Ley Foon Tan | cbd15b3 | 2014-11-06 15:19:45 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> |
| 3 | * Copyright (C) 2009 Wind River Systems Inc |
| 4 | * |
| 5 | * This file is subject to the terms and conditions of the GNU General Public |
| 6 | * License. See the file "COPYING" in the main directory of this archive |
| 7 | * for more details. |
| 8 | */ |
| 9 | |
| 10 | #ifndef _ASM_NIOS2_PGTABLE_BITS_H |
| 11 | #define _ASM_NIOS2_PGTABLE_BITS_H |
| 12 | |
| 13 | /* |
| 14 | * These are actual hardware defined protection bits in the tlbacc register |
| 15 | * which looks like this: |
| 16 | * |
| 17 | * 31 30 ... 26 25 24 23 22 21 20 19 18 ... 1 0 |
| 18 | * ignored........ C R W X G PFN............ |
| 19 | */ |
| 20 | #define _PAGE_GLOBAL (1<<20) |
| 21 | #define _PAGE_EXEC (1<<21) |
| 22 | #define _PAGE_WRITE (1<<22) |
| 23 | #define _PAGE_READ (1<<23) |
| 24 | #define _PAGE_CACHED (1<<24) /* C: data access cacheable */ |
| 25 | |
| 26 | /* |
| 27 | * Software defined bits. They are ignored by the hardware and always read back |
| 28 | * as zero, but can be written as non-zero. |
| 29 | */ |
| 30 | #define _PAGE_PRESENT (1<<25) /* PTE contains a translation */ |
| 31 | #define _PAGE_ACCESSED (1<<26) /* page referenced */ |
| 32 | #define _PAGE_DIRTY (1<<27) /* dirty page */ |
Ley Foon Tan | cbd15b3 | 2014-11-06 15:19:45 +0800 | [diff] [blame] | 33 | |
| 34 | #endif /* _ASM_NIOS2_PGTABLE_BITS_H */ |