Catalin Marinas | 4f04d8f | 2012-03-05 11:49:27 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 ARM Ltd. |
| 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 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | #ifndef __ASM_PGTABLE_3LEVEL_HWDEF_H |
| 17 | #define __ASM_PGTABLE_3LEVEL_HWDEF_H |
| 18 | |
| 19 | /* |
| 20 | * With LPAE and 4KB pages, there are 3 levels of page tables. Each level has |
| 21 | * 512 entries of 8 bytes each, occupying a 4K page. The first level table |
| 22 | * covers a range of 512GB, each entry representing 1GB. The user and kernel |
| 23 | * address spaces are limited to 512GB each. |
| 24 | */ |
| 25 | #define PTRS_PER_PTE 512 |
| 26 | #define PTRS_PER_PMD 512 |
| 27 | #define PTRS_PER_PGD 512 |
| 28 | |
| 29 | /* |
| 30 | * PGDIR_SHIFT determines the size a top-level page table entry can map. |
| 31 | */ |
| 32 | #define PGDIR_SHIFT 30 |
| 33 | #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT) |
| 34 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| 35 | |
| 36 | /* |
| 37 | * PMD_SHIFT determines the size a middle-level page table entry can map. |
| 38 | */ |
| 39 | #define PMD_SHIFT 21 |
| 40 | #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT) |
| 41 | #define PMD_MASK (~(PMD_SIZE-1)) |
| 42 | |
| 43 | /* |
| 44 | * section address mask and size definitions. |
| 45 | */ |
| 46 | #define SECTION_SHIFT 21 |
| 47 | #define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT) |
| 48 | #define SECTION_MASK (~(SECTION_SIZE-1)) |
| 49 | |
| 50 | #endif |