| /* |
| * Copyright (C) 2012 Regents of the University of California |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation, version 2. |
| * |
| * 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. |
| */ |
| |
| #ifndef _ASM_RISCV_PGTABLE_BITS_H |
| #define _ASM_RISCV_PGTABLE_BITS_H |
| |
| /* |
| * PTE format: |
| * | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| * PFN reserved for SW D A G U X W R V |
| */ |
| |
| #define _PAGE_ACCESSED_OFFSET 6 |
| |
| #define _PAGE_PRESENT (1 << 0) |
| #define _PAGE_READ (1 << 1) /* Readable */ |
| #define _PAGE_WRITE (1 << 2) /* Writable */ |
| #define _PAGE_EXEC (1 << 3) /* Executable */ |
| #define _PAGE_USER (1 << 4) /* User */ |
| #define _PAGE_GLOBAL (1 << 5) /* Global */ |
| #define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */ |
| #define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */ |
| #define _PAGE_SOFT (1 << 8) /* Reserved for software */ |
| |
| #define _PAGE_SPECIAL _PAGE_SOFT |
| #define _PAGE_TABLE _PAGE_PRESENT |
| |
| /* |
| * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to |
| * distinguish them from swapped out pages |
| */ |
| #define _PAGE_PROT_NONE _PAGE_READ |
| |
| #define _PAGE_PFN_SHIFT 10 |
| |
| /* Set of bits to preserve across pte_modify() */ |
| #define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \ |
| _PAGE_WRITE | _PAGE_EXEC | \ |
| _PAGE_USER | _PAGE_GLOBAL)) |
| |
| #endif /* _ASM_RISCV_PGTABLE_BITS_H */ |
