arch/arm64/include/asm/pgtable-3level-hwdef.h

   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