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12#include <linux/crc32.h>
13#include <linux/kernel.h>
14#include <linux/initrd.h>
15#include <linux/memblock.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
32
33
34
35
36
37
38
39void of_fdt_limit_memory(int limit)
40{
41 int memory;
42 int len;
43 const void *val;
44 int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
45 int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
46 const uint32_t *addr_prop;
47 const uint32_t *size_prop;
48 int root_offset;
49 int cell_size;
50
51 root_offset = fdt_path_offset(initial_boot_params, "/");
52 if (root_offset < 0)
53 return;
54
55 addr_prop = fdt_getprop(initial_boot_params, root_offset,
56 "#address-cells", NULL);
57 if (addr_prop)
58 nr_address_cells = fdt32_to_cpu(*addr_prop);
59
60 size_prop = fdt_getprop(initial_boot_params, root_offset,
61 "#size-cells", NULL);
62 if (size_prop)
63 nr_size_cells = fdt32_to_cpu(*size_prop);
64
65 cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells);
66
67 memory = fdt_path_offset(initial_boot_params, "/memory");
68 if (memory > 0) {
69 val = fdt_getprop(initial_boot_params, memory, "reg", &len);
70 if (len > limit*cell_size) {
71 len = limit*cell_size;
72 pr_debug("Limiting number of entries to %d\n", limit);
73 fdt_setprop(initial_boot_params, memory, "reg", val,
74 len);
75 }
76 }
77}
78
79
80
81
82
83
84
85
86
87
88
89int of_fdt_is_compatible(const void *blob,
90 unsigned long node, const char *compat)
91{
92 const char *cp;
93 int cplen;
94 unsigned long l, score = 0;
95
96 cp = fdt_getprop(blob, node, "compatible", &cplen);
97 if (cp == NULL)
98 return 0;
99 while (cplen > 0) {
100 score++;
101 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
102 return score;
103 l = strlen(cp) + 1;
104 cp += l;
105 cplen -= l;
106 }
107
108 return 0;
109}
110
111
112
113
114int of_fdt_match(const void *blob, unsigned long node,
115 const char *const *compat)
116{
117 unsigned int tmp, score = 0;
118
119 if (!compat)
120 return 0;
121
122 while (*compat) {
123 tmp = of_fdt_is_compatible(blob, node, *compat);
124 if (tmp && (score == 0 || (tmp < score)))
125 score = tmp;
126 compat++;
127 }
128
129 return score;
130}
131
132static void *unflatten_dt_alloc(void **mem, unsigned long size,
133 unsigned long align)
134{
135 void *res;
136
137 *mem = PTR_ALIGN(*mem, align);
138 res = *mem;
139 *mem += size;
140
141 return res;
142}
143
144
145
146
147
148
149
150
151
152static void * unflatten_dt_node(void *blob,
153 void *mem,
154 int *poffset,
155 struct device_node *dad,
156 struct device_node **nodepp,
157 unsigned long fpsize,
158 bool dryrun)
159{
160 const __be32 *p;
161 struct device_node *np;
162 struct property *pp, **prev_pp = NULL;
163 const char *pathp;
164 unsigned int l, allocl;
165 static int depth = 0;
166 int old_depth;
167 int offset;
168 int has_name = 0;
169 int new_format = 0;
170
171 pathp = fdt_get_name(blob, *poffset, &l);
172 if (!pathp)
173 return mem;
174
175 allocl = l++;
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 = "";
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 (!dryrun) {
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 if (dad != NULL) {
228 np->parent = dad;
229 np->sibling = dad->child;
230 dad->child = np;
231 }
232 }
233
234 for (offset = fdt_first_property_offset(blob, *poffset);
235 (offset >= 0);
236 (offset = fdt_next_property_offset(blob, offset))) {
237 const char *pname;
238 u32 sz;
239
240 if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) {
241 offset = -FDT_ERR_INTERNAL;
242 break;
243 }
244
245 if (pname == NULL) {
246 pr_info("Can't find property name in list !\n");
247 break;
248 }
249 if (strcmp(pname, "name") == 0)
250 has_name = 1;
251 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
252 __alignof__(struct property));
253 if (!dryrun) {
254
255
256
257
258
259 if ((strcmp(pname, "phandle") == 0) ||
260 (strcmp(pname, "linux,phandle") == 0)) {
261 if (np->phandle == 0)
262 np->phandle = be32_to_cpup(p);
263 }
264
265
266
267 if (strcmp(pname, "ibm,phandle") == 0)
268 np->phandle = be32_to_cpup(p);
269 pp->name = (char *)pname;
270 pp->length = sz;
271 pp->value = (__be32 *)p;
272 *prev_pp = pp;
273 prev_pp = &pp->next;
274 }
275 }
276
277
278
279 if (!has_name) {
280 const char *p1 = pathp, *ps = pathp, *pa = NULL;
281 int sz;
282
283 while (*p1) {
284 if ((*p1) == '@')
285 pa = p1;
286 if ((*p1) == '/')
287 ps = p1 + 1;
288 p1++;
289 }
290 if (pa < ps)
291 pa = p1;
292 sz = (pa - ps) + 1;
293 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
294 __alignof__(struct property));
295 if (!dryrun) {
296 pp->name = "name";
297 pp->length = sz;
298 pp->value = pp + 1;
299 *prev_pp = pp;
300 prev_pp = &pp->next;
301 memcpy(pp->value, ps, sz - 1);
302 ((char *)pp->value)[sz - 1] = 0;
303 pr_debug("fixed up name for %s -> %s\n", pathp,
304 (char *)pp->value);
305 }
306 }
307 if (!dryrun) {
308 *prev_pp = NULL;
309 np->name = of_get_property(np, "name", NULL);
310 np->type = of_get_property(np, "device_type", NULL);
311
312 if (!np->name)
313 np->name = "<NULL>";
314 if (!np->type)
315 np->type = "<NULL>";
316 }
317
318 old_depth = depth;
319 *poffset = fdt_next_node(blob, *poffset, &depth);
320 if (depth < 0)
321 depth = 0;
322 while (*poffset > 0 && depth > old_depth)
323 mem = unflatten_dt_node(blob, mem, poffset, np, NULL,
324 fpsize, dryrun);
325
326 if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND)
327 pr_err("unflatten: error %d processing FDT\n", *poffset);
328
329
330
331
332
333 if (!dryrun && np->child) {
334 struct device_node *child = np->child;
335 np->child = NULL;
336 while (child) {
337 struct device_node *next = child->sibling;
338 child->sibling = np->child;
339 np->child = child;
340 child = next;
341 }
342 }
343
344 if (nodepp)
345 *nodepp = np;
346
347 return mem;
348}
349
350
351
352
353
354
355
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357
358
359
360
361
362static void __unflatten_device_tree(void *blob,
363 struct device_node **mynodes,
364 void * (*dt_alloc)(u64 size, u64 align))
365{
366 unsigned long size;
367 int start;
368 void *mem;
369
370 pr_debug(" -> unflatten_device_tree()\n");
371
372 if (!blob) {
373 pr_debug("No device tree pointer\n");
374 return;
375 }
376
377 pr_debug("Unflattening device tree:\n");
378 pr_debug("magic: %08x\n", fdt_magic(blob));
379 pr_debug("size: %08x\n", fdt_totalsize(blob));
380 pr_debug("version: %08x\n", fdt_version(blob));
381
382 if (fdt_check_header(blob)) {
383 pr_err("Invalid device tree blob header\n");
384 return;
385 }
386
387
388 start = 0;
389 size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true);
390 size = ALIGN(size, 4);
391
392 pr_debug(" size is %lx, allocating...\n", size);
393
394
395 mem = dt_alloc(size + 4, __alignof__(struct device_node));
396 memset(mem, 0, size);
397
398 *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
399
400 pr_debug(" unflattening %p...\n", mem);
401
402
403 start = 0;
404 unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false);
405 if (be32_to_cpup(mem + size) != 0xdeadbeef)
406 pr_warning("End of tree marker overwritten: %08x\n",
407 be32_to_cpup(mem + size));
408
409 pr_debug(" <- unflatten_device_tree()\n");
410}
411
412static void *kernel_tree_alloc(u64 size, u64 align)
413{
414 return kzalloc(size, GFP_KERNEL);
415}
416
417
418
419
420
421
422
423
424
425void of_fdt_unflatten_tree(unsigned long *blob,
426 struct device_node **mynodes)
427{
428 __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);
429}
430EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
431
432
433int __initdata dt_root_addr_cells;
434int __initdata dt_root_size_cells;
435
436void *initial_boot_params;
437
438#ifdef CONFIG_OF_EARLY_FLATTREE
439
440static u32 of_fdt_crc32;
441
442
443
444
445static int __init __reserved_mem_reserve_reg(unsigned long node,
446 const char *uname)
447{
448 int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
449 phys_addr_t base, size;
450 int len;
451 const __be32 *prop;
452 int nomap, first = 1;
453
454 prop = of_get_flat_dt_prop(node, "reg", &len);
455 if (!prop)
456 return -ENOENT;
457
458 if (len && len % t_len != 0) {
459 pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
460 uname);
461 return -EINVAL;
462 }
463
464 nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
465
466 while (len >= t_len) {
467 base = dt_mem_next_cell(dt_root_addr_cells, &prop);
468 size = dt_mem_next_cell(dt_root_size_cells, &prop);
469
470 if (size &&
471 early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
472 pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
473 uname, &base, (unsigned long)size / SZ_1M);
474 else
475 pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
476 uname, &base, (unsigned long)size / SZ_1M);
477
478 len -= t_len;
479 if (first) {
480 fdt_reserved_mem_save_node(node, uname, base, size);
481 first = 0;
482 }
483 }
484 return 0;
485}
486
487
488
489
490
491
492static int __init __reserved_mem_check_root(unsigned long node)
493{
494 const __be32 *prop;
495
496 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
497 if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
498 return -EINVAL;
499
500 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
501 if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
502 return -EINVAL;
503
504 prop = of_get_flat_dt_prop(node, "ranges", NULL);
505 if (!prop)
506 return -EINVAL;
507 return 0;
508}
509
510
511
512
513static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
514 int depth, void *data)
515{
516 static int found;
517 const char *status;
518 int err;
519
520 if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
521 if (__reserved_mem_check_root(node) != 0) {
522 pr_err("Reserved memory: unsupported node format, ignoring\n");
523
524 return 1;
525 }
526 found = 1;
527
528 return 0;
529 } else if (!found) {
530
531 return 0;
532 } else if (found && depth < 2) {
533
534 return 1;
535 }
536
537 status = of_get_flat_dt_prop(node, "status", NULL);
538 if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
539 return 0;
540
541 err = __reserved_mem_reserve_reg(node, uname);
542 if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
543 fdt_reserved_mem_save_node(node, uname, 0, 0);
544
545
546 return 0;
547}
548
549
550
551
552
553
554
555
556void __init early_init_fdt_scan_reserved_mem(void)
557{
558 int n;
559 u64 base, size;
560
561 if (!initial_boot_params)
562 return;
563
564
565 early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
566 fdt_totalsize(initial_boot_params),
567 0);
568
569
570 for (n = 0; ; n++) {
571 fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
572 if (!size)
573 break;
574 early_init_dt_reserve_memory_arch(base, size, 0);
575 }
576
577 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
578 fdt_init_reserved_mem();
579}
580
581
582
583
584
585
586
587
588
589
590int __init of_scan_flat_dt(int (*it)(unsigned long node,
591 const char *uname, int depth,
592 void *data),
593 void *data)
594{
595 const void *blob = initial_boot_params;
596 const char *pathp;
597 int offset, rc = 0, depth = -1;
598
599 for (offset = fdt_next_node(blob, -1, &depth);
600 offset >= 0 && depth >= 0 && !rc;
601 offset = fdt_next_node(blob, offset, &depth)) {
602
603 pathp = fdt_get_name(blob, offset, NULL);
604 if (*pathp == '/')
605 pathp = kbasename(pathp);
606 rc = it(offset, pathp, depth, data);
607 }
608 return rc;
609}
610
611
612
613
614unsigned long __init of_get_flat_dt_root(void)
615{
616 return 0;
617}
618
619
620
621
622int __init of_get_flat_dt_size(void)
623{
624 return fdt_totalsize(initial_boot_params);
625}
626
627
628
629
630
631
632
633const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
634 int *size)
635{
636 return fdt_getprop(initial_boot_params, node, name, size);
637}
638
639
640
641
642
643
644int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
645{
646 return of_fdt_is_compatible(initial_boot_params, node, compat);
647}
648
649
650
651
652int __init of_flat_dt_match(unsigned long node, const char *const *compat)
653{
654 return of_fdt_match(initial_boot_params, node, compat);
655}
656
657struct fdt_scan_status {
658 const char *name;
659 int namelen;
660 int depth;
661 int found;
662 int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
663 void *data;
664};
665
666const char * __init of_flat_dt_get_machine_name(void)
667{
668 const char *name;
669 unsigned long dt_root = of_get_flat_dt_root();
670
671 name = of_get_flat_dt_prop(dt_root, "model", NULL);
672 if (!name)
673 name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
674 return name;
675}
676
677
678
679
680
681
682
683
684
685
686const void * __init of_flat_dt_match_machine(const void *default_match,
687 const void * (*get_next_compat)(const char * const**))
688{
689 const void *data = NULL;
690 const void *best_data = default_match;
691 const char *const *compat;
692 unsigned long dt_root;
693 unsigned int best_score = ~1, score = 0;
694
695 dt_root = of_get_flat_dt_root();
696 while ((data = get_next_compat(&compat))) {
697 score = of_flat_dt_match(dt_root, compat);
698 if (score > 0 && score < best_score) {
699 best_data = data;
700 best_score = score;
701 }
702 }
703 if (!best_data) {
704 const char *prop;
705 int size;
706
707 pr_err("\n unrecognized device tree list:\n[ ");
708
709 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
710 if (prop) {
711 while (size > 0) {
712 printk("'%s' ", prop);
713 size -= strlen(prop) + 1;
714 prop += strlen(prop) + 1;
715 }
716 }
717 printk("]\n\n");
718 return NULL;
719 }
720
721 pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
722
723 return best_data;
724}
725
726#ifdef CONFIG_BLK_DEV_INITRD
727
728
729
730
731static void __init early_init_dt_check_for_initrd(unsigned long node)
732{
733 u64 start, end;
734 int len;
735 const __be32 *prop;
736
737 pr_debug("Looking for initrd properties... ");
738
739 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
740 if (!prop)
741 return;
742 start = of_read_number(prop, len/4);
743
744 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
745 if (!prop)
746 return;
747 end = of_read_number(prop, len/4);
748
749 initrd_start = (unsigned long)__va(start);
750 initrd_end = (unsigned long)__va(end);
751 initrd_below_start_ok = 1;
752
753 pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
754 (unsigned long long)start, (unsigned long long)end);
755}
756#else
757static inline void early_init_dt_check_for_initrd(unsigned long node)
758{
759}
760#endif
761
762#ifdef CONFIG_SERIAL_EARLYCON
763extern struct of_device_id __earlycon_of_table[];
764
765static int __init early_init_dt_scan_chosen_serial(void)
766{
767 int offset;
768 const char *p;
769 int l;
770 const struct of_device_id *match = __earlycon_of_table;
771 const void *fdt = initial_boot_params;
772
773 offset = fdt_path_offset(fdt, "/chosen");
774 if (offset < 0)
775 offset = fdt_path_offset(fdt, "/chosen@0");
776 if (offset < 0)
777 return -ENOENT;
778
779 p = fdt_getprop(fdt, offset, "stdout-path", &l);
780 if (!p)
781 p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);
782 if (!p || !l)
783 return -ENOENT;
784
785
786 offset = fdt_path_offset(fdt, p);
787 if (offset < 0)
788 return -ENODEV;
789
790 while (match->compatible[0]) {
791 unsigned long addr;
792 if (fdt_node_check_compatible(fdt, offset, match->compatible)) {
793 match++;
794 continue;
795 }
796
797 addr = fdt_translate_address(fdt, offset);
798 if (!addr)
799 return -ENXIO;
800
801 of_setup_earlycon(addr, match->data);
802 return 0;
803 }
804 return -ENODEV;
805}
806
807static int __init setup_of_earlycon(char *buf)
808{
809 if (buf)
810 return 0;
811
812 return early_init_dt_scan_chosen_serial();
813}
814early_param("earlycon", setup_of_earlycon);
815#endif
816
817
818
819
820int __init early_init_dt_scan_root(unsigned long node, const char *uname,
821 int depth, void *data)
822{
823 const __be32 *prop;
824
825 if (depth != 0)
826 return 0;
827
828 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
829 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
830
831 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
832 if (prop)
833 dt_root_size_cells = be32_to_cpup(prop);
834 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
835
836 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
837 if (prop)
838 dt_root_addr_cells = be32_to_cpup(prop);
839 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
840
841
842 return 1;
843}
844
845u64 __init dt_mem_next_cell(int s, const __be32 **cellp)
846{
847 const __be32 *p = *cellp;
848
849 *cellp = p + s;
850 return of_read_number(p, s);
851}
852
853
854
855
856int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
857 int depth, void *data)
858{
859 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
860 const __be32 *reg, *endp;
861 int l;
862
863
864 if (type == NULL) {
865
866
867
868
869 if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0)
870 return 0;
871 } else if (strcmp(type, "memory") != 0)
872 return 0;
873
874 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
875 if (reg == NULL)
876 reg = of_get_flat_dt_prop(node, "reg", &l);
877 if (reg == NULL)
878 return 0;
879
880 endp = reg + (l / sizeof(__be32));
881
882 pr_debug("memory scan node %s, reg size %d, data: %x %x %x %x,\n",
883 uname, l, reg[0], reg[1], reg[2], reg[3]);
884
885 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
886 u64 base, size;
887
888 base = dt_mem_next_cell(dt_root_addr_cells, ®);
889 size = dt_mem_next_cell(dt_root_size_cells, ®);
890
891 if (size == 0)
892 continue;
893 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
894 (unsigned long long)size);
895
896 early_init_dt_add_memory_arch(base, size);
897 }
898
899 return 0;
900}
901
902int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
903 int depth, void *data)
904{
905 int l;
906 const char *p;
907
908 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
909
910 if (depth != 1 || !data ||
911 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
912 return 0;
913
914 early_init_dt_check_for_initrd(node);
915
916
917 p = of_get_flat_dt_prop(node, "bootargs", &l);
918 if (p != NULL && l > 0)
919 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
920
921
922
923
924
925
926#ifdef CONFIG_CMDLINE
927#ifndef CONFIG_CMDLINE_FORCE
928 if (!((char *)data)[0])
929#endif
930 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
931#endif
932
933 pr_debug("Command line is: %s\n", (char*)data);
934
935
936 return 1;
937}
938
939#ifdef CONFIG_HAVE_MEMBLOCK
940#define MAX_PHYS_ADDR ((phys_addr_t)~0)
941
942void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
943{
944 const u64 phys_offset = __pa(PAGE_OFFSET);
945
946 if (!PAGE_ALIGNED(base)) {
947 if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
948 pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
949 base, base + size);
950 return;
951 }
952 size -= PAGE_SIZE - (base & ~PAGE_MASK);
953 base = PAGE_ALIGN(base);
954 }
955 size &= PAGE_MASK;
956
957 if (base > MAX_PHYS_ADDR) {
958 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
959 base, base + size);
960 return;
961 }
962
963 if (base + size - 1 > MAX_PHYS_ADDR) {
964 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
965 ((u64)MAX_PHYS_ADDR) + 1, base + size);
966 size = MAX_PHYS_ADDR - base + 1;
967 }
968
969 if (base + size < phys_offset) {
970 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
971 base, base + size);
972 return;
973 }
974 if (base < phys_offset) {
975 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
976 base, phys_offset);
977 size -= phys_offset - base;
978 base = phys_offset;
979 }
980 memblock_add(base, size);
981}
982
983int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
984 phys_addr_t size, bool nomap)
985{
986 if (nomap)
987 return memblock_remove(base, size);
988 return memblock_reserve(base, size);
989}
990
991
992
993
994
995void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
996{
997 return __va(memblock_alloc(size, align));
998}
999#else
1000int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
1001 phys_addr_t size, bool nomap)
1002{
1003 pr_err("Reserved memory not supported, ignoring range 0x%pa - 0x%pa%s\n",
1004 &base, &size, nomap ? " (nomap)" : "");
1005 return -ENOSYS;
1006}
1007#endif
1008
1009bool __init early_init_dt_verify(void *params)
1010{
1011 if (!params)
1012 return false;
1013
1014
1015 if (fdt_check_header(params))
1016 return false;
1017
1018
1019 initial_boot_params = params;
1020 of_fdt_crc32 = crc32_be(~0, initial_boot_params,
1021 fdt_totalsize(initial_boot_params));
1022 return true;
1023}
1024
1025
1026void __init early_init_dt_scan_nodes(void)
1027{
1028
1029 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
1030
1031
1032 of_scan_flat_dt(early_init_dt_scan_root, NULL);
1033
1034
1035 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1036}
1037
1038bool __init early_init_dt_scan(void *params)
1039{
1040 bool status;
1041
1042 status = early_init_dt_verify(params);
1043 if (!status)
1044 return false;
1045
1046 early_init_dt_scan_nodes();
1047 return true;
1048}
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058void __init unflatten_device_tree(void)
1059{
1060 __unflatten_device_tree(initial_boot_params, &of_root,
1061 early_init_dt_alloc_memory_arch);
1062
1063
1064 of_alias_scan(early_init_dt_alloc_memory_arch);
1065}
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078void __init unflatten_and_copy_device_tree(void)
1079{
1080 int size;
1081 void *dt;
1082
1083 if (!initial_boot_params) {
1084 pr_warn("No valid device tree found, continuing without\n");
1085 return;
1086 }
1087
1088 size = fdt_totalsize(initial_boot_params);
1089 dt = early_init_dt_alloc_memory_arch(size,
1090 roundup_pow_of_two(FDT_V17_SIZE));
1091
1092 if (dt) {
1093 memcpy(dt, initial_boot_params, size);
1094 initial_boot_params = dt;
1095 }
1096 unflatten_device_tree();
1097}
1098
1099#ifdef CONFIG_SYSFS
1100static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj,
1101 struct bin_attribute *bin_attr,
1102 char *buf, loff_t off, size_t count)
1103{
1104 memcpy(buf, initial_boot_params + off, count);
1105 return count;
1106}
1107
1108static int __init of_fdt_raw_init(void)
1109{
1110 static struct bin_attribute of_fdt_raw_attr =
1111 __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0);
1112
1113 if (!initial_boot_params)
1114 return 0;
1115
1116 if (of_fdt_crc32 != crc32_be(~0, initial_boot_params,
1117 fdt_totalsize(initial_boot_params))) {
1118 pr_warn("fdt: not creating '/sys/firmware/fdt': CRC check failed\n");
1119 return 0;
1120 }
1121 of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params);
1122 return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr);
1123}
1124late_initcall(of_fdt_raw_init);
1125#endif
1126
1127#endif
1128