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 /* 39 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to 40 * distinguish them from swapped out pages 41 */ 42 #define _PAGE_PROT_NONE _PAGE_READ 43 44 #define _PAGE_PFN_SHIFT 10 45 46 /* Set of bits to preserve across pte_modify() */ 47 #define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \ 48 _PAGE_WRITE | _PAGE_EXEC | \ 49 _PAGE_USER | _PAGE_GLOBAL)) 50 51 #endif /* _ASM_RISCV_PGTABLE_BITS_H */ 52