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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
20unsigned long *crst_table_alloc(struct mm_struct *);
21void crst_table_free(struct mm_struct *, unsigned long *);
22
23unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
24void page_table_free(struct mm_struct *, unsigned long *);
25void page_table_free_rcu(struct mmu_gather *, unsigned long *);
26
27static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
28{
29 typedef struct { char _[n]; } addrtype;
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), "=m" (*(addrtype *) s)
43 : "m" (*(addrtype *) s));
44}
45
46static inline void crst_table_init(unsigned long *crst, unsigned long entry)
47{
48 clear_table(crst, entry, sizeof(unsigned long)*2048);
49}
50
51#ifndef CONFIG_64BIT
52
53static inline unsigned long pgd_entry_type(struct mm_struct *mm)
54{
55 return _SEGMENT_ENTRY_EMPTY;
56}
57
58#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
59#define pud_free(mm, x) do { } while (0)
60
61#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
62#define pmd_free(mm, x) do { } while (0)
63
64#define pgd_populate(mm, pgd, pud) BUG()
65#define pud_populate(mm, pud, pmd) BUG()
66
67#else /* CONFIG_64BIT */
68
69static inline unsigned long pgd_entry_type(struct mm_struct *mm)
70{
71 if (mm->context.asce_limit <= (1UL << 31))
72 return _SEGMENT_ENTRY_EMPTY;
73 if (mm->context.asce_limit <= (1UL << 42))
74 return _REGION3_ENTRY_EMPTY;
75 return _REGION2_ENTRY_EMPTY;
76}
77
78int crst_table_upgrade(struct mm_struct *, unsigned long limit);
79void crst_table_downgrade(struct mm_struct *, unsigned long limit);
80
81static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
82{
83 unsigned long *table = crst_table_alloc(mm);
84 if (table)
85 crst_table_init(table, _REGION3_ENTRY_EMPTY);
86 return (pud_t *) table;
87}
88#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
89
90static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
91{
92 unsigned long *table = crst_table_alloc(mm);
93 if (table)
94 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
95 return (pmd_t *) table;
96}
97#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
98
99static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
100{
101 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
102}
103
104static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
105{
106 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
107}
108
109#endif /* CONFIG_64BIT */
110
111static inline pgd_t *pgd_alloc(struct mm_struct *mm)
112{
113 spin_lock_init(&mm->context.list_lock);
114 INIT_LIST_HEAD(&mm->context.pgtable_list);
115 INIT_LIST_HEAD(&mm->context.gmap_list);
116 return (pgd_t *) crst_table_alloc(mm);
117}
118#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
119
120static inline void pmd_populate(struct mm_struct *mm,
121 pmd_t *pmd, pgtable_t pte)
122{
123 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
124}
125
126#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
127
128#define pmd_pgtable(pmd) \
129 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
130
131/*
132 * page table entry allocation/free routines.
133 */
134#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
135#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
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)
139
140extern void rcu_table_freelist_finish(void);
141
142#endif /* _S390_PGALLOC_H */
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2000
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
14#include <linux/threads.h>
15#include <linux/gfp.h>
16#include <linux/mm.h>
17
18unsigned long *crst_table_alloc(struct mm_struct *);
19void crst_table_free(struct mm_struct *, unsigned long *);
20
21unsigned long *page_table_alloc(struct mm_struct *);
22struct page *page_table_alloc_pgste(struct mm_struct *mm);
23void page_table_free(struct mm_struct *, unsigned long *);
24void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
25void page_table_free_pgste(struct page *page);
26extern int page_table_allocate_pgste;
27
28static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
29{
30 struct addrtype { char _[256]; };
31 int i;
32
33 for (i = 0; i < n; i += 256) {
34 *s = val;
35 asm volatile(
36 "mvc 8(248,%[s]),0(%[s])\n"
37 : "+m" (*(struct addrtype *) s)
38 : [s] "a" (s));
39 s += 256 / sizeof(long);
40 }
41}
42
43static inline void crst_table_init(unsigned long *crst, unsigned long entry)
44{
45 clear_table(crst, entry, sizeof(unsigned long)*2048);
46}
47
48static inline unsigned long pgd_entry_type(struct mm_struct *mm)
49{
50 if (mm->context.asce_limit <= (1UL << 31))
51 return _SEGMENT_ENTRY_EMPTY;
52 if (mm->context.asce_limit <= (1UL << 42))
53 return _REGION3_ENTRY_EMPTY;
54 return _REGION2_ENTRY_EMPTY;
55}
56
57int crst_table_upgrade(struct mm_struct *);
58void crst_table_downgrade(struct mm_struct *);
59
60static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
61{
62 unsigned long *table = crst_table_alloc(mm);
63 if (table)
64 crst_table_init(table, _REGION3_ENTRY_EMPTY);
65 return (pud_t *) table;
66}
67#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
68
69static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
70{
71 unsigned long *table = crst_table_alloc(mm);
72
73 if (!table)
74 return NULL;
75 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
76 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
77 crst_table_free(mm, table);
78 return NULL;
79 }
80 return (pmd_t *) table;
81}
82
83static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
84{
85 pgtable_pmd_page_dtor(virt_to_page(pmd));
86 crst_table_free(mm, (unsigned long *) pmd);
87}
88
89static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
90{
91 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
92}
93
94static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
95{
96 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
97}
98
99static inline pgd_t *pgd_alloc(struct mm_struct *mm)
100{
101 unsigned long *table = crst_table_alloc(mm);
102
103 if (!table)
104 return NULL;
105 if (mm->context.asce_limit == (1UL << 31)) {
106 /* Forking a compat process with 2 page table levels */
107 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
108 crst_table_free(mm, table);
109 return NULL;
110 }
111 }
112 return (pgd_t *) table;
113}
114
115static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
116{
117 if (mm->context.asce_limit == (1UL << 31))
118 pgtable_pmd_page_dtor(virt_to_page(pgd));
119 crst_table_free(mm, (unsigned long *) pgd);
120}
121
122static inline void pmd_populate(struct mm_struct *mm,
123 pmd_t *pmd, pgtable_t pte)
124{
125 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
126}
127
128#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
129
130#define pmd_pgtable(pmd) \
131 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
132
133/*
134 * page table entry allocation/free routines.
135 */
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)
141
142extern void rcu_table_freelist_finish(void);
143
144#endif /* _S390_PGALLOC_H */