38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
/*
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* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
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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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/* We borrow bit 31 to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE (1<<31)
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#endif /* _ASM_NIOS2_PGTABLE_BITS_H */
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