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..
45 * Dummy values to fill the table in mmap.c
46 * The real values will be generated at runtime
48 #define __P000 __pgprot(0)
49 #define __P001 __pgprot(0)
50 #define __P010 __pgprot(0)
51 #define __P011 __pgprot(0)
52 #define __P100 __pgprot(0)
53 #define __P101 __pgprot(0)
54 #define __P110 __pgprot(0)
55 #define __P111 __pgprot(0)
57 #define __S000 __pgprot(0)
58 #define __S001 __pgprot(0)
59 #define __S010 __pgprot(0)
60 #define __S011 __pgprot(0)
61 #define __S100 __pgprot(0)
62 #define __S101 __pgprot(0)
63 #define __S110 __pgprot(0)
64 #define __S111 __pgprot(0)
66 extern unsigned long _page_cachable_default
;
69 * ZERO_PAGE is a global shared page that is always zero; used
70 * for zero-mapped memory areas etc..
73 extern unsigned long empty_zero_page
;
74 extern unsigned long zero_page_mask
;
76 #define ZERO_PAGE(vaddr) \
77 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
79 extern void paging_init(void);
82 * Conversion functions: convert a page and protection to a page entry,
83 * and a page entry and page directory to the page they refer to.
85 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
86 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
87 #define pmd_page_vaddr(pmd) pmd_val(pmd)
89 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
91 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
92 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
94 static inline void set_pte(pte_t
*ptep
, pte_t pte
)
96 ptep
->pte_high
= pte
.pte_high
;
98 ptep
->pte_low
= pte
.pte_low
;
99 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
101 if (pte
.pte_low
& _PAGE_GLOBAL
) {
102 pte_t
*buddy
= ptep_buddy(ptep
);
104 * Make sure the buddy is global too (if it's !none,
105 * it better already be global)
107 if (pte_none(*buddy
)) {
108 buddy
->pte_low
|= _PAGE_GLOBAL
;
109 buddy
->pte_high
|= _PAGE_GLOBAL
;
113 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
115 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
117 pte_t null
= __pte(0);
119 /* Preserve global status for the pair */
120 if (ptep_buddy(ptep
)->pte_low
& _PAGE_GLOBAL
)
121 null
.pte_low
= null
.pte_high
= _PAGE_GLOBAL
;
123 set_pte_at(mm
, addr
, ptep
, null
);
127 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
128 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
131 * Certain architectures need to do special things when pte's
132 * within a page table are directly modified. Thus, the following
133 * hook is made available.
135 static inline void set_pte(pte_t
*ptep
, pte_t pteval
)
138 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
139 if (pte_val(pteval
) & _PAGE_GLOBAL
) {
140 pte_t
*buddy
= ptep_buddy(ptep
);
142 * Make sure the buddy is global too (if it's !none,
143 * it better already be global)
145 if (pte_none(*buddy
))
146 pte_val(*buddy
) = pte_val(*buddy
) | _PAGE_GLOBAL
;
150 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
152 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
154 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
155 /* Preserve global status for the pair */
156 if (pte_val(*ptep_buddy(ptep
)) & _PAGE_GLOBAL
)
157 set_pte_at(mm
, addr
, ptep
, __pte(_PAGE_GLOBAL
));
160 set_pte_at(mm
, addr
, ptep
, __pte(0));
165 * (pmds are folded into puds so this doesn't get actually called,
166 * but the define is needed for a generic inline function.)
168 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
172 * (puds are folded into pgds so this doesn't get actually called,
173 * but the define is needed for a generic inline function.)
175 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
178 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
179 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
180 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
183 * We used to declare this array with size but gcc 3.3 and older are not able
184 * to find that this expression is a constant, so the size is dropped.
186 extern pgd_t swapper_pg_dir
[];
189 * The following only work if pte_present() is true.
190 * Undefined behaviour if not..
192 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
193 static inline int pte_write(pte_t pte
) { return pte
.pte_low
& _PAGE_WRITE
; }
194 static inline int pte_dirty(pte_t pte
) { return pte
.pte_low
& _PAGE_MODIFIED
; }
195 static inline int pte_young(pte_t pte
) { return pte
.pte_low
& _PAGE_ACCESSED
; }
196 static inline int pte_file(pte_t pte
) { return pte
.pte_low
& _PAGE_FILE
; }
198 static inline pte_t
pte_wrprotect(pte_t pte
)
200 pte
.pte_low
&= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
201 pte
.pte_high
&= ~_PAGE_SILENT_WRITE
;
205 static inline pte_t
pte_mkclean(pte_t pte
)
207 pte
.pte_low
&= ~(_PAGE_MODIFIED
| _PAGE_SILENT_WRITE
);
208 pte
.pte_high
&= ~_PAGE_SILENT_WRITE
;
212 static inline pte_t
pte_mkold(pte_t pte
)
214 pte
.pte_low
&= ~(_PAGE_ACCESSED
| _PAGE_SILENT_READ
);
215 pte
.pte_high
&= ~_PAGE_SILENT_READ
;
219 static inline pte_t
pte_mkwrite(pte_t pte
)
221 pte
.pte_low
|= _PAGE_WRITE
;
222 if (pte
.pte_low
& _PAGE_MODIFIED
) {
223 pte
.pte_low
|= _PAGE_SILENT_WRITE
;
224 pte
.pte_high
|= _PAGE_SILENT_WRITE
;
229 static inline pte_t
pte_mkdirty(pte_t pte
)
231 pte
.pte_low
|= _PAGE_MODIFIED
;
232 if (pte
.pte_low
& _PAGE_WRITE
) {
233 pte
.pte_low
|= _PAGE_SILENT_WRITE
;
234 pte
.pte_high
|= _PAGE_SILENT_WRITE
;
239 static inline pte_t
pte_mkyoung(pte_t pte
)
241 pte
.pte_low
|= _PAGE_ACCESSED
;
242 if (pte
.pte_low
& _PAGE_READ
) {
243 pte
.pte_low
|= _PAGE_SILENT_READ
;
244 pte
.pte_high
|= _PAGE_SILENT_READ
;
249 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_WRITE
; }
250 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_MODIFIED
; }
251 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
252 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
; }
254 static inline pte_t
pte_wrprotect(pte_t pte
)
256 pte_val(pte
) &= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
260 static inline pte_t
pte_mkclean(pte_t pte
)
262 pte_val(pte
) &= ~(_PAGE_MODIFIED
|_PAGE_SILENT_WRITE
);
266 static inline pte_t
pte_mkold(pte_t pte
)
268 pte_val(pte
) &= ~(_PAGE_ACCESSED
|_PAGE_SILENT_READ
);
272 static inline pte_t
pte_mkwrite(pte_t pte
)
274 pte_val(pte
) |= _PAGE_WRITE
;
275 if (pte_val(pte
) & _PAGE_MODIFIED
)
276 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
280 static inline pte_t
pte_mkdirty(pte_t pte
)
282 pte_val(pte
) |= _PAGE_MODIFIED
;
283 if (pte_val(pte
) & _PAGE_WRITE
)
284 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
288 static inline pte_t
pte_mkyoung(pte_t pte
)
290 pte_val(pte
) |= _PAGE_ACCESSED
;
291 if (pte_val(pte
) & _PAGE_READ
)
292 pte_val(pte
) |= _PAGE_SILENT_READ
;
296 static inline int pte_special(pte_t pte
) { return 0; }
297 static inline pte_t
pte_mkspecial(pte_t pte
) { return pte
; }
300 * Macro to make mark a page protection value as "uncacheable". Note
301 * that "protection" is really a misnomer here as the protection value
302 * contains the memory attribute bits, dirty bits, and various other
305 #define pgprot_noncached pgprot_noncached
307 static inline pgprot_t
pgprot_noncached(pgprot_t _prot
)
309 unsigned long prot
= pgprot_val(_prot
);
311 prot
= (prot
& ~_CACHE_MASK
) | _CACHE_UNCACHED
;
313 return __pgprot(prot
);
317 * Conversion functions: convert a page and protection to a page entry,
318 * and a page entry and page directory to the page they refer to.
320 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
322 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
323 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
325 pte
.pte_low
&= _PAGE_CHG_MASK
;
326 pte
.pte_high
&= ~0x3f;
327 pte
.pte_low
|= pgprot_val(newprot
);
328 pte
.pte_high
|= pgprot_val(newprot
) & 0x3f;
332 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
334 return __pte((pte_val(pte
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
));
339 extern void __update_tlb(struct vm_area_struct
*vma
, unsigned long address
,
341 extern void __update_cache(struct vm_area_struct
*vma
, unsigned long address
,
344 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
345 unsigned long address
, pte_t pte
)
347 __update_tlb(vma
, address
, pte
);
348 __update_cache(vma
, address
, pte
);
351 #define kern_addr_valid(addr) (1)
353 #ifdef CONFIG_64BIT_PHYS_ADDR
354 extern int remap_pfn_range(struct vm_area_struct
*vma
, unsigned long from
, unsigned long pfn
, unsigned long size
, pgprot_t prot
);
356 static inline int io_remap_pfn_range(struct vm_area_struct
*vma
,
362 phys_t phys_addr_high
= fixup_bigphys_addr(pfn
<< PAGE_SHIFT
, size
);
363 return remap_pfn_range(vma
, vaddr
, phys_addr_high
>> PAGE_SHIFT
, size
, prot
);
366 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
367 remap_pfn_range(vma, vaddr, pfn, size, prot)
370 #include <asm-generic/pgtable.h>
373 * We provide our own get_unmapped area to cope with the virtual aliasing
374 * constraints placed on us by the cache architecture.
376 #define HAVE_ARCH_UNMAPPED_AREA
379 * No page table caches to initialise
381 #define pgtable_cache_init() do { } while (0)
383 #endif /* _ASM_PGTABLE_H */
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