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linux
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 typedef struct { char _[n]; } addrtype;
31
32 *s = val;
33 n = (n / 256) - 1;
34 asm volatile(
35 " mvc 8(248,%0),0(%0)\n"
36 "0: mvc 256(256,%0),0(%0)\n"
37 " la %0,256(%0)\n"
38 " brct %1,0b\n"
39 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
40 : "m" (*(addrtype *) s));
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 */