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- /*
- * Copyright (C) 2012 Regents of the University of California
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #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))
- #endif /* _ASM_RISCV_PGTABLE_BITS_H */
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