2 * include/asm-s390/pgalloc.h
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
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 *, int);
23 void crst_table_free(struct mm_struct *, unsigned long *);
25 unsigned long *page_table_alloc(struct mm_struct *);
26 void page_table_free(struct mm_struct *, unsigned long *);
27 void disable_noexec(struct mm_struct *, struct task_struct *);
29 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
35 " mvc 8(248,%0),0(%0)\n"
37 " mvc 4(252,%0),0(%0)\n"
39 "0: mvc 256(256,%0),0(%0)\n"
42 : "+a" (s), "+d" (n));
45 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
47 clear_table(crst, entry, sizeof(unsigned long)*2048);
48 crst = get_shadow_table(crst);
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 pgd_populate_kernel(mm, pgd, pud) BUG()
69 #define pud_populate(mm, pud, pmd) BUG()
70 #define pud_populate_kernel(mm, pud, pmd) BUG()
74 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
76 return _REGION3_ENTRY_EMPTY;
79 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
80 #define pud_free(mm, x) do { } while (0)
82 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
84 unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
86 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
87 return (pmd_t *) table;
89 #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
91 #define pgd_populate(mm, pgd, pud) BUG()
92 #define pgd_populate_kernel(mm, pgd, pud) BUG()
94 static inline void pud_populate_kernel(struct mm_struct *mm,
95 pud_t *pud, pmd_t *pmd)
97 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
100 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
102 pud_populate_kernel(mm, pud, pmd);
103 if (mm->context.noexec) {
104 pud = get_shadow_table(pud);
105 pmd = get_shadow_table(pmd);
106 pud_populate_kernel(mm, pud, pmd);
110 #endif /* __s390x__ */
112 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
116 INIT_LIST_HEAD(&mm->context.crst_list);
117 INIT_LIST_HEAD(&mm->context.pgtable_list);
118 crst = crst_table_alloc(mm, s390_noexec);
120 crst_table_init(crst, pgd_entry_type(mm));
121 return (pgd_t *) crst;
123 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
125 static inline void pmd_populate_kernel(struct mm_struct *mm,
126 pmd_t *pmd, pte_t *pte)
128 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
131 static inline void pmd_populate(struct mm_struct *mm,
132 pmd_t *pmd, pgtable_t pte)
134 pmd_populate_kernel(mm, pmd, pte);
135 if (mm->context.noexec) {
136 pmd = get_shadow_table(pmd);
137 pmd_populate_kernel(mm, pmd, pte + PTRS_PER_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))
148 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
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 #endif /* _S390_PGALLOC_H */