WebSVN – HelenOS – Blame – //trunk/boot/genarch/ofw_tree.c

Rev	Author	Line No.	Line
1893	jermar	1	/*
		2	* Copyright (C) 2006 Jakub Jermar
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	#include <ofw_tree.h>
		30	#include <ofw.h>
		31	#include <types.h>
		32	#include <string.h>
		33
		34	static ofw_tree_node_t *ofw_tree_node_alloc(void)
		35	{
		36	return NULL;
		37	}
		38
		39	static ofw_tree_property_t *ofw_tree_properties_alloc(unsigned count)
		40	{
		41	return NULL;
		42	}
		43
		44	static void * ofw_tree_space_alloc(size_t size)
		45	{
		46	return NULL;
		47	}
		48
		49	/** Transfer information from one OpenFirmware node into its memory representation.
		50	*
		51	* Transfer entire information from the OpenFirmware device tree 'current' node to
		52	* its memory representation in 'current_node'. This function recursively processes
		53	* all node's peers and children.
		54	*
		55	* @param current_node Pointer to uninitialized ofw_tree_node structure that will
		56	* become the memory represenation of 'current'.
		57	* @param parent_node Parent ofw_tree_node structure or NULL in case of root node.
		58	* @param current OpenFirmware phandle to the current device tree node.
		59	*/
		60	static void ofw_tree_node_process(ofw_tree_node_t *current_node,
		61	ofw_tree_node_t *parent_node, phandle current)
		62	{
		63	phandle peer;
		64	phandle child;
		65	unsigned properties = 0;
		66	char name[OFW_TREE_PROPERTY_MAX_NAMELEN];
		67
		68	/*
		69	* Initialize node.
		70	*/
		71	current_node->parent = parent_node;
		72	current_node->peer = NULL;
		73	current_node->child = NULL;
		74	current_node->properties = 0;
		75	current_node->property = NULL;
		76
		77	/*
		78	* Recursively process the potential peer node.
		79	*/
		80	peer = ofw_get_peer_node(current);
		81	if (peer != 0 && peer != -1) {
		82	ofw_tree_node_t *peer_node;
		83
		84	peer_node = ofw_tree_node_alloc();
		85	if (peer_node) {
		86	ofw_tree_node_process(peer_node, current_node, peer);
		87	current_node->peer = peer_node;
		88	}
		89	}
		90
		91	/*
		92	* Recursively process the potential child node.
		93	*/
		94	child = ofw_get_child_node(current);
		95	if (child != 0 && child != -1) {
		96	ofw_tree_node_t *child_node;
		97
		98	child_node = ofw_tree_node_alloc();
		99	if (child_node) {
		100	ofw_tree_node_process(child_node, current_node, child);
		101	current_node->child = child_node;
		102	}
		103	}
		104
		105	/*
		106	* Count properties.
		107	*/
		108	name[0] = '\0';
		109	while (ofw_next_property(current, name, name) == 1)
		110	current_node->properties++;
		111
		112	if (!current_node->properties)
		113	return;
		114
		115	/*
		116	* Copy properties.
		117	*/
		118	current_node->property = ofw_tree_properties_alloc(current_node->properties);
		119	if (!current_node->property)
		120	return;
		121
		122	int i = 0;
		123
		124	name[0] = '\0';
		125	for (i = 0; ofw_next_property(current, name, name) == 1; i++) {
		126	size_t size;
		127
		128	if (i == current_node->properties)
		129	break;
		130
		131	strncpy(current_node->property[i].name, name, sizeof(name));
		132
		133	size = ofw_get_proplen(current, name);
		134	current_node->property[i].size = size;
		135	if (size) {
		136	void *buf;
		137
		138	buf = ofw_tree_space_alloc(size);
		139	if (current_node->property[i].value = buf) {
		140	/*
		141	* Copy property value to memory node.
		142	*/
		143	(void) ofw_get_property(current, name, buf, size);
		144	}
		145	} else {
		146	current_node->property[i].value = NULL;
		147	}
		148	}
		149
		150	current_node->properties = i; /* Just in case we ran out of memory. */
		151	}
		152
		153	/** Construct memory representation of OpenFirmware device tree.
		154	*
		155	* @return NULL on failure or pointer to the root node.
		156	*/
		157	ofw_tree_node_t *ofw_tree_build(void)
		158	{
		159	ofw_tree_node_t *root;
		160
		161	root = ofw_tree_node_alloc();
		162	if (root)
		163	ofw_tree_node_process(root, NULL, ofw_root);
		164
		165	return root;
		166	}

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(root)//trunk/boot/genarch/ofw_tree.c – Rev 1893