projects/linux·blob master · refs

147 lines · 4.8 KiB

1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 */
5
6/*
7 * page table flags for software walked/managed MMUv3 (ARC700) and MMUv4 (HS)
8 * There correspond to the corresponding bits in the TLB
9 */
10
11#ifndef _ASM_ARC_PGTABLE_BITS_ARCV2_H
12#define _ASM_ARC_PGTABLE_BITS_ARCV2_H
13
14#ifdef CONFIG_ARC_CACHE_PAGES
15#define _PAGE_CACHEABLE (1 << 0) /* Cached (H) */
16#else
17#define _PAGE_CACHEABLE 0
18#endif
19
20#define _PAGE_EXECUTE (1 << 1) /* User Execute (H) */
21#define _PAGE_WRITE (1 << 2) /* User Write (H) */
22#define _PAGE_READ (1 << 3) /* User Read (H) */
23#define _PAGE_ACCESSED (1 << 4) /* Accessed (s) */
24#define _PAGE_DIRTY (1 << 5) /* Modified (s) */
25#define _PAGE_SPECIAL (1 << 6)
26#define _PAGE_GLOBAL (1 << 8) /* ASID agnostic (H) */
27#define _PAGE_PRESENT (1 << 9) /* PTE/TLB Valid (H) */
28
29/* We borrow bit 5 to store the exclusive marker in swap PTEs. */
30#define _PAGE_SWP_EXCLUSIVE _PAGE_DIRTY
31
32#ifdef CONFIG_ARC_MMU_V4
33#define _PAGE_HW_SZ (1 << 10) /* Normal/super (H) */
34#else
35#define _PAGE_HW_SZ 0
36#endif
37
38/* Defaults for every user page */
39#define ___DEF (_PAGE_PRESENT | _PAGE_CACHEABLE)
40
41/* Set of bits not changed in pte_modify */
42#define _PAGE_CHG_MASK (PAGE_MASK_PHYS | _PAGE_ACCESSED | _PAGE_DIRTY | \
43 _PAGE_SPECIAL)
44
45/* More Abbrevaited helpers */
46#define PAGE_U_NONE __pgprot(___DEF)
47#define PAGE_U_R __pgprot(___DEF | _PAGE_READ)
48#define PAGE_U_W_R __pgprot(___DEF | _PAGE_READ | _PAGE_WRITE)
49#define PAGE_U_X_R __pgprot(___DEF | _PAGE_READ | _PAGE_EXECUTE)
50#define PAGE_U_X_W_R __pgprot(___DEF \
51 | _PAGE_READ | _PAGE_WRITE | _PAGE_EXECUTE)
52#define PAGE_KERNEL __pgprot(___DEF | _PAGE_GLOBAL \
53 | _PAGE_READ | _PAGE_WRITE | _PAGE_EXECUTE)
54
55#define PAGE_SHARED PAGE_U_W_R
56
57#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CACHEABLE))
58
59/*
60 * Mapping of vm_flags (Generic VM) to PTE flags (arch specific)
61 *
62 * Certain cases have 1:1 mapping
63 * e.g. __P101 means VM_READ, VM_EXEC and !VM_SHARED
64 * which directly corresponds to PAGE_U_X_R
65 *
66 * Other rules which cause the divergence from 1:1 mapping
67 *
68 * 1. Although ARC700 can do exclusive execute/write protection (meaning R
69 * can be tracked independently of X/W unlike some other CPUs), still to
70 * keep things consistent with other archs:
71 * -Write implies Read: W => R
72 * -Execute implies Read: X => R
73 *
74 * 2. Pvt Writable doesn't have Write Enabled initially: Pvt-W => !W
75 * This is to enable COW mechanism
76 */
77 /* xwr */
78#ifndef __ASSEMBLER__
79
80#define pte_write(pte) (pte_val(pte) & _PAGE_WRITE)
81#define pte_dirty(pte) (pte_val(pte) & _PAGE_DIRTY)
82#define pte_young(pte) (pte_val(pte) & _PAGE_ACCESSED)
83#define pte_special(pte) (pte_val(pte) & _PAGE_SPECIAL)
84
85#define PTE_BIT_FUNC(fn, op) \
86 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
87
88PTE_BIT_FUNC(mknotpresent, &= ~(_PAGE_PRESENT));
89PTE_BIT_FUNC(wrprotect, &= ~(_PAGE_WRITE));
90PTE_BIT_FUNC(mkwrite_novma, |= (_PAGE_WRITE));
91PTE_BIT_FUNC(mkclean, &= ~(_PAGE_DIRTY));
92PTE_BIT_FUNC(mkdirty, |= (_PAGE_DIRTY));
93PTE_BIT_FUNC(mkold, &= ~(_PAGE_ACCESSED));
94PTE_BIT_FUNC(mkyoung, |= (_PAGE_ACCESSED));
95PTE_BIT_FUNC(mkspecial, |= (_PAGE_SPECIAL));
96PTE_BIT_FUNC(mkhuge, |= (_PAGE_HW_SZ));
97
98static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
99{
100 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
101}
102
103struct vm_fault;
104void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
105 unsigned long address, pte_t *ptep, unsigned int nr);
106
107#define update_mmu_cache(vma, addr, ptep) \
108 update_mmu_cache_range(NULL, vma, addr, ptep, 1)
109
110/*
111 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
112 * are !pte_none() && !pte_present().
113 *
114 * Format of swap PTEs:
115 *
116 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
117 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
118 * <-------------- offset -------------> <--- zero --> E < type ->
119 *
120 * E is the exclusive marker that is not stored in swap entries.
121 * The zero'ed bits include _PAGE_PRESENT.
122 */
123#define __swp_entry(type, off) ((swp_entry_t) \
124 { ((type) & 0x1f) | ((off) << 13) })
125
126/* Decode a PTE containing swap "identifier "into constituents */
127#define __swp_type(pte_lookalike) (((pte_lookalike).val) & 0x1f)
128#define __swp_offset(pte_lookalike) ((pte_lookalike).val >> 13)
129
130#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
131#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
132
133static inline bool pte_swp_exclusive(pte_t pte)
134{
135 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
136}
137
138PTE_BIT_FUNC(swp_mkexclusive, |= (_PAGE_SWP_EXCLUSIVE));
139PTE_BIT_FUNC(swp_clear_exclusive, &= ~(_PAGE_SWP_EXCLUSIVE));
140
141#ifdef CONFIG_TRANSPARENT_HUGEPAGE
142#include <asm/hugepage.h>
143#endif
144
145#endif /* __ASSEMBLER__ */
146
147#endif