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2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2003 Ralf Baechle
12 #include <asm/pgtable-32.h>
15 #include <asm/pgtable-64.h>
19 #include <asm/pgtable-bits.h>
22 struct vm_area_struct
;
24 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
25 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
26 PAGE_CACHABLE_DEFAULT)
27 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
28 PAGE_CACHABLE_DEFAULT)
29 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
30 PAGE_CACHABLE_DEFAULT)
31 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
32 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
33 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
34 PAGE_CACHABLE_DEFAULT)
35 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
39 * MIPS can't do page protection for execute, and considers that the same like
40 * read. Also, write permissions imply read permissions. This is the closest
41 * we can get by reasonable means..
43 #define __P000 PAGE_NONE
44 #define __P001 PAGE_READONLY
45 #define __P010 PAGE_COPY
46 #define __P011 PAGE_COPY
47 #define __P100 PAGE_READONLY
48 #define __P101 PAGE_READONLY
49 #define __P110 PAGE_COPY
50 #define __P111 PAGE_COPY
52 #define __S000 PAGE_NONE
53 #define __S001 PAGE_READONLY
54 #define __S010 PAGE_SHARED
55 #define __S011 PAGE_SHARED
56 #define __S100 PAGE_READONLY
57 #define __S101 PAGE_READONLY
58 #define __S110 PAGE_SHARED
59 #define __S111 PAGE_SHARED
62 * ZERO_PAGE is a global shared page that is always zero; used
63 * for zero-mapped memory areas etc..
66 extern unsigned long empty_zero_page
;
67 extern unsigned long zero_page_mask
;
69 #define ZERO_PAGE(vaddr) \
70 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
72 extern void paging_init(void);
75 * Conversion functions: convert a page and protection to a page entry,
76 * and a page entry and page directory to the page they refer to.
78 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
79 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
80 #define pmd_page_vaddr(pmd) pmd_val(pmd)
82 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
84 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
85 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
87 static inline void set_pte(pte_t
*ptep
, pte_t pte
)
89 ptep
->pte_high
= pte
.pte_high
;
91 ptep
->pte_low
= pte
.pte_low
;
92 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
94 if (pte
.pte_low
& _PAGE_GLOBAL
) {
95 pte_t
*buddy
= ptep_buddy(ptep
);
97 * Make sure the buddy is global too (if it's !none,
98 * it better already be global)
100 if (pte_none(*buddy
)) {
101 buddy
->pte_low
|= _PAGE_GLOBAL
;
102 buddy
->pte_high
|= _PAGE_GLOBAL
;
106 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
108 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
110 pte_t null
= __pte(0);
112 /* Preserve global status for the pair */
113 if (ptep_buddy(ptep
)->pte_low
& _PAGE_GLOBAL
)
114 null
.pte_low
= null
.pte_high
= _PAGE_GLOBAL
;
116 set_pte_at(mm
, addr
, ptep
, null
);
120 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
121 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
124 * Certain architectures need to do special things when pte's
125 * within a page table are directly modified. Thus, the following
126 * hook is made available.
128 static inline void set_pte(pte_t
*ptep
, pte_t pteval
)
131 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
132 if (pte_val(pteval
) & _PAGE_GLOBAL
) {
133 pte_t
*buddy
= ptep_buddy(ptep
);
135 * Make sure the buddy is global too (if it's !none,
136 * it better already be global)
138 if (pte_none(*buddy
))
139 pte_val(*buddy
) = pte_val(*buddy
) | _PAGE_GLOBAL
;
143 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
145 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
147 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
148 /* Preserve global status for the pair */
149 if (pte_val(*ptep_buddy(ptep
)) & _PAGE_GLOBAL
)
150 set_pte_at(mm
, addr
, ptep
, __pte(_PAGE_GLOBAL
));
153 set_pte_at(mm
, addr
, ptep
, __pte(0));
158 * (pmds are folded into puds so this doesn't get actually called,
159 * but the define is needed for a generic inline function.)
161 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
165 * (puds are folded into pgds so this doesn't get actually called,
166 * but the define is needed for a generic inline function.)
168 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
171 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
172 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
173 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
176 * We used to declare this array with size but gcc 3.3 and older are not able
177 * to find that this expression is a constant, so the size is dropped.
179 extern pgd_t swapper_pg_dir
[];
182 * The following only work if pte_present() is true.
183 * Undefined behaviour if not..
185 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
186 static inline int pte_write(pte_t pte
) { return pte
.pte_low
& _PAGE_WRITE
; }
187 static inline int pte_dirty(pte_t pte
) { return pte
.pte_low
& _PAGE_MODIFIED
; }
188 static inline int pte_young(pte_t pte
) { return pte
.pte_low
& _PAGE_ACCESSED
; }
189 static inline int pte_file(pte_t pte
) { return pte
.pte_low
& _PAGE_FILE
; }
191 static inline pte_t
pte_wrprotect(pte_t pte
)
193 pte
.pte_low
&= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
194 pte
.pte_high
&= ~_PAGE_SILENT_WRITE
;
198 static inline pte_t
pte_mkclean(pte_t pte
)
200 pte
.pte_low
&= ~(_PAGE_MODIFIED
| _PAGE_SILENT_WRITE
);
201 pte
.pte_high
&= ~_PAGE_SILENT_WRITE
;
205 static inline pte_t
pte_mkold(pte_t pte
)
207 pte
.pte_low
&= ~(_PAGE_ACCESSED
| _PAGE_SILENT_READ
);
208 pte
.pte_high
&= ~_PAGE_SILENT_READ
;
212 static inline pte_t
pte_mkwrite(pte_t pte
)
214 pte
.pte_low
|= _PAGE_WRITE
;
215 if (pte
.pte_low
& _PAGE_MODIFIED
) {
216 pte
.pte_low
|= _PAGE_SILENT_WRITE
;
217 pte
.pte_high
|= _PAGE_SILENT_WRITE
;
222 static inline pte_t
pte_mkdirty(pte_t pte
)
224 pte
.pte_low
|= _PAGE_MODIFIED
;
225 if (pte
.pte_low
& _PAGE_WRITE
) {
226 pte
.pte_low
|= _PAGE_SILENT_WRITE
;
227 pte
.pte_high
|= _PAGE_SILENT_WRITE
;
232 static inline pte_t
pte_mkyoung(pte_t pte
)
234 pte
.pte_low
|= _PAGE_ACCESSED
;
235 if (pte
.pte_low
& _PAGE_READ
)
236 pte
.pte_low
|= _PAGE_SILENT_READ
;
237 pte
.pte_high
|= _PAGE_SILENT_READ
;
241 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_WRITE
; }
242 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_MODIFIED
; }
243 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
244 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
; }
246 static inline pte_t
pte_wrprotect(pte_t pte
)
248 pte_val(pte
) &= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
252 static inline pte_t
pte_mkclean(pte_t pte
)
254 pte_val(pte
) &= ~(_PAGE_MODIFIED
|_PAGE_SILENT_WRITE
);
258 static inline pte_t
pte_mkold(pte_t pte
)
260 pte_val(pte
) &= ~(_PAGE_ACCESSED
|_PAGE_SILENT_READ
);
264 static inline pte_t
pte_mkwrite(pte_t pte
)
266 pte_val(pte
) |= _PAGE_WRITE
;
267 if (pte_val(pte
) & _PAGE_MODIFIED
)
268 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
272 static inline pte_t
pte_mkdirty(pte_t pte
)
274 pte_val(pte
) |= _PAGE_MODIFIED
;
275 if (pte_val(pte
) & _PAGE_WRITE
)
276 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
280 static inline pte_t
pte_mkyoung(pte_t pte
)
282 pte_val(pte
) |= _PAGE_ACCESSED
;
283 if (pte_val(pte
) & _PAGE_READ
)
284 pte_val(pte
) |= _PAGE_SILENT_READ
;
290 * Macro to make mark a page protection value as "uncacheable". Note
291 * that "protection" is really a misnomer here as the protection value
292 * contains the memory attribute bits, dirty bits, and various other
295 #define pgprot_noncached pgprot_noncached
297 static inline pgprot_t
pgprot_noncached(pgprot_t _prot
)
299 unsigned long prot
= pgprot_val(_prot
);
301 prot
= (prot
& ~_CACHE_MASK
) | _CACHE_UNCACHED
;
303 return __pgprot(prot
);
307 * Conversion functions: convert a page and protection to a page entry,
308 * and a page entry and page directory to the page they refer to.
310 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
312 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
313 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
315 pte
.pte_low
&= _PAGE_CHG_MASK
;
316 pte
.pte_high
&= ~0x3f;
317 pte
.pte_low
|= pgprot_val(newprot
);
318 pte
.pte_high
|= pgprot_val(newprot
) & 0x3f;
322 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
324 return __pte((pte_val(pte
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
));
329 extern void __update_tlb(struct vm_area_struct
*vma
, unsigned long address
,
331 extern void __update_cache(struct vm_area_struct
*vma
, unsigned long address
,
334 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
335 unsigned long address
, pte_t pte
)
337 __update_tlb(vma
, address
, pte
);
338 __update_cache(vma
, address
, pte
);
341 #define kern_addr_valid(addr) (1)
343 #ifdef CONFIG_64BIT_PHYS_ADDR
344 extern int remap_pfn_range(struct vm_area_struct
*vma
, unsigned long from
, unsigned long pfn
, unsigned long size
, pgprot_t prot
);
346 static inline int io_remap_pfn_range(struct vm_area_struct
*vma
,
352 phys_t phys_addr_high
= fixup_bigphys_addr(pfn
<< PAGE_SHIFT
, size
);
353 return remap_pfn_range(vma
, vaddr
, phys_addr_high
>> PAGE_SHIFT
, size
, prot
);
356 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
357 remap_pfn_range(vma, vaddr, pfn, size, prot)
360 #include <asm-generic/pgtable.h>
363 * We provide our own get_unmapped area to cope with the virtual aliasing
364 * constraints placed on us by the cache architecture.
366 #define HAVE_ARCH_UNMAPPED_AREA
369 * No page table caches to initialise
371 #define pgtable_cache_init() do { } while (0)
373 #endif /* _ASM_PGTABLE_H */