/proc/device_tree

linux-2.6.28/fs/proc/proc_device.c
/*
* Called on initialization to set up the /proc/device-tree subtree
*/
void __init proc_device_tree_init(void)
{
   struct device_node *root;
   if ( !have_of )
       return;
   proc_device_tree = proc_mkdir("device-tree", NULL);
   if (proc_device_tree == 0)
       return;
   root = of_find_node_by_path("/");
   if (root == 0) {
       printk(KERN_ERR "/proc/device-tree: can't find root\n");
       return;
   }
   proc_device_tree_add_node(root, proc_device_tree);
   of_node_put(root);
}