projects/linux·blob v3.2 · refs

609 lines · 11.9 KiB

1/*
2 * (C) Copyright David Gibson <[email protected]>, IBM Corporation. 2005.
3 *
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#include "dtc.h"
22
23/*
24 * Tree building functions
25 */
26
27void add_label(struct label **labels, char *label)
28{
29 struct label *new;
30
31 /* Make sure the label isn't already there */
32 for_each_label(*labels, new)
33 if (streq(new->label, label))
34 return;
35
36 new = xmalloc(sizeof(*new));
37 new->label = label;
38 new->next = *labels;
39 *labels = new;
40}
41
42struct property *build_property(char *name, struct data val)
43{
44 struct property *new = xmalloc(sizeof(*new));
45
46 memset(new, 0, sizeof(*new));
47
48 new->name = name;
49 new->val = val;
50
51 return new;
52}
53
54struct property *chain_property(struct property *first, struct property *list)
55{
56 assert(first->next == NULL);
57
58 first->next = list;
59 return first;
60}
61
62struct property *reverse_properties(struct property *first)
63{
64 struct property *p = first;
65 struct property *head = NULL;
66 struct property *next;
67
68 while (p) {
69 next = p->next;
70 p->next = head;
71 head = p;
72 p = next;
73 }
74 return head;
75}
76
77struct node *build_node(struct property *proplist, struct node *children)
78{
79 struct node *new = xmalloc(sizeof(*new));
80 struct node *child;
81
82 memset(new, 0, sizeof(*new));
83
84 new->proplist = reverse_properties(proplist);
85 new->children = children;
86
87 for_each_child(new, child) {
88 child->parent = new;
89 }
90
91 return new;
92}
93
94struct node *name_node(struct node *node, char *name)
95{
96 assert(node->name == NULL);
97
98 node->name = name;
99
100 return node;
101}
102
103struct node *merge_nodes(struct node *old_node, struct node *new_node)
104{
105 struct property *new_prop, *old_prop;
106 struct node *new_child, *old_child;
107 struct label *l;
108
109 /* Add new node labels to old node */
110 for_each_label(new_node->labels, l)
111 add_label(&old_node->labels, l->label);
112
113 /* Move properties from the new node to the old node. If there
114 * is a collision, replace the old value with the new */
115 while (new_node->proplist) {
116 /* Pop the property off the list */
117 new_prop = new_node->proplist;
118 new_node->proplist = new_prop->next;
119 new_prop->next = NULL;
120
121 /* Look for a collision, set new value if there is */
122 for_each_property(old_node, old_prop) {
123 if (streq(old_prop->name, new_prop->name)) {
124 /* Add new labels to old property */
125 for_each_label(new_prop->labels, l)
126 add_label(&old_prop->labels, l->label);
127
128 old_prop->val = new_prop->val;
129 free(new_prop);
130 new_prop = NULL;
131 break;
132 }
133 }
134
135 /* if no collision occurred, add property to the old node. */
136 if (new_prop)
137 add_property(old_node, new_prop);
138 }
139
140 /* Move the override child nodes into the primary node. If
141 * there is a collision, then merge the nodes. */
142 while (new_node->children) {
143 /* Pop the child node off the list */
144 new_child = new_node->children;
145 new_node->children = new_child->next_sibling;
146 new_child->parent = NULL;
147 new_child->next_sibling = NULL;
148
149 /* Search for a collision. Merge if there is */
150 for_each_child(old_node, old_child) {
151 if (streq(old_child->name, new_child->name)) {
152 merge_nodes(old_child, new_child);
153 new_child = NULL;
154 break;
155 }
156 }
157
158 /* if no collision occurred, add child to the old node. */
159 if (new_child)
160 add_child(old_node, new_child);
161 }
162
163 /* The new node contents are now merged into the old node. Free
164 * the new node. */
165 free(new_node);
166
167 return old_node;
168}
169
170struct node *chain_node(struct node *first, struct node *list)
171{
172 assert(first->next_sibling == NULL);
173
174 first->next_sibling = list;
175 return first;
176}
177
178void add_property(struct node *node, struct property *prop)
179{
180 struct property **p;
181
182 prop->next = NULL;
183
184 p = &node->proplist;
185 while (*p)
186 p = &((*p)->next);
187
188 *p = prop;
189}
190
191void add_child(struct node *parent, struct node *child)
192{
193 struct node **p;
194
195 child->next_sibling = NULL;
196 child->parent = parent;
197
198 p = &parent->children;
199 while (*p)
200 p = &((*p)->next_sibling);
201
202 *p = child;
203}
204
205struct reserve_info *build_reserve_entry(uint64_t address, uint64_t size)
206{
207 struct reserve_info *new = xmalloc(sizeof(*new));
208
209 memset(new, 0, sizeof(*new));
210
211 new->re.address = address;
212 new->re.size = size;
213
214 return new;
215}
216
217struct reserve_info *chain_reserve_entry(struct reserve_info *first,
218 struct reserve_info *list)
219{
220 assert(first->next == NULL);
221
222 first->next = list;
223 return first;
224}
225
226struct reserve_info *add_reserve_entry(struct reserve_info *list,
227 struct reserve_info *new)
228{
229 struct reserve_info *last;
230
231 new->next = NULL;
232
233 if (! list)
234 return new;
235
236 for (last = list; last->next; last = last->next)
237 ;
238
239 last->next = new;
240
241 return list;
242}
243
244struct boot_info *build_boot_info(struct reserve_info *reservelist,
245 struct node *tree, uint32_t boot_cpuid_phys)
246{
247 struct boot_info *bi;
248
249 bi = xmalloc(sizeof(*bi));
250 bi->reservelist = reservelist;
251 bi->dt = tree;
252 bi->boot_cpuid_phys = boot_cpuid_phys;
253
254 return bi;
255}
256
257/*
258 * Tree accessor functions
259 */
260
261const char *get_unitname(struct node *node)
262{
263 if (node->name[node->basenamelen] == '\0')
264 return "";
265 else
266 return node->name + node->basenamelen + 1;
267}
268
269struct property *get_property(struct node *node, const char *propname)
270{
271 struct property *prop;
272
273 for_each_property(node, prop)
274 if (streq(prop->name, propname))
275 return prop;
276
277 return NULL;
278}
279
280cell_t propval_cell(struct property *prop)
281{
282 assert(prop->val.len == sizeof(cell_t));
283 return fdt32_to_cpu(*((cell_t *)prop->val.val));
284}
285
286struct property *get_property_by_label(struct node *tree, const char *label,
287 struct node **node)
288{
289 struct property *prop;
290 struct node *c;
291
292 *node = tree;
293
294 for_each_property(tree, prop) {
295 struct label *l;
296
297 for_each_label(prop->labels, l)
298 if (streq(l->label, label))
299 return prop;
300 }
301
302 for_each_child(tree, c) {
303 prop = get_property_by_label(c, label, node);
304 if (prop)
305 return prop;
306 }
307
308 *node = NULL;
309 return NULL;
310}
311
312struct marker *get_marker_label(struct node *tree, const char *label,
313 struct node **node, struct property **prop)
314{
315 struct marker *m;
316 struct property *p;
317 struct node *c;
318
319 *node = tree;
320
321 for_each_property(tree, p) {
322 *prop = p;
323 m = p->val.markers;
324 for_each_marker_of_type(m, LABEL)
325 if (streq(m->ref, label))
326 return m;
327 }
328
329 for_each_child(tree, c) {
330 m = get_marker_label(c, label, node, prop);
331 if (m)
332 return m;
333 }
334
335 *prop = NULL;
336 *node = NULL;
337 return NULL;
338}
339
340struct node *get_subnode(struct node *node, const char *nodename)
341{
342 struct node *child;
343
344 for_each_child(node, child)
345 if (streq(child->name, nodename))
346 return child;
347
348 return NULL;
349}
350
351struct node *get_node_by_path(struct node *tree, const char *path)
352{
353 const char *p;
354 struct node *child;
355
356 if (!path || ! (*path))
357 return tree;
358
359 while (path[0] == '/')
360 path++;
361
362 p = strchr(path, '/');
363
364 for_each_child(tree, child) {
365 if (p && strneq(path, child->name, p-path))
366 return get_node_by_path(child, p+1);
367 else if (!p && streq(path, child->name))
368 return child;
369 }
370
371 return NULL;
372}
373
374struct node *get_node_by_label(struct node *tree, const char *label)
375{
376 struct node *child, *node;
377 struct label *l;
378
379 assert(label && (strlen(label) > 0));
380
381 for_each_label(tree->labels, l)
382 if (streq(l->label, label))
383 return tree;
384
385 for_each_child(tree, child) {
386 node = get_node_by_label(child, label);
387 if (node)
388 return node;
389 }
390
391 return NULL;
392}
393
394struct node *get_node_by_phandle(struct node *tree, cell_t phandle)
395{
396 struct node *child, *node;
397
398 assert((phandle != 0) && (phandle != -1));
399
400 if (tree->phandle == phandle)
401 return tree;
402
403 for_each_child(tree, child) {
404 node = get_node_by_phandle(child, phandle);
405 if (node)
406 return node;
407 }
408
409 return NULL;
410}
411
412struct node *get_node_by_ref(struct node *tree, const char *ref)
413{
414 if (ref[0] == '/')
415 return get_node_by_path(tree, ref);
416 else
417 return get_node_by_label(tree, ref);
418}
419
420cell_t get_node_phandle(struct node *root, struct node *node)
421{
422 static cell_t phandle = 1; /* FIXME: ick, static local */
423
424 if ((node->phandle != 0) && (node->phandle != -1))
425 return node->phandle;
426
427 while (get_node_by_phandle(root, phandle))
428 phandle++;
429
430 node->phandle = phandle;
431
432 if (!get_property(node, "linux,phandle")
433 && (phandle_format & PHANDLE_LEGACY))
434 add_property(node,
435 build_property("linux,phandle",
436 data_append_cell(empty_data, phandle)));
437
438 if (!get_property(node, "phandle")
439 && (phandle_format & PHANDLE_EPAPR))
440 add_property(node,
441 build_property("phandle",
442 data_append_cell(empty_data, phandle)));
443
444 /* If the node *does* have a phandle property, we must
445 * be dealing with a self-referencing phandle, which will be
446 * fixed up momentarily in the caller */
447
448 return node->phandle;
449}
450
451uint32_t guess_boot_cpuid(struct node *tree)
452{
453 struct node *cpus, *bootcpu;
454 struct property *reg;
455
456 cpus = get_node_by_path(tree, "/cpus");
457 if (!cpus)
458 return 0;
459
460
461 bootcpu = cpus->children;
462 if (!bootcpu)
463 return 0;
464
465 reg = get_property(bootcpu, "reg");
466 if (!reg || (reg->val.len != sizeof(uint32_t)))
467 return 0;
468
469 /* FIXME: Sanity check node? */
470
471 return propval_cell(reg);
472}
473
474static int cmp_reserve_info(const void *ax, const void *bx)
475{
476 const struct reserve_info *a, *b;
477
478 a = *((const struct reserve_info * const *)ax);
479 b = *((const struct reserve_info * const *)bx);
480
481 if (a->re.address < b->re.address)
482 return -1;
483 else if (a->re.address > b->re.address)
484 return 1;
485 else if (a->re.size < b->re.size)
486 return -1;
487 else if (a->re.size > b->re.size)
488 return 1;
489 else
490 return 0;
491}
492
493static void sort_reserve_entries(struct boot_info *bi)
494{
495 struct reserve_info *ri, **tbl;
496 int n = 0, i = 0;
497
498 for (ri = bi->reservelist;
499 ri;
500 ri = ri->next)
501 n++;
502
503 if (n == 0)
504 return;
505
506 tbl = xmalloc(n * sizeof(*tbl));
507
508 for (ri = bi->reservelist;
509 ri;
510 ri = ri->next)
511 tbl[i++] = ri;
512
513 qsort(tbl, n, sizeof(*tbl), cmp_reserve_info);
514
515 bi->reservelist = tbl[0];
516 for (i = 0; i < (n-1); i++)
517 tbl[i]->next = tbl[i+1];
518 tbl[n-1]->next = NULL;
519
520 free(tbl);
521}
522
523static int cmp_prop(const void *ax, const void *bx)
524{
525 const struct property *a, *b;
526
527 a = *((const struct property * const *)ax);
528 b = *((const struct property * const *)bx);
529
530 return strcmp(a->name, b->name);
531}
532
533static void sort_properties(struct node *node)
534{
535 int n = 0, i = 0;
536 struct property *prop, **tbl;
537
538 for_each_property(node, prop)
539 n++;
540
541 if (n == 0)
542 return;
543
544 tbl = xmalloc(n * sizeof(*tbl));
545
546 for_each_property(node, prop)
547 tbl[i++] = prop;
548
549 qsort(tbl, n, sizeof(*tbl), cmp_prop);
550
551 node->proplist = tbl[0];
552 for (i = 0; i < (n-1); i++)
553 tbl[i]->next = tbl[i+1];
554 tbl[n-1]->next = NULL;
555
556 free(tbl);
557}
558
559static int cmp_subnode(const void *ax, const void *bx)
560{
561 const struct node *a, *b;
562
563 a = *((const struct node * const *)ax);
564 b = *((const struct node * const *)bx);
565
566 return strcmp(a->name, b->name);
567}
568
569static void sort_subnodes(struct node *node)
570{
571 int n = 0, i = 0;
572 struct node *subnode, **tbl;
573
574 for_each_child(node, subnode)
575 n++;
576
577 if (n == 0)
578 return;
579
580 tbl = xmalloc(n * sizeof(*tbl));
581
582 for_each_child(node, subnode)
583 tbl[i++] = subnode;
584
585 qsort(tbl, n, sizeof(*tbl), cmp_subnode);
586
587 node->children = tbl[0];
588 for (i = 0; i < (n-1); i++)
589 tbl[i]->next_sibling = tbl[i+1];
590 tbl[n-1]->next_sibling = NULL;
591
592 free(tbl);
593}
594
595static void sort_node(struct node *node)
596{
597 struct node *c;
598
599 sort_properties(node);
600 sort_subnodes(node);
601 for_each_child(node, c)
602 sort_node(c);
603}
604
605void sort_tree(struct boot_info *bi)
606{
607 sort_reserve_entries(bi);
608 sort_node(bi->dt);
609}