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1893 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
1893 jermar 3
 * 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>
1894 jermar 33
#include <balloc.h>
1895 jermar 34
#include <asm.h>
1893 jermar 35
 
1895 jermar 36
#define MAX_PATH_LEN    256
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1893 jermar 38
static ofw_tree_node_t *ofw_tree_node_alloc(void)
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{
1894 jermar 40
    return balloc(sizeof(ofw_tree_node_t), sizeof(ofw_tree_node_t));
1893 jermar 41
}
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43
static ofw_tree_property_t *ofw_tree_properties_alloc(unsigned count)
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{
3797 jermar 45
    return balloc(count * sizeof(ofw_tree_property_t),
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        sizeof(ofw_tree_property_t));
1893 jermar 47
}
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3797 jermar 49
static void *ofw_tree_space_alloc(size_t size)
1893 jermar 50
{
1896 jermar 51
    char *addr;
52
 
53
    /*
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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.
62
     */
63
    addr = balloc(size + 1, size);
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    if (addr)
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        addr[size] = '\0';
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    return addr;
1893 jermar 67
}
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3797 jermar 69
/** Transfer information from one OpenFirmware node into its memory
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 * representation.
1893 jermar 71
 *
3797 jermar 72
 * Transfer entire information from the OpenFirmware device tree 'current' node
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 * to its memory representation in 'current_node'. This function recursively
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 * processes all node's children. Node's peers are processed iteratively in
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 * order to prevent stack from overflowing.
1893 jermar 76
 *
3797 jermar 77
 * @param current_node  Pointer to uninitialized ofw_tree_node structure that
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 *          will become the memory represenation of 'current'.
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 * @param parent_node   Parent ofw_tree_node structure or NULL in case of root
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 *          node.
1893 jermar 81
 * @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,
3797 jermar 84
    ofw_tree_node_t *parent_node, phandle current)
1893 jermar 85
{
3797 jermar 86
    static char path[MAX_PATH_LEN + 1];
1895 jermar 87
    static char name[OFW_TREE_PROPERTY_MAX_NAMELEN];
3796 jermar 88
    static char name2[OFW_TREE_PROPERTY_MAX_NAMELEN];
1893 jermar 89
    phandle peer;
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    phandle child;
1895 jermar 91
    size_t len;
92
    int i;
1893 jermar 93
 
1973 jermar 94
    while (current_node) {
95
        /*
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         * Initialize node.
97
         */
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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;
1893 jermar 105
 
1973 jermar 106
        /*
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         * Get the disambigued name.
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         */
109
        len = ofw_package_to_path(current, path, MAX_PATH_LEN);
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        if (len == -1)
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            return;
1895 jermar 112
 
1973 jermar 113
        path[len] = '\0';
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        for (i = len - 1; i >= 0 && path[i] != '/'; i--)
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            ;
116
        i++;    /* do not include '/' */
1895 jermar 117
 
1973 jermar 118
        len -= i;
119
 
120
        /* add space for trailing '\0' */
121
        current_node->da_name = ofw_tree_space_alloc(len + 1);
122
        if (!current_node->da_name)
123
            return;
1895 jermar 124
 
1973 jermar 125
        memcpy(current_node->da_name, &path[i], len);
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        current_node->da_name[len] = '\0';
1895 jermar 127
 
1973 jermar 128
        /*
129
         * Recursively process the potential child node.
130
         */
131
        child = ofw_get_child_node(current);
132
        if (child != 0 && child != -1) {
133
            ofw_tree_node_t *child_node;
1893 jermar 134
 
1973 jermar 135
            child_node = ofw_tree_node_alloc();
136
            if (child_node) {
3797 jermar 137
                ofw_tree_node_process(child_node, current_node,
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                    child);
1973 jermar 139
                current_node->child = child_node;
140
            }
1893 jermar 141
        }
142
 
1973 jermar 143
        /*
144
         * Count properties.
145
         */
146
        name[0] = '\0';
3796 jermar 147
        while (ofw_next_property(current, name, name2) == 1) {
1973 jermar 148
            current_node->properties++;
3796 jermar 149
            memcpy(name, name2, OFW_TREE_PROPERTY_MAX_NAMELEN);
150
        }
151
 
1973 jermar 152
        if (!current_node->properties)
153
            return;
1893 jermar 154
 
1973 jermar 155
        /*
156
         * Copy properties.
157
         */
3797 jermar 158
        current_node->property =
159
            ofw_tree_properties_alloc(current_node->properties);
1973 jermar 160
        if (!current_node->property)
161
            return;
1893 jermar 162
 
1973 jermar 163
        name[0] = '\0';
3796 jermar 164
        for (i = 0; ofw_next_property(current, name, name2) == 1; i++) {
1973 jermar 165
            size_t size;
1893 jermar 166
 
1973 jermar 167
            if (i == current_node->properties)
168
                break;
1893 jermar 169
 
3796 jermar 170
            memcpy(name, name2, OFW_TREE_PROPERTY_MAX_NAMELEN);
1973 jermar 171
            memcpy(current_node->property[i].name, name,
3797 jermar 172
                OFW_TREE_PROPERTY_MAX_NAMELEN);
173
            current_node->property[i].name[
174
                OFW_TREE_PROPERTY_MAX_NAMELEN] = '\0';
1893 jermar 175
 
1973 jermar 176
            size = ofw_get_proplen(current, name);
177
            current_node->property[i].size = size;
178
            if (size) {
179
                void *buf;
1893 jermar 180
 
1973 jermar 181
                buf = ofw_tree_space_alloc(size);
182
                if (current_node->property[i].value = buf) {
183
                    /*
184
                     * Copy property value to memory node.
185
                     */
3797 jermar 186
                    (void) ofw_get_property(current, name,
187
                        buf, size);
1973 jermar 188
                }
189
            } else {
190
                current_node->property[i].value = NULL;
191
            }
192
        }
193
 
3797 jermar 194
        /* Just in case we ran out of memory. */
195
        current_node->properties = i;
1973 jermar 196
 
197
        /*
198
         * Iteratively process the next peer node.
199
         * Note that recursion is a bad idea here.
200
         * Due to the topology of the OpenFirmware device tree,
201
         * the nesting of peer nodes could be to wide and the
202
         * risk of overflowing the stack is too real.
203
         */
204
        peer = ofw_get_peer_node(current);
205
        if (peer != 0 && peer != -1) {
206
            ofw_tree_node_t *peer_node;
207
 
208
            peer_node = ofw_tree_node_alloc();
209
            if (peer_node) {
210
                current_node->peer = peer_node;
211
                current_node = peer_node;
212
                current = peer;
1893 jermar 213
                /*
1973 jermar 214
                 * Process the peer in next iteration.
1893 jermar 215
                 */
1973 jermar 216
                continue;
1893 jermar 217
            }
218
        }
1973 jermar 219
        /*
220
         * No more peers on this level.
221
         */
222
        break;
1893 jermar 223
    }
224
}
225
 
226
/** Construct memory representation of OpenFirmware device tree.
227
 *
3797 jermar 228
 * @return      NULL on failure or pointer to the root node.
1893 jermar 229
 */
230
ofw_tree_node_t *ofw_tree_build(void)
231
{
232
    ofw_tree_node_t *root;
3672 jermar 233
    phandle ssm_node;
234
    ofw_tree_node_t *ssm;
1893 jermar 235
 
236
    root = ofw_tree_node_alloc();
237
    if (root)
238
        ofw_tree_node_process(root, NULL, ofw_root);
3672 jermar 239
 
240
    /*
241
     * The firmware client interface does not automatically include the
242
     * "ssm" node in the list of children of "/". A nasty yet working
243
     * solution is to explicitly stick "ssm" to the OFW tree.
244
     */
245
    ssm_node = ofw_find_device("/ssm@0,0");
246
    if (ssm_node != -1) {
247
        ssm = ofw_tree_node_alloc();
248
        if (ssm) {
3797 jermar 249
            ofw_tree_node_process(ssm, root,
250
                ofw_find_device("/ssm@0,0"));
3672 jermar 251
            ssm->peer = root->child;
252
            root->child = ssm;
253
        }
254
    }
1893 jermar 255
 
256
    return root;
257
}