| 1 | |
| 2 | * Copyright (C) 2011 Tobias Klauser <[email protected]>
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| 3 | * Copyright (C) 2009 Wind River Systems Inc
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| 4 | *
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| 5 | * This file is subject to the terms and conditions of the GNU General Public
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| 6 | * License. See the file "COPYING" in the main directory of this archive
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| 7 | * for more details.
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| 8 |
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| 9 |
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| 10 | #ifndef _ASM_NIOS2_PGTABLE_BITS_H
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| 11 | #define _ASM_NIOS2_PGTABLE_BITS_H
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| 12 |
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| 13 | |
| 14 | * These are actual hardware defined protection bits in the tlbacc register
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| 15 | * which looks like this:
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| 16 | *
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| 17 | * 31 30 ... 26 25 24 23 22 21 20 19 18 ... 1 0
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| 18 | * ignored........ C R W X G PFN............
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| 19 |
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| 20 | #define _PAGE_GLOBAL (1<<20)
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| 21 | #define _PAGE_EXEC (1<<21)
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| 22 | #define _PAGE_WRITE (1<<22)
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| 23 | #define _PAGE_READ (1<<23)
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| 24 | #define _PAGE_CACHED (1<<24)
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| 25 |
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| 26 | |
| 27 | * Software defined bits. They are ignored by the hardware and always read back
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| 28 | * as zero, but can be written as non-zero.
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| 29 |
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| 30 | #define _PAGE_PRESENT (1<<25)
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| 31 | #define _PAGE_ACCESSED (1<<26)
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| 32 | #define _PAGE_DIRTY (1<<27)
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| 33 |
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| 34 |
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| 35 | #define _PAGE_SWP_EXCLUSIVE (1<<31)
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| 36 |
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| 37 | #endif
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