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