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/mm_types.h>
12 #include <linux/mmzone.h>
14 #include <asm/pgtable-32.h>
17 #include <asm/pgtable-64.h>
21 #include <asm/pgtable-bits.h>
24 struct vm_area_struct
;
26 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
27 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | \
28 _page_cachable_default)
29 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_NO_EXEC | \
30 _page_cachable_default)
31 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
32 _page_cachable_default)
33 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
34 _PAGE_GLOBAL | _page_cachable_default)
35 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
36 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
37 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
38 _page_cachable_default)
39 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
40 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
43 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
44 * execute, and consider it to be the same as read. Also, write
45 * permissions imply read permissions. This is the closest we can get
46 * by reasonable means..
50 * Dummy values to fill the table in mmap.c
51 * The real values will be generated at runtime
53 #define __P000 __pgprot(0)
54 #define __P001 __pgprot(0)
55 #define __P010 __pgprot(0)
56 #define __P011 __pgprot(0)
57 #define __P100 __pgprot(0)
58 #define __P101 __pgprot(0)
59 #define __P110 __pgprot(0)
60 #define __P111 __pgprot(0)
62 #define __S000 __pgprot(0)
63 #define __S001 __pgprot(0)
64 #define __S010 __pgprot(0)
65 #define __S011 __pgprot(0)
66 #define __S100 __pgprot(0)
67 #define __S101 __pgprot(0)
68 #define __S110 __pgprot(0)
69 #define __S111 __pgprot(0)
71 extern unsigned long _page_cachable_default
;
74 * ZERO_PAGE is a global shared page that is always zero; used
75 * for zero-mapped memory areas etc..
78 extern unsigned long empty_zero_page
;
79 extern unsigned long zero_page_mask
;
81 #define ZERO_PAGE(vaddr) \
82 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
83 #define __HAVE_COLOR_ZERO_PAGE
85 extern void paging_init(void);
88 * Conversion functions: convert a page and protection to a page entry,
89 * and a page entry and page directory to the page they refer to.
91 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
93 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
94 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
95 #define pmd_page(pmd) __pmd_page(pmd)
96 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
98 #define pmd_page_vaddr(pmd) pmd_val(pmd)
102 unsigned long flags; \
105 local_irq_save(flags); \
106 if(!raw_current_cpu_data.htw_seq++) { \
107 write_c0_pwctl(read_c0_pwctl() & \
108 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
109 back_to_back_c0_hazard(); \
111 local_irq_restore(flags); \
115 #define htw_start() \
117 unsigned long flags; \
120 local_irq_save(flags); \
121 if (!--raw_current_cpu_data.htw_seq) { \
122 write_c0_pwctl(read_c0_pwctl() | \
123 (1 << MIPS_PWCTL_PWEN_SHIFT)); \
124 back_to_back_c0_hazard(); \
126 local_irq_restore(flags); \
130 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
132 #define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
133 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
135 static inline void set_pte(pte_t
*ptep
, pte_t pte
)
137 ptep
->pte_high
= pte
.pte_high
;
139 ptep
->pte_low
= pte
.pte_low
;
141 if (pte
.pte_high
& _PAGE_GLOBAL
) {
142 pte_t
*buddy
= ptep_buddy(ptep
);
144 * Make sure the buddy is global too (if it's !none,
145 * it better already be global)
147 if (pte_none(*buddy
))
148 buddy
->pte_high
|= _PAGE_GLOBAL
;
151 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
153 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
155 pte_t null
= __pte(0);
158 /* Preserve global status for the pair */
159 if (ptep_buddy(ptep
)->pte_high
& _PAGE_GLOBAL
)
160 null
.pte_high
= _PAGE_GLOBAL
;
162 set_pte_at(mm
, addr
, ptep
, null
);
167 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
168 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
171 * Certain architectures need to do special things when pte's
172 * within a page table are directly modified. Thus, the following
173 * hook is made available.
175 static inline void set_pte(pte_t
*ptep
, pte_t pteval
)
178 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
179 if (pte_val(pteval
) & _PAGE_GLOBAL
) {
180 pte_t
*buddy
= ptep_buddy(ptep
);
182 * Make sure the buddy is global too (if it's !none,
183 * it better already be global)
185 if (pte_none(*buddy
))
186 pte_val(*buddy
) = pte_val(*buddy
) | _PAGE_GLOBAL
;
190 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
192 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
195 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
196 /* Preserve global status for the pair */
197 if (pte_val(*ptep_buddy(ptep
)) & _PAGE_GLOBAL
)
198 set_pte_at(mm
, addr
, ptep
, __pte(_PAGE_GLOBAL
));
201 set_pte_at(mm
, addr
, ptep
, __pte(0));
207 * (pmds are folded into puds so this doesn't get actually called,
208 * but the define is needed for a generic inline function.)
210 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
212 #ifndef __PAGETABLE_PMD_FOLDED
214 * (puds are folded into pgds so this doesn't get actually called,
215 * but the define is needed for a generic inline function.)
217 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
220 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
221 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
222 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
225 * We used to declare this array with size but gcc 3.3 and older are not able
226 * to find that this expression is a constant, so the size is dropped.
228 extern pgd_t swapper_pg_dir
[];
231 * The following only work if pte_present() is true.
232 * Undefined behaviour if not..
234 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
235 static inline int pte_write(pte_t pte
) { return pte
.pte_low
& _PAGE_WRITE
; }
236 static inline int pte_dirty(pte_t pte
) { return pte
.pte_low
& _PAGE_MODIFIED
; }
237 static inline int pte_young(pte_t pte
) { return pte
.pte_low
& _PAGE_ACCESSED
; }
239 static inline pte_t
pte_wrprotect(pte_t pte
)
241 pte
.pte_low
&= ~_PAGE_WRITE
;
242 pte
.pte_high
&= ~_PAGE_SILENT_WRITE
;
246 static inline pte_t
pte_mkclean(pte_t pte
)
248 pte
.pte_low
&= ~_PAGE_MODIFIED
;
249 pte
.pte_high
&= ~_PAGE_SILENT_WRITE
;
253 static inline pte_t
pte_mkold(pte_t pte
)
255 pte
.pte_low
&= ~_PAGE_ACCESSED
;
256 pte
.pte_high
&= ~_PAGE_SILENT_READ
;
260 static inline pte_t
pte_mkwrite(pte_t pte
)
262 pte
.pte_low
|= _PAGE_WRITE
;
263 if (pte
.pte_low
& _PAGE_MODIFIED
)
264 pte
.pte_high
|= _PAGE_SILENT_WRITE
;
268 static inline pte_t
pte_mkdirty(pte_t pte
)
270 pte
.pte_low
|= _PAGE_MODIFIED
;
271 if (pte
.pte_low
& _PAGE_WRITE
)
272 pte
.pte_high
|= _PAGE_SILENT_WRITE
;
276 static inline pte_t
pte_mkyoung(pte_t pte
)
278 pte
.pte_low
|= _PAGE_ACCESSED
;
279 if (pte
.pte_low
& _PAGE_READ
)
280 pte
.pte_high
|= _PAGE_SILENT_READ
;
284 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_WRITE
; }
285 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_MODIFIED
; }
286 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
288 static inline pte_t
pte_wrprotect(pte_t pte
)
290 pte_val(pte
) &= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
294 static inline pte_t
pte_mkclean(pte_t pte
)
296 pte_val(pte
) &= ~(_PAGE_MODIFIED
| _PAGE_SILENT_WRITE
);
300 static inline pte_t
pte_mkold(pte_t pte
)
302 pte_val(pte
) &= ~(_PAGE_ACCESSED
| _PAGE_SILENT_READ
);
306 static inline pte_t
pte_mkwrite(pte_t pte
)
308 pte_val(pte
) |= _PAGE_WRITE
;
309 if (pte_val(pte
) & _PAGE_MODIFIED
)
310 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
314 static inline pte_t
pte_mkdirty(pte_t pte
)
316 pte_val(pte
) |= _PAGE_MODIFIED
;
317 if (pte_val(pte
) & _PAGE_WRITE
)
318 pte_val(pte
) |= _PAGE_SILENT_WRITE
;
322 static inline pte_t
pte_mkyoung(pte_t pte
)
324 pte_val(pte
) |= _PAGE_ACCESSED
;
325 #ifdef CONFIG_CPU_MIPSR2
326 if (!(pte_val(pte
) & _PAGE_NO_READ
))
327 pte_val(pte
) |= _PAGE_SILENT_READ
;
330 if (pte_val(pte
) & _PAGE_READ
)
331 pte_val(pte
) |= _PAGE_SILENT_READ
;
335 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
336 static inline int pte_huge(pte_t pte
) { return pte_val(pte
) & _PAGE_HUGE
; }
338 static inline pte_t
pte_mkhuge(pte_t pte
)
340 pte_val(pte
) |= _PAGE_HUGE
;
343 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
345 static inline int pte_special(pte_t pte
) { return 0; }
346 static inline pte_t
pte_mkspecial(pte_t pte
) { return pte
; }
349 * Macro to make mark a page protection value as "uncacheable". Note
350 * that "protection" is really a misnomer here as the protection value
351 * contains the memory attribute bits, dirty bits, and various other
354 #define pgprot_noncached pgprot_noncached
356 static inline pgprot_t
pgprot_noncached(pgprot_t _prot
)
358 unsigned long prot
= pgprot_val(_prot
);
360 prot
= (prot
& ~_CACHE_MASK
) | _CACHE_UNCACHED
;
362 return __pgprot(prot
);
365 static inline pgprot_t
pgprot_writecombine(pgprot_t _prot
)
367 unsigned long prot
= pgprot_val(_prot
);
369 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
370 prot
= (prot
& ~_CACHE_MASK
) | cpu_data
[0].writecombine
;
372 return __pgprot(prot
);
376 * Conversion functions: convert a page and protection to a page entry,
377 * and a page entry and page directory to the page they refer to.
379 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
381 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
382 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
384 pte
.pte_low
&= (_PAGE_MODIFIED
| _PAGE_ACCESSED
| _PFNX_MASK
);
385 pte
.pte_high
&= (_PFN_MASK
| _CACHE_MASK
);
386 pte
.pte_low
|= pgprot_val(newprot
) & ~_PFNX_MASK
;
387 pte
.pte_high
|= pgprot_val(newprot
) & ~_PFN_MASK
;
391 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
393 return __pte((pte_val(pte
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
));
398 extern void __update_tlb(struct vm_area_struct
*vma
, unsigned long address
,
400 extern void __update_cache(struct vm_area_struct
*vma
, unsigned long address
,
403 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
404 unsigned long address
, pte_t
*ptep
)
407 __update_tlb(vma
, address
, pte
);
408 __update_cache(vma
, address
, pte
);
411 static inline void update_mmu_cache_pmd(struct vm_area_struct
*vma
,
412 unsigned long address
, pmd_t
*pmdp
)
414 pte_t pte
= *(pte_t
*)pmdp
;
416 __update_tlb(vma
, address
, pte
);
419 #define kern_addr_valid(addr) (1)
421 #ifdef CONFIG_PHYS_ADDR_T_64BIT
422 extern int remap_pfn_range(struct vm_area_struct
*vma
, unsigned long from
, unsigned long pfn
, unsigned long size
, pgprot_t prot
);
424 static inline int io_remap_pfn_range(struct vm_area_struct
*vma
,
430 phys_addr_t phys_addr_high
= fixup_bigphys_addr(pfn
<< PAGE_SHIFT
, size
);
431 return remap_pfn_range(vma
, vaddr
, phys_addr_high
>> PAGE_SHIFT
, size
, prot
);
433 #define io_remap_pfn_range io_remap_pfn_range
436 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
438 extern int has_transparent_hugepage(void);
440 static inline int pmd_trans_huge(pmd_t pmd
)
442 return !!(pmd_val(pmd
) & _PAGE_HUGE
);
445 static inline pmd_t
pmd_mkhuge(pmd_t pmd
)
447 pmd_val(pmd
) |= _PAGE_HUGE
;
452 static inline int pmd_trans_splitting(pmd_t pmd
)
454 return !!(pmd_val(pmd
) & _PAGE_SPLITTING
);
457 static inline pmd_t
pmd_mksplitting(pmd_t pmd
)
459 pmd_val(pmd
) |= _PAGE_SPLITTING
;
464 extern void set_pmd_at(struct mm_struct
*mm
, unsigned long addr
,
465 pmd_t
*pmdp
, pmd_t pmd
);
467 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
468 /* Extern to avoid header file madness */
469 extern void pmdp_splitting_flush(struct vm_area_struct
*vma
,
470 unsigned long address
,
473 #define __HAVE_ARCH_PMD_WRITE
474 static inline int pmd_write(pmd_t pmd
)
476 return !!(pmd_val(pmd
) & _PAGE_WRITE
);
479 static inline pmd_t
pmd_wrprotect(pmd_t pmd
)
481 pmd_val(pmd
) &= ~(_PAGE_WRITE
| _PAGE_SILENT_WRITE
);
485 static inline pmd_t
pmd_mkwrite(pmd_t pmd
)
487 pmd_val(pmd
) |= _PAGE_WRITE
;
488 if (pmd_val(pmd
) & _PAGE_MODIFIED
)
489 pmd_val(pmd
) |= _PAGE_SILENT_WRITE
;
494 static inline int pmd_dirty(pmd_t pmd
)
496 return !!(pmd_val(pmd
) & _PAGE_MODIFIED
);
499 static inline pmd_t
pmd_mkclean(pmd_t pmd
)
501 pmd_val(pmd
) &= ~(_PAGE_MODIFIED
| _PAGE_SILENT_WRITE
);
505 static inline pmd_t
pmd_mkdirty(pmd_t pmd
)
507 pmd_val(pmd
) |= _PAGE_MODIFIED
;
508 if (pmd_val(pmd
) & _PAGE_WRITE
)
509 pmd_val(pmd
) |= _PAGE_SILENT_WRITE
;
514 static inline int pmd_young(pmd_t pmd
)
516 return !!(pmd_val(pmd
) & _PAGE_ACCESSED
);
519 static inline pmd_t
pmd_mkold(pmd_t pmd
)
521 pmd_val(pmd
) &= ~(_PAGE_ACCESSED
|_PAGE_SILENT_READ
);
526 static inline pmd_t
pmd_mkyoung(pmd_t pmd
)
528 pmd_val(pmd
) |= _PAGE_ACCESSED
;
530 #ifdef CONFIG_CPU_MIPSR2
531 if (!(pmd_val(pmd
) & _PAGE_NO_READ
))
532 pmd_val(pmd
) |= _PAGE_SILENT_READ
;
535 if (pmd_val(pmd
) & _PAGE_READ
)
536 pmd_val(pmd
) |= _PAGE_SILENT_READ
;
541 /* Extern to avoid header file madness */
542 extern pmd_t
mk_pmd(struct page
*page
, pgprot_t prot
);
544 static inline unsigned long pmd_pfn(pmd_t pmd
)
546 return pmd_val(pmd
) >> _PFN_SHIFT
;
549 static inline struct page
*pmd_page(pmd_t pmd
)
551 if (pmd_trans_huge(pmd
))
552 return pfn_to_page(pmd_pfn(pmd
));
554 return pfn_to_page(pmd_phys(pmd
) >> PAGE_SHIFT
);
557 static inline pmd_t
pmd_modify(pmd_t pmd
, pgprot_t newprot
)
559 pmd_val(pmd
) = (pmd_val(pmd
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
);
563 static inline pmd_t
pmd_mknotpresent(pmd_t pmd
)
565 pmd_val(pmd
) &= ~(_PAGE_PRESENT
| _PAGE_VALID
| _PAGE_DIRTY
);
571 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
572 * different prototype.
574 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
575 static inline pmd_t
pmdp_get_and_clear(struct mm_struct
*mm
,
576 unsigned long address
, pmd_t
*pmdp
)
585 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
587 #include <asm-generic/pgtable.h>
590 * uncached accelerated TLB map for video memory access
592 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
593 #define __HAVE_PHYS_MEM_ACCESS_PROT
596 pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long pfn
,
597 unsigned long size
, pgprot_t vma_prot
);
598 int phys_mem_access_prot_allowed(struct file
*file
, unsigned long pfn
,
599 unsigned long size
, pgprot_t
*vma_prot
);
603 * We provide our own get_unmapped area to cope with the virtual aliasing
604 * constraints placed on us by the cache architecture.
606 #define HAVE_ARCH_UNMAPPED_AREA
607 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
610 * No page table caches to initialise
612 #define pgtable_cache_init() do { } while (0)
614 #endif /* _ASM_PGTABLE_H */