1 // SPDX-License-Identifier: GPL-2.0
55  * efi_memmap_alloc - Allocate memory for the EFI memory map
69 	WARN_ON(data->phys_map || data->size);  in efi_memmap_alloc()
71 	data->size = num_entries * efi.memmap.desc_size;  in efi_memmap_alloc()
72 	data->desc_version = efi.memmap.desc_version;  in efi_memmap_alloc()
73 	data->desc_size = efi.memmap.desc_size;  in efi_memmap_alloc()
74 	data->flags &= ~(EFI_MEMMAP_SLAB | EFI_MEMMAP_MEMBLOCK);  in efi_memmap_alloc()
75 	data->flags |= efi.memmap.flags & EFI_MEMMAP_LATE;  in efi_memmap_alloc()
78 		data->flags |= EFI_MEMMAP_SLAB;  in efi_memmap_alloc()
79 		data->phys_map = __efi_memmap_alloc_late(data->size);  in efi_memmap_alloc()
81 		data->flags |= EFI_MEMMAP_MEMBLOCK;  in efi_memmap_alloc()
82 		data->phys_map = __efi_memmap_alloc_early(data->size);  in efi_memmap_alloc()
85 	if (!data->phys_map)  in efi_memmap_alloc()
86 		return -ENOMEM;  in efi_memmap_alloc()
91  * __efi_memmap_init - Common code for mapping the EFI memory map
98  * During bootup EFI_MEMMAP_LATE in data->flags should be clear since we
113 	phys_map = data->phys_map;  in __efi_memmap_init()
115 	if (data->flags & EFI_MEMMAP_LATE)  in __efi_memmap_init()
116 		map.map = memremap(phys_map, data->size, MEMREMAP_WB);  in __efi_memmap_init()
118 		map.map = early_memremap(phys_map, data->size);  in __efi_memmap_init()
122 		return -ENOMEM;  in __efi_memmap_init()
125 	/* NOP if data->flags & (EFI_MEMMAP_MEMBLOCK | EFI_MEMMAP_SLAB) == 0 */  in __efi_memmap_init()
128 	map.phys_map = data->phys_map;  in __efi_memmap_init()
129 	map.nr_map = data->size / data->desc_size;  in __efi_memmap_init()
130 	map.map_end = map.map + data->size;  in __efi_memmap_init()
132 	map.desc_version = data->desc_version;  in __efi_memmap_init()
133 	map.desc_size = data->desc_size;  in __efi_memmap_init()
134 	map.flags = data->flags;  in __efi_memmap_init()
144  * efi_memmap_init_early - Map the EFI memory map data structure
155 	data->flags = 0;  in efi_memmap_init_early()
178  * efi_memmap_init_late - Map efi.memmap with memremap()
217 	 * existing early EFI memmap.  in efi_memmap_init_late()
226  * efi_memmap_install - Install a new EFI memory map in efi.memmap
230  * to switch from early to late mappings. It simply uses the existing
243  * efi_memmap_split_count - Count number of additional EFI memmap entries
256 	start = md->phys_addr;  in efi_memmap_split_count()
257 	end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;  in efi_memmap_split_count()
260 	m_start = range->start;  in efi_memmap_split_count()
261 	m_end = range->end;  in efi_memmap_split_count()
264 		/* split into 2 parts */  in efi_memmap_split_count()
270 		/* split into 3 parts */  in efi_memmap_split_count()
273 		/* split into 2 parts */  in efi_memmap_split_count()
282  * efi_memmap_insert - Insert a memory region in an EFI memmap
283  * @old_memmap: The existing EFI memory map structure
299 	m_start = mem->range.start;  in efi_memmap_insert()
300 	m_end = mem->range.end;  in efi_memmap_insert()
301 	m_attr = mem->attribute;  in efi_memmap_insert()
314 	for (old = old_memmap->map, new = buf;  in efi_memmap_insert()
315 	     old < old_memmap->map_end;  in efi_memmap_insert()
316 	     old += old_memmap->desc_size, new += old_memmap->desc_size) {  in efi_memmap_insert()
319 		memcpy(new, old, old_memmap->desc_size);  in efi_memmap_insert()
321 		start = md->phys_addr;  in efi_memmap_insert()
322 		end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;  in efi_memmap_insert()
325 			md->attribute |= m_attr;  in efi_memmap_insert()
330 			md->attribute |= m_attr;  in efi_memmap_insert()
331 			md->num_pages = (m_end - md->phys_addr + 1) >>  in efi_memmap_insert()
334 			new += old_memmap->desc_size;  in efi_memmap_insert()
335 			memcpy(new, old, old_memmap->desc_size);  in efi_memmap_insert()
337 			md->phys_addr = m_end + 1;  in efi_memmap_insert()
338 			md->num_pages = (end - md->phys_addr + 1) >>  in efi_memmap_insert()
344 			md->num_pages = (m_start - md->phys_addr) >>  in efi_memmap_insert()
347 			new += old_memmap->desc_size;  in efi_memmap_insert()
348 			memcpy(new, old, old_memmap->desc_size);  in efi_memmap_insert()
350 			md->attribute |= m_attr;  in efi_memmap_insert()
351 			md->phys_addr = m_start;  in efi_memmap_insert()
352 			md->num_pages = (m_end - m_start + 1) >>  in efi_memmap_insert()
355 			new += old_memmap->desc_size;  in efi_memmap_insert()
356 			memcpy(new, old, old_memmap->desc_size);  in efi_memmap_insert()
358 			md->phys_addr = m_end + 1;  in efi_memmap_insert()
359 			md->num_pages = (end - m_end) >>  in efi_memmap_insert()
366 			md->num_pages = (m_start - md->phys_addr) >>  in efi_memmap_insert()
369 			new += old_memmap->desc_size;  in efi_memmap_insert()
370 			memcpy(new, old, old_memmap->desc_size);  in efi_memmap_insert()
372 			md->phys_addr = m_start;  in efi_memmap_insert()
373 			md->num_pages = (end - md->phys_addr + 1) >>  in efi_memmap_insert()
375 			md->attribute |= m_attr;  in efi_memmap_insert()