2 * Functions for working with the Flattened Device Tree data format
4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
5 * benh@kernel.crashing.org
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.
12 #include <linux/kernel.h>
13 #include <linux/initrd.h>
14 #include <linux/memblock.h>
15 #include <linux/module.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>
24 #include <asm/setup.h> /* for COMMAND_LINE_SIZE */
26 #include <asm/machdep.h>
27 #endif /* CONFIG_PPC */
31 char *of_fdt_get_string(struct boot_param_header
*blob
, u32 offset
)
33 return ((char *)blob
) +
34 be32_to_cpu(blob
->off_dt_strings
) + offset
;
38 * of_fdt_get_property - Given a node in the given flat blob, return
41 void *of_fdt_get_property(struct boot_param_header
*blob
,
42 unsigned long node
, const char *name
,
45 unsigned long p
= node
;
48 u32 tag
= be32_to_cpup((__be32
*)p
);
55 if (tag
!= OF_DT_PROP
)
58 sz
= be32_to_cpup((__be32
*)p
);
59 noff
= be32_to_cpup((__be32
*)(p
+ 4));
61 if (be32_to_cpu(blob
->version
) < 0x10)
62 p
= ALIGN(p
, sz
>= 8 ? 8 : 4);
64 nstr
= of_fdt_get_string(blob
, noff
);
66 pr_warning("Can't find property index name !\n");
69 if (strcmp(name
, nstr
) == 0) {
80 * of_fdt_is_compatible - Return true if given node from the given blob has
81 * compat in its compatible list
82 * @blob: A device tree blob
84 * @compat: compatible string to compare with compatible list.
86 * On match, returns a non-zero value with smaller values returned for more
87 * specific compatible values.
89 int of_fdt_is_compatible(struct boot_param_header
*blob
,
90 unsigned long node
, const char *compat
)
93 unsigned long cplen
, l
, score
= 0;
95 cp
= of_fdt_get_property(blob
, node
, "compatible", &cplen
);
100 if (of_compat_cmp(cp
, compat
, strlen(compat
)) == 0)
111 * of_fdt_match - Return true if node matches a list of compatible values
113 int of_fdt_match(struct boot_param_header
*blob
, unsigned long node
,
114 const char *const *compat
)
116 unsigned int tmp
, score
= 0;
122 tmp
= of_fdt_is_compatible(blob
, node
, *compat
);
123 if (tmp
&& (score
== 0 || (tmp
< score
)))
131 static void *unflatten_dt_alloc(unsigned long *mem
, unsigned long size
,
136 *mem
= ALIGN(*mem
, align
);
144 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
145 * @blob: The parent device tree blob
146 * @mem: Memory chunk to use for allocating device nodes and properties
147 * @p: pointer to node in flat tree
148 * @dad: Parent struct device_node
149 * @allnextpp: pointer to ->allnext from last allocated device_node
150 * @fpsize: Size of the node path up at the current depth.
152 static unsigned long unflatten_dt_node(struct boot_param_header
*blob
,
155 struct device_node
*dad
,
156 struct device_node
***allnextpp
,
157 unsigned long fpsize
)
159 struct device_node
*np
;
160 struct property
*pp
, **prev_pp
= NULL
;
163 unsigned int l
, allocl
;
167 tag
= be32_to_cpup((__be32
*)(*p
));
168 if (tag
!= OF_DT_BEGIN_NODE
) {
169 pr_err("Weird tag at start of node: %x\n", tag
);
174 l
= allocl
= strlen(pathp
) + 1;
175 *p
= ALIGN(*p
+ l
, 4);
177 /* version 0x10 has a more compact unit name here instead of the full
178 * path. we accumulate the full path size using "fpsize", we'll rebuild
179 * it later. We detect this because the first character of the name is
182 if ((*pathp
) != '/') {
185 /* root node: special case. fpsize accounts for path
186 * plus terminating zero. root node only has '/', so
187 * fpsize should be 2, but we want to avoid the first
188 * level nodes to have two '/' so we use fpsize 1 here
195 /* account for '/' and path size minus terminal 0
203 np
= unflatten_dt_alloc(&mem
, sizeof(struct device_node
) + allocl
,
204 __alignof__(struct device_node
));
207 memset(np
, 0, sizeof(*np
));
208 np
->full_name
= fn
= ((char *)np
) + sizeof(*np
);
210 /* rebuild full path for new format */
211 if (dad
&& dad
->parent
) {
212 strcpy(fn
, dad
->full_name
);
214 if ((strlen(fn
) + l
+ 1) != allocl
) {
215 pr_debug("%s: p: %d, l: %d, a: %d\n",
216 pathp
, (int)strlen(fn
),
224 memcpy(fn
, pathp
, l
);
226 prev_pp
= &np
->properties
;
228 *allnextpp
= &np
->allnext
;
231 /* we temporarily use the next field as `last_child'*/
232 if (dad
->next
== NULL
)
235 dad
->next
->sibling
= np
;
238 kref_init(&np
->kref
);
240 /* process properties */
245 tag
= be32_to_cpup((__be32
*)(*p
));
246 if (tag
== OF_DT_NOP
) {
250 if (tag
!= OF_DT_PROP
)
253 sz
= be32_to_cpup((__be32
*)(*p
));
254 noff
= be32_to_cpup((__be32
*)((*p
) + 4));
256 if (be32_to_cpu(blob
->version
) < 0x10)
257 *p
= ALIGN(*p
, sz
>= 8 ? 8 : 4);
259 pname
= of_fdt_get_string(blob
, noff
);
261 pr_info("Can't find property name in list !\n");
264 if (strcmp(pname
, "name") == 0)
266 l
= strlen(pname
) + 1;
267 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
),
268 __alignof__(struct property
));
270 /* We accept flattened tree phandles either in
271 * ePAPR-style "phandle" properties, or the
272 * legacy "linux,phandle" properties. If both
273 * appear and have different values, things
274 * will get weird. Don't do that. */
275 if ((strcmp(pname
, "phandle") == 0) ||
276 (strcmp(pname
, "linux,phandle") == 0)) {
277 if (np
->phandle
== 0)
278 np
->phandle
= be32_to_cpup((__be32
*)*p
);
280 /* And we process the "ibm,phandle" property
281 * used in pSeries dynamic device tree
283 if (strcmp(pname
, "ibm,phandle") == 0)
284 np
->phandle
= be32_to_cpup((__be32
*)*p
);
287 pp
->value
= (void *)*p
;
291 *p
= ALIGN((*p
) + sz
, 4);
293 /* with version 0x10 we may not have the name property, recreate
294 * it here from the unit name if absent
297 char *p1
= pathp
, *ps
= pathp
, *pa
= NULL
;
310 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
) + sz
,
311 __alignof__(struct property
));
318 memcpy(pp
->value
, ps
, sz
- 1);
319 ((char *)pp
->value
)[sz
- 1] = 0;
320 pr_debug("fixed up name for %s -> %s\n", pathp
,
326 np
->name
= of_get_property(np
, "name", NULL
);
327 np
->type
= of_get_property(np
, "device_type", NULL
);
334 while (tag
== OF_DT_BEGIN_NODE
|| tag
== OF_DT_NOP
) {
335 if (tag
== OF_DT_NOP
)
338 mem
= unflatten_dt_node(blob
, mem
, p
, np
, allnextpp
,
340 tag
= be32_to_cpup((__be32
*)(*p
));
342 if (tag
!= OF_DT_END_NODE
) {
343 pr_err("Weird tag at end of node: %x\n", tag
);
351 * __unflatten_device_tree - create tree of device_nodes from flat blob
353 * unflattens a device-tree, creating the
354 * tree of struct device_node. It also fills the "name" and "type"
355 * pointers of the nodes so the normal device-tree walking functions
357 * @blob: The blob to expand
358 * @mynodes: The device_node tree created by the call
359 * @dt_alloc: An allocator that provides a virtual address to memory
360 * for the resulting tree
362 static void __unflatten_device_tree(struct boot_param_header
*blob
,
363 struct device_node
**mynodes
,
364 void * (*dt_alloc
)(u64 size
, u64 align
))
366 unsigned long start
, mem
, size
;
367 struct device_node
**allnextp
= mynodes
;
369 pr_debug(" -> unflatten_device_tree()\n");
372 pr_debug("No device tree pointer\n");
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
));
381 if (be32_to_cpu(blob
->magic
) != OF_DT_HEADER
) {
382 pr_err("Invalid device tree blob header\n");
386 /* First pass, scan for size */
387 start
= ((unsigned long)blob
) +
388 be32_to_cpu(blob
->off_dt_struct
);
389 size
= unflatten_dt_node(blob
, 0, &start
, NULL
, NULL
, 0);
390 size
= (size
| 3) + 1;
392 pr_debug(" size is %lx, allocating...\n", size
);
394 /* Allocate memory for the expanded device tree */
395 mem
= (unsigned long)
396 dt_alloc(size
+ 4, __alignof__(struct device_node
));
398 memset((void *)mem
, 0, size
);
400 ((__be32
*)mem
)[size
/ 4] = cpu_to_be32(0xdeadbeef);
402 pr_debug(" unflattening %lx...\n", mem
);
404 /* Second pass, do actual unflattening */
405 start
= ((unsigned long)blob
) +
406 be32_to_cpu(blob
->off_dt_struct
);
407 unflatten_dt_node(blob
, mem
, &start
, NULL
, &allnextp
, 0);
408 if (be32_to_cpup((__be32
*)start
) != OF_DT_END
)
409 pr_warning("Weird tag at end of tree: %08x\n", *((u32
*)start
));
410 if (be32_to_cpu(((__be32
*)mem
)[size
/ 4]) != 0xdeadbeef)
411 pr_warning("End of tree marker overwritten: %08x\n",
412 be32_to_cpu(((__be32
*)mem
)[size
/ 4]));
415 pr_debug(" <- unflatten_device_tree()\n");
418 static void *kernel_tree_alloc(u64 size
, u64 align
)
420 return kzalloc(size
, GFP_KERNEL
);
424 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
426 * unflattens the device-tree passed by the firmware, creating the
427 * tree of struct device_node. It also fills the "name" and "type"
428 * pointers of the nodes so the normal device-tree walking functions
431 void of_fdt_unflatten_tree(unsigned long *blob
,
432 struct device_node
**mynodes
)
434 struct boot_param_header
*device_tree
=
435 (struct boot_param_header
*)blob
;
436 __unflatten_device_tree(device_tree
, mynodes
, &kernel_tree_alloc
);
438 EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree
);
440 /* Everything below here references initial_boot_params directly. */
441 int __initdata dt_root_addr_cells
;
442 int __initdata dt_root_size_cells
;
444 struct boot_param_header
*initial_boot_params
;
446 #ifdef CONFIG_OF_EARLY_FLATTREE
449 * res_mem_reserve_reg() - reserve all memory described in 'reg' property
451 static int __init
__reserved_mem_reserve_reg(unsigned long node
,
454 int t_len
= (dt_root_addr_cells
+ dt_root_size_cells
) * sizeof(__be32
);
455 phys_addr_t base
, size
;
458 int nomap
, first
= 1;
460 prop
= of_get_flat_dt_prop(node
, "reg", &len
);
464 if (len
&& len
% t_len
!= 0) {
465 pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
470 nomap
= of_get_flat_dt_prop(node
, "no-map", NULL
) != NULL
;
472 while (len
>= t_len
) {
473 base
= dt_mem_next_cell(dt_root_addr_cells
, &prop
);
474 size
= dt_mem_next_cell(dt_root_size_cells
, &prop
);
477 early_init_dt_reserve_memory_arch(base
, size
, nomap
) == 0)
478 pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
479 uname
, &base
, (unsigned long)size
/ SZ_1M
);
481 pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
482 uname
, &base
, (unsigned long)size
/ SZ_1M
);
486 fdt_reserved_mem_save_node(node
, uname
, base
, size
);
494 * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
495 * in /reserved-memory matches the values supported by the current implementation,
496 * also check if ranges property has been provided
498 static int __reserved_mem_check_root(unsigned long node
)
502 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
503 if (!prop
|| be32_to_cpup(prop
) != dt_root_size_cells
)
506 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
507 if (!prop
|| be32_to_cpup(prop
) != dt_root_addr_cells
)
510 prop
= of_get_flat_dt_prop(node
, "ranges", NULL
);
517 * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
519 static int __init
__fdt_scan_reserved_mem(unsigned long node
, const char *uname
,
520 int depth
, void *data
)
526 if (!found
&& depth
== 1 && strcmp(uname
, "reserved-memory") == 0) {
527 if (__reserved_mem_check_root(node
) != 0) {
528 pr_err("Reserved memory: unsupported node format, ignoring\n");
538 } else if (found
&& depth
< 2) {
539 /* scanning of /reserved-memory has been finished */
543 status
= of_get_flat_dt_prop(node
, "status", NULL
);
544 if (status
&& strcmp(status
, "okay") != 0 && strcmp(status
, "ok") != 0)
547 err
= __reserved_mem_reserve_reg(node
, uname
);
548 if (err
== -ENOENT
&& of_get_flat_dt_prop(node
, "size", NULL
))
549 fdt_reserved_mem_save_node(node
, uname
, 0, 0);
556 * early_init_fdt_scan_reserved_mem() - create reserved memory regions
558 * This function grabs memory from early allocator for device exclusive use
559 * defined in device tree structures. It should be called by arch specific code
560 * once the early allocator (i.e. memblock) has been fully activated.
562 void __init
early_init_fdt_scan_reserved_mem(void)
564 of_scan_flat_dt(__fdt_scan_reserved_mem
, NULL
);
565 fdt_init_reserved_mem();
569 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
570 * @it: callback function
571 * @data: context data pointer
573 * This function is used to scan the flattened device-tree, it is
574 * used to extract the memory information at boot before we can
577 int __init
of_scan_flat_dt(int (*it
)(unsigned long node
,
578 const char *uname
, int depth
,
582 unsigned long p
= ((unsigned long)initial_boot_params
) +
583 be32_to_cpu(initial_boot_params
->off_dt_struct
);
588 u32 tag
= be32_to_cpup((__be32
*)p
);
592 if (tag
== OF_DT_END_NODE
) {
596 if (tag
== OF_DT_NOP
)
598 if (tag
== OF_DT_END
)
600 if (tag
== OF_DT_PROP
) {
601 u32 sz
= be32_to_cpup((__be32
*)p
);
603 if (be32_to_cpu(initial_boot_params
->version
) < 0x10)
604 p
= ALIGN(p
, sz
>= 8 ? 8 : 4);
609 if (tag
!= OF_DT_BEGIN_NODE
) {
610 pr_err("Invalid tag %x in flat device tree!\n", tag
);
615 p
= ALIGN(p
+ strlen(pathp
) + 1, 4);
617 pathp
= kbasename(pathp
);
618 rc
= it(p
, pathp
, depth
, data
);
627 * of_get_flat_dt_root - find the root node in the flat blob
629 unsigned long __init
of_get_flat_dt_root(void)
631 unsigned long p
= ((unsigned long)initial_boot_params
) +
632 be32_to_cpu(initial_boot_params
->off_dt_struct
);
634 while (be32_to_cpup((__be32
*)p
) == OF_DT_NOP
)
636 BUG_ON(be32_to_cpup((__be32
*)p
) != OF_DT_BEGIN_NODE
);
638 return ALIGN(p
+ strlen((char *)p
) + 1, 4);
642 * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
644 * This function can be used within scan_flattened_dt callback to get
645 * access to properties
647 void *__init
of_get_flat_dt_prop(unsigned long node
, const char *name
,
650 return of_fdt_get_property(initial_boot_params
, node
, name
, size
);
654 * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
655 * @node: node to test
656 * @compat: compatible string to compare with compatible list.
658 int __init
of_flat_dt_is_compatible(unsigned long node
, const char *compat
)
660 return of_fdt_is_compatible(initial_boot_params
, node
, compat
);
664 * of_flat_dt_match - Return true if node matches a list of compatible values
666 int __init
of_flat_dt_match(unsigned long node
, const char *const *compat
)
668 return of_fdt_match(initial_boot_params
, node
, compat
);
671 struct fdt_scan_status
{
676 int (*iterator
)(unsigned long node
, const char *uname
, int depth
, void *data
);
681 * fdt_scan_node_by_path - iterator for of_scan_flat_dt_by_path function
683 static int __init
fdt_scan_node_by_path(unsigned long node
, const char *uname
,
684 int depth
, void *data
)
686 struct fdt_scan_status
*st
= data
;
689 * if scan at the requested fdt node has been completed,
690 * return -ENXIO to abort further scanning
692 if (depth
<= st
->depth
)
695 /* requested fdt node has been found, so call iterator function */
697 return st
->iterator(node
, uname
, depth
, st
->data
);
699 /* check if scanning automata is entering next level of fdt nodes */
700 if (depth
== st
->depth
+ 1 &&
701 strncmp(st
->name
, uname
, st
->namelen
) == 0 &&
702 uname
[st
->namelen
] == 0) {
704 if (st
->name
[st
->namelen
] == 0) {
707 const char *next
= st
->name
+ st
->namelen
+ 1;
709 st
->namelen
= strcspn(next
, "/");
714 /* scan next fdt node */
719 * of_scan_flat_dt_by_path - scan flattened tree blob and call callback on each
720 * child of the given path.
721 * @path: path to start searching for children
722 * @it: callback function
723 * @data: context data pointer
725 * This function is used to scan the flattened device-tree starting from the
726 * node given by path. It is used to extract information (like reserved
727 * memory), which is required on ealy boot before we can unflatten the tree.
729 int __init
of_scan_flat_dt_by_path(const char *path
,
730 int (*it
)(unsigned long node
, const char *name
, int depth
, void *data
),
733 struct fdt_scan_status st
= {path
, 0, -1, 0, it
, data
};
736 if (initial_boot_params
)
737 ret
= of_scan_flat_dt(fdt_scan_node_by_path
, &st
);
741 else if (ret
== -ENXIO
) /* scan has been completed */
747 #ifdef CONFIG_BLK_DEV_INITRD
749 * early_init_dt_check_for_initrd - Decode initrd location from flat tree
750 * @node: reference to node containing initrd location ('chosen')
752 void __init
early_init_dt_check_for_initrd(unsigned long node
)
754 unsigned long start
, end
, len
;
757 pr_debug("Looking for initrd properties... ");
759 prop
= of_get_flat_dt_prop(node
, "linux,initrd-start", &len
);
762 start
= of_read_ulong(prop
, len
/4);
764 prop
= of_get_flat_dt_prop(node
, "linux,initrd-end", &len
);
767 end
= of_read_ulong(prop
, len
/4);
769 early_init_dt_setup_initrd_arch(start
, end
);
770 pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start
, end
);
773 inline void early_init_dt_check_for_initrd(unsigned long node
)
776 #endif /* CONFIG_BLK_DEV_INITRD */
779 * early_init_dt_scan_root - fetch the top level address and size cells
781 int __init
early_init_dt_scan_root(unsigned long node
, const char *uname
,
782 int depth
, void *data
)
789 dt_root_size_cells
= OF_ROOT_NODE_SIZE_CELLS_DEFAULT
;
790 dt_root_addr_cells
= OF_ROOT_NODE_ADDR_CELLS_DEFAULT
;
792 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
794 dt_root_size_cells
= be32_to_cpup(prop
);
795 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells
);
797 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
799 dt_root_addr_cells
= be32_to_cpup(prop
);
800 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
806 u64 __init
dt_mem_next_cell(int s
, __be32
**cellp
)
811 return of_read_number(p
, s
);
815 * early_init_dt_scan_memory - Look for an parse memory nodes
817 int __init
early_init_dt_scan_memory(unsigned long node
, const char *uname
,
818 int depth
, void *data
)
820 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
824 /* We are scanning "memory" nodes only */
827 * The longtrail doesn't have a device_type on the
828 * /memory node, so look for the node called /memory@0.
830 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
832 } else if (strcmp(type
, "memory") != 0)
835 reg
= of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
837 reg
= of_get_flat_dt_prop(node
, "reg", &l
);
841 endp
= reg
+ (l
/ sizeof(__be32
));
843 pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
844 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
846 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
849 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
850 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
854 pr_debug(" - %llx , %llx\n", (unsigned long long)base
,
855 (unsigned long long)size
);
857 early_init_dt_add_memory_arch(base
, size
);
863 int __init __weak
early_init_dt_reserve_memory_arch(phys_addr_t base
,
864 phys_addr_t size
, bool nomap
)
866 if (memblock_is_region_reserved(base
, size
))
869 return memblock_remove(base
, size
);
870 return memblock_reserve(base
, size
);
874 * Convert configs to something easy to use in C code
876 #if defined(CONFIG_CMDLINE_FORCE)
877 static const int overwrite_incoming_cmdline
= 1;
878 static const int read_dt_cmdline
;
879 static const int concat_cmdline
;
880 #elif defined(CONFIG_CMDLINE_EXTEND)
881 static const int overwrite_incoming_cmdline
;
882 static const int read_dt_cmdline
= 1;
883 static const int concat_cmdline
= 1;
884 #else /* CMDLINE_FROM_BOOTLOADER */
885 static const int overwrite_incoming_cmdline
;
886 static const int read_dt_cmdline
= 1;
887 static const int concat_cmdline
;
890 #ifdef CONFIG_CMDLINE
891 static const char *config_cmdline
= CONFIG_CMDLINE
;
893 static const char *config_cmdline
= "";
896 int __init
early_init_dt_scan_chosen(unsigned long node
, const char *uname
,
897 int depth
, void *data
)
901 char *cmdline
= data
;
903 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
905 if (depth
!= 1 || !cmdline
||
906 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
909 early_init_dt_check_for_initrd(node
);
911 /* Put CONFIG_CMDLINE in if forced or if data had nothing in it to start */
912 if (overwrite_incoming_cmdline
|| !cmdline
[0])
913 strlcpy(cmdline
, config_cmdline
, COMMAND_LINE_SIZE
);
915 /* Retrieve command line unless forcing */
917 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
919 if (p
!= NULL
&& l
> 0) {
920 if (concat_cmdline
) {
923 strlcat(cmdline
, " ", COMMAND_LINE_SIZE
);
924 cmdline_len
= strlen(cmdline
);
925 copy_len
= COMMAND_LINE_SIZE
- cmdline_len
- 1;
926 copy_len
= min((int)l
, copy_len
);
927 strncpy(cmdline
+ cmdline_len
, p
, copy_len
);
928 cmdline
[cmdline_len
+ copy_len
] = '\0';
930 strlcpy(cmdline
, p
, min((int)l
, COMMAND_LINE_SIZE
));
934 pr_debug("Command line is: %s\n", (char*)data
);
940 #ifdef CONFIG_HAVE_MEMBLOCK
942 * called from unflatten_device_tree() to bootstrap devicetree itself
943 * Architectures can override this definition if memblock isn't used
945 void * __init __weak
early_init_dt_alloc_memory_arch(u64 size
, u64 align
)
947 return __va(memblock_alloc(size
, align
));
950 int __init __weak
early_init_dt_reserve_memory_arch(phys_addr_t base
,
951 phys_addr_t size
, bool nomap
)
953 pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n",
954 base
, size
, nomap
? " (nomap)" : "");
960 * unflatten_device_tree - create tree of device_nodes from flat blob
962 * unflattens the device-tree passed by the firmware, creating the
963 * tree of struct device_node. It also fills the "name" and "type"
964 * pointers of the nodes so the normal device-tree walking functions
967 void __init
unflatten_device_tree(void)
969 __unflatten_device_tree(initial_boot_params
, &of_allnodes
,
970 early_init_dt_alloc_memory_arch
);
972 /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
973 of_alias_scan(early_init_dt_alloc_memory_arch
);
976 #endif /* CONFIG_OF_EARLY_FLATTREE */