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1893 jermar 1
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <ofw_tree.h>
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#include <ofw.h>
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#include <types.h>
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#include <string.h>
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static ofw_tree_node_t *ofw_tree_node_alloc(void)
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{
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    return NULL;
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}
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static ofw_tree_property_t *ofw_tree_properties_alloc(unsigned count)
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{
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    return NULL;
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}
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static void * ofw_tree_space_alloc(size_t size)
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{
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    return NULL;
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}
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/** Transfer information from one OpenFirmware node into its memory representation.
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 *
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 * Transfer entire information from the OpenFirmware device tree 'current' node to
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 * its memory representation in 'current_node'. This function recursively processes
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 * all node's peers and children.
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 *
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 * @param current_node  Pointer to uninitialized ofw_tree_node structure that will
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 *          become the memory represenation of 'current'.
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 * @param parent_node   Parent ofw_tree_node structure or NULL in case of root node.
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 * @param current   OpenFirmware phandle to the current device tree node.
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 */
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static void ofw_tree_node_process(ofw_tree_node_t *current_node,
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    ofw_tree_node_t *parent_node, phandle current)
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{
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    phandle peer;
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    phandle child;
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    unsigned properties = 0;
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    char name[OFW_TREE_PROPERTY_MAX_NAMELEN];
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    /*
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     * Initialize node.
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     */
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    current_node->parent = parent_node;
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    current_node->peer = NULL;
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    current_node->child = NULL;
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    current_node->properties = 0;
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    current_node->property = NULL;
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    /*
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     * Recursively process the potential peer node.
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     */
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    peer = ofw_get_peer_node(current);
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    if (peer != 0 && peer != -1) {
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        ofw_tree_node_t *peer_node;
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        peer_node = ofw_tree_node_alloc();
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        if (peer_node) {
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            ofw_tree_node_process(peer_node, current_node, peer);
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            current_node->peer = peer_node;
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        }
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    }
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    /*
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     * Recursively process the potential child node.
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     */
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    child = ofw_get_child_node(current);
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    if (child != 0 && child != -1) {
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        ofw_tree_node_t *child_node;
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        child_node = ofw_tree_node_alloc();
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        if (child_node) {
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            ofw_tree_node_process(child_node, current_node, child);
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            current_node->child = child_node;
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        }
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    }
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    /*
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     * Count properties.
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     */
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    name[0] = '\0';
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    while (ofw_next_property(current, name, name) == 1)
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        current_node->properties++;
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    if (!current_node->properties)
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        return;
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    /*
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     * Copy properties.
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     */
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    current_node->property = ofw_tree_properties_alloc(current_node->properties);
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    if (!current_node->property)
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        return;
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    int i = 0;
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    name[0] = '\0';
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    for (i = 0; ofw_next_property(current, name, name) == 1; i++) {
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        size_t size;
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        if (i == current_node->properties)
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            break;
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        strncpy(current_node->property[i].name, name, sizeof(name));
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        size = ofw_get_proplen(current, name);
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        current_node->property[i].size = size;
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        if (size) {
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            void *buf;
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            buf = ofw_tree_space_alloc(size);
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            if (current_node->property[i].value = buf) {
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                /*
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                 * Copy property value to memory node.
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                 */
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                (void) ofw_get_property(current, name, buf, size);
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            }
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        } else {
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            current_node->property[i].value = NULL;
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        }
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    }
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    current_node->properties = i;   /* Just in case we ran out of memory. */
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}
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/** Construct memory representation of OpenFirmware device tree.
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 *
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 * @return NULL on failure or pointer to the root node.
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 */
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ofw_tree_node_t *ofw_tree_build(void)
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{
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    ofw_tree_node_t *root;
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    root = ofw_tree_node_alloc();
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    if (root)
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        ofw_tree_node_process(root, NULL, ofw_root);
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    return root;
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}