2 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
16 #ifndef __ASM_PGTABLE_3LEVEL_HWDEF_H
17 #define __ASM_PGTABLE_3LEVEL_HWDEF_H
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.
25 #define PTRS_PER_PTE 512
26 #define PTRS_PER_PMD 512
27 #define PTRS_PER_PGD 512
30 * PGDIR_SHIFT determines the size a top-level page table entry can map.
32 #define PGDIR_SHIFT 30
33 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
34 #define PGDIR_MASK (~(PGDIR_SIZE-1))
37 * PMD_SHIFT determines the size a middle-level page table entry can map.
40 #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
41 #define PMD_MASK (~(PMD_SIZE-1))
44 * section address mask and size definitions.
46 #define SECTION_SHIFT 21
47 #define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT)
48 #define SECTION_MASK (~(SECTION_SIZE-1))