1 /* 2 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #include <linux/efi.h> 10 #include <asm/efi.h> 11 #include <asm/mach/map.h> 12 #include <asm/mmu_context.h> 13 14 int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md) 15 { 16 struct map_desc desc = { 17 .virtual = md->virt_addr, 18 .pfn = __phys_to_pfn(md->phys_addr), 19 .length = md->num_pages * EFI_PAGE_SIZE, 20 }; 21 22 /* 23 * Order is important here: memory regions may have all of the 24 * bits below set (and usually do), so we check them in order of 25 * preference. 26 */ 27 if (md->attribute & EFI_MEMORY_WB) 28 desc.type = MT_MEMORY_RWX; 29 else if (md->attribute & EFI_MEMORY_WT) 30 desc.type = MT_MEMORY_RWX_NONCACHED; 31 else if (md->attribute & EFI_MEMORY_WC) 32 desc.type = MT_DEVICE_WC; 33 else 34 desc.type = MT_DEVICE; 35 36 create_mapping_late(mm, &desc, true); 37 return 0; 38 } 39