3 * Copyright IBM Corp. 1999, 2000
4 * Author(s): Hartmut Penner (hp@de.ibm.com)
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 * Derived from "include/asm-i386/pgalloc.h"
8 * Copyright (C) 1994 Linus Torvalds
11 #ifndef _S390_PGALLOC_H
12 #define _S390_PGALLOC_H
14 #include <linux/threads.h>
15 #include <linux/gfp.h>
18 unsigned long *crst_table_alloc(struct mm_struct *);
19 void crst_table_free(struct mm_struct *, unsigned long *);
21 unsigned long *page_table_alloc(struct mm_struct *);
22 struct page *page_table_alloc_pgste(struct mm_struct *mm);
23 void page_table_free(struct mm_struct *, unsigned long *);
24 void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
25 void page_table_free_pgste(struct page *page);
26 extern int page_table_allocate_pgste;
28 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
30 struct addrtype { char _[256]; };
33 for (i = 0; i < n; i += 256) {
36 "mvc 8(248,%[s]),0(%[s])\n"
37 : "+m" (*(struct addrtype *) s)
39 s += 256 / sizeof(long);
43 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
45 clear_table(crst, entry, sizeof(unsigned long)*2048);
48 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
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 if (mm->context.asce_limit <= (1UL << 53))
55 return _REGION2_ENTRY_EMPTY;
56 return _REGION1_ENTRY_EMPTY;
59 int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
60 void crst_table_downgrade(struct mm_struct *);
62 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
64 unsigned long *table = crst_table_alloc(mm);
67 crst_table_init(table, _REGION2_ENTRY_EMPTY);
68 return (p4d_t *) table;
70 #define p4d_free(mm, p4d) crst_table_free(mm, (unsigned long *) p4d)
72 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
74 unsigned long *table = crst_table_alloc(mm);
76 crst_table_init(table, _REGION3_ENTRY_EMPTY);
77 return (pud_t *) table;
79 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
81 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
83 unsigned long *table = crst_table_alloc(mm);
87 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
88 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
89 crst_table_free(mm, table);
92 return (pmd_t *) table;
95 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
97 pgtable_pmd_page_dtor(virt_to_page(pmd));
98 crst_table_free(mm, (unsigned long *) pmd);
101 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
103 pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d);
106 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
108 p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud);
111 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
113 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
116 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
118 unsigned long *table = crst_table_alloc(mm);
122 if (mm->context.asce_limit == (1UL << 31)) {
123 /* Forking a compat process with 2 page table levels */
124 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
125 crst_table_free(mm, table);
129 return (pgd_t *) table;
132 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
134 if (mm->context.asce_limit == (1UL << 31))
135 pgtable_pmd_page_dtor(virt_to_page(pgd));
136 crst_table_free(mm, (unsigned long *) pgd);
139 static inline void pmd_populate(struct mm_struct *mm,
140 pmd_t *pmd, pgtable_t pte)
142 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
145 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
147 #define pmd_pgtable(pmd) \
148 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
151 * page table entry allocation/free routines.
153 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
154 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
156 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
157 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
159 extern void rcu_table_freelist_finish(void);
161 #endif /* _S390_PGALLOC_H */