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53492b1d GS |
1 | /* |
2 | * IBM System z Huge TLB Page Support for Kernel. | |
3 | * | |
a53c8fab | 4 | * Copyright IBM Corp. 2007 |
53492b1d GS |
5 | * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com> |
6 | */ | |
7 | ||
8 | #include <linux/mm.h> | |
9 | #include <linux/hugetlb.h> | |
10 | ||
e5098611 MS |
11 | static inline pmd_t __pte_to_pmd(pte_t pte) |
12 | { | |
e5098611 MS |
13 | pmd_t pmd; |
14 | ||
15 | /* | |
152125b7 | 16 | * Convert encoding pte bits pmd bits |
a1c843b8 MS |
17 | * lIR.uswrdy.p dy..R...I...wr |
18 | * empty 010.000000.0 -> 00..0...1...00 | |
19 | * prot-none, clean, old 111.000000.1 -> 00..1...1...00 | |
20 | * prot-none, clean, young 111.000001.1 -> 01..1...1...00 | |
21 | * prot-none, dirty, old 111.000010.1 -> 10..1...1...00 | |
22 | * prot-none, dirty, young 111.000011.1 -> 11..1...1...00 | |
23 | * read-only, clean, old 111.000100.1 -> 00..1...1...01 | |
24 | * read-only, clean, young 101.000101.1 -> 01..1...0...01 | |
25 | * read-only, dirty, old 111.000110.1 -> 10..1...1...01 | |
26 | * read-only, dirty, young 101.000111.1 -> 11..1...0...01 | |
27 | * read-write, clean, old 111.001100.1 -> 00..1...1...11 | |
28 | * read-write, clean, young 101.001101.1 -> 01..1...0...11 | |
29 | * read-write, dirty, old 110.001110.1 -> 10..0...1...11 | |
30 | * read-write, dirty, young 100.001111.1 -> 11..0...0...11 | |
31 | * HW-bits: R read-only, I invalid | |
32 | * SW-bits: p present, y young, d dirty, r read, w write, s special, | |
33 | * u unused, l large | |
e5098611 MS |
34 | */ |
35 | if (pte_present(pte)) { | |
36 | pmd_val(pmd) = pte_val(pte) & PAGE_MASK; | |
152125b7 MS |
37 | pmd_val(pmd) |= (pte_val(pte) & _PAGE_READ) >> 4; |
38 | pmd_val(pmd) |= (pte_val(pte) & _PAGE_WRITE) >> 4; | |
39 | pmd_val(pmd) |= (pte_val(pte) & _PAGE_INVALID) >> 5; | |
40 | pmd_val(pmd) |= (pte_val(pte) & _PAGE_PROTECT); | |
41 | pmd_val(pmd) |= (pte_val(pte) & _PAGE_DIRTY) << 10; | |
42 | pmd_val(pmd) |= (pte_val(pte) & _PAGE_YOUNG) << 10; | |
5614dd92 | 43 | pmd_val(pmd) |= (pte_val(pte) & _PAGE_SOFT_DIRTY) << 13; |
e5098611 MS |
44 | } else |
45 | pmd_val(pmd) = _SEGMENT_ENTRY_INVALID; | |
46 | return pmd; | |
47 | } | |
48 | ||
49 | static inline pte_t __pmd_to_pte(pmd_t pmd) | |
50 | { | |
51 | pte_t pte; | |
52 | ||
53 | /* | |
152125b7 | 54 | * Convert encoding pmd bits pte bits |
a1c843b8 MS |
55 | * dy..R...I...wr lIR.uswrdy.p |
56 | * empty 00..0...1...00 -> 010.000000.0 | |
57 | * prot-none, clean, old 00..1...1...00 -> 111.000000.1 | |
58 | * prot-none, clean, young 01..1...1...00 -> 111.000001.1 | |
59 | * prot-none, dirty, old 10..1...1...00 -> 111.000010.1 | |
60 | * prot-none, dirty, young 11..1...1...00 -> 111.000011.1 | |
61 | * read-only, clean, old 00..1...1...01 -> 111.000100.1 | |
62 | * read-only, clean, young 01..1...0...01 -> 101.000101.1 | |
63 | * read-only, dirty, old 10..1...1...01 -> 111.000110.1 | |
64 | * read-only, dirty, young 11..1...0...01 -> 101.000111.1 | |
65 | * read-write, clean, old 00..1...1...11 -> 111.001100.1 | |
66 | * read-write, clean, young 01..1...0...11 -> 101.001101.1 | |
67 | * read-write, dirty, old 10..0...1...11 -> 110.001110.1 | |
68 | * read-write, dirty, young 11..0...0...11 -> 100.001111.1 | |
69 | * HW-bits: R read-only, I invalid | |
70 | * SW-bits: p present, y young, d dirty, r read, w write, s special, | |
71 | * u unused, l large | |
e5098611 MS |
72 | */ |
73 | if (pmd_present(pmd)) { | |
152125b7 MS |
74 | pte_val(pte) = pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN_LARGE; |
75 | pte_val(pte) |= _PAGE_LARGE | _PAGE_PRESENT; | |
76 | pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_READ) << 4; | |
77 | pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) << 4; | |
78 | pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID) << 5; | |
79 | pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT); | |
b7d14f3a MS |
80 | pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) >> 10; |
81 | pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) >> 10; | |
5614dd92 | 82 | pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY) >> 13; |
e5098611 MS |
83 | } else |
84 | pte_val(pte) = _PAGE_INVALID; | |
85 | return pte; | |
86 | } | |
53492b1d GS |
87 | |
88 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, | |
e5098611 | 89 | pte_t *ptep, pte_t pte) |
53492b1d | 90 | { |
ce415712 | 91 | pmd_t pmd = __pte_to_pmd(pte); |
53492b1d | 92 | |
ce415712 | 93 | pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE; |
e5098611 MS |
94 | *(pmd_t *) ptep = pmd; |
95 | } | |
96 | ||
97 | pte_t huge_ptep_get(pte_t *ptep) | |
98 | { | |
ce415712 | 99 | pmd_t pmd = *(pmd_t *) ptep; |
e5098611 | 100 | |
e5098611 MS |
101 | return __pmd_to_pte(pmd); |
102 | } | |
103 | ||
104 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, | |
105 | unsigned long addr, pte_t *ptep) | |
106 | { | |
107 | pmd_t *pmdp = (pmd_t *) ptep; | |
108 | pte_t pte = huge_ptep_get(ptep); | |
53492b1d | 109 | |
1b948d6c | 110 | pmdp_flush_direct(mm, addr, pmdp); |
e5098611 MS |
111 | pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY; |
112 | return pte; | |
53492b1d GS |
113 | } |
114 | ||
a5516438 AK |
115 | pte_t *huge_pte_alloc(struct mm_struct *mm, |
116 | unsigned long addr, unsigned long sz) | |
53492b1d GS |
117 | { |
118 | pgd_t *pgdp; | |
119 | pud_t *pudp; | |
120 | pmd_t *pmdp = NULL; | |
121 | ||
122 | pgdp = pgd_offset(mm, addr); | |
123 | pudp = pud_alloc(mm, pgdp, addr); | |
124 | if (pudp) | |
125 | pmdp = pmd_alloc(mm, pudp, addr); | |
126 | return (pte_t *) pmdp; | |
127 | } | |
128 | ||
129 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) | |
130 | { | |
131 | pgd_t *pgdp; | |
132 | pud_t *pudp; | |
133 | pmd_t *pmdp = NULL; | |
134 | ||
135 | pgdp = pgd_offset(mm, addr); | |
136 | if (pgd_present(*pgdp)) { | |
137 | pudp = pud_offset(pgdp, addr); | |
138 | if (pud_present(*pudp)) | |
139 | pmdp = pmd_offset(pudp, addr); | |
140 | } | |
141 | return (pte_t *) pmdp; | |
142 | } | |
143 | ||
53492b1d GS |
144 | int pmd_huge(pmd_t pmd) |
145 | { | |
cbd7d9c2 | 146 | return pmd_large(pmd); |
53492b1d GS |
147 | } |
148 | ||
ceb86879 AK |
149 | int pud_huge(pud_t pud) |
150 | { | |
151 | return 0; | |
152 | } |