1 #ifndef _ASM_SCORE_PGTABLE_H
2 #define _ASM_SCORE_PGTABLE_H
3
4 #include <linux/const.h>
5 #include <asm-generic/pgtable-nopmd.h>
6
7 #include <asm/fixmap.h>
8 #include <asm/setup.h>
9 #include <asm/pgtable-bits.h>
10
11 extern void load_pgd(unsigned long pg_dir);
12 extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
13
14 /* PGDIR_SHIFT determines what a third-level page table entry can map */
15 #define PGDIR_SHIFT 22
16 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
17 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
18
19 /*
20 * Entries per page directory level: we use two-level, so
21 * we don't really have any PUD/PMD directory physically.
22 */
23 #define PGD_ORDER 0
24 #define PTE_ORDER 0
25
26 #define PTRS_PER_PGD 1024
27 #define PTRS_PER_PTE 1024
28
29 #define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
30 #define FIRST_USER_ADDRESS 0UL
31
32 #define VMALLOC_START (0xc0000000UL)
33
34 #define PKMAP_BASE (0xfd000000UL)
35
36 #define VMALLOC_END (FIXADDR_START - 2*PAGE_SIZE)
37
38 #define pte_ERROR(e) \
39 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
40 __FILE__, __LINE__, pte_val(e))
41 #define pgd_ERROR(e) \
42 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
43 __FILE__, __LINE__, pgd_val(e))
44
45 /*
46 * Empty pgd/pmd entries point to the invalid_pte_table.
47 */
48 static inline int pmd_none(pmd_t pmd)
49 {
50 return pmd_val(pmd) == (unsigned long) invalid_pte_table;
51 }
52
53 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
54
55 static inline int pmd_present(pmd_t pmd)
56 {
57 return pmd_val(pmd) != (unsigned long) invalid_pte_table;
58 }
59
60 static inline void pmd_clear(pmd_t *pmdp)
61 {
62 pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
63 }
64
65 #define pte_page(x) pfn_to_page(pte_pfn(x))
66 #define pte_pfn(x) ((unsigned long)((x).pte >> PAGE_SHIFT))
67 #define pfn_pte(pfn, prot) \
68 __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
69
70 #define __pgd_offset(address) pgd_index(address)
71 #define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
72 #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
73
74 /* to find an entry in a kernel page-table-directory */
75 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
76 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
77
78 /* to find an entry in a page-table-directory */
79 #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
80
81 /* Find an entry in the third-level page table.. */
82 #define __pte_offset(address) \
83 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
84 #define pte_offset(dir, address) \
85 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
86 #define pte_offset_kernel(dir, address) \
87 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
88
89 #define pte_offset_map(dir, address) \
90 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
91 #define pte_unmap(pte) ((void)(pte))
92
93 #define __pte_to_swp_entry(pte) \
94 ((swp_entry_t) { pte_val(pte)})
95 #define __swp_entry_to_pte(x) ((pte_t) {(x).val})
96
97 #define pmd_phys(pmd) __pa((void *)pmd_val(pmd))
98 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
99 #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
100 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
101
102 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
103 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
104 #define pte_clear(mm, addr, xp) \
105 do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
106
107 /*
108 * The "pgd_xxx()" functions here are trivial for a folded two-level
109 * setup: the pgd is never bad, and a pmd always exists (as it's folded
110 * into the pgd entry)
111 */
112 #define pgd_present(pgd) (1)
113 #define pgd_none(pgd) (0)
114 #define pgd_bad(pgd) (0)
115 #define pgd_clear(pgdp) do { } while (0)
116
117 #define kern_addr_valid(addr) (1)
118 #define pmd_page_vaddr(pmd) pmd_val(pmd)
119
120 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
121 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
122
123 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
124 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
125 _PAGE_CACHE)
126 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
127 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
128 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
129 _PAGE_GLOBAL | _PAGE_CACHE)
130 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
131 __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
132
133 #define __P000 PAGE_NONE
134 #define __P001 PAGE_READONLY
135 #define __P010 PAGE_COPY
136 #define __P011 PAGE_COPY
137 #define __P100 PAGE_READONLY
138 #define __P101 PAGE_READONLY
139 #define __P110 PAGE_COPY
140 #define __P111 PAGE_COPY
141
142 #define __S000 PAGE_NONE
143 #define __S001 PAGE_READONLY
144 #define __S010 PAGE_SHARED
145 #define __S011 PAGE_SHARED
146 #define __S100 PAGE_READONLY
147 #define __S101 PAGE_READONLY
148 #define __S110 PAGE_SHARED
149 #define __S111 PAGE_SHARED
150
151 #define pgprot_noncached pgprot_noncached
152
153 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
154 {
155 unsigned long prot = pgprot_val(_prot);
156
157 prot = (prot & ~_CACHE_MASK);
158
159 return __pgprot(prot);
160 }
161
162 #define __swp_type(x) ((x).val & 0x1f)
163 #define __swp_offset(x) ((x).val >> 10)
164 #define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 10)})
165
166 extern unsigned long empty_zero_page;
167 extern unsigned long zero_page_mask;
168
169 #define ZERO_PAGE(vaddr) \
170 (virt_to_page((void *)(empty_zero_page + \
171 (((unsigned long)(vaddr)) & zero_page_mask))))
172
173 #define pgtable_cache_init() do {} while (0)
174
175 #define arch_enter_lazy_cpu_mode() do {} while (0)
176
177 static inline int pte_write(pte_t pte)
178 {
179 return pte_val(pte) & _PAGE_WRITE;
180 }
181
182 static inline int pte_dirty(pte_t pte)
183 {
184 return pte_val(pte) & _PAGE_MODIFIED;
185 }
186
187 static inline int pte_young(pte_t pte)
188 {
189 return pte_val(pte) & _PAGE_ACCESSED;
190 }
191
192 #define pte_special(pte) (0)
193
194 static inline pte_t pte_wrprotect(pte_t pte)
195 {
196 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
197 return pte;
198 }
199
200 static inline pte_t pte_mkclean(pte_t pte)
201 {
202 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
203 return pte;
204 }
205
206 static inline pte_t pte_mkold(pte_t pte)
207 {
208 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
209 return pte;
210 }
211
212 static inline pte_t pte_mkwrite(pte_t pte)
213 {
214 pte_val(pte) |= _PAGE_WRITE;
215 if (pte_val(pte) & _PAGE_MODIFIED)
216 pte_val(pte) |= _PAGE_SILENT_WRITE;
217 return pte;
218 }
219
220 static inline pte_t pte_mkdirty(pte_t pte)
221 {
222 pte_val(pte) |= _PAGE_MODIFIED;
223 if (pte_val(pte) & _PAGE_WRITE)
224 pte_val(pte) |= _PAGE_SILENT_WRITE;
225 return pte;
226 }
227
228 static inline pte_t pte_mkyoung(pte_t pte)
229 {
230 pte_val(pte) |= _PAGE_ACCESSED;
231 if (pte_val(pte) & _PAGE_READ)
232 pte_val(pte) |= _PAGE_SILENT_READ;
233 return pte;
234 }
235
236 #define set_pmd(pmdptr, pmdval) \
237 do { *(pmdptr) = (pmdval); } while (0)
238 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
239
240 extern unsigned long pgd_current;
241 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
242 extern void paging_init(void);
243
244 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
245 {
246 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
247 }
248
249 extern void __update_tlb(struct vm_area_struct *vma,
250 unsigned long address, pte_t pte);
251 extern void __update_cache(struct vm_area_struct *vma,
252 unsigned long address, pte_t pte);
253
254 static inline void update_mmu_cache(struct vm_area_struct *vma,
255 unsigned long address, pte_t *ptep)
256 {
257 pte_t pte = *ptep;
258 __update_tlb(vma, address, pte);
259 __update_cache(vma, address, pte);
260 }
261
262 #ifndef __ASSEMBLY__
263 #include <asm-generic/pgtable.h>
264
265 void setup_memory(void);
266 #endif /* __ASSEMBLY__ */
267
268 #endif /* _ASM_SCORE_PGTABLE_H */
269
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