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 #define CRST_ALLOC_ORDER 2
20 unsigned long *crst_table_alloc(struct mm_struct *);
21 void crst_table_free(struct mm_struct *, unsigned long *);
23 unsigned long *page_table_alloc(struct mm_struct *);
24 struct page *page_table_alloc_pgste(struct mm_struct *mm);
25 void page_table_free(struct mm_struct *, unsigned long *);
26 void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
27 void page_table_free_pgste(struct page *page);
28 extern int page_table_allocate_pgste;
30 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
32 struct addrtype { char _[256]; };
35 for (i = 0; i < n; i += 256) {
38 "mvc 8(248,%[s]),0(%[s])\n"
39 : "+m" (*(struct addrtype *) s)
41 s += 256 / sizeof(long);
45 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
47 clear_table(crst, entry, _CRST_TABLE_SIZE);
50 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
52 if (mm->context.asce_limit <= _REGION3_SIZE)
53 return _SEGMENT_ENTRY_EMPTY;
54 if (mm->context.asce_limit <= _REGION2_SIZE)
55 return _REGION3_ENTRY_EMPTY;
56 if (mm->context.asce_limit <= _REGION1_SIZE)
57 return _REGION2_ENTRY_EMPTY;
58 return _REGION1_ENTRY_EMPTY;
61 int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
62 void crst_table_downgrade(struct mm_struct *);
64 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
66 unsigned long *table = crst_table_alloc(mm);
69 crst_table_init(table, _REGION2_ENTRY_EMPTY);
70 return (p4d_t *) table;
72 #define p4d_free(mm, p4d) crst_table_free(mm, (unsigned long *) p4d)
74 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
76 unsigned long *table = crst_table_alloc(mm);
78 crst_table_init(table, _REGION3_ENTRY_EMPTY);
79 return (pud_t *) table;
81 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
83 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
85 unsigned long *table = crst_table_alloc(mm);
89 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
90 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
91 crst_table_free(mm, table);
94 return (pmd_t *) table;
97 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
99 pgtable_pmd_page_dtor(virt_to_page(pmd));
100 crst_table_free(mm, (unsigned long *) pmd);
103 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
105 pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d);
108 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
110 p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud);
113 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
115 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
118 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
120 unsigned long *table = crst_table_alloc(mm);
124 if (mm->context.asce_limit == _REGION3_SIZE) {
125 /* Forking a compat process with 2 page table levels */
126 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
127 crst_table_free(mm, table);
131 return (pgd_t *) table;
134 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
136 if (mm->context.asce_limit == _REGION3_SIZE)
137 pgtable_pmd_page_dtor(virt_to_page(pgd));
138 crst_table_free(mm, (unsigned long *) pgd);
141 static inline void pmd_populate(struct mm_struct *mm,
142 pmd_t *pmd, pgtable_t pte)
144 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
147 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
149 #define pmd_pgtable(pmd) \
150 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
153 * page table entry allocation/free routines.
155 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
156 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
158 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
159 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
161 extern void rcu_table_freelist_finish(void);
163 void vmem_map_init(void);
164 void *vmem_crst_alloc(unsigned long val);
165 pte_t *vmem_pte_alloc(void);
167 #endif /* _S390_PGALLOC_H */