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12#include <linux/kernel.h>
13#include <linux/initrd.h>
14#include <linux/memblock.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/of_fdt.h>
18#include <linux/of_reserved_mem.h>
19#include <linux/sizes.h>
20#include <linux/string.h>
21#include <linux/errno.h>
22#include <linux/slab.h>
23
24#include <asm/setup.h>
25#ifdef CONFIG_PPC
26#include <asm/machdep.h>
27#endif
28
29#include <asm/page.h>
30
31char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
32{
33 return ((char *)blob) +
34 be32_to_cpu(blob->off_dt_strings) + offset;
35}
36
37
38
39
40
41void *of_fdt_get_property(struct boot_param_header *blob,
42 unsigned long node, const char *name,
43 unsigned long *size)
44{
45 unsigned long p = node;
46
47 do {
48 u32 tag = be32_to_cpup((__be32 *)p);
49 u32 sz, noff;
50 const char *nstr;
51
52 p += 4;
53 if (tag == OF_DT_NOP)
54 continue;
55 if (tag != OF_DT_PROP)
56 return NULL;
57
58 sz = be32_to_cpup((__be32 *)p);
59 noff = be32_to_cpup((__be32 *)(p + 4));
60 p += 8;
61 if (be32_to_cpu(blob->version) < 0x10)
62 p = ALIGN(p, sz >= 8 ? 8 : 4);
63
64 nstr = of_fdt_get_string(blob, noff);
65 if (nstr == NULL) {
66 pr_warning("Can't find property index name !\n");
67 return NULL;
68 }
69 if (strcmp(name, nstr) == 0) {
70 if (size)
71 *size = sz;
72 return (void *)p;
73 }
74 p += sz;
75 p = ALIGN(p, 4);
76 } while (1);
77}
78
79
80
81
82
83
84
85
86
87
88
89int of_fdt_is_compatible(struct boot_param_header *blob,
90 unsigned long node, const char *compat)
91{
92 const char *cp;
93 unsigned long cplen, l, score = 0;
94
95 cp = of_fdt_get_property(blob, node, "compatible", &cplen);
96 if (cp == NULL)
97 return 0;
98 while (cplen > 0) {
99 score++;
100 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
101 return score;
102 l = strlen(cp) + 1;
103 cp += l;
104 cplen -= l;
105 }
106
107 return 0;
108}
109
110
111
112
113int of_fdt_match(struct boot_param_header *blob, unsigned long node,
114 const char *const *compat)
115{
116 unsigned int tmp, score = 0;
117
118 if (!compat)
119 return 0;
120
121 while (*compat) {
122 tmp = of_fdt_is_compatible(blob, node, *compat);
123 if (tmp && (score == 0 || (tmp < score)))
124 score = tmp;
125 compat++;
126 }
127
128 return score;
129}
130
131static void *unflatten_dt_alloc(void **mem, unsigned long size,
132 unsigned long align)
133{
134 void *res;
135
136 *mem = PTR_ALIGN(*mem, align);
137 res = *mem;
138 *mem += size;
139
140 return res;
141}
142
143
144
145
146
147
148
149
150
151
152static void * unflatten_dt_node(struct boot_param_header *blob,
153 void *mem,
154 void **p,
155 struct device_node *dad,
156 struct device_node ***allnextpp,
157 unsigned long fpsize)
158{
159 struct device_node *np;
160 struct property *pp, **prev_pp = NULL;
161 char *pathp;
162 u32 tag;
163 unsigned int l, allocl;
164 int has_name = 0;
165 int new_format = 0;
166
167 tag = be32_to_cpup(*p);
168 if (tag != OF_DT_BEGIN_NODE) {
169 pr_err("Weird tag at start of node: %x\n", tag);
170 return mem;
171 }
172 *p += 4;
173 pathp = *p;
174 l = allocl = strlen(pathp) + 1;
175 *p = PTR_ALIGN(*p + l, 4);
176
177
178
179
180
181
182 if ((*pathp) != '/') {
183 new_format = 1;
184 if (fpsize == 0) {
185
186
187
188
189
190 fpsize = 1;
191 allocl = 2;
192 l = 1;
193 *pathp = '\0';
194 } else {
195
196
197
198 fpsize += l;
199 allocl = fpsize;
200 }
201 }
202
203 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
204 __alignof__(struct device_node));
205 if (allnextpp) {
206 char *fn;
207 of_node_init(np);
208 np->full_name = fn = ((char *)np) + sizeof(*np);
209 if (new_format) {
210
211 if (dad && dad->parent) {
212 strcpy(fn, dad->full_name);
213#ifdef DEBUG
214 if ((strlen(fn) + l + 1) != allocl) {
215 pr_debug("%s: p: %d, l: %d, a: %d\n",
216 pathp, (int)strlen(fn),
217 l, allocl);
218 }
219#endif
220 fn += strlen(fn);
221 }
222 *(fn++) = '/';
223 }
224 memcpy(fn, pathp, l);
225
226 prev_pp = &np->properties;
227 **allnextpp = np;
228 *allnextpp = &np->allnext;
229 if (dad != NULL) {
230 np->parent = dad;
231
232 if (dad->next == NULL)
233 dad->child = np;
234 else
235 dad->next->sibling = np;
236 dad->next = np;
237 }
238 }
239
240 while (1) {
241 u32 sz, noff;
242 char *pname;
243
244 tag = be32_to_cpup(*p);
245 if (tag == OF_DT_NOP) {
246 *p += 4;
247 continue;
248 }
249 if (tag != OF_DT_PROP)
250 break;
251 *p += 4;
252 sz = be32_to_cpup(*p);
253 noff = be32_to_cpup(*p + 4);
254 *p += 8;
255 if (be32_to_cpu(blob->version) < 0x10)
256 *p = PTR_ALIGN(*p, sz >= 8 ? 8 : 4);
257
258 pname = of_fdt_get_string(blob, noff);
259 if (pname == NULL) {
260 pr_info("Can't find property name in list !\n");
261 break;
262 }
263 if (strcmp(pname, "name") == 0)
264 has_name = 1;
265 l = strlen(pname) + 1;
266 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
267 __alignof__(struct property));
268 if (allnextpp) {
269
270
271
272
273
274 if ((strcmp(pname, "phandle") == 0) ||
275 (strcmp(pname, "linux,phandle") == 0)) {
276 if (np->phandle == 0)
277 np->phandle = be32_to_cpup((__be32*)*p);
278 }
279
280
281
282 if (strcmp(pname, "ibm,phandle") == 0)
283 np->phandle = be32_to_cpup((__be32 *)*p);
284 pp->name = pname;
285 pp->length = sz;
286 pp->value = *p;
287 *prev_pp = pp;
288 prev_pp = &pp->next;
289 }
290 *p = PTR_ALIGN((*p) + sz, 4);
291 }
292
293
294
295 if (!has_name) {
296 char *p1 = pathp, *ps = pathp, *pa = NULL;
297 int sz;
298
299 while (*p1) {
300 if ((*p1) == '@')
301 pa = p1;
302 if ((*p1) == '/')
303 ps = p1 + 1;
304 p1++;
305 }
306 if (pa < ps)
307 pa = p1;
308 sz = (pa - ps) + 1;
309 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
310 __alignof__(struct property));
311 if (allnextpp) {
312 pp->name = "name";
313 pp->length = sz;
314 pp->value = pp + 1;
315 *prev_pp = pp;
316 prev_pp = &pp->next;
317 memcpy(pp->value, ps, sz - 1);
318 ((char *)pp->value)[sz - 1] = 0;
319 pr_debug("fixed up name for %s -> %s\n", pathp,
320 (char *)pp->value);
321 }
322 }
323 if (allnextpp) {
324 *prev_pp = NULL;
325 np->name = of_get_property(np, "name", NULL);
326 np->type = of_get_property(np, "device_type", NULL);
327
328 if (!np->name)
329 np->name = "<NULL>";
330 if (!np->type)
331 np->type = "<NULL>";
332 }
333 while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
334 if (tag == OF_DT_NOP)
335 *p += 4;
336 else
337 mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
338 fpsize);
339 tag = be32_to_cpup(*p);
340 }
341 if (tag != OF_DT_END_NODE) {
342 pr_err("Weird tag at end of node: %x\n", tag);
343 return mem;
344 }
345 *p += 4;
346 return mem;
347}
348
349
350
351
352
353
354
355
356
357
358
359
360
361static void __unflatten_device_tree(struct boot_param_header *blob,
362 struct device_node **mynodes,
363 void * (*dt_alloc)(u64 size, u64 align))
364{
365 unsigned long size;
366 void *start, *mem;
367 struct device_node **allnextp = mynodes;
368
369 pr_debug(" -> unflatten_device_tree()\n");
370
371 if (!blob) {
372 pr_debug("No device tree pointer\n");
373 return;
374 }
375
376 pr_debug("Unflattening device tree:\n");
377 pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
378 pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
379 pr_debug("version: %08x\n", be32_to_cpu(blob->version));
380
381 if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
382 pr_err("Invalid device tree blob header\n");
383 return;
384 }
385
386
387 start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct);
388 size = (unsigned long)unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
389 size = ALIGN(size, 4);
390
391 pr_debug(" size is %lx, allocating...\n", size);
392
393
394 mem = dt_alloc(size + 4, __alignof__(struct device_node));
395 memset(mem, 0, size);
396
397 *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
398
399 pr_debug(" unflattening %p...\n", mem);
400
401
402 start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct);
403 unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
404 if (be32_to_cpup(start) != OF_DT_END)
405 pr_warning("Weird tag at end of tree: %08x\n", be32_to_cpup(start));
406 if (be32_to_cpup(mem + size) != 0xdeadbeef)
407 pr_warning("End of tree marker overwritten: %08x\n",
408 be32_to_cpup(mem + size));
409 *allnextp = NULL;
410
411 pr_debug(" <- unflatten_device_tree()\n");
412}
413
414static void *kernel_tree_alloc(u64 size, u64 align)
415{
416 return kzalloc(size, GFP_KERNEL);
417}
418
419
420
421
422
423
424
425
426
427void of_fdt_unflatten_tree(unsigned long *blob,
428 struct device_node **mynodes)
429{
430 struct boot_param_header *device_tree =
431 (struct boot_param_header *)blob;
432 __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
433}
434EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
435
436
437int __initdata dt_root_addr_cells;
438int __initdata dt_root_size_cells;
439
440struct boot_param_header *initial_boot_params;
441
442#ifdef CONFIG_OF_EARLY_FLATTREE
443
444
445
446
447static int __init __reserved_mem_reserve_reg(unsigned long node,
448 const char *uname)
449{
450 int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
451 phys_addr_t base, size;
452 unsigned long len;
453 __be32 *prop;
454 int nomap, first = 1;
455
456 prop = of_get_flat_dt_prop(node, "reg", &len);
457 if (!prop)
458 return -ENOENT;
459
460 if (len && len % t_len != 0) {
461 pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
462 uname);
463 return -EINVAL;
464 }
465
466 nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
467
468 while (len >= t_len) {
469 base = dt_mem_next_cell(dt_root_addr_cells, &prop);
470 size = dt_mem_next_cell(dt_root_size_cells, &prop);
471
472 if (base && size &&
473 early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
474 pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
475 uname, &base, (unsigned long)size / SZ_1M);
476 else
477 pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
478 uname, &base, (unsigned long)size / SZ_1M);
479
480 len -= t_len;
481 if (first) {
482 fdt_reserved_mem_save_node(node, uname, base, size);
483 first = 0;
484 }
485 }
486 return 0;
487}
488
489
490
491
492
493
494static int __init __reserved_mem_check_root(unsigned long node)
495{
496 __be32 *prop;
497
498 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
499 if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
500 return -EINVAL;
501
502 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
503 if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
504 return -EINVAL;
505
506 prop = of_get_flat_dt_prop(node, "ranges", NULL);
507 if (!prop)
508 return -EINVAL;
509 return 0;
510}
511
512
513
514
515static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
516 int depth, void *data)
517{
518 static int found;
519 const char *status;
520 int err;
521
522 if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
523 if (__reserved_mem_check_root(node) != 0) {
524 pr_err("Reserved memory: unsupported node format, ignoring\n");
525
526 return 1;
527 }
528 found = 1;
529
530 return 0;
531 } else if (!found) {
532
533 return 0;
534 } else if (found && depth < 2) {
535
536 return 1;
537 }
538
539 status = of_get_flat_dt_prop(node, "status", NULL);
540 if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
541 return 0;
542
543 err = __reserved_mem_reserve_reg(node, uname);
544 if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
545 fdt_reserved_mem_save_node(node, uname, 0, 0);
546
547
548 return 0;
549}
550
551
552
553
554
555
556
557
558void __init early_init_fdt_scan_reserved_mem(void)
559{
560 if (!initial_boot_params)
561 return;
562
563 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
564 fdt_init_reserved_mem();
565}
566
567
568
569
570
571
572
573
574
575
576int __init of_scan_flat_dt(int (*it)(unsigned long node,
577 const char *uname, int depth,
578 void *data),
579 void *data)
580{
581 unsigned long p = ((unsigned long)initial_boot_params) +
582 be32_to_cpu(initial_boot_params->off_dt_struct);
583 int rc = 0;
584 int depth = -1;
585
586 do {
587 u32 tag = be32_to_cpup((__be32 *)p);
588 const char *pathp;
589
590 p += 4;
591 if (tag == OF_DT_END_NODE) {
592 depth--;
593 continue;
594 }
595 if (tag == OF_DT_NOP)
596 continue;
597 if (tag == OF_DT_END)
598 break;
599 if (tag == OF_DT_PROP) {
600 u32 sz = be32_to_cpup((__be32 *)p);
601 p += 8;
602 if (be32_to_cpu(initial_boot_params->version) < 0x10)
603 p = ALIGN(p, sz >= 8 ? 8 : 4);
604 p += sz;
605 p = ALIGN(p, 4);
606 continue;
607 }
608 if (tag != OF_DT_BEGIN_NODE) {
609 pr_err("Invalid tag %x in flat device tree!\n", tag);
610 return -EINVAL;
611 }
612 depth++;
613 pathp = (char *)p;
614 p = ALIGN(p + strlen(pathp) + 1, 4);
615 if (*pathp == '/')
616 pathp = kbasename(pathp);
617 rc = it(p, pathp, depth, data);
618 if (rc != 0)
619 break;
620 } while (1);
621
622 return rc;
623}
624
625
626
627
628unsigned long __init of_get_flat_dt_root(void)
629{
630 unsigned long p = ((unsigned long)initial_boot_params) +
631 be32_to_cpu(initial_boot_params->off_dt_struct);
632
633 while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
634 p += 4;
635 BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
636 p += 4;
637 return ALIGN(p + strlen((char *)p) + 1, 4);
638}
639
640
641
642
643
644
645
646void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
647 unsigned long *size)
648{
649 return of_fdt_get_property(initial_boot_params, node, name, size);
650}
651
652
653
654
655
656
657int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
658{
659 return of_fdt_is_compatible(initial_boot_params, node, compat);
660}
661
662
663
664
665int __init of_flat_dt_match(unsigned long node, const char *const *compat)
666{
667 return of_fdt_match(initial_boot_params, node, compat);
668}
669
670struct fdt_scan_status {
671 const char *name;
672 int namelen;
673 int depth;
674 int found;
675 int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
676 void *data;
677};
678
679
680
681
682static int __init fdt_scan_node_by_path(unsigned long node, const char *uname,
683 int depth, void *data)
684{
685 struct fdt_scan_status *st = data;
686
687
688
689
690
691 if (depth <= st->depth)
692 return -ENXIO;
693
694
695 if (st->found)
696 return st->iterator(node, uname, depth, st->data);
697
698
699 if (depth == st->depth + 1 &&
700 strncmp(st->name, uname, st->namelen) == 0 &&
701 uname[st->namelen] == 0) {
702 st->depth += 1;
703 if (st->name[st->namelen] == 0) {
704 st->found = 1;
705 } else {
706 const char *next = st->name + st->namelen + 1;
707 st->name = next;
708 st->namelen = strcspn(next, "/");
709 }
710 return 0;
711 }
712
713
714 return 0;
715}
716
717
718
719
720
721
722
723
724
725
726
727
728int __init of_scan_flat_dt_by_path(const char *path,
729 int (*it)(unsigned long node, const char *name, int depth, void *data),
730 void *data)
731{
732 struct fdt_scan_status st = {path, 0, -1, 0, it, data};
733 int ret = 0;
734
735 if (initial_boot_params)
736 ret = of_scan_flat_dt(fdt_scan_node_by_path, &st);
737
738 if (!st.found)
739 return -ENOENT;
740 else if (ret == -ENXIO)
741 return 0;
742 else
743 return ret;
744}
745
746const char * __init of_flat_dt_get_machine_name(void)
747{
748 const char *name;
749 unsigned long dt_root = of_get_flat_dt_root();
750
751 name = of_get_flat_dt_prop(dt_root, "model", NULL);
752 if (!name)
753 name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
754 return name;
755}
756
757
758
759
760
761
762
763
764
765
766const void * __init of_flat_dt_match_machine(const void *default_match,
767 const void * (*get_next_compat)(const char * const**))
768{
769 const void *data = NULL;
770 const void *best_data = default_match;
771 const char *const *compat;
772 unsigned long dt_root;
773 unsigned int best_score = ~1, score = 0;
774
775 dt_root = of_get_flat_dt_root();
776 while ((data = get_next_compat(&compat))) {
777 score = of_flat_dt_match(dt_root, compat);
778 if (score > 0 && score < best_score) {
779 best_data = data;
780 best_score = score;
781 }
782 }
783 if (!best_data) {
784 const char *prop;
785 long size;
786
787 pr_err("\n unrecognized device tree list:\n[ ");
788
789 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
790 if (prop) {
791 while (size > 0) {
792 printk("'%s' ", prop);
793 size -= strlen(prop) + 1;
794 prop += strlen(prop) + 1;
795 }
796 }
797 printk("]\n\n");
798 return NULL;
799 }
800
801 pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
802
803 return best_data;
804}
805
806#ifdef CONFIG_BLK_DEV_INITRD
807
808
809
810
811static void __init early_init_dt_check_for_initrd(unsigned long node)
812{
813 u64 start, end;
814 unsigned long len;
815 __be32 *prop;
816
817 pr_debug("Looking for initrd properties... ");
818
819 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
820 if (!prop)
821 return;
822 start = of_read_number(prop, len/4);
823
824 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
825 if (!prop)
826 return;
827 end = of_read_number(prop, len/4);
828
829 initrd_start = (unsigned long)__va(start);
830 initrd_end = (unsigned long)__va(end);
831 initrd_below_start_ok = 1;
832
833 pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
834 (unsigned long long)start, (unsigned long long)end);
835}
836#else
837static inline void early_init_dt_check_for_initrd(unsigned long node)
838{
839}
840#endif
841
842
843
844
845int __init early_init_dt_scan_root(unsigned long node, const char *uname,
846 int depth, void *data)
847{
848 __be32 *prop;
849
850 if (depth != 0)
851 return 0;
852
853 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
854 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
855
856 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
857 if (prop)
858 dt_root_size_cells = be32_to_cpup(prop);
859 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
860
861 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
862 if (prop)
863 dt_root_addr_cells = be32_to_cpup(prop);
864 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
865
866
867 return 1;
868}
869
870u64 __init dt_mem_next_cell(int s, __be32 **cellp)
871{
872 __be32 *p = *cellp;
873
874 *cellp = p + s;
875 return of_read_number(p, s);
876}
877
878
879
880
881int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
882 int depth, void *data)
883{
884 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
885 __be32 *reg, *endp;
886 unsigned long l;
887
888
889 if (type == NULL) {
890
891
892
893
894 if (depth != 1 || strcmp(uname, "memory@0") != 0)
895 return 0;
896 } else if (strcmp(type, "memory") != 0)
897 return 0;
898
899 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
900 if (reg == NULL)
901 reg = of_get_flat_dt_prop(node, "reg", &l);
902 if (reg == NULL)
903 return 0;
904
905 endp = reg + (l / sizeof(__be32));
906
907 pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
908 uname, l, reg[0], reg[1], reg[2], reg[3]);
909
910 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
911 u64 base, size;
912
913 base = dt_mem_next_cell(dt_root_addr_cells, ®);
914 size = dt_mem_next_cell(dt_root_size_cells, ®);
915
916 if (size == 0)
917 continue;
918 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
919 (unsigned long long)size);
920
921 early_init_dt_add_memory_arch(base, size);
922 }
923
924 return 0;
925}
926
927int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
928 int depth, void *data)
929{
930 unsigned long l;
931 char *p;
932
933 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
934
935 if (depth != 1 || !data ||
936 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
937 return 0;
938
939 early_init_dt_check_for_initrd(node);
940
941
942 p = of_get_flat_dt_prop(node, "bootargs", &l);
943 if (p != NULL && l > 0)
944 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
945
946
947
948
949
950
951#ifdef CONFIG_CMDLINE
952#ifndef CONFIG_CMDLINE_FORCE
953 if (!((char *)data)[0])
954#endif
955 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
956#endif
957
958 pr_debug("Command line is: %s\n", (char*)data);
959
960
961 return 1;
962}
963
964#ifdef CONFIG_HAVE_MEMBLOCK
965void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
966{
967 const u64 phys_offset = __pa(PAGE_OFFSET);
968 base &= PAGE_MASK;
969 size &= PAGE_MASK;
970 if (base + size < phys_offset) {
971 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
972 base, base + size);
973 return;
974 }
975 if (base < phys_offset) {
976 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
977 base, phys_offset);
978 size -= phys_offset - base;
979 base = phys_offset;
980 }
981 memblock_add(base, size);
982}
983
984int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
985 phys_addr_t size, bool nomap)
986{
987 if (memblock_is_region_reserved(base, size))
988 return -EBUSY;
989 if (nomap)
990 return memblock_remove(base, size);
991 return memblock_reserve(base, size);
992}
993
994
995
996
997
998void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
999{
1000 return __va(memblock_alloc(size, align));
1001}
1002#else
1003int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
1004 phys_addr_t size, bool nomap)
1005{
1006 pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n",
1007 base, size, nomap ? " (nomap)" : "");
1008 return -ENOSYS;
1009}
1010#endif
1011
1012bool __init early_init_dt_scan(void *params)
1013{
1014 if (!params)
1015 return false;
1016
1017
1018 initial_boot_params = params;
1019
1020
1021 if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) {
1022 initial_boot_params = NULL;
1023 return false;
1024 }
1025
1026
1027 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
1028
1029
1030 of_scan_flat_dt(early_init_dt_scan_root, NULL);
1031
1032
1033 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1034
1035 return true;
1036}
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046void __init unflatten_device_tree(void)
1047{
1048 __unflatten_device_tree(initial_boot_params, &of_allnodes,
1049 early_init_dt_alloc_memory_arch);
1050
1051
1052 of_alias_scan(early_init_dt_alloc_memory_arch);
1053}
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066void __init unflatten_and_copy_device_tree(void)
1067{
1068 int size;
1069 void *dt;
1070
1071 if (!initial_boot_params) {
1072 pr_warn("No valid device tree found, continuing without\n");
1073 return;
1074 }
1075
1076 size = __be32_to_cpu(initial_boot_params->totalsize);
1077 dt = early_init_dt_alloc_memory_arch(size,
1078 __alignof__(struct boot_param_header));
1079
1080 if (dt) {
1081 memcpy(dt, initial_boot_params, size);
1082 initial_boot_params = dt;
1083 }
1084 unflatten_device_tree();
1085}
1086
1087#endif
1088