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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 */
5
6#ifndef _ASM_RISCV_PGTABLE_BITS_H
7#define _ASM_RISCV_PGTABLE_BITS_H
8
9#define _PAGE_ACCESSED_OFFSET 6
10
11#define _PAGE_PRESENT (1 << 0)
12#define _PAGE_READ (1 << 1) /* Readable */
13#define _PAGE_WRITE (1 << 2) /* Writable */
14#define _PAGE_EXEC (1 << 3) /* Executable */
15#define _PAGE_USER (1 << 4) /* User */
16#define _PAGE_GLOBAL (1 << 5) /* Global */
17#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
18#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
19#define _PAGE_SOFT (3 << 8) /* Reserved for software */
20
21#define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */
22
23#ifdef CONFIG_MEM_SOFT_DIRTY
24
25/* ext_svrsw60t59b: bit 59 for soft-dirty tracking */
26#define _PAGE_SOFT_DIRTY \
27 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
28 (1UL << 59) : 0)
29/*
30 * Bit 3 is always zero for swap entry computation, so we
31 * can borrow it for swap page soft-dirty tracking.
32 */
33#define _PAGE_SWP_SOFT_DIRTY \
34 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
35 _PAGE_EXEC : 0)
36#else
37#define _PAGE_SOFT_DIRTY 0
38#define _PAGE_SWP_SOFT_DIRTY 0
39#endif /* CONFIG_MEM_SOFT_DIRTY */
40
41#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
42
43/* ext_svrsw60t59b: Bit(60) for userfaultfd tracking */
44#define _PAGE_UFFD \
45 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
46 (1UL << 60) : 0)
47/*
48 * Bit 4 is not involved into swap entry computation, so we
49 * can borrow it for swap page userfaultfd tracking.
50 */
51#define _PAGE_SWP_UFFD \
52 ((riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)) ? \
53 _PAGE_USER : 0)
54#else
55#define _PAGE_UFFD 0
56#define _PAGE_SWP_UFFD 0
57#endif
58
59#define _PAGE_TABLE _PAGE_PRESENT
60
61/*
62 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
63 * distinguish them from swapped out pages
64 */
65#define _PAGE_PROT_NONE _PAGE_GLOBAL
66
67/* Used for swap PTEs only. */
68#define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED
69
70#define _PAGE_PFN_SHIFT 10
71
72/*
73 * when all of R/W/X are zero, the PTE is a pointer to the next level
74 * of the page table; otherwise, it is a leaf PTE.
75 */
76#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
77
78#endif /* _ASM_RISCV_PGTABLE_BITS_H */