return (-1);
+
+	*buf = malloc(len, M_OFWPROP, M_WAITOK);
+	if (OF_getprop(package, propname, *buf, len) == -1) {
+		free(*buf, M_OFWPROP);
+		*buf = NULL;
+		return (-1);
+	}
+	return (len / elsz);
+}
+
+ssize_t
+OF_getencprop_alloc(phandle_t package, const char *name, int elsz, void **buf)
+{
+	ssize_t retval;
+	pcell_t *cell;
+	int i;
+
+	retval = OF_getprop_alloc(package, name, elsz, buf);
+	if (retval == -1)
+		return (-1);
+ 	if (retval * elsz % 4 != 0) {
+		free(*buf, M_OFWPROP);
+		*buf = NULL;
+		return (-1);
+	}
+
+	cell = *buf;
+	for (i = 0; i < retval * elsz / 4; i++)
+		cell[i] = be32toh(cell[i]);
+
+	return (retval);
+}
+
+/* Free buffer allocated by OF_getencprop_alloc or OF_getprop_alloc */
+void OF_prop_free(void *buf)
+{
+
+	free(buf, M_OFWPROP);
+}
+
+/* Get the next property of a package. */
+int
+OF_nextprop(phandle_t package, const char *previous, char *buf, size_t size)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_NEXTPROP(ofw_obj, package, previous, buf, size));
+}
+
+/* Set the value of a property of a package. */
+int
+OF_setprop(phandle_t package, const char *propname, const void *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_SETPROP(ofw_obj, package, propname, buf,len));
+}
+
+/* Convert a device specifier to a fully qualified pathname. */
+ssize_t
+OF_canon(const char *device, char *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_CANON(ofw_obj, device, buf, len));
+}
+
+/* Return a package handle for the specified device. */
+phandle_t
+OF_finddevice(const char *device)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_FINDDEVICE(ofw_obj, device));
+}
+
+/* Return the fully qualified pathname corresponding to an instance. */
+ssize_t
+OF_instance_to_path(ihandle_t instance, char *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_INSTANCE_TO_PATH(ofw_obj, instance, buf, len));
+}
+
+/* Return the fully qualified pathname corresponding to a package. */
+ssize_t
+OF_package_to_path(phandle_t package, char *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_PACKAGE_TO_PATH(ofw_obj, package, buf, len));
+}
+
+/* Look up effective phandle (see FDT/PAPR spec) */
+static phandle_t
+OF_child_xref_phandle(phandle_t parent, phandle_t xref)
+{
+	phandle_t child, rxref;
+
+	/*
+	 * Recursively descend from parent, looking for a node with a property
+	 * named either "phandle", "ibm,phandle", or "linux,phandle" that
+	 * matches the xref we are looking for.
+	 */
+
+	for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
+		rxref = OF_child_xref_phandle(child, xref);
+		if (rxref != -1)
+			return (rxref);
+
+		if (OF_getencprop(child, "phandle", &rxref, sizeof(rxref)) ==
+		    -1 && OF_getencprop(child, "ibm,phandle", &rxref,
+		    sizeof(rxref)) == -1 && OF_getencprop(child,
+		    "linux,phandle", &rxref, sizeof(rxref)) == -1)
+			continue;
+
+		if (rxref == xref)
+			return (child);
+	}
+
+	return (-1);
+}
+
+phandle_t
+OF_node_from_xref(phandle_t xref)
+{
+	struct xrefinfo *xi;
+	phandle_t node;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
+			return (xref);
+		return (xi->node);
+	}
+
+	if ((node = OF_child_xref_phandle(OF_peer(0), xref)) == -1)
+		return (xref);
+	return (node);
+}
+
+phandle_t
+OF_xref_from_node(phandle_t node)
+{
+	struct xrefinfo *xi;
+	phandle_t xref;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(node, FIND_BY_NODE)) == NULL)
+			return (node);
+		return (xi->xref);
+	}
+
+	if (OF_getencprop(node, "phandle", &xref, sizeof(xref)) == -1 &&
+	    OF_getencprop(node, "ibm,phandle", &xref, sizeof(xref)) == -1 &&
+	    OF_getencprop(node, "linux,phandle", &xref, sizeof(xref)) == -1)
+		return (node);
+	return (xref);
+}
+
+device_t
+OF_device_from_xref(phandle_t xref)
+{
+	struct xrefinfo *xi;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
+			return (NULL);
+		return (xi->dev);
+	}
+	panic("Attempt to find device before xreflist_init");
+}
+
+phandle_t
+OF_xref_from_device(device_t dev)
+{
+	struct xrefinfo *xi;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find((uintptr_t)dev, FIND_BY_DEV)) == NULL)
+			return (0);
+		return (xi->xref);
+	}
+	panic("Attempt to find xref before xreflist_init");
+}
+
+int
+OF_device_register_xref(phandle_t xref, device_t dev)
+{
+	struct xrefinfo *xi;
+
+	/*
+	 * If the given xref handle doesn't already exist in the list then we
+	 * add a list entry.  In theory this can only happen on a system where
+	 * nodes don't contain phandle properties and xref and node handles are
+	 * synonymous, so the xref handle is added as the node handle as well.
+	 */
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
+			xrefinfo_add(xref, xref, dev);
+		else 
+			xi->dev = dev;
+		return (0);
+	}
+	panic("Attempt to register device before xreflist_init");
+}
+
+/*  Call the method in the scope of a given instance. */
+int
+OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns,
+    ...)
+{
+	va_list ap;
+	cell_t args_n_results[12];
+	int n, status;
+
+	if (nargs > 6 || ofw_def_impl == NULL)
+		return (-1);
+	va_start(ap, nreturns);
+	for (n = 0; n < nargs; n++)
+		args_n_results[n] = va_arg(ap, cell_t);
+
+	status = OFW_CALL_METHOD(ofw_obj, instance, method, nargs, nreturns,
+	    args_n_results);
+	if (status != 0)
+		return (status);
+
+	for (; n < nargs + nreturns; n++)
+		*va_arg(ap, cell_t *) = args_n_results[n];
+	va_end(ap);
+	return (0);
+}
+
+/*
+ * Device I/O functions
+ */
+
+/* Open an instance for a device. */
+ihandle_t
+OF_open(const char *device)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_OPEN(ofw_obj, device));
+}
+
+/* Close an instance. */
+void
+OF_close(ihandle_t instance)
+{
+
+	if (ofw_def_impl == NULL)
+		return;
+
+	OFW_CLOSE(ofw_obj, instance);
+}
+
+/* Read from an instance. */
+ssize_t
+OF_read(ihandle_t instance, void *addr, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_READ(ofw_obj, instance, addr, len));
+}
+
+/* Write to an instance. */
+ssize_t
+OF_write(ihandle_t instance, const void *addr, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_WRITE(ofw_obj, instance, addr, len));
+}
+
+/* Seek to a position. */
+int
+OF_seek(ihandle_t instance, uint64_t pos)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_SEEK(ofw_obj, instance, pos));
+}
+
+/*
+ * Memory functions
+ */
+
+/* Claim an area of memory. */
+void *
+OF_claim(void *virt, size_t size, u_int align)
+{
+
+	if (ofw_def_impl == NULL)
+		return ((void *)-1);
+
+	return (OFW_CLAIM(ofw_obj, virt, size, align));
+}
+
+/* Release an area of memory. */
+void
+OF_release(void *virt, size_t size)
+{
+
+	if (ofw_def_impl == NULL)
+		return;
+
+	OFW_RELEASE(ofw_obj, virt, size);
+}
+
+/*
+ * Control transfer functions
+ */
+
+/* Suspend and drop back to the Open Firmware interface. */
+void
+OF_enter()
+{
+
+	if (ofw_def_impl == NULL)
+		return;
+
+	OFW_ENTER(ofw_obj);
+}
+
+/* Shut down and drop back to the Open Firmware interface. */
+void
+OF_exit()
+{
+
+	if (ofw_def_impl == NULL)
+		panic("OF_exit: Open Firmware not available");
+
+	/* Should not return */
+	OFW_EXIT(ofw_obj);
+
+	for (;;)			/* just in case */
+		;
+}