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- /*
- * 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
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