1 // SPDX-License-Identifier: GPL-2.0
43  * of_fdt_limit_memory - limit the number of regions in the /memory node
82 static void *unflatten_dt_alloc(void **mem, unsigned long size,  in unflatten_dt_alloc()  argument
87 	*mem = PTR_ALIGN(*mem, align);  in unflatten_dt_alloc()
88 	res = *mem;  in unflatten_dt_alloc()
89 	*mem += size;  in unflatten_dt_alloc()
96 				void **mem,  in populate_properties()  argument
105 	pprev = &np->properties;  in populate_properties()
127 		pp = unflatten_dt_alloc(mem, sizeof(struct property),  in populate_properties()
133 		 * ePAPR-style "phandle" properties, or the  in populate_properties()
140 			if (!np->phandle)  in populate_properties()
141 				np->phandle = be32_to_cpup(val);  in populate_properties()
149 			np->phandle = be32_to_cpup(val);  in populate_properties()
151 		pp->name   = (char *)pname;  in populate_properties()
152 		pp->length = sz;  in populate_properties()
153 		pp->value  = (__be32 *)val;  in populate_properties()
155 		pprev      = &pp->next;  in populate_properties()
175 		len = (pa - ps) + 1;  in populate_properties()
176 		pp = unflatten_dt_alloc(mem, sizeof(struct property) + len,  in populate_properties()
179 			pp->name   = "name";  in populate_properties()
180 			pp->length = len;  in populate_properties()
181 			pp->value  = pp + 1;  in populate_properties()
183 			memcpy(pp->value, ps, len - 1);  in populate_properties()
184 			((char *)pp->value)[len - 1] = 0;  in populate_properties()
185 			pr_debug("fixed up name for %s -> %s\n",  in populate_properties()
186 				 nodename, (char *)pp->value);  in populate_properties()
193 			  void **mem,  in populate_node()  argument
210 	np = unflatten_dt_alloc(mem, sizeof(struct device_node) + len,  in populate_node()
215 		np->full_name = fn = ((char *)np) + sizeof(*np);  in populate_node()
220 			np->parent = dad;  in populate_node()
221 			np->sibling = dad->child;  in populate_node()
222 			dad->child = np;  in populate_node()
226 	populate_properties(blob, offset, mem, np, pathp, dryrun);  in populate_node()
228 		np->name = of_get_property(np, "name", NULL);  in populate_node()
229 		if (!np->name)  in populate_node()
230 			np->name = "<NULL>";  in populate_node()
241 	/* In-depth first */  in reverse_nodes()
242 	child = parent->child;  in reverse_nodes()
246 		child = child->sibling;  in reverse_nodes()
250 	child = parent->child;  in reverse_nodes()
251 	parent->child = NULL;  in reverse_nodes()
253 		next = child->sibling;  in reverse_nodes()
255 		child->sibling = parent->child;  in reverse_nodes()
256 		parent->child = child;  in reverse_nodes()
262  * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree
264  * @mem: Memory chunk to use for allocating device nodes and properties
271 			      void *mem,  in unflatten_dt_nodes()  argument
279 	void *base = mem;  in unflatten_dt_nodes()  local
280 	bool dryrun = !base;  in unflatten_dt_nodes()
287 	 * We're unflattening device sub-tree if @dad is valid. There are  in unflatten_dt_nodes()
302 		if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH - 1))  in unflatten_dt_nodes()
309 		ret = populate_node(blob, offset, &mem, nps[depth],  in unflatten_dt_nodes()
320 	if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {  in unflatten_dt_nodes()
322 		return -EINVAL;  in unflatten_dt_nodes()
332 	return mem - base;  in unflatten_dt_nodes()
336  * __unflatten_device_tree - create tree of device_nodes from flat blob
344  * unflattens a device-tree, creating the tree of struct device_node. It also
345  * fills the "name" and "type" pointers of the nodes so the normal device-tree
358 	void *mem;  in __unflatten_device_tree()  local
364 	pr_debug(" -> unflatten_device_tree()\n");  in __unflatten_device_tree()
390 	mem = dt_alloc(size + 4, __alignof__(struct device_node));  in __unflatten_device_tree()
391 	if (!mem)  in __unflatten_device_tree()
394 	memset(mem, 0, size);  in __unflatten_device_tree()
396 	*(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);  in __unflatten_device_tree()
398 	pr_debug("  unflattening %p...\n", mem);  in __unflatten_device_tree()
401 	ret = unflatten_dt_nodes(blob, mem, dad, mynodes);  in __unflatten_device_tree()
403 	if (be32_to_cpup(mem + size) != 0xdeadbeef)  in __unflatten_device_tree()
405 			be32_to_cpup(mem + size));  in __unflatten_device_tree()
415 	pr_debug(" <- unflatten_device_tree()\n");  in __unflatten_device_tree()
416 	return mem;  in __unflatten_device_tree()
427  * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
432  * unflattens the device-tree passed by the firmware, creating the
434  * pointers of the nodes so the normal device-tree walking functions
444 	void *mem;  in of_fdt_unflatten_tree()  local
447 	mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc,  in of_fdt_unflatten_tree()
451 	return mem;  in of_fdt_unflatten_tree()
466  * fdt_reserve_elfcorehdr() - reserves memory for elf core header
490  * early_init_fdt_scan_reserved_mem() - create reserved memory regions
499 	u64 base, size;  in early_init_fdt_scan_reserved_mem()  local
509 		fdt_get_mem_rsv(initial_boot_params, n, &base, &size);  in early_init_fdt_scan_reserved_mem()
512 		memblock_reserve(base, size);  in early_init_fdt_scan_reserved_mem()
519  * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob
532  * of_scan_flat_dt - scan flattened tree blob and call callback on each.
536  * This function is used to scan the flattened device-tree, it is
547 	int offset, rc = 0, depth = -1;  in of_scan_flat_dt()
552 	for (offset = fdt_next_node(blob, -1, &depth);  in of_scan_flat_dt()
563  * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each.
568  * This function is used to scan sub-nodes of a node.
592  * of_get_flat_dt_subnode_by_name - get the subnode by given name
596  * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
605  * of_get_flat_dt_root - find the root node in the flat blob
613  * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
625  * of_fdt_is_compatible - Return true if given node from the given blob has
631  * Return: a non-zero value on match with smaller values returned for more
650 		cplen -= l;  in of_fdt_is_compatible()
657  * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
667  * of_flat_dt_match - Return true if node matches a list of compatible values
687  * of_get_flat_dt_phandle - Given a node in the flat blob, return the phandle
706  * of_flat_dt_match_machine - Iterate match tables to find matching machine.
741 				size -= strlen(prop) + 1;  in of_flat_dt_match_machine()
771  * early_init_dt_check_for_initrd - Decode initrd location from flat tree
785 	prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);  in early_init_dt_check_for_initrd()
790 	prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);  in early_init_dt_check_for_initrd()
799 	phys_initrd_size = end - start;  in early_init_dt_check_for_initrd()
805  * early_init_dt_check_for_elfcorehdr - Decode elfcorehdr location from flat
830 static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND;
833  * The main usage of linux,usable-memory-range is for crash dump kernel.
834  * Originally, the number of usable-memory regions is one. Now there may
836  * To make compatibility with existing user-space and older kdump, the low
837  * region is always the last range of linux,usable-memory-range if exist.
842  * early_init_dt_check_for_usable_mem_range - Decode usable memory range
855 	pr_debug("Looking for usable-memory-range property... ");  in early_init_dt_check_for_usable_mem_range()
857 	prop = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);  in early_init_dt_check_for_usable_mem_range()
863 		rgn[i].base = dt_mem_next_cell(dt_root_addr_cells, &prop);  in early_init_dt_check_for_usable_mem_range()
866 		pr_debug("cap_mem_regions[%d]: base=%pa, size=%pa\n",  in early_init_dt_check_for_usable_mem_range()
867 			 i, &rgn[i].base, &rgn[i].size);  in early_init_dt_check_for_usable_mem_range()
870 	memblock_cap_memory_range(rgn[0].base, rgn[0].size);  in early_init_dt_check_for_usable_mem_range()
872 		memblock_add(rgn[i].base, rgn[i].size);  in early_init_dt_check_for_usable_mem_range()
890 		return -ENOENT;  in early_init_dt_scan_chosen_stdout()
892 	p = fdt_getprop(fdt, offset, "stdout-path", &l);  in early_init_dt_scan_chosen_stdout()
894 		p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);  in early_init_dt_scan_chosen_stdout()
896 		return -ENOENT;  in early_init_dt_scan_chosen_stdout()
901 	l = q - p;  in early_init_dt_scan_chosen_stdout()
903 	/* Get the node specified by stdout-path */  in early_init_dt_scan_chosen_stdout()
906 		pr_warn("earlycon: stdout-path %.*s not found\n", l, p);  in early_init_dt_scan_chosen_stdout()
911 		if (!match->compatible[0])  in early_init_dt_scan_chosen_stdout()
914 		if (fdt_node_check_compatible(fdt, offset, match->compatible))  in early_init_dt_scan_chosen_stdout()
918 		if (!ret || ret == -EALREADY)  in early_init_dt_scan_chosen_stdout()
921 	return -ENODEV;  in early_init_dt_scan_chosen_stdout()
926  * early_init_dt_scan_root - fetch the top level address and size cells
935 		return -ENODEV;  in early_init_dt_scan_root()
940 	prop = of_get_flat_dt_prop(node, "#size-cells", NULL);  in early_init_dt_scan_root()
945 	prop = of_get_flat_dt_prop(node, "#address-cells", NULL);  in early_init_dt_scan_root()
962  * early_init_dt_scan_memory - Look for and parse memory nodes
982 		reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);  in early_init_dt_scan_memory()
994 		while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {  in early_init_dt_scan_memory()
995 			u64 base, size;  in early_init_dt_scan_memory()  local
997 			base = dt_mem_next_cell(dt_root_addr_cells, &reg);  in early_init_dt_scan_memory()
1002 			pr_debug(" - %llx, %llx\n", base, size);  in early_init_dt_scan_memory()
1004 			early_init_dt_add_memory_arch(base, size);  in early_init_dt_scan_memory()
1011 			if (memblock_mark_hotplug(base, size))  in early_init_dt_scan_memory()
1012 				pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n",  in early_init_dt_scan_memory()
1013 					base, base + size);  in early_init_dt_scan_memory()
1038 	rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l);  in early_init_dt_scan_chosen()
1043 		fdt_nop_property(initial_boot_params, node, "rng-seed");  in early_init_dt_scan_chosen()
1086 void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)  in early_init_dt_add_memory_arch()  argument
1090 	if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {  in early_init_dt_add_memory_arch()
1091 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1092 			base, base + size);  in early_init_dt_add_memory_arch()
1096 	if (!PAGE_ALIGNED(base)) {  in early_init_dt_add_memory_arch()
1097 		size -= PAGE_SIZE - (base & ~PAGE_MASK);  in early_init_dt_add_memory_arch()
1098 		base = PAGE_ALIGN(base);  in early_init_dt_add_memory_arch()
1102 	if (base > MAX_MEMBLOCK_ADDR) {  in early_init_dt_add_memory_arch()
1103 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1104 			base, base + size);  in early_init_dt_add_memory_arch()
1108 	if (base + size - 1 > MAX_MEMBLOCK_ADDR) {  in early_init_dt_add_memory_arch()
1109 		pr_warn("Ignoring memory range 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1110 			((u64)MAX_MEMBLOCK_ADDR) + 1, base + size);  in early_init_dt_add_memory_arch()
1111 		size = MAX_MEMBLOCK_ADDR - base + 1;  in early_init_dt_add_memory_arch()
1114 	if (base + size < phys_offset) {  in early_init_dt_add_memory_arch()
1115 		pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1116 			base, base + size);  in early_init_dt_add_memory_arch()
1119 	if (base < phys_offset) {  in early_init_dt_add_memory_arch()
1120 		pr_warn("Ignoring memory range 0x%llx - 0x%llx\n",  in early_init_dt_add_memory_arch()
1121 			base, phys_offset);  in early_init_dt_add_memory_arch()
1122 		size -= phys_offset - base;  in early_init_dt_add_memory_arch()
1123 		base = phys_offset;  in early_init_dt_add_memory_arch()
1125 	memblock_add(base, size);  in early_init_dt_add_memory_arch()
1148 	/* Setup flat device-tree pointer */  in early_init_dt_verify()
1153 	/* Initialize {size,address}-cells info */  in early_init_dt_verify()
1172 	/* Handle linux,usable-memory-range property */  in early_init_dt_scan_nodes()
1204  * unflatten_device_tree - create tree of device_nodes from flat blob
1206  * unflattens the device-tree passed by the firmware, creating the
1208  * pointers of the nodes so the normal device-tree walking functions
1227 		    __dtb_empty_root_end - __dtb_empty_root_begin) {  in unflatten_device_tree()
1245  * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
1247  * Copies and unflattens the device-tree passed by the firmware, creating the
1249  * pointers of the nodes so the normal device-tree walking functions
1251  * reserved such is the case when the FDT is built-in to the kernel init