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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
22unsigned long *crst_table_alloc(struct mm_struct *, int);
23void crst_table_free(struct mm_struct *, unsigned long *);
24
25unsigned long *page_table_alloc(struct mm_struct *);
26void page_table_free(struct mm_struct *, unsigned long *);
27void disable_noexec(struct mm_struct *, struct task_struct *);
28
29static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
30{
31 *s = val;
32 n = (n / 256) - 1;
33 asm volatile(
34#ifdef CONFIG_64BIT
35 " mvc 8(248,%0),0(%0)\n"
36#else
37 " mvc 4(252,%0),0(%0)\n"
38#endif
39 "0: mvc 256(256,%0),0(%0)\n"
40 " la %0,256(%0)\n"
41 " brct %1,0b\n"
42 : "+a" (s), "+d" (n));
43}
44
45static inline void crst_table_init(unsigned long *crst, unsigned long entry)
46{
47 clear_table(crst, entry, sizeof(unsigned long)*2048);
48 crst = get_shadow_table(crst);
49 if (crst)
50 clear_table(crst, entry, sizeof(unsigned long)*2048);
51}
52
53#ifndef __s390x__
54
55static inline unsigned long pgd_entry_type(struct mm_struct *mm)
56{
57 return _SEGMENT_ENTRY_EMPTY;
58}
59
60#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
61#define pud_free(mm, x) do { } while (0)
62
63#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
64#define pmd_free(mm, x) do { } while (0)
65
66#define pgd_populate(mm, pgd, pud) BUG()
67#define pgd_populate_kernel(mm, pgd, pud) BUG()
68
69#define pud_populate(mm, pud, pmd) BUG()
70#define pud_populate_kernel(mm, pud, pmd) BUG()
71
72#else /* __s390x__ */
73
74static inline unsigned long pgd_entry_type(struct mm_struct *mm)
75{
76 if (mm->context.asce_limit <= (1UL << 31))
77 return _SEGMENT_ENTRY_EMPTY;
78 if (mm->context.asce_limit <= (1UL << 42))
79 return _REGION3_ENTRY_EMPTY;
80 return _REGION2_ENTRY_EMPTY;
81}
82
83int crst_table_upgrade(struct mm_struct *, unsigned long limit);
84void crst_table_downgrade(struct mm_struct *, unsigned long limit);
85
86static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
87{
88 unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
89 if (table)
90 crst_table_init(table, _REGION3_ENTRY_EMPTY);
91 return (pud_t *) table;
92}
93#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
94
95static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
96{
97 unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
98 if (table)
99 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
100 return (pmd_t *) table;
101}
102#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
103
104static inline void pgd_populate_kernel(struct mm_struct *mm,
105 pgd_t *pgd, pud_t *pud)
106{
107 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
108}
109
110static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
111{
112 pgd_populate_kernel(mm, pgd, pud);
113 if (mm->context.noexec) {
114 pgd = get_shadow_table(pgd);
115 pud = get_shadow_table(pud);
116 pgd_populate_kernel(mm, pgd, pud);
117 }
118}
119
120static inline void pud_populate_kernel(struct mm_struct *mm,
121 pud_t *pud, pmd_t *pmd)
122{
123 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
124}
125
126static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
127{
128 pud_populate_kernel(mm, pud, pmd);
129 if (mm->context.noexec) {
130 pud = get_shadow_table(pud);
131 pmd = get_shadow_table(pmd);
132 pud_populate_kernel(mm, pud, pmd);
133 }
134}
135
136#endif /* __s390x__ */
137
138static inline pgd_t *pgd_alloc(struct mm_struct *mm)
139{
140 INIT_LIST_HEAD(&mm->context.crst_list);
141 INIT_LIST_HEAD(&mm->context.pgtable_list);
142 return (pgd_t *) crst_table_alloc(mm, s390_noexec);
143}
144#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
145
146static inline void pmd_populate_kernel(struct mm_struct *mm,
147 pmd_t *pmd, pte_t *pte)
148{
149 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
150}
151
152static inline void pmd_populate(struct mm_struct *mm,
153 pmd_t *pmd, pgtable_t pte)
154{
155 pmd_populate_kernel(mm, pmd, pte);
156 if (mm->context.noexec) {
157 pmd = get_shadow_table(pmd);
158 pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
159 }
160}
161
162#define pmd_pgtable(pmd) \
163 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
164
165/*
166 * page table entry allocation/free routines.
167 */
168#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
169#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
170
171#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
172#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
173
174#endif /* _S390_PGALLOC_H */