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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 *, unsigned long);
22void page_table_free(struct mm_struct *, unsigned long *);
23void page_table_free_rcu(struct mmu_gather *, unsigned long *);
24
25int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
26 unsigned long key, bool nq);
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#ifdef CONFIG_64BIT
36 " mvc 8(248,%0),0(%0)\n"
37#else
38 " mvc 4(252,%0),0(%0)\n"
39#endif
40 "0: mvc 256(256,%0),0(%0)\n"
41 " la %0,256(%0)\n"
42 " brct %1,0b\n"
43 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
44 : "m" (*(addrtype *) s));
45}
46
47static inline void crst_table_init(unsigned long *crst, unsigned long entry)
48{
49 clear_table(crst, entry, sizeof(unsigned long)*2048);
50}
51
52#ifndef CONFIG_64BIT
53
54static inline unsigned long pgd_entry_type(struct mm_struct *mm)
55{
56 return _SEGMENT_ENTRY_EMPTY;
57}
58
59#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
60#define pud_free(mm, x) do { } while (0)
61
62#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
63#define pmd_free(mm, x) do { } while (0)
64
65#define pgd_populate(mm, pgd, pud) BUG()
66#define pud_populate(mm, pud, pmd) BUG()
67
68#else /* CONFIG_64BIT */
69
70static inline unsigned long pgd_entry_type(struct mm_struct *mm)
71{
72 if (mm->context.asce_limit <= (1UL << 31))
73 return _SEGMENT_ENTRY_EMPTY;
74 if (mm->context.asce_limit <= (1UL << 42))
75 return _REGION3_ENTRY_EMPTY;
76 return _REGION2_ENTRY_EMPTY;
77}
78
79int crst_table_upgrade(struct mm_struct *, unsigned long limit);
80void crst_table_downgrade(struct mm_struct *, unsigned long limit);
81
82static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
83{
84 unsigned long *table = crst_table_alloc(mm);
85 if (table)
86 crst_table_init(table, _REGION3_ENTRY_EMPTY);
87 return (pud_t *) table;
88}
89#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
90
91static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
92{
93 unsigned long *table = crst_table_alloc(mm);
94 if (table)
95 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
96 return (pmd_t *) table;
97}
98#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
99
100static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
101{
102 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
103}
104
105static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
106{
107 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
108}
109
110#endif /* CONFIG_64BIT */
111
112static inline pgd_t *pgd_alloc(struct mm_struct *mm)
113{
114 spin_lock_init(&mm->context.list_lock);
115 INIT_LIST_HEAD(&mm->context.pgtable_list);
116 INIT_LIST_HEAD(&mm->context.gmap_list);
117 return (pgd_t *) crst_table_alloc(mm);
118}
119#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
120
121static inline void pmd_populate(struct mm_struct *mm,
122 pmd_t *pmd, pgtable_t pte)
123{
124 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
125}
126
127#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
128
129#define pmd_pgtable(pmd) \
130 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
131
132/*
133 * page table entry allocation/free routines.
134 */
135#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
136#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
137
138#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
139#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
140
141extern void rcu_table_freelist_finish(void);
142
143#endif /* _S390_PGALLOC_H */