move CDDL licensed machine description support routine files to cddl directory

update files.sun4v accordingly

13 files changed, 1538 insertions, 0 deletions

diff --git a/sys/sun4v/cddl/mdesc/mdesc_diff.c b/sys/sun4v/cddl/mdesc/mdesc_diff.c
new file mode 100644
index 0000000..4bd2334
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_diff.c
@@ -0,0 +1,603 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"@(#)mdesc_diff.c	1.1	06/05/16 SMI"
+
+#include <sys/types.h>
+#ifdef _KERNEL
+#include <sys/systm.h>
+#else /* _KERNEL */
+#include <string.h>
+#include <strings.h>
+#endif /* _KERNEL */
+#include <sys/note.h>
+#include <sys/mdesc.h>
+#include <sys/mdesc_impl.h>
+
+#define	MDD_FREE_CHECK(mdp, ptr, sz)		\
+	do {					\
+		if (ptr) mdp->freep(ptr, sz);	\
+	_NOTE(CONSTCOND) } while (0)
+
+#define	MD_DIFF_MAGIC			0x4D445F4449464621ull	/* 'MD_DIFF!' */
+#define	MD_DIFF_NOMATCH			(-1)
+#define	MD_DIFF_MATCH			(1)
+
+typedef struct {
+	mde_cookie_t	*mdep;
+	uint_t		nelem;
+} md_diff_t;
+
+typedef struct {
+	uint64_t	mdd_magic;
+	md_diff_t	added;
+	md_diff_t	removed;
+	md_diff_t	match1;
+	md_diff_t	match2;
+	void 		*(*allocp)(size_t);
+	void		(*freep)(void *, size_t);
+} md_diff_impl_t;
+
+/*
+ * Internal utility functions
+ */
+static int mdd_scan_for_nodes(md_t *mdp, mde_cookie_t start,
+    char *compnodep, int *countp, mde_cookie_t **nodespp);
+
+static boolean_t mdd_any_dup_nodes(md_impl_t *mdp, md_prop_match_t *pmp,
+    int count, mde_cookie_t *nodesp);
+
+static int mdd_node_list_match(md_impl_t *md1, md_impl_t *md2,
+    md_element_t *match_nodep, mde_cookie_t *match_listp,
+    uint8_t *match_seenp, int start, int end, md_prop_match_t *match_elemsp);
+
+static int mdd_node_compare(md_impl_t *mdap, md_impl_t *mdbp,
+    md_element_t *nodeap, md_element_t *nodebp, md_prop_match_t *match_elemsp);
+
+/*
+ * Given two DAGs and information about how to uniquely identify
+ * the nodes of interest, determine which nodes have been added
+ * to the second MD, removed from the first MD, or exist in both
+ * MDs. This information is recorded and can be accessed using the
+ * opaque cookie returned to the caller.
+ */
+md_diff_cookie_t
+md_diff_init(md_t *md1p, mde_cookie_t start1, md_t *md2p, mde_cookie_t start2,
+    char *compnodep, md_prop_match_t *match_fieldsp)
+{
+	int		idx;
+	md_impl_t	*md1 = (md_impl_t *)md1p;
+	md_impl_t	*md2 = (md_impl_t *)md2p;
+	mde_cookie_t	*md1nodesp = NULL;
+	mde_cookie_t	*md2nodesp = NULL;
+	int		md1count = 0;
+	int		md2count = 0;
+	uint8_t		*seenp = NULL;
+
+	/* variables used to gather results */
+	md_diff_impl_t	*diff_res;
+	mde_cookie_t	*mde_add_scr;
+	mde_cookie_t	*mde_rem_scr;
+	mde_cookie_t	*mde_match1_scr;
+	mde_cookie_t	*mde_match2_scr;
+	int		nadd = 0;
+	int		nrem = 0;
+	int		nmatch = 0;
+
+	/* sanity check params */
+	if ((md1p == NULL) || (md2p == NULL))
+		return (MD_INVAL_DIFF_COOKIE);
+
+	if ((start1 == MDE_INVAL_ELEM_COOKIE) ||
+	    (start2 == MDE_INVAL_ELEM_COOKIE))
+		return (MD_INVAL_DIFF_COOKIE);
+
+	if ((compnodep == NULL) || (match_fieldsp == NULL))
+		return (MD_INVAL_DIFF_COOKIE);
+
+	/*
+	 * Prepare an array of the matching nodes from the first MD.
+	 */
+	if (mdd_scan_for_nodes(md1p,
+	    start1, compnodep, &md1count, &md1nodesp) == -1)
+		return (MD_INVAL_DIFF_COOKIE);
+
+	/* sanity check that all nodes are unique */
+	if (md1nodesp &&
+	    mdd_any_dup_nodes(md1, match_fieldsp, md1count, md1nodesp)) {
+		MDD_FREE_CHECK(md1, md1nodesp, sizeof (mde_cookie_t) *
+		    md1count);
+		return (MD_INVAL_DIFF_COOKIE);
+	}
+
+
+	/*
+	 * Prepare an array of the matching nodes from the second MD.
+	 */
+	if (mdd_scan_for_nodes(md2p,
+	    start2, compnodep, &md2count, &md2nodesp) == -1)
+		return (MD_INVAL_DIFF_COOKIE);
+
+	/* sanity check that all nodes are unique */
+	if (md2nodesp &&
+	    mdd_any_dup_nodes(md2, match_fieldsp, md2count, md2nodesp)) {
+		MDD_FREE_CHECK(md1, md1nodesp, sizeof (mde_cookie_t) *
+		    md1count);
+		MDD_FREE_CHECK(md2, md2nodesp, sizeof (mde_cookie_t) *
+		    md2count);
+		return (MD_INVAL_DIFF_COOKIE);
+	}
+
+	/* setup our result structure */
+	diff_res = md1->allocp(sizeof (md_diff_impl_t));
+	bzero(diff_res, sizeof (md_diff_impl_t));
+	diff_res->allocp = md1->allocp;
+	diff_res->freep = md1->freep;
+	diff_res->mdd_magic = MD_DIFF_MAGIC;
+
+	/*
+	 * Special cases for empty lists
+	 */
+	if ((md1count == 0) && (md2count != 0)) {
+		/* all the nodes found were added */
+		diff_res->added.mdep = md2nodesp;
+		diff_res->added.nelem = md2count;
+		return ((mde_cookie_t)diff_res);
+	}
+
+	if ((md1count != 0) && (md2count == 0)) {
+		/* all the nodes found were removed */
+		diff_res->removed.mdep = md1nodesp;
+		diff_res->removed.nelem = md1count;
+		return ((mde_cookie_t)diff_res);
+	}
+
+	if ((md1count == 0) && (md2count == 0))
+		/* no nodes found */
+		return ((mde_cookie_t)diff_res);
+
+	/*
+	 * Both lists have some elements. Allocate some scratch
+	 * buffers to sort them into our three categories, added,
+	 * removed, and matched pairs.
+	 */
+	mde_add_scr = diff_res->allocp(sizeof (mde_cookie_t) * md2count);
+	mde_rem_scr = diff_res->allocp(sizeof (mde_cookie_t) * md1count);
+	mde_match1_scr = diff_res->allocp(sizeof (mde_cookie_t) * md1count);
+	mde_match2_scr = diff_res->allocp(sizeof (mde_cookie_t) * md2count);
+
+	/* array of seen flags only needed for md2 */
+	seenp = (uint8_t *)diff_res->allocp(sizeof (uint8_t) * md2count);
+	bzero(seenp, sizeof (uint8_t) * md2count);
+
+	/*
+	 * Make a pass through the md1 node array. Make note of
+	 * any nodes not in the md2 array, indicating that they
+	 * have been removed. Also keep track of the nodes that
+	 * are present in both arrays for the matched pair results.
+	 */
+	for (idx = 0; idx < md1count; idx++) {
+
+		md_element_t *elem = &(md1->mdep[md1nodesp[idx]]);
+
+		int match = mdd_node_list_match(md1, md2, elem, md2nodesp,
+		    seenp, 0, md2count - 1, match_fieldsp);
+
+		if (match == MD_DIFF_NOMATCH)
+			/* record deleted node */
+			mde_rem_scr[nrem++] = md1nodesp[idx];
+		else {
+			/* record matched node pair */
+			mde_match1_scr[nmatch] = md1nodesp[idx];
+			mde_match2_scr[nmatch] = md2nodesp[match];
+			nmatch++;
+
+			/* mark that this match has been recorded */
+			seenp[match] = 1;
+		}
+	}
+
+	/*
+	 * Make a pass through the md2 array. Any nodes that have
+	 * not been marked as seen have been added.
+	 */
+	for (idx = 0; idx < md2count; idx++) {
+		if (!seenp[idx])
+			/* record added node */
+			mde_add_scr[nadd++] = md2nodesp[idx];
+	}
+
+	/* fill in the added node list */
+	if (nadd) {
+		int addsz = sizeof (mde_cookie_t) * nadd;
+		diff_res->added.mdep = (mde_cookie_t *)diff_res->allocp(addsz);
+
+		bcopy(mde_add_scr, diff_res->added.mdep, addsz);
+
+		diff_res->added.nelem = nadd;
+	}
+
+	/* fill in the removed node list */
+	if (nrem) {
+		int remsz = sizeof (mde_cookie_t) * nrem;
+		diff_res->removed.mdep =
+		    (mde_cookie_t *)diff_res->allocp(remsz);
+
+		bcopy(mde_rem_scr, diff_res->removed.mdep, remsz);
+		diff_res->removed.nelem = nrem;
+	}
+
+	/* fill in the matching node lists */
+	if (nmatch) {
+		int matchsz = sizeof (mde_cookie_t) * nmatch;
+		diff_res->match1.mdep =
+		    (mde_cookie_t *)diff_res->allocp(matchsz);
+		diff_res->match2.mdep =
+		    (mde_cookie_t *)diff_res->allocp(matchsz);
+
+		bcopy(mde_match1_scr, diff_res->match1.mdep, matchsz);
+		bcopy(mde_match2_scr, diff_res->match2.mdep, matchsz);
+		diff_res->match1.nelem = nmatch;
+		diff_res->match2.nelem = nmatch;
+	}
+
+	/* clean up */
+	md1->freep(md1nodesp, sizeof (mde_cookie_t) * md1count);
+	md2->freep(md2nodesp, sizeof (mde_cookie_t) * md2count);
+
+	diff_res->freep(mde_add_scr, sizeof (mde_cookie_t) * md2count);
+	diff_res->freep(mde_rem_scr, sizeof (mde_cookie_t) * md1count);
+	diff_res->freep(mde_match1_scr, sizeof (mde_cookie_t) * md1count);
+	diff_res->freep(mde_match2_scr, sizeof (mde_cookie_t) * md2count);
+
+	diff_res->freep(seenp, sizeof (uint8_t) * md2count);
+
+	return ((md_diff_cookie_t)diff_res);
+}
+
+/*
+ * Returns an array of the nodes added to the second MD in a
+ * previous md_diff_init() call. Returns the number of elements
+ * in the returned array. If the value is zero, the pointer
+ * passed back will be NULL.
+ */
+int
+md_diff_added(md_diff_cookie_t mdd, mde_cookie_t **mde_addedp)
+{
+	md_diff_impl_t	*mddp = (md_diff_impl_t *)mdd;
+
+	if ((mddp == NULL) || (mddp->mdd_magic != MD_DIFF_MAGIC))
+		return (-1);
+
+	*mde_addedp = mddp->added.mdep;
+
+	return (mddp->added.nelem);
+}
+
+/*
+ * Returns an array of the nodes removed from the first MD in a
+ * previous md_diff_init() call. Returns the number of elements
+ * in the returned array. If the value is zero, the pointer
+ * passed back will be NULL.
+ */
+int
+md_diff_removed(md_diff_cookie_t mdd, mde_cookie_t **mde_removedp)
+{
+	md_diff_impl_t	*mddp = (md_diff_impl_t *)mdd;
+
+	if ((mddp == NULL) || (mddp->mdd_magic != MD_DIFF_MAGIC))
+		return (-1);
+
+	*mde_removedp = mddp->removed.mdep;
+
+	return (mddp->removed.nelem);
+}
+
+/*
+ * Returns a pair of parallel arrays that contain nodes that were
+ * considered matching based on the match criteria passed in to
+ * a previous md_diff_init() call. Returns the number of elements
+ * in the arrays. If the value is zero, both pointers passed back
+ * will be NULL.
+ */
+int
+md_diff_matched(md_diff_cookie_t mdd, mde_cookie_t **mde_match1p,
+    mde_cookie_t **mde_match2p)
+{
+	md_diff_impl_t	*mddp = (md_diff_impl_t *)mdd;
+
+	if ((mddp == NULL) || (mddp->mdd_magic != MD_DIFF_MAGIC))
+		return (-1);
+
+	*mde_match1p = mddp->match1.mdep;
+	*mde_match2p = mddp->match2.mdep;
+
+	return (mddp->match1.nelem);
+}
+
+/*
+ * Deallocate any storage used to store results of a previous
+ * md_diff_init() call. Returns 0 on success and -1 on failure.
+ */
+int
+md_diff_fini(md_diff_cookie_t mdd)
+{
+	md_diff_impl_t	*mddp = (md_diff_impl_t *)mdd;
+
+	if ((mddp == NULL) || (mddp->mdd_magic != MD_DIFF_MAGIC))
+		return (-1);
+
+	mddp->mdd_magic = 0;
+
+	MDD_FREE_CHECK(mddp, mddp->added.mdep, mddp->added.nelem *
+	    sizeof (mde_cookie_t));
+
+	MDD_FREE_CHECK(mddp, mddp->removed.mdep, mddp->removed.nelem *
+	    sizeof (mde_cookie_t));
+
+	MDD_FREE_CHECK(mddp, mddp->match1.mdep, mddp->match1.nelem *
+	    sizeof (mde_cookie_t));
+
+	MDD_FREE_CHECK(mddp, mddp->match2.mdep, mddp->match2.nelem *
+	    sizeof (mde_cookie_t));
+
+	mddp->freep(mddp, sizeof (md_diff_impl_t));
+
+	return (0);
+}
+
+/*
+ * Walk the "fwd" DAG in an MD and return an array of nodes that are
+ * of the specified type. The start param is used to start the walk
+ * from an arbitrary location in the DAG. Returns an array of nodes
+ * as well as a count of the number of nodes in the array.  If the
+ * count is zero, the node pointer will be passed back as NULL.
+ *
+ * Returns: 0 success; -1 failure
+ */
+static int
+mdd_scan_for_nodes(md_t *mdp,
+    mde_cookie_t start, char *compnodep, int *countp, mde_cookie_t **nodespp)
+{
+	mde_str_cookie_t	cname;
+	mde_str_cookie_t	aname;
+	md_impl_t		*mdip = (md_impl_t *)mdp;
+
+	if (mdip == NULL)
+		return (-1);
+
+	cname = md_find_name(mdp, compnodep);
+	aname = md_find_name(mdp, "fwd");
+
+	/* get the number of nodes of interest in the DAG */
+	*countp = md_scan_dag(mdp, start, cname, aname, NULL);
+	if (*countp == 0) {
+		*nodespp = NULL;
+		return (0);
+	}
+
+	/* allocate the storage */
+	*nodespp = mdip->allocp(sizeof (mde_cookie_t) * (*countp));
+
+	/* populate our array with the matching nodes */
+	(void) md_scan_dag(mdp, start, cname, aname, *nodespp);
+
+	return (0);
+}
+
+/*
+ * Walk an array of nodes and check if there are any duplicate
+ * nodes. A duplicate is determined based on the specified match
+ * criteria. Returns B_TRUE if there are any duplicates and B_FALSE
+ * otherwise.
+ */
+static boolean_t
+mdd_any_dup_nodes(md_impl_t *mdp, md_prop_match_t *pmp, int count,
+    mde_cookie_t *nodesp)
+{
+	int		idx;
+	int		match;
+	md_element_t	*elem;
+
+	ASSERT(count > 0 || nodesp == NULL);
+
+	for (idx = 0; idx < count; idx++) {
+		elem = &(mdp->mdep[nodesp[idx]]);
+
+		match = mdd_node_list_match(mdp, mdp, elem, nodesp, NULL,
+		    idx + 1, count - 1, pmp);
+
+		if (match != MD_DIFF_NOMATCH)
+			return (B_TRUE);
+	}
+
+	return (B_FALSE);
+}
+
+/*
+ * Given a node and a array of nodes, compare the node to all elements
+ * in the specified start-end range of the array. If the node matches
+ * one of the nodes in the array, return the index of that node. Otherwise
+ * return MD_DIFF_NOMATCH.
+ *
+ * The optional seen array parameter can be used to optimize repeated
+ * calls to this function. If the seen array indicates that an element
+ * has already been matched, the full comparison is not necessary.
+ */
+static int
+mdd_node_list_match(md_impl_t *md1, md_impl_t *md2, md_element_t *match_nodep,
+    mde_cookie_t *match_listp, uint8_t *match_seenp, int start, int end,
+    md_prop_match_t *match_elemsp)
+{
+	int		match;
+	int		idx;
+	md_element_t	*elem;
+
+	for (idx = start; idx <= end; idx++) {
+
+		if ((match_seenp != NULL) && (match_seenp[idx]))
+			continue;
+
+		elem = &(md2->mdep[match_listp[idx]]);
+
+		match = mdd_node_compare(md1, md2, match_nodep, elem,
+		    match_elemsp);
+		if (match == MD_DIFF_MATCH)
+			return (idx);
+	}
+
+	return (MD_DIFF_NOMATCH);
+}
+
+/*
+ * Given two nodes and a list of properties, compare the nodes.
+ * A match is concluded if both nodes have all of the specified
+ * properties and all the values of those properties are the
+ * same. Returns MD_DIFF_NOMATCH if the nodes do not match and
+ * MD_DIFF_MATCH otherwise.
+ */
+static int
+mdd_node_compare(md_impl_t *mdap, md_impl_t *mdbp, md_element_t *nodeap,
+    md_element_t *nodebp, md_prop_match_t *match_elemsp)
+{
+	md_element_t	*ap;
+	md_element_t	*bp;
+	boolean_t	nodea_interest;
+	boolean_t	nodeb_interest;
+	int		idx;
+
+	/* make sure we are starting at the beginning of the nodes */
+	if ((MDE_TAG(nodeap) != MDET_NODE) || (MDE_TAG(nodebp) != MDET_NODE))
+		return (MD_DIFF_NOMATCH);
+
+	for (idx = 0; match_elemsp[idx].type != MDET_LIST_END; idx++) {
+
+		int type;
+
+		nodea_interest = B_FALSE;
+		nodeb_interest = B_FALSE;
+
+		type = match_elemsp[idx].type;
+
+		/*
+		 * Check node A for the property of interest
+		 */
+		for (ap = nodeap; MDE_TAG(ap) != MDET_NODE_END; ap++) {
+			char *elemname;
+
+			if (MDE_TAG(ap) != type)
+				continue;
+
+			elemname = mdap->namep + MDE_NAME(ap);
+
+			if (strcmp(elemname, match_elemsp[idx].namep) == 0) {
+				/* found the property of interest */
+				nodea_interest = B_TRUE;
+				break;
+			}
+		}
+
+		/* node A is not of interest */
+		if (!nodea_interest)
+			return (MD_DIFF_NOMATCH);
+
+		/*
+		 * Check node B for the property of interest
+		 */
+		for (bp = nodebp; MDE_TAG(bp) != MDET_NODE_END; bp++) {
+			char *elemname;
+
+			if (MDE_TAG(bp) != type)
+				continue;
+
+			elemname = mdbp->namep + MDE_NAME(bp);
+
+			if (strcmp(elemname, match_elemsp[idx].namep) == 0) {
+				nodeb_interest = B_TRUE;
+				break;
+			}
+		}
+
+		/* node B is not of interest */
+		if (!nodeb_interest)
+			return (MD_DIFF_NOMATCH);
+
+		/*
+		 * Both nodes have the property of interest. The
+		 * nodes are not a match unless the value of that
+		 * property match
+		 */
+		switch (type) {
+		case MDET_PROP_VAL:
+			if (MDE_PROP_VALUE(ap) != MDE_PROP_VALUE(bp))
+				return (MD_DIFF_NOMATCH);
+			break;
+
+		case MDET_PROP_STR: {
+			char *stra = (char *)(mdap->datap +
+			    MDE_PROP_DATA_OFFSET(ap));
+			char *strb = (char *)(mdbp->datap +
+			    MDE_PROP_DATA_OFFSET(bp));
+
+			if (strcmp(stra, strb) != 0)
+				return (MD_DIFF_NOMATCH);
+			break;
+		}
+
+		case MDET_PROP_DAT: {
+
+			caddr_t dataa;
+			caddr_t datab;
+
+			if (MDE_PROP_DATA_LEN(ap) != MDE_PROP_DATA_LEN(bp))
+				return (MD_DIFF_NOMATCH);
+
+			dataa = (caddr_t)(mdap->datap +
+			    MDE_PROP_DATA_OFFSET(ap));
+			datab = (caddr_t)(mdbp->datap +
+			    MDE_PROP_DATA_OFFSET(bp));
+
+			if (memcmp(dataa, datab, MDE_PROP_DATA_LEN(ap)) != 0)
+				return (MD_DIFF_NOMATCH);
+
+			break;
+		}
+
+		default:
+			/* unsupported prop type */
+			return (MD_DIFF_NOMATCH);
+		}
+	}
+
+	/*
+	 * All the specified properties exist in both
+	 * nodes and have the same value. The two nodes
+	 * match.
+	 */
+
+	return (MD_DIFF_MATCH);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_findname.c b/sys/sun4v/cddl/mdesc/mdesc_findname.c
new file mode 100644
index 0000000..c961619
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_findname.c
@@ -0,0 +1,67 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+
+#include <sys/types.h>
+
+#ifdef _KERNEL
+#include <sys/systm.h>
+#else
+#include <strings.h>
+#endif
+
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+mde_str_cookie_t
+md_find_name(md_t *ptr, char *namep)
+{
+	int idx, len;
+	md_impl_t *mdp;
+
+	mdp = (md_impl_t *)ptr;
+
+	/*
+	 * At some point init should build a local hash table to
+	 * speed these name searches ... for now use brute force
+	 * because the machien descriptions are so small anyway.
+	 */
+
+	for (idx = 0; idx < mdp->name_blk_size; idx += len) {
+		char *p;
+
+		p = &(mdp->namep[idx]);
+
+		len = strlen(p)+1;
+
+		if (strcmp(p, namep) == 0)
+			return ((mde_str_cookie_t)idx);
+	}
+
+	return (MDE_INVAL_STR_COOKIE);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_findnodeprop.c b/sys/sun4v/cddl/mdesc/mdesc_findnodeprop.c
new file mode 100644
index 0000000..558b976
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_findnodeprop.c
@@ -0,0 +1,76 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+mde_cookie_t
+md_find_node_prop(md_impl_t *mdp,
+	mde_cookie_t node,
+	mde_str_cookie_t prop_name,
+	int tag_type)
+{
+	md_element_t *mdep;
+	int idx;
+
+	if (node == MDE_INVAL_ELEM_COOKIE ||
+	    prop_name == MDE_INVAL_STR_COOKIE) {
+		return (MDE_INVAL_ELEM_COOKIE);
+	}
+
+	idx = (int)node;
+	mdep = &(mdp->mdep[idx]);
+
+		/* Skip over any empty elements */
+	while (MDE_TAG(mdep) == MDET_NULL) {
+		idx++;
+		mdep++;
+	}
+
+		/* see if cookie is infact a node */
+	if (MDE_TAG(mdep) != MDET_NODE) {
+		return (MDE_INVAL_ELEM_COOKIE);
+	}
+
+	/*
+	 * Simply walk the elements in the node
+	 * looking for a property with a matching name.
+	 */
+
+	for (idx++, mdep++; MDE_TAG(mdep) != MDET_NODE_END; idx++, mdep++) {
+		if (MDE_TAG(mdep) == tag_type) {
+			if (MDE_NAME(mdep) == prop_name) {
+				return ((mde_cookie_t)idx);
+			}
+		}
+	}
+
+	return (MDE_INVAL_ELEM_COOKIE);	/* no such property name */
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_fini.c b/sys/sun4v/cddl/mdesc/mdesc_fini.c
new file mode 100644
index 0000000..ff32ce8
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_fini.c
@@ -0,0 +1,48 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"@(#)mdesc_fini.c	1.4	06/05/16 SMI"
+
+#include <sys/types.h>
+#include <sys/mdesc.h>
+#include <sys/mdesc_impl.h>
+
+/*
+ * Cleanup the internal MD structure. Does not
+ * deallocate the buffer holding the MD.
+ */
+int
+md_fini(md_t *ptr)
+{
+	md_impl_t *mdp;
+
+	mdp = (md_impl_t *)ptr;
+
+	mdp->freep(mdp, sizeof (md_impl_t));
+
+	return (0);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_getbinsize.c b/sys/sun4v/cddl/mdesc/mdesc_getbinsize.c
new file mode 100644
index 0000000..c3e2386
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_getbinsize.c
@@ -0,0 +1,46 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"@(#)mdesc_getbinsize.c	1.1	06/05/16 SMI"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/mdesc.h>
+#include <sys/mdesc_impl.h>
+
+size_t
+md_get_bin_size(md_t *ptr)
+{
+	md_impl_t *mdp;
+
+	mdp = (md_impl_t *)ptr;
+
+	if (mdp == NULL)
+		return (0);
+
+	return (mdp->size);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_getgen.c b/sys/sun4v/cddl/mdesc/mdesc_getgen.c
new file mode 100644
index 0000000..7d1ad51
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_getgen.c
@@ -0,0 +1,46 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"@(#)mdesc_getgen.c	1.1	06/05/16 SMI"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/mdesc.h>
+#include <sys/mdesc_impl.h>
+
+uint64_t
+md_get_gen(md_t *ptr)
+{
+	md_impl_t *mdp;
+
+	mdp = (md_impl_t *)ptr;
+
+	if (mdp == NULL)
+		return (MDESC_INVAL_GEN);
+
+	return (mdp->gen);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_getpropdata.c b/sys/sun4v/cddl/mdesc/mdesc_getpropdata.c
new file mode 100644
index 0000000..199a436
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_getpropdata.c
@@ -0,0 +1,65 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"@(#)mdesc_getpropdata.c	1.2	05/06/08 SMI"
+
+#include <sys/types.h>
+#include <sys/mdesc.h>
+#include <sys/mdesc_impl.h>
+
+int
+md_get_prop_data(md_t *ptr, mde_cookie_t node, char *namep,
+	uint8_t **datap, int *lenp)
+{
+	mde_str_cookie_t prop_name;
+	md_impl_t *mdp;
+	mde_cookie_t	elem;
+
+	mdp = (md_impl_t *)ptr;
+
+	if (node == MDE_INVAL_ELEM_COOKIE) {
+		return (-1);
+	}
+
+	prop_name = md_find_name(ptr, namep);
+	if (prop_name == MDE_INVAL_STR_COOKIE) {
+		return (-1);
+	}
+
+	elem = md_find_node_prop(mdp, node, prop_name, MDET_PROP_DAT);
+
+	if (elem != MDE_INVAL_ELEM_COOKIE) {
+		md_element_t *mdep;
+		mdep = &(mdp->mdep[(int)elem]);
+
+		*lenp = (int)MDE_PROP_DATA_LEN(mdep);
+		*datap = mdp->datap+(int)MDE_PROP_DATA_OFFSET(mdep);
+		return (0);
+	}
+
+	return (-1);	/* no such property name */
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_getpropstr.c b/sys/sun4v/cddl/mdesc/mdesc_getpropstr.c
new file mode 100644
index 0000000..61f9c30
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_getpropstr.c
@@ -0,0 +1,62 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <sys/types.h>
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+int
+md_get_prop_str(md_t *ptr, mde_cookie_t node, char *namep, char **strp)
+{
+	mde_str_cookie_t prop_name;
+	md_impl_t	*mdp;
+	mde_cookie_t	elem;
+
+	mdp = (md_impl_t *)ptr;
+
+	if (node == MDE_INVAL_ELEM_COOKIE) {
+		return (-1);
+	}
+
+	prop_name = md_find_name(ptr, namep);
+	if (prop_name == MDE_INVAL_STR_COOKIE) {
+		return (-1);
+	}
+
+	elem = md_find_node_prop(mdp, node, prop_name, MDET_PROP_STR);
+
+	if (elem != MDE_INVAL_ELEM_COOKIE) {
+		md_element_t *mdep;
+		mdep = &(mdp->mdep[(int)elem]);
+
+		*strp = (char *)(mdp->datap+
+			MDE_PROP_DATA_OFFSET(mdep));
+		return (0);
+	}
+
+	return (-1);	/* no such property name */
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_getpropval.c b/sys/sun4v/cddl/mdesc/mdesc_getpropval.c
new file mode 100644
index 0000000..3a17d5c
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_getpropval.c
@@ -0,0 +1,68 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+#include <sys/types.h>
+#ifdef _KERNEL
+#include <sys/systm.h>
+#else
+#include <strings.h>
+#endif
+
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+int
+md_get_prop_val(md_t *ptr, mde_cookie_t node, char *namep, uint64_t *valp)
+{
+	mde_str_cookie_t prop_name;
+	md_impl_t	*mdp;
+	mde_cookie_t	elem;
+
+	mdp = (md_impl_t *)ptr;
+
+	if (node == MDE_INVAL_ELEM_COOKIE) {
+		return (-1);
+	}
+
+	prop_name = md_find_name(ptr, namep);
+	if (prop_name == MDE_INVAL_STR_COOKIE) {
+		return (-1);
+	}
+
+	elem = md_find_node_prop(mdp, node, prop_name, MDET_PROP_VAL);
+
+	if (elem != MDE_INVAL_ELEM_COOKIE) {
+		md_element_t *mdep;
+		mdep = &(mdp->mdep[(int)elem]);
+
+		*valp = MDE_PROP_VALUE(mdep);
+		return (0);
+	}
+
+	return (-1);	/* no such property name */
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_init_intern.c b/sys/sun4v/cddl/mdesc/mdesc_init_intern.c
new file mode 100644
index 0000000..dd5973e
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_init_intern.c
@@ -0,0 +1,178 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+md_t *
+md_init_intern(uint64_t *ptr,  void *(*allocp)(size_t),
+	    void (*freep)(void *, size_t))
+{
+	md_impl_t	*mdp;
+	int		idx;
+	int		count;
+	int		done;
+	uint64_t	gen;
+	mde_str_cookie_t root_name;
+
+	/*
+	 * Very basic checkup for alignment to avoid
+	 * bus error issues.
+	 */
+	if ((((uintptr_t)ptr) & 7) != 0)
+		return (NULL);
+
+	mdp = (md_impl_t *)allocp(sizeof (md_impl_t));
+
+	if (mdp == NULL)
+		return (NULL);
+
+	mdp->allocp = allocp;
+	mdp->freep = freep;
+
+	mdp->caddr = (char *)ptr;
+
+	/*
+	 * setup internal structures
+	 */
+
+	mdp->headerp = (md_header_t *)mdp->caddr;
+
+	if (mdtoh32(mdp->headerp->transport_version) != MD_TRANSPORT_VERSION) {
+		goto cleanup_nohash;
+	}
+
+	mdp->node_blk_size = mdtoh32(mdp->headerp->node_blk_sz);
+	mdp->name_blk_size = mdtoh32(mdp->headerp->name_blk_sz);
+	mdp->data_blk_size = mdtoh32(mdp->headerp->data_blk_sz);
+
+	mdp->size = MD_HEADER_SIZE + mdp->node_blk_size +
+	    mdp->name_blk_size + mdp->data_blk_size;
+
+	mdp->mdep = (md_element_t *)(mdp->caddr + MD_HEADER_SIZE);
+	mdp->namep = (char *)(mdp->caddr + MD_HEADER_SIZE + mdp->node_blk_size);
+	mdp->datap = (uint8_t *)(mdp->caddr + MD_HEADER_SIZE +
+	    mdp->name_blk_size + mdp->node_blk_size);
+
+	mdp->root_node = MDE_INVAL_ELEM_COOKIE;
+
+
+	/*
+	 * Should do a lot more sanity checking here.
+	 */
+
+	/*
+	 * Should initialize a name hash here if we intend to use one
+	 */
+
+	/*
+	 * Setup to find the root node
+	 */
+	root_name = md_find_name((md_t *)mdp, "root");
+	if (root_name == MDE_INVAL_STR_COOKIE) {
+		goto cleanup;
+	}
+
+	/*
+	 * One more property we need is the count of nodes in the
+	 * DAG, not just the number of elements.
+	 *
+	 * We try and pickup the root node along the way here.
+	 */
+
+	for (done = 0, idx = 0, count = 0; !done; ) {
+		md_element_t *np;
+
+		np = &(mdp->mdep[idx]);
+
+		switch (MDE_TAG(np)) {
+		case MDET_LIST_END:
+			done = 1;
+			break;
+
+		case MDET_NODE:
+			if (root_name == MDE_NAME(np)) {
+				if (mdp->root_node != MDE_INVAL_ELEM_COOKIE) {
+					/* Gah .. more than one root */
+					goto cleanup;
+				}
+				mdp->root_node = (mde_cookie_t)idx;
+			}
+			idx = MDE_PROP_INDEX(np);
+			count++;
+			break;
+
+		default:
+			idx++;	/* ignore */
+		}
+	}
+
+	/*
+	 * Ensure there is a root node
+	 */
+	if (mdp->root_node == MDE_INVAL_ELEM_COOKIE) {
+		goto cleanup;
+	}
+
+	/*
+	 * Register the counts
+	 */
+
+	mdp->element_count = idx + 1;	/* include LIST_END */
+	mdp->node_count = count;
+
+	/*
+	 * Final sanity check that everything adds up
+	 */
+	if (mdp->element_count != (mdp->node_blk_size / MD_ELEMENT_SIZE))
+		goto cleanup;
+
+	mdp->md_magic = LIBMD_MAGIC;
+
+	/*
+	 * Setup MD generation
+	 */
+	if (md_get_prop_val((md_t *)mdp, mdp->root_node,
+	    "md-generation#", &gen) != 0)
+		mdp->gen = MDESC_INVAL_GEN;
+	else
+		mdp->gen = gen;
+
+	return ((md_t *)mdp);
+
+cleanup:
+	/*
+	 * Clean up here - including a name hash if
+	 * we build one.
+	 */
+
+cleanup_nohash:
+	mdp->freep(mdp, sizeof (md_impl_t));
+	return (NULL);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_nodecount.c b/sys/sun4v/cddl/mdesc/mdesc_nodecount.c
new file mode 100644
index 0000000..1c0376d
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_nodecount.c
@@ -0,0 +1,44 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+#include <sys/types.h>
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+int
+md_node_count(md_t *ptr)
+{
+	md_impl_t *mdp;
+
+	mdp = (md_impl_t *)ptr;
+
+	if (mdp->md_magic != LIBMD_MAGIC)
+		return (-1);
+
+	return (mdp->node_count);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_rootnode.c b/sys/sun4v/cddl/mdesc/mdesc_rootnode.c
new file mode 100644
index 0000000..2e4437a
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_rootnode.c
@@ -0,0 +1,44 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+#include <sys/types.h>
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+mde_cookie_t
+md_root_node(md_t *ptr)
+{
+	md_impl_t *mdp;
+
+	mdp = (md_impl_t *)ptr;
+
+	if (mdp->md_magic != LIBMD_MAGIC)
+		return (MDE_INVAL_ELEM_COOKIE);
+
+	return (mdp->root_node);
+}
diff --git a/sys/sun4v/cddl/mdesc/mdesc_scandag.c b/sys/sun4v/cddl/mdesc/mdesc_scandag.c
new file mode 100644
index 0000000..4d7716a
--- /dev/null
+++ b/sys/sun4v/cddl/mdesc/mdesc_scandag.c
@@ -0,0 +1,191 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ * $FreeBSD$
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#ifdef _KERNEL
+#include <sys/systm.h>
+#else
+#include <string.h>
+#include <strings.h>
+#endif
+
+#include <machine/cddl/mdesc.h>
+#include <machine/cddl/mdesc_impl.h>
+
+static int
+mdl_scan_dag(md_impl_t *mdp,
+	int nodeidx,
+	mde_str_cookie_t node_cookie,
+	mde_str_cookie_t arc_cookie,
+	uint8_t *dseenp,
+	int *idxp,
+	mde_cookie_t *stashp,
+	int level);
+
+
+int
+md_scan_dag(md_t *ptr,
+	mde_cookie_t startnode,
+	mde_str_cookie_t node_name_cookie,
+	mde_str_cookie_t arc_name_cookie,
+	mde_cookie_t *stashp)
+{
+	int	res;
+	int	idx;
+	uint8_t *seenp;
+	md_impl_t *mdp;
+	int	start;
+
+	mdp = (md_impl_t *)ptr;
+
+	/*
+	 * Possible the caller was lazy and didn't check the
+	 * validitiy of either the node name or the arc name
+	 * on calling ... in which case fail to find any
+	 * nodes.
+	 * This is distinct, from a fail (-1) since we return
+	 * that nothing was found.
+	 */
+
+	if (node_name_cookie == MDE_INVAL_STR_COOKIE ||
+		arc_name_cookie == MDE_INVAL_STR_COOKIE) return 0;
+
+	/*
+	 * if we want to start at the top, start at index 0
+	 */
+
+	start = (int)startnode;
+	if (start == MDE_INVAL_ELEM_COOKIE) start = 0;
+
+	/*
+	 * Scan from the start point until the first node.
+	 */
+	while (MDE_TAG(&mdp->mdep[start]) == MDET_NULL) start++;
+
+	/*
+	 * This was a bogus start point if no node found
+	 */
+	if (MDE_TAG(&mdp->mdep[start]) != MDET_NODE) {
+		return (-1);	/* illegal start node specified */
+	}
+
+	/*
+	 * Allocate a recursion mask on the local stack fail
+	 * if we can't allocate the recursion detection.
+	 */
+	seenp = (uint8_t *)mdp->allocp(mdp->element_count);
+	if (seenp == NULL)
+		return (-1);
+	(void) memset(seenp, 0, mdp->element_count);
+
+	/*
+	 * Now build the list of requested nodes.
+	 */
+	idx = 0;
+	res = mdl_scan_dag(mdp, start,
+		node_name_cookie, arc_name_cookie,
+		seenp, &idx, stashp, 0);
+
+	mdp->freep(seenp, mdp->element_count);
+
+	return (res >= 0 ? idx : res);
+}
+
+
+
+
+
+static int
+mdl_scan_dag(md_impl_t *mdp,
+	int nodeidx,
+	mde_str_cookie_t node_name_cookie,
+	mde_str_cookie_t arc_name_cookie,
+	uint8_t *seenp,
+	int *idxp,
+	mde_cookie_t *stashp,
+	int level)
+{
+	md_element_t *mdep;
+
+	mdep = &(mdp->mdep[nodeidx]);
+
+	/* see if cookie is infact a node */
+	if (MDE_TAG(mdep) != MDET_NODE)
+		return (-1);
+
+	/* have we been here before ? */
+	if (seenp[nodeidx])
+		return (0);
+	seenp[nodeidx] = 1;
+
+	/* is this node of the type we seek ? */
+
+#ifdef	DEBUG_LIBMDESC
+	{
+	int x;
+	for (x = 0; x < level; x++)
+		printf("-");
+	printf("%d (%s)\n", nodeidx, (char *)(mdp->datap + MDE_NAME(mdep)));
+	}
+#endif
+
+	if (MDE_NAME(mdep) == node_name_cookie) {
+		/* record the node in the list and keep searching */
+		if (stashp != NULL) {
+			stashp[*idxp] = (mde_cookie_t)nodeidx;
+		}
+		(*idxp)++;
+#ifdef	DEBUG_LIBMDESC
+		printf("\t* %d\n", *idxp);
+#endif
+	}
+
+	/*
+	 * Simply walk the elements in the node.
+	 * if we find a matching arc, then recursively call
+	 * the subordinate looking for a match
+	 */
+
+	for (mdep++; MDE_TAG(mdep) != MDET_NODE_END; mdep++) {
+		if (MDE_TAG(mdep) == MDET_PROP_ARC &&
+			MDE_NAME(mdep) == arc_name_cookie) {
+			int res;
+
+			res = mdl_scan_dag(mdp,
+			    (int)mdep->d.prop_idx,
+			    node_name_cookie,
+			    arc_name_cookie,
+			    seenp, idxp, stashp, level+1);
+
+			if (res == -1)
+				return (res);
+		}
+	}
+
+	return (0);
+}