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 
pgprot_noncached(pgprot_t _prot)97 static 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 
pgprot_writecombine(pgprot_t _prot)108 static 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 */
120