Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * S390 version |
a53c8fab | 3 | * Copyright IBM Corp. 1999, 2000 |
1da177e4 LT |
4 | * Author(s): Hartmut Penner (hp@de.ibm.com) |
5 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
6 | * | |
7 | * Derived from "include/asm-i386/pgalloc.h" | |
8 | * Copyright (C) 1994 Linus Torvalds | |
9 | */ | |
10 | ||
11 | #ifndef _S390_PGALLOC_H | |
12 | #define _S390_PGALLOC_H | |
13 | ||
1da177e4 LT |
14 | #include <linux/threads.h> |
15 | #include <linux/gfp.h> | |
16 | #include <linux/mm.h> | |
17 | ||
043d0708 | 18 | unsigned long *crst_table_alloc(struct mm_struct *); |
146e4b3c | 19 | void crst_table_free(struct mm_struct *, unsigned long *); |
9282ed92 | 20 | |
527e30b4 | 21 | unsigned long *page_table_alloc(struct mm_struct *); |
146e4b3c | 22 | void page_table_free(struct mm_struct *, unsigned long *); |
527e30b4 | 23 | void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long); |
0b46e0a3 | 24 | extern int page_table_allocate_pgste; |
1da177e4 | 25 | |
3610cce8 | 26 | static inline void clear_table(unsigned long *s, unsigned long val, size_t n) |
1da177e4 | 27 | { |
4f7e90d6 MS |
28 | typedef struct { char _[n]; } addrtype; |
29 | ||
3610cce8 MS |
30 | *s = val; |
31 | n = (n / 256) - 1; | |
32 | asm volatile( | |
3610cce8 | 33 | " mvc 8(248,%0),0(%0)\n" |
3610cce8 MS |
34 | "0: mvc 256(256,%0),0(%0)\n" |
35 | " la %0,256(%0)\n" | |
36 | " brct %1,0b\n" | |
4f7e90d6 MS |
37 | : "+a" (s), "+d" (n), "=m" (*(addrtype *) s) |
38 | : "m" (*(addrtype *) s)); | |
1da177e4 LT |
39 | } |
40 | ||
3610cce8 | 41 | static inline void crst_table_init(unsigned long *crst, unsigned long entry) |
1da177e4 | 42 | { |
3610cce8 | 43 | clear_table(crst, entry, sizeof(unsigned long)*2048); |
1da177e4 LT |
44 | } |
45 | ||
3610cce8 | 46 | static inline unsigned long pgd_entry_type(struct mm_struct *mm) |
1da177e4 | 47 | { |
6252d702 MS |
48 | if (mm->context.asce_limit <= (1UL << 31)) |
49 | return _SEGMENT_ENTRY_EMPTY; | |
50 | if (mm->context.asce_limit <= (1UL << 42)) | |
51 | return _REGION3_ENTRY_EMPTY; | |
5a216a20 | 52 | return _REGION2_ENTRY_EMPTY; |
1da177e4 LT |
53 | } |
54 | ||
6252d702 MS |
55 | int crst_table_upgrade(struct mm_struct *, unsigned long limit); |
56 | void crst_table_downgrade(struct mm_struct *, unsigned long limit); | |
57 | ||
5a216a20 MS |
58 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) |
59 | { | |
043d0708 | 60 | unsigned long *table = crst_table_alloc(mm); |
5a216a20 MS |
61 | if (table) |
62 | crst_table_init(table, _REGION3_ENTRY_EMPTY); | |
63 | return (pud_t *) table; | |
64 | } | |
65 | #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud) | |
190a1d72 | 66 | |
3610cce8 | 67 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) |
1da177e4 | 68 | { |
043d0708 | 69 | unsigned long *table = crst_table_alloc(mm); |
ec66ad66 MS |
70 | |
71 | if (!table) | |
72 | return NULL; | |
73 | crst_table_init(table, _SEGMENT_ENTRY_EMPTY); | |
74 | if (!pgtable_pmd_page_ctor(virt_to_page(table))) { | |
75 | crst_table_free(mm, table); | |
76 | return NULL; | |
77 | } | |
146e4b3c | 78 | return (pmd_t *) table; |
1da177e4 | 79 | } |
ec66ad66 MS |
80 | |
81 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) | |
82 | { | |
83 | pgtable_pmd_page_dtor(virt_to_page(pmd)); | |
84 | crst_table_free(mm, (unsigned long *) pmd); | |
85 | } | |
1da177e4 | 86 | |
5a216a20 MS |
87 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) |
88 | { | |
b2fa47e6 | 89 | pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud); |
1da177e4 LT |
90 | } |
91 | ||
190a1d72 | 92 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
c1821c2e | 93 | { |
b2fa47e6 | 94 | pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); |
c1821c2e GS |
95 | } |
96 | ||
3610cce8 MS |
97 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
98 | { | |
3446c13b MS |
99 | unsigned long *table = crst_table_alloc(mm); |
100 | ||
101 | if (!table) | |
102 | return NULL; | |
103 | if (mm->context.asce_limit == (1UL << 31)) { | |
104 | /* Forking a compat process with 2 page table levels */ | |
105 | if (!pgtable_pmd_page_ctor(virt_to_page(table))) { | |
106 | crst_table_free(mm, table); | |
107 | return NULL; | |
108 | } | |
109 | } | |
110 | return (pgd_t *) table; | |
111 | } | |
112 | ||
113 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) | |
114 | { | |
115 | if (mm->context.asce_limit == (1UL << 31)) | |
116 | pgtable_pmd_page_dtor(virt_to_page(pgd)); | |
117 | crst_table_free(mm, (unsigned long *) pgd); | |
3610cce8 | 118 | } |
3610cce8 | 119 | |
146e4b3c MS |
120 | static inline void pmd_populate(struct mm_struct *mm, |
121 | pmd_t *pmd, pgtable_t pte) | |
1da177e4 | 122 | { |
b2fa47e6 | 123 | pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); |
1da177e4 | 124 | } |
146e4b3c | 125 | |
b2fa47e6 MS |
126 | #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) |
127 | ||
146e4b3c MS |
128 | #define pmd_pgtable(pmd) \ |
129 | (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) | |
1da177e4 LT |
130 | |
131 | /* | |
132 | * page table entry allocation/free routines. | |
133 | */ | |
527e30b4 MS |
134 | #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) |
135 | #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) | |
146e4b3c MS |
136 | |
137 | #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) | |
138 | #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) | |
1da177e4 | 139 | |
80217147 MS |
140 | extern void rcu_table_freelist_finish(void); |
141 | ||
1da177e4 | 142 | #endif /* _S390_PGALLOC_H */ |