| Ard Biesheuvel | da58fb6 | 2015-09-24 13:49:52 -0700 | [diff] [blame^] | 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 | } |