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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/csky/abiv2/inc/abi/pgtable-bits.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_CSKY_PGTABLE_BITS_H

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#define __ASM_CSKY_PGTABLE_BITS_H

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/* implemented in software */

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#define _PAGE_ACCESSED		(1<<7)

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#define _PAGE_READ		(1<<8)

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#define _PAGE_WRITE		(1<<9)

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#define _PAGE_PRESENT		(1<<10)

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#define _PAGE_MODIFIED		(1<<11)

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/* We borrow bit 7 to store the exclusive marker in swap PTEs. */

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#define _PAGE_SWP_EXCLUSIVE	(1<<7)

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/* implemented in hardware */

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#define _PAGE_GLOBAL		(1<<0)

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#define _PAGE_VALID		(1<<1)

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#define _PAGE_DIRTY		(1<<2)

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#define _PAGE_SO		(1<<5)

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#define _PAGE_BUF		(1<<6)

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#define _PAGE_CACHE		(1<<3)

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#define _CACHE_MASK		_PAGE_CACHE

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#define _CACHE_CACHED		(_PAGE_CACHE | _PAGE_BUF)

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#define _CACHE_UNCACHED		(0)

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#define _PAGE_PROT_NONE		_PAGE_WRITE

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/*

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 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that

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 * are !pte_none() && !pte_present().

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 *

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 * Format of swap PTE:

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 *     bit          0:    _PAGE_GLOBAL (zero)

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 *     bit          1:    _PAGE_VALID (zero)

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 *     bit      2 - 6:    swap type

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 *     bit          7:    exclusive marker

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 *     bit          8:    swap offset[0]

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 *     bit          9:    _PAGE_WRITE (zero)

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 *     bit         10:    _PAGE_PRESENT (zero)

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 *     bit    11 - 31:    swap offset[1 - 21]

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 */

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#define __swp_type(x)			(((x).val >> 2) & 0x1f)

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#define __swp_offset(x)			((((x).val >> 8) & 0x1) | \

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					(((x).val >> 10) & 0x3ffffe))

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#define __swp_entry(type, offset)	((swp_entry_t) { \

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					((type & 0x1f) << 2) | \

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					((offset & 0x1) << 8) | \

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					((offset & 0x3ffffe) << 10)})

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#endif /* __ASM_CSKY_PGTABLE_BITS_H */

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