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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 *);
22void page_table_free(struct mm_struct *, unsigned long *);
23void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
24extern int page_table_allocate_pgste;
25
26static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
27{
28 typedef struct { char _[n]; } addrtype;
29
30 *s = val;
31 n = (n / 256) - 1;
32 asm volatile(
33 " mvc 8(248,%0),0(%0)\n"
34 "0: mvc 256(256,%0),0(%0)\n"
35 " la %0,256(%0)\n"
36 " brct %1,0b\n"
37 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
38 : "m" (*(addrtype *) s));
39}
40
41static inline void crst_table_init(unsigned long *crst, unsigned long entry)
42{
43 clear_table(crst, entry, sizeof(unsigned long)*2048);
44}
45
46static inline unsigned long pgd_entry_type(struct mm_struct *mm)
47{
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;
52 return _REGION2_ENTRY_EMPTY;
53}
54
55int crst_table_upgrade(struct mm_struct *);
56void crst_table_downgrade(struct mm_struct *);
57
58static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
59{
60 unsigned long *table = crst_table_alloc(mm);
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)
66
67static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
68{
69 unsigned long *table = crst_table_alloc(mm);
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 }
78 return (pmd_t *) table;
79}
80
81static 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}
86
87static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
88{
89 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
90}
91
92static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
93{
94 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
95}
96
97static inline pgd_t *pgd_alloc(struct mm_struct *mm)
98{
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
113static 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);
118}
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))
135#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
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 */