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 (3 << 8) /* Reserved for software */ 20 21 #define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */ 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 /* Used for swap PTEs only. */ 31 #define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED 32 33 #define _PAGE_PFN_SHIFT 10 34 35 /* 36 * when all of R/W/X are zero, the PTE is a pointer to the next level 37 * of the page table; otherwise, it is a leaf PTE. 38 */ 39 #define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) 40 41 #endif /* _ASM_RISCV_PGTABLE_BITS_H */ 42