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 void page_table_free(struct mm_struct *, unsigned long *);
23 void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
25 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
26 unsigned long key, bool nq);
27 unsigned long get_guest_storage_key(struct mm_struct *mm, unsigned long addr);
29 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
31 typedef struct { char _[n]; } addrtype;
36 " mvc 8(248,%0),0(%0)\n"
37 "0: mvc 256(256,%0),0(%0)\n"
40 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
41 : "m" (*(addrtype *) s));
44 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
46 clear_table(crst, entry, sizeof(unsigned long)*2048);
49 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
51 if (mm->context.asce_limit <= (1UL << 31))
52 return _SEGMENT_ENTRY_EMPTY;
53 if (mm->context.asce_limit <= (1UL << 42))
54 return _REGION3_ENTRY_EMPTY;
55 return _REGION2_ENTRY_EMPTY;
58 int crst_table_upgrade(struct mm_struct *, unsigned long limit);
59 void crst_table_downgrade(struct mm_struct *, unsigned long limit);
61 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
63 unsigned long *table = crst_table_alloc(mm);
65 crst_table_init(table, _REGION3_ENTRY_EMPTY);
66 return (pud_t *) table;
68 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
70 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
72 unsigned long *table = crst_table_alloc(mm);
76 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
77 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
78 crst_table_free(mm, table);
81 return (pmd_t *) table;
84 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
86 pgtable_pmd_page_dtor(virt_to_page(pmd));
87 crst_table_free(mm, (unsigned long *) pmd);
90 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
92 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
95 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
97 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
100 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
102 spin_lock_init(&mm->context.list_lock);
103 INIT_LIST_HEAD(&mm->context.pgtable_list);
104 INIT_LIST_HEAD(&mm->context.gmap_list);
105 return (pgd_t *) crst_table_alloc(mm);
107 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
109 static inline void pmd_populate(struct mm_struct *mm,
110 pmd_t *pmd, pgtable_t pte)
112 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
115 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
117 #define pmd_pgtable(pmd) \
118 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
121 * page table entry allocation/free routines.
123 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
124 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
126 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
127 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
129 extern void rcu_table_freelist_finish(void);
131 #endif /* _S390_PGALLOC_H */