| /* |
| * Copyright (C) 2012 ARM Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| #ifndef __ASM_PGTABLE_3LEVEL_HWDEF_H |
| #define __ASM_PGTABLE_3LEVEL_HWDEF_H |
| |
| /* |
| * With LPAE and 4KB pages, there are 3 levels of page tables. Each level has |
| * 512 entries of 8 bytes each, occupying a 4K page. The first level table |
| * covers a range of 512GB, each entry representing 1GB. The user and kernel |
| * address spaces are limited to 512GB each. |
| */ |
| #define PTRS_PER_PTE 512 |
| #define PTRS_PER_PMD 512 |
| #define PTRS_PER_PGD 512 |
| |
| /* |
| * PGDIR_SHIFT determines the size a top-level page table entry can map. |
| */ |
| #define PGDIR_SHIFT 30 |
| #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| |
| /* |
| * PMD_SHIFT determines the size a middle-level page table entry can map. |
| */ |
| #define PMD_SHIFT 21 |
| #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT) |
| #define PMD_MASK (~(PMD_SIZE-1)) |
| |
| /* |
| * section address mask and size definitions. |
| */ |
| #define SECTION_SHIFT 21 |
| #define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT) |
| #define SECTION_MASK (~(SECTION_SIZE-1)) |
| |
| #endif |
