1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __ASM_CSKY_PGTABLE_BITS_H
4#define __ASM_CSKY_PGTABLE_BITS_H
5
6/* implemented in software */
7#define _PAGE_ACCESSED		(1<<7)
8#define _PAGE_READ		(1<<8)
9#define _PAGE_WRITE		(1<<9)
10#define _PAGE_PRESENT		(1<<10)
11#define _PAGE_MODIFIED		(1<<11)
12
13/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
14#define _PAGE_SWP_EXCLUSIVE	(1<<7)
15
16/* implemented in hardware */
17#define _PAGE_GLOBAL		(1<<0)
18#define _PAGE_VALID		(1<<1)
19#define _PAGE_DIRTY		(1<<2)
20
21#define _PAGE_SO		(1<<5)
22#define _PAGE_BUF		(1<<6)
23#define _PAGE_CACHE		(1<<3)
24#define _CACHE_MASK		_PAGE_CACHE
25
26#define _CACHE_CACHED		(_PAGE_CACHE | _PAGE_BUF)
27#define _CACHE_UNCACHED		(0)
28
29#define _PAGE_PROT_NONE		_PAGE_WRITE
30
31/*
32 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
33 * are !pte_none() && !pte_present().
34 *
35 * Format of swap PTE:
36 *     bit          0:    _PAGE_GLOBAL (zero)
37 *     bit          1:    _PAGE_VALID (zero)
38 *     bit      2 - 6:    swap type
39 *     bit          7:    exclusive marker
40 *     bit          8:    swap offset[0]
41 *     bit          9:    _PAGE_WRITE (zero)
42 *     bit         10:    _PAGE_PRESENT (zero)
43 *     bit    11 - 31:    swap offset[1 - 21]
44 */
45#define __swp_type(x)			(((x).val >> 2) & 0x1f)
46#define __swp_offset(x)			((((x).val >> 8) & 0x1) | \
47					(((x).val >> 10) & 0x3ffffe))
48#define __swp_entry(type, offset)	((swp_entry_t) { \
49					((type & 0x1f) << 2) | \
50					((offset & 0x1) << 8) | \
51					((offset & 0x3ffffe) << 10)})
52
53#endif /* __ASM_CSKY_PGTABLE_BITS_H */
54