Merge commit 'v2.6.27-rc7' into x86/microcode
[pandora-kernel.git] / arch / powerpc / include / asm / pgalloc-64.h
1 #ifndef _ASM_POWERPC_PGALLOC_64_H
2 #define _ASM_POWERPC_PGALLOC_64_H
3 /*
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version
7  * 2 of the License, or (at your option) any later version.
8  */
9
10 #include <linux/mm.h>
11 #include <linux/slab.h>
12 #include <linux/cpumask.h>
13 #include <linux/percpu.h>
14
15 #ifndef CONFIG_PPC_SUBPAGE_PROT
16 static inline void subpage_prot_free(pgd_t *pgd) {}
17 #endif
18
19 extern struct kmem_cache *pgtable_cache[];
20
21 #define PGD_CACHE_NUM           0
22 #define PUD_CACHE_NUM           1
23 #define PMD_CACHE_NUM           1
24 #define HUGEPTE_CACHE_NUM       2
25 #define PTE_NONCACHE_NUM        7  /* from GFP rather than kmem_cache */
26
27 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
28 {
29         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
30 }
31
32 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
33 {
34         subpage_prot_free(pgd);
35         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
36 }
37
38 #ifndef CONFIG_PPC_64K_PAGES
39
40 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
41
42 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
43 {
44         return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
45                                 GFP_KERNEL|__GFP_REPEAT);
46 }
47
48 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
49 {
50         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
51 }
52
53 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
54 {
55         pud_set(pud, (unsigned long)pmd);
56 }
57
58 #define pmd_populate(mm, pmd, pte_page) \
59         pmd_populate_kernel(mm, pmd, page_address(pte_page))
60 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
61 #define pmd_pgtable(pmd) pmd_page(pmd)
62
63
64 #else /* CONFIG_PPC_64K_PAGES */
65
66 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
67
68 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
69                                        pte_t *pte)
70 {
71         pmd_set(pmd, (unsigned long)pte);
72 }
73
74 #define pmd_populate(mm, pmd, pte_page) \
75         pmd_populate_kernel(mm, pmd, page_address(pte_page))
76 #define pmd_pgtable(pmd) pmd_page(pmd)
77
78 #endif /* CONFIG_PPC_64K_PAGES */
79
80 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
81 {
82         return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
83                                 GFP_KERNEL|__GFP_REPEAT);
84 }
85
86 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
87 {
88         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
89 }
90
91 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
92                                           unsigned long address)
93 {
94         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
95 }
96
97 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
98                                         unsigned long address)
99 {
100         struct page *page;
101         pte_t *pte;
102
103         pte = pte_alloc_one_kernel(mm, address);
104         if (!pte)
105                 return NULL;
106         page = virt_to_page(pte);
107         pgtable_page_ctor(page);
108         return page;
109 }
110
111 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
112 {
113         free_page((unsigned long)pte);
114 }
115
116 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
117 {
118         pgtable_page_dtor(ptepage);
119         __free_page(ptepage);
120 }
121
122 #define PGF_CACHENUM_MASK       0x7
123
124 typedef struct pgtable_free {
125         unsigned long val;
126 } pgtable_free_t;
127
128 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
129                                                 unsigned long mask)
130 {
131         BUG_ON(cachenum > PGF_CACHENUM_MASK);
132
133         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
134 }
135
136 static inline void pgtable_free(pgtable_free_t pgf)
137 {
138         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
139         int cachenum = pgf.val & PGF_CACHENUM_MASK;
140
141         if (cachenum == PTE_NONCACHE_NUM)
142                 free_page((unsigned long)p);
143         else
144                 kmem_cache_free(pgtable_cache[cachenum], p);
145 }
146
147 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
148
149 #define __pte_free_tlb(tlb,ptepage)     \
150 do { \
151         pgtable_page_dtor(ptepage); \
152         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
153                 PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1)); \
154 } while (0)
155 #define __pmd_free_tlb(tlb, pmd)        \
156         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
157                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
158 #ifndef CONFIG_PPC_64K_PAGES
159 #define __pud_free_tlb(tlb, pud)        \
160         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
161                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
162 #endif /* CONFIG_PPC_64K_PAGES */
163
164 #define check_pgt_cache()       do { } while (0)
165
166 #endif /* _ASM_POWERPC_PGALLOC_64_H */