| /* |
| * 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 */ |
| |
| /* We borrow bit 31 to store the exclusive marker in swap PTEs. */ |
| #define _PAGE_SWP_EXCLUSIVE (1<<31) |
| |
| #endif /* _ASM_NIOS2_PGTABLE_BITS_H */ |
