| /* |
| * 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_2LEVEL_HWDEF_H |
| #define __ASM_PGTABLE_2LEVEL_HWDEF_H |
| |
| /* |
| * With LPAE and 64KB pages, there are 2 levels of page tables. Each level has |
| * 8192 entries of 8 bytes each, occupying a 64KB page. Levels 0 and 1 are not |
| * used. The 2nd level table (PGD for Linux) can cover a range of 4TB, each |
| * entry representing 512MB. The user and kernel address spaces are limited to |
| * 512GB and therefore we only use 1024 entries in the PGD. |
| */ |
| #define PTRS_PER_PTE 8192 |
| #define PTRS_PER_PGD 1024 |
| |
| /* |
| * PGDIR_SHIFT determines the size a top-level page table entry can map. |
| */ |
| #define PGDIR_SHIFT 29 |
| #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| |
| /* |
| * section address mask and size definitions. |
| */ |
| #define SECTION_SHIFT 29 |
| #define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT) |
| #define SECTION_MASK (~(SECTION_SIZE-1)) |
| |
| #endif |
