dtc/livetree.c

/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *                                                                   USA
 */

#include "dtc.h"

/*
 * Tree building functions
 */

void add_label(struct label **labels, char *label)
{
	struct label *new;

	/* Make sure the label isn't already there */
	for_each_label(*labels, new)
		if (streq(new->label, label))
			return;

	new = xmalloc(sizeof(*new));
	new->label = label;
	new->next = *labels;
	*labels = new;
}

struct property *build_property(char *name, struct data val)
{
	struct property *new = xmalloc(sizeof(*new));

	memset(new, 0, sizeof(*new));

	new->name = name;
	new->val = val;

	return new;
}

struct property *chain_property(struct property *first, struct property *list)
{
	assert(first->next == NULL);

	first->next = list;
	return first;
}

struct property *reverse_properties(struct property *first)
{
	struct property *p = first;
	struct property *head = NULL;
	struct property *next;

	while (p) {
		next = p->next;
		p->next = head;
		head = p;
		p = next;
	}
	return head;
}

struct node *build_node(struct property *proplist, struct node *children)
{
	struct node *new = xmalloc(sizeof(*new));
	struct node *child;

	memset(new, 0, sizeof(*new));

	new->proplist = reverse_properties(proplist);
	new->children = children;

	for_each_child(new, child) {
		child->parent = new;
	}

	return new;
}

struct node *name_node(struct node *node, char *name)
{
	assert(node->name == NULL);

	node->name = name;

	return node;
}

struct node *merge_nodes(struct node *old_node, struct node *new_node)
{
	struct property *new_prop, *old_prop;
	struct node *new_child, *old_child;
	struct label *l;

	/* Add new node labels to old node */
	for_each_label(new_node->labels, l)
		add_label(&old_node->labels, l->label);

	/* Move properties from the new node to the old node.  If there
	 * is a collision, replace the old value with the new */
	while (new_node->proplist) {
		/* Pop the property off the list */
		new_prop = new_node->proplist;
		new_node->proplist = new_prop->next;
		new_prop->next = NULL;

		/* Look for a collision, set new value if there is */
		for_each_property(old_node, old_prop) {
			if (streq(old_prop->name, new_prop->name)) {
				/* Add new labels to old property */
				for_each_label(new_prop->labels, l)
					add_label(&old_prop->labels, l->label);

				old_prop->val = new_prop->val;
				free(new_prop);
				new_prop = NULL;
				break;
			}
		}

		/* if no collision occurred, add property to the old node. */
		if (new_prop)
			add_property(old_node, new_prop);
	}

	/* Move the override child nodes into the primary node.  If
	 * there is a collision, then merge the nodes. */
	while (new_node->children) {
		/* Pop the child node off the list */
		new_child = new_node->children;
		new_node->children = new_child->next_sibling;
		new_child->parent = NULL;
		new_child->next_sibling = NULL;

		/* Search for a collision.  Merge if there is */
		for_each_child(old_node, old_child) {
			if (streq(old_child->name, new_child->name)) {
				merge_nodes(old_child, new_child);
				new_child = NULL;
				break;
			}
		}

		/* if no collision occured, add child to the old node. */
		if (new_child)
			add_child(old_node, new_child);
	}

	/* The new node contents are now merged into the old node.  Free
	 * the new node. */
	free(new_node);

	return old_node;
}

struct node *chain_node(struct node *first, struct node *list)
{
	assert(first->next_sibling == NULL);

	first->next_sibling = list;
	return first;
}

void add_property(struct node *node, struct property *prop)
{
	struct property **p;

	prop->next = NULL;

	p = &node->proplist;
	while (*p)
		p = &((*p)->next);

	*p = prop;
}

void add_child(struct node *parent, struct node *child)
{
	struct node **p;

	child->next_sibling = NULL;
	child->parent = parent;

	p = &parent->children;
	while (*p)
		p = &((*p)->next_sibling);

	*p = child;
}

struct reserve_info *build_reserve_entry(uint64_t address, uint64_t size)
{
	struct reserve_info *new = xmalloc(sizeof(*new));

	memset(new, 0, sizeof(*new));

	new->re.address = address;
	new->re.size = size;

	return new;
}

struct reserve_info *chain_reserve_entry(struct reserve_info *first,
					struct reserve_info *list)
{
	assert(first->next == NULL);

	first->next = list;
	return first;
}

struct reserve_info *add_reserve_entry(struct reserve_info *list,
				      struct reserve_info *new)
{
	struct reserve_info *last;

	new->next = NULL;

	if (! list)
		return new;

	for (last = list; last->next; last = last->next)
		;

	last->next = new;

	return list;
}

struct boot_info *build_boot_info(struct reserve_info *reservelist,
				  struct node *tree, uint32_t boot_cpuid_phys)
{
	struct boot_info *bi;

	bi = xmalloc(sizeof(*bi));
	bi->reservelist = reservelist;
	bi->dt = tree;
	bi->boot_cpuid_phys = boot_cpuid_phys;

	return bi;
}

/*
 * Tree accessor functions
 */

const char *get_unitname(struct node *node)
{
	if (node->name[node->basenamelen] == '\0')
		return "";
	else
		return node->name + node->basenamelen + 1;
}

struct property *get_property(struct node *node, const char *propname)
{
	struct property *prop;

	for_each_property(node, prop)
		if (streq(prop->name, propname))
			return prop;

	return NULL;
}

cell_t propval_cell(struct property *prop)
{
	assert(prop->val.len == sizeof(cell_t));
	return fdt32_to_cpu(*((cell_t *)prop->val.val));
}

struct property *get_property_by_label(struct node *tree, const char *label,
				       struct node **node)
{
	struct property *prop;
	struct node *c;

	*node = tree;

	for_each_property(tree, prop) {
		struct label *l;

		for_each_label(prop->labels, l)
			if (streq(l->label, label))
				return prop;
	}

	for_each_child(tree, c) {
		prop = get_property_by_label(c, label, node);
		if (prop)
			return prop;
	}

	*node = NULL;
	return NULL;
}

struct marker *get_marker_label(struct node *tree, const char *label,
				struct node **node, struct property **prop)
{
	struct marker *m;
	struct property *p;
	struct node *c;

	*node = tree;

	for_each_property(tree, p) {
		*prop = p;
		m = p->val.markers;
		for_each_marker_of_type(m, LABEL)
			if (streq(m->ref, label))
				return m;
	}

	for_each_child(tree, c) {
		m = get_marker_label(c, label, node, prop);
		if (m)
			return m;
	}

	*prop = NULL;
	*node = NULL;
	return NULL;
}

struct node *get_subnode(struct node *node, const char *nodename)
{
	struct node *child;

	for_each_child(node, child)
		if (streq(child->name, nodename))
			return child;

	return NULL;
}

struct node *get_node_by_path(struct node *tree, const char *path)
{
	const char *p;
	struct node *child;

	if (!path || ! (*path))
		return tree;

	while (path[0] == '/')
		path++;

	p = strchr(path, '/');

	for_each_child(tree, child) {
		if (p && strneq(path, child->name, p-path))
			return get_node_by_path(child, p+1);
		else if (!p && streq(path, child->name))
			return child;
	}

	return NULL;
}

struct node *get_node_by_label(struct node *tree, const char *label)
{
	struct node *child, *node;
	struct label *l;

	assert(label && (strlen(label) > 0));

	for_each_label(tree->labels, l)
		if (streq(l->label, label))
			return tree;

	for_each_child(tree, child) {
		node = get_node_by_label(child, label);
		if (node)
			return node;
	}

	return NULL;
}

struct node *get_node_by_phandle(struct node *tree, cell_t phandle)
{
	struct node *child, *node;

	assert((phandle != 0) && (phandle != -1));

	if (tree->phandle == phandle)
		return tree;

	for_each_child(tree, child) {
		node = get_node_by_phandle(child, phandle);
		if (node)
			return node;
	}

	return NULL;
}

struct node *get_node_by_ref(struct node *tree, const char *ref)
{
	if (ref[0] == '/')
		return get_node_by_path(tree, ref);
	else
		return get_node_by_label(tree, ref);
}

cell_t get_node_phandle(struct node *root, struct node *node)
{
	static cell_t phandle = 1; /* FIXME: ick, static local */

	if ((node->phandle != 0) && (node->phandle != -1))
		return node->phandle;

	while (get_node_by_phandle(root, phandle))
		phandle++;

	node->phandle = phandle;

	if (!get_property(node, "linux,phandle")
	    && (phandle_format & PHANDLE_LEGACY))
		add_property(node,
			     build_property("linux,phandle",
					    data_append_cell(empty_data, phandle)));

	if (!get_property(node, "phandle")
	    && (phandle_format & PHANDLE_EPAPR))
		add_property(node,
			     build_property("phandle",
					    data_append_cell(empty_data, phandle)));

	/* If the node *does* have a phandle property, we must
	 * be dealing with a self-referencing phandle, which will be
	 * fixed up momentarily in the caller */

	return node->phandle;
}

uint32_t guess_boot_cpuid(struct node *tree)
{
	struct node *cpus, *bootcpu;
	struct property *reg;

	cpus = get_node_by_path(tree, "/cpus");
	if (!cpus)
		return 0;


	bootcpu = cpus->children;
	if (!bootcpu)
		return 0;

	reg = get_property(bootcpu, "reg");
	if (!reg || (reg->val.len != sizeof(uint32_t)))
		return 0;

	/* FIXME: Sanity check node? */

	return propval_cell(reg);
}