0,0 → 1,272 |
/* |
* Copyright (c) 2006 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup ofw |
* @{ |
*/ |
/** |
* @file |
* @brief OpenFirmware device tree navigation. |
* |
*/ |
|
#include <genarch/ofw/ofw_tree.h> |
#include <arch/memstr.h> |
#include <mm/slab.h> |
#include <func.h> |
#include <print.h> |
#include <panic.h> |
|
#define PATH_MAX_LEN 80 |
#define NAME_BUF_LEN 50 |
|
static ofw_tree_node_t *ofw_root; |
|
void ofw_tree_init(ofw_tree_node_t *root) |
{ |
ofw_root = root; |
} |
|
/** Get OpenFirmware node property. |
* |
* @param node Node in which to lookup the property. |
* @param name Name of the property. |
* |
* @return Pointer to the property structure or NULL if no such property. |
*/ |
ofw_tree_property_t *ofw_tree_getprop(const ofw_tree_node_t *node, const char *name) |
{ |
unsigned int i; |
|
for (i = 0; i < node->properties; i++) { |
if (strcmp(node->property[i].name, name) == 0) |
return &node->property[i]; |
} |
|
return NULL; |
} |
|
/** Return value of the 'name' property. |
* |
* @param node Node of interest. |
* |
* @return Value of the 'name' property belonging to the node. |
*/ |
const char *ofw_tree_node_name(const ofw_tree_node_t *node) |
{ |
ofw_tree_property_t *prop; |
|
prop = ofw_tree_getprop(node, "name"); |
if (!prop) |
panic("Node without name property.\n"); |
|
if (prop->size < 2) |
panic("Invalid name property.\n"); |
|
return prop->value; |
} |
|
/** Lookup child of given name. |
* |
* @param node Node whose child is being looked up. |
* @param name Name of the child being looked up. |
* |
* @return NULL if there is no such child or pointer to the matching child node. |
*/ |
ofw_tree_node_t *ofw_tree_find_child(ofw_tree_node_t *node, const char *name) |
{ |
ofw_tree_node_t *cur; |
|
/* |
* Try to find the disambigued name. |
*/ |
for (cur = node->child; cur; cur = cur->peer) { |
if (strcmp(cur->da_name, name) == 0) |
return cur; |
} |
|
/* |
* Disambigued name not found. |
* Lets try our luck with possibly ambiguous "name" property. |
* |
* We need to do this because paths stored in "/aliases" |
* are not always fully-qualified. |
*/ |
for (cur = node->child; cur; cur = cur->peer) { |
if (strcmp(ofw_tree_node_name(cur), name) == 0) |
return cur; |
} |
|
return NULL; |
} |
|
/** Lookup first child of given device type. |
* |
* @param node Node whose child is being looked up. |
* @param name Device type of the child being looked up. |
* |
* @return NULL if there is no such child or pointer to the matching child node. |
*/ |
ofw_tree_node_t *ofw_tree_find_child_by_device_type(ofw_tree_node_t *node, const char *name) |
{ |
ofw_tree_node_t *cur; |
ofw_tree_property_t *prop; |
|
for (cur = node->child; cur; cur = cur->peer) { |
prop = ofw_tree_getprop(cur, "device_type"); |
if (!prop || !prop->value) |
continue; |
if (strcmp(prop->value, name) == 0) |
return cur; |
} |
|
return NULL; |
} |
|
/** Lookup node with matching node_handle. |
* |
* Child nodes are looked up recursively contrary to peer nodes that |
* are looked up iteratively to avoid stack overflow. |
* |
* @param root Root of the searched subtree. |
* @param handle OpenFirmware handle. |
* |
* @return NULL if there is no such node or pointer to the matching node. |
*/ |
ofw_tree_node_t *ofw_tree_find_node_by_handle(ofw_tree_node_t *root, uint32_t handle) |
{ |
ofw_tree_node_t *cur; |
|
for (cur = root; cur; cur = cur->peer) { |
if (cur->node_handle == handle) |
return cur; |
|
if (cur->child) { |
ofw_tree_node_t *node; |
|
node = ofw_tree_find_node_by_handle(cur->child, handle); |
if (node) |
return node; |
} |
} |
|
return NULL; |
} |
|
/** Lookup first peer of given device type. |
* |
* @param node Node whose peer is being looked up. |
* @param name Device type of the child being looked up. |
* |
* @return NULL if there is no such child or pointer to the matching child node. |
*/ |
ofw_tree_node_t *ofw_tree_find_peer_by_device_type(ofw_tree_node_t *node, const char *name) |
{ |
ofw_tree_node_t *cur; |
ofw_tree_property_t *prop; |
|
for (cur = node->peer; cur; cur = cur->peer) { |
prop = ofw_tree_getprop(cur, "device_type"); |
if (!prop || !prop->value) |
continue; |
if (strcmp(prop->value, name) == 0) |
return cur; |
} |
|
return NULL; |
} |
|
|
/** Lookup OpenFirmware node by its path. |
* |
* @param path Path to the node. |
* |
* @return NULL if there is no such node or pointer to the leaf node. |
*/ |
ofw_tree_node_t *ofw_tree_lookup(const char *path) |
{ |
char buf[NAME_BUF_LEN+1]; |
ofw_tree_node_t *node = ofw_root; |
index_t i, j; |
|
if (path[0] != '/') |
return NULL; |
|
for (i = 1; i < strlen(path) && node; i = j + 1) { |
for (j = i; j < strlen(path) && path[j] != '/'; j++) |
; |
if (i == j) /* skip extra slashes */ |
continue; |
|
memcpy(buf, &path[i], j - i); |
buf[j - i] = '\0'; |
node = ofw_tree_find_child(node, buf); |
} |
|
return node; |
} |
|
/** Print OpenFirmware device subtree rooted in a node. |
* |
* Child nodes are processed recursively and peer nodes are processed |
* iteratively in order to avoid stack overflow. |
* |
* @param node Root of the subtree. |
* @param path Current path, NULL for the very root of the entire tree. |
*/ |
static void ofw_tree_node_print(const ofw_tree_node_t *node, const char *path) |
{ |
char *p; |
const ofw_tree_node_t *cur; |
|
p = (char *) malloc(PATH_MAX_LEN, 0); |
|
for (cur = node; cur; cur = cur->peer) { |
if (cur->parent) { |
snprintf(p, PATH_MAX_LEN, "%s/%s", path, cur->da_name); |
printf("%s\n", p); |
} else { |
snprintf(p, PATH_MAX_LEN, "%s", cur->da_name); |
printf("/\n"); |
} |
|
if (cur->child) |
ofw_tree_node_print(cur->child, p); |
} |
|
free(p); |
} |
|
/** Print the structure of the OpenFirmware device tree. */ |
void ofw_tree_print(void) |
{ |
ofw_tree_node_print(ofw_root, NULL); |
} |
|
/** @} |
*/ |