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e169cfbe GL |
1 | /* |
2 | * Functions for working with the Flattened Device Tree data format | |
3 | * | |
4 | * Copyright 2009 Benjamin Herrenschmidt, IBM Corp | |
5 | * benh@kernel.crashing.org | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | */ | |
11 | ||
41f88009 GL |
12 | #include <linux/kernel.h> |
13 | #include <linux/lmb.h> | |
f7b3a835 | 14 | #include <linux/initrd.h> |
e169cfbe GL |
15 | #include <linux/of.h> |
16 | #include <linux/of_fdt.h> | |
17 | ||
51975db0 | 18 | |
86e03221 GL |
19 | #ifdef CONFIG_PPC |
20 | #include <asm/machdep.h> | |
21 | #endif /* CONFIG_PPC */ | |
22 | ||
f00abd94 GL |
23 | int __initdata dt_root_addr_cells; |
24 | int __initdata dt_root_size_cells; | |
25 | ||
e169cfbe GL |
26 | struct boot_param_header *initial_boot_params; |
27 | ||
28 | char *find_flat_dt_string(u32 offset) | |
29 | { | |
30 | return ((char *)initial_boot_params) + | |
087f79c4 | 31 | be32_to_cpu(initial_boot_params->off_dt_strings) + offset; |
e169cfbe | 32 | } |
c8cb7a59 GL |
33 | |
34 | /** | |
35 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
36 | * @it: callback function | |
37 | * @data: context data pointer | |
38 | * | |
39 | * This function is used to scan the flattened device-tree, it is | |
40 | * used to extract the memory information at boot before we can | |
41 | * unflatten the tree | |
42 | */ | |
43 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
44 | const char *uname, int depth, | |
45 | void *data), | |
46 | void *data) | |
47 | { | |
48 | unsigned long p = ((unsigned long)initial_boot_params) + | |
087f79c4 | 49 | be32_to_cpu(initial_boot_params->off_dt_struct); |
c8cb7a59 GL |
50 | int rc = 0; |
51 | int depth = -1; | |
52 | ||
53 | do { | |
33714881 | 54 | u32 tag = be32_to_cpup((__be32 *)p); |
c8cb7a59 GL |
55 | char *pathp; |
56 | ||
57 | p += 4; | |
58 | if (tag == OF_DT_END_NODE) { | |
59 | depth--; | |
60 | continue; | |
61 | } | |
62 | if (tag == OF_DT_NOP) | |
63 | continue; | |
64 | if (tag == OF_DT_END) | |
65 | break; | |
66 | if (tag == OF_DT_PROP) { | |
33714881 | 67 | u32 sz = be32_to_cpup((__be32 *)p); |
c8cb7a59 | 68 | p += 8; |
087f79c4 | 69 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
c8cb7a59 GL |
70 | p = _ALIGN(p, sz >= 8 ? 8 : 4); |
71 | p += sz; | |
72 | p = _ALIGN(p, 4); | |
73 | continue; | |
74 | } | |
75 | if (tag != OF_DT_BEGIN_NODE) { | |
76 | pr_err("Invalid tag %x in flat device tree!\n", tag); | |
77 | return -EINVAL; | |
78 | } | |
79 | depth++; | |
80 | pathp = (char *)p; | |
81 | p = _ALIGN(p + strlen(pathp) + 1, 4); | |
82 | if ((*pathp) == '/') { | |
83 | char *lp, *np; | |
84 | for (lp = NULL, np = pathp; *np; np++) | |
85 | if ((*np) == '/') | |
86 | lp = np+1; | |
87 | if (lp != NULL) | |
88 | pathp = lp; | |
89 | } | |
90 | rc = it(p, pathp, depth, data); | |
91 | if (rc != 0) | |
92 | break; | |
93 | } while (1); | |
94 | ||
95 | return rc; | |
96 | } | |
819d2819 GL |
97 | |
98 | /** | |
99 | * of_get_flat_dt_root - find the root node in the flat blob | |
100 | */ | |
101 | unsigned long __init of_get_flat_dt_root(void) | |
102 | { | |
103 | unsigned long p = ((unsigned long)initial_boot_params) + | |
087f79c4 | 104 | be32_to_cpu(initial_boot_params->off_dt_struct); |
819d2819 | 105 | |
33714881 | 106 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) |
819d2819 | 107 | p += 4; |
33714881 | 108 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); |
819d2819 GL |
109 | p += 4; |
110 | return _ALIGN(p + strlen((char *)p) + 1, 4); | |
111 | } | |
112 | ||
ca900cfa GL |
113 | /** |
114 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
115 | * | |
116 | * This function can be used within scan_flattened_dt callback to get | |
117 | * access to properties | |
118 | */ | |
119 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, | |
120 | unsigned long *size) | |
121 | { | |
122 | unsigned long p = node; | |
123 | ||
124 | do { | |
33714881 | 125 | u32 tag = be32_to_cpup((__be32 *)p); |
ca900cfa GL |
126 | u32 sz, noff; |
127 | const char *nstr; | |
128 | ||
129 | p += 4; | |
130 | if (tag == OF_DT_NOP) | |
131 | continue; | |
132 | if (tag != OF_DT_PROP) | |
133 | return NULL; | |
134 | ||
33714881 JK |
135 | sz = be32_to_cpup((__be32 *)p); |
136 | noff = be32_to_cpup((__be32 *)(p + 4)); | |
ca900cfa | 137 | p += 8; |
087f79c4 | 138 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
ca900cfa GL |
139 | p = _ALIGN(p, sz >= 8 ? 8 : 4); |
140 | ||
141 | nstr = find_flat_dt_string(noff); | |
142 | if (nstr == NULL) { | |
143 | pr_warning("Can't find property index name !\n"); | |
144 | return NULL; | |
145 | } | |
146 | if (strcmp(name, nstr) == 0) { | |
147 | if (size) | |
148 | *size = sz; | |
149 | return (void *)p; | |
150 | } | |
151 | p += sz; | |
152 | p = _ALIGN(p, 4); | |
153 | } while (1); | |
154 | } | |
155 | ||
00e38efd GL |
156 | /** |
157 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
158 | * @node: node to test | |
159 | * @compat: compatible string to compare with compatible list. | |
160 | */ | |
161 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
162 | { | |
163 | const char *cp; | |
164 | unsigned long cplen, l; | |
165 | ||
166 | cp = of_get_flat_dt_prop(node, "compatible", &cplen); | |
167 | if (cp == NULL) | |
168 | return 0; | |
169 | while (cplen > 0) { | |
170 | if (strncasecmp(cp, compat, strlen(compat)) == 0) | |
171 | return 1; | |
172 | l = strlen(cp) + 1; | |
173 | cp += l; | |
174 | cplen -= l; | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
bbd33931 GL |
180 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
181 | unsigned long align) | |
182 | { | |
183 | void *res; | |
184 | ||
185 | *mem = _ALIGN(*mem, align); | |
186 | res = (void *)*mem; | |
187 | *mem += size; | |
188 | ||
189 | return res; | |
190 | } | |
191 | ||
192 | /** | |
193 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
194 | * @p: pointer to node in flat tree | |
195 | * @dad: Parent struct device_node | |
196 | * @allnextpp: pointer to ->allnext from last allocated device_node | |
197 | * @fpsize: Size of the node path up at the current depth. | |
198 | */ | |
199 | unsigned long __init unflatten_dt_node(unsigned long mem, | |
200 | unsigned long *p, | |
201 | struct device_node *dad, | |
202 | struct device_node ***allnextpp, | |
203 | unsigned long fpsize) | |
204 | { | |
205 | struct device_node *np; | |
206 | struct property *pp, **prev_pp = NULL; | |
207 | char *pathp; | |
208 | u32 tag; | |
209 | unsigned int l, allocl; | |
210 | int has_name = 0; | |
211 | int new_format = 0; | |
212 | ||
33714881 | 213 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
214 | if (tag != OF_DT_BEGIN_NODE) { |
215 | pr_err("Weird tag at start of node: %x\n", tag); | |
216 | return mem; | |
217 | } | |
218 | *p += 4; | |
219 | pathp = (char *)*p; | |
220 | l = allocl = strlen(pathp) + 1; | |
221 | *p = _ALIGN(*p + l, 4); | |
222 | ||
223 | /* version 0x10 has a more compact unit name here instead of the full | |
224 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
225 | * it later. We detect this because the first character of the name is | |
226 | * not '/'. | |
227 | */ | |
228 | if ((*pathp) != '/') { | |
229 | new_format = 1; | |
230 | if (fpsize == 0) { | |
231 | /* root node: special case. fpsize accounts for path | |
232 | * plus terminating zero. root node only has '/', so | |
233 | * fpsize should be 2, but we want to avoid the first | |
234 | * level nodes to have two '/' so we use fpsize 1 here | |
235 | */ | |
236 | fpsize = 1; | |
237 | allocl = 2; | |
238 | } else { | |
239 | /* account for '/' and path size minus terminal 0 | |
240 | * already in 'l' | |
241 | */ | |
242 | fpsize += l; | |
243 | allocl = fpsize; | |
244 | } | |
245 | } | |
246 | ||
247 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
248 | __alignof__(struct device_node)); | |
249 | if (allnextpp) { | |
250 | memset(np, 0, sizeof(*np)); | |
251 | np->full_name = ((char *)np) + sizeof(struct device_node); | |
252 | if (new_format) { | |
253 | char *fn = np->full_name; | |
254 | /* rebuild full path for new format */ | |
255 | if (dad && dad->parent) { | |
256 | strcpy(fn, dad->full_name); | |
257 | #ifdef DEBUG | |
258 | if ((strlen(fn) + l + 1) != allocl) { | |
259 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
260 | pathp, (int)strlen(fn), | |
261 | l, allocl); | |
262 | } | |
263 | #endif | |
264 | fn += strlen(fn); | |
265 | } | |
266 | *(fn++) = '/'; | |
267 | memcpy(fn, pathp, l); | |
268 | } else | |
269 | memcpy(np->full_name, pathp, l); | |
270 | prev_pp = &np->properties; | |
271 | **allnextpp = np; | |
272 | *allnextpp = &np->allnext; | |
273 | if (dad != NULL) { | |
274 | np->parent = dad; | |
275 | /* we temporarily use the next field as `last_child'*/ | |
276 | if (dad->next == NULL) | |
277 | dad->child = np; | |
278 | else | |
279 | dad->next->sibling = np; | |
280 | dad->next = np; | |
281 | } | |
282 | kref_init(&np->kref); | |
283 | } | |
284 | while (1) { | |
285 | u32 sz, noff; | |
286 | char *pname; | |
287 | ||
33714881 | 288 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
289 | if (tag == OF_DT_NOP) { |
290 | *p += 4; | |
291 | continue; | |
292 | } | |
293 | if (tag != OF_DT_PROP) | |
294 | break; | |
295 | *p += 4; | |
33714881 JK |
296 | sz = be32_to_cpup((__be32 *)(*p)); |
297 | noff = be32_to_cpup((__be32 *)((*p) + 4)); | |
bbd33931 | 298 | *p += 8; |
087f79c4 | 299 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
bbd33931 GL |
300 | *p = _ALIGN(*p, sz >= 8 ? 8 : 4); |
301 | ||
302 | pname = find_flat_dt_string(noff); | |
303 | if (pname == NULL) { | |
304 | pr_info("Can't find property name in list !\n"); | |
305 | break; | |
306 | } | |
307 | if (strcmp(pname, "name") == 0) | |
308 | has_name = 1; | |
309 | l = strlen(pname) + 1; | |
310 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
311 | __alignof__(struct property)); | |
312 | if (allnextpp) { | |
313 | if (strcmp(pname, "linux,phandle") == 0) { | |
6016a363 GL |
314 | if (np->phandle == 0) |
315 | np->phandle = *((u32 *)*p); | |
bbd33931 GL |
316 | } |
317 | if (strcmp(pname, "ibm,phandle") == 0) | |
6016a363 | 318 | np->phandle = *((u32 *)*p); |
bbd33931 GL |
319 | pp->name = pname; |
320 | pp->length = sz; | |
321 | pp->value = (void *)*p; | |
322 | *prev_pp = pp; | |
323 | prev_pp = &pp->next; | |
324 | } | |
325 | *p = _ALIGN((*p) + sz, 4); | |
326 | } | |
327 | /* with version 0x10 we may not have the name property, recreate | |
328 | * it here from the unit name if absent | |
329 | */ | |
330 | if (!has_name) { | |
331 | char *p1 = pathp, *ps = pathp, *pa = NULL; | |
332 | int sz; | |
333 | ||
334 | while (*p1) { | |
335 | if ((*p1) == '@') | |
336 | pa = p1; | |
337 | if ((*p1) == '/') | |
338 | ps = p1 + 1; | |
339 | p1++; | |
340 | } | |
341 | if (pa < ps) | |
342 | pa = p1; | |
343 | sz = (pa - ps) + 1; | |
344 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
345 | __alignof__(struct property)); | |
346 | if (allnextpp) { | |
347 | pp->name = "name"; | |
348 | pp->length = sz; | |
349 | pp->value = pp + 1; | |
350 | *prev_pp = pp; | |
351 | prev_pp = &pp->next; | |
352 | memcpy(pp->value, ps, sz - 1); | |
353 | ((char *)pp->value)[sz - 1] = 0; | |
354 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
355 | (char *)pp->value); | |
356 | } | |
357 | } | |
358 | if (allnextpp) { | |
359 | *prev_pp = NULL; | |
360 | np->name = of_get_property(np, "name", NULL); | |
361 | np->type = of_get_property(np, "device_type", NULL); | |
362 | ||
363 | if (!np->name) | |
364 | np->name = "<NULL>"; | |
365 | if (!np->type) | |
366 | np->type = "<NULL>"; | |
367 | } | |
368 | while (tag == OF_DT_BEGIN_NODE) { | |
369 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); | |
33714881 | 370 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
371 | } |
372 | if (tag != OF_DT_END_NODE) { | |
373 | pr_err("Weird tag at end of node: %x\n", tag); | |
374 | return mem; | |
375 | } | |
376 | *p += 4; | |
377 | return mem; | |
378 | } | |
41f88009 | 379 | |
f7b3a835 GL |
380 | #ifdef CONFIG_BLK_DEV_INITRD |
381 | /** | |
382 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
383 | * @node: reference to node containing initrd location ('chosen') | |
384 | */ | |
385 | void __init early_init_dt_check_for_initrd(unsigned long node) | |
386 | { | |
1406bc2f | 387 | unsigned long start, end, len; |
33714881 | 388 | __be32 *prop; |
f7b3a835 GL |
389 | |
390 | pr_debug("Looking for initrd properties... "); | |
391 | ||
392 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
393 | if (!prop) |
394 | return; | |
395 | start = of_read_ulong(prop, len/4); | |
396 | ||
397 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
398 | if (!prop) | |
399 | return; | |
400 | end = of_read_ulong(prop, len/4); | |
f7b3a835 | 401 | |
1406bc2f JK |
402 | early_init_dt_setup_initrd_arch(start, end); |
403 | pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end); | |
f7b3a835 GL |
404 | } |
405 | #else | |
406 | inline void early_init_dt_check_for_initrd(unsigned long node) | |
407 | { | |
408 | } | |
409 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
410 | ||
f00abd94 GL |
411 | /** |
412 | * early_init_dt_scan_root - fetch the top level address and size cells | |
413 | */ | |
414 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
415 | int depth, void *data) | |
416 | { | |
33714881 | 417 | __be32 *prop; |
f00abd94 GL |
418 | |
419 | if (depth != 0) | |
420 | return 0; | |
421 | ||
33714881 JK |
422 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
423 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
424 | ||
f00abd94 | 425 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
426 | if (prop) |
427 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
428 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
429 | ||
430 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
431 | if (prop) |
432 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
433 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
434 | ||
435 | /* break now */ | |
436 | return 1; | |
437 | } | |
438 | ||
2e89e685 | 439 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
83f7a06e | 440 | { |
2e89e685 | 441 | __be32 *p = *cellp; |
83f7a06e GL |
442 | |
443 | *cellp = p + s; | |
444 | return of_read_number(p, s); | |
445 | } | |
446 | ||
51975db0 GL |
447 | /** |
448 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
449 | */ | |
450 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
451 | int depth, void *data) | |
452 | { | |
453 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
454 | __be32 *reg, *endp; | |
455 | unsigned long l; | |
456 | ||
457 | /* We are scanning "memory" nodes only */ | |
458 | if (type == NULL) { | |
459 | /* | |
460 | * The longtrail doesn't have a device_type on the | |
461 | * /memory node, so look for the node called /memory@0. | |
462 | */ | |
463 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
464 | return 0; | |
465 | } else if (strcmp(type, "memory") != 0) | |
466 | return 0; | |
467 | ||
468 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
469 | if (reg == NULL) | |
470 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
471 | if (reg == NULL) | |
472 | return 0; | |
473 | ||
474 | endp = reg + (l / sizeof(__be32)); | |
475 | ||
476 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
477 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
478 | ||
479 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
480 | u64 base, size; | |
481 | ||
482 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
483 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
484 | ||
485 | if (size == 0) | |
486 | continue; | |
487 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
488 | (unsigned long long)size); | |
489 | ||
490 | early_init_dt_add_memory_arch(base, size); | |
491 | } | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
86e03221 GL |
496 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
497 | int depth, void *data) | |
498 | { | |
499 | unsigned long l; | |
500 | char *p; | |
501 | ||
502 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
503 | ||
504 | if (depth != 1 || | |
505 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) | |
506 | return 0; | |
507 | ||
508 | early_init_dt_check_for_initrd(node); | |
509 | ||
510 | /* Retreive command line */ | |
511 | p = of_get_flat_dt_prop(node, "bootargs", &l); | |
512 | if (p != NULL && l > 0) | |
513 | strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE)); | |
514 | ||
515 | #ifdef CONFIG_CMDLINE | |
516 | #ifndef CONFIG_CMDLINE_FORCE | |
517 | if (p == NULL || l == 0 || (l == 1 && (*p) == 0)) | |
518 | #endif | |
519 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
520 | #endif /* CONFIG_CMDLINE */ | |
521 | ||
522 | early_init_dt_scan_chosen_arch(node); | |
523 | ||
524 | pr_debug("Command line is: %s\n", cmd_line); | |
525 | ||
526 | /* break now */ | |
527 | return 1; | |
528 | } | |
529 | ||
41f88009 GL |
530 | /** |
531 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
532 | * | |
533 | * unflattens the device-tree passed by the firmware, creating the | |
534 | * tree of struct device_node. It also fills the "name" and "type" | |
535 | * pointers of the nodes so the normal device-tree walking functions | |
536 | * can be used. | |
537 | */ | |
538 | void __init unflatten_device_tree(void) | |
539 | { | |
540 | unsigned long start, mem, size; | |
541 | struct device_node **allnextp = &allnodes; | |
542 | ||
543 | pr_debug(" -> unflatten_device_tree()\n"); | |
544 | ||
545 | /* First pass, scan for size */ | |
546 | start = ((unsigned long)initial_boot_params) + | |
087f79c4 | 547 | be32_to_cpu(initial_boot_params->off_dt_struct); |
41f88009 GL |
548 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); |
549 | size = (size | 3) + 1; | |
550 | ||
551 | pr_debug(" size is %lx, allocating...\n", size); | |
552 | ||
553 | /* Allocate memory for the expanded device tree */ | |
554 | mem = lmb_alloc(size + 4, __alignof__(struct device_node)); | |
555 | mem = (unsigned long) __va(mem); | |
556 | ||
33714881 | 557 | ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef); |
41f88009 GL |
558 | |
559 | pr_debug(" unflattening %lx...\n", mem); | |
560 | ||
561 | /* Second pass, do actual unflattening */ | |
562 | start = ((unsigned long)initial_boot_params) + | |
087f79c4 | 563 | be32_to_cpu(initial_boot_params->off_dt_struct); |
41f88009 | 564 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); |
33714881 | 565 | if (be32_to_cpup((__be32 *)start) != OF_DT_END) |
41f88009 | 566 | pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start)); |
33714881 | 567 | if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef) |
41f88009 | 568 | pr_warning("End of tree marker overwritten: %08x\n", |
33714881 | 569 | be32_to_cpu(((__be32 *)mem)[size / 4])); |
41f88009 GL |
570 | *allnextp = NULL; |
571 | ||
572 | /* Get pointer to OF "/chosen" node for use everywhere */ | |
573 | of_chosen = of_find_node_by_path("/chosen"); | |
574 | if (of_chosen == NULL) | |
575 | of_chosen = of_find_node_by_path("/chosen@0"); | |
576 | ||
577 | pr_debug(" <- unflatten_device_tree()\n"); | |
578 | } |