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 */ 49