![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
166 lines
3.8 KiB
C
166 lines
3.8 KiB
C
/*
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* proc_devtree.c - handles /proc/device-tree
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*
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* Copyright 1997 Paul Mackerras
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*/
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <asm/prom.h>
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#include <asm/uaccess.h>
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#ifndef HAVE_ARCH_DEVTREE_FIXUPS
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static inline void set_node_proc_entry(struct device_node *np, struct proc_dir_entry *de)
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{
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}
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static void inline set_node_name_link(struct device_node *np, struct proc_dir_entry *de)
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{
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}
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static void inline set_node_addr_link(struct device_node *np, struct proc_dir_entry *de)
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{
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}
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#endif
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static struct proc_dir_entry *proc_device_tree;
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/*
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* Supply data on a read from /proc/device-tree/node/property.
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*/
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static int property_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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struct property *pp = data;
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int n;
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if (off >= pp->length) {
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*eof = 1;
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return 0;
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}
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n = pp->length - off;
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if (n > count)
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n = count;
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else
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*eof = 1;
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memcpy(page, pp->value + off, n);
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*start = page;
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return n;
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}
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/*
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* For a node with a name like "gc@10", we make symlinks called "gc"
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* and "@10" to it.
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*/
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/*
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* Process a node, adding entries for its children and its properties.
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*/
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void proc_device_tree_add_node(struct device_node *np, struct proc_dir_entry *de)
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{
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struct property *pp;
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struct proc_dir_entry *ent;
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struct device_node *child, *sib;
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const char *p, *at;
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int l;
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struct proc_dir_entry *list, **lastp, *al;
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set_node_proc_entry(np, de);
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lastp = &list;
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for (pp = np->properties; pp != 0; pp = pp->next) {
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/*
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* Unfortunately proc_register puts each new entry
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* at the beginning of the list. So we rearrange them.
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*/
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ent = create_proc_read_entry(pp->name, strncmp(pp->name, "security-", 9) ?
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S_IRUGO : S_IRUSR, de, property_read_proc, pp);
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if (ent == 0)
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break;
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if (!strncmp(pp->name, "security-", 9))
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ent->size = 0; /* don't leak number of password chars */
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else
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ent->size = pp->length;
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*lastp = ent;
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lastp = &ent->next;
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}
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child = NULL;
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while ((child = of_get_next_child(np, child))) {
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p = strrchr(child->full_name, '/');
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if (!p)
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p = child->full_name;
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else
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++p;
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/* chop off '@0' if the name ends with that */
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l = strlen(p);
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if (l > 2 && p[l-2] == '@' && p[l-1] == '0')
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l -= 2;
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ent = proc_mkdir(p, de);
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if (ent == 0)
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break;
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*lastp = ent;
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lastp = &ent->next;
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proc_device_tree_add_node(child, ent);
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/*
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* If we left the address part on the name, consider
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* adding symlinks from the name and address parts.
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*/
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if (p[l] != 0 || (at = strchr(p, '@')) == 0)
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continue;
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/*
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* If this is the first node with a given name property,
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* add a symlink with the name property as its name.
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*/
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sib = NULL;
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while ((sib = of_get_next_child(np, sib)) && sib != child)
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if (sib->name && strcmp(sib->name, child->name) == 0)
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break;
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if (sib == child && strncmp(p, child->name, l) != 0) {
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al = proc_symlink(child->name, de, ent->name);
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if (al == 0) {
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of_node_put(sib);
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break;
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}
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set_node_name_link(child, al);
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*lastp = al;
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lastp = &al->next;
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}
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of_node_put(sib);
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/*
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* Add another directory with the @address part as its name.
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*/
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al = proc_symlink(at, de, ent->name);
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if (al == 0)
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break;
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set_node_addr_link(child, al);
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*lastp = al;
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lastp = &al->next;
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}
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of_node_put(child);
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*lastp = NULL;
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de->subdir = list;
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}
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/*
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* Called on initialization to set up the /proc/device-tree subtree
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*/
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void proc_device_tree_init(void)
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{
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struct device_node *root;
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if ( !have_of )
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return;
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proc_device_tree = proc_mkdir("device-tree", NULL);
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if (proc_device_tree == 0)
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return;
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root = of_find_node_by_path("/");
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if (root == 0) {
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printk(KERN_ERR "/proc/device-tree: can't find root\n");
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return;
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}
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proc_device_tree_add_node(root, proc_device_tree);
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of_node_put(root);
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}
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