]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/asm-mips/pgtable.h
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 <linux/config.h>
13 #include <asm/pgtable-32.h>
16 #include <asm/pgtable-64.h>
20 #include <asm/pgtable-bits.h>
23 struct vm_area_struct
;
25 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
26 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
27 PAGE_CACHABLE_DEFAULT)
28 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
29 PAGE_CACHABLE_DEFAULT)
30 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
31 PAGE_CACHABLE_DEFAULT)
32 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
33 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
34 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
35 PAGE_CACHABLE_DEFAULT)
36 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
37 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
40 * MIPS can't do page protection for execute, and considers that the same like
41 * read. Also, write permissions imply read permissions. This is the closest
42 * we can get by reasonable means..
44 #define __P000 PAGE_NONE
45 #define __P001 PAGE_READONLY
46 #define __P010 PAGE_COPY
47 #define __P011 PAGE_COPY
48 #define __P100 PAGE_READONLY
49 #define __P101 PAGE_READONLY
50 #define __P110 PAGE_COPY
51 #define __P111 PAGE_COPY
53 #define __S000 PAGE_NONE
54 #define __S001 PAGE_READONLY
55 #define __S010 PAGE_SHARED
56 #define __S011 PAGE_SHARED
57 #define __S100 PAGE_READONLY
58 #define __S101 PAGE_READONLY
59 #define __S110 PAGE_SHARED
60 #define __S111 PAGE_SHARED
63 * ZERO_PAGE is a global shared page that is always zero; used
64 * for zero-mapped memory areas etc..
67 extern unsigned long empty_zero_page
;
68 extern unsigned long zero_page_mask
;
70 #define ZERO_PAGE(vaddr) \
71 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
73 #define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
75 extern void paging_init(void);
78 * Conversion functions: convert a page and protection to a page entry,
79 * and a page entry and page directory to the page they refer to.
81 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
82 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
83 #define pmd_page_kernel(pmd) pmd_val(pmd)
85 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
86 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
88 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
89 static inline void set_pte(pte_t
*ptep
, pte_t pte
)
91 ptep
->pte_high
= pte
.pte_high
;
93 ptep
->pte_low
= pte
.pte_low
;
94 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
96 if (pte_val(pte
) & _PAGE_GLOBAL
) {
97 pte_t
*buddy
= ptep_buddy(ptep
);
99 * Make sure the buddy is global too (if it's !none,
100 * it better already be global)
102 if (pte_none(*buddy
))
103 buddy
->pte_low
|= _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 /* Preserve global status for the pair */
111 if (pte_val(*ptep_buddy(ptep
)) & _PAGE_GLOBAL
)
112 set_pte_at(mm
, addr
, ptep
, __pte(_PAGE_GLOBAL
));
114 set_pte_at(mm
, addr
, ptep
, __pte(0));
118 * Certain architectures need to do special things when pte's
119 * within a page table are directly modified. Thus, the following
120 * hook is made available.
122 static inline void set_pte(pte_t
*ptep
, pte_t pteval
)
125 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
126 if (pte_val(pteval
) & _PAGE_GLOBAL
) {
127 pte_t
*buddy
= ptep_buddy(ptep
);
129 * Make sure the buddy is global too (if it's !none,
130 * it better already be global)
132 if (pte_none(*buddy
))
133 pte_val(*buddy
) = pte_val(*buddy
) | _PAGE_GLOBAL
;
137 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
139 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
141 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
142 /* Preserve global status for the pair */
143 if (pte_val(*ptep_buddy(ptep
)) & _PAGE_GLOBAL
)
144 set_pte_at(mm
, addr
, ptep
, __pte(_PAGE_GLOBAL
));
147 set_pte_at(mm
, addr
, ptep
, __pte(0));
152 * (pmds are folded into puds so this doesn't get actually called,
153 * but the define is needed for a generic inline function.)
155 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
159 * (puds are folded into pgds so this doesn't get actually called,
160 * but the define is needed for a generic inline function.)
162 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
165 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
166 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
167 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
169 extern pgd_t swapper_pg_dir
[PTRS_PER_PGD
];
172 * The following only work if pte_present() is true.
173 * Undefined behaviour if not..
175 static inline int pte_user(pte_t pte
) { BUG(); return 0; }
176 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
177 static inline int pte_read(pte_t pte
) { return (pte
).pte_low
& _PAGE_READ
; }
178 static inline int pte_write(pte_t pte
) { return (pte
).pte_low
& _PAGE_WRITE
; }
179 static inline int pte_dirty(pte_t pte
) { return (pte
).pte_low
& _PAGE_MODIFIED
; }
180 static inline int pte_young(pte_t pte
) { return (pte
).pte_low
& _PAGE_ACCESSED
; }
181 static inline int pte_file(pte_t pte
) { return (pte
).pte_low
& _PAGE_FILE
; }
182 static inline pte_t
pte_wrprotect(pte_t pte
)
184 (pte
).pte_low
&= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
185 (pte
).pte_high
&= ~_PAGE_SILENT_WRITE
;
189 static inline pte_t
pte_rdprotect(pte_t pte
)
191 (pte
).pte_low
&= ~(_PAGE_READ
| _PAGE_SILENT_READ
);
192 (pte
).pte_high
&= ~_PAGE_SILENT_READ
;
196 static inline pte_t
pte_mkclean(pte_t pte
)
198 (pte
).pte_low
&= ~(_PAGE_MODIFIED
|_PAGE_SILENT_WRITE
);
199 (pte
).pte_high
&= ~_PAGE_SILENT_WRITE
;
203 static inline pte_t
pte_mkold(pte_t pte
)
205 (pte
).pte_low
&= ~(_PAGE_ACCESSED
|_PAGE_SILENT_READ
);
206 (pte
).pte_high
&= ~_PAGE_SILENT_READ
;
210 static inline pte_t
pte_mkwrite(pte_t pte
)
212 (pte
).pte_low
|= _PAGE_WRITE
;
213 if ((pte
).pte_low
& _PAGE_MODIFIED
) {
214 (pte
).pte_low
|= _PAGE_SILENT_WRITE
;
215 (pte
).pte_high
|= _PAGE_SILENT_WRITE
;
220 static inline pte_t
pte_mkread(pte_t pte
)
222 (pte
).pte_low
|= _PAGE_READ
;
223 if ((pte
).pte_low
& _PAGE_ACCESSED
) {
224 (pte
).pte_low
|= _PAGE_SILENT_READ
;
225 (pte
).pte_high
|= _PAGE_SILENT_READ
;
230 static inline pte_t
pte_mkdirty(pte_t pte
)
232 (pte
).pte_low
|= _PAGE_MODIFIED
;
233 if ((pte
).pte_low
& _PAGE_WRITE
) {
234 (pte
).pte_low
|= _PAGE_SILENT_WRITE
;
235 (pte
).pte_high
|= _PAGE_SILENT_WRITE
;
240 static inline pte_t
pte_mkyoung(pte_t pte
)
242 (pte
).pte_low
|= _PAGE_ACCESSED
;
243 if ((pte
).pte_low
& _PAGE_READ
)
244 (pte
).pte_low
|= _PAGE_SILENT_READ
;
245 (pte
).pte_high
|= _PAGE_SILENT_READ
;
249 static inline int pte_read(pte_t pte
) { return pte_val(pte
) & _PAGE_READ
; }
250 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_WRITE
; }
251 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_MODIFIED
; }
252 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
253 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
; }
255 static inline pte_t
pte_wrprotect(pte_t pte
)
257 pte_val(pte
) &= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
261 static inline pte_t
pte_rdprotect(pte_t pte
)
263 pte_val(pte
) &= ~(_PAGE_READ
| _PAGE_SILENT_READ
);
267 static inline pte_t
pte_mkclean(pte_t pte
)
269 pte_val(pte
) &= ~(_PAGE_MODIFIED
|_PAGE_SILENT_WRITE
);
273 static inline pte_t
pte_mkold(pte_t pte
)
275 pte_val(pte
) &= ~(_PAGE_ACCESSED
|_PAGE_SILENT_READ
);
279 static inline pte_t
pte_mkwrite(pte_t pte
)
281 pte_val(pte
) |= _PAGE_WRITE
;
282 if (pte_val(pte
) & _PAGE_MODIFIED
)
283 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
287 static inline pte_t
pte_mkread(pte_t pte
)
289 pte_val(pte
) |= _PAGE_READ
;
290 if (pte_val(pte
) & _PAGE_ACCESSED
)
291 pte_val(pte
) |= _PAGE_SILENT_READ
;
295 static inline pte_t
pte_mkdirty(pte_t pte
)
297 pte_val(pte
) |= _PAGE_MODIFIED
;
298 if (pte_val(pte
) & _PAGE_WRITE
)
299 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
303 static inline pte_t
pte_mkyoung(pte_t pte
)
305 pte_val(pte
) |= _PAGE_ACCESSED
;
306 if (pte_val(pte
) & _PAGE_READ
)
307 pte_val(pte
) |= _PAGE_SILENT_READ
;
313 * Macro to make mark a page protection value as "uncacheable". Note
314 * that "protection" is really a misnomer here as the protection value
315 * contains the memory attribute bits, dirty bits, and various other
318 #define pgprot_noncached pgprot_noncached
320 static inline pgprot_t
pgprot_noncached(pgprot_t _prot
)
322 unsigned long prot
= pgprot_val(_prot
);
324 prot
= (prot
& ~_CACHE_MASK
) | _CACHE_UNCACHED
;
326 return __pgprot(prot
);
330 * Conversion functions: convert a page and protection to a page entry,
331 * and a page entry and page directory to the page they refer to.
333 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
335 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
336 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
338 pte
.pte_low
&= _PAGE_CHG_MASK
;
339 pte
.pte_low
|= pgprot_val(newprot
);
340 pte
.pte_high
|= pgprot_val(newprot
) & 0x3f;
344 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
346 return __pte((pte_val(pte
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
));
351 extern void __update_tlb(struct vm_area_struct
*vma
, unsigned long address
,
353 extern void __update_cache(struct vm_area_struct
*vma
, unsigned long address
,
356 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
357 unsigned long address
, pte_t pte
)
359 __update_tlb(vma
, address
, pte
);
360 __update_cache(vma
, address
, pte
);
363 #ifndef CONFIG_NEED_MULTIPLE_NODES
364 #define kern_addr_valid(addr) (1)
367 #ifdef CONFIG_64BIT_PHYS_ADDR
368 extern int remap_pfn_range(struct vm_area_struct
*vma
, unsigned long from
, unsigned long pfn
, unsigned long size
, pgprot_t prot
);
370 static inline int io_remap_pfn_range(struct vm_area_struct
*vma
,
376 phys_t phys_addr_high
= fixup_bigphys_addr(pfn
<< PAGE_SHIFT
, size
);
377 return remap_pfn_range(vma
, vaddr
, phys_addr_high
>> PAGE_SHIFT
, size
, prot
);
380 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
381 remap_pfn_range(vma, vaddr, pfn, size, prot)
384 #define MK_IOSPACE_PFN(space, pfn) (pfn)
385 #define GET_IOSPACE(pfn) 0
386 #define GET_PFN(pfn) (pfn)
388 #include <asm-generic/pgtable.h>
391 * We provide our own get_unmapped area to cope with the virtual aliasing
392 * constraints placed on us by the cache architecture.
394 #define HAVE_ARCH_UNMAPPED_AREA
397 * No page table caches to initialise
399 #define pgtable_cache_init() do { } while (0)
401 #endif /* _ASM_PGTABLE_H */