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1893 jermar 1
/*
2071 jermar 2
 * 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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#include <balloc.h>
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#include <asm.h>
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#define MAX_PATH_LEN    256
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static ofw_tree_node_t *ofw_tree_node_alloc(void)
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{
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    return balloc(sizeof(ofw_tree_node_t), sizeof(ofw_tree_node_t));
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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 balloc(count * sizeof(ofw_tree_property_t), sizeof(ofw_tree_property_t));
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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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    char *addr;
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    /*
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     * What we do here is a nasty hack :-)
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     * Problem: string property values that are allocated via this
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     * function typically do not contain the trailing '\0'. This
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     * is very uncomfortable for kernel, which is supposed to deal
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     * with the properties.
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     * Solution: when allocating space via this function, we always
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     * allocate space for the extra '\0' character that we store
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     * behind the requested memory.
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     */
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    addr = balloc(size + 1, size);
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    if (addr)
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        addr[size] = '\0';
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    return addr;
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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 children. Node's peers are processed iteratively in order to prevent
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 * stack from overflowing.
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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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    static char path[MAX_PATH_LEN+1];
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    static char name[OFW_TREE_PROPERTY_MAX_NAMELEN];
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    phandle peer;
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    phandle child;
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    size_t len;
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    int i;
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    while (current_node) {
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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->node_handle = current;
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        current_node->properties = 0;
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        current_node->property = NULL;
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        current_node->device = NULL;
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        /*
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         * Get the disambigued name.
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         */
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        len = ofw_package_to_path(current, path, MAX_PATH_LEN);
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        if (len == -1)
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            return;
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        path[len] = '\0';
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        for (i = len - 1; i >= 0 && path[i] != '/'; i--)
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            ;
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        i++;    /* do not include '/' */
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        len -= i;
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        /* add space for trailing '\0' */
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        current_node->da_name = ofw_tree_space_alloc(len + 1);
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        if (!current_node->da_name)
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            return;
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        memcpy(current_node->da_name, &path[i], len);
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        current_node->da_name[len] = '\0';
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1893 jermar 124
 
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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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        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;
1893 jermar 162
 
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            memcpy(current_node->property[i].name, name,
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                OFW_TREE_PROPERTY_MAX_NAMELEN);
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            current_node->property[i].name[OFW_TREE_PROPERTY_MAX_NAMELEN] = '\0';
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1973 jermar 167
            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;
1893 jermar 171
 
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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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            }
182
        }
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        current_node->properties = i;   /* Just in case we ran out of memory. */
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        /*
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         * Iteratively process the next peer node.
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         * Note that recursion is a bad idea here.
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         * Due to the topology of the OpenFirmware device tree,
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         * the nesting of peer nodes could be to wide and the
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         * risk of overflowing the stack is too real.
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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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                current_node->peer = peer_node;
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                current_node = peer_node;
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                current = peer;
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                /*
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                 * Process the peer in next iteration.
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                 */
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                continue;
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            }
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        }
1973 jermar 208
        /*
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         * No more peers on this level.
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         */
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        break;
1893 jermar 212
    }
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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();
224
    if (root)
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        ofw_tree_node_process(root, NULL, ofw_root);
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    return root;
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}