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| Rev | Author | Line No. | Line |
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| 1894 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup ofw |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** |
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| 33 | * @file |
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| 34 | * @brief OpenFirmware device tree navigation. |
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| 35 | * |
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| 36 | */ |
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| 37 | |||
| 1895 | jermar | 38 | #include <genarch/ofw/ofw_tree.h> |
| 39 | #include <arch/memstr.h> |
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| 40 | #include <func.h> |
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| 41 | #include <print.h> |
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| 42 | #include <panic.h> |
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| 43 | |||
| 44 | #define PATH_MAX_LEN 80 |
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| 45 | #define NAME_BUF_LEN 50 |
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| 46 | |||
| 47 | static ofw_tree_node_t *ofw_root; |
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| 48 | |||
| 49 | void ofw_tree_init(ofw_tree_node_t *root) |
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| 50 | { |
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| 51 | ofw_root = root; |
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| 52 | } |
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| 53 | |||
| 54 | /** Return value of the 'name' property. |
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| 55 | * |
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| 56 | * @param node Node of interest. |
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| 57 | * |
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| 58 | * @return Value of the 'name' property belonging to the node. |
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| 59 | */ |
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| 60 | const char *ofw_tree_node_name(const ofw_tree_node_t *node) |
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| 61 | { |
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| 62 | int i; |
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| 63 | |||
| 64 | for (i = 0; i < node->properties; i++) { |
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| 65 | if (strncmp(node->property[i].name, "name", strlen("name")) == 0) { |
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| 66 | if (node->property[i].size < 2) |
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| 67 | panic("Invalid name property.\n"); |
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| 68 | return node->property[i].value; |
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| 69 | } |
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| 70 | } |
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| 71 | |||
| 72 | panic("Node without name property.\n"); |
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| 73 | } |
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| 74 | |||
| 75 | /** Lookup child of given name. |
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| 76 | * |
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| 77 | * @param node Node whose child is being looked up. |
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| 78 | * @param da_name Disambigued name of the child being looked up. |
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| 79 | * |
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| 80 | * @return NULL if there is no such child or pointer to the matching child node. |
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| 81 | */ |
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| 82 | static ofw_tree_node_t *ofw_tree_find_child(ofw_tree_node_t *node, const char *da_name) |
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| 83 | { |
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| 84 | ofw_tree_node_t *cur; |
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| 85 | |||
| 86 | for (cur = node->child; cur; cur = cur->peer) { |
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| 87 | if (strncmp(cur->da_name, da_name, strlen(da_name)) == 0) |
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| 88 | return cur; |
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| 89 | } |
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| 90 | |||
| 91 | return NULL; |
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| 92 | } |
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| 93 | |||
| 94 | /** Lookup OpenFirmware node by its path. |
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| 95 | * |
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| 96 | * @param path Path to the node. |
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| 97 | * |
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| 98 | * @return NULL if there is no such node or pointer to the leaf node. |
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| 99 | */ |
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| 100 | ofw_tree_node_t *ofw_tree_lookup(const char *path) |
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| 101 | { |
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| 102 | char buf[NAME_BUF_LEN+1]; |
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| 103 | ofw_tree_node_t *node = ofw_root; |
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| 104 | index_t i, j; |
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| 105 | |||
| 106 | if (path[0] != '/') |
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| 107 | return NULL; |
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| 108 | |||
| 109 | for (i = 1; i < strlen(path) && node; i = j + 1) { |
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| 110 | for (j = i; j < strlen(path) && path[j] != '/'; j++) |
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| 111 | ; |
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| 112 | if (i == j) /* skip extra slashes */ |
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| 113 | continue; |
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| 114 | |||
| 115 | memcpy(buf, &path[i], j - i); |
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| 116 | buf[j - i] = '\0'; |
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| 117 | node = ofw_tree_find_child(node, buf); |
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| 118 | } |
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| 119 | |||
| 120 | return node; |
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| 121 | } |
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| 122 | |||
| 123 | /** Recursively print subtree rooted in a node. |
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| 124 | * |
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| 125 | * @param node Root of the subtree. |
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| 126 | * @param path Current path, NULL for the very root of the entire tree. |
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| 127 | */ |
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| 128 | static void ofw_tree_node_print(const ofw_tree_node_t *node, const char *path) |
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| 129 | { |
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| 130 | char p[PATH_MAX_LEN]; |
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| 131 | |||
| 132 | if (node->parent) { |
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| 133 | snprintf(p, PATH_MAX_LEN, "%s/%s", path, node->da_name); |
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| 134 | printf("%s\n", p); |
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| 135 | } else { |
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| 136 | snprintf(p, PATH_MAX_LEN, "%s", node->da_name); |
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| 137 | printf("/\n"); |
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| 138 | } |
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| 139 | |||
| 140 | if (node->child) |
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| 141 | ofw_tree_node_print(node->child, p); |
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| 142 | |||
| 143 | if (node->peer) |
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| 144 | ofw_tree_node_print(node->peer, path); |
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| 145 | } |
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| 146 | |||
| 147 | /** Print the structure of the OpenFirmware device tree. */ |
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| 148 | void ofw_tree_print(void) |
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| 149 | { |
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| 150 | ofw_tree_node_print(ofw_root, NULL); |
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| 151 | } |
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| 152 | |||
| 1894 | jermar | 153 | /** @} |
| 154 | */ |