diff options
Diffstat (limited to 'arch/riscv/include/asm/pgtable-bits.h')
| -rw-r--r-- | arch/riscv/include/asm/pgtable-bits.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h new file mode 100644 index 000000000..470755cb7 --- /dev/null +++ b/arch/riscv/include/asm/pgtable-bits.h @@ -0,0 +1,51 @@ +/* + * 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 */ |