Linux kernel mirror (for testing)
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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/slab.h>
11#include <linux/cpumask.h>
12#include <linux/percpu.h>
13
14#ifndef CONFIG_PPC_SUBPAGE_PROT
15static inline void subpage_prot_free(pgd_t *pgd) {}
16#endif
17
18extern struct kmem_cache *pgtable_cache[];
19
20#define PGD_CACHE_NUM 0
21#define PUD_CACHE_NUM 1
22#define PMD_CACHE_NUM 1
23#define HUGEPTE_CACHE_NUM 2
24#define PTE_NONCACHE_NUM 7 /* from GFP rather than kmem_cache */
25
26static inline pgd_t *pgd_alloc(struct mm_struct *mm)
27{
28 return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
29}
30
31static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
32{
33 subpage_prot_free(pgd);
34 kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
35}
36
37#ifndef CONFIG_PPC_64K_PAGES
38
39#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD)
40
41static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
42{
43 return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
44 GFP_KERNEL|__GFP_REPEAT);
45}
46
47static inline void pud_free(struct mm_struct *mm, pud_t *pud)
48{
49 kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
50}
51
52static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
53{
54 pud_set(pud, (unsigned long)pmd);
55}
56
57#define pmd_populate(mm, pmd, pte_page) \
58 pmd_populate_kernel(mm, pmd, page_address(pte_page))
59#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
60#define pmd_pgtable(pmd) pmd_page(pmd)
61
62
63#else /* CONFIG_PPC_64K_PAGES */
64
65#define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
66
67static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
68 pte_t *pte)
69{
70 pmd_set(pmd, (unsigned long)pte);
71}
72
73#define pmd_populate(mm, pmd, pte_page) \
74 pmd_populate_kernel(mm, pmd, page_address(pte_page))
75#define pmd_pgtable(pmd) pmd_page(pmd)
76
77#endif /* CONFIG_PPC_64K_PAGES */
78
79static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
80{
81 return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
82 GFP_KERNEL|__GFP_REPEAT);
83}
84
85static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
86{
87 kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
88}
89
90static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
91 unsigned long address)
92{
93 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
94}
95
96static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
97 unsigned long address)
98{
99 struct page *page;
100 pte_t *pte;
101
102 pte = pte_alloc_one_kernel(mm, address);
103 if (!pte)
104 return NULL;
105 page = virt_to_page(pte);
106 pgtable_page_ctor(page);
107 return page;
108}
109
110static inline void pgtable_free(pgtable_free_t pgf)
111{
112 void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
113 int cachenum = pgf.val & PGF_CACHENUM_MASK;
114
115 if (cachenum == PTE_NONCACHE_NUM)
116 free_page((unsigned long)p);
117 else
118 kmem_cache_free(pgtable_cache[cachenum], p);
119}
120
121#define __pmd_free_tlb(tlb, pmd) \
122 pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
123 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
124#ifndef CONFIG_PPC_64K_PAGES
125#define __pud_free_tlb(tlb, pud) \
126 pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
127 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
128#endif /* CONFIG_PPC_64K_PAGES */
129
130#define check_pgt_cache() do { } while (0)
131
132#endif /* _ASM_POWERPC_PGALLOC_64_H */