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Linux/arch/score/include/asm/pgtable.h

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  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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