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1da177e4 LT |
1 | /* |
2 | * include/asm-s390/pgalloc.h | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Hartmut Penner (hp@de.ibm.com) | |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
8 | * | |
9 | * Derived from "include/asm-i386/pgalloc.h" | |
10 | * Copyright (C) 1994 Linus Torvalds | |
11 | */ | |
12 | ||
13 | #ifndef _S390_PGALLOC_H | |
14 | #define _S390_PGALLOC_H | |
15 | ||
1da177e4 LT |
16 | #include <linux/threads.h> |
17 | #include <linux/gfp.h> | |
18 | #include <linux/mm.h> | |
19 | ||
20 | #define check_pgt_cache() do {} while (0) | |
21 | ||
3610cce8 | 22 | unsigned long *crst_table_alloc(struct mm_struct *, int); |
146e4b3c | 23 | void crst_table_free(struct mm_struct *, unsigned long *); |
9282ed92 | 24 | |
146e4b3c MS |
25 | unsigned long *page_table_alloc(struct mm_struct *); |
26 | void page_table_free(struct mm_struct *, unsigned long *); | |
27 | void disable_noexec(struct mm_struct *, struct task_struct *); | |
1da177e4 | 28 | |
3610cce8 | 29 | static inline void clear_table(unsigned long *s, unsigned long val, size_t n) |
1da177e4 | 30 | { |
4f7e90d6 MS |
31 | typedef struct { char _[n]; } addrtype; |
32 | ||
3610cce8 MS |
33 | *s = val; |
34 | n = (n / 256) - 1; | |
35 | asm volatile( | |
36 | #ifdef CONFIG_64BIT | |
37 | " mvc 8(248,%0),0(%0)\n" | |
9282ed92 | 38 | #else |
3610cce8 | 39 | " mvc 4(252,%0),0(%0)\n" |
9282ed92 | 40 | #endif |
3610cce8 MS |
41 | "0: mvc 256(256,%0),0(%0)\n" |
42 | " la %0,256(%0)\n" | |
43 | " brct %1,0b\n" | |
4f7e90d6 MS |
44 | : "+a" (s), "+d" (n), "=m" (*(addrtype *) s) |
45 | : "m" (*(addrtype *) s)); | |
1da177e4 LT |
46 | } |
47 | ||
3610cce8 | 48 | static inline void crst_table_init(unsigned long *crst, unsigned long entry) |
1da177e4 | 49 | { |
3610cce8 MS |
50 | clear_table(crst, entry, sizeof(unsigned long)*2048); |
51 | crst = get_shadow_table(crst); | |
52 | if (crst) | |
53 | clear_table(crst, entry, sizeof(unsigned long)*2048); | |
1da177e4 LT |
54 | } |
55 | ||
56 | #ifndef __s390x__ | |
3610cce8 MS |
57 | |
58 | static inline unsigned long pgd_entry_type(struct mm_struct *mm) | |
59 | { | |
60 | return _SEGMENT_ENTRY_EMPTY; | |
61 | } | |
62 | ||
190a1d72 | 63 | #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); }) |
5e541973 | 64 | #define pud_free(mm, x) do { } while (0) |
190a1d72 | 65 | |
3610cce8 | 66 | #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) |
5e541973 | 67 | #define pmd_free(mm, x) do { } while (0) |
3610cce8 | 68 | |
190a1d72 MS |
69 | #define pgd_populate(mm, pgd, pud) BUG() |
70 | #define pgd_populate_kernel(mm, pgd, pud) BUG() | |
71 | ||
72 | #define pud_populate(mm, pud, pmd) BUG() | |
73 | #define pud_populate_kernel(mm, pud, pmd) BUG() | |
3610cce8 | 74 | |
1da177e4 | 75 | #else /* __s390x__ */ |
3610cce8 MS |
76 | |
77 | static inline unsigned long pgd_entry_type(struct mm_struct *mm) | |
1da177e4 | 78 | { |
6252d702 MS |
79 | if (mm->context.asce_limit <= (1UL << 31)) |
80 | return _SEGMENT_ENTRY_EMPTY; | |
81 | if (mm->context.asce_limit <= (1UL << 42)) | |
82 | return _REGION3_ENTRY_EMPTY; | |
5a216a20 | 83 | return _REGION2_ENTRY_EMPTY; |
1da177e4 LT |
84 | } |
85 | ||
6252d702 MS |
86 | int crst_table_upgrade(struct mm_struct *, unsigned long limit); |
87 | void crst_table_downgrade(struct mm_struct *, unsigned long limit); | |
88 | ||
5a216a20 MS |
89 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) |
90 | { | |
91 | unsigned long *table = crst_table_alloc(mm, mm->context.noexec); | |
92 | if (table) | |
93 | crst_table_init(table, _REGION3_ENTRY_EMPTY); | |
94 | return (pud_t *) table; | |
95 | } | |
96 | #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud) | |
190a1d72 | 97 | |
3610cce8 | 98 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) |
1da177e4 | 99 | { |
146e4b3c MS |
100 | unsigned long *table = crst_table_alloc(mm, mm->context.noexec); |
101 | if (table) | |
102 | crst_table_init(table, _SEGMENT_ENTRY_EMPTY); | |
103 | return (pmd_t *) table; | |
1da177e4 | 104 | } |
146e4b3c | 105 | #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd) |
1da177e4 | 106 | |
5a216a20 MS |
107 | static inline void pgd_populate_kernel(struct mm_struct *mm, |
108 | pgd_t *pgd, pud_t *pud) | |
109 | { | |
110 | pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud); | |
111 | } | |
112 | ||
113 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) | |
114 | { | |
5a216a20 | 115 | pgd_populate_kernel(mm, pgd, pud); |
6252d702 MS |
116 | if (mm->context.noexec) { |
117 | pgd = get_shadow_table(pgd); | |
118 | pud = get_shadow_table(pud); | |
119 | pgd_populate_kernel(mm, pgd, pud); | |
120 | } | |
5a216a20 | 121 | } |
190a1d72 MS |
122 | |
123 | static inline void pud_populate_kernel(struct mm_struct *mm, | |
124 | pud_t *pud, pmd_t *pmd) | |
1da177e4 | 125 | { |
190a1d72 | 126 | pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); |
1da177e4 LT |
127 | } |
128 | ||
190a1d72 | 129 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
c1821c2e | 130 | { |
190a1d72 | 131 | pud_populate_kernel(mm, pud, pmd); |
146e4b3c MS |
132 | if (mm->context.noexec) { |
133 | pud = get_shadow_table(pud); | |
134 | pmd = get_shadow_table(pmd); | |
135 | pud_populate_kernel(mm, pud, pmd); | |
136 | } | |
c1821c2e GS |
137 | } |
138 | ||
1da177e4 LT |
139 | #endif /* __s390x__ */ |
140 | ||
3610cce8 MS |
141 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
142 | { | |
50aa98ba | 143 | spin_lock_init(&mm->context.list_lock); |
146e4b3c MS |
144 | INIT_LIST_HEAD(&mm->context.crst_list); |
145 | INIT_LIST_HEAD(&mm->context.pgtable_list); | |
b11b5334 MS |
146 | return (pgd_t *) |
147 | crst_table_alloc(mm, user_mode == SECONDARY_SPACE_MODE); | |
3610cce8 | 148 | } |
146e4b3c | 149 | #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd) |
3610cce8 | 150 | |
146e4b3c MS |
151 | static inline void pmd_populate_kernel(struct mm_struct *mm, |
152 | pmd_t *pmd, pte_t *pte) | |
1da177e4 | 153 | { |
3610cce8 | 154 | pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); |
1da177e4 LT |
155 | } |
156 | ||
146e4b3c MS |
157 | static inline void pmd_populate(struct mm_struct *mm, |
158 | pmd_t *pmd, pgtable_t pte) | |
1da177e4 | 159 | { |
c1821c2e | 160 | pmd_populate_kernel(mm, pmd, pte); |
146e4b3c MS |
161 | if (mm->context.noexec) { |
162 | pmd = get_shadow_table(pmd); | |
163 | pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE); | |
164 | } | |
1da177e4 | 165 | } |
146e4b3c MS |
166 | |
167 | #define pmd_pgtable(pmd) \ | |
168 | (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) | |
1da177e4 LT |
169 | |
170 | /* | |
171 | * page table entry allocation/free routines. | |
172 | */ | |
146e4b3c MS |
173 | #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) |
174 | #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) | |
175 | ||
176 | #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) | |
177 | #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) | |
1da177e4 | 178 | |
1da177e4 | 179 | #endif /* _S390_PGALLOC_H */ |