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7
8
9#define pr_fmt(fmt) "OF: fdt: " fmt
10
11#include <linux/crc32.h>
12#include <linux/kernel.h>
13#include <linux/initrd.h>
14#include <linux/memblock.h>
15#include <linux/mutex.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#include <linux/libfdt.h>
24#include <linux/debugfs.h>
25#include <linux/serial_core.h>
26#include <linux/sysfs.h>
27
28#include <asm/setup.h>
29#include <asm/page.h>
30
31#include "of_private.h"
32
33
34
35
36
37
38
39
40
41void __init of_fdt_limit_memory(int limit)
42{
43 int memory;
44 int len;
45 const void *val;
46 int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
47 int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
48 const __be32 *addr_prop;
49 const __be32 *size_prop;
50 int root_offset;
51 int cell_size;
52
53 root_offset = fdt_path_offset(initial_boot_params, "/");
54 if (root_offset < 0)
55 return;
56
57 addr_prop = fdt_getprop(initial_boot_params, root_offset,
58 "#address-cells", NULL);
59 if (addr_prop)
60 nr_address_cells = fdt32_to_cpu(*addr_prop);
61
62 size_prop = fdt_getprop(initial_boot_params, root_offset,
63 "#size-cells", NULL);
64 if (size_prop)
65 nr_size_cells = fdt32_to_cpu(*size_prop);
66
67 cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells);
68
69 memory = fdt_path_offset(initial_boot_params, "/memory");
70 if (memory > 0) {
71 val = fdt_getprop(initial_boot_params, memory, "reg", &len);
72 if (len > limit*cell_size) {
73 len = limit*cell_size;
74 pr_debug("Limiting number of entries to %d\n", limit);
75 fdt_setprop(initial_boot_params, memory, "reg", val,
76 len);
77 }
78 }
79}
80
81static bool of_fdt_device_is_available(const void *blob, unsigned long node)
82{
83 const char *status = fdt_getprop(blob, node, "status", NULL);
84
85 if (!status)
86 return true;
87
88 if (!strcmp(status, "ok") || !strcmp(status, "okay"))
89 return true;
90
91 return false;
92}
93
94static void *unflatten_dt_alloc(void **mem, unsigned long size,
95 unsigned long align)
96{
97 void *res;
98
99 *mem = PTR_ALIGN(*mem, align);
100 res = *mem;
101 *mem += size;
102
103 return res;
104}
105
106static void populate_properties(const void *blob,
107 int offset,
108 void **mem,
109 struct device_node *np,
110 const char *nodename,
111 bool dryrun)
112{
113 struct property *pp, **pprev = NULL;
114 int cur;
115 bool has_name = false;
116
117 pprev = &np->properties;
118 for (cur = fdt_first_property_offset(blob, offset);
119 cur >= 0;
120 cur = fdt_next_property_offset(blob, cur)) {
121 const __be32 *val;
122 const char *pname;
123 u32 sz;
124
125 val = fdt_getprop_by_offset(blob, cur, &pname, &sz);
126 if (!val) {
127 pr_warn("Cannot locate property at 0x%x\n", cur);
128 continue;
129 }
130
131 if (!pname) {
132 pr_warn("Cannot find property name at 0x%x\n", cur);
133 continue;
134 }
135
136 if (!strcmp(pname, "name"))
137 has_name = true;
138
139 pp = unflatten_dt_alloc(mem, sizeof(struct property),
140 __alignof__(struct property));
141 if (dryrun)
142 continue;
143
144
145
146
147
148
149
150 if (!strcmp(pname, "phandle") ||
151 !strcmp(pname, "linux,phandle")) {
152 if (!np->phandle)
153 np->phandle = be32_to_cpup(val);
154 }
155
156
157
158
159
160 if (!strcmp(pname, "ibm,phandle"))
161 np->phandle = be32_to_cpup(val);
162
163 pp->name = (char *)pname;
164 pp->length = sz;
165 pp->value = (__be32 *)val;
166 *pprev = pp;
167 pprev = &pp->next;
168 }
169
170
171
172
173 if (!has_name) {
174 const char *p = nodename, *ps = p, *pa = NULL;
175 int len;
176
177 while (*p) {
178 if ((*p) == '@')
179 pa = p;
180 else if ((*p) == '/')
181 ps = p + 1;
182 p++;
183 }
184
185 if (pa < ps)
186 pa = p;
187 len = (pa - ps) + 1;
188 pp = unflatten_dt_alloc(mem, sizeof(struct property) + len,
189 __alignof__(struct property));
190 if (!dryrun) {
191 pp->name = "name";
192 pp->length = len;
193 pp->value = pp + 1;
194 *pprev = pp;
195 pprev = &pp->next;
196 memcpy(pp->value, ps, len - 1);
197 ((char *)pp->value)[len - 1] = 0;
198 pr_debug("fixed up name for %s -> %s\n",
199 nodename, (char *)pp->value);
200 }
201 }
202
203 if (!dryrun)
204 *pprev = NULL;
205}
206
207static bool populate_node(const void *blob,
208 int offset,
209 void **mem,
210 struct device_node *dad,
211 struct device_node **pnp,
212 bool dryrun)
213{
214 struct device_node *np;
215 const char *pathp;
216 unsigned int l, allocl;
217
218 pathp = fdt_get_name(blob, offset, &l);
219 if (!pathp) {
220 *pnp = NULL;
221 return false;
222 }
223
224 allocl = ++l;
225
226 np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl,
227 __alignof__(struct device_node));
228 if (!dryrun) {
229 char *fn;
230 of_node_init(np);
231 np->full_name = fn = ((char *)np) + sizeof(*np);
232
233 memcpy(fn, pathp, l);
234
235 if (dad != NULL) {
236 np->parent = dad;
237 np->sibling = dad->child;
238 dad->child = np;
239 }
240 }
241
242 populate_properties(blob, offset, mem, np, pathp, dryrun);
243 if (!dryrun) {
244 np->name = of_get_property(np, "name", NULL);
245 if (!np->name)
246 np->name = "<NULL>";
247 }
248
249 *pnp = np;
250 return true;
251}
252
253static void reverse_nodes(struct device_node *parent)
254{
255 struct device_node *child, *next;
256
257
258 child = parent->child;
259 while (child) {
260 reverse_nodes(child);
261
262 child = child->sibling;
263 }
264
265
266 child = parent->child;
267 parent->child = NULL;
268 while (child) {
269 next = child->sibling;
270
271 child->sibling = parent->child;
272 parent->child = child;
273 child = next;
274 }
275}
276
277
278
279
280
281
282
283
284
285
286static int unflatten_dt_nodes(const void *blob,
287 void *mem,
288 struct device_node *dad,
289 struct device_node **nodepp)
290{
291 struct device_node *root;
292 int offset = 0, depth = 0, initial_depth = 0;
293#define FDT_MAX_DEPTH 64
294 struct device_node *nps[FDT_MAX_DEPTH];
295 void *base = mem;
296 bool dryrun = !base;
297
298 if (nodepp)
299 *nodepp = NULL;
300
301
302
303
304
305
306
307
308 if (dad)
309 depth = initial_depth = 1;
310
311 root = dad;
312 nps[depth] = dad;
313
314 for (offset = 0;
315 offset >= 0 && depth >= initial_depth;
316 offset = fdt_next_node(blob, offset, &depth)) {
317 if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH))
318 continue;
319
320 if (!IS_ENABLED(CONFIG_OF_KOBJ) &&
321 !of_fdt_device_is_available(blob, offset))
322 continue;
323
324 if (!populate_node(blob, offset, &mem, nps[depth],
325 &nps[depth+1], dryrun))
326 return mem - base;
327
328 if (!dryrun && nodepp && !*nodepp)
329 *nodepp = nps[depth+1];
330 if (!dryrun && !root)
331 root = nps[depth+1];
332 }
333
334 if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
335 pr_err("Error %d processing FDT\n", offset);
336 return -EINVAL;
337 }
338
339
340
341
342
343 if (!dryrun)
344 reverse_nodes(root);
345
346 return mem - base;
347}
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366void *__unflatten_device_tree(const void *blob,
367 struct device_node *dad,
368 struct device_node **mynodes,
369 void *(*dt_alloc)(u64 size, u64 align),
370 bool detached)
371{
372 int size;
373 void *mem;
374
375 pr_debug(" -> unflatten_device_tree()\n");
376
377 if (!blob) {
378 pr_debug("No device tree pointer\n");
379 return NULL;
380 }
381
382 pr_debug("Unflattening device tree:\n");
383 pr_debug("magic: %08x\n", fdt_magic(blob));
384 pr_debug("size: %08x\n", fdt_totalsize(blob));
385 pr_debug("version: %08x\n", fdt_version(blob));
386
387 if (fdt_check_header(blob)) {
388 pr_err("Invalid device tree blob header\n");
389 return NULL;
390 }
391
392
393 size = unflatten_dt_nodes(blob, NULL, dad, NULL);
394 if (size < 0)
395 return NULL;
396
397 size = ALIGN(size, 4);
398 pr_debug(" size is %d, allocating...\n", size);
399
400
401 mem = dt_alloc(size + 4, __alignof__(struct device_node));
402 if (!mem)
403 return NULL;
404
405 memset(mem, 0, size);
406
407 *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
408
409 pr_debug(" unflattening %p...\n", mem);
410
411
412 unflatten_dt_nodes(blob, mem, dad, mynodes);
413 if (be32_to_cpup(mem + size) != 0xdeadbeef)
414 pr_warning("End of tree marker overwritten: %08x\n",
415 be32_to_cpup(mem + size));
416
417 if (detached && mynodes) {
418 of_node_set_flag(*mynodes, OF_DETACHED);
419 pr_debug("unflattened tree is detached\n");
420 }
421
422 pr_debug(" <- unflatten_device_tree()\n");
423 return mem;
424}
425
426static void *kernel_tree_alloc(u64 size, u64 align)
427{
428 return kzalloc(size, GFP_KERNEL);
429}
430
431static DEFINE_MUTEX(of_fdt_unflatten_mutex);
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447void *of_fdt_unflatten_tree(const unsigned long *blob,
448 struct device_node *dad,
449 struct device_node **mynodes)
450{
451 void *mem;
452
453 mutex_lock(&of_fdt_unflatten_mutex);
454 mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc,
455 true);
456 mutex_unlock(&of_fdt_unflatten_mutex);
457
458 return mem;
459}
460EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
461
462
463int __initdata dt_root_addr_cells;
464int __initdata dt_root_size_cells;
465
466void *initial_boot_params __ro_after_init;
467
468#ifdef CONFIG_OF_EARLY_FLATTREE
469
470static u32 of_fdt_crc32;
471
472
473
474
475static int __init __reserved_mem_reserve_reg(unsigned long node,
476 const char *uname)
477{
478 int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
479 phys_addr_t base, size;
480 int len;
481 const __be32 *prop;
482 int first = 1;
483 bool nomap;
484
485 prop = of_get_flat_dt_prop(node, "reg", &len);
486 if (!prop)
487 return -ENOENT;
488
489 if (len && len % t_len != 0) {
490 pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
491 uname);
492 return -EINVAL;
493 }
494
495 nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
496
497 while (len >= t_len) {
498 base = dt_mem_next_cell(dt_root_addr_cells, &prop);
499 size = dt_mem_next_cell(dt_root_size_cells, &prop);
500
501 if (size &&
502 early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
503 pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
504 uname, &base, (unsigned long)size / SZ_1M);
505 else
506 pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
507 uname, &base, (unsigned long)size / SZ_1M);
508
509 len -= t_len;
510 if (first) {
511 fdt_reserved_mem_save_node(node, uname, base, size);
512 first = 0;
513 }
514 }
515 return 0;
516}
517
518
519
520
521
522
523static int __init __reserved_mem_check_root(unsigned long node)
524{
525 const __be32 *prop;
526
527 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
528 if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
529 return -EINVAL;
530
531 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
532 if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
533 return -EINVAL;
534
535 prop = of_get_flat_dt_prop(node, "ranges", NULL);
536 if (!prop)
537 return -EINVAL;
538 return 0;
539}
540
541
542
543
544static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
545 int depth, void *data)
546{
547 static int found;
548 int err;
549
550 if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
551 if (__reserved_mem_check_root(node) != 0) {
552 pr_err("Reserved memory: unsupported node format, ignoring\n");
553
554 return 1;
555 }
556 found = 1;
557
558 return 0;
559 } else if (!found) {
560
561 return 0;
562 } else if (found && depth < 2) {
563
564 return 1;
565 }
566
567 if (!of_fdt_device_is_available(initial_boot_params, node))
568 return 0;
569
570 err = __reserved_mem_reserve_reg(node, uname);
571 if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
572 fdt_reserved_mem_save_node(node, uname, 0, 0);
573
574
575 return 0;
576}
577
578
579
580
581
582
583
584
585void __init early_init_fdt_scan_reserved_mem(void)
586{
587 int n;
588 u64 base, size;
589
590 if (!initial_boot_params)
591 return;
592
593
594 for (n = 0; ; n++) {
595 fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
596 if (!size)
597 break;
598 early_init_dt_reserve_memory_arch(base, size, false);
599 }
600
601 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
602 fdt_init_reserved_mem();
603}
604
605
606
607
608void __init early_init_fdt_reserve_self(void)
609{
610 if (!initial_boot_params)
611 return;
612
613
614 early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
615 fdt_totalsize(initial_boot_params),
616 false);
617}
618
619
620
621
622
623
624
625
626
627
628int __init of_scan_flat_dt(int (*it)(unsigned long node,
629 const char *uname, int depth,
630 void *data),
631 void *data)
632{
633 const void *blob = initial_boot_params;
634 const char *pathp;
635 int offset, rc = 0, depth = -1;
636
637 if (!blob)
638 return 0;
639
640 for (offset = fdt_next_node(blob, -1, &depth);
641 offset >= 0 && depth >= 0 && !rc;
642 offset = fdt_next_node(blob, offset, &depth)) {
643
644 pathp = fdt_get_name(blob, offset, NULL);
645 if (*pathp == '/')
646 pathp = kbasename(pathp);
647 rc = it(offset, pathp, depth, data);
648 }
649 return rc;
650}
651
652
653
654
655
656
657
658
659int __init of_scan_flat_dt_subnodes(unsigned long parent,
660 int (*it)(unsigned long node,
661 const char *uname,
662 void *data),
663 void *data)
664{
665 const void *blob = initial_boot_params;
666 int node;
667
668 fdt_for_each_subnode(node, blob, parent) {
669 const char *pathp;
670 int rc;
671
672 pathp = fdt_get_name(blob, node, NULL);
673 if (*pathp == '/')
674 pathp = kbasename(pathp);
675 rc = it(node, pathp, data);
676 if (rc)
677 return rc;
678 }
679 return 0;
680}
681
682
683
684
685
686
687
688
689
690int __init of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
691{
692 return fdt_subnode_offset(initial_boot_params, node, uname);
693}
694
695
696
697
698unsigned long __init of_get_flat_dt_root(void)
699{
700 return 0;
701}
702
703
704
705
706
707
708
709const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
710 int *size)
711{
712 return fdt_getprop(initial_boot_params, node, name, size);
713}
714
715
716
717
718
719
720
721
722
723
724
725static int of_fdt_is_compatible(const void *blob,
726 unsigned long node, const char *compat)
727{
728 const char *cp;
729 int cplen;
730 unsigned long l, score = 0;
731
732 cp = fdt_getprop(blob, node, "compatible", &cplen);
733 if (cp == NULL)
734 return 0;
735 while (cplen > 0) {
736 score++;
737 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
738 return score;
739 l = strlen(cp) + 1;
740 cp += l;
741 cplen -= l;
742 }
743
744 return 0;
745}
746
747
748
749
750
751
752int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
753{
754 return of_fdt_is_compatible(initial_boot_params, node, compat);
755}
756
757
758
759
760static int __init of_flat_dt_match(unsigned long node, const char *const *compat)
761{
762 unsigned int tmp, score = 0;
763
764 if (!compat)
765 return 0;
766
767 while (*compat) {
768 tmp = of_fdt_is_compatible(initial_boot_params, node, *compat);
769 if (tmp && (score == 0 || (tmp < score)))
770 score = tmp;
771 compat++;
772 }
773
774 return score;
775}
776
777
778
779
780uint32_t __init of_get_flat_dt_phandle(unsigned long node)
781{
782 return fdt_get_phandle(initial_boot_params, node);
783}
784
785struct fdt_scan_status {
786 const char *name;
787 int namelen;
788 int depth;
789 int found;
790 int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
791 void *data;
792};
793
794const char * __init of_flat_dt_get_machine_name(void)
795{
796 const char *name;
797 unsigned long dt_root = of_get_flat_dt_root();
798
799 name = of_get_flat_dt_prop(dt_root, "model", NULL);
800 if (!name)
801 name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
802 return name;
803}
804
805
806
807
808
809
810
811
812
813
814const void * __init of_flat_dt_match_machine(const void *default_match,
815 const void * (*get_next_compat)(const char * const**))
816{
817 const void *data = NULL;
818 const void *best_data = default_match;
819 const char *const *compat;
820 unsigned long dt_root;
821 unsigned int best_score = ~1, score = 0;
822
823 dt_root = of_get_flat_dt_root();
824 while ((data = get_next_compat(&compat))) {
825 score = of_flat_dt_match(dt_root, compat);
826 if (score > 0 && score < best_score) {
827 best_data = data;
828 best_score = score;
829 }
830 }
831 if (!best_data) {
832 const char *prop;
833 int size;
834
835 pr_err("\n unrecognized device tree list:\n[ ");
836
837 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
838 if (prop) {
839 while (size > 0) {
840 printk("'%s' ", prop);
841 size -= strlen(prop) + 1;
842 prop += strlen(prop) + 1;
843 }
844 }
845 printk("]\n\n");
846 return NULL;
847 }
848
849 pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
850
851 return best_data;
852}
853
854#ifdef CONFIG_BLK_DEV_INITRD
855static void __early_init_dt_declare_initrd(unsigned long start,
856 unsigned long end)
857{
858
859
860
861
862
863 if (!IS_ENABLED(CONFIG_ARM64)) {
864 initrd_start = (unsigned long)__va(start);
865 initrd_end = (unsigned long)__va(end);
866 initrd_below_start_ok = 1;
867 }
868}
869
870
871
872
873
874static void __init early_init_dt_check_for_initrd(unsigned long node)
875{
876 u64 start, end;
877 int len;
878 const __be32 *prop;
879
880 pr_debug("Looking for initrd properties... ");
881
882 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
883 if (!prop)
884 return;
885 start = of_read_number(prop, len/4);
886
887 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
888 if (!prop)
889 return;
890 end = of_read_number(prop, len/4);
891
892 __early_init_dt_declare_initrd(start, end);
893 phys_initrd_start = start;
894 phys_initrd_size = end - start;
895
896 pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
897 (unsigned long long)start, (unsigned long long)end);
898}
899#else
900static inline void early_init_dt_check_for_initrd(unsigned long node)
901{
902}
903#endif
904
905#ifdef CONFIG_SERIAL_EARLYCON
906
907int __init early_init_dt_scan_chosen_stdout(void)
908{
909 int offset;
910 const char *p, *q, *options = NULL;
911 int l;
912 const struct earlycon_id **p_match;
913 const void *fdt = initial_boot_params;
914
915 offset = fdt_path_offset(fdt, "/chosen");
916 if (offset < 0)
917 offset = fdt_path_offset(fdt, "/chosen@0");
918 if (offset < 0)
919 return -ENOENT;
920
921 p = fdt_getprop(fdt, offset, "stdout-path", &l);
922 if (!p)
923 p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);
924 if (!p || !l)
925 return -ENOENT;
926
927 q = strchrnul(p, ':');
928 if (*q != '\0')
929 options = q + 1;
930 l = q - p;
931
932
933 offset = fdt_path_offset_namelen(fdt, p, l);
934 if (offset < 0) {
935 pr_warn("earlycon: stdout-path %.*s not found\n", l, p);
936 return 0;
937 }
938
939 for (p_match = __earlycon_table; p_match < __earlycon_table_end;
940 p_match++) {
941 const struct earlycon_id *match = *p_match;
942
943 if (!match->compatible[0])
944 continue;
945
946 if (fdt_node_check_compatible(fdt, offset, match->compatible))
947 continue;
948
949 of_setup_earlycon(match, offset, options);
950 return 0;
951 }
952 return -ENODEV;
953}
954#endif
955
956
957
958
959int __init early_init_dt_scan_root(unsigned long node, const char *uname,
960 int depth, void *data)
961{
962 const __be32 *prop;
963
964 if (depth != 0)
965 return 0;
966
967 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
968 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
969
970 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
971 if (prop)
972 dt_root_size_cells = be32_to_cpup(prop);
973 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
974
975 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
976 if (prop)
977 dt_root_addr_cells = be32_to_cpup(prop);
978 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
979
980
981 return 1;
982}
983
984u64 __init dt_mem_next_cell(int s, const __be32 **cellp)
985{
986 const __be32 *p = *cellp;
987
988 *cellp = p + s;
989 return of_read_number(p, s);
990}
991
992
993
994
995int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
996 int depth, void *data)
997{
998 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
999 const __be32 *reg, *endp;
1000 int l;
1001 bool hotpluggable;
1002
1003
1004 if (type == NULL || strcmp(type, "memory") != 0)
1005 return 0;
1006
1007 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
1008 if (reg == NULL)
1009 reg = of_get_flat_dt_prop(node, "reg", &l);
1010 if (reg == NULL)
1011 return 0;
1012
1013 endp = reg + (l / sizeof(__be32));
1014 hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL);
1015
1016 pr_debug("memory scan node %s, reg size %d,\n", uname, l);
1017
1018 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
1019 u64 base, size;
1020
1021 base = dt_mem_next_cell(dt_root_addr_cells, ®);
1022 size = dt_mem_next_cell(dt_root_size_cells, ®);
1023
1024 if (size == 0)
1025 continue;
1026 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
1027 (unsigned long long)size);
1028
1029 early_init_dt_add_memory_arch(base, size);
1030
1031 if (!hotpluggable)
1032 continue;
1033
1034 if (early_init_dt_mark_hotplug_memory_arch(base, size))
1035 pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n",
1036 base, base + size);
1037 }
1038
1039 return 0;
1040}
1041
1042int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
1043 int depth, void *data)
1044{
1045 int l;
1046 const char *p;
1047
1048 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
1049
1050 if (depth != 1 || !data ||
1051 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
1052 return 0;
1053
1054 early_init_dt_check_for_initrd(node);
1055
1056
1057 p = of_get_flat_dt_prop(node, "bootargs", &l);
1058 if (p != NULL && l > 0)
1059 strlcpy(data, p, min(l, COMMAND_LINE_SIZE));
1060
1061
1062
1063
1064
1065
1066#ifdef CONFIG_CMDLINE
1067#if defined(CONFIG_CMDLINE_EXTEND)
1068 strlcat(data, " ", COMMAND_LINE_SIZE);
1069 strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
1070#elif defined(CONFIG_CMDLINE_FORCE)
1071 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
1072#else
1073
1074 if (!((char *)data)[0])
1075 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
1076#endif
1077#endif
1078
1079 pr_debug("Command line is: %s\n", (char*)data);
1080
1081
1082 return 1;
1083}
1084
1085#ifndef MIN_MEMBLOCK_ADDR
1086#define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET)
1087#endif
1088#ifndef MAX_MEMBLOCK_ADDR
1089#define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0)
1090#endif
1091
1092void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
1093{
1094 const u64 phys_offset = MIN_MEMBLOCK_ADDR;
1095
1096 if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
1097 pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
1098 base, base + size);
1099 return;
1100 }
1101
1102 if (!PAGE_ALIGNED(base)) {
1103 size -= PAGE_SIZE - (base & ~PAGE_MASK);
1104 base = PAGE_ALIGN(base);
1105 }
1106 size &= PAGE_MASK;
1107
1108 if (base > MAX_MEMBLOCK_ADDR) {
1109 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
1110 base, base + size);
1111 return;
1112 }
1113
1114 if (base + size - 1 > MAX_MEMBLOCK_ADDR) {
1115 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
1116 ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size);
1117 size = MAX_MEMBLOCK_ADDR - base + 1;
1118 }
1119
1120 if (base + size < phys_offset) {
1121 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
1122 base, base + size);
1123 return;
1124 }
1125 if (base < phys_offset) {
1126 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
1127 base, phys_offset);
1128 size -= phys_offset - base;
1129 base = phys_offset;
1130 }
1131 memblock_add(base, size);
1132}
1133
1134int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size)
1135{
1136 return memblock_mark_hotplug(base, size);
1137}
1138
1139int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
1140 phys_addr_t size, bool nomap)
1141{
1142 if (nomap)
1143 return memblock_remove(base, size);
1144 return memblock_reserve(base, size);
1145}
1146
1147static void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
1148{
1149 void *ptr = memblock_alloc(size, align);
1150
1151 if (!ptr)
1152 panic("%s: Failed to allocate %llu bytes align=0x%llx\n",
1153 __func__, size, align);
1154
1155 return ptr;
1156}
1157
1158bool __init early_init_dt_verify(void *params)
1159{
1160 if (!params)
1161 return false;
1162
1163
1164 if (fdt_check_header(params))
1165 return false;
1166
1167
1168 initial_boot_params = params;
1169 of_fdt_crc32 = crc32_be(~0, initial_boot_params,
1170 fdt_totalsize(initial_boot_params));
1171 return true;
1172}
1173
1174
1175void __init early_init_dt_scan_nodes(void)
1176{
1177 int rc = 0;
1178
1179
1180 rc = of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
1181 if (!rc)
1182 pr_warn("No chosen node found, continuing without\n");
1183
1184
1185 of_scan_flat_dt(early_init_dt_scan_root, NULL);
1186
1187
1188 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1189}
1190
1191bool __init early_init_dt_scan(void *params)
1192{
1193 bool status;
1194
1195 status = early_init_dt_verify(params);
1196 if (!status)
1197 return false;
1198
1199 early_init_dt_scan_nodes();
1200 return true;
1201}
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211void __init unflatten_device_tree(void)
1212{
1213 __unflatten_device_tree(initial_boot_params, NULL, &of_root,
1214 early_init_dt_alloc_memory_arch, false);
1215
1216
1217 of_alias_scan(early_init_dt_alloc_memory_arch);
1218
1219 unittest_unflatten_overlay_base();
1220}
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233void __init unflatten_and_copy_device_tree(void)
1234{
1235 int size;
1236 void *dt;
1237
1238 if (!initial_boot_params) {
1239 pr_warn("No valid device tree found, continuing without\n");
1240 return;
1241 }
1242
1243 size = fdt_totalsize(initial_boot_params);
1244 dt = early_init_dt_alloc_memory_arch(size,
1245 roundup_pow_of_two(FDT_V17_SIZE));
1246
1247 if (dt) {
1248 memcpy(dt, initial_boot_params, size);
1249 initial_boot_params = dt;
1250 }
1251 unflatten_device_tree();
1252}
1253
1254#ifdef CONFIG_SYSFS
1255static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj,
1256 struct bin_attribute *bin_attr,
1257 char *buf, loff_t off, size_t count)
1258{
1259 memcpy(buf, initial_boot_params + off, count);
1260 return count;
1261}
1262
1263static int __init of_fdt_raw_init(void)
1264{
1265 static struct bin_attribute of_fdt_raw_attr =
1266 __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0);
1267
1268 if (!initial_boot_params)
1269 return 0;
1270
1271 if (of_fdt_crc32 != crc32_be(~0, initial_boot_params,
1272 fdt_totalsize(initial_boot_params))) {
1273 pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n");
1274 return 0;
1275 }
1276 of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params);
1277 return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr);
1278}
1279late_initcall(of_fdt_raw_init);
1280#endif
1281
1282#endif
1283