2 * include/asm-s390/pgalloc.h
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
9 * Derived from "include/asm-i386/pgalloc.h"
10 * Copyright (C) 1994 Linus Torvalds
13 #ifndef _S390_PGALLOC_H
14 #define _S390_PGALLOC_H
16 #include <linux/threads.h>
17 #include <linux/gfp.h>
20 #define check_pgt_cache() do {} while (0)
22 unsigned long *crst_table_alloc(struct mm_struct *);
23 void crst_table_free(struct mm_struct *, unsigned long *);
24 void crst_table_free_rcu(struct mm_struct *, unsigned long *);
26 unsigned long *page_table_alloc(struct mm_struct *);
27 void page_table_free(struct mm_struct *, unsigned long *);
28 void page_table_free_rcu(struct mm_struct *, unsigned long *);
30 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
32 typedef struct { char _[n]; } addrtype;
38 " mvc 8(248,%0),0(%0)\n"
40 " mvc 4(252,%0),0(%0)\n"
42 "0: mvc 256(256,%0),0(%0)\n"
45 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
46 : "m" (*(addrtype *) s));
49 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
51 clear_table(crst, entry, sizeof(unsigned long)*2048);
56 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
58 return _SEGMENT_ENTRY_EMPTY;
61 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
62 #define pud_free(mm, x) do { } while (0)
64 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
65 #define pmd_free(mm, x) do { } while (0)
67 #define pgd_populate(mm, pgd, pud) BUG()
68 #define pgd_populate_kernel(mm, pgd, pud) BUG()
70 #define pud_populate(mm, pud, pmd) BUG()
71 #define pud_populate_kernel(mm, pud, pmd) BUG()
75 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
77 if (mm->context.asce_limit <= (1UL << 31))
78 return _SEGMENT_ENTRY_EMPTY;
79 if (mm->context.asce_limit <= (1UL << 42))
80 return _REGION3_ENTRY_EMPTY;
81 return _REGION2_ENTRY_EMPTY;
84 int crst_table_upgrade(struct mm_struct *, unsigned long limit);
85 void crst_table_downgrade(struct mm_struct *, unsigned long limit);
87 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
89 unsigned long *table = crst_table_alloc(mm);
91 crst_table_init(table, _REGION3_ENTRY_EMPTY);
92 return (pud_t *) table;
94 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
96 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
98 unsigned long *table = crst_table_alloc(mm);
100 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
101 return (pmd_t *) table;
103 #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
105 static inline void pgd_populate_kernel(struct mm_struct *mm,
106 pgd_t *pgd, pud_t *pud)
108 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
111 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
113 pgd_populate_kernel(mm, pgd, pud);
116 static inline void pud_populate_kernel(struct mm_struct *mm,
117 pud_t *pud, pmd_t *pmd)
119 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
122 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
124 pud_populate_kernel(mm, pud, pmd);
127 #endif /* __s390x__ */
129 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
131 spin_lock_init(&mm->context.list_lock);
132 INIT_LIST_HEAD(&mm->context.pgtable_list);
133 return (pgd_t *) crst_table_alloc(mm);
135 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
137 static inline void pmd_populate_kernel(struct mm_struct *mm,
138 pmd_t *pmd, pte_t *pte)
140 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
143 static inline void pmd_populate(struct mm_struct *mm,
144 pmd_t *pmd, pgtable_t pte)
146 pmd_populate_kernel(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 #endif /* _S390_PGALLOC_H */