Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/csky/abiv1/inc/abi/pgtable-bits.h
26607 views
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_PRESENT		(1<<0)

8
#define _PAGE_READ		(1<<1)

9
#define _PAGE_WRITE		(1<<2)

10
#define _PAGE_ACCESSED		(1<<3)

11
#define _PAGE_MODIFIED		(1<<4)

12


13
/* We borrow bit 9 to store the exclusive marker in swap PTEs. */

14
#define _PAGE_SWP_EXCLUSIVE	(1<<9)

15


16
/* implemented in hardware */

17
#define _PAGE_GLOBAL		(1<<6)

18
#define _PAGE_VALID		(1<<7)

19
#define _PAGE_DIRTY		(1<<8)

20


21
#define _PAGE_CACHE		(3<<9)

22
#define _PAGE_UNCACHE		(2<<9)

23
#define _PAGE_SO		_PAGE_UNCACHE

24
#define _CACHE_MASK		(7<<9)

25


26
#define _CACHE_CACHED		_PAGE_CACHE

27
#define _CACHE_UNCACHED		_PAGE_UNCACHE

28


29
#define _PAGE_PROT_NONE		_PAGE_READ

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_PRESENT (zero)

37
 *     bit          1:    _PAGE_READ (zero)

38
 *     bit      2 - 5:    swap type[0 - 3]

39
 *     bit          6:    _PAGE_GLOBAL (zero)

40
 *     bit          7:    _PAGE_VALID (zero)

41
 *     bit          8:    swap type[4]

42
 *     bit          9:    exclusive marker

43
 *     bit    10 - 31:    swap offset

44
 */

45
#define __swp_type(x)			((((x).val >> 2) & 0xf) | \

46
					(((x).val >> 4) & 0x10))

47
#define __swp_offset(x)			((x).val >> 10)

48
#define __swp_entry(type, offset)	((swp_entry_t) { \

49
					((type & 0xf) << 2) | \

50
					((type & 0x10) << 4) | \

51
					((offset) << 10)})

52


53
#define HAVE_ARCH_UNMAPPED_AREA

54


55
#endif /* __ASM_CSKY_PGTABLE_BITS_H */

56


57