| /* | |
| * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> | |
| * Copyright (C) 2009 Wind River Systems Inc | |
| * | |
| * This file is subject to the terms and conditions of the GNU General Public | |
| * License. See the file "COPYING" in the main directory of this archive | |
| * for more details. | |
| */ | |
| #ifndef _ASM_NIOS2_PGTABLE_BITS_H | |
| #define _ASM_NIOS2_PGTABLE_BITS_H | |
| /* | |
| * These are actual hardware defined protection bits in the tlbacc register | |
| * which looks like this: | |
| * | |
| * 31 30 ... 26 25 24 23 22 21 20 19 18 ... 1 0 | |
| * ignored........ C R W X G PFN............ | |
| */ | |
| #define _PAGE_GLOBAL (1<<20) | |
| #define _PAGE_EXEC (1<<21) | |
| #define _PAGE_WRITE (1<<22) | |
| #define _PAGE_READ (1<<23) | |
| #define _PAGE_CACHED (1<<24) /* C: data access cacheable */ | |
| /* | |
| * Software defined bits. They are ignored by the hardware and always read back | |
| * as zero, but can be written as non-zero. | |
| */ | |
| #define _PAGE_PRESENT (1<<25) /* PTE contains a translation */ | |
| #define _PAGE_ACCESSED (1<<26) /* page referenced */ | |
| #define _PAGE_DIRTY (1<<27) /* dirty page */ | |
| #endif /* _ASM_NIOS2_PGTABLE_BITS_H */ |