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_huge_get_and_clear uses a version of pmd_clear() with a
572 * different prototype.
574 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
575 static inline pmd_t pmdp_huge_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 */