| Palmer Dabbelt | 07037db | 2017-07-10 18:06:09 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Regents of the University of California |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation, version 2. |
| 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 | |
| 14 | #ifndef _ASM_RISCV_PGTABLE_BITS_H |
| 15 | #define _ASM_RISCV_PGTABLE_BITS_H |
| 16 | |
| 17 | /* |
| 18 | * PTE format: |
| 19 | * | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 20 | * PFN reserved for SW D A G U X W R V |
| 21 | */ |
| 22 | |
| 23 | #define _PAGE_ACCESSED_OFFSET 6 |
| 24 | |
| 25 | #define _PAGE_PRESENT (1 << 0) |
| 26 | #define _PAGE_READ (1 << 1) /* Readable */ |
| 27 | #define _PAGE_WRITE (1 << 2) /* Writable */ |
| 28 | #define _PAGE_EXEC (1 << 3) /* Executable */ |
| 29 | #define _PAGE_USER (1 << 4) /* User */ |
| 30 | #define _PAGE_GLOBAL (1 << 5) /* Global */ |
| 31 | #define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */ |
| 32 | #define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */ |
| 33 | #define _PAGE_SOFT (1 << 8) /* Reserved for software */ |
| 34 | |
| 35 | #define _PAGE_SPECIAL _PAGE_SOFT |
| 36 | #define _PAGE_TABLE _PAGE_PRESENT |
| 37 | |
| 38 | #define _PAGE_PFN_SHIFT 10 |
| 39 | |
| 40 | /* Set of bits to preserve across pte_modify() */ |
| 41 | #define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \ |
| 42 | _PAGE_WRITE | _PAGE_EXEC | \ |
| 43 | _PAGE_USER | _PAGE_GLOBAL)) |
| 44 | |
| 45 | /* Advertise support for _PAGE_SPECIAL */ |
| 46 | #define __HAVE_ARCH_PTE_SPECIAL |
| 47 | |
| 48 | #endif /* _ASM_RISCV_PGTABLE_BITS_H */ |