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11#ifndef _ASM_MICROBLAZE_PGALLOC_H
12#define _ASM_MICROBLAZE_PGALLOC_H
13
14#ifdef CONFIG_MMU
15
16#include <linux/kernel.h>
17#include <linux/highmem.h>
18#include <asm/setup.h>
19#include <asm/io.h>
20#include <asm/page.h>
21#include <asm/cache.h>
22
23#define PGDIR_ORDER 0
24
25
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28
29
30
31extern struct pgtable_cache_struct {
32 unsigned long *pgd_cache;
33 unsigned long *pte_cache;
34 unsigned long pgtable_cache_sz;
35} quicklists;
36
37#define pgd_quicklist (quicklists.pgd_cache)
38#define pmd_quicklist ((unsigned long *)0)
39#define pte_quicklist (quicklists.pte_cache)
40#define pgtable_cache_size (quicklists.pgtable_cache_sz)
41
42extern unsigned long *zero_cache;
43extern atomic_t zero_sz;
44extern atomic_t zeropage_hits;
45extern atomic_t zeropage_calls;
46extern atomic_t zerototal;
47
48#define zero_quicklist (zero_cache)
49#define zero_cache_sz (zero_sz)
50#define zero_cache_calls (zeropage_calls)
51#define zero_cache_hits (zeropage_hits)
52#define zero_cache_total (zerototal)
53
54
55
56
57
58extern unsigned long get_zero_page_fast(void);
59
60extern void __bad_pte(pmd_t *pmd);
61
62extern inline pgd_t *get_pgd_slow(void)
63{
64 pgd_t *ret;
65
66 ret = (pgd_t *)__get_free_pages(GFP_KERNEL, PGDIR_ORDER);
67 if (ret != NULL)
68 clear_page(ret);
69 return ret;
70}
71
72extern inline pgd_t *get_pgd_fast(void)
73{
74 unsigned long *ret;
75
76 ret = pgd_quicklist;
77 if (ret != NULL) {
78 pgd_quicklist = (unsigned long *)(*ret);
79 ret[0] = 0;
80 pgtable_cache_size--;
81 } else
82 ret = (unsigned long *)get_pgd_slow();
83 return (pgd_t *)ret;
84}
85
86extern inline void free_pgd_fast(pgd_t *pgd)
87{
88 *(unsigned long **)pgd = pgd_quicklist;
89 pgd_quicklist = (unsigned long *) pgd;
90 pgtable_cache_size++;
91}
92
93extern inline void free_pgd_slow(pgd_t *pgd)
94{
95 free_page((unsigned long)pgd);
96}
97
98#define pgd_free(mm, pgd) free_pgd_fast(pgd)
99#define pgd_alloc(mm) get_pgd_fast()
100
101#define pmd_pgtable(pmd) pmd_page(pmd)
102
103
104
105
106
107#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
108#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
109
110#define pmd_free(mm, x) do { } while (0)
111#define pgd_populate(mm, pmd, pte) BUG()
112
113static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
114 unsigned long address)
115{
116 pte_t *pte;
117 extern int mem_init_done;
118 extern void *early_get_page(void);
119 if (mem_init_done) {
120 pte = (pte_t *)__get_free_page(GFP_KERNEL |
121 __GFP_REPEAT | __GFP_ZERO);
122 } else {
123 pte = (pte_t *)early_get_page();
124 if (pte)
125 clear_page(pte);
126 }
127 return pte;
128}
129
130static inline struct page *pte_alloc_one(struct mm_struct *mm,
131 unsigned long address)
132{
133 struct page *ptepage;
134
135#ifdef CONFIG_HIGHPTE
136 int flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT;
137#else
138 int flags = GFP_KERNEL | __GFP_REPEAT;
139#endif
140
141 ptepage = alloc_pages(flags, 0);
142 if (ptepage)
143 clear_highpage(ptepage);
144 return ptepage;
145}
146
147static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm,
148 unsigned long address)
149{
150 unsigned long *ret;
151
152 ret = pte_quicklist;
153 if (ret != NULL) {
154 pte_quicklist = (unsigned long *)(*ret);
155 ret[0] = 0;
156 pgtable_cache_size--;
157 }
158 return (pte_t *)ret;
159}
160
161extern inline void pte_free_fast(pte_t *pte)
162{
163 *(unsigned long **)pte = pte_quicklist;
164 pte_quicklist = (unsigned long *) pte;
165 pgtable_cache_size++;
166}
167
168extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
169{
170 free_page((unsigned long)pte);
171}
172
173extern inline void pte_free_slow(struct page *ptepage)
174{
175 __free_page(ptepage);
176}
177
178extern inline void pte_free(struct mm_struct *mm, struct page *ptepage)
179{
180 __free_page(ptepage);
181}
182
183#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, (pte))
184
185#define pmd_populate(mm, pmd, pte) (pmd_val(*(pmd)) = page_address(pte))
186
187#define pmd_populate_kernel(mm, pmd, pte) \
188 (pmd_val(*(pmd)) = (unsigned long) (pte))
189
190
191
192
193
194#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
195
196#define __pmd_free_tlb(tlb, x, addr) do { } while (0)
197#define pgd_populate(mm, pmd, pte) BUG()
198
199extern int do_check_pgt_cache(int, int);
200
201#endif
202
203#define check_pgt_cache() do {} while (0)
204
205#endif
206