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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 *, unsigned long);
22void page_table_free(struct mm_struct *, unsigned long *);
23void page_table_free_rcu(struct mmu_gather *, unsigned long *);
24
25void page_table_reset_pgste(struct mm_struct *, unsigned long, unsigned long,
26 bool init_skey);
27int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
28 unsigned long key, bool nq);
29
30static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
31{
32 typedef struct { char _[n]; } addrtype;
33
34 *s = val;
35 n = (n / 256) - 1;
36 asm volatile(
37#ifdef CONFIG_64BIT
38 " mvc 8(248,%0),0(%0)\n"
39#else
40 " mvc 4(252,%0),0(%0)\n"
41#endif
42 "0: mvc 256(256,%0),0(%0)\n"
43 " la %0,256(%0)\n"
44 " brct %1,0b\n"
45 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
46 : "m" (*(addrtype *) s));
47}
48
49static inline void crst_table_init(unsigned long *crst, unsigned long entry)
50{
51 clear_table(crst, entry, sizeof(unsigned long)*2048);
52}
53
54#ifndef CONFIG_64BIT
55
56static inline unsigned long pgd_entry_type(struct mm_struct *mm)
57{
58 return _SEGMENT_ENTRY_EMPTY;
59}
60
61#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
62#define pud_free(mm, x) do { } while (0)
63
64#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
65#define pmd_free(mm, x) do { } while (0)
66
67#define pgd_populate(mm, pgd, pud) BUG()
68#define pud_populate(mm, pud, pmd) BUG()
69
70#else /* CONFIG_64BIT */
71
72static inline unsigned long pgd_entry_type(struct mm_struct *mm)
73{
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;
78 return _REGION2_ENTRY_EMPTY;
79}
80
81int crst_table_upgrade(struct mm_struct *, unsigned long limit);
82void crst_table_downgrade(struct mm_struct *, unsigned long limit);
83
84static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
85{
86 unsigned long *table = crst_table_alloc(mm);
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)
92
93static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
94{
95 unsigned long *table = crst_table_alloc(mm);
96
97 if (!table)
98 return NULL;
99 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
100 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
101 crst_table_free(mm, table);
102 return NULL;
103 }
104 return (pmd_t *) table;
105}
106
107static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
108{
109 pgtable_pmd_page_dtor(virt_to_page(pmd));
110 crst_table_free(mm, (unsigned long *) pmd);
111}
112
113static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
114{
115 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
116}
117
118static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
119{
120 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
121}
122
123#endif /* CONFIG_64BIT */
124
125static inline pgd_t *pgd_alloc(struct mm_struct *mm)
126{
127 spin_lock_init(&mm->context.list_lock);
128 INIT_LIST_HEAD(&mm->context.pgtable_list);
129 INIT_LIST_HEAD(&mm->context.gmap_list);
130 return (pgd_t *) crst_table_alloc(mm);
131}
132#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
133
134static inline void pmd_populate(struct mm_struct *mm,
135 pmd_t *pmd, pgtable_t pte)
136{
137 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
138}
139
140#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
141
142#define pmd_pgtable(pmd) \
143 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
144
145/*
146 * page table entry allocation/free routines.
147 */
148#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
149#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
150
151#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
152#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
153
154extern void rcu_table_freelist_finish(void);
155
156#endif /* _S390_PGALLOC_H */