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
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
22 unsigned long *crst_table_alloc(struct mm_struct *, int);
23 void crst_table_free(struct mm_struct *, unsigned long *);
24 void crst_table_free_rcu(struct mm_struct *, unsigned long *);
25
26 unsigned long *page_table_alloc(struct mm_struct *);
27 void page_table_free(struct mm_struct *, unsigned long *);
28 void page_table_free_rcu(struct mm_struct *, unsigned long *);
29 void disable_noexec(struct mm_struct *, struct task_struct *);
30
clear_table(unsigned long * s,unsigned long val,size_t n)31 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
32 {
33 typedef struct { char _[n]; } addrtype;
34
35 *s = val;
36 n = (n / 256) - 1;
37 asm volatile(
38 #ifdef CONFIG_64BIT
39 " mvc 8(248,%0),0(%0)\n"
40 #else
41 " mvc 4(252,%0),0(%0)\n"
42 #endif
43 "0: mvc 256(256,%0),0(%0)\n"
44 " la %0,256(%0)\n"
45 " brct %1,0b\n"
46 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
47 : "m" (*(addrtype *) s));
48 }
49
crst_table_init(unsigned long * crst,unsigned long entry)50 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
51 {
52 clear_table(crst, entry, sizeof(unsigned long)*2048);
53 crst = get_shadow_table(crst);
54 if (crst)
55 clear_table(crst, entry, sizeof(unsigned long)*2048);
56 }
57
58 #ifndef __s390x__
59
pgd_entry_type(struct mm_struct * mm)60 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
61 {
62 return _SEGMENT_ENTRY_EMPTY;
63 }
64
65 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
66 #define pud_free(mm, x) do { } while (0)
67
68 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
69 #define pmd_free(mm, x) do { } while (0)
70
71 #define pgd_populate(mm, pgd, pud) BUG()
72 #define pgd_populate_kernel(mm, pgd, pud) BUG()
73
74 #define pud_populate(mm, pud, pmd) BUG()
75 #define pud_populate_kernel(mm, pud, pmd) BUG()
76
77 #else /* __s390x__ */
78
pgd_entry_type(struct mm_struct * mm)79 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
80 {
81 if (mm->context.asce_limit <= (1UL << 31))
82 return _SEGMENT_ENTRY_EMPTY;
83 if (mm->context.asce_limit <= (1UL << 42))
84 return _REGION3_ENTRY_EMPTY;
85 return _REGION2_ENTRY_EMPTY;
86 }
87
88 int crst_table_upgrade(struct mm_struct *, unsigned long limit);
89 void crst_table_downgrade(struct mm_struct *, unsigned long limit);
90
pud_alloc_one(struct mm_struct * mm,unsigned long address)91 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
92 {
93 unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
94 if (table)
95 crst_table_init(table, _REGION3_ENTRY_EMPTY);
96 return (pud_t *) table;
97 }
98 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
99
pmd_alloc_one(struct mm_struct * mm,unsigned long vmaddr)100 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
101 {
102 unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
103 if (table)
104 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
105 return (pmd_t *) table;
106 }
107 #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
108
pgd_populate_kernel(struct mm_struct * mm,pgd_t * pgd,pud_t * pud)109 static inline void pgd_populate_kernel(struct mm_struct *mm,
110 pgd_t *pgd, pud_t *pud)
111 {
112 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
113 }
114
pgd_populate(struct mm_struct * mm,pgd_t * pgd,pud_t * pud)115 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
116 {
117 pgd_populate_kernel(mm, pgd, pud);
118 if (mm->context.noexec) {
119 pgd = get_shadow_table(pgd);
120 pud = get_shadow_table(pud);
121 pgd_populate_kernel(mm, pgd, pud);
122 }
123 }
124
pud_populate_kernel(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)125 static inline void pud_populate_kernel(struct mm_struct *mm,
126 pud_t *pud, pmd_t *pmd)
127 {
128 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
129 }
130
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)131 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
132 {
133 pud_populate_kernel(mm, pud, pmd);
134 if (mm->context.noexec) {
135 pud = get_shadow_table(pud);
136 pmd = get_shadow_table(pmd);
137 pud_populate_kernel(mm, pud, pmd);
138 }
139 }
140
141 #endif /* __s390x__ */
142
pgd_alloc(struct mm_struct * mm)143 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
144 {
145 spin_lock_init(&mm->context.list_lock);
146 INIT_LIST_HEAD(&mm->context.crst_list);
147 INIT_LIST_HEAD(&mm->context.pgtable_list);
148 return (pgd_t *)
149 crst_table_alloc(mm, user_mode == SECONDARY_SPACE_MODE);
150 }
151 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
152
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)153 static inline void pmd_populate_kernel(struct mm_struct *mm,
154 pmd_t *pmd, pte_t *pte)
155 {
156 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
157 }
158
pmd_populate(struct mm_struct * mm,pmd_t * pmd,pgtable_t pte)159 static inline void pmd_populate(struct mm_struct *mm,
160 pmd_t *pmd, pgtable_t pte)
161 {
162 pmd_populate_kernel(mm, pmd, pte);
163 if (mm->context.noexec) {
164 pmd = get_shadow_table(pmd);
165 pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
166 }
167 }
168
169 #define pmd_pgtable(pmd) \
170 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
171
172 /*
173 * page table entry allocation/free routines.
174 */
175 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
176 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
177
178 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
179 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
180
181 extern void rcu_table_freelist_finish(void);
182
183 #endif /* _S390_PGALLOC_H */
184