52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
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/*
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* Copyright (C) 2012 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _ASM_RISCV_PGTABLE_BITS_H
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#define _ASM_RISCV_PGTABLE_BITS_H
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/*
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* PTE format:
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* | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
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* PFN reserved for SW D A G U X W R V
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*/
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#define _PAGE_ACCESSED_OFFSET 6
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#define _PAGE_PRESENT (1 << 0)
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#define _PAGE_READ (1 << 1) /* Readable */
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#define _PAGE_WRITE (1 << 2) /* Writable */
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#define _PAGE_EXEC (1 << 3) /* Executable */
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#define _PAGE_USER (1 << 4) /* User */
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#define _PAGE_GLOBAL (1 << 5) /* Global */
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#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
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#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
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#define _PAGE_SOFT (1 << 8) /* Reserved for software */
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#define _PAGE_SPECIAL _PAGE_SOFT
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#define _PAGE_TABLE _PAGE_PRESENT
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/*
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* _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
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* distinguish them from swapped out pages
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*/
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#define _PAGE_PROT_NONE _PAGE_READ
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#define _PAGE_PFN_SHIFT 10
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/* Set of bits to preserve across pte_modify() */
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#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
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_PAGE_WRITE | _PAGE_EXEC | \
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_PAGE_USER | _PAGE_GLOBAL))
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#endif /* _ASM_RISCV_PGTABLE_BITS_H */
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