pgtable-bits.h (1205B)
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#define _PAGE_ACCESSED_OFFSET 6 10 11#define _PAGE_PRESENT (1 << 0) 12#define _PAGE_READ (1 << 1) /* Readable */ 13#define _PAGE_WRITE (1 << 2) /* Writable */ 14#define _PAGE_EXEC (1 << 3) /* Executable */ 15#define _PAGE_USER (1 << 4) /* User */ 16#define _PAGE_GLOBAL (1 << 5) /* Global */ 17#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */ 18#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */ 19#define _PAGE_SOFT (1 << 8) /* Reserved for software */ 20 21#define _PAGE_SPECIAL _PAGE_SOFT 22#define _PAGE_TABLE _PAGE_PRESENT 23 24/* 25 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to 26 * distinguish them from swapped out pages 27 */ 28#define _PAGE_PROT_NONE _PAGE_GLOBAL 29 30#define _PAGE_PFN_SHIFT 10 31 32/* 33 * when all of R/W/X are zero, the PTE is a pointer to the next level 34 * of the page table; otherwise, it is a leaf PTE. 35 */ 36#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) 37 38#endif /* _ASM_RISCV_PGTABLE_BITS_H */