1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2012 Regents of the University of California 4 */ 5 6#ifndef _ASM_RISCV_PGTABLE_BITS_H 7#define _ASM_RISCV_PGTABLE_BITS_H 8 9/* 10 * PTE format: 11 * | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 12 * PFN reserved for SW D A G U X W R V 13 */ 14 15#define _PAGE_ACCESSED_OFFSET 6 16 17#define _PAGE_PRESENT (1 << 0) 18#define _PAGE_READ (1 << 1) /* Readable */ 19#define _PAGE_WRITE (1 << 2) /* Writable */ 20#define _PAGE_EXEC (1 << 3) /* Executable */ 21#define _PAGE_USER (1 << 4) /* User */ 22#define _PAGE_GLOBAL (1 << 5) /* Global */ 23#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */ 24#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */ 25#define _PAGE_SOFT (1 << 8) /* Reserved for software */ 26 27#define _PAGE_SPECIAL _PAGE_SOFT 28#define _PAGE_TABLE _PAGE_PRESENT 29 30/* 31 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to 32 * distinguish them from swapped out pages 33 */ 34#define _PAGE_PROT_NONE _PAGE_READ 35 36#define _PAGE_PFN_SHIFT 10 37 38/* Set of bits to preserve across pte_modify() */ 39#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \ 40 _PAGE_WRITE | _PAGE_EXEC | \ 41 _PAGE_USER | _PAGE_GLOBAL)) 42/* 43 * when all of R/W/X are zero, the PTE is a pointer to the next level 44 * of the page table; otherwise, it is a leaf PTE. 45 */ 46#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) 47 48#endif /* _ASM_RISCV_PGTABLE_BITS_H */ 49