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1da177e4 LT |
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 */ |