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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 | ||
043d0708 | 20 | unsigned long *crst_table_alloc(struct mm_struct *); |
146e4b3c | 21 | void crst_table_free(struct mm_struct *, unsigned long *); |
9282ed92 | 22 | |
146e4b3c MS |
23 | unsigned long *page_table_alloc(struct mm_struct *); |
24 | void page_table_free(struct mm_struct *, unsigned long *); | |
36409f63 MS |
25 | #ifdef CONFIG_HAVE_RCU_TABLE_FREE |
26 | void page_table_free_rcu(struct mmu_gather *, unsigned long *); | |
27 | void __tlb_remove_table(void *_table); | |
28 | #endif | |
1da177e4 | 29 | |
3610cce8 | 30 | static inline void clear_table(unsigned long *s, unsigned long val, size_t n) |
1da177e4 | 31 | { |
4f7e90d6 MS |
32 | typedef struct { char _[n]; } addrtype; |
33 | ||
3610cce8 MS |
34 | *s = val; |
35 | n = (n / 256) - 1; | |
36 | asm volatile( | |
37 | #ifdef CONFIG_64BIT | |
38 | " mvc 8(248,%0),0(%0)\n" | |
9282ed92 | 39 | #else |
3610cce8 | 40 | " mvc 4(252,%0),0(%0)\n" |
9282ed92 | 41 | #endif |
3610cce8 MS |
42 | "0: mvc 256(256,%0),0(%0)\n" |
43 | " la %0,256(%0)\n" | |
44 | " brct %1,0b\n" | |
4f7e90d6 MS |
45 | : "+a" (s), "+d" (n), "=m" (*(addrtype *) s) |
46 | : "m" (*(addrtype *) s)); | |
1da177e4 LT |
47 | } |
48 | ||
3610cce8 | 49 | static inline void crst_table_init(unsigned long *crst, unsigned long entry) |
1da177e4 | 50 | { |
3610cce8 | 51 | clear_table(crst, entry, sizeof(unsigned long)*2048); |
1da177e4 LT |
52 | } |
53 | ||
54 | #ifndef __s390x__ | |
3610cce8 MS |
55 | |
56 | static inline unsigned long pgd_entry_type(struct mm_struct *mm) | |
57 | { | |
58 | return _SEGMENT_ENTRY_EMPTY; | |
59 | } | |
60 | ||
190a1d72 | 61 | #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); }) |
5e541973 | 62 | #define pud_free(mm, x) do { } while (0) |
190a1d72 | 63 | |
3610cce8 | 64 | #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) |
5e541973 | 65 | #define pmd_free(mm, x) do { } while (0) |
3610cce8 | 66 | |
190a1d72 | 67 | #define pgd_populate(mm, pgd, pud) BUG() |
190a1d72 | 68 | #define pud_populate(mm, pud, pmd) BUG() |
3610cce8 | 69 | |
1da177e4 | 70 | #else /* __s390x__ */ |
3610cce8 MS |
71 | |
72 | static inline unsigned long pgd_entry_type(struct mm_struct *mm) | |
1da177e4 | 73 | { |
6252d702 MS |
74 | if (mm->context.asce_limit <= (1UL << 31)) |
75 | return _SEGMENT_ENTRY_EMPTY; | |
76 | if (mm->context.asce_limit <= (1UL << 42)) | |
77 | return _REGION3_ENTRY_EMPTY; | |
5a216a20 | 78 | return _REGION2_ENTRY_EMPTY; |
1da177e4 LT |
79 | } |
80 | ||
6252d702 MS |
81 | int crst_table_upgrade(struct mm_struct *, unsigned long limit); |
82 | void crst_table_downgrade(struct mm_struct *, unsigned long limit); | |
83 | ||
5a216a20 MS |
84 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) |
85 | { | |
043d0708 | 86 | unsigned long *table = crst_table_alloc(mm); |
5a216a20 MS |
87 | if (table) |
88 | crst_table_init(table, _REGION3_ENTRY_EMPTY); | |
89 | return (pud_t *) table; | |
90 | } | |
91 | #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud) | |
190a1d72 | 92 | |
3610cce8 | 93 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) |
1da177e4 | 94 | { |
043d0708 | 95 | unsigned long *table = crst_table_alloc(mm); |
146e4b3c MS |
96 | if (table) |
97 | crst_table_init(table, _SEGMENT_ENTRY_EMPTY); | |
98 | return (pmd_t *) table; | |
1da177e4 | 99 | } |
146e4b3c | 100 | #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd) |
1da177e4 | 101 | |
5a216a20 MS |
102 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) |
103 | { | |
b2fa47e6 | 104 | pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud); |
1da177e4 LT |
105 | } |
106 | ||
190a1d72 | 107 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
c1821c2e | 108 | { |
b2fa47e6 | 109 | pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); |
c1821c2e GS |
110 | } |
111 | ||
1da177e4 LT |
112 | #endif /* __s390x__ */ |
113 | ||
3610cce8 MS |
114 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
115 | { | |
50aa98ba | 116 | spin_lock_init(&mm->context.list_lock); |
146e4b3c | 117 | INIT_LIST_HEAD(&mm->context.pgtable_list); |
043d0708 | 118 | return (pgd_t *) crst_table_alloc(mm); |
3610cce8 | 119 | } |
146e4b3c | 120 | #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd) |
3610cce8 | 121 | |
146e4b3c MS |
122 | static inline void pmd_populate(struct mm_struct *mm, |
123 | pmd_t *pmd, pgtable_t pte) | |
1da177e4 | 124 | { |
b2fa47e6 | 125 | pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); |
1da177e4 | 126 | } |
146e4b3c | 127 | |
b2fa47e6 MS |
128 | #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) |
129 | ||
146e4b3c MS |
130 | #define pmd_pgtable(pmd) \ |
131 | (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) | |
1da177e4 LT |
132 | |
133 | /* | |
134 | * page table entry allocation/free routines. | |
135 | */ | |
146e4b3c MS |
136 | #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) |
137 | #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) | |
138 | ||
139 | #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) | |
140 | #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) | |
1da177e4 | 141 | |
80217147 MS |
142 | extern void rcu_table_freelist_finish(void); |
143 | ||
1da177e4 | 144 | #endif /* _S390_PGALLOC_H */ |