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 pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
60 #define pmd_free(x) do { } while (0)
62 #define pgd_populate(mm, pmd, pte) BUG()
63 #define pgd_populate_kernel(mm, pmd, pte) BUG()
67 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
69 return _REGION3_ENTRY_EMPTY;
72 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
74 unsigned long *crst = crst_table_alloc(mm, s390_noexec);
76 crst_table_init(crst, _SEGMENT_ENTRY_EMPTY);
77 return (pmd_t *) crst;
79 #define pmd_free(pmd) crst_table_free((unsigned long *) pmd)
81 static inline void pgd_populate_kernel(struct mm_struct *mm,
82 pgd_t *pgd, pmd_t *pmd)
84 pgd_val(*pgd) = _REGION3_ENTRY | __pa(pmd);
87 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
89 pgd_t *shadow_pgd = get_shadow_table(pgd);
90 pmd_t *shadow_pmd = get_shadow_table(pmd);
92 if (shadow_pgd && shadow_pmd)
93 pgd_populate_kernel(mm, shadow_pgd, shadow_pmd);
94 pgd_populate_kernel(mm, pgd, pmd);
97 #endif /* __s390x__ */
99 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
101 unsigned long *crst = crst_table_alloc(mm, s390_noexec);
103 crst_table_init(crst, pgd_entry_type(mm));
104 return (pgd_t *) crst;
106 #define pgd_free(pgd) crst_table_free((unsigned long *) pgd)
109 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
112 pmd_val(pmd[0]) = _SEGMENT_ENTRY + __pa(pte);
113 pmd_val(pmd[1]) = _SEGMENT_ENTRY + __pa(pte+256);
114 pmd_val(pmd[2]) = _SEGMENT_ENTRY + __pa(pte+512);
115 pmd_val(pmd[3]) = _SEGMENT_ENTRY + __pa(pte+768);
116 #else /* __s390x__ */
117 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
118 pmd_val1(*pmd) = _SEGMENT_ENTRY + __pa(pte+256);
119 #endif /* __s390x__ */
123 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
125 pte_t *pte = (pte_t *)page_to_phys(page);
126 pmd_t *shadow_pmd = get_shadow_table(pmd);
127 pte_t *shadow_pte = get_shadow_pte(pte);
129 pmd_populate_kernel(mm, pmd, pte);
130 if (shadow_pmd && shadow_pte)
131 pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
135 * page table entry allocation/free routines.
137 #define pte_alloc_one_kernel(mm, vmaddr) \
138 ((pte_t *) page_table_alloc(s390_noexec))
139 #define pte_alloc_one(mm, vmaddr) \
140 virt_to_page(page_table_alloc(s390_noexec))
142 #define pte_free_kernel(pte) \
143 page_table_free((unsigned long *) pte)
144 #define pte_free(pte) \
145 page_table_free((unsigned long *) page_to_phys((struct page *) pte))
147 #endif /* _S390_PGALLOC_H */