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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 */
5#ifndef _ASM_PGTABLE_BITS_H
6#define _ASM_PGTABLE_BITS_H
7
8/* Page table bits */
9#define _PAGE_VALID_SHIFT 0
10#define _PAGE_ACCESSED_SHIFT 0 /* Reuse Valid for Accessed */
11#define _PAGE_DIRTY_SHIFT 1
12#define _PAGE_PLV_SHIFT 2 /* 2~3, two bits */
13#define _CACHE_SHIFT 4 /* 4~5, two bits */
14#define _PAGE_GLOBAL_SHIFT 6
15#define _PAGE_HUGE_SHIFT 6 /* HUGE is a PMD bit */
16#define _PAGE_PRESENT_SHIFT 7
17#define _PAGE_WRITE_SHIFT 8
18#define _PAGE_MODIFIED_SHIFT 9
19#define _PAGE_PROTNONE_SHIFT 10
20#define _PAGE_SPECIAL_SHIFT 11
21#define _PAGE_HGLOBAL_SHIFT 12 /* HGlobal is a PMD bit */
22#define _PAGE_PFN_SHIFT 12
23#define _PAGE_SWP_EXCLUSIVE_SHIFT 23
24#define _PAGE_PFN_END_SHIFT 48
25#define _PAGE_DEVMAP_SHIFT 59
26#define _PAGE_PRESENT_INVALID_SHIFT 60
27#define _PAGE_NO_READ_SHIFT 61
28#define _PAGE_NO_EXEC_SHIFT 62
29#define _PAGE_RPLV_SHIFT 63
30
31/* Used by software */
32#define _PAGE_PRESENT (_ULCAST_(1) << _PAGE_PRESENT_SHIFT)
33#define _PAGE_PRESENT_INVALID (_ULCAST_(1) << _PAGE_PRESENT_INVALID_SHIFT)
34#define _PAGE_WRITE (_ULCAST_(1) << _PAGE_WRITE_SHIFT)
35#define _PAGE_ACCESSED (_ULCAST_(1) << _PAGE_ACCESSED_SHIFT)
36#define _PAGE_MODIFIED (_ULCAST_(1) << _PAGE_MODIFIED_SHIFT)
37#define _PAGE_PROTNONE (_ULCAST_(1) << _PAGE_PROTNONE_SHIFT)
38#define _PAGE_SPECIAL (_ULCAST_(1) << _PAGE_SPECIAL_SHIFT)
39#define _PAGE_DEVMAP (_ULCAST_(1) << _PAGE_DEVMAP_SHIFT)
40
41/* We borrow bit 23 to store the exclusive marker in swap PTEs. */
42#define _PAGE_SWP_EXCLUSIVE (_ULCAST_(1) << _PAGE_SWP_EXCLUSIVE_SHIFT)
43
44/* Used by TLB hardware (placed in EntryLo*) */
45#define _PAGE_VALID (_ULCAST_(1) << _PAGE_VALID_SHIFT)
46#define _PAGE_DIRTY (_ULCAST_(1) << _PAGE_DIRTY_SHIFT)
47#define _PAGE_PLV (_ULCAST_(3) << _PAGE_PLV_SHIFT)
48#define _PAGE_GLOBAL (_ULCAST_(1) << _PAGE_GLOBAL_SHIFT)
49#define _PAGE_HUGE (_ULCAST_(1) << _PAGE_HUGE_SHIFT)
50#define _PAGE_HGLOBAL (_ULCAST_(1) << _PAGE_HGLOBAL_SHIFT)
51#define _PAGE_NO_READ (_ULCAST_(1) << _PAGE_NO_READ_SHIFT)
52#define _PAGE_NO_EXEC (_ULCAST_(1) << _PAGE_NO_EXEC_SHIFT)
53#define _PAGE_RPLV (_ULCAST_(1) << _PAGE_RPLV_SHIFT)
54#define _CACHE_MASK (_ULCAST_(3) << _CACHE_SHIFT)
55#define PFN_PTE_SHIFT (PAGE_SHIFT - 12 + _PAGE_PFN_SHIFT)
56
57#define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT)
58#define _PAGE_KERN (PLV_KERN << _PAGE_PLV_SHIFT)
59
60#define _PFN_MASK (~((_ULCAST_(1) << (PFN_PTE_SHIFT)) - 1) & \
61 ((_ULCAST_(1) << (_PAGE_PFN_END_SHIFT)) - 1))
62
63/*
64 * Cache attributes
65 */
66#ifndef _CACHE_SUC
67#define _CACHE_SUC (0<<_CACHE_SHIFT) /* Strong-ordered UnCached */
68#endif
69#ifndef _CACHE_CC
70#define _CACHE_CC (1<<_CACHE_SHIFT) /* Coherent Cached */
71#endif
72#ifndef _CACHE_WUC
73#define _CACHE_WUC (2<<_CACHE_SHIFT) /* Weak-ordered UnCached */
74#endif
75
76#define __READABLE (_PAGE_VALID)
77#define __WRITEABLE (_PAGE_DIRTY | _PAGE_WRITE)
78
79#define _PAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV)
80#define _HPAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE)
81
82#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_NO_READ | \
83 _PAGE_USER | _CACHE_CC)
84#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
85 _PAGE_USER | _CACHE_CC)
86#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _CACHE_CC)
87
88#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
89 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_CC)
90#define PAGE_KERNEL_SUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
91 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_SUC)
92#define PAGE_KERNEL_WUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
93 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_WUC)
94
95#ifndef __ASSEMBLY__
96
97#define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL_SUC)
98
99#define pgprot_noncached pgprot_noncached
100
101static inline pgprot_t pgprot_noncached(pgprot_t _prot)
102{
103 unsigned long prot = pgprot_val(_prot);
104
105 prot = (prot & ~_CACHE_MASK) | _CACHE_SUC;
106
107 return __pgprot(prot);
108}
109
110extern bool wc_enabled;
111
112#define pgprot_writecombine pgprot_writecombine
113
114static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
115{
116 unsigned long prot = pgprot_val(_prot);
117
118 prot = (prot & ~_CACHE_MASK) | (wc_enabled ? _CACHE_WUC : _CACHE_SUC);
119
120 return __pgprot(prot);
121}
122
123#endif /* !__ASSEMBLY__ */
124
125#endif /* _ASM_PGTABLE_BITS_H */