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
11 #include <asm-generic/4level-fixup.h>
13 #include <linux/config.h>
15 #include <asm/pgtable-32.h>
18 #include <asm/pgtable-64.h>
21 #include <asm/pgtable-bits.h>
23 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
24 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
25 PAGE_CACHABLE_DEFAULT)
26 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
27 PAGE_CACHABLE_DEFAULT)
28 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
29 PAGE_CACHABLE_DEFAULT)
30 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
31 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
32 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
33 PAGE_CACHABLE_DEFAULT)
34 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
35 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
38 * MIPS can't do page protection for execute, and considers that the same like
39 * read. Also, write permissions imply read permissions. This is the closest
40 * we can get by reasonable means..
42 #define __P000 PAGE_NONE
43 #define __P001 PAGE_READONLY
44 #define __P010 PAGE_COPY
45 #define __P011 PAGE_COPY
46 #define __P100 PAGE_READONLY
47 #define __P101 PAGE_READONLY
48 #define __P110 PAGE_COPY
49 #define __P111 PAGE_COPY
51 #define __S000 PAGE_NONE
52 #define __S001 PAGE_READONLY
53 #define __S010 PAGE_SHARED
54 #define __S011 PAGE_SHARED
55 #define __S100 PAGE_READONLY
56 #define __S101 PAGE_READONLY
57 #define __S110 PAGE_SHARED
58 #define __S111 PAGE_SHARED
61 * ZERO_PAGE is a global shared page that is always zero; used
62 * for zero-mapped memory areas etc..
65 extern unsigned long empty_zero_page
;
66 extern unsigned long zero_page_mask
;
68 #define ZERO_PAGE(vaddr) \
69 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
71 extern void paging_init(void);
74 * Conversion functions: convert a page and protection to a page entry,
75 * and a page entry and page directory to the page they refer to.
77 #define page_pte(page) page_pte_prot(page, __pgprot(0))
78 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
79 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
80 #define pmd_page_kernel(pmd) pmd_val(pmd)
82 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
83 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
85 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
86 static inline void set_pte(pte_t
*ptep
, pte_t pte
)
88 ptep
->pte_high
= pte
.pte_high
;
90 ptep
->pte_low
= pte
.pte_low
;
91 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
93 if (pte_val(pte
) & _PAGE_GLOBAL
) {
94 pte_t
*buddy
= ptep_buddy(ptep
);
96 * Make sure the buddy is global too (if it's !none,
97 * it better already be global)
100 buddy
->pte_low
|= _PAGE_GLOBAL
;
103 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
105 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
107 /* Preserve global status for the pair */
108 if (pte_val(*ptep_buddy(ptep
)) & _PAGE_GLOBAL
)
109 set_pte_at(mm
, addr
, ptep
, __pte(_PAGE_GLOBAL
));
111 set_pte_at(mm
, addr
, ptep
, __pte(0));
115 * Certain architectures need to do special things when pte's
116 * within a page table are directly modified. Thus, the following
117 * hook is made available.
119 static inline void set_pte(pte_t
*ptep
, pte_t pteval
)
122 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
123 if (pte_val(pteval
) & _PAGE_GLOBAL
) {
124 pte_t
*buddy
= ptep_buddy(ptep
);
126 * Make sure the buddy is global too (if it's !none,
127 * it better already be global)
129 if (pte_none(*buddy
))
130 pte_val(*buddy
) = pte_val(*buddy
) | _PAGE_GLOBAL
;
134 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
136 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
138 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
139 /* Preserve global status for the pair */
140 if (pte_val(*ptep_buddy(ptep
)) & _PAGE_GLOBAL
)
141 set_pte_at(mm
, addr
, ptep
, __pte(_PAGE_GLOBAL
));
144 set_pte_at(mm
, addr
, ptep
, __pte(0));
149 * (pmds are folded into pgds so this doesn't get actually called,
150 * but the define is needed for a generic inline function.)
152 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
153 #define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
155 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
156 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
157 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
159 extern pgd_t swapper_pg_dir
[PTRS_PER_PGD
];
162 * The following only work if pte_present() is true.
163 * Undefined behaviour if not..
165 static inline int pte_user(pte_t pte
) { BUG(); return 0; }
166 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
167 static inline int pte_read(pte_t pte
) { return (pte
).pte_low
& _PAGE_READ
; }
168 static inline int pte_write(pte_t pte
) { return (pte
).pte_low
& _PAGE_WRITE
; }
169 static inline int pte_dirty(pte_t pte
) { return (pte
).pte_low
& _PAGE_MODIFIED
; }
170 static inline int pte_young(pte_t pte
) { return (pte
).pte_low
& _PAGE_ACCESSED
; }
171 static inline int pte_file(pte_t pte
) { return (pte
).pte_low
& _PAGE_FILE
; }
172 static inline pte_t
pte_wrprotect(pte_t pte
)
174 (pte
).pte_low
&= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
175 (pte
).pte_high
&= ~_PAGE_SILENT_WRITE
;
179 static inline pte_t
pte_rdprotect(pte_t pte
)
181 (pte
).pte_low
&= ~(_PAGE_READ
| _PAGE_SILENT_READ
);
182 (pte
).pte_high
&= ~_PAGE_SILENT_READ
;
186 static inline pte_t
pte_mkclean(pte_t pte
)
188 (pte
).pte_low
&= ~(_PAGE_MODIFIED
|_PAGE_SILENT_WRITE
);
189 (pte
).pte_high
&= ~_PAGE_SILENT_WRITE
;
193 static inline pte_t
pte_mkold(pte_t pte
)
195 (pte
).pte_low
&= ~(_PAGE_ACCESSED
|_PAGE_SILENT_READ
);
196 (pte
).pte_high
&= ~_PAGE_SILENT_READ
;
200 static inline pte_t
pte_mkwrite(pte_t pte
)
202 (pte
).pte_low
|= _PAGE_WRITE
;
203 if ((pte
).pte_low
& _PAGE_MODIFIED
) {
204 (pte
).pte_low
|= _PAGE_SILENT_WRITE
;
205 (pte
).pte_high
|= _PAGE_SILENT_WRITE
;
210 static inline pte_t
pte_mkread(pte_t pte
)
212 (pte
).pte_low
|= _PAGE_READ
;
213 if ((pte
).pte_low
& _PAGE_ACCESSED
) {
214 (pte
).pte_low
|= _PAGE_SILENT_READ
;
215 (pte
).pte_high
|= _PAGE_SILENT_READ
;
220 static inline pte_t
pte_mkdirty(pte_t pte
)
222 (pte
).pte_low
|= _PAGE_MODIFIED
;
223 if ((pte
).pte_low
& _PAGE_WRITE
) {
224 (pte
).pte_low
|= _PAGE_SILENT_WRITE
;
225 (pte
).pte_high
|= _PAGE_SILENT_WRITE
;
230 static inline pte_t
pte_mkyoung(pte_t pte
)
232 (pte
).pte_low
|= _PAGE_ACCESSED
;
233 if ((pte
).pte_low
& _PAGE_READ
)
234 (pte
).pte_low
|= _PAGE_SILENT_READ
;
235 (pte
).pte_high
|= _PAGE_SILENT_READ
;
239 static inline int pte_read(pte_t pte
) { return pte_val(pte
) & _PAGE_READ
; }
240 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_WRITE
; }
241 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_MODIFIED
; }
242 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
243 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
; }
245 static inline pte_t
pte_wrprotect(pte_t pte
)
247 pte_val(pte
) &= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
251 static inline pte_t
pte_rdprotect(pte_t pte
)
253 pte_val(pte
) &= ~(_PAGE_READ
| _PAGE_SILENT_READ
);
257 static inline pte_t
pte_mkclean(pte_t pte
)
259 pte_val(pte
) &= ~(_PAGE_MODIFIED
|_PAGE_SILENT_WRITE
);
263 static inline pte_t
pte_mkold(pte_t pte
)
265 pte_val(pte
) &= ~(_PAGE_ACCESSED
|_PAGE_SILENT_READ
);
269 static inline pte_t
pte_mkwrite(pte_t pte
)
271 pte_val(pte
) |= _PAGE_WRITE
;
272 if (pte_val(pte
) & _PAGE_MODIFIED
)
273 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
277 static inline pte_t
pte_mkread(pte_t pte
)
279 pte_val(pte
) |= _PAGE_READ
;
280 if (pte_val(pte
) & _PAGE_ACCESSED
)
281 pte_val(pte
) |= _PAGE_SILENT_READ
;
285 static inline pte_t
pte_mkdirty(pte_t pte
)
287 pte_val(pte
) |= _PAGE_MODIFIED
;
288 if (pte_val(pte
) & _PAGE_WRITE
)
289 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
293 static inline pte_t
pte_mkyoung(pte_t pte
)
295 pte_val(pte
) |= _PAGE_ACCESSED
;
296 if (pte_val(pte
) & _PAGE_READ
)
297 pte_val(pte
) |= _PAGE_SILENT_READ
;
303 * Macro to make mark a page protection value as "uncacheable". Note
304 * that "protection" is really a misnomer here as the protection value
305 * contains the memory attribute bits, dirty bits, and various other
308 #define pgprot_noncached pgprot_noncached
310 static inline pgprot_t
pgprot_noncached(pgprot_t _prot
)
312 unsigned long prot
= pgprot_val(_prot
);
314 prot
= (prot
& ~_CACHE_MASK
) | _CACHE_UNCACHED
;
316 return __pgprot(prot
);
320 * Conversion functions: convert a page and protection to a page entry,
321 * and a page entry and page directory to the page they refer to.
323 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
325 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
326 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
328 pte
.pte_low
&= _PAGE_CHG_MASK
;
329 pte
.pte_low
|= pgprot_val(newprot
);
330 pte
.pte_high
|= pgprot_val(newprot
) & 0x3f;
334 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
336 return __pte((pte_val(pte
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
));
341 extern void __update_tlb(struct vm_area_struct
*vma
, unsigned long address
,
343 extern void __update_cache(struct vm_area_struct
*vma
, unsigned long address
,
346 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
347 unsigned long address
, pte_t pte
)
349 __update_tlb(vma
, address
, pte
);
350 __update_cache(vma
, address
, pte
);
353 #ifndef CONFIG_DISCONTIGMEM
354 #define kern_addr_valid(addr) (1)
357 #ifdef CONFIG_64BIT_PHYS_ADDR
358 extern phys_t
fixup_bigphys_addr(phys_t phys_addr
, phys_t size
);
359 extern int remap_pfn_range(struct vm_area_struct
*vma
, unsigned long from
, unsigned long pfn
, unsigned long size
, pgprot_t prot
);
361 static inline int io_remap_page_range(struct vm_area_struct
*vma
,
367 phys_t phys_addr_high
= fixup_bigphys_addr(paddr
, size
);
368 return remap_pfn_range(vma
, vaddr
, phys_addr_high
>> PAGE_SHIFT
, size
, prot
);
371 static inline int io_remap_pfn_range(struct vm_area_struct
*vma
,
377 phys_t phys_addr_high
= fixup_bigphys_addr(pfn
<< PAGE_SHIFT
, size
);
378 return remap_pfn_range(vma
, vaddr
, pfn
, size
, prot
);
381 #define io_remap_page_range(vma, vaddr, paddr, size, prot) \
382 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
383 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
384 remap_pfn_range(vma, vaddr, pfn, size, prot)
387 #define MK_IOSPACE_PFN(space, pfn) (pfn)
388 #define GET_IOSPACE(pfn) 0
389 #define GET_PFN(pfn) (pfn)
391 #include <asm-generic/pgtable.h>
394 * We provide our own get_unmapped area to cope with the virtual aliasing
395 * constraints placed on us by the cache architecture.
397 #define HAVE_ARCH_UNMAPPED_AREA
400 * No page table caches to initialise
402 #define pgtable_cache_init() do { } while (0)
404 #endif /* _ASM_PGTABLE_H */
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