tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_2LEVEL_HWDEF_H
17#define __ASM_PGTABLE_2LEVEL_HWDEF_H
18
19/*
20 * With LPAE and 64KB pages, there are 2 levels of page tables. Each level has
21 * 8192 entries of 8 bytes each, occupying a 64KB page. Levels 0 and 1 are not
22 * used. The 2nd level table (PGD for Linux) can cover a range of 4TB, each
23 * entry representing 512MB. The user and kernel address spaces are limited to
24 * 512GB and therefore we only use 1024 entries in the PGD.
25 */
26#define PTRS_PER_PTE 8192
27#define PTRS_PER_PGD 1024
28
29/*
30 * PGDIR_SHIFT determines the size a top-level page table entry can map.
31 */
32#define PGDIR_SHIFT 29
33#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
34#define PGDIR_MASK (~(PGDIR_SIZE-1))
35
36/*
37 * section address mask and size definitions.
38 */
39#define SECTION_SHIFT 29
40#define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT)
41#define SECTION_MASK (~(SECTION_SIZE-1))
42
43#endif