39  * Memblock is a method of managing memory regions during the early
44  * regions. There are several types of these collections:
50  * * ``reserved`` - describes the regions that were allocated
58  * which contains an array of memory regions along with
66  * arrays during addition of new regions. This feature should be used
116 	.memory.regions		= memblock_memory_init_regions,
121 	.reserved.regions	= memblock_reserved_init_regions,
132 	.regions		= memblock_physmem_init_regions,
148 	for (i = 0, rgn = &memblock_type->regions[0];			\
150 	     i++, rgn = &memblock_type->regions[i])
198 		if (memblock_addrs_overlap(base, size, type->regions[i].base,  in memblock_overlaps_region()
199 					   type->regions[i].size))  in memblock_overlaps_region()
351 	type->total_size -= type->regions[r].size;  in memblock_remove_region()
352 	memmove(&type->regions[r], &type->regions[r + 1],  in memblock_remove_region()
353 		(type->cnt - (r + 1)) * sizeof(type->regions[r]));  in memblock_remove_region()
360 		type->regions[0].base = 0;  in memblock_remove_region()
361 		type->regions[0].size = 0;  in memblock_remove_region()
362 		type->regions[0].flags = 0;  in memblock_remove_region()
363 		memblock_set_region_node(&type->regions[0], MAX_NUMNODES);  in memblock_remove_region()
375 	if (memblock.reserved.regions != memblock_reserved_init_regions) {  in memblock_discard()
376 		addr = __pa(memblock.reserved.regions);  in memblock_discard()
380 			kfree(memblock.reserved.regions);  in memblock_discard()
385 	if (memblock.memory.regions != memblock_memory_init_regions) {  in memblock_discard()
386 		addr = __pa(memblock.memory.regions);  in memblock_discard()
390 			kfree(memblock.memory.regions);  in memblock_discard()
400  * memblock_double_array - double the size of the memblock regions array
401  * @type: memblock type of the regions array being doubled
405  * Double the size of the @type regions array. If memblock is being used to
406  * allocate memory for a new reserved regions array and there is a previously
424 	/* We don't allow resizing until we know about the reserved regions  in memblock_double_array()
451 		/* only exclude range when trying to double reserved.regions */  in memblock_double_array()
480 	memcpy(new_array, type->regions, old_size);  in memblock_double_array()
482 	old_array = type->regions;  in memblock_double_array()
483 	type->regions = new_array;  in memblock_double_array()
507  * memblock_merge_regions - merge neighboring compatible regions
511  * Scan @type and merge neighboring compatible regions in [@start_rgn - 1, @end_rgn)
522 		struct memblock_region *this = &type->regions[i];  in memblock_merge_regions()
523 		struct memblock_region *next = &type->regions[i + 1];  in memblock_merge_regions()
560 	struct memblock_region *rgn = &type->regions[idx];  in memblock_insert_region()
582  * existing regions.  @type is guaranteed to be minimal (all neighbouring
583  * compatible regions are merged) after the addition.
602 	if (type->regions[0].size == 0) {  in memblock_add_range()
604 		type->regions[0].base = base;  in memblock_add_range()
605 		type->regions[0].size = size;  in memblock_add_range()
606 		type->regions[0].flags = flags;  in memblock_add_range()
607 		memblock_set_region_node(&type->regions[0], nid);  in memblock_add_range()
613 	 * The worst case is when new range overlaps all existing regions,  in memblock_add_range()
614 	 * then we'll need type->cnt + 1 empty regions in @type. So if  in memblock_add_range()
616 	 * that there is enough empty regions in @type, and we can insert  in memblock_add_range()
617 	 * regions directly.  in memblock_add_range()
625 	 * then with %true.  The first counts the number of regions needed  in memblock_add_range()
780  * Walk @type and ensure that regions don't cross the boundaries defined by
781  * [@base, @base + @size).  Crossing regions are split at the boundaries,
782  * which may create at most two more regions.  The index of the first
801 	/* we'll create at most two more regions */  in memblock_isolate_range()
950 		struct memblock_region *r = &type->regions[i];  in memblock_setclr_flag()
1008  * The memory regions marked with %MEMBLOCK_NOMAP will not be added to the
1009  * direct mapping of the physical memory. These regions will still be
1041 	/* we never skip regions when iterating memblock.reserved or physmem */  in should_skip_region()
1045 	/* only memory regions are associated with nodes, check it */  in should_skip_region()
1049 	/* skip hotpluggable memory regions if needed */  in should_skip_region()
1054 	/* if we want mirror memory skip non-mirror memory regions */  in should_skip_region()
1083  * areas before each region in type_b.	For example, if type_b regions
1088  * The upper 32bit indexes the following regions.
1104 		struct memblock_region *m = &type_a->regions[idx_a];  in __next_mem_range()
1131 			r = &type_b->regions[idx_b];  in __next_mem_range()
1142 			/* if the two regions intersect, we're done */  in __next_mem_range()
1205 		struct memblock_region *m = &type_a->regions[idx_a];  in __next_mem_range_rev()
1232 			r = &type_b->regions[idx_b];  in __next_mem_range_rev()
1243 			/* if the two regions intersect, we're done */  in __next_mem_range_rev()
1276 		r = &type->regions[*idx];  in __next_mem_pfn_range()
1298  * memblock_set_node - set node ID on memblock regions
1304  * Set the nid of memblock @type regions in [@base, @base + @size) to @nid.
1305  * Regions which cross the area boundaries are split as necessary.
1322 		memblock_set_region_node(&type->regions[i], nid);  in memblock_set_node()
1409  * from the regions with mirroring enabled and then retried from any
1717 	return memblock.memory.regions[0].base;  in memblock_start_of_DRAM()
1724 	return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);  in memblock_end_of_DRAM()
1734 	 * the memory memblock regions, if the @limit exceeds the total size  in __find_max_addr()
1735 	 * of those regions, max_addr will keep original value PHYS_ADDR_MAX  in __find_max_addr()
1761 	/* truncate both memory and reserved regions */  in memblock_enforce_memory_limit()
1786 	/* remove all the MAP regions */  in memblock_cap_memory_range()
1788 		if (!memblock_is_nomap(&memblock.memory.regions[i]))  in memblock_cap_memory_range()
1792 		if (!memblock_is_nomap(&memblock.memory.regions[i]))  in memblock_cap_memory_range()
1795 	/* truncate the reserved regions */  in memblock_cap_memory_range()
1824 		if (addr < type->regions[mid].base)  in memblock_search()
1826 		else if (addr >= (type->regions[mid].base +  in memblock_search()
1827 				  type->regions[mid].size))  in memblock_search()
1851 	return !memblock_is_nomap(&memblock.memory.regions[i]);  in memblock_is_map_memory()
1863 	*start_pfn = PFN_DOWN(type->regions[mid].base);  in memblock_search_pfn_nid()
1864 	*end_pfn = PFN_DOWN(type->regions[mid].base + type->regions[mid].size);  in memblock_search_pfn_nid()
1866 	return memblock_get_region_node(&type->regions[mid]);  in memblock_search_pfn_nid()
1886 	return (memblock.memory.regions[idx].base +  in memblock_is_region_memory()
1887 		 memblock.memory.regions[idx].size) >= end;  in memblock_is_region_memory()
1925 					       r - memblock.memory.regions);  in memblock_trim_memory()
2128 	 * pages for the NOMAP regions as PageReserved  in memmap_init_reserved_pages()
2141 	/* initialize struct pages for the reserved regions */  in memmap_init_reserved_pages()
2230 		reg = &type->regions[i];  in memblock_debug_show()