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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 0
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 /*
94  * Bits 9(_PAGE_PRESENT) and 10(_PAGE_FILE)are taken,
95  * split up 30 bits of offset into this range:
96  */
97 #define PTE_FILE_MAX_BITS 30
98 #define pte_to_pgoff(_pte) \
99  (((_pte).pte & 0x1ff) | (((_pte).pte >> 11) << 9))
100 #define pgoff_to_pte(off) \
101  ((pte_t) {((off) & 0x1ff) | (((off) >> 9) << 11) | _PAGE_FILE})
102 #define __pte_to_swp_entry(pte) \
103  ((swp_entry_t) { pte_val(pte)})
104 #define __swp_entry_to_pte(x) ((pte_t) {(x).val})
105 
106 #define pmd_phys(pmd) __pa((void *)pmd_val(pmd))
107 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
108 #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
109 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
110 
111 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
112 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
113 #define pte_clear(mm, addr, xp) \
114  do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
115 
116 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
117  remap_pfn_range(vma, vaddr, pfn, size, prot)
118 
119 /*
120  * The "pgd_xxx()" functions here are trivial for a folded two-level
121  * setup: the pgd is never bad, and a pmd always exists (as it's folded
122  * into the pgd entry)
123  */
124 #define pgd_present(pgd) (1)
125 #define pgd_none(pgd) (0)
126 #define pgd_bad(pgd) (0)
127 #define pgd_clear(pgdp) do { } while (0)
128 
129 #define kern_addr_valid(addr) (1)
130 #define pmd_page_vaddr(pmd) pmd_val(pmd)
131 
132 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
133 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
134 
135 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
136 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
137  _PAGE_CACHE)
138 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
139 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
140 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
141  _PAGE_GLOBAL | _PAGE_CACHE)
142 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
143  __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
144 
145 #define __P000 PAGE_NONE
146 #define __P001 PAGE_READONLY
147 #define __P010 PAGE_COPY
148 #define __P011 PAGE_COPY
149 #define __P100 PAGE_READONLY
150 #define __P101 PAGE_READONLY
151 #define __P110 PAGE_COPY
152 #define __P111 PAGE_COPY
153 
154 #define __S000 PAGE_NONE
155 #define __S001 PAGE_READONLY
156 #define __S010 PAGE_SHARED
157 #define __S011 PAGE_SHARED
158 #define __S100 PAGE_READONLY
159 #define __S101 PAGE_READONLY
160 #define __S110 PAGE_SHARED
161 #define __S111 PAGE_SHARED
162 
163 #define pgprot_noncached pgprot_noncached
164 
165 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
166 {
167  unsigned long prot = pgprot_val(_prot);
168 
169  prot = (prot & ~_CACHE_MASK);
170 
171  return __pgprot(prot);
172 }
173 
174 #define __swp_type(x) ((x).val & 0x1f)
175 #define __swp_offset(x) ((x).val >> 11)
176 #define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 11)})
177 
178 extern unsigned long empty_zero_page;
179 extern unsigned long zero_page_mask;
180 
181 #define ZERO_PAGE(vaddr) \
182  (virt_to_page((void *)(empty_zero_page + \
183  (((unsigned long)(vaddr)) & zero_page_mask))))
184 
185 #define pgtable_cache_init() do {} while (0)
186 
187 #define arch_enter_lazy_cpu_mode() do {} while (0)
188 
189 static inline int pte_write(pte_t pte)
190 {
191  return pte_val(pte) & _PAGE_WRITE;
192 }
193 
194 static inline int pte_dirty(pte_t pte)
195 {
196  return pte_val(pte) & _PAGE_MODIFIED;
197 }
198 
199 static inline int pte_young(pte_t pte)
200 {
201  return pte_val(pte) & _PAGE_ACCESSED;
202 }
203 
204 static inline int pte_file(pte_t pte)
205 {
206  return pte_val(pte) & _PAGE_FILE;
207 }
208 
209 #define pte_special(pte) (0)
210 
211 static inline pte_t pte_wrprotect(pte_t pte)
212 {
213  pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
214  return pte;
215 }
216 
217 static inline pte_t pte_mkclean(pte_t pte)
218 {
219  pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
220  return pte;
221 }
222 
223 static inline pte_t pte_mkold(pte_t pte)
224 {
225  pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
226  return pte;
227 }
228 
229 static inline pte_t pte_mkwrite(pte_t pte)
230 {
231  pte_val(pte) |= _PAGE_WRITE;
232  if (pte_val(pte) & _PAGE_MODIFIED)
233  pte_val(pte) |= _PAGE_SILENT_WRITE;
234  return pte;
235 }
236 
237 static inline pte_t pte_mkdirty(pte_t pte)
238 {
239  pte_val(pte) |= _PAGE_MODIFIED;
240  if (pte_val(pte) & _PAGE_WRITE)
241  pte_val(pte) |= _PAGE_SILENT_WRITE;
242  return pte;
243 }
244 
245 static inline pte_t pte_mkyoung(pte_t pte)
246 {
247  pte_val(pte) |= _PAGE_ACCESSED;
248  if (pte_val(pte) & _PAGE_READ)
249  pte_val(pte) |= _PAGE_SILENT_READ;
250  return pte;
251 }
252 
253 #define set_pmd(pmdptr, pmdval) \
254  do { *(pmdptr) = (pmdval); } while (0)
255 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
256 
257 extern unsigned long pgd_current;
258 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
259 extern void paging_init(void);
260 
261 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
262 {
263  return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
264 }
265 
266 extern void __update_tlb(struct vm_area_struct *vma,
267  unsigned long address, pte_t pte);
268 extern void __update_cache(struct vm_area_struct *vma,
269  unsigned long address, pte_t pte);
270 
271 static inline void update_mmu_cache(struct vm_area_struct *vma,
272  unsigned long address, pte_t *ptep)
273 {
274  pte_t pte = *ptep;
275  __update_tlb(vma, address, pte);
276  __update_cache(vma, address, pte);
277 }
278 
279 #ifndef __ASSEMBLY__
280 #include <asm-generic/pgtable.h>
281 
282 void setup_memory(void);
283 #endif /* __ASSEMBLY__ */
284 
285 #endif /* _ASM_SCORE_PGTABLE_H */
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