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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2012 Regents of the University of California */ #ifndef _ASM_RISCV_PGTABLE_BITS_H #define _ASM_RISCV_PGTABLE_BITS_H /* * PTE format: * | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 * PFN reserved for SW D A G U X W R V */ #define _PAGE_ACCESSED_OFFSET 6 #define _PAGE_PRESENT (1 << 0) #define _PAGE_READ (1 << 1) /* Readable */ #define _PAGE_WRITE (1 << 2) /* Writable */ #define _PAGE_EXEC (1 << 3) /* Executable */ #define _PAGE_USER (1 << 4) /* User */ #define _PAGE_GLOBAL (1 << 5) /* Global */ #define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */ #define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */ #define _PAGE_SOFT (1 << 8) /* Reserved for software */ #define _PAGE_SPECIAL _PAGE_SOFT #define _PAGE_TABLE _PAGE_PRESENT /* * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to * distinguish them from swapped out pages */ #define _PAGE_PROT_NONE _PAGE_READ #define _PAGE_PFN_SHIFT 10 /* Set of bits to preserve across pte_modify() */ #define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \ _PAGE_WRITE | _PAGE_EXEC | \ _PAGE_USER | _PAGE_GLOBAL)) /* * when all of R/W/X are zero, the PTE is a pointer to the next level * of the page table; otherwise, it is a leaf PTE. */ #define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) #endif /* _ASM_RISCV_PGTABLE_BITS_H */