Linux kernel mirror (for testing)
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linux
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_NO_READ_SHIFT 61
26#define _PAGE_NO_EXEC_SHIFT 62
27#define _PAGE_RPLV_SHIFT 63
28
29/* Used by software */
30#define _PAGE_PRESENT (_ULCAST_(1) << _PAGE_PRESENT_SHIFT)
31#define _PAGE_WRITE (_ULCAST_(1) << _PAGE_WRITE_SHIFT)
32#define _PAGE_ACCESSED (_ULCAST_(1) << _PAGE_ACCESSED_SHIFT)
33#define _PAGE_MODIFIED (_ULCAST_(1) << _PAGE_MODIFIED_SHIFT)
34#define _PAGE_PROTNONE (_ULCAST_(1) << _PAGE_PROTNONE_SHIFT)
35#define _PAGE_SPECIAL (_ULCAST_(1) << _PAGE_SPECIAL_SHIFT)
36
37/* We borrow bit 23 to store the exclusive marker in swap PTEs. */
38#define _PAGE_SWP_EXCLUSIVE (_ULCAST_(1) << _PAGE_SWP_EXCLUSIVE_SHIFT)
39
40/* Used by TLB hardware (placed in EntryLo*) */
41#define _PAGE_VALID (_ULCAST_(1) << _PAGE_VALID_SHIFT)
42#define _PAGE_DIRTY (_ULCAST_(1) << _PAGE_DIRTY_SHIFT)
43#define _PAGE_PLV (_ULCAST_(3) << _PAGE_PLV_SHIFT)
44#define _PAGE_GLOBAL (_ULCAST_(1) << _PAGE_GLOBAL_SHIFT)
45#define _PAGE_HUGE (_ULCAST_(1) << _PAGE_HUGE_SHIFT)
46#define _PAGE_HGLOBAL (_ULCAST_(1) << _PAGE_HGLOBAL_SHIFT)
47#define _PAGE_NO_READ (_ULCAST_(1) << _PAGE_NO_READ_SHIFT)
48#define _PAGE_NO_EXEC (_ULCAST_(1) << _PAGE_NO_EXEC_SHIFT)
49#define _PAGE_RPLV (_ULCAST_(1) << _PAGE_RPLV_SHIFT)
50#define _CACHE_MASK (_ULCAST_(3) << _CACHE_SHIFT)
51#define _PFN_SHIFT (PAGE_SHIFT - 12 + _PAGE_PFN_SHIFT)
52
53#define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT)
54#define _PAGE_KERN (PLV_KERN << _PAGE_PLV_SHIFT)
55
56#define _PFN_MASK (~((_ULCAST_(1) << (_PFN_SHIFT)) - 1) & \
57 ((_ULCAST_(1) << (_PAGE_PFN_END_SHIFT)) - 1))
58
59/*
60 * Cache attributes
61 */
62#ifndef _CACHE_SUC
63#define _CACHE_SUC (0<<_CACHE_SHIFT) /* Strong-ordered UnCached */
64#endif
65#ifndef _CACHE_CC
66#define _CACHE_CC (1<<_CACHE_SHIFT) /* Coherent Cached */
67#endif
68#ifndef _CACHE_WUC
69#define _CACHE_WUC (2<<_CACHE_SHIFT) /* Weak-ordered UnCached */
70#endif
71
72#define __READABLE (_PAGE_VALID)
73#define __WRITEABLE (_PAGE_DIRTY | _PAGE_WRITE)
74
75#define _PAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV)
76#define _HPAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE)
77
78#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_NO_READ | \
79 _PAGE_USER | _CACHE_CC)
80#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
81 _PAGE_USER | _CACHE_CC)
82#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _CACHE_CC)
83
84#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
85 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_CC)
86#define PAGE_KERNEL_SUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
87 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_SUC)
88#define PAGE_KERNEL_WUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
89 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_WUC)
90
91#ifndef __ASSEMBLY__
92
93#define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL_SUC)
94
95#define pgprot_noncached pgprot_noncached
96
97static inline pgprot_t pgprot_noncached(pgprot_t _prot)
98{
99 unsigned long prot = pgprot_val(_prot);
100
101 prot = (prot & ~_CACHE_MASK) | _CACHE_SUC;
102
103 return __pgprot(prot);
104}
105
106#define pgprot_writecombine pgprot_writecombine
107
108static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
109{
110 unsigned long prot = pgprot_val(_prot);
111
112 prot = (prot & ~_CACHE_MASK) | _CACHE_WUC;
113
114 return __pgprot(prot);
115}
116
117#endif /* !__ASSEMBLY__ */
118
119#endif /* _ASM_PGTABLE_BITS_H */