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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);
24
25int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
26 unsigned long key, bool nq);
27unsigned long get_guest_storage_key(struct mm_struct *mm, unsigned long addr);
28
29static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
30{
31 typedef struct { char _[n]; } addrtype;
32
33 *s = val;
34 n = (n / 256) - 1;
35 asm volatile(
36#ifdef CONFIG_64BIT
37 " mvc 8(248,%0),0(%0)\n"
38#else
39 " mvc 4(252,%0),0(%0)\n"
40#endif
41 "0: mvc 256(256,%0),0(%0)\n"
42 " la %0,256(%0)\n"
43 " brct %1,0b\n"
44 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
45 : "m" (*(addrtype *) s));
46}
47
48static inline void crst_table_init(unsigned long *crst, unsigned long entry)
49{
50 clear_table(crst, entry, sizeof(unsigned long)*2048);
51}
52
53#ifndef CONFIG_64BIT
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 pud_populate(mm, pud, pmd) BUG()
68
69#else /* CONFIG_64BIT */
70
71static inline unsigned long pgd_entry_type(struct mm_struct *mm)
72{
73 if (mm->context.asce_limit <= (1UL << 31))
74 return _SEGMENT_ENTRY_EMPTY;
75 if (mm->context.asce_limit <= (1UL << 42))
76 return _REGION3_ENTRY_EMPTY;
77 return _REGION2_ENTRY_EMPTY;
78}
79
80int crst_table_upgrade(struct mm_struct *, unsigned long limit);
81void crst_table_downgrade(struct mm_struct *, unsigned long limit);
82
83static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
84{
85 unsigned long *table = crst_table_alloc(mm);
86 if (table)
87 crst_table_init(table, _REGION3_ENTRY_EMPTY);
88 return (pud_t *) table;
89}
90#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
91
92static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
93{
94 unsigned long *table = crst_table_alloc(mm);
95
96 if (!table)
97 return NULL;
98 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
99 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
100 crst_table_free(mm, table);
101 return NULL;
102 }
103 return (pmd_t *) table;
104}
105
106static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
107{
108 pgtable_pmd_page_dtor(virt_to_page(pmd));
109 crst_table_free(mm, (unsigned long *) pmd);
110}
111
112static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
113{
114 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
115}
116
117static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
118{
119 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
120}
121
122#endif /* CONFIG_64BIT */
123
124static inline pgd_t *pgd_alloc(struct mm_struct *mm)
125{
126 spin_lock_init(&mm->context.list_lock);
127 INIT_LIST_HEAD(&mm->context.pgtable_list);
128 INIT_LIST_HEAD(&mm->context.gmap_list);
129 return (pgd_t *) crst_table_alloc(mm);
130}
131#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
132
133static inline void pmd_populate(struct mm_struct *mm,
134 pmd_t *pmd, pgtable_t pte)
135{
136 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
137}
138
139#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
140
141#define pmd_pgtable(pmd) \
142 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
143
144/*
145 * page table entry allocation/free routines.
146 */
147#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
148#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
149
150#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
151#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
152
153extern void rcu_table_freelist_finish(void);
154
155#endif /* _S390_PGALLOC_H */