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(unsigned long *);
25 unsigned long *page_table_alloc(int);
26 void page_table_free(unsigned long *);
28 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
34 " mvc 8(248,%0),0(%0)\n"
36 " mvc 4(252,%0),0(%0)\n"
38 "0: mvc 256(256,%0),0(%0)\n"
41 : "+a" (s), "+d" (n));
44 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
46 clear_table(crst, entry, sizeof(unsigned long)*2048);
47 crst = get_shadow_table(crst);
49 clear_table(crst, entry, sizeof(unsigned long)*2048);
54 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
56 return _SEGMENT_ENTRY_EMPTY;
59 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
60 #define pud_free(x) do { } while (0)
62 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
63 #define pmd_free(x) do { } while (0)
65 #define pgd_populate(mm, pgd, pud) BUG()
66 #define pgd_populate_kernel(mm, pgd, pud) BUG()
68 #define pud_populate(mm, pud, pmd) BUG()
69 #define pud_populate_kernel(mm, pud, pmd) BUG()
73 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
75 return _REGION3_ENTRY_EMPTY;
78 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
79 #define pud_free(x) do { } while (0)
81 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
83 unsigned long *crst = crst_table_alloc(mm, s390_noexec);
85 crst_table_init(crst, _SEGMENT_ENTRY_EMPTY);
86 return (pmd_t *) crst;
88 #define pmd_free(pmd) crst_table_free((unsigned long *) pmd)
90 #define pgd_populate(mm, pgd, pud) BUG()
91 #define pgd_populate_kernel(mm, pgd, pud) BUG()
93 static inline void pud_populate_kernel(struct mm_struct *mm,
94 pud_t *pud, pmd_t *pmd)
96 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
99 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
101 pud_t *shadow_pud = get_shadow_table(pud);
102 pmd_t *shadow_pmd = get_shadow_table(pmd);
104 if (shadow_pud && shadow_pmd)
105 pud_populate_kernel(mm, shadow_pud, shadow_pmd);
106 pud_populate_kernel(mm, pud, pmd);
109 #endif /* __s390x__ */
111 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
113 unsigned long *crst = crst_table_alloc(mm, s390_noexec);
115 crst_table_init(crst, pgd_entry_type(mm));
116 return (pgd_t *) crst;
118 #define pgd_free(pgd) crst_table_free((unsigned long *) pgd)
121 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
124 pmd_val(pmd[0]) = _SEGMENT_ENTRY + __pa(pte);
125 pmd_val(pmd[1]) = _SEGMENT_ENTRY + __pa(pte+256);
126 pmd_val(pmd[2]) = _SEGMENT_ENTRY + __pa(pte+512);
127 pmd_val(pmd[3]) = _SEGMENT_ENTRY + __pa(pte+768);
128 #else /* __s390x__ */
129 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
130 pmd_val1(*pmd) = _SEGMENT_ENTRY + __pa(pte+256);
131 #endif /* __s390x__ */
135 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
137 pte_t *pte = (pte_t *)page_to_phys(page);
138 pmd_t *shadow_pmd = get_shadow_table(pmd);
139 pte_t *shadow_pte = get_shadow_pte(pte);
141 pmd_populate_kernel(mm, pmd, pte);
142 if (shadow_pmd && shadow_pte)
143 pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
147 * page table entry allocation/free routines.
149 #define pte_alloc_one_kernel(mm, vmaddr) \
150 ((pte_t *) page_table_alloc(s390_noexec))
151 #define pte_alloc_one(mm, vmaddr) \
152 virt_to_page(page_table_alloc(s390_noexec))
154 #define pte_free_kernel(pte) \
155 page_table_free((unsigned long *) pte)
156 #define pte_free(pte) \
157 page_table_free((unsigned long *) page_to_phys((struct page *) pte))
159 #endif /* _S390_PGALLOC_H */