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>
1894	jermar	33	#include <balloc.h>
1893	jermar	34
		35	static ofw_tree_node_t *ofw_tree_node_alloc(void)
		36	{
1894	jermar	37	return balloc(sizeof(ofw_tree_node_t), sizeof(ofw_tree_node_t));
1893	jermar	38	}
		39
		40	static ofw_tree_property_t *ofw_tree_properties_alloc(unsigned count)
		41	{
1894	jermar	42	return balloc(count * sizeof(ofw_tree_property_t), sizeof(ofw_tree_property_t));
1893	jermar	43	}
		44
		45	static void * ofw_tree_space_alloc(size_t size)
		46	{
1894	jermar	47	return balloc(size, size);
1893	jermar	48	}
		49
		50	/** Transfer information from one OpenFirmware node into its memory representation.
		51	*
		52	* Transfer entire information from the OpenFirmware device tree 'current' node to
		53	* its memory representation in 'current_node'. This function recursively processes
		54	* all node's peers and children.
		55	*
		56	* @param current_node Pointer to uninitialized ofw_tree_node structure that will
		57	* become the memory represenation of 'current'.
		58	* @param parent_node Parent ofw_tree_node structure or NULL in case of root node.
		59	* @param current OpenFirmware phandle to the current device tree node.
		60	*/
		61	static void ofw_tree_node_process(ofw_tree_node_t *current_node,
		62	ofw_tree_node_t *parent_node, phandle current)
		63	{
		64	phandle peer;
		65	phandle child;
		66	unsigned properties = 0;
		67	char name[OFW_TREE_PROPERTY_MAX_NAMELEN];
		68
		69	/*
		70	* Initialize node.
		71	*/
		72	current_node->parent = parent_node;
		73	current_node->peer = NULL;
		74	current_node->child = NULL;
		75	current_node->properties = 0;
		76	current_node->property = NULL;
		77
		78	/*
		79	* Recursively process the potential peer node.
		80	*/
		81	peer = ofw_get_peer_node(current);
		82	if (peer != 0 && peer != -1) {
		83	ofw_tree_node_t *peer_node;
		84
		85	peer_node = ofw_tree_node_alloc();
		86	if (peer_node) {
		87	ofw_tree_node_process(peer_node, current_node, peer);
		88	current_node->peer = peer_node;
		89	}
		90	}
		91
		92	/*
		93	* Recursively process the potential child node.
		94	*/
		95	child = ofw_get_child_node(current);
		96	if (child != 0 && child != -1) {
		97	ofw_tree_node_t *child_node;
		98
		99	child_node = ofw_tree_node_alloc();
		100	if (child_node) {
		101	ofw_tree_node_process(child_node, current_node, child);
		102	current_node->child = child_node;
		103	}
		104	}
		105
		106	/*
		107	* Count properties.
		108	*/
		109	name[0] = '\0';
		110	while (ofw_next_property(current, name, name) == 1)
		111	current_node->properties++;
		112
		113	if (!current_node->properties)
		114	return;
		115
		116	/*
		117	* Copy properties.
		118	*/
		119	current_node->property = ofw_tree_properties_alloc(current_node->properties);
		120	if (!current_node->property)
		121	return;
		122
		123	int i = 0;
		124
		125	name[0] = '\0';
		126	for (i = 0; ofw_next_property(current, name, name) == 1; i++) {
		127	size_t size;
		128
		129	if (i == current_node->properties)
		130	break;
		131
		132	strncpy(current_node->property[i].name, name, sizeof(name));
		133
		134	size = ofw_get_proplen(current, name);
		135	current_node->property[i].size = size;
		136	if (size) {
		137	void *buf;
		138
		139	buf = ofw_tree_space_alloc(size);
		140	if (current_node->property[i].value = buf) {
		141	/*
		142	* Copy property value to memory node.
		143	*/
		144	(void) ofw_get_property(current, name, buf, size);
		145	}
		146	} else {
		147	current_node->property[i].value = NULL;
		148	}
		149	}
		150
		151	current_node->properties = i; /* Just in case we ran out of memory. */
		152	}
		153
		154	/** Construct memory representation of OpenFirmware device tree.
		155	*
		156	* @return NULL on failure or pointer to the root node.
		157	*/
		158	ofw_tree_node_t *ofw_tree_build(void)
		159	{
		160	ofw_tree_node_t *root;
		161
		162	root = ofw_tree_node_alloc();
		163	if (root)
		164	ofw_tree_node_process(root, NULL, ofw_root);
		165
		166	return root;
		167	}

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(root)/trunk/boot/genarch/ofw_tree.c/ – Rev 1894