diff options
Diffstat (limited to 'include/asm-s390/pgalloc.h')
-rw-r--r-- | include/asm-s390/pgalloc.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/include/asm-s390/pgalloc.h b/include/asm-s390/pgalloc.h new file mode 100644 index 000000000000..3417dd71ab43 --- /dev/null +++ b/include/asm-s390/pgalloc.h | |||
@@ -0,0 +1,168 @@ | |||
1 | /* | ||
2 | * include/asm-s390/pgalloc.h | ||
3 | * | ||
4 | * S390 version | ||
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) | ||
8 | * | ||
9 | * Derived from "include/asm-i386/pgalloc.h" | ||
10 | * Copyright (C) 1994 Linus Torvalds | ||
11 | */ | ||
12 | |||
13 | #ifndef _S390_PGALLOC_H | ||
14 | #define _S390_PGALLOC_H | ||
15 | |||
16 | #include <linux/config.h> | ||
17 | #include <linux/threads.h> | ||
18 | #include <linux/gfp.h> | ||
19 | #include <linux/mm.h> | ||
20 | |||
21 | #define check_pgt_cache() do {} while (0) | ||
22 | |||
23 | extern void diag10(unsigned long addr); | ||
24 | |||
25 | /* | ||
26 | * Allocate and free page tables. The xxx_kernel() versions are | ||
27 | * used to allocate a kernel page table - this turns on ASN bits | ||
28 | * if any. | ||
29 | */ | ||
30 | |||
31 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) | ||
32 | { | ||
33 | pgd_t *pgd; | ||
34 | int i; | ||
35 | |||
36 | #ifndef __s390x__ | ||
37 | pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1); | ||
38 | if (pgd != NULL) | ||
39 | for (i = 0; i < USER_PTRS_PER_PGD; i++) | ||
40 | pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE)); | ||
41 | #else /* __s390x__ */ | ||
42 | pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2); | ||
43 | if (pgd != NULL) | ||
44 | for (i = 0; i < PTRS_PER_PGD; i++) | ||
45 | pgd_clear(pgd + i); | ||
46 | #endif /* __s390x__ */ | ||
47 | return pgd; | ||
48 | } | ||
49 | |||
50 | static inline void pgd_free(pgd_t *pgd) | ||
51 | { | ||
52 | #ifndef __s390x__ | ||
53 | free_pages((unsigned long) pgd, 1); | ||
54 | #else /* __s390x__ */ | ||
55 | free_pages((unsigned long) pgd, 2); | ||
56 | #endif /* __s390x__ */ | ||
57 | } | ||
58 | |||
59 | #ifndef __s390x__ | ||
60 | /* | ||
61 | * page middle directory allocation/free routines. | ||
62 | * We use pmd cache only on s390x, so these are dummy routines. This | ||
63 | * code never triggers because the pgd will always be present. | ||
64 | */ | ||
65 | #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) | ||
66 | #define pmd_free(x) do { } while (0) | ||
67 | #define __pmd_free_tlb(tlb,x) do { } while (0) | ||
68 | #define pgd_populate(mm, pmd, pte) BUG() | ||
69 | #else /* __s390x__ */ | ||
70 | static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) | ||
71 | { | ||
72 | pmd_t *pmd; | ||
73 | int i; | ||
74 | |||
75 | pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2); | ||
76 | if (pmd != NULL) { | ||
77 | for (i=0; i < PTRS_PER_PMD; i++) | ||
78 | pmd_clear(pmd+i); | ||
79 | } | ||
80 | return pmd; | ||
81 | } | ||
82 | |||
83 | static inline void pmd_free (pmd_t *pmd) | ||
84 | { | ||
85 | free_pages((unsigned long) pmd, 2); | ||
86 | } | ||
87 | |||
88 | #define __pmd_free_tlb(tlb,pmd) \ | ||
89 | do { \ | ||
90 | tlb_flush_mmu(tlb, 0, 0); \ | ||
91 | pmd_free(pmd); \ | ||
92 | } while (0) | ||
93 | |||
94 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd) | ||
95 | { | ||
96 | pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd); | ||
97 | } | ||
98 | |||
99 | #endif /* __s390x__ */ | ||
100 | |||
101 | static inline void | ||
102 | pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) | ||
103 | { | ||
104 | #ifndef __s390x__ | ||
105 | pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte); | ||
106 | pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256); | ||
107 | pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512); | ||
108 | pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768); | ||
109 | #else /* __s390x__ */ | ||
110 | pmd_val(*pmd) = _PMD_ENTRY + __pa(pte); | ||
111 | pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256); | ||
112 | #endif /* __s390x__ */ | ||
113 | } | ||
114 | |||
115 | static inline void | ||
116 | pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page) | ||
117 | { | ||
118 | pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT)); | ||
119 | } | ||
120 | |||
121 | /* | ||
122 | * page table entry allocation/free routines. | ||
123 | */ | ||
124 | static inline pte_t * | ||
125 | pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr) | ||
126 | { | ||
127 | pte_t *pte; | ||
128 | int i; | ||
129 | |||
130 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT); | ||
131 | if (pte != NULL) { | ||
132 | for (i=0; i < PTRS_PER_PTE; i++) { | ||
133 | pte_clear(mm, vmaddr, pte+i); | ||
134 | vmaddr += PAGE_SIZE; | ||
135 | } | ||
136 | } | ||
137 | return pte; | ||
138 | } | ||
139 | |||
140 | static inline struct page * | ||
141 | pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr) | ||
142 | { | ||
143 | pte_t *pte = pte_alloc_one_kernel(mm, vmaddr); | ||
144 | if (pte) | ||
145 | return virt_to_page(pte); | ||
146 | return 0; | ||
147 | } | ||
148 | |||
149 | static inline void pte_free_kernel(pte_t *pte) | ||
150 | { | ||
151 | free_page((unsigned long) pte); | ||
152 | } | ||
153 | |||
154 | static inline void pte_free(struct page *pte) | ||
155 | { | ||
156 | __free_page(pte); | ||
157 | } | ||
158 | |||
159 | #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte) | ||
160 | |||
161 | /* | ||
162 | * This establishes kernel virtual mappings (e.g., as a result of a | ||
163 | * vmalloc call). Since s390-esame uses a separate kernel page table, | ||
164 | * there is nothing to do here... :) | ||
165 | */ | ||
166 | #define set_pgdir(addr,entry) do { } while(0) | ||
167 | |||
168 | #endif /* _S390_PGALLOC_H */ | ||