3 * Copyright IBM Corp. 1999, 2000
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 *, unsigned long);
22 void page_table_free(struct mm_struct *, unsigned long *);
23 void page_table_free_rcu(struct mmu_gather *, unsigned long *);
25 void page_table_reset_pgste(struct mm_struct *, unsigned long, unsigned long);
26 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
27 unsigned long key, bool nq);
29 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
31 typedef struct { char _[n]; } addrtype;
37 " mvc 8(248,%0),0(%0)\n"
39 " mvc 4(252,%0),0(%0)\n"
41 "0: mvc 256(256,%0),0(%0)\n"
44 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
45 : "m" (*(addrtype *) s));
48 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
50 clear_table(crst, entry, sizeof(unsigned long)*2048);
55 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
57 return _SEGMENT_ENTRY_EMPTY;
60 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
61 #define pud_free(mm, x) do { } while (0)
63 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
64 #define pmd_free(mm, x) do { } while (0)
66 #define pgd_populate(mm, pgd, pud) BUG()
67 #define pud_populate(mm, pud, pmd) BUG()
69 #else /* CONFIG_64BIT */
71 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
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;
80 int crst_table_upgrade(struct mm_struct *, unsigned long limit);
81 void crst_table_downgrade(struct mm_struct *, unsigned long limit);
83 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
85 unsigned long *table = crst_table_alloc(mm);
87 crst_table_init(table, _REGION3_ENTRY_EMPTY);
88 return (pud_t *) table;
90 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
92 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
94 unsigned long *table = crst_table_alloc(mm);
98 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
99 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
100 crst_table_free(mm, table);
103 return (pmd_t *) table;
106 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
108 pgtable_pmd_page_dtor(virt_to_page(pmd));
109 crst_table_free(mm, (unsigned long *) pmd);
112 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
114 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
117 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
119 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
122 #endif /* CONFIG_64BIT */
124 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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);
131 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
133 static inline void pmd_populate(struct mm_struct *mm,
134 pmd_t *pmd, pgtable_t pte)
136 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
139 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
141 #define pmd_pgtable(pmd) \
142 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
145 * page table entry allocation/free routines.
147 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
148 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
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)
153 extern void rcu_table_freelist_finish(void);
155 #endif /* _S390_PGALLOC_H */